This standard is a revision of MT/T 776-1998 (Specification for factory inspection of hydraulic system assembly of coal mine machinery). This standard replaces MT/T 776-1998. The main changes of this standard compared with MT/T 776-1998 are as follows: - Added cleanliness index of servo valve hydraulic system (see Table 1); - Added setting requirements for hydraulic motor (see 3.5.1 and 3.5.3); - Added "diagnosis and monitoring" (see 3.12); - More detailed and specific requirements for marking, packaging and transportation (see Chapter 6). This standard was proposed by the Science and Technology Development Department of China Coal Industry Association. This standard is under the jurisdiction of the Coal Industry Coal Mine Special Equipment Standardization Technical Committee. The drafting unit of this standard: Shanghai Branch of China Coal Research Institute. The main drafters of this standard: Hu Dabang, Feng Xiaodi. This standard was first issued in November 1998, and this is the first revision. MT/T 776-2004 Coal Mine Machinery Hydraulic System Assembly Factory Inspection Specification MT/T776-2004 Standard download decompression password: www.bzxz.net

[0S 73.100.99
Record number: 15451-2005
Coal Industry Standard of the People's Republic of China
MT/T 776-2004
MT/77-1998
Specification for routine inspection of coal miningmaehine-hydraulic.syslem assembly2004-12-14 Issued
National Development and Reform Commission
2005-06-01 Implementation
Regulation on old documents
Technical requirements
Test force method
Inspection rules
Packing and transportation
MT/I 776-2004
MT/T 776-2004
1998 Coal Mine Machinery and Equipment Liquid Limit System General or Factory Inspection Specifications. This standard replaces MT/T776
MT/T 771: 1938.
This standard and MT/T776-1S98 and the main changes are as follows: - Added the cleanliness index of the service filter pressure system (state 1) 1 Added the requirements for the hydraulic pressure setting (see 3.5.1 and 3.5.3 (0.3)), - Added "interruption and monitoring\see 3. 12), the requirements for marking, packaging and transportation are more detailed and specific (currently the 6th draft). This standard is issued by the Science and Technology Development Department of the China Coal Industry Association. The international standard is under the jurisdiction of the Coal Industry Coal Special Fund Standardization Technical Committee. The drafting unit of this standard: Shanghai Branch of China Coal Research Institute. The main drafters of this standard: Hu Taibang, Ma Xiaodi, single standard--November 18, the first release: this time for the second level.
1 Fan Tian
Coal Mine Machinery Hydraulic System Assembly Factory Inspection Specification MTT776-2004
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and transportation of the hydraulic system assembly of the freezing machine.
This This standard is applicable to the factory specifications of the hydraulic system assembly of coal mine machinery with hydraulic oil as the working medium and a working pressure not higher than 31.5Ma. 2 Normative reference documents The clauses in the following documents become the clauses of this standard through the availability of the standard. For any referenced document with a date, all subsequent amendments (excluding the internal wear of the revision) or revisions do not apply to this standard. However, the parties to the agreement on the applicability of the standard may study whether the latest versions of these documents can be used. For any referenced document without a date, the latest version shall apply to this standard: (H/3755-2001 Technical conditions for hydraulic system (EQ1SO4413: 208) GH3837.1-20 00 Electrical apparatus for explosive gas atmospheres Part 1: General requirements (VIFC6C07S·C: 19S8) G/1435-2522 Transmission oil pool National body particle pollution level code 15) 44061999.MO0 GB/T1748S1HV9 wave calibration pollution analysis to collect filter samples from working system pipelines IDT1514021: 193) Coal mine machinery monthly pressure components general connection technical conditions ME/T459-19/
S core 217: 2002 Liquid transmission oil and pollution using optical microscope counting method to determine particle pollution Dongmanyu transmission using patrol light original automatic counting efficiency determination particle number pollution rack 15011500: 1997
3 technology Technical requirements
3.1 Data or documents
corresponding to the following data or documents.
