This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of hydraulic supports for sliding top beams used in mines (hereinafter referred to as supports). This standard applies to hydraulic supports for sliding top beams used in mines. MT 458-1995 General Technical Requirements for Hydraulic Supports for Sliding Top Beams MT458-1995 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
General Technical Conditions for Sliding Top Beam Hydraulic Support Subject Content and Scope of Application
MT 458--1995
This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of mining sliding top beam hydraulic support (hereinafter referred to as support).
This standard applies to mining sliding top beam hydraulic support. 2 Reference standards
GB/r 197
General thread tolerances and fits (diameter 1 ~ 355mm) Shape and position tolerances Provisions for unspecified tolerances GB/T 1184
GB/T1222 Spring steel
GB/T1239.1 ~ 1239.5 Cylindrical helical springs GB/T 1804
General tolerances Unspecified tolerances for linear dimensions
GB/T2649 ~ 2653 Test methods for mechanical properties of welded joints GB/T3452.1 Dimension series and tolerances of O-rings for hydraulic and pneumatic use Tolerances of dimensions of castings
GB/T 6414
GB/T 7935
GB/T 11352
General technical conditions for hydraulic components
Casting carbon steel parts for general engineering
GB12361
General technical conditions for steel die forgings
GB/T13306 plate
JB4385
General technical conditions for free forgings on hammer
Emulsified oil for hydraulic support
Cylinder diameter and column diameter of main column and dry jack of hydraulic support for miningTechnical conditions for hydraulic support jacks
Type test specification for hose assembly and intermediate joint assembly of hydraulic support for miningSingle hydraulic prop for mining
MT 112
General technical conditions for hydraulic support
MT 312
Valve for hydraulic support
3 Terms
3.1 Sliding top beam hydraulic support
The top beam is combined with the support column, and the front and rear (or left and right, inside and outside) top beams are guided by each other and move forward. 3.2 Single-section beam body
Relatively independent top beams are connected to each other by a push device. 3.3 Articulated beam body
The front and rear top beams are connected together in an articulated manner. Approved by the Ministry of Coal Industry of the People's Republic of China on December 28, 1995, 384
Reduced to implement on April 1, 1996
4 Technical requirements
4.1 General technical requirements
MT458-1995
4.1.1 The support shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1.2 The chemical composition and physical and mechanical properties of the raw materials of the parts shall comply with the provisions of national standards and industry standards. The steel grade and mechanical properties of the spring steel plate used shall comply with the provisions of GB/T1222. 4.1.3 All outsourced and purchased parts must have a certificate of quality and must be assembled after acceptance. 4.1.4 The tolerance of non-matching linear dimensions of metal cutting parts shall comply with the C-level provisions in GB/T1804. 4.1.5 The shape and position tolerance of metal cutting parts shall comply with the C-level provisions in G3/T1184. 4.1.6 Ordinary threads shall comply with the provisions of GB/T197. When ordinary threads are not filled with tolerances, the internal threads shall be manufactured according to 7H and the external threads shall be manufactured according to 6%.
