Some standard content:
Mechanical Industry Standard of the People's Republic of China
Trolley-type gas cutting machine
1 Subject content and scope of application
JB/T 7436-94
ZBJ33001--87
This standard specifies the type, basic parameters, technical requirements, test methods, acceptance rules, etc. of trolley-type gas cutting machines (hereinafter referred to as gas cutting machines).
This standard is applicable to gas cutting machines that perform straight-line gas cutting on steel and are equipped with auxiliary tools for circular gas cutting. 2 Reference standards
GB2550
GB2551
GB5107
JB5101
Oxygen hose
Acetylene hose
Hose joints for welding and cutting
Cutting torch for gas cutting machine
JB6104 Rocker-arm profiling gas cutting machine
ZBJ59002.3 Thermal cutting Gas cutting quality and dimensional deviation 3 Type
3.1 This gas cutting machine refers to a motor-driven trolley loaded with a cutting torch, which moves along a linear guide rail and uses a cutting torch to cut straight cuts or grooves. It can also be equipped with auxiliary tools to cut flat circular parts.
3.2 Classification and model
3.2.1 Trolley-type gas cutting machines are divided into two categories according to the trolley speed regulation method: electrical regulation and mechanical regulation. 3.2.2 The model of a trolley-type gas cutting machine consists of five parts: the first part is composed of the first capital letters "G" and "C" of the Chinese pinyin of the two words "cut" and "car" in the name of the trolley-type gas cutting machine. The second part is the first capital letter "D" or "J" of the Chinese pinyin of the two words "electric" and "machine" of the trolley speed control mode. The third part is the Arabic numerals "1" or "2", which are the codes for being equipped with a suction cutting torch or an isobaric cutting torch respectively. The fourth part uses two or three Arabic numerals to indicate the maximum gas cutting thickness. The fifth part is the Latin letters ABC..., which indicates the modification code. Example:
3.3 Structure
Indicates the first modification
Indicates the maximum gas cutting thickness is 100mm
Indicates equipped with an isobaric cutting torch
Indicates that the trolley speed regulation method is electrical regulation
Approved by the Ministry of Machinery Industry of the People's Republic of China on September 6, 1994 and implemented on July 1, 1995
The structural diagram of the trolley gas cutting machine is shown in Figure 1. JB/T 7436—94
Figure 1 Schematic diagram of the structure of the trolley gas cutting machine
1-Main body, 2-Drive system, 3-Torch and gas system 4-Control system; 5-Guide rail
4 Basic parameters
4.1 The gas cutting thickness range and speed range of the trolley gas cutting machine are listed in Table 1. Table 1 Gas cutting thickness range and speed range of trolley-type gas cutting machine Gas cutting thickness range, mm
4.2 Trolley-type gas cutting machine trolley gauge (L) series: 100, 125, 160, 200, 250, 315mm. 4.3 Guide rail length series:
1400, 1800mm.
4.4 See Figure 2 for the basic type of guide rail.
Figure 2 Basic type of guide rail
Speed range, mm/min
JB/T 7436-94
4.5 Other parameters and guide rail types are allowed to be adopted according to the negotiation between the supply and demand parties. 5 Technical requirements
5.1 The quality of the gas cutting surface with a thickness of 5~~100mm should be higher than the level 1 requirement specified in ZBJ59002.3, and the workpiece size should comply with the provisions of Table 2. Gas cutting thickness outside the above range is not specified. Table 2 Workpiece size deviation
Gas cutting thickness
>50～~100
35～315
Basic size range
1 0002 000
The air tightness of the gas system connection parts and gas valves shall comply with the provisions of Article 5.4 of JB6104. The cutting torch equipped on the gas cutting machine shall comply with the provisions of Chapter 6 of JB5101. The speed change rate of the gas cutting machine should be less than 15%. 5.5
The gas cutting machine should not crawl downhill at a slope of 1:50. 5.6
When the positioning rail of the gas cutting machine is placed horizontally, the straightness within a length of 1000mm on the horizontal plane should be less than 0.6mm. The insulation of the electrical system should be reliable. The insulation resistance between the housing and the power plug should be greater than 1MQ. The pneumatic switch can be opened and closed under the condition of oxygen pressure of 0.2~~0.25MPa. The error of the zero-degree scale value of the cutting torch rotation angle should be less than 1°. 5.9
After the main motion clutch of the gas cutting machine is closed, the movement should be less than 2mm. 5.10
The oxygen hose and the B hose shall comply with the provisions of GB2550 and GB2551 respectively. 5.11
The gas passage hose joint shall comply with the provisions of GB5107. mm
2 000~4 000
The surface of the gas cutting machine should be clean, and no defects such as sand gums, slag, burrs, etc. are allowed. Except for the necessary functional requirements, all sharp edges should be blunted or flattened.