The document should include the following relevant contents:
Principle of the hydraulic system:
Name, model and manufacturer of the hydraulic component; diameter and wall thickness of the hydraulic cylinder, specification and model of the hydraulic cylinder piston and plug rod; d
Displacement torque and rotation speed of the filter motor;
Displacement, speed and rotation direction of the shaft end of the pump; power, speed and type of the hydraulic pump monitoring unit; g
Pressure setting value of the pressure control device;
Type, flow rate and flow accuracy of the filter! i
Oil tank capacity:
Type of working oil:
Program table of electromagnetic and electric signal transmission device on, off and execution status; the resistance line (dot-dash load) of each oil circuit, m)
The performance of each type of components in each direction: the oil pressure and nominal capacity of each test point and oil drain port in the circuit; i
MTT776-2004
The marking of the oil port on the oil circuit block of all components (same as the marking on the components); the maximum flow rate of the cooling device, the heat exchange volume, the maximum pressure and the cooling temperature. 3.1.2 When there is a requirement for electronic control, the electrical control layout should be available, and the technical requirements for electrical control should be stated. 3.1.3
The layout diagram of the hydraulic system assembly pipeline.
When the hydraulic system assembly is installed, there should be a ground layout diagram and basic requirements: 3.1.4
The hydraulic system assembly undergoing resistance test and pressure test should have pressure test and pressure test reports, 3.1.5
3.1.6 After the cleaning test.
3.1.7 The hydraulic system assembly undergoing performance test should have a performance test report, sample operation and maintenance manual, which should comply with the provisions of G/$66-20015.7. 3.1.8
3.2 General requirements
3.2.1 The design requirements of the pressure transfer system shall comply with the requirements of 4.1-4.5 in GB/T3762001. 3.2.2
The sample design and technical document preparation shall comply with the provisions of relevant standards. The pressure relief sleeve shall be compatible with all optical components and materials used in the system to ensure the liquid discharge system clarity index. The solid particle pollution levels of oils used in various typical hydraulic systems shall comply with the requirements in GB/T11533-2002 and shall not exceed the requirements in Table 1. Table 1 Solid particle pollution level code
Hydraulic system
Proportional hydraulic system
High-pressure liquid
Medium-pressure liquid
Low-pressure liquid
Same version code
Ale/l3
717:14
/18:15
/19:16
The maximum flow rate of the liquid should generally be within the range specified in Table 2, and the flow rate will be reduced over a long period of time. Table 2 Flow rate
Calculation
Oil pressure range
Total range www.bzxz.net
2. 5~6.3 MPa
h. S--16 MPa
J6--31.5MT:
The actual oil circuit of the product should be consistent with the original system. Injection,tni.
0.5 ---, 5
2. 5 -- 3, 0
3. 0-.5. 0
4. (1~.5. a
=.5--3. 0
3.2.7 All components shall comply with the provisions of MT/T459-1995 and be consistent with the system design drawings. 3.2.8 A permanent label shall be provided to indicate the external oil port and the number of the electric milling machine, etc. 3.2.9 All pressed components and auxiliary parts shall have corresponding documents. 3.2.10 The specifications and materials of all pipes shall be consistent with the design sample. 3.3 3.3.1 The return oil pipe outlet should be at least 7200mm below the lowest liquid level of the oil tank, and the distance from the oil tank surface should be greater than ?-3 times the outer diameter of the return oil pipe, and the pipe end should be closed into a 43\ bevel. 3.3.2 The distance between the suction pipe and the oil tank should be greater than 3 times the suction oil diameter, and the outlet should be at least 250mm from the bottom of the tank, and at least 7 meters below the working surface. 1. 51mm1 item 1. Name diameter: 3.3.3 The appearance of the single-piece is flat. The internal welds of the box should be full and smooth, without any hidden holes. 3.4 Pipe fittings 3.4.1 The arrangement and direction of the pipes should be neat and consistent, with clear operation and easy maintenance. 3.4.2 The oil leakage type leading to the oil head should be perfectly controlled and the main oil return should be matched with the main oil return. MT/T 776—2004 3.4.3 The suction pipe of the liquid outlet pump should be as short and straight as possible to avoid interruption. 3.4.4 The external diameter of the pipe less than 42mm should be smooth and there should be no obvious wolf phenomenon (the length ratio should not be less than U.751 3.1.5. The pipes shall be stable and anti-vibration. Pipes shall not be used to support equipment and oil circuit boards. Pipes shall not be welded. The first and second supports shall comply with the provisions of G70-2061-9.3.1. 3.4.E The welding positions of all replacement parts shall be convenient for the inner wall of the weld. 3.4.7 Welding shall be avoided. The weld shall be smooth and even. There shall be no concave phenomenon inside. 3.4. During piping, the pipes shall be connected in a natural way. Loose and pull the head. When the pipes are connected, the temporary quantity of the main axis of the cabinet and the combination of the two sides shall comply with the provisions of Table 3. Table 3 Marriage and misalignment
