JB/T 4311.3-1991 Indirect resistance furnace RT series trolley type resistance furnace
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T4311.3-1991
Indirect Resistance Furnace
RT Series Trolley Type Resistance Furnace
Published on 1991-06-28
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
Indirect Resistance Furnace
RT Series Trolley Type Resistance Furnace
JB/T4311.3-1991
Replaces JB4311.3-1987
This standard specifies the requirements for RT series trolley type resistance furnace products (hereinafter referred to as trolley furnaces), including varieties, specifications and technical performance, as well as ordering and supply.
This standard applies to natural atmosphere trolley-type resistance furnaces designed according to the requirements of Articles 4.1, 5.1 and 5.2, mainly for annealing, normalizing and stress relief of metal materials.
This standard also applies to similar trolley-type resistance furnaces, and different parts may be specified separately. Referenced standards
GB10067.1 Basic technical conditions for electric heating equipment Part 1 GB10067.4
Basic technical conditions for electric heating equipment Part 4 GB10066.1
Test methods for electric heating equipment Part 1
GB10066.4
Test methods for electric heating equipment Part 4
ZBK60001
Product model compilation method for electric heating equipment
3 Terms
According to the provisions of Chapter 3 of GB10066.4.
4 Product classification
4.1 Varieties and specifications
General part
Indirect resistance furnace
General part
Indirect resistance furnace
4.1.1 Trolley furnaces are divided into multiple varieties according to the maximum working temperature, as shown in Table 1. Table 1
Maximum working temperature,
Other maximum working temperature values are allowed in the enterprise product standards. In this case, the numbers in the variety code (maximum working temperature divided by 100, without decimals) should be changed accordingly.
4.1.2 Each variety of trolley furnace is divided into multiple specifications according to the size of the working area. The size of the working area should comply with the following regulations. The position of the working area in the furnace should be indicated on the attached drawing in the trolley furnace product manual. The working area dimensions (width × length × height) of the trolley furnace newly designed or modified after the release of this standard shall comply with the following specifications 4.1.2.12
Minimum specification: 450mm×900mm×450mm Approved by the Ministry of Machinery and Electronics Industry on June 28, 1991 and implemented on July 1, 1992
JB/T4311.3-1991
Other specifications: length increases by 300mm, width and height increase by 150mm. 4.1.2.2 The three specifications of RT9 trolley furnaces listed in Table 2 can be retained for use. Table 2
Working area dimensions
4.1.3 Each trolley furnace manufacturer can choose from the varieties and specifications specified in Articles 4.1.1 and 4.1.2 and formulate their own trolley furnace enterprise product standards accordingly.
4.2 Model
The model of the trolley furnace should be compiled according to ZBK60001. The technical level code shall be determined according to Article 7.4 of this standard. Main parameters
In the enterprise product standards, the following items should be listed separately for each model of trolley furnace: a.
Power supply voltage, V,
Power supply frequency, Hz;
Number of phases;
Rated power, kW,
Number of temperature control zones;
Connection method of heating elements;
Working temperature, ℃,
Working zone size, mm;
Maximum loading capacity, kg;
Heating capacity, kg/h (see Article 5.3.3) Empty furnace heating time, h
Furnace temperature uniformity ℃;
Furnace temperature stability, ℃
Empty furnace loss, kW,
Surface temperature rise, K,
Empty furnace energy consumption, kW.h;
Furnace body weight, t,
Furnace body overall dimensions, mm.
For trolley furnaces with non-metallic heating elements, the working voltage should be listed separately. Technical requirements
General requirements
Trolley furnaces should comply with the provisions of Chapter 5 of GB10067.4. When there is a difference between the provisions of this standard and this standard, this standard shall prevail. 5.2 Supplementary requirements for design and manufacturing
5.2.1 Overall design
Trolley furnaces are mainly composed of furnace body, tracks and control cabinets. 2
JB/T4311.3-1991
The furnace body is a horizontal structure, mainly composed of two parts: the furnace body and the trolley. The trolley has wheels and can be dragged away from the furnace body along the track to load and unload the charge. Trolley furnaces with a maximum operating temperature not exceeding 750°C should be equipped with fans to force convection heating of the charge. When the heating element is required to be set in another area that does not directly radiate the working area, and then the fan blows the hot air into the furnace chamber, it can be proposed according to Article 9.2. The trolley furnace with a maximum working temperature exceeding 750℃ should also be equipped with a fan when necessary to increase the heating speed and meet the furnace temperature uniformity requirements. 5.2.2 Furnace body
The furnace body consists of furnace light, door, furnace lining, heating elements and air circulation system. 5.2.2.1 Furnace shell
The furnace shell is welded by steel and steel plates, except for some parts that must be assembled and connected with bolts on site. The entire furnace shell should have sufficient strength and rigidity. Fasteners that penetrate the furnace lining should be used as little as possible on the inner wall of the furnace shell. The furnace door frame or furnace panel where the furnace door opening is located should be made of materials with small thermal deformation, and its structure should be able to avoid warping. If necessary, the part that is radiated by heat when the furnace door is lifted should be water-cooled. 5.2.2.2 Furnace lining
For trolley furnaces with a maximum operating temperature below 600℃, it is recommended to use aluminized steel plates or stainless steel plates with a thickness of not less than 2mm as lining in the furnace shell, and fill the space between the outer wall of the furnace shell and the inner lining with mineral wool, refractory fiber or similar non-powdering, non-hardening block insulation materials. Other types of trolley furnaces only use refractory insulation materials as linings. Among them, the lining of Class C furnaces, except for the load-bearing and collision-prone parts, is made of refractory fiber.
