Some standard content:
Mechanical Industry Standard of the People's Republic of China "Air Plasma Arc Cutting Machine
1 Subject Content and Scope of Application
JB/T 7438-94
This standard specifies the classification, basic parameters, operating conditions, technical requirements, safety, data tolerance, test items and methods, acceptance rules, warranty period and labels, signs and packaging of air plasma arc cutting machines. This standard applies to various types of air plasma arc cutting machines (hereinafter referred to as cutting machines) under general use conditions. It is the basis for the formulation of standards for various types of cutting machines. If there are additional requirements or special requirements not specified in this standard, additional or special provisions should be made in the product standards of this type of cutting machine.
2 Reference Standards
GB2423.3 Basic Environmental Test Procedures for Electrical and Electronic Products Test Ca: Constant Heat Test Method GB2423.4 Basic Environmental Test Procedures for Electrical and Electronic Products Test Db: Alternating Humid Heat Test Method Safety Requirements for Arc Welding Equipment Welding Cable Plugs, Sockets and Couplers GB 7945
GB 8118
General technical conditions for arc welding machines
GB10249 Method for compiling welding machine models
ZBJ59002.4 Thermal cutting, plasma arc cutting, quality and dimensional deviationsZBJ64003 Arc welding rectifier
ZBJ64022 Technical conditions for arc starting devices
JB/DQ4169 Technical conditions for cooling fans for welding machines3 Product classification and basic parameters
3.1 Cutting machines are divided into four types according to the operation mode: manual, semi-automatic, automatic and manual and automatic dual-purpose cutting machines; according to the cooling mode, they are divided into water cooling, air cooling and water-air combined cutting machines There are three types of cooling. 3.2 The model compilation method of the cutting machine shall comply with the relevant provisions of GB10249. 3.3 When the rated cutting current level of the cutting machine is stipulated to be above 100A, it shall be classified according to the R10 priority number system. If it is below 100A, it can be classified according to the R5 priority number system: 1625, 40, 63, 100, 125, 160, 200, 250, 315A. There is no regulation for those above 315A, which shall be agreed upon by the manufacturer and the user. 3.4 The basic parameters of the cutting machine shall comply with the provisions of Table 1 and Table 2. Table 1
Parameter name
Parameter value
Parameter name
Parameter value
Parameter name
Parameter value
Power supply voltage, V
220,380
Control power supply voltage, V
220,380
Specified duty cycle
60%100%
Note: 1) Does not include short-circuit arc starting method.
Cut rate, Hz
Starting current, A
Calculate cutting cycle, min
1994-09-06 Approved by the Ministry of Machinery Industry of the People's Republic of China 586
10, continuous
cutting Cutting power supply external characteristics
DC drop characteristics
Cutting thickness.mm
Equal to or greater than the rated value
Arc striking device power supply voltage, V
24.36,421\
1995-07-01 Selling
Rated cutting current, A
Power supply no-load voltage is not less than, V
Compressed air supply method
JB/T7438
Bottle, pipeline, air compressor
Note: The provisions of Table 1 and Table 2 do not include inverter power supplies and power supplies using other electronic technologies. Use conditions
The working environment of the cutting machine should comply with the provisions of Chapter 3 of GB8118. 5 Technical requirements
5.1 The cutting machine should work normally under the conditions of actual sinusoidal power supply voltage and the following power supply quality of the power grid: three-phase voltage unbalance rate is less than 0.5%;
power grid voltage fluctuation is ±10%;
frequency fluctuation is ±2%.
5.2 Temperature rise limit
5.2.1 The temperature rise limit of the winding shall be in accordance with the provisions of Table 3, and the maximum ambient air temperature is 40℃. Table 3
Mixed rise limit of winding (including reactor and saturated reactor) Insulation grade temperature limit,
A(105)
E(120)
B(130)
F(155)
H(180)
Thermometer method
5.2.2 The temperature rise of the metal part in contact with the insulation should not exceed the temperature rise limit allowed by the insulator. 5.2.3 The temperature rise limit of the rectifier element shall comply with the relevant standards. 250
Resistance method
5.2.4 The temperature rise limit of the hottest point accessible to the clamping or hand-held part of the torch shall not be greater than the temperature rise of other parts, and shall not exceed the use temperature of the material.
5.3 The accuracy of the current or voltage scale indication shall be within ±10% of the scale value. If an ammeter or voltmeter is installed, its accuracy shall not be lower than Class 2.5.