Usually the outer diameter
Both joint surface extraction, m
Both relative joint surface movement weight, U:U
Both joint surface parallelism
16-·38
260~1c0
3.4.9 After the fitting is completed, the surface should be pickled and rinsed. The flushing requirements should comply with the provisions of CE/T37661-9.4. For pipelines that are not put into operation, the internal traces should be removed. 3.4.1D The fitting of the bone should comply with CB/15766-2 (iG1S.: Standard 3.4.11 All points that need to be monitored during commissioning, operation and troubleshooting should be replaced with small points 3. 4. 12
The system shall be provided with a reservoir sampling port. The representativeness of the collected oil sample shall be ensured. The end of the total return pipe shall be provided with the highest point of the sampling system and the dead point of the flow of the reducer shall be provided with an exhaust port. 3. 4. 13
3.5 Hydraulic system and motor
3.5.1 The setting of the hydraulic system and motor shall comply with the provisions of (iB/1376e30C1 5.:). 3.5.2 The hydraulic system and the prime mover shall have a certain rigidity. The relative rigidity and relative rigidity between the two shall comply with the requirements of the hydraulic system and the prime mover. 3.5.3 The hydraulic system and the drive device shall be installed with sufficient rigidity. The relative rigidity between the two shall comply with the requirements of the hydraulic system and the prime mover. The design and installation of the hydraulic pump shall comply with the provisions of Chapter 7 of B/T3766-2001. 3.7 The hydraulic pressure of the hydraulic pump shall comply with the provisions of Chapter 6 of GB/T76-2001. 3. 3.1 The setting of the hydraulic auxiliary equipment shall comply with the provisions of GB/T 3766-2CC1 e.3. 3.B.2 The filter setting shall comply with the provisions of GB/T3766-2001 8.3. 3.8.3 The setting of the heat exchanger shall comply with the provisions of G/T766-2021R, MT/T776-20Q4. 3.9 Structural parts
All structural parts shall be reasonably designed and the structure shall be stable. 3.10 Seals
All seals shall have valid period. 3.11 Control system
Control system shall comply with the provisions of GB/T3761-2001, Chapter 3. 2.12 Diagnosis and monitoring
Diagnosis and monitoring devices shall comply with the provisions of GB/T3761-2001, Chapter 11. 3.13 Test requirements
3.13.1 Resistance to corrosion and sealing test - The system assembly shall be free of corrosion and joint surfaces, and shall not be deformed or deformed due to water ingress. 3.13. 2
During the system operation test,
each prime mover and excitation system (including the standby system) shall start smoothly without abnormal noise or heat generation; the adjustment performance of the variable disk mechanism of each system (including the standby system) shall meet the requirements of the system design. h
3.13.3 Circuit performance test:
the performance of each circuit shall meet the design requirements;
the special performance of the system shall meet the requirements of the contract or technical agreement.hy
All kinds of electrical appliances, special equipment The action and signal should be combined with the charging requirements. All interlocks should be accurate and active. 3.14 Safety requirements
The small energy-saving assembly used underground in coal mines should meet the following safety requirements:) The electrical equipment used for fire protection should have a "product qualification certificate", the "fire protection standard qualified" issued by the national designated fire protection inspection personnel and the "safety mark certificate" issued by the national designated machine! The aluminum alloy materials and non-metallic materials should comply with the relevant provisions of GB3836.12000. 5
3.15 Painting| |tt||3.15.1 Before installation, all external fitting surfaces and non-matching surfaces should be painted with anti-rust paint or treated with surface anti-rust treatment: 3.15.2 Before installation, all fitting surfaces and surface matching surfaces should be painted with anti-rust paint. 3.15.3 The original surface should be uniform and smooth. The color should be good. 4 Test method