The material and structure of the lining should meet the requirements for the performance of the trolley (see Article 5.3). The overhaul period of the lining should comply with the provisions of Table 3.
Furnace lining type
Steel plate lining or brick boron lining
Refractory fiber lining
Overhaul period
5.2.2.3 Heating elements
The design and fixation of heating elements shall meet the heating requirements of the trolley furnace. The elements shall be firmly installed and shall not be displaced or loosened under normal working conditions.
Trolley furnaces with a maximum operating temperature not exceeding 1200℃ shall use metal heating elements. For those exceeding 1200℃, heating elements made of silicon carbide or other suitable materials may be used. When silicon carbide elements are used, a multi-tap transformer or other voltage regulating device with not less than 8 taps shall be equipped. The service life of the heating element is limited to the input power of the trolley furnace at the rated power supply voltage (or for trolley furnaces using silicon carbide elements, at the highest operating voltage) being 15% less than the rated power, and shall comply with the provisions of Table 4. Table 4
Trolley furnace maximum operating temperature 0.
～750
>750~1000
>1000~1200
Service life of heating element
5.2.2.4 Furnace door
Unless otherwise required (see Article 9.2), for trolley furnaces with a working area width of 900mm or less, it is recommended to use manual vertical lifting 3
JB/T 4311.3 -1991
type. For furnace doors exceeding 900mm, it is recommended to use power-driven vertical lifting type. Manual furnace doors should have balancing weights and mechanical guide devices; the force to lift the furnace door should not exceed 180N. When the furnace door is closed, the furnace door should be evenly sealed with the furnace door frame (or furnace panel) and the trolley. The furnace door should preferably be made of refractory fiber, or the same refractory insulation material as the furnace wall, so that the surface temperature of the furnace door can meet the requirements of Article 5.3.6. When the furnace door is in the open position, the furnace inlet size should not be less than the corresponding size of the working area specified for the trolley furnace of this specification. If necessary, the furnace door should be able to be locked after opening.
For trolley furnaces with a maximum operating temperature exceeding 750°C, there should be a sealed observation hole on the furnace door. 5.2.2.5 Air circulation system
In order to achieve the specified furnace temperature uniformity and increase the heating speed, the furnace design should be in accordance with Section 5.2.1. Equipped with necessary air ducts, baffles, adjustable air guides, heat shields, exhaust holes, circulating fans and their control devices. The fan should be interlocked with the heating power supply so that the heating power supply can be automatically cut off when the fan fails. Heating parts such as fan blades should be made of heat-resistant steel. Bearings and seals should be reliably cooled.
The fan should be calibrated by dynamic balancing test. The service life of heating metal parts such as fan blades should be not less than one year. 5.2.3 Trolley
The trolley is mainly composed of chassis, refractory insulation layer, furnace bed and wheels made of steel. The wheels should be equipped with bearings. The trolley is automatically guided on the track and can move freely when empty or fully loaded, cold or hot. The chassis of the trolley is made of steel plate and reinforced with steel sections. A refractory insulation layer is provided on the bottom plate. Its material and thickness should be able to carry the specified weight of furnace charge and protect the metal structural parts of the trolley from deformation due to furnace temperature. The furnace bed shall be made into pier type, perforated plate type or other types when necessary to facilitate uniform distribution of load and circulation of hot air. For Class A, Class B and Class C furnaces, the furnace bed shall not produce deformation that hinders normal use within the service life of two years, three years and four years respectively. The working height of the trolley, that is, the height from the track surface to the charging surface of the trolley shall not exceed 1000mm. Special circumstances shall be agreed upon by the supplier and the buyer (see Article 9.2).