5.4 The power supply shall have a certain load and short-term overload and impulse overvoltage adaptation capabilities. 5.4.1 Load capacity
Under rated input voltage and rated frequency, adjust to the maximum cutting current or maximum load voltage position, run for 10 minutes, then make the output short-circuit for 2 seconds each time, then open for 3 seconds, repeat on and off 60 times, and its external resistance is 0.008~0.010. 5.4.2 Overload capacity
Under the condition of the maximum allowable grid voltage fluctuation, adjust the power supply to the maximum cutting current or maximum load voltage position, then short-circuit the output end for 2 seconds, and the external circuit resistance is within the range of 0.008~~0.010, and no electrical or mechanical failure should occur. For power supplies with overload protection, the overload protection should operate normally.
5.4.3 Impact overvoltage
Not greater than the maximum reverse voltage allowed by the rectifier element, and no breakdown occurs. 587
JB/T7438—94
5.5 The efficiency of various types of cutting machines is specified by the product standards of various types of cutting pillows. 5.6 The no-load current of the main transformer of the cutting machine should not be greater than 10% of the rated primary current. 5.7 The cutting machine should be equipped with an air filter regulator or a gas flow meter. The pressure regulating range and flow rate of the air filter regulator must meet the requirements of the cutting process. The oil or water is well separated from the air, safe and reliable. The pressure regulating error shall not exceed ±0.1MPa, and the flow meter range must meet the flow rate requirements of the cutting process.
5.8 The cooling system (including the cutting torch) should ensure normal operation at the rated working pressure without leakage. 5.9 The gas system (including the cutting torch) should ensure normal operation at the rated working intake pressure without leakage, and ensure sufficient gas supply. 5.70 In the power supply of the forced ventilation cooling cutting machine, the fan used should comply with the provisions of JB/DQ4169, and the installation should be stable and reliable. 5.11 The power supply part of the cutting machine should meet the requirements of GB2423.4. The cutting torch part should meet the requirements of GB2423.3. After two cycles of testing, the insulation resistance and dielectric strength should be able to withstand 70% of the specified value assessment. 5.12 For semi-automatic and automatic cutting machines, under the condition of allowable grid voltage and frequency fluctuations, the change in the walking speed of the cutting torch should not exceed ±5%.
5.13 The cutting torch electrode should be coaxial with the nozzle, and the coaxiality error should not exceed 10% of the nozzle diameter. 5.14 When the cutting torch is matched with the corresponding power supply, it should be ensured that it starts within the time specified by the arc ignition device of the cutting machine, and the arc is easy to ignite. 5.5 The cables and pipes of the cutting torch should be collectively covered with protective sleeves (collectively referred to as cable Dong), and the length of the protective sleeve should be slightly shorter than the cable. The length of the cable bundle should not be less than 5m and meet the requirements of the working length. It should be soft, durable, have sufficient strength, and be able to prevent sparks and damage caused by grease and solvents.
5.16 All parts of the cutting machine must be inspected and qualified, and purchased and outsourced parts must have a certificate of qualification before they can be assembled. 5.17 The paint layer of the cutting machine should be smooth and flat, with uniform thickness, and should not have defects such as scratches, bubbles, flow marks, particles and paint leakage. 6 Safety
6.1 The cutting machine should be equipped with a power on/off switch. 6.2 The input and output circuits of the cutting machine power supply should be separated. 6.3 When the load duration rate corresponding to the maximum cutting current is less than 60%, the cutting machine power supply should be equipped with a thermal protection device. The thermal protection device should be able to reliably cut off the power supply when the winding temperature rise reaches more than 80% of the temperature rise limit specified in Table 3. 6.4 The input and output ends of the cutting machine power supply should be reliably insulated, and protective measures should be taken to prevent accidental contact with the human body. 6.5 The minimum protection level of the cutting machine housing is IP21. Except for the necessary anti-interference device or protective capacitor, the plasma cutting circuit shall not be connected to the protective grounding frame. The effective value of the additional leakage current through these components shall not exceed 5mA. 6.6 When the cutting machine power supply is short-circuited or overloaded, the protection device shall be able to cut off the network power supply. 6.7 Before the cutting machine is started or when the cutting stops, the cutting circuit should have no current output, and the no-load voltage of the semi-automatic or automatic cutting machine should be automatically cut off.