4.1.7 Cast steel parts are not marked with dimensional tolerances and are manufactured according to the requirements of CT12 in (B/T6414. 4.1.8 Ordinary springs shall comply with the provisions of GB/T1239.1~1239.5. When the spring characteristics and dimensional deviations are not specified in the figure, all springs except those for liquid core parts shall be manufactured according to grade precision. 4.1.9 T. The working fluid is prepared with emulsified oil and neutral water specified in MT76. The weight ratio of emulsified oil and water is: . The liquid for the working surface is 5:95 for the closed-circuit system and 2:98 for the open system; the liquid for the laboratory is 5:95, and the special 5 hydraulic oil for coal mines is also allowed. 4.1.10 All parts and components should be deburred and cleaned before assembly, and assembled according to the provisions of the drawings and technical documents. 4.1.11 Painted parts should be derusted and coated with anti-rust primer before painting. 4.2 Technical requirements for hydraulic components
4.2.1 Hydraulic props
Hydraulic props shall comply with the provisions of Appendix A (supplement) of this standard. 4.2.2 Hydraulic jacks
4.2.2.1 Hydraulic jacks shall comply with the provisions of MT97. 4.2.2.2 The cylinder diameter and rod diameter of hydraulic jacks shall comply with the provisions of MT94. 4.2.3 Hydraulic valves
4.2.3.1 Three-way valves shall comply with the provisions of MT112. 4.2.3.2 Hydraulic-controlled one-way valves, control valves, etc. shall comply with the provisions of MT419. 4.2.4 High-pressure hose assemblies and intermediate joint assemblies High-pressure hose assemblies and intermediate joint assemblies shall comply with the provisions of MT98. 4. 3 Technical requirements for the entire frame
4.3.1 Appearance quality requirements
4.3.1.1 The parts and pipelines of the bracket are fully assembled, correctly positioned, and reliably connected. 4.3.1.2 The paint layer on the outer surface of the bracket is evenly coated without peeling, blistering, or sagging. 4.3.1.3 Exposed welds shall comply with the provisions of Appendix A (supplement) of MT312. 4.3.1.4 The appearance of castings shall comply with the provisions of GB/T11352. 4.3.1.5 The appearance of forgings shall comply with the provisions of GB/T12361 and JB4385. 4.3.1.6 The exposed electroplating layer shall comply with the provisions in Appendix B (supplement) of this standard. 4.3.2 Operational performance
Under the rated fluid supply pressure and flow of the bracket, the bracket completes the movement The moving parts should be easy to operate, and the movements should be accurate, flexible, and free of stagnation and jamming.
4.3.3 Sealing performance
The piston of the hydraulic support of the support is extended to 2/3 of the full stroke, and the pressure is stabilized at 20MPa for 5 minutes. The pressure shall not drop, and no leakage is allowed for 4 hours.
Slow-transmission diagram
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4.3.4 Support performance
MT458-1995
4.3.4.1 Under the rated fluid supply pressure, the initial support force of the support shall not be less than 95% of the rated initial support force. 4.3.4.2 The working resistance of the support shall not be greater than 110% of the rated working resistance and shall not be less than 90% of the rated working resistance. 4.3.5 Strength requirements
4.3.5.1 Strength requirements for single-section beam supports After the loading test described in 5.6.1, the beam welds and parent materials shall not crack, and other parts shall not be damaged. 4.3.5.2 Strength requirements for articulated beam supports After the loading test described in 5.6.2, the welds and parent materials shall not crack, and parts shall not be damaged. 4.3.5.3 Strength requirements for other beam structure supports The strength requirements for other beam structure supports shall increase the assessment content according to the design requirements. After the test, the welds and parent materials shall not crack, and other parts shall not be damaged.
4.3.6 Durability requirements
4.3.6.1 The single-section beam support shall be subjected to durability test as described in 5.7.1. After cyclic loading in different ways, there shall be no cracks in the welds and parent materials, and the support shall still meet the performance requirements in 4.3.2; 4.3.3; 4.3.4. 4.3.6.2 The articulated beam support shall be subjected to durability test as described in 5.7.2. After cyclic loading, there shall be no cracking in the weld, no breakage in the dye body, no damage in the hinged part, and the support shall still meet the various performance requirements in 4.3.2; 4.3.3; 4.3.4. 4.3.6.3 When the beam structure is of other types, the durability test shall be carried out as described in 5.7.3. After cyclic loading, there shall be no cracking in the weld and the parent material, and the support shall still meet the various performance requirements in 4.3.2; 4.3.3; 4.3.4. 5 Test method
5.1 Test equipment and conditions
5.1.1 The loading capacity and height of the external loading test bench or the internal loading test bench shall meet the design requirements of the tested support. 5.1.2 The working fluid temperature shall be controlled at 10-50℃, and the working fluid shall be filtered by a filter with a precision of 0.125mm, and a magnetic filtration device shall be provided.
5.1.3 The accuracy of the inspection instruments, equipment and measurements shall meet the requirements of Class C in GB7935. When using a direct-reading pressure gauge, the range shall be 140% to 200% of the test pressure.