The trolley shall have a mechanical positioning structure and shall be able to hit a rigid support and stop automatically after entering the furnace body so as to align the position and ensure the sealing and safety of the furnace.
A seal shall be added along the entire periphery between the bottom of the trolley and the inner wall of the furnace body. The sealing layer may be made of refractory fiber, or sand seal or a sealing structure required by the buyer (see Article 9.2). The sealing structure shall be able to minimize the heat loss of the furnace and ensure the uniformity of the furnace temperature. When there are regulations or requirements (see Article 9.2), the trolley shall be equipped with a full set of electric drive systems and soft start control systems to drive the trolley in and out of the furnace body.
The trolley shall be interlocked with the furnace door and, if necessary, with the lower sealing device. The trolley can only move after the furnace door is opened and the lower sealing device is disengaged.
5.2.4 Tracks
Unless otherwise required (see Article 9.2), for furnaces assembled and shipped from the manufacturer, the tracks shall be designed to be laid directly on the ground, and for furnaces assembled on site, the tracks shall be designed to not protrude from the ground. The length of the track outside the furnace shall ensure that the distance between the trolley and the furnace body is at least 1.2m. When there are other requirements for the length of the track and its layout, they may be proposed in accordance with Article 9.2. 5.2.5 Measurement, control and recording
The measurement, control and recording of trolley furnaces shall comply with Article 5.2.7 of GB10067.4 and the following supplementary provisions. 5.2.5.1 Thermocouple
Unless otherwise required (see Article 9.2), the length of the thermocouple lead wire or compensation wire of the trolley furnace assembled and shipped from the manufacturer shall not be less than 15m.
5.2.5.2 Temperature instrument
The control type of the temperature control instrument of the trolley furnace shall generally be the time proportion type that controls the contactor through the intermediate relay system, or other technically more advanced types. For Class A trolley furnaces, it is allowed to retain the position control. For Class C furnaces, a microprocessor digital display temperature control instrument with a temperature setting accuracy of not less than 0.5% and a resolution of not less than 1°C shall be equipped. The digital height shall not be less than 15mm. The instrument shall be equipped with an external socket for connecting a recorder or printer. The effective width or diameter of the recording paper of the furnace temperature recorder shall not be less than 150mm. When a printer is required to replace the recorder, it can be requested according to Article 9.2.
5.3 Performance requirements
The performance of the trolley furnace shall comply with Article 5.3 of GB10067.4 and the following requirements. 5.3.1 Working temperature
The working temperature of the trolley furnace shall comply with the provisions of Table 5. Table 5
Maximum working temperature8.
>350~500
>500~750
200~6.
3008.
Within the working temperature range, the trolley furnace shall meet the furnace temperature uniformity and furnace temperature stability requirements of Articles 5.3.4 and 5.3.5. 5.3.2 Maximum loading capacity
Unless otherwise required (see Article 9.2), when the working area volume V of the trolley furnace is not greater than 3m\, its maximum loading capacity shall be specified in the enterprise product standard according to the requirements of Table 6.
Maximum working temperature 9.
≤750
>750~1000
>1000~1200
3500×V
3200×V
2700×V
2400xV
Maximum loading capacity≥
4000×V
3600xV
1200×V
When V is greater than 3m* or when heating other materials, the maximum loading capacity of the trolley furnace shall be specified in the enterprise product standard or agreed upon by the supply and demand parties.
5.3.3 Heating capacity
The heating capacity of the trolley furnace shall comply with the provisions of item a or item b below. The purchaser shall select which provision to adopt (see Article 9.2). a. At a certain furnace temperature, a trolley is used to load cold furnace charges of a certain material and weight. The furnace temperature should be able to rise to the test temperature within a certain period of time. The furnace temperature, material, charge amount, heating time and test temperature during the above loading shall be agreed upon by the supplier and the purchaser. b. When the bottom area S of the working area does not exceed 4m\, the heating capacity of the trolley furnace shall be specified in the enterprise product standard according to the requirements of Table 7. When S exceeds 4m\, the heating capacity value shall be agreed upon by the supplier and the purchaser. 5
Maximum operating temperature.
≤1000
>1000~1200
5.3.4Furnace temperature uniformity
JB/T4311.3-1991
350×s
300×s
The furnace temperature uniformity of the trolley furnace shall not exceed the range specified in Table 8.