6.8 The no-load voltage limit shall not exceed the peak value of DC 710V, and the voltage between the external nozzle and the workpiece or ground that may be in contact shall not exceed the peak value of DC 68V.
6.9 The selection of the arc ignition device shall comply with the provisions of ZBJ64022. The arc ignition circuit shall be isolated from the inside of the cutting machine, and the arc ignition device shall be automatically cut off after the arc is established.
6.10 If the cooling water (gas) and air are not connected, the flow is insufficient or the water (gas) is cut off in the middle, the cutting machine cannot be started or should stop working immediately. 6.11 Wrap the cutting torch cable bundle once. When the bending diameter is 5 times the cable diameter, the flow change of gas and cooling water should not exceed 10%.
6.12 Insulation resistance
The insulation resistance between the conductive parts of the cutting machine shall not be lower than the resistance listed in Table 4 without water cooling. 588
Between primary and secondary circuits
Between primary circuit and frame
Between secondary circuit and frame
JB/T 7438-94
Between control circuit and frame and all other circuitsBetween the insulating surface and conductor of the cutting torch
Between the primary and secondary circuits of the step-up transformer and output transformer in the ignition device6.13 Dielectric strength
Insulation resistance
The dielectric strength between the conductive parts of the cutting machine shall not be lower than the test voltage values listed in Table 5 without water cooling. Table 5
Test voltage
Between primary and secondary circuits
Between primary circuit and frame
Between secondary circuit and frame
Between control circuit and primary circuit
Between control circuit and secondary circuit
Supply above 50V and below 127V Between control circuit and frame Supply below 50V Between primary circuit of step-up transformer in booster device and ground Between primary circuit of step-up transformer and soft circuit Between secondary circuit of step-up transformer and ground
Between insulator surface of cutting torch and conductor
Note: ①The above voltage values are all AC effective values. Rated input voltage 220
②When the control circuit is electrically connected with the primary circuit or secondary circuit, the control circuit may not be subject to dielectric strength assessment alone. 6.14
Rated input
voltage 380
The inter-turn dielectric strength test of the transformer winding of the cutting machine power supply shall be able to withstand 50Hz, 130% rated input voltage, and last for 5 minutes. After the moisture resistance and drip resistance test, the inter-turn dielectric strength shall also be evaluated according to the above provisions. The test can also be carried out at double frequency and double voltage, and last for 1 minute. The power supply of the cutting machine shall have the electrical clearance and creepage distance required for sufficient dielectric strength, and its value shall not be lower than the provisions of Table 6. 6.15
Rated voltage
Note: 1
Electrical clearance, mm
Small power supply installed in air-conditioning and clean room 『-V
Creep distance, mm
Power supply installed in general residences, shops, offices, laboratories, and test sites is used for indoor power supply in factories, workshops, etc. for general industry, agriculture, and handicrafts, and IV is used for outdoor power supply in general industry, agriculture, etc. 589
JB/T 7438—94
6.16 The start button of the cutting machine is often in contact with the human body, and the voltage shall not exceed the following values: AC 36V or 42V
36V or 48V
6.17 The connection and wiring of the internal electrical circuits of the cutting machine shall be fixed, reliable and neat, and easy to repair. During the entire service life, no faults such as broken wires and loosening shall occur.
6.18 The cutting machine shall have a good grounding device. The terminal of the grounding wire shall not be used for other purposes. Generally, it shall not have electrical contact with the three-phase neutral line. The diameter of the grounding bolt shall not be less than 8mm. 7 Data tolerance
7.1 The deviation between the air-cut voltage and the value indicated on the label shall not exceed ±5%, nor shall it be lower than the air-cut voltage limit value. 7.2 The cutting thickness shall be equal to or greater than the value indicated on the label. 7.3 The deviation between the primary input current and the value indicated on the label shall not exceed ±10%. 7.4 When the cutting current is at the minimum and maximum values, the deviation from the value indicated on the nameplate shall not exceed the following values: minimum cutting current + 10%
Maximum cutting current: 5%
The calculation method is as follows:
Where: - Deviation value
I2 Cutting current measured value, A;
I Cutting current value indicated on the nameplate, A.
