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GB 25974.2-2010 English PDF

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GB 25974.2-2010: [GB/T 25974.2-2010] Powered support for coal mine -- Part 2: Specification for power set legs and rams
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GB 25974.2-2010English679 Add to Cart 5 days [Need to translate] [GB/T 25974.2-2010] Powered support for coal mine -- Part 2: Specification for power set legs and rams Valid GB 25974.2-2010

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GB/T 29723.5   GB/T 10605   MT 76   GB/T 35056   GB 25974.1   

Basic data

Standard ID GB 25974.2-2010 (GB25974.2-2010)
Description (Translated English) [GB/T 25974.2-2010] Powered support for coal mine -- Part 2: Specification for power set legs and rams
Sector / Industry National Standard
Classification of Chinese Standard D97
Classification of International Standard 73.100
Word Count Estimation 26,295
Date of Issue 2011-01-10
Date of Implementation 2011-06-01
Quoted Standard GB/T 197-2003; GB/T 228; GB/T 229; GB/T 1184-1996; GB/T 1804-2000; GB/T 2649; GB/T 2650; GB/T 2651; GB/T 2652; GB/T 2653; GB/T 2828.1-2003; GB/T 2829-2002; GB/T 3452.1; GB/T 3452.3; GB 3836.1-2000; GB/T 6394-2002; GB/T 11352; GB/T 12361; GB/T 12467.1; GB/T 12467.2; GB/T 12467.3; GB/T 12467.4; GB/T 12467.5; GB/T 13306; JB/T 3338.1; MT 76
Adopted Standard EN 1804-2-2001, NEQ
Regulation (derived from) Announcement of Newly Approved National Standards No. 1 of 2011 (No. 166 overall)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Chinese standard specifies the coal mine hydraulic support leg and jack of terms and definitions, requirements, test methods, inspection rules, marking, packaging, transport and storage. This standard applies to coal mine hydraulic support leg and jack.

GB 25974.2-2010: [GB/T 25974.2-2010] Powered support for coal mine -- Part 2: Specification for power set legs and rams


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Powered support for coal mine.Part 2. Specification for power set legs and rams ICS 73.100 D97 National Standards of People's Republic of China Coal mine hydraulic support Part 2. Jack post and technical conditions Part 2. Specificationforpowersetlegsandrams Published 2011-01-10 2011-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued

Table of Contents

Introduction Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative References 1 2 3 Definitions 4 requires 2 4.1 General requirements 2 4.2 assembly quality in claim 3 4.3 4 major components required 4.4 Plating claim 4 4.5 Performance Requirements 4 4.6 Performance Materials 6 Test Method 5 6 5.1 Test conditions 6 5.2 General requirements 7 5.3 assembly 7 and appearance 5.4 The main components 7 5.5 plating 7 5.6 Performance Test 7 6 Inspection Rules 10 6.1 Inspection Classification 10 6.2 Test item 11 6.3 Batch rules and sampling program 11 6.4 decision rule 13 7 signs, packaging, transportation and storage 13 7.1 marks 13 7.2 Packaging 13 7.3 Transport 13 7.4 Storage 14 Annex A (normative) cylinder plating layer specification Part 15 Allowable stress Annex B (normative) hydraulic cylinders 17 and static analysis

Foreword

This part of 4.2, 4.5 and 4.6 are mandatory, the rest are recommended. GB 25974 "coal mine hydraulic support" is divided into the following four parts. --- Part 1. General requirements; --- Part 2. Jack post and technical conditions; --- Part 3. valve and hydraulic control system; --- Part 4. Technical requirements electro-hydraulic control system. This is Part 2 GB 25974, which corresponds to European standards EN1804-2.2001 "Safety requirements of hydraulic support 2 Points. leg and jack. " This portion EN1804-2.2001 non-equivalent degree of consistency, the main differences are as follows. --- assembly quality requirements increase, the main components required, electroplating requirements, cylinder burst properties (see 4.2,4.3,4.4,4.5.12); --- increased inspection rules (see Chapter 6). Appendix A of this section is normative, Annex B is an informative annex. This section is proposed and managed by the China Coal Industry Association. This section is drafted. CCRI mining Design Research Branch. Participated in the drafting of this section. Detection Research Branch Coal Research Institute. The main drafters of this section. Kingdom law, Zhao Zhili, Fu Jingyu, ginger Golden Globe, Sun Guiying, Du Zhongxiao, Wang Xiaodong.