500×s
Maximum working temperature
≤750
>750~1200
5.3.5 Furnace temperature stability
The furnace temperature stability of the trolley furnace shall not exceed the following specified range: Grade A furnace
Grade B furnace
Grade C furnace
± 10 ℃
±4℃
± 1℃
5.3.6 Surface temperature rise
150×s
Furnace temperature stability
Test temperature
The thermal stability of the trolley furnace at the maximum working temperature, the surface temperature rise of the furnace shell and the furnace door shall comply with the provisions of Table 9. The surface temperature rise of the operating handle or hand wheel shall not exceed 25K.
Working temperature
≤1000
>1000~1200
5.3.7 Empty furnace heating time
Unless otherwise required (see Article 9.2), the empty furnace heating time of the trolley furnace shall comply with the provisions of Table 10. Table 10
Maximum working temperature 9.
《750
Working area volume V
>0.75~1.50
>1.50~3.00
Empty furnace heating time
Maximum working temperature 9.
>750~950
JB/T4311.3 -1991
Continued Table 10
Working area volume V
>0.75~1.50
>1.50~3.00
>0.75~1.50
>1.50~3.00
Empty furnace heating time
When the working area volume is greater than 3m*, the empty furnace heating time is specified in the enterprise product standard or agreed upon by the supply and demand parties. 6
5.3.8 Empty furnace loss
The empty furnace loss of the following specifications of trolley furnaces shall comply with the provisions of Table 11. The remaining specifications shall comply with the provisions of the enterprise product standards. Table 11
Product code
5.3.9 Empty furnace energy consumption
Working area size
Empty furnace loss《
The empty furnace energy consumption of the following specifications of trolley furnaces shall comply with the provisions of Table 12, and the remaining specifications shall comply with the provisions of the enterprise product standards. Table 12
Product code
5.3.10 Noise
Working area size
For trolley furnaces equipped with fans, the noise in the working area shall comply with the provisions of relevant standards. mm
Furnace energy consumption《
5.3.11 Others
The performance of other aspects of the trolley furnace shall comply with Article 5.2 of this standard, as well as the corresponding provisions in the enterprise product standards and supply contracts.
5.4 Complete set requirements
5.4.1 The complete set supply scope of the trolley furnace specified by the supplier shall be listed in the enterprise product standards, which shall mainly include the following trolley furnace body (including furnace body and trolley), a.
Control cabinet:
c. Temperature instrument,
d. Thermocouple;
e. Compensation wire,
f. Track and its accessories;
JB/T 4311.3 -1991
9. Spare parts;
h. "Product manual", including necessary drawings. The above items may be supplemented as necessary in the enterprise product standards, and the specific contents of each item shall be listed, including model, specification and number plate.
If the party has different requirements for the items specified by the supplier, it can be proposed in accordance with Article 9.2. 5.4.2 When the following instruments are required to be provided, they can be proposed in accordance with Article 9.2. The necessary technical requirements shall be agreed upon by the supply and demand parties. a. Electric energy meter and (or) other measuring instruments; b. Program controller.
6 Test method
The test of trolley furnace shall be carried out in accordance with the corresponding provisions of GB10066.1 and GB10066.4 and the following supplementary provisions. If necessary, it shall be supplemented in the enterprise product standard.
6.1 Measurement of furnace temperature uniformity and furnace temperature stability For trolley furnaces with a maximum operating temperature not exceeding 1200℃, the test temperatures are the minimum operating temperature and the maximum operating temperature respectively. For trolley furnaces with a maximum operating temperature exceeding 1200℃, the test temperatures are the minimum operating temperature and 1200℃ respectively. For trolley furnaces with multiple temperature control zones, the set temperature of each zone shall be the same, and the arithmetic mean of the temperatures measured at the temperature control points of each zone shall be used as the benchmark to determine the furnace temperature uniformity.
6.2 Measurement of surface temperature rise
The position of the measuring point is stipulated as follows:
The measuring point shall be at any point on the outer surface of the furnace, furnace door, operating handle, etc., except near the furnace mouth, and within 75mm from the edge of the metal heating element and thermocouple lead hole and the center of the furnace lining penetrating fastener, and 90mm from the edge of the non-metallic heating element lead hole and observation hole.