7.5 Cutting test error
Carry out cutting test using the cutting process test parameters provided by the manufacturer, and compare the data marked on the nameplate or manual. The cutting thickness deviation shall not exceed 5%, and the cutting speed deviation shall not exceed -5%. 8 Test items and methods
8.1 Instrument accuracy and load resistance selection
Ammeter, voltmeter and power meter 0.5 level: Thermometer ±0.5℃;
Load resistance, power factor greater than 0.99. For rectified currents with a ripple factor greater than 10%, use an AC effective value ammeter to measure the root mean square value; for rectified currents with a ripple factor less than 10%, use a DC ammeter to measure the average value. 8.2 Routine test and type test
8.2.1 Routine test is a test conducted after each cutting machine is manufactured to determine whether it meets certain requirements in the standard. At this time, it is allowed to use 1.0-level electrical measuring instruments, and the megohmmeter is not less than 2.5 levels. 8.2.2 Type test is to select a representative cutting machine of the same model for comprehensive performance test to determine whether it meets the requirements of the standard.
Type test shall be conducted for each of the following cases, with no less than two units each time: #,
New cutting machine to be trial-produced;
Major changes in the design, process and materials used of the cutting machine; When the cutting machine that has been out of production for more than one year is produced again; The conventional test results of the cutting machine have an unacceptable deviation from the previous type test results: Regular sampling shall be conducted for batch production, no less than once every two years. 8.3 Appearance inspection
JB/T 7438—94
Before the test, the paint layer, assembly quality and handling and hoisting parts of the cutting machine (the support wheel should be firm and light, and the hoisting ring should be able to withstand more than 2.5 times the weight of the cutting machine) shall be inspected. When the above factors do not affect the test results of the electrical performance, the various tests in the standard can be carried out.
8.4 Temperature rise
The temperature rise shall comply with the provisions of Article 5.2.
8.5 Determination of current indication accuracy
The current indication accuracy shall be calculated according to formula (2) and shall comply with the provisions of Article 5.3. Current indication accuracy = indication value (measured value (A) ×100% indication value (A)
8.6 Load capacity, overload capacity and adaptability to impulse overvoltage 8.6.1 Load capacity shall comply with the provisions of Article 5.4.1. 8.6.2 Overload capacity shall comply with the provisions of Article 5.4.2. (2)
8:6.3 In impulse overvoltage test, when no-load, the primary is connected to 110% rated input voltage and continuously switched on and off 30 times, which shall comply with the provisions of Article 5.4.3.
8.7· The efficiency shall be measured after the temperature rise test and shall comply with the provisions of Article 5.5. 8.8 No-load current
The no-load current measurement in the routine test is allowed to be carried out in the cold state, and the no-load current measurement in the type test shall be carried out in the temperature rise equilibrium state. The measured no-load current value shall take its arithmetic mean as the actual no-load current value of the power supply. The no-load current percentage is calculated according to formula (3):||tt ||1o×100%
Where: Ion-——no-load current at rated output, A, IiN——input current at rated output, A.
The measurement result shall comply with the provisions of Article 5.6.
8.9 Determination of no-load voltage
8.9.1 Effective value: Under the condition that the impedance of the external plasma arc cutting circuit is 5±5%k, use a level effective value meter to measure. 8.9.2 Peak value: Use the circuit shown in Figure 1 for measurement. 1ko
Figure 1 Peak value measurement
(3)
Note: The voltmeter indicates the average value, and the accuracy should reach ±1% of the full scale. The selected range should be as close to the actual value of the no-load voltage as possible. The voltmeter should have an internal resistance of at least 1M2, and the tolerance of the parameter values of each component in the measurement circuit shall not exceed ±5%. When measuring, the potentiometer should vary between 0 and 5k0 to obtain a peak value within 0.2 ～5.2k negative, change polarity and repeat the measurement. The measurement results shall meet the requirements of 3.4 and 6.8. 8.10 Water cooling system and gas system sealing test: 1.5 times the rated water pressure is passed into the water cooling system for 1 minute. The test is carried out with the water outlet blocked and shall meet the requirements of 5.8.591Www.bzxZ.net
.
JB/T 7438-94
Apply soapy water to all joints in the gas system, and pass compressed air 1.5 times the rated value into the gas path for 1 minute. The test is carried out when the cutting torch hose is blocked, and shall comply with the provisions of Article 5.9. 8.11 Moisture resistance test
shall comply with the provisions of Article 5.11.