5.1.4 See Table 1 for the test system error.
Test instrument parameters
Flow rate, %
When the pressure is equal to or exceeds 2×105 Pa, %Temperature, ℃
5.2 Appearance quality
Visual inspection under sunlight or normal lighting shall meet the requirements in 4.3.1. 5.3 Operational performance
Test level (C)
Under the rated liquid supply pressure and flow rate, the bracket completes no less than 2 relocation cycles in the operating sequence, and each time reaches the designed relocation step distance. The result shall meet the requirements in 4.3.2.
5.4 Sealing performance
The test bench test height is adjusted to about 2/3 of the maximum stroke of the support hydraulic support. The support is installed in the test bench and the piston cavity pressure reaches 20MPa and then stabilized for 5min and 4h. The result should meet the requirements of 4.3.3. 5.5 Support performance
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MT 458-1995
5.5.1 The support is installed in the external loading or internal loading test bench, and the piston cavity pressure of the support hydraulic support reaches the rated fluid supply pressure. The fluid supply is cut off and the pressure is stabilized for 5min. The pressure value in the support is measured, which should meet the requirements of 4.3.4.1. 5.5.2 After the piston cavity pressure of the hydraulic support of the support reaches the rated fluid supply pressure, load externally or internally at a slow speed to open the safety valve and measure the pressure value in the support. After the safety valve stops overflowing for 5 minutes, measure the pressure value in the support again. It should meet the requirements of 4.3.4.2. 5.6 Strength test
5.6.1 Strength test of single-section dye support
The test height of the support is adjusted to about 2/3 of the maximum stroke of the hydraulic support of the support. According to the pad position specified in Table 2, gradually apply external or internal loading to 1.1 times the rated working resistance, stabilize the pressure for 5 minutes, and load 3 times. The result should meet the requirements of 4.3.5.1. Table 2
Loading method
Concentrated load
Concentrated load
5.6.2 Strength test of articulated beam support
Pad position
Pad and its position size
b-60～100
(the same below)
The pad length is determined according to the beam width
or the support width
-Beam-column is only subjected to
this test
The support test height is adjusted to about 2/3 of the maximum stroke of the support hydraulic support. According to the pad position specified in the figure (any one pad is not less than 100 from the center line of the column), gradually apply external or internal loading to 1.1 times the rated working resistance, stabilize the pressure for 5 minutes, and load 3 times. The result should comply with the requirements of 4.3.5.2. 700
Note: b60～100t≥40
5.6.3 Strength test of other beam structure supports The strength test of other beam structure supports shall increase the assessment content according to the design requirements, and the results shall comply with the provisions of 4.3.5.3. 5.7 Durability
The durability test shall be carried out after all the above tests are qualified. 5.7.1 The durability test height of single-section beam support
is the same as that of the support strength test. Internal loading, the pressure of the support piston cavity is the rated working pressure. According to the diagrams of 5.6.1.1 and 5.6.1.2 in Table 2, the cycle loading is 1000 times each. The inspection results after the test shall comply with the provisions of 4.3.6.1. 5.7.2 The durability test height of articulated beam support
is the same as that of the support strength test. Internal loading, the pressure of the support piston chamber is the rated working pressure, according to the pad position specified in Figure 1, the load is cyclically loaded 2000 times. The inspection results after the test shall comply with the provisions of 4.3.6.2. 5.7.3 Durability of other beam structure supports The durability of other beam structure supports is based on the same pad position as in the strength test, and the load is cyclically loaded 500 times under each pad position. The inspection results after the test shall comply with the provisions of 4.3.6.3. 387
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6 Inspection rules
6.1 Inspection classification
MT 458 --. 1995
6.1.1 Product inspection is divided into factory inspection and type inspection. Factory inspection is carried out by the inspection department of the manufacturer. Type inspection is carried out by the National Support Equipment Quality Monitoring Center designated by the superior quality supervision department. User acceptance is carried out according to the factory inspection items. 6.1.2 Type inspection shall be conducted in any of the following cases: a.
When a new product is finalized or an old product is converted to trial production; when changes in product design, process or materials may affect product performance; when a product is discontinued for more than 3 years and then resumed; when the national quality supervision agency makes a request; when the user has major objections to product quality; in normal production, an inspection shall be conducted once every 3 years. The type inspection items for the whole bracket shall be in accordance with Table 3.