It shall be measured with a surface thermometer with an accuracy of not less than Class 5, and a glass thermometer shall not be used. 6.3 Heating capacity test
a. Direct method
Applies to the provisions of Item a of Article 5.3.3 of this standard. When the trolley furnace stabilizes at a certain temperature, the trolley is dragged away from the furnace body and loaded with cold furnace charges of a certain material and weight. After loading, the trolley is pushed back into the furnace body, the furnace door is closed, and the power is turned on for heating. Record the rising process of the furnace temperature. The furnace temperature should be able to rise to the test temperature within a certain period of time. The furnace temperature, material, charge weight, heating time and test temperature during charging shall be in accordance with the agreement between the supplier and the buyer.
b. The indirect method
is applicable to the provisions of Article 5.3.3, Item b of this standard. When the following formula is established, the trolley furnace is considered to have sufficient heating capacity; t.(P.-P.)≥G·△H
In the formula, P. —- the actual measured value of the rated power of the trolley furnace, kW; P. — the actual measured value of the empty furnace loss of the trolley furnace, kW, t, the time for calculating the heating capacity is set as 1h; G.-the weight of the charge specified in the enterprise product standard or agreed upon by the supplier and the buyer, Kg: △H-—the increase in heat when the charge is heated from the initial temperature (taking the reference ambient temperature of 20℃) to the test temperature of the trolley furnace (see Table 7), kW·h/kg.
6.4 Charging and running test
JB/T4311.3-1991
Unless otherwise arranged by the manufacturer, the charging and running test shall be carried out at the user's site. The material, shape, size and placement of the charge shall be agreed upon by the parties. The charge shall be provided by the user.
Load a batch of charge equal to the maximum loading amount into the furnace and run it at the maximum operating temperature for more than 8 hours in total. Then stop the furnace and inspect it according to Article 7.2.8 of GB10066.1. Inspection rules and classification
The inspection and classification of trolley furnaces shall be carried out in accordance with Chapter 7 and the following articles of GB310067.1. The factory inspection items of trolley furnaces shall include the following items: 7.1
a. General inspection, safety inspection; durability test of label writing; inspection of furnace overall size and working area size, inspection of furnace lining quality; inspection of heating element manufacturing quality, measurement of cold DC resistance of metal heating element; inspection of heating element short circuit to furnace shell, measurement of insulation resistance (applicable to trolley furnace for baking before leaving the factory); insulation withstand voltage test (applicable to trolley furnace for baking before leaving the factory); calibration of temperature instrument; cold inspection of movement mechanism operation or action; inspection of interlock alarm system; inspection of water, gas and hydraulic systems (when these systems are available); inspection of accessories, including inspection of model, specification and factory certificate of conformity; scope of supply, including inspection of completeness of factory technical documents; packaging inspection.
2 The type inspection items of trolley furnace should include the following: 7.2
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Noise measurement (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a loading operation test should be carried out; 9
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d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 104.2 When the following instruments are required, they may be requested in accordance with Article 9.2. Necessary technical requirements shall be agreed upon by both parties. a. Electricity meter and (or) other measuring instruments; b. Program controller.
6 Test method
The test of the trolley furnace shall be carried out in accordance with the corresponding provisions of GB10066.1 and GB10066.4 and the following supplementary provisions. If necessary, it shall be supplemented in the enterprise product standard.
6.1 Measurement of furnace temperature uniformity and furnace temperature stability For trolley furnaces with a maximum operating temperature not exceeding 1200℃, the test temperatures are the minimum operating temperature and the maximum operating temperature respectively. For trolley furnaces with a maximum operating temperature exceeding 1200℃, the test temperatures are the minimum operating temperature and 1200℃ respectively. For trolley furnaces with multiple temperature control zones, the set temperature of each zone shall be the same, and the arithmetic mean of the temperatures measured at the temperature control points of each zone shall be used as the basis to determine the furnace temperature uniformity.
6.2 Measurement of surface temperature rise
The position of the measuring point is stipulated as follows:
The measuring point shall be at any point on the outer surface of the furnace, furnace door, operating handle, etc., except near the furnace mouth, and within 75mm from the edge of the metal heating element and thermocouple lead hole and the center of the furnace lining penetrating fastener, and 90mm from the edge of the non-metallic heating element lead hole and observation hole.
It shall be measured with a surface thermometer with an accuracy of not less than Class 5, and a glass thermometer shall not be used. 6.3 Heating capacity test
a. Direct method
Applies to the provisions of Item a of Article 5.3.3 of this standard. When the trolley furnace stabilizes at a certain temperature, the trolley is dragged away from the furnace body and loaded with cold furnace charges of a certain material and weight. After loading, the trolley is pushed back into the furnace body, the furnace door is closed, and the power is turned on for heating. Record the rising process of the furnace temperature. The furnace temperature should be able to rise to the test temperature within a certain period of time. The furnace temperature, material, charge weight, heating time and test temperature during charging shall be in accordance with the agreement between the supplier and the buyer.
b. The indirect method
is applicable to the provisions of Article 5.3.3, Item b of this standard. When the following formula is established, the trolley furnace is considered to have sufficient heating capacity; t.(P.-P.)≥G·△H
In the formula, P. —- the actual measured value of the rated power of the trolley furnace, kW; P. — the actual measured value of the empty furnace loss of the trolley furnace, kW, t, the time for calculating the heating capacity is set as 1h; G.-the weight of the charge specified in the enterprise product standard or agreed upon by the supplier and the buyer, Kg: △H-—the increase in heat when the charge is heated from the initial temperature (taking the reference ambient temperature of 20℃) to the test temperature of the trolley furnace (see Table 7), kW·h/kg.