Introduction

MT313-1992 "hydraulic support column technology" and MT97-1992 "Jack hydraulic support technology" has been implemented more than 10 Years, has played an important role in guiding our hydraulic support leg and jack design, production and testing process. As science and technology Advances in technology exchange and market competition intensifies worldwide and, MT313-1992 and MT97-1992 has been difficult to adapt to the market Demand, and the current foreign advanced standards (eg EN standards) there is a gap, especially the development of national standards with the international advanced standards. In the standard-setting process, given the current actual situation, manufacturing, testing features and technical level of China's pillar and jack Conditions, taking into account the need for standards and foreign standards and the development of this standard to develop our leg and jack design, testing and use of research Study based on the results, and extensive reference to the relevant standards of the major coal-producing countries and international organizations in the world. Coal mine hydraulic support Part 2. Jack post and technical conditions

1 Scope

GB 25974 This section specifies the terms and definitions coal hydraulic jack and support column, requirements, test methods, testing gage Then, signs, packaging, transportation and storage. This section applies to coal with hydraulic support leg and jack.

2 Normative references

Terms of the following documents constitute provisions of this section by reference in this part of GB 25974. For dated reference documents Pieces, all subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encouraged to reach under this section Whether the parties to the agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 197-2003 common thread tolerance (ISO 965-1.1998, MOD) GB/T 228 materials at ambient temperature tensile test method (GB/T 228-2002, eqvISO 6892.1998) GB/T 229 metal material Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD) GB/T 1184-1996 shape and position tolerances without individual tolerance value (eqvISO 2768-2. 1989) GB/T 1804-2000 General tolerances for linear and angular dimensions are not tolerance tolerance injection (eqvISO 2768-1. 1989) GB/T 2649 Mechanical properties of welded joints Test Methods of sampling GB/T 2650 welded joints Impact test methods (GB/T 2650-2008, ISO 9016.2001, IDT) GB/T 2651 welded joint tensile test method (GB/T 2651-2008, ISO 4136.2001, IDT) GB/T 2652 and deposited weld metal tensile test method (GB/T 2652-2008, ISO 5178.2001, IDT) GB/T 2653 Method of bend test welded joint (GB/T 2653-2008, ISO 5173.2000, IDT) GB/T 2828.1-2003 Sampling procedures - Part 1. Test batches by sampling the reception quality limit (the AQL) search Plan (ISO 2859-1.1999, IDT) GB/T 2829-2002 Sampling procedures and test cycle forms (for inspection of process stability) GB/T 3452.1 hydraulic pneumatic rubber O-ring Part 1. dimensions, tolerances (GB/T 3452.1-2005, ISO 3601-1.2002, MOD) GB/T 3452.3 hydraulic pneumatic rubber O-ring groove dimensions (GB/T 3452.3-2005, ISO 3601-2.1999, MOD) GB 3836.1-2000 explosive gas atmospheres Electrical Equipment Part 1. General Requirements (eqvIEC 60079-0.1998) GB/T 6394-2002 average grain size of the metal assay GB/T 11352 Carbon steel castings for general engineering (GB/T 11352-2009, ISO 3755.1991; ISO 4990.2003, MOD) GB/T 12361 General technical steel die forgings GB/T 12467 (all parts) of a metal material welding quality requirements (GB/T 12467.1 ~ 12467.5-2009, ISO 3834-1 ~ 3834-5.2005, IDT) GB/T 13306 signs JB/T 3338.1 cylindrical helical compression springs hydraulic technical conditions MT76 hydraulic support (pillar) emulsified oil, and high concentrate aqueous hydraulic fluid

3 Terms and Definitions

The following terms and definitions apply to this part of GB 25974. 3.1 Hydraulic cylinder actuator A reciprocating linear motion by a hydraulic drive. 3.2 Column legs Almost vