Some standard content:
J61 | | tt | | JB | Released on 11
Ministry of Machinery Industry of the People's Republic of China
Released
Implemented on 1996-10-01
JB/T505-1996
Foreword||tt| |This standard is a revision of JB/T505-93 based on JISB6611 "Intermittent Sand Mixer" and the latest relevant domestic and foreign information. The technical level is not lower than the technical indicators of foreign standards or products. When revising B505-93, the contents of the original standard that have been proven to be suitable for my country's conditions through practice are still retained. However, in the process of revising the original standard, according to the actual production situation, the noise of the original standard was divided into disc diameters and revised to the total power of the motor; the test method of service life and overload capacity and its test method were added; The molding sand formula of the original standard sand mixing performance is revised to the test process material formula, based on the molding sand compaction rate and measured according to the method specified in GB2684; the original standard is applicable to intermittent sand mixers and is expanded to apply to all clay sand mixers. sand machine, and added corresponding content: the sand mixing capacity of the original standard was revised to sand mixing specific energy, and the standard measurement unit was adopted; the original standard quoted B1644 "General Technical Conditions for Foundry Machinery". In order to facilitate the implementation of this standard, the revision The relevant content of JB1644 will be refined and incorporated into the content of this standard without direct reference. This standard will be implemented on October 1, 1996. From October 1, 1996, all clay sand mixers shall comply with the provisions of this standard.
This standard will replace JB505-93 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and administered by the National Foundry Machinery Standardization Technical Committee. This standard was drafted by: Jinan Foundry and Forging Machinery Research Institute, Qingdao Fourth Foundry Machinery Factory. The main drafters of this standard: Shi Daizeng and Wang Jianxiang. 1
1 Scope
Machine Industry Standard of the People's Republic of China
General Technical Conditions for Sticky Dry Sand Mixers
JB/T 5051996
This standard stipulates The technical requirements, test methods and inspection rules for clay sand sand mixers (hereinafter referred to as sand mixers) are specified. This standard applies to sand mixers.
Quoted standards
2
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB 191—90
GB 2684—81
GB 376683
GB/T 5226.1—1996
GB 6576—86wwW.bzxz.Net
GB 7932—87| |tt||GB 895988
GB 1009588
GB 11365—89
GB/T 13306—91
JB2670—82
JB/T 3000 —91
JB/T 5364—91
JB/T 5365.1—91
JB5545—91
JB/T 6331.2—92
ZB J38 001—87
ZB J50 006—88
ZB J50 014—89
3 Technical requirements
3.1 Design principles
Packaging, storage and transportation pictorial mark
Test methods for raw sand and mixtures used in castings
General technical conditions for hydraulic systems
Industrial machinery and electrical equipment Part 1: General technical conditions Machine tool lubrication system
General for pneumatic systems Technical conditions
Technical regulations for casting dust protection
Involute cylindrical gear accuracy
Bevel gears and hypoid gears
Accuracy
Plate||tt ||General rules for precision inspection of metal cutting machine tools
Method for formulating casting equipment models
Technical conditions for painting of sand treatment and cleaning equipment
Method for determination of cleanliness of casting machinery Gravimetric method Technical conditions for safety protection of casting machinery
Method for measuring noise of casting machinery Sound pressure level determination General technical conditions for cutting processing
Preparation of random technical documents for metal cutting machine tools Technical conditions for machine tool packaging
3.1.1 The structure of the sand mixer should be guaranteed Reasonable, beautiful appearance and improve the standardization level of sand mixer. 3.1.2 The complete set of sand mixer should be ensured, including electrical equipment, hydraulic and pneumatic components, special tools and anchor bolts, etc. 3.1.3
The usability of the sand mixer should be ensured, including the interchangeability of the wearing parts scraper, roller, liner and sand mixing rotor and the normal operation of the sand mixer. Ministry of Machinery Industry 1996-04- 11Approval
1996-10.01 Implementation
1
Random accessories used.
JB/T505—1996
3.1.4 The reliability, maintainability and durability of the sand mixer should be ensured. 3.1.5 It should be ensured that the sampling mechanism moves flexibly and sampling is smooth. 3.1.6 The model of the sand mixer should comply with the regulations of JB/T3000, and each production unit should apply for the model to the responsible unit in accordance with the regulations. 3.1.7 Sand mixer parameters should be implemented in accordance with relevant parameter standards and design technical documents. 3.2 The sand mixer shall comply with the provisions of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 3.3 The materials and purchased parts used in manufacturing the sand mixer should comply with current standards. 3.4 Safety and Hygiene
3.4.1 Safety measures should be taken for parts of the sand mixer that may endanger people or cause equipment damage. 3.4.2 The sand mixer should be equipped with safety devices that can ensure the personal safety of cleaning and maintenance personnel when working in the sand mixer. The safety protection should comply with the relevant provisions of JB5545,
3.4.3 Sand mixer There should be no abnormal impact or squealing sounds during operation. 3.4.4 When the sand mixer is running dry, the noise sound pressure level of a sand mixer with a total motor power of less than or equal to 37kW should not exceed 80dB (A); for a sand mixer with a total motor power of greater than 37kW~110kW, the noise level The pressure level should not exceed 85cB (A); for sand mixers with a total motor power greater than 110kW, the noise sound pressure level should not exceed 90dB (A). 3.4.5 The dust-proof facilities of the sand mixer shall be implemented in accordance with the provisions of GB8959 for process equipment and equipment sealing. 3.5 Hydraulic, pneumatic, and lubrication systems
3.5.1 Various pipes should not have defects such as dents, wrinkles, flattening, ruptures, etc. The bends of the pipelines should be smooth and the hoses should not be twisted. 3.5.2 The arrangement of pipelines should facilitate the use, adjustment and maintenance of hydraulic, pneumatic and lubrication systems. 3.5.3 When the sand mixer leaves the factory, the hydraulic, pneumatic and lubrication systems should not leak. 3.5.4 The lubricating parts of each bearing should be sealed reliably, and no dirt should enter the bearing. When grease is used, the dropping point temperature of the grease should not be lower than 85°C.
3.5.5 Other requirements for the hydraulic, pneumatic and lubrication systems of the sand mixer shall comply with the relevant regulations of GB3766, GB7932 and GB6576 respectively.
3.6 Electrical system
The electrical system shall comply with the relevant provisions of GB/T5226.1. 3.7 Processing quality
3.7.1 For parts whose technical documents do not indicate cutting processing requirements, their processing quality should comply with the regulations of ZBJ38001. 3.7.2 The transmission gear of the sand mixer should not be lower than the level 8 accuracy requirements in GB10095. 3.7.3 The bevel gear of the sand mixer should not be lower than the level 9 accuracy requirements in GB11365. 3.7.4 Surface hardness of main wearing parts
3.7.4.1 When the rolling rim is made of anti-wear white cast iron, its hardness shall not be less than 300HB, and the thickness of the condensation layer shall not be less than 7mm; when other materials are used, it shall comply with Technical documentation provisions. 3.7.4.2 It is recommended that the surface of the sand mixing rotor and the blade edge of the scraper be made of carbide inserts or tungsten carbide surfacing, with a hardness of not less than 50HRC. 3.8 Appearance quality
3.8.1 The appearance surface should not have bulges, depressions, roughness and other damages not specified in the drawings. 3.8.2 The exposed processing surface should be free from bumps, scratches and rust. 2
JB/T505—1996
3.8.3. The edges of the exposed joint surfaces of matching parts should be neat and even. Unless specified by the design, the general misalignment should not exceed the requirements in Table 1. Table 1
Combining surface edge side length dimensions
≤ 500
>500~1250
>1250-2500
>2500
Misalignment
2
3
4
5
3.8.4 The exposed weld should be smooth or uniform scaly corrugated, and the surface Welding slag should be cleaned and smoothed. mm | The end of the screw should expose 1 to 2 pitches of the nut. 3.8.6 The protective layer of electroplated, blue, black and other parts should be complete and should not fade, fall off or rust. 3.8.7 The exposed parts of various pipelines and lines should be compactly arranged, neatly arranged, and firmly fixed, and should not cause friction or collision with other parts.
3.8.8 The painting of the sand mixer should comply with the regulations of JB/T5364. 3.9 Assembly requirements
The assembly accuracy of the sand mixing mechanism should comply with the provisions of Appendix A (Standard Appendix). 3.9.1
3.9.2 The contact spots of the cylindrical gear pair and the bevel gear pair shall comply with the accuracy requirements of level 8 in GB10095 and level 9 in GB11365 respectively.
The cleanliness limit of the transmission system of the sand mixer shall not be greater than 0.03% of the lower limit of the oil standard by the weight of the lubricating oil. 3.9.3
Dry operation requirements
3.10
3.10.1 Each working mechanism and system of the sand mixer should be flexible and stable, and the sequence of manual, semi-automatic and automatic operations should be correct. . 3.10.2 The noise of the sand mixer shall comply with the provisions of 3.4.4 of this standard. 3.10.3 The rolling wheel should have good transcendence. 3.10.4 The temperature rise of rolling bearings shall not exceed 35°C, and the maximum temperature shall not exceed 70°C. 3.10.5 The idle running current of the main motor should not exceed 35% of the rated current. 3.11. Load operation requirements
3.11.1 The sand mixer should operate smoothly and flexibly under rated load operation, and there should be no sand leakage. Phenomenon. 3.11.2 The sand mixing performance indicators of the sand mixer should comply with the following regulations: a) The mixing time of roller sand mixer, roller rotor sand mixer, rotor sand mixer and balance wheel sand mixer is 25min and 1.5min respectively. Within the molding sand, the wet compressive strength growth rate of the molding sand should not be less than 95%; b) The uniformity rate of the molding sand performance of the continuous sand mixer should not exceed 5%: c) There should be no bentonite with a diameter exceeding 3mm in the mixed molding sand. group. 3.11.3 The sand mixer should have an overload capacity of not less than 10% of the rated feed capacity or productivity. 3.11.4 The sand mixing specific energy of the intermittent sand mixer should not be greater than 7.2x103J/kg. 3.11.5 The amount of residual sand in the intermittent sand mixer should not be greater than 2% of the rated feeding amount. 3.12 Service life requirements
3
JB/T 505—1996
3.12.1 The service life of the sand mixing rotor and scraper should not be less than 500h. 3.12.2 The first overhaul period of the sand mixer (subject to the replacement of the sand mixer transmission gear pair) should not be less than 12,000 hours. 4 Test method
4.1 Dry running test method
4.1.1 Round transcendence test method
Adjust the gap between the roller and the bottom lining plate to the specified minimum value, and put it in the sand mixer Place a log rod in the rolling plate with a diameter equal to the minimum gap value plus 20mm and a length equal to twice the diameter. After starting the sand mixer, the roller can flexibly pass over the wooden rod without impacting the bottom liner. 4.1.2 Noise test method
The noise of the sand mixer is measured according to the method specified in JB/T6331.2. 4.1.3 Bearing temperature rise test method
After continuous idle operation for 2 hours, use a point thermometer to immediately measure the maximum temperature of the bearing housing shell, and then add a 3°C correction value, which is the maximum temperature of the bearing, and the bearing temperature rise It is equal to the maximum bearing temperature minus the ambient temperature. 4.1.4 The no-load current test method of the main motor uses a measuring instrument with a measurement accuracy of not less than 2.5% to measure the motor current. 4.2 Load operation test method
Before the load test of the sand mixer, an idle operation test must be performed. 4.2.1 Test method for residual sand amount of intermittent sand mixer. After mixing is completed according to the specified time and the sand is unloaded according to the specified time, the residual molding sand in the rolling plate is cleaned and weighed. 4.2.2 Sand mixing performance test method of sand mixer 4.2.2.1 Sand mixing performance test method of intermittent sand mixer a) Test process material formula
The test process material formula is shown in Table 2.