6.4 Charging and running test
JB/T4311.3-1991
Unless otherwise arranged by the manufacturer, the charging and running test shall be carried out at the user's site. The material, shape, size and placement of the charge shall be agreed upon by the parties. The charge shall be provided by the user.
Load a batch of charge equal to the maximum loading amount into the furnace and run it at the maximum operating temperature for more than 8 hours in total. Then stop the furnace and inspect it according to Article 7.2.8 of GB10066.1. Inspection rules and classification
The inspection and classification of trolley furnaces shall be carried out in accordance with Chapter 7 and the following articles of GB310067.1. The factory inspection items of trolley furnaces shall include the following items: 7.1
a. General inspection, safety inspection; durability test of label writing; inspection of furnace overall size and working area size, inspection of furnace lining quality; inspection of heating element manufacturing quality, measurement of cold DC resistance of metal heating element; inspection of heating element short circuit to furnace shell, measurement of insulation resistance (applicable to trolley furnace for baking before leaving the factory); insulation withstand voltage test (applicable to trolley furnace for baking before leaving the factory); calibration of temperature instrument; cold inspection of movement mechanism operation or action; inspection of interlock alarm system; inspection of water, gas and hydraulic systems (when these systems are available); inspection of accessories, including inspection of model, specification and factory certificate; scope of supply, including inspection of completeness of factory technical documents; packaging inspection.
2 The type inspection items of trolley furnace should include the following: 7.2
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;www.bzxz.net
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Noise measurement (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a loading operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 104.2 When the following instruments are required, they may be requested in accordance with Article 9.2. Necessary technical requirements shall be agreed upon by both parties. a. Electricity meter and (or) other measuring instruments; b. Program controller.
6 Test method
The test of the trolley furnace shall be carried out in accordance with the corresponding provisions of GB10066.1 and GB10066.4 and the following supplementary provisions. If necessary, it shall be supplemented in the enterprise product standard.
6.1 Measurement of furnace temperature uniformity and furnace temperature stability For trolley furnaces with a maximum operating temperature not exceeding 1200℃, the test temperatures are the minimum operating temperature and the maximum operating temperature respectively. For trolley furnaces with a maximum operating temperature exceeding 1200℃, the test temperatures are the minimum operating temperature and 1200℃ respectively. For trolley furnaces with multiple temperature control zones, the set temperature of each zone shall be the same, and the arithmetic mean of the temperatures measured at the temperature control points of each zone shall be used as the basis to determine the furnace temperature uniformity.
6.2 Measurement of surface temperature rise
The position of the measuring point is stipulated as follows:
The measuring point shall be at any point on the outer surface of the furnace, furnace door, operating handle, etc., except near the furnace mouth, and within 75mm from the edge of the lead-out hole of the metal heating element and thermocouple and the center of the fastener penetrating the furnace lining, and 90mm from the edge of the lead-out hole of the non-metallic heating element and the observation hole.
It shall be measured with a surface thermometer with an accuracy of not less than Class 5, and a glass thermometer shall not be used. 6.3 Heating capacity test
a. Direct method
Applies to the provisions of Item a of Article 5.3.3 of this standard. When the trolley furnace stabilizes at a certain temperature, the trolley is dragged away from the furnace body and loaded with cold furnace charges of a certain material and weight. After loading, the trolley is pushed back into the furnace body, the furnace door is closed, and the heating is powered on. Record the rising process of the furnace temperature. The furnace temperature should be able to rise to the test temperature within a certain period of time. The furnace temperature, material, charge weight, heating time and test temperature during charging shall be in accordance with the agreement between the supplier and the buyer.
b. The indirect method
is applicable to the provisions of Article 5.3.3, Item b of this standard. When the following formula is established, the trolley furnace is considered to have sufficient heating capacity; t.(P.-P.)≥G·△H
In the formula, P. —- the measured value of the rated power of the trolley furnace, kW; P. — the measured value of the empty furnace loss of the trolley furnace, kW, t, the time for calculating the heating capacity is set as 1h; G.-the weight of the charge specified in the enterprise product standard or agreed upon by the supplier and the buyer, Kg: △H-—the increase in heat when the charge is heated from the initial temperature (taking the reference ambient temperature of 20℃) to the test temperature of the trolley furnace (see Table 7), kW·h/kg.