The factory inspection items for the whole bracket shall be in accordance with Table 4.
Inspection items
Appearance quality
Operational performance
Sealing performance
Support performance
Strength requirements
Durability
Inspection items
Appearance quality
Operational performance
Sealing performance
6.2 Sampling
No. of this standard
Technical requirements
Test method
Test sample frame
Test sample frame
Test sample frame, only the hydraulic support and the matching valves can be tested. Test sample frame, only the hydraulic support and the matching valves can be tested. Test sample frame
Test sample frame
This standard No.
Technical requirements
6.2.1 Type inspection 1 test sample.
Test method
Only the hydraulic prop and the matching valve can be tested. 6.2.2 The number of random inspections for factory inspection shall be 3% of each batch of products, but not less than 2 racks. 6.3 Judgment rules
6.3.1 In the type inspection, if there are unqualified items, the sample rack is allowed to be processed and the item is retested. The number of retests for the durability test items shall not exceed 2 times, and the number of retests for other items shall not exceed 1 time; if a hydraulic component fails, it is allowed to be replaced and otherwise processed, but the same component is only allowed to be replaced or processed once. If it still fails after the retest, it is judged to be unqualified. 6.3.2 Factory inspection is divided into whole rack inspection and hydraulic component inspection. Among them, the hydraulic prop shall be carried out in accordance with the provisions of Appendix A of this standard, and other hydraulic components shall be carried out in accordance with the provisions of relevant standards. If there are unqualified items in the whole frame inspection, the item will be double-checked, and if it fails again, the whole inspection will be carried out. 7 Marking, packaging, transportation and storage
7.1 The type and size of the product label shall comply with the provisions of GB/T13306. The product label shall include the following contents:
Product name;
Product model:
Working resistance;
Support height;
Weight of the whole frame;
Overall dimensions (length×width×height)
Manufacturer name;
Factory number:
Date of production;
Production license number;
Safety mark number.
7.3 After the product is accepted, the bracket is disassembled and packaged. The beam body packaging should meet the requirements of users and railway transportation departments. 7.3.1
7.3.2 The pillars and dry jacks should be lowered to the lowest height before packaging, and the internal emulsion should be drained. The openings of each joint should be plugged and covered with plastic bags and tied firmly. They should be packaged in containers or special packaging racks. 7.3.3 Three-way valves and other valves should be packaged in wooden boxes. Random tools and loose parts should be packaged in wooden boxes.
7.4 The following documents must be attached to the shipment of the bracket: a.
Product certificate;
Operation and maintenance instructions;
Product type test report;
List of random spare parts and wearing parts;
Packing list.
The above documents should be packed in moisture-proof packaging bags and placed in packaging boxes. 7.5 The bracket should be stored in a warehouse or under cover, and anti-rust, anti-freeze and dust-proof measures should be taken. 389
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A1-General Technical Requirements
MT458--1995
Appendix A
Technical Requirements and Performance Test of Hydraulic Support
(Supplement)
A1.1 The maximum height of the hydraulic support and the inner diameter of the cylinder I shall be selected according to the series specified in MT112. A1.2 Welding parts shall comply with the provisions of GB2649. Pressure-bearing welds shall be subjected to pressure resistance tests, and the test pressure shall be 1.5 times the rated working hydraulic pressure. Line.
Weld strength shall meet the following requirements:
Tensile strength ≥500MPa
Elongation 85 ≥10%
A1.3 The weld surface shall be smooth, and defects such as incomplete penetration, slag inclusions, and cracks are not allowed. A1.4 Forgings shall comply with the provisions of GB12361 and shall not have defects such as interlayer, crack, fold, scar, undercut, etc. Local defects caused by reasons such as removing oxide scale are allowed on the non-machined surface of forgings. A1.5 Springs for pillars shall comply with the relevant provisions of GB1239. If no technical requirements are specified, they shall be inspected according to the first-level precision in GB1239. A1.6 The technical requirements for the quality of the electroplating layer shall be implemented in accordance with Appendix B. A1.7 The O-ring shall comply with the requirements of GB3452.1, and the other rubber products shall comply with the requirements of the drawings and technical documents. A1.8 Cleanliness requirements:
The average cleaning residue of each pillar shall not exceed 60mg, and the highest one shall not exceed 70mg. a.