8.12 Semi-automatic and automatic cutting machine operation test shall comply with the provisions of Article 5.12.
8.13 Nozzle and electrode coaxiality measurement
Use a standard mandrel instead of an electrode for measurement, and the measurement point is located at the nozzle outlet or the center point of electrode burnout is used for measurement. High-frequency discharge spark detection can be used for routine testing, and the distribution of the discharge spark along the circumference should be greater than half the circumference of the nozzle hole. The measurement results shall comply with the requirements of Article 5.13. 8.14 Arc striking performance test
Clamp the cutting torch on a height-adjustable device, lay a flat steel plate as the cutting test piece, adjust it to the working height, use the rated maximum cutting current (or torch rated current) and rated minimum cutting current of the matching power supply, strike the arc 20 times respectively (each arc striking should be carried out after the electric plate is cooled), the success rate is not less than 80%, and it should meet the requirements of Article 5.14. 8.15 Thermal protection test
The thermal protection test can be carried out through the temperature rise test. Within the current adjustment range specified by the cutting machine, the thermal protection device should not trip. When the overload is achieved by increasing the input voltage of the cutting machine power supply, short-circuiting the cutting machine power supply or limiting the cooling of the cutting machine power supply, it should trip immediately. The thermal protection device should be able to be continuously switched on and off 100 times and meet the requirements of Article 6.3. 8.16 Leakage current measurement
The additional leakage current of the cutting circuit through the anti-interference device or protective capacitor and other components shall be measured with a DC ammeter with an accuracy of 0.5 and shall comply with the provisions of Article 6.5.
8.17 Insulation resistance measurement
The insulation resistance of the winding to the casing and between them shall be measured before the dielectric strength test. At room temperature, a 500V DC voltage is applied to measure the insulation resistance of each part of the cutting machine and last for 1 minute. It shall comply with the resistance value specified in Table 4. During the measurement, the rectifier element and its protective device may be short-circuited.
8.18 Dielectric strength test
After the temperature rise test, the dielectric strength test shall be carried out immediately. During the test, an actual sinusoidal voltage with a frequency of 50Hz is applied. The test voltage at the beginning of the grid shall not exceed half of the voltage value specified in Table 5, and then rise to the full value within 10s and last for 1min; the voltage is quickly reduced before cutting off. When tested with a 10mA current, no sparking or breakdown shall occur. This test shall not be repeated. If a special situation requires re-testing, 80% of the standard test voltage should be used as the test voltage for repeated testing. During routine testing, the voltage value specified in Table 5 is used, and the duration is 5s. During the test, the rectifier and its protection device can be short-circuited. For the electronic components of the auxiliary and control circuits or some components that cannot withstand the corresponding test voltage, they can be short-circuited or removed during the test. For the lines that will cause an open circuit when removed, short-circuit protection should be adopted. 8.19 Dielectric strength test
During type testing, this test should be carried out in a hot state. During routine testing, it is allowed to be carried out in a cold state. Test according to the provisions of Article 6.14, and after 5 minutes, reduce the power supply to a value close to the rated value and cut off the power supply, and observe whether the insulation of each part of the winding is damaged. 8.20 Static external characteristic measurement
should be carried out at the maximum cutting current, minimum cutting current, and rated cutting current. When the maximum cutting current is equal to the rated cutting current, it is also necessary to measure at the 50% rated cutting current position. The input voltage and frequency should be kept at the rated value during measurement. Adjust the negative cutting resistance so that its output end changes from no-load to short circuit, and the reading should be no less than 8 points. Record the output voltage and current at each position, and draw the static external characteristic curve accordingly.
8.21 Cutting test
JB/T7438-94
At the two positions of maximum cutting current and minimum cutting current, cut the maximum thickness and minimum thickness of carbon steel 1m long at the corresponding cutting speed, and the cutting quality should meet the requirements of ZB159002.4. The arc striking, arc turning and cutting process should be normal and smooth. 9 Acceptance rules
9.1 Before the cutting machine leaves the factory, routine tests or type tests should be carried out. The test items shall be in accordance with the standards. Only qualified ones can leave the factory. 9.2According to the agreement with the user, the following conditions can be applied for acceptance: the manufacturer shall provide the user with a copy of the test report of the cutting machine; a.
Acceptance shall be conducted in the manufacturing plant and the user may be present to supervise; acceptance shall be conducted at the installation site designated by the user: various data tolerances and performances shall be checked or sampled. 9.3If one of the indicators in the test or acceptance fails, double the number of samples may be sampled for re-inspection. If there is still one indicator that fails, the cutting machine shall be deemed unqualified.