The pressure system assembly installed in the upper machine and the machine leaving the factory should be tested according to the relevant test methods of the main machine. Other pressure system assemblies should be tested according to the test methods specified in this standard. All pressure system assemblies should be tested page by page according to the test methods specified in this standard. The system assembly shall be subjected to an economic inspection. 4.1 Pressure test and sealing test 4.1.1 The test results of the pressure test and sealing test shall comply with the requirements of Table 1. Table 4 Test pressure 25-P31, 35MPa, 31.5MPa, 31.5MPa 4.1.2 During the test, the pressure shall be high. After reaching the test pressure, the pressure shall be maintained for a long time. Observe whether the system assembly meets the requirements of 3.33.1. 4.2 Performance test 4.2.1 Residual running performance test: The reverse running performance test shall be carried out according to the above method: The test shall be carried out according to whether each engine and pump (including standby pump) meets the requirements of %.19.2. 5) Test whether the performance of each system (including spare variable machines) meets the requirements of 3.13.2. 4.2.2 International variable performance test:
MT/T 776—2004
The same circuit performance test should be carried out according to the following method: Change the operating unit, check the performance of each circuit: Repeat the test 3 times for each valve within the required setting range, check whether the performance of each circuit meets the requirements of 3.19, 4, and if there is a failure, eliminate the fault and repeat the test 6 times to ensure that the performance is correct. h Test whether other special performances of the system meet the requirements of 3.13. 4.2.3 Check the position control and alarm, oil temperature control and zero alarm, positive relay And other special sensors and signals are up to 3.15, 4 drug regulations
4.3 Dijiemo inspection
3.1 received word:
oil sampling standard Beijing standard GB/171R9-199% regulations: 4.3.2, inspection method:
should be carried out according to one of the methods specified in 5044072002, use optical microscope 1 counting method to detect the sample effect pollution ticket level is in line with the provisions of 2.2.4;
6 vibration according to I5011500: 1777 specified method, use the automatic counting method to detect whether the oil ladder particle control pollution level meets the provisions of 4
5 inspection rules
5.1 hydraulic system assembly should be inspected by the quality inspection department! Technical 4 standard, rush to pass the cold before leaving the factory. 5.? The pressure system assembly belongs to one of the following conditions: a) the required aging items have not been completed, so the inspection cannot be continued; b) the test is sensitive to the disease, the three key parts are damaged during the inspection: ) although the inspection items are completed or not in compliance with the requirements or the inspection is concluded, the inspection items will be returned to the state for inspection. 6 Marking, packaging and transportation
6.1 Marking
6, 1.1 Each component should be numbered: the component number should be consistent with the system installation period and the reputation of the country. The component number or the replacement number of each component should be on the component
5.1.2 The component holes, including the pilot hole, the test port and the oil drain port, should be clear and consistent with the return reason 1.
6.1.3 On the gas and pressure point system diagram, the electric probe cover should be marked. 5.1.4 The plug-in source and other control components (damping, shuttle, palm discharge) in the circuit board should be marked near the inspection door. When the inspection port is located under one or more components, it should be marked near the component for identification and marked with "inside the column". 6.1.5 Imported components should be marked in Chinese. 6.2 Packaging and transportation
5.2.7 For the sake of reliability, when the system needs to be disassembled, the general circuit and pipe heads should be clearly marked. 6.2.2 All equipment should be installed in good condition to prevent damage, deformation, contamination and maintenance, and keep its identification mark. 6.2.3 The exposed port of the pressure pump should be sealed before the case is sealed, and the external frequency effect and the joint surface of the device should be protected during the shipment. 6.2.1. The components with adjustment mechanism are in safe or effective state. After the adjustment, the components that have been adjusted should be marked and indicated. 6.2.5
6.2.6 Release the oil in the system, the cooling water in the non-clean system, and the nitrogen in the energy device should be released to 0.5-0.5Mz.; 6.2.8 The packaging should have sufficient strength and strength, and reliable rain protection measures should be taken. 6.2.9 The equipment should be fixed to the bottom of the complex, and the packaging box structure should be easy to load and lift.
The packaging box is clearly marked on the outside: center of gravity, lifting point, upward, anti-agent caution and shipping date, etc. The packaging is as follows:
Packing list:
The qualified system assembly is inspected!
Factory inspection certificate;
Provide technical documents for the user, the contents of which should comply with the provisions of 3.1, explosion-proof parts, spare parts, special tools, lifting tickets and anchor screws: "Product Certificate\copy" of explosion-proof electrical equipment, "Explosion-proof Certificate\Reply" and "Coal Mine Product Safety Mark Official Examination" copy.
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