The cleaning residue of the three-way valve shall not exceed 10mg. b.
A1.9 All parts are complete and the assembly position is correct; all connecting wires are driven into the grooves, and the grooves are sealed with putty. A2
Performance requirements and test methods
Performance requirements and test methods are shown in Table A1.
Test Items
No-load Travel Test
Minimum Starting
Pressure Test
Piston Rod Chamber
Sealing Performance
Performance Requirements
Test Method
The telescopic length shall meet the design requirements and shall not have any lag, creeping and external leakage. Under no-load conditions, the full stroke reciprocating action shall be limited to 3 times, and the speed shall not exceed 200mm/min. The starting pressure of the piston chamber shall not exceed 3.5MPa, and the starting pressure of the piston rod chamber shall not exceed 7.5.bzxz.net
The pressure shall not drop or leak at the same temperature.
Marking Degree Network AW.b0|| tt||Under no-load condition, gradually increase the pressure of the pillar to measure the minimum starting pressure of the piston chamber and the piston rod chamber when the pillar is extended and retracted
All tests are conducted under no back pressure
The pillar is retracted to the minimum height, and the piston rod chamber is stabilized at 1MPa and 110% rated pump pressure respectively
(1) Read and record the pressure again after the pressure reaches 1min
(2) The low-pressure sealing pressure for factory inspection is 2MPa. Free download of various marking industry materials
Test items
Piston chamber
Sealing performance
Durability
Strength test
Impact test
Body explosion
Performance requirements
MT 458
Continued Table A1
The pressure shall not drop or seep at the intermediate temperature
Test method
The pillar is raised to 2/3 of the full stroke and axial loading is carried out. The piston chamber is maintained at 1MPa and 110% of the rated pressure for 5 minutes, of which 1 pressure is maintained for h
(1) Read and record the pressure again after the pressure reaches 1 minute
(2) Factory inspection low pressure seal pressure is 2MPa (1) The cumulative stroke is not less than 70m. Number of cycles (1) After the pillar is raised to 2/3 of the stroke, the axial center load shall not be less than 2000 times, and it shall meet the requirements of Article A24 in Table AI
from 0 to 110% of the rated load, and then suddenly unloaded; the loading speed is 20~25mm/min, and the overflow stroke is 3040 each time mm continuous cycle test
|(2) The support piston cavity is given back pressure. After the piston rod cavity (2) reciprocates 2000 times, it should meet the requirements of item A2.3 in Table A1
The rated pressure of the pump station is added to lower the column, and then the column is raised without load. Full stroke reciprocating test
(1) No leakage is allowed during the test. 1 (1) The support is raised to the maximum stroke and disassembled for inspection after the rated working test. There should be no deformation of the parts and 150% axial center load of the load for 5min||tt ||(2) No leakage is allowed during the test. After the test, the piston can be raised and lowered freely
(3) No leakage is allowed during the test. The parts of the pillars cannot be deformed or damaged during disassembly and inspection. (4) No leakage is allowed during the test. The pillars must be disassembled and inspected. The parts cannot be deformed or damaged. The pillars must not be permanently deformed or damaged. After the test, the piston can be raised and lowered freely
The bursting pressure should be greater than 2 times the rated working pressure of the pillars. The rupture should be plastically deformed. Brittle fracture into pieces is not allowed
The lower reduction|| tt||(2) The pillar is raised to the maximum stroke and loaded axially at 200% of the rated working load for 5 min.
(3) The pillar is retracted to the minimum height and loaded axially at 200% of the rated working load for 5 min. The piston chamber is allowed to maintain the pressure until the safety valve closes.
(4) The pillar is raised to the maximum stroke and loaded axially at the rated working load on the same side of the column head and the base with an eccentricity of 20 mm for 5 min.