10 Warranty period
If the user uses and stores the cutting machine correctly in accordance with the provisions of the manufacturer's instruction manual, the manufacturer shall ensure that the cutting machine can operate well within one year of use (within a period not exceeding 18 months from the date of shipment). Within this specified period, if the cutting machine is damaged or fails to work properly due to manufacturing quality, the manufacturer shall repair or replace (parts or cutting machine) for the user free of charge.
11 Labels, signs, and packaging
11.1 The label should indicate the following:
Manufacturer name, registered trademark;
Standard code and equivalent international standard code (if there is an international standard code), cutting machine model;
Factory number:
Enclosure protection grade;
Weight;
Shape of external characteristic curve;
Cutting thickness range;
Current adjustment range (including corresponding load voltage): no-load voltage;
Input circuit connection method;
Primary input voltage and frequency,
Rated input capacity;
Air pressure.
11.2 Marking
Note;
On the current indicator dial, the area where the cutting current exceeds the rated value should be marked with the word "overload" to avoid overload danger. The output of the cutting machine, the input cable connector, the water pipe, the air pipe inlet and outlet should be permanently marked during use; the rotation direction of the cooling fan should be clearly marked; near the grounding bolt, there should be a symbol indicating grounding. d.
11.3 Packaging
11.3.1 The cutting machine (including accessories and spare parts) should be protected and fixed when packed, and have rainproof measures to meet the needs of open-air storage and 593
transportation.
The technical documents accompanying the cutting machine packaging are: packing list,
factory certificate;
instruction manual.
Additional Notes:
JB/T7438-94
This standard was proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lin Chaoyong and Meng Zhaoguang. 59417 Insulation resistance measurement
The insulation resistance of the winding to the housing and between them should be measured before the dielectric strength test. At room temperature, apply 500V DC voltage to measure the insulation resistance of each part of the cutting machine and last for 1 minute. It should meet the resistance value specified in Table 4. During the measurement, the rectifier element and its protective device can be short-circuited.
8.18 Dielectric strength test
After the temperature rise test, the dielectric strength test shall be carried out immediately. During the test, apply an actual sine wave voltage with a frequency of 50Hz. The test voltage of the gate at the beginning shall not exceed half of the voltage value specified in Table 5, and then rise to the full value within 10s and last for 1min; before cutting off, the voltage shall be quickly reduced. When the test is tested with a current of 10mA, no sparking or breakdown shall occur. This test shall not be repeated. If it is necessary to repeat the test due to special circumstances, 80% of the standard test voltage shall be used as the test voltage for the repeated test. During the routine test, the voltage value specified in Table 5 shall be used and the duration shall be 5s. During the test, the rectifier and its protection device may be short-circuited. For the electronic components of the auxiliary and control circuits or some components that cannot withstand the corresponding test voltage, they may be short-circuited or removed during the test. For the lines that will cause an open circuit due to removal, short-circuit protection should be adopted. 8.19 Dielectric Strength Test
During the type test, the test should be carried out in a hot state. During the routine test, it is allowed to be carried out in a cold state. Test according to the provisions of Article 6.14, reduce to a value close to the rated value after 5 minutes, cut off the power supply, and observe whether the insulation of each part of the winding is damaged. 8.20 Static external characteristic measurement
should be carried out at the maximum cutting current, minimum cutting current, and rated cutting current. When the maximum cutting current is equal to the rated cutting current, it is also necessary to measure at the position of 50% of the rated cutting current. The input voltage and frequency should be kept at the rated value during the measurement. Adjust the negative cutting resistance so that its output end is from no-load to short circuit, and the reading should be no less than 8 points. Record the output voltage and current at each position, and draw the static external characteristic curve accordingly.
8.21 Cutting test
JB/T7438—94
At the two positions of maximum cutting current and minimum cutting current, the maximum thickness and minimum thickness of carbon steel 1m long should be cut with the corresponding cutting speed, and the cutting quality should meet the requirements of ZB159002.4. The arc striking, arc turning and cutting process should be normal and smooth. 9 Acceptance rules
9.1 Before the cutting machine leaves the factory, routine tests or type tests should be carried out. The test items shall be in accordance with the standards. Only qualified ones can leave the factory. 9.2 According to the agreement with the user, the acceptance can be carried out according to the following conditions: the manufacturer provides the user with a copy of the cutting machine test report; a.
The acceptance is carried out in the manufacturing area, and the user can supervise on site; the acceptance is carried out at the installation site specified by the user: the tolerance and performance of each data are checked or sampled. 9.3 If one of the indicators fails during the test or acceptance, double the number of samples can be re-tested. If one of the indicators still fails, the cutting machine is considered unqualified.