The adjustment part, sliding part and moving part of the gas cutting machine should be flexible. 6 Test methods
6.1 Gas cutting test
6.1.1 Test conditions
The gas cutting material is low carbon steel plate;
The oxygen purity should be greater than 99.5%;
The effective length of gas cutting is greater than 350mm (length-width ratio 4:1)c
The thickness of the gas-cut steel plate is tested according to the lower and upper limits of the rated gas cutting thickness of the gas cutting machine. 6.1.2 The quality and dimensional deviation of the gas-cut surface should comply with the provisions of Article 5.1 of this standard. 6.2 Air tightness test
The gas system is passed through oil-free gas at the pressure specified in Article 5.2 of this standard. The gas is placed in water with the gas valve closed and open. After the water surface is calm, the pressure is stabilized for 20 seconds. There should be no leakage. If some parts cannot be immersed in water, soap solution is allowed to be used for testing. There should be no leakage for 40 seconds.
6.3 Cutting torch test
The test method of the cutting torch equipped on the gas cutting machine shall comply with the provisions of Article 7.1 of JB5101. 6.4 Speed change rate testbzxz.net
6.4.1 Test conditions
Power supply voltage 220V;
Effective test length 1000mm.
Testing instruments and measuring tools
Regulator, the voltage range should be less than ±5%; JB/T 7436-94
Steel ruler, measuring range 1000mm, accuracy should be higher than ±0.2mm; stopwatch, accuracy should be higher than ±0.1s.
6.4.3 Test method
Place the track on a horizontal base surface. Mark every 200mm length, and mark five sections in total. The test speed is the upper limit Umx, lower limit Umin and (m + min)/2 of the operating speed range of the gas cutting machine. Run twice in each measuring section. Measure 10 speed values for each speed, and select the highest and lowest values im. The change rate of each speed should meet the requirements of formula (1).
Where: A*——speed change rate;
umax—highest speed value, mm/min;
vmin-lowest speed value, mm/min.
6.5 Downhill stability test
6.5.1 Test conditions
The thickness of the steel plate should be greater than 20mms
b. The effective test length is 1000mm.
Test method
Vnx - Vmin
X100%≤15%
Umax +umin
Put up the steel plate at a slope of 1:50 and put the guide rail in place. Take the downhill test speed calculated by formula (2) and run for an effective length of 1000mm, and measure whether there is any creeping phenomenon.
Where: \
Downhill test speed of gas cutting machine, mm/min: upper limit of gas cutting machine operating speed range, mm/min, lower limit of gas cutting machine operating speed range, mm/min. 6.6 Positioning guide rail straightness detection
6.6.1 Testing equipment
Square ruler, length should be greater than 1000mm, accuracy should be higher than level 2, b, dial indicator, with magnetic base bracket.
6.6.2 Test method
As shown in Figure 3, make a slide in combination with the guide rail type and fix the dial indicator on the slide. Adjust the size so that the readings of the dial indicator at both ends of the 1000mm length are equal, and its straightness should comply with the provisions of Article 5.6 of this standard. 6.7 Electrical insulation test
When testing with a 500V megohmmeter, it should comply with the provisions of Article 5.7 of this standard. 6.8 Pneumatic switch reliability test
Perform an opening and closing test according to the pressure specified in Article 5.8 of this standard, and there should be no failure for 50 consecutive times. 6.9 Cutting torch zero scale test
6.9.1 Testing tools
JB/T7436-94
Figure 3 Schematic diagram of positioning guide rail straightness testing
1—Positioning guide rail?2—Block?3—Digital indicator=4—Square ruler Universal angle ruler, the accuracy should be higher than ±0.02". 6.9.2 Testing method
Place the gas cutting machine on a horizontal base surface, adjust the cutting torch to the zero scale position, and the error value should be less than ±1°. 6. 10 Momentum detection
6.10.1 Testing tool
Vernier caliper, the accuracy should be higher than ±0.02mm. 6.10.2 Testing method
Close the clutch of the main motion of the air machine, pull it to one side, and its motion should be less than 2mm. 7 Acceptance regulations
7.1 Each product must undergo an air tightness test. 7.2 Randomly inspect 2% of each batch of products, at least three units, and conduct cutting torch, speed change rate, downhill stability, guide rail straightness, electrical insulation, pneumatic switch reliability tests and cutting torch zero scale, movement amount, and basic parameter inspections. 7.3 Randomly inspect one unit from each batch of products and conduct gas cutting test. 7.4 If there are unqualified items during random inspection, double the inspection of that item. When all the re-inspections are qualified, only the unqualified products in the initial inspection will be returned for repair; if one unit fails this item after the re-inspection, the batch of products will be judged to be unqualified. 7.5 Delivery Products must have product certificates, operating instructions and packing lists. 8 Marking, packaging, storage and transportation
8.1 The label of the gas cutting machine should indicate the model, name, date of manufacture (year, month), main technical parameters and factory name. 8.2 The packaging of the gas cutting machine should be rainproof, moisture-proof, and anti-bag, and meet the transportation requirements. 8.3 The storage environment of the gas cutting machine should be dry and ventilated, and no corrosive and flammable gases are allowed. 9 Quality assurance period
If the user complies with the rules for storage, transportation, installation and use of the gas cutting machine, the manufacturer shall be responsible for warranty or replacement if the product cannot work normally due to poor manufacturing quality within six months from the date of shipment. Additional remarks:
This standard is proposed and managed by Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard is drafted by Harbin Welding Research Institute of the Ministry of Machinery Industry. The main drafter of this standard is Liu Hongge.
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