Table 2
Process material name
Old sand
New sand
Bentonite
Pulverized coal
b) Water distribution Determination of ratio
Gage
Grid
Particle size group 21 (70/140)
Particle size group 21 (70/140)
Pairing| |tt||86%
10%
2%
2%
ratio
Mix the process materials for the test in any one Add water to the sand mixer to mix, and under the conditions that the compaction rate reaches (40±1)% and the wet compressive strength is not less than 100Pa, determine the ratio of the amount of water added to the test process materials, which is the ratio of the test process materials. water distribution ratio. ① Sampling method
According to the prescribed test process material formula, start the sand mixer, add the test process materials into the sand mixer to be tested, and mix. After adding new sand and old sand at one time, add the specified ratio at one time. Mix water for 0.5 minutes, then add bentonite and pulverized coal at one time, so that the sand mixer mixes at the rated feeding amount, and randomly take three sand samples every 0.5mn of mixing time. 4
Determination of molding sand properties
JB/T 505—1996
According to the method specified in GB2684, measure the wet compressive strength and compaction rate of each sand sample, and calculate respectively The average wet compressive strength and compaction rate of each sample are listed in Table 3.
Table 3
Mixing time, wet compressive strength, compaction rate
Mixing time min
Sand sample number
Wet compressive strength IPa||tt ||Compaction rate %
Average wet compressive strength of sand sample KPa
Average compaction rate of sand sample %
1
0.5
2|| tt||e) Determination of the growth rate of wet compressive strength of molding sand
3
4
1.0
5
6
28| |tt||5.0
29
30
Under the condition that the average wet pressure strength ring of the largest sand sample is less than 100kPa, calculate the molding sand of the intermittent sand mixer according to formula (1) Growth rate of wet compressive strength:
48
In the formula: △S-Sand mixer molding sand Wet compressive strength growth rate: S
d
x100%|| tt||(1
s°) The mixing time of rotor and balance wheel sand mixer, roller and roller rotor sand mixer is respectively within 1.5min and 25min, and the compaction rate is not less than 39%. The maximum average wet compressive strength of the sand sample, kPa; S - the maximum average wet compressive strength of the sand sample with a compaction rate of 39% at a mixing time of 5.0mim, kPa
4.2.2.2 Test method for sand mixing performance uniformity of continuous sand mixer a) The process materials used for the test
shall be based on the process material formula given in 4.22.1. b) Determination of water distribution ratio
is measured according to the water distribution ratio given in 4.22.1. ) Sampling method
Mix the molding sand according to the specified parameters and methods. After the sand mixer works normally, take a sand sample every 15 seconds and take 10 sand samples continuously. ① Determination of molding sand performance
According to the method specified in GB2684, measure the compaction rate, wet compressive strength and air permeability of each sand sample, and calculate the average wet compressive strength, compaction rate and air permeability respectively .
Determination of uniformity
The uniformity of various properties of the molding sand of the continuous sand mixer is calculated according to formula (2), and its maximum E is the uniformity of the performance of the continuous sand mixer. A×100%
E=
A
In the formula: E - a certain performance uniformity of the molding sand of the continuous sand mixer; A - a certain performance of the molding sand of 10 sand samples Average performance of each item: (2)
5
JB/T505—1996
A'—the average of a certain performance of the molding sand of 10 sand samples is the same as that of any sand sample. The maximum absolute value of the difference between item performance. 4.2.3 Overload capacity test method
Mix the molding sand with the rated feeding amount or 110% of the productivity, and use the power measuring system (the system error including the measurement record is not more than 5%) to measure the unloading of each motor. The maximum load power should not exceed the rated power of the motor, and the transmission system and sand mixing mechanism should be stable and flexible.
4.2.4 Intermittent sand mixer sand mixing specific energy test method Under the condition that the sand mixing performance reaches 3.11.2, mix molding sand with a wet compressive strength of not less than 100kPa and a compaction rate of not less than 39% , calculated according to formula (3):
H,=3.6×10°PT/G.
where: H, - sand mixing specific energy of intermittent sand mixer, J/kg; G—rated feeding amount, kg;
P maximum total power of load, kW;
T—mixing period, h.
4.3 Service life test method
4.3.1 First overhaul period test method
Subject to the replacement of the transmission gear pair of the sand mixer, but there should be no less than two user certificates . 4.3.2 Test method for service life of sand mixing rotor and scraper a) Test method (arbitration type)
·(3)
Use a sand mixer to install the scraper and scraper that have passed the inspection The sand mixing rotor can be mixed with rated feed amount or production rate under specified conditions (dry sand can be used), and its service life should meet the requirements. b) Statistical method
According to the actual operation records of the user (required to be no less than two sand mixers), but the change in the rated feeding amount or productivity must not exceed ±10% to determine the scraper and sand mixer The service life of the rotor. c) Parts inspection method
The hardness of the surface of the sand mixer rotor and the scraper blade is not less than 50HRC, the thickness of the surfacing layer is not less than 2.0mm, and the surfacing size in the direction of the liner angle is not less than 10mm (scraper).
