Some standard content:
S 73. 100.20
Registration No.: 154S1-2C05
Coal Industry Standard of the People's Republic of China
MT244.1-2005
Replaces MT244.1-19S7
Connecting parts of narrow-gauge vehicles in coal mines
Connecting chain
Car coupler of decauvllle for mine connecting chain2005-03-19 Release
National Development and Reform Commission
2005-06-01 Implementation
Specification vehicle reference documents
Model marking, variety and basic parameters
Technical requirements
Test method
Inspection regulations
Marking and packaging
MT244,1--2005
MT244,1---2005
The rail vehicle connection cow is an important component of the rising and falling transportation system, that is, the safety and low production, with a large application and a wide range of applications. With the development of coal ash production, the varieties and specifications specified in MT244.1-133 can no longer meet the requirements of coal industry safety. Its inspection needs to be improved. Therefore, MT344.1-997 is prohibited from retrogression. From the date of implementation, this standard will replace MT211.119. This standard is issued by the Science and Technology Development Department of China National Coal Industry Association. This standard is issued by the Coal Industry Safety Standardization Technical Committee. The starting unit of this standard is: China National Coal Explosion-proof Safety Product Quality Supervision and Inspection Center. The main person in charge of this standard is: Ming Liansi, Zhong Zhong. This standard replaces the standard model M244-1391, issued: M244.=2997 specification, 1 scope
connecting chain
coal mine track vehicle connecting parts
Mr244,1-205
This standard specifies the basic differences, technical requirements, test methods, inspection period, marking and packaging form of coal mine narrow gauge vehicle connecting parts.
This standard applies to various types of links and connections used in coal mine rail vehicles: 2 Normative referenced documents
The following documents become clauses of this standard through reference in this standard: Any referenced document with a date and all subsequent amendments (including date errors) or revisions are not applicable to this standard. However, the parties to an agreement on this standard are encouraged to research and develop the latest versions of these documents in advance. Any referenced document without a date, especially the latest version, shall not be used in this standard. G3/T 224
GB/T 229
GB/T 233
GB/T633
Determination method of decarburization degree
Charpy notch impact test method
Metal material maximum test force method
High quality hardness structure
H:T 4:53
GB/T 6394
Metal pyrolysis impact test method
Metal average grain size determination
3 Model marking, variety and basic parameters
Model marking
Shoe breaking section
Model marking information
Select 32u., main chain with a spacing of 60m.n. within 142mm. and the number of sections is 3. For example, 32×1txC0×3 three-ring chain is written as 2. 3. 2 Varieties
2) Single-ring static (see Figure 1)
MT 244. 1-235
b) Double-ring poem (see Figure 2):
Bad chain (see Figure)
d) Universal difference (see Figure 4):
3. 3 Basic dyeing effect
Basic parameters are shown in Table 1 and Table 2:
4 Technical requirements
Acid surface filter
4.1 When the joint chain meets the requirements of the wood standard and is manufactured according to the drawings and technical documents approved by the specified procedures, MT 244. 1—2005
Mass, kg
Quantity.kg
4.2 The material of the connecting chain shall be high-quality carbon steel or low-acid alloy steel, and the steel shall be pure stainless steel. Its chemical composition shall comply with the provisions of GB/T233. The material of the forged chain shall be subjected to thermal test, and the test method and test results shall comply with the provisions of GB/T233; the joint shall be made of hot-rolled material.
4.3 The tensile test of the connecting chain shall comply with the provisions of Table 3 to 4.1. 244.12005
Annual chain
Three-ring chain
Universal chain
Single-ring chain
Diameter, mm
Test load,
New load kN
The elongation of the continuous chain under the test load should not be less than 2%; the elongation under the continuous load should be less than 155%4.4
The bending test results of the connection should meet the requirements of Table 4 or Table 5 The bending test shall be sufficient, and the cracking effect shall be particularly evident after the bending test. This test shall not be conducted: diameter, bending degree m, diameter m, medium load m N. The impact energy of the connecting chain shall comply with the specified test items in Table 6. Normal impact. Impact energy at the joint shall be less than (40 ± 0.05) (4.7) The fatigue test of the connecting chain shall comply with the provisions of Table 6. No obvious cracking effect is allowed during the test. If the connecting chain has cracking effect after the fatigue test reaches the specified number of times, the connecting chain shall be subjected to a tensile test in parallel, and its breaking load shall not be less than 60 N. Table 7
Cyclic properties
Tricyclic
Square energy chain
Single-ring chain
Double-ring
Square energy chain
Single-ring chain
Tricyclic
Single-ring fresh
4.nun
Limit·ky
Labor Self-Government Bureau
Disease belt number, number
sc onn
MT 244.12005
4.8 After heat treatment, the product particles are rolled into uniform groups that meet the medium or finer grade of GH/T6394. The total breakage of forged chain shall not exceed (.Emmt) and the total breakage of welded chain shall not exceed 0.1mm. The minimum deviation of the chain length shall comply with the requirements of Table 3. 4.9
The diameter and
are in millimeters
4.10 The surface of the welded chain shall be smooth and clear, without any cracks. The height of the burrs shall not exceed 1 mm, and the depth of the scratches and scratches shall not exceed 1 mm. The displacement shall not exceed 1 mm. 4,11 The diameter of the welded joint shall not be less than the diameter of the material, and shall also be 715% of the actual diameter of the material: the diameter shall be in the shallow part of the chain link.