10 Warranty period
If the user uses and stores the cutting machine correctly according to the manufacturer's instructions, the manufacturer shall ensure that the cutting machine can operate well within one year (no more than 18 months from the date of shipment). Within this specified period, if the cutting machine is damaged or cannot work normally due to manufacturing quality, the manufacturer shall repair or replace (parts or cutting machine) for the user free of charge.
11 Labels, signs, and packaging
11.1 The following contents should be marked on the label:
Manufacturer name, registered trademark;
Standard code and equivalent international standard code (if there is an international standard code), cutting machine model;
Factory number:
Enclosure protection grade;
Weight;
Shape of external characteristic curve;
Cutting thickness range;
Current adjustment range (including corresponding load voltage): no-load voltage;
Input circuit connection method;
Primary input voltage and frequency,
Rated input capacity;
Air pressure.
11.2 Marking
Note;
On the current indicator dial, the area where the cutting current exceeds the rated value should be marked with the word "overload" to avoid overload danger. The output of the cutting machine, the input cable connector, the water pipe, the air pipe inlet and outlet should be permanently marked during use; the rotation direction of the cooling fan should be clearly marked; near the grounding bolt, there should be a symbol indicating grounding. d.
11.3 Packaging
11.3.1 The cutting machine (including accessories and spare parts) should be protected and fixed when packed, and have rainproof measures to meet the needs of open-air storage and 593
transportation.
The technical documents accompanying the cutting machine packaging are: packing list,
factory certificate;
instruction manual.
Additional Notes:
JB/T7438-94
This standard was proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lin Chaoyong and Meng Zhaoguang. 59417 Insulation resistance measurement
The insulation resistance of the winding to the housing and between them should be measured before the dielectric strength test. At room temperature, apply 500V DC voltage to measure the insulation resistance of each part of the cutting machine and last for 1 minute. It should meet the resistance value specified in Table 4. During the measurement, the rectifier element and its protective device can be short-circuited.
8.18 Dielectric strength test
After the temperature rise test, the dielectric strength test shall be carried out immediately. During the test, apply an actual sine wave voltage with a frequency of 50Hz. The test voltage of the gate at the beginning shall not exceed half of the voltage value specified in Table 5, and then rise to the full value within 10s and last for 1min; before cutting off, the voltage shall be quickly reduced. When the test is tested with a current of 10mA, no sparking or breakdown shall occur. This test shall not be repeated. If it is necessary to repeat the test due to special circumstances, 80% of the standard test voltage shall be used as the test voltage for the repeated test. During the routine test, the voltage value specified in Table 5 shall be used and the duration shall be 5s. During the test, the rectifier and its protection device may be short-circuited. For the electronic components of the auxiliary and control circuits or some components that cannot withstand the corresponding test voltage, they may be short-circuited or removed during the test. For the lines that will cause an open circuit due to removal, short-circuit protection should be adopted. 8.19 Dielectric Strength Test
During the type test, the test should be carried out in a hot state. During the routine test, it is allowed to be carried out in a cold state. Test according to the provisions of Article 6.14, reduce to a value close to the rated value after 5 minutes, cut off the power supply, and observe whether the insulation of each part of the winding is damaged. 8.20 Static external characteristic measurement
should be carried out at the maximum cutting current, minimum cutting current, and rated cutting current. When the maximum cutting current is equal to the rated cutting current, it is also necessary to measure at the position of 50% of the rated cutting current. The input voltage and frequency should be kept at the rated value during the measurement. Adjust the negative cutting resistance so that its output end is from no-load to short circuit, and the reading should be no less than 8 points. Record the output voltage and current at each position, and draw the static external characteristic curve accordingly.
8.21 Cutting test
JB/T7438—94
At the two positions of maximum cutting current and minimum cutting current, the maximum thickness and minimum thickness of carbon steel 1m long should be cut with the corresponding cutting speed, and the cutting quality should meet the requirements of ZB159002.4. The arc striking, arc turning and cutting process should be normal and smooth. 9 Acceptance rules
9.1 Before the cutting machine leaves the factory, routine tests or type tests should be carried out. The test items shall be in accordance with the standards. Only qualified ones can leave the factory. 9.2 According to the agreement with the user, the acceptance can be carried out according to the following conditions: the manufacturer provides the user with a copy of the cutting machine test report; a.