4.4 Determination of cleanliness of sand mixer
The cleanliness is measured according to the method of JB/T5365.1. 4.5 Determination of the assembly accuracy of the sand mixing mechanism
The assembly accuracy of the sand mixing mechanism is measured according to the method in Appendix A (standard appendix). 5 Inspection Rules
5.1 Factory Inspection
5.1.1 Each sand mixer must be inspected by the quality inspection department of the manufacturer and must be accompanied by a product quality certificate before leaving the factory. 5.1.2 The inspection results of 3.9.1, 3.10.1, and 3.10.4 should be indicated in the quality certificate. 5.1.3 The inspection results of other items may not be indicated in the certificate of conformity. 5.1.4 All routine inspection items must be qualified. During sampling inspection, the sampling quantity is 2% of each batch, but not less than one unit. If unqualified items are found during sampling inspection 6
JB/T505
5-1996
, then double the quantity will be inspected. If there are still unqualified items, the batch of products will not be accepted. (Standard appendix)
5.1.5
5 Factory inspection items are as follows:
a) Conventional items: 3.4, 3.5.3, 3.5.5, 3.8.4, 3.8. 7, 3.8.8, 3.9.1, 3.10 and 6.1; b) Sampling inspection items: 3.6, 3.9.2 and 3.11. 5.2 Type inspection
5.2.1 Type inspection shall be carried out when one of the following circumstances occurs: a ) Trial prototype identification of new products or old products transferred to factory production; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, it is conducted every three years; ) has been suspended for more than one year and normal production is resumed; e) when the factory inspection results are significantly different from the last type inspection results; f) when the national quality supervision agency proposes type inspection requirements. 2. Random sampling is implemented for type inspection. The sampling base shall not be less than 2% except for new product identification, and the sampling quantity shall not be less than one unit. 5.2.2
5.2.3
Type inspection items are all items specified in this standard. 5.2.4
Type inspection items should all be qualified.
5 logo, packaging, storage and transportation
6
6.1
6.2
6.3
6.4
each mixing The sand machine should have a product label fixed at a conspicuous position, and the label should comply with the regulations of GB/T13306. The packaging of the sand mixer should comply with the regulations of ZBJ50014. The storage and transportation icons of the sand mixer should comply with the relevant regulations of GB191. The sand mixer should be shipped with the following technical documents, and the preparation of the random technical documents should comply with the regulations of ZBJ50006. a) Instruction manual;
b) Certificate of conformity:
c) Packing list.
6.5 The transportation of sand mixer should comply with the current relevant regulations on railway, road, waterway transportation and mechanized loading Appendix A
7
4
Each sand mixer should have a product label fixed in a conspicuous position, and the label should comply with the regulations of GB/T13306. The packaging of the sand mixer should comply with the regulations of ZBJ50014. The storage and transportation icons of the sand mixer should comply with the relevant regulations of GB191. The sand mixer should be shipped with the following technical documents, and the preparation of the random technical documents should comply with the regulations of ZBJ50006. a) Instruction manual;
b) Certificate of conformity:
c) Packing list.
6.5 The transportation of sand mixer should comply with the current relevant regulations on railway, road, waterway transportation and mechanized loading Appendix A
7
4
Each sand mixer should have a product label fixed in a conspicuous position, and the label should comply with the regulations of GB/T13306. The packaging of the sand mixer should comply with the regulations of ZBJ50014. The storage and transportation icons of the sand mixer should comply with the relevant regulations of GB191. The sand mixer should be shipped with the following technical documents, and the preparation of the random technical documents should comply with the regulations of ZBJ50006. a) Instruction manual;
b) Certificate of conformity:
c) Packing list.
6.5 The transportation of sand mixer should comply with the current relevant regulations on railway, road, waterway transportation and mechanized loading Appendix A
7
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