4,12 The surface of the welded joint shall be smooth, and the weld shall not have defects such as pores, luster, cracks, etc. 4.13 The surface of the welded joint shall be painted before leaving the factory. 4. 14
The materials used should have a certificate of conformity and be tested. 5 Testing methods
General provisions
5.1.1 The following measuring instruments shall be used for measurement: a) Steel ruler with a graduation value of 1mm; b) Standard caliper with a graduation value of 0.02m
5.1.2 The accuracy of various testing machines used in the test shall not be less than 1mm. 5.2 Tensile test 5.2.1 Elongation under test load: Apply the test load specified in Table 3 to the entire chain, and then reduce the initial load specified in Table 5 to the calibration length. Then continue to increase the load at a rate not exceeding 9V/1m· to the test load value specified in Table 2 to measure the elongation: Elongation under test load: tt| ... 5.2.2 After the test load test, load the broken steel bar at the specified load rate and measure the component length under the rated length. The elongation under the breaking load is:
, the elongation under the breaking load is, mm;
the rated length is
, and the load refers to the maximum load during the test. 5.3 Tension bending test
Lan×10c
Double-loop chain can be any one of them broken, three-loop chain must have a broken and edge loop: the sample is obtained as shown in Figure 5. Under the impact condition, the continuous amount of slow cutting is increased to the bending strain specified in Table 1 or the bearing capacity specified in Table 1. Figure 5
5.4 Impact test
The impact test is taken according to Example 6. Take a sample from each of the two connected chains. For the three-loop chain, take a sample from the bend of its loop: the weld is taken at the weld and the bend respectively: the opening of the sample is the outside of the loop. The sample should comply with the current symptoms of GT/T229. The temperature shock test shall be carried out in accordance with the provisions of GR/T229, and the low temperature punch-out test shall be carried out in accordance with the provisions of GB/T4159: Figure 6
5.5 Variable strain test
For the whole chain, the strain load specified in Table 7 shall be tested at a frequency of 400~100 times/ml. During the test, visual observation shall be used to see if obvious cracks appear. If there are cracks, the test shall be stopped. 5.6 The grain size determination after heat treatment shall be carried out in accordance with the provisions of GB/T6394, and the total delamination layer determination shall be carried out in accordance with the provisions of GB/T224. 6 Inspection rules
6.1 Factory inspection
, 1.1 The chain seat can be inspected and qualified by the quality inspection department of the manufacturer. The delivery inspection shall be carried out in accordance with the provisions of Table 10. 5.1.2 Inspection items Size increase, external quality, blood test, curvature test, reproductive test, disease test, low risk, gold period subgroup and full decomposition test, factory qualification inspection: 1 In areas with a risk of over 2 years, this inspection item shall not be carried out. 6.2 Judgment inspection Type inspection When one of the following situations occurs, type inspection shall be carried out: trial production of new products or old products and transfer production; type inspection when the material production process has a major change, which affects the performance; when the cattle are resumed to produce after more than 2 years of pregnancy!
Performed every 2 years during normal production;
When there is a big difference between the inspection and the last type inspection; When the national quality supervision agency has put forward the requirements for type inspection. Type inspection items are carried out according to the provisions of Table 1C. MT 244.1—2005
This inspection is not carried out one by one
Type inspection is carried out by the quality supervision agency authorized by the national customer. After passing the inspection, the product certificate can be issued and sold.
5.3 Sampling regulations
6.3.1 According to the size difference and the quality sample in the table, each batch of connections shall be registered at least. The number of samples for the tensile test shall be less than 1, but shall be less than 2. 6.3.29
The number of test samples shall be less than 1, but shall be less than 2. The number of samples for normal wet and low short impact shall be 1%, but each shall not be less than 2! 6.3.4bzxz.net
6.3.5 The number of samples for product particle size and total breakage shall be 1, 6.3.6 The number of samples for fatigue test shall be at least 2 for each resistance change chain. 6.3.7 The sampling for type inspection shall be based on the following: The number of samples for oil reaction and judgment rules for each change of qualified products
6.4.1 3~ items in Table 11, if there is 1 unqualified product (item) in each item, if there is 2 unqualified items in Table 10, the product shall be considered unqualified.
6.4.2 The number 2.3.4 and items in Table 10 are the main items. The number of re-inspection items is 1 item, and the number of re-inspection items shall be increased.
MI 244,1—2005
If there are still unqualified parts, the batch of connecting chains shall be judged as unqualified.6.4.3 In Table 10, card numbers 15 and 7 are for one day and one day. The number of inspection items is 2. After double the number of inspections, 2 items are qualified (single item judgment is the same as S.1), then the batch of connecting chains shall be judged as unqualified.7 Marking and packaging
1 connecting chain is wrong before leaving the factory. The middle (three-ring chain is in the middle ring, and the hall can hammer in 0. Note that there is a mark that can be retained for a long time. 7.2
The mark is inside:
The marking of the connecting chain by the manufacturer is the standard, and the year of manufacture. 3 The product mark can be expressed by words and letters. 73
The connecting chain is also tightly packed before leaving the factory.
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