6.4 Charging and running test
JB/T4311.3-1991
Unless otherwise arranged by the manufacturer, the charging and running test shall be carried out at the user's site. The material, shape, size and placement of the charge shall be agreed upon by the parties. The charge shall be provided by the user.
Load a batch of charge equal to the maximum loading amount into the furnace and run it at the maximum operating temperature for more than 8 hours in total. Then stop the furnace and inspect it according to Article 7.2.8 of GB10066.1. Inspection rules and classification
The inspection and classification of trolley furnaces shall be carried out in accordance with Chapter 7 and the following articles of GB310067.1. The factory inspection items of trolley furnaces shall include the following items: 7.1
a. General inspection, safety inspection; durability test of label writing; inspection of furnace overall size and working area size, inspection of furnace lining quality; inspection of heating element manufacturing quality, measurement of cold DC resistance of metal heating element; inspection of heating element short circuit to furnace shell, measurement of insulation resistance (applicable to trolley furnace for baking before leaving the factory); insulation withstand voltage test (applicable to trolley furnace for baking before leaving the factory); calibration of temperature instrument; cold inspection of movement mechanism operation or action; inspection of interlock alarm system; inspection of water, gas and hydraulic systems (when these systems are available); inspection of accessories, including inspection of model, specification and factory certificate of conformity; scope of supply, including inspection of completeness of factory technical documents; packaging inspection.
2 The type inspection items of trolley furnace should include the following: 7.2
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Noise measurement (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a loading operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or the compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 103.3.3.a. When the trolley furnace is stable at a certain temperature, the trolley is pulled away from the furnace body and loaded with cold furnace charge of a certain material and weight. After loading, push the trolley back into the furnace body, close the furnace door, and turn on the power for heating. Record the rising process of the furnace temperature. The furnace temperature should be able to rise to the test temperature within a certain period of time. When loading, the furnace temperature, material, charge weight, heating time and test temperature shall be agreed upon by the supply and demand parties.
b. The indirect method
is applicable to the provisions of Article 5.3.3.b of this standard. When the following formula is established, the trolley furnace is considered to have sufficient heating capacity; t.(P.-P.)≥G·△H
Where, P. —-The measured value of the rated power of the trolley furnace, kW; P. --The measured value of the empty furnace loss of the trolley furnace, kW, t, the time for calculating the heating capacity, set as 1h; G.-The weight of the charge specified in the enterprise product standard or agreed upon by the supply and demand parties, Kg: △H-—When the charge is heated from the initial temperature (the reference ambient temperature is 20℃) to the test temperature of the trolley furnace (see Table 7), its heat increase, kW·h/kg.
6.4 Loading and running test
JB/T4311.3-1991
Unless otherwise arranged by the manufacturer, the loading and running test is carried out at the user's site. The material, shape, size and placement of the charge are agreed upon by the parties. The charge is provided by the user.
A batch of charge with a weight equal to the maximum loading amount is loaded into the furnace, and it is operated at the highest working temperature for more than 8 hours cumulatively. Then the furnace is stopped and inspected according to Article 7.2.8 of GB10066.1. Inspection rules and classification
The inspection and classification of trolley furnaces shall be carried out in accordance with Chapter 7 of GB310067.1 and the following clauses. The factory inspection items of trolley furnaces shall include the following items:7.1
a. General inspection, safety inspection; durability test of label writing; inspection of furnace overall size and working area size, inspection of furnace lining quality; inspection of heating element manufacturing quality, measurement of cold DC resistance of metal heating element; inspection of heating element short circuit to furnace shell, measurement of insulation resistance (applicable to trolley furnace for baking before leaving the factory); insulation withstand voltage test (applicable to trolley furnace for baking before leaving the factory); calibration of temperature instrument; cold inspection of movement mechanism operation or action; inspection of interlock alarm system; inspection of water, gas and hydraulic systems (when these systems are available); inspection of accessories, including inspection of model, specification and factory certificate; scope of supply, including inspection of completeness of factory technical documents; packaging inspection.