The pillar is raised to the maximum height and preloaded axially at the center. It is 60% of the rated load of the pillar. Use a 1t weight to fall freely from a height of 1.5m and impact the column head twice. Seal both ends of the cylinder body and gradually increase the pressure with a pressure pump. This test should be done when the cylinder body uses new materials until the cylinder body is destroyed and the cylinder body wall thickness is changed. Type inspection and factory inspection MT458—1995 The inspection items of type inspection and factory inspection are shown in Table A2. A3.1
Inspection items
Appearance quality
Electroplating quality
Cleanliness
No-load stroke test
Minimum starting pressure
Piston rod chamber sealing performance
Piston chamber sealing performance
Durability test
Strength test
Impact test
Cylinder body burst test
Note: "√" in the table means that the item is fully inspected; "^" means that the item is sampled;
"X\" means that the item is not inspected.
Standard article number
Al.3,A1. 4,A1. 9
Appendix B
A3.2 The samples for random inspection items are 3% of each batch, but shall not be less than 3 pieces. Type
Inspection Category
A3.3 If one test fails during the inspection, the item shall be double-checked. If the item still fails after double-checking, the product shall be deemed unqualified.
A3.4 The number of inspected pieces for type inspection is 3 pieces, and only one of them shall be tested for durability; two pieces shall be tested for cylinder body bursting. A3.5 Random sampling shall be adopted for user acceptance, and the inspection shall be carried out according to factory inspection. The sampling quantity shall be 3% of the order or delivery quantity, and the sampling quantity may be reduced by negotiation between the two parties.
A3.6 There shall be an inspection report for product type inspection, and the results of product factory inspection shall be recorded and filed for future reference. Appendix B| |tt||Technical requirements for electroplating of hydraulic prop parts (supplement)
B1 Basic requirements
Before electroplating, the material, dimensional accuracy and surface defects of the plated parts shall be inspected. If they fail to meet the requirements, the electroplating process shall not be carried out. B2 Selection of coatings
B2.1 The piston shall adopt the following composite coatings: 392
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Copper-tin containing gold and hard chromium;
Copper-tin alloy and opalescent chromium;
Oopalescent chromium and hard chromium:
Other protective coatings required by the user.
B2.2 The inner surface of the cylinder shall adopt the following coatings: a.
Copper-tin containing gold:
Copper-tin alloy and opalescent chromium;
Other effective protective coatings that have been identified. MT 458-1995
The coating or surface protection technology of other parts shall meet the design requirements B2.3
The thickness of the coating
The thickness of various coatings using composite coatings: copper-tin alloy 20~30μm; hard chrome 3040μm.
Copper-tin containing gold 20~30μm; opalescent chrome 30~50um. Opalescent chrome 20~~30μm; hard chrome 30~40μm. Using single-coating thickness·
Copper-tin alloy 25~40μm;
Galvanized 15~20 μm.
B3.3 The thickness of other protective coatings shall comply with relevant technical documents. Coating hardness
Copper-tin alloy and milky chrome HV≥500;
Milky chrome and hard chrome
HV≥800;
Copper-tin alloy and hard chrome HV≥800.
B5 Bonding strength requirements
The coating should not have peeling, shedding or blistering. B6 Coating appearance quality requirements
B6.1 The coating crystallization should be fine and uniform, and the following defects are not allowed: a.
Surface roughness, particles, burning, cracks, blistering, shedding; dendritic crystallization;
Partial absence of coating or exposure of intermediate layer;
Dense pitting.
B6.2 Allowable defects in the coating
The porosity of the coating should be less than 15 points/dm2, and its diameter should not exceed 0.2mm. B6.2.1
The coating is dark at the weld.
The quality of the coating on the rough surface and the back groove surface is not assessed. B6.2.4 There is a rough surface at the chamfer that does not affect assembly. B6.3 Appearance quality inspection should be carried out under sunlight or normal light without reflected light. Note transmission slow network wbs
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Additional instructions:
MT458-1995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Support Branch of the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted by the Beijing Mining Research Institute of the China Coal Research Institute. The main drafters of this standard are: Zou Zhengli, Li Hecai. This standard is entrusted to the Beijing Mining Research Institute of the China Coal Research Institute for interpretation. 394
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