The acceptance is carried out in the manufacturing area, and the user can supervise on site; the acceptance is carried out at the installation site designated by the user: the tolerance and performance of each data are checked or sampled. 9.3 If one of the indicators fails during the test or acceptance, double the number of samples can be re-tested. If one of the indicators still fails, the cutting machine is considered unqualified.
10 Warranty period
If the user uses and stores the cutting machine correctly according to the manufacturer's instructions, the manufacturer shall ensure that the cutting machine can operate well within one year (no more than 18 months from the date of shipment). Within this specified period, if the cutting machine is damaged or cannot work normally due to manufacturing quality, the manufacturer shall repair or replace (parts or cutting machine) for the user free of charge.
11 Labels, signs, and packaging
11.1 The following contents should be marked on the label:
Manufacturer name, registered trademark;
Standard code and equivalent international standard code (if there is an international standard code), cutting machine model;
Factory number:
Enclosure protection grade;
Weight;
Shape of external characteristic curve;
Cutting thickness range;
Current adjustment range (including corresponding load voltage): no-load voltage;
Input circuit connection method;
Primary input voltage and frequency,
Rated input capacity;
Air pressure.
11.2 Marking
Note;
On the current indicator dial, the area where the cutting current exceeds the rated value should be marked with the word "overload" to avoid overload danger. The output of the cutting machine, the input cable connector, the water pipe, the air pipe inlet and outlet should be permanently marked during use; the rotation direction of the cooling fan should be clearly marked; near the grounding bolt, there should be a symbol indicating grounding. d.
11.3 Packaging
11.3.1 The cutting machine (including accessories and spare parts) should be protected and fixed when packed, and rainproof measures should be taken to meet the needs of open-air storage and 593
transportation.
The technical documents accompanying the cutting machine packaging are: packing list,
factory certificate;
instruction manual.
Additional Notes:
JB/T7438-94
This standard was proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lin Chaoyong and Meng Zhaoguang. 5941 The following contents should be marked on the nameplate:
Manufacturer name, registered trademark;
Standard code and equivalent international standard code (if there is an international standard code), cutting machine model;
Factory number:
Enclosure protection level;
Weight;
Shape of external characteristic curve;
Cutting thickness range;
Current adjustment range (including corresponding load voltage): no-load voltage;
Input circuit connection method;
Primary input voltage and frequency,
Rated input capacity;
Air pressure.
11.2 Marking
Note;
On the current indicator dial, the area where the cutting current exceeds the rated value should be marked with the word "overload" to avoid overload danger. The output of the cutting machine, the input cable connector, the water pipe, the air pipe inlet and outlet should be permanently marked during use; the rotation direction of the cooling fan should be clearly marked; near the grounding bolt, there should be a symbol indicating grounding. d.
11.3 Packaging
11.3.1 The cutting machine (including accessories and spare parts) should be protected and fixed when packed, and rainproof measures should be taken to meet the needs of open-air storage and 593
transportation.
The technical documents accompanying the cutting machine packaging are: packing list,
factory certificate;
instruction manual.
Additional Notes:
JB/T7438-94
This standard was proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lin Chaoyong and Meng Zhaoguang. 5941 The following contents should be marked on the sign:
Manufacturer name, registered trademark;
Standard code and equivalent international standard code (if there is an international standard code), cutting machine model;
Factory number:
Enclosure protection level;
Weight;
Shape of external characteristic curve;
Cutting thickness range;
Current adjustment range (including corresponding load voltage): no-load voltage;
Input circuit connection method;
Primary input voltage and frequency,
Rated input capacity;
Air pressure.
11.2 Marking
Note;
On the current indicator dial, the area where the cutting current exceeds the rated value should be marked with the word "overload" to avoid overload danger. The output of the cutting machine, the input cable connector, the water pipe, the air pipe inlet and outlet should be permanently marked during use; the rotation direction of the cooling fan should be clearly marked; near the grounding bolt, there should be a symbol indicating grounding. d.
11.3 Packaging
11.3.1 The cutting machine (including accessories and spare parts) should be protected and fixed when packed, and have rainproof measures to meet the needs of open-air storage and 593
transportation.
The technical documents accompanying the cutting machine packaging are: packing list,
factory certificate;
instruction manual.
Additional Notes:
JB/T7438-94
This standard was proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lin Chaoyong and Meng Zhaoguang. 594
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