2 The type inspection items of trolley furnace should include the following: 7.2
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Noise measurement (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a loading operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 103.3.3.a. When the trolley furnace is stable at a certain temperature, the trolley is pulled away from the furnace body and loaded with cold furnace charge of a certain material and weight. After loading, push the trolley back into the furnace body, close the furnace door, and turn on the power for heating. Record the rising process of the furnace temperature. The furnace temperature should be able to rise to the test temperature within a certain period of time. When loading, the furnace temperature, material, charge weight, heating time and test temperature shall be agreed upon by the supply and demand parties.
b. The indirect method
is applicable to the provisions of Article 5.3.3.b of this standard. When the following formula is established, the trolley furnace is considered to have sufficient heating capacity; t.(P.-P.)≥G·△H
Where, P. —-The measured value of the rated power of the trolley furnace, kW; P. --The measured value of the empty furnace loss of the trolley furnace, kW, t, the time for calculating the heating capacity, set as 1h; G.-The weight of the charge specified in the enterprise product standard or agreed upon by the supply and demand parties, Kg: △H-—When the charge is heated from the initial temperature (the reference ambient temperature is 20℃) to the test temperature of the trolley furnace (see Table 7), its heat increase, kW·h/kg.
6.4 Loading and running test
JB/T4311.3-1991
Unless otherwise arranged by the manufacturer, the loading and running test is carried out at the user's site. The material, shape, size and placement of the charge are agreed upon by the parties. The charge is provided by the user.
A batch of charge with a weight equal to the maximum loading amount is loaded into the furnace, and it is operated at the highest working temperature for more than 8 hours cumulatively. Then the furnace is stopped and inspected according to Article 7.2.8 of GB10066.1. Inspection rules and classification
The inspection and classification of trolley furnaces shall be carried out in accordance with Chapter 7 of GB310067.1 and the following clauses. The factory inspection items of trolley furnaces shall include the following items:7.1
a. General inspection, safety inspection; durability test of label writing; inspection of furnace overall size and working area size, inspection of furnace lining quality; inspection of heating element manufacturing quality, measurement of cold DC resistance of metal heating element; inspection of heating element short circuit to furnace shell, measurement of insulation resistance (applicable to trolley furnace for baking before leaving the factory); insulation withstand voltage test (applicable to trolley furnace for baking before leaving the factory); calibration of temperature instrument; cold inspection of movement mechanism operation or action; inspection of interlock alarm system; inspection of water, gas and hydraulic systems (when these systems are available); inspection of accessories, including inspection of model, specification and factory certificate; scope of supply, including inspection of completeness of factory technical documents; packaging inspection.
2 The type inspection items of trolley furnace should include the following: 7.2
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Noise measurement (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a loading operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 102
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Measurement of noise (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a charging operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an electric drive system (see Article 5.2.3); different requirements for the length and layout of the track (see Article 5.2.4); different requirements for the length of the thermocouple lead wire or compensation wire (see Article 5.2.5.1), different requirements for the maximum load (see Article 5.3.2); requirements for heating capacity (see Article 5.3.3); different requirements for the empty furnace heating time (see Article 5.3.7); different requirements for the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of electric energy meters and (or) other measuring instruments (see Article 5.4.2 item a), requirements for the provision of program controllers (see Article 5.4.2 item b); requirements for loading operation tests (see Article 7.2). X
The supplier should meet the special requirements of the purchaser as much as possible. However, the special requirements that can be selected by the purchaser shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supplier and the purchaser when ordering. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Jiang Congji and Cao Wenxiu. 102
All factory inspection items (under type inspection conditions), circuit test;
Measurement of empty furnace heating time;
Measurement of rated power;
Measurement of maximum working temperature;
Measurement of empty furnace loss,
Measurement of empty furnace energy consumption,
Measurement of furnace temperature uniformity;
Measurement of furnace temperature stability;
Measurement of surface temperature rise;
Heating capacity test;
Measurement of noise (applicable to trolley furnace equipped with fan) m.
Hot inspection of the operation or action of the motion mechanism; Inspection after hot test.
When required (see Article 9.2), a charging operation test should be carried out; 9
JB/T4311.3-1991
d. Different requirements for painting (see Article 5.2.7 of GB10067.1) e, special requirements for packaging (see Article 8.2.5 of GB10067.1) f. Different requirements for power supply (see Article 5.2.2 of GB10067.4); different requirements for temperature instrument types, etc. (see Articles 5.2.7.3 and 5.2.7.6 of GB10067.4, and Article 5.2.5.2g.
of this standard);
is not required to provide an over-temperature controller (see Article 5.2.7.7 of GB10067.4); h.
requires a cumulative timer (see Article 5.2.7.10 of GB10067.4); i.
requires the control cabinet (station) to have a vibration absorption device (see Article 5.2.7.12 of GB10067.4); requires the heating element to be set in another area separated from the working area (see Article 5.2.1); different requirements for the opening and closing type and mechanism of the furnace door (see Article 5.2.2.4); m.||t t||Different requirements for the working height of the trolley (see Article 5.2.3), requirements for the sealing structure (see Article 5.2.3); requirements for the trolley to be equipped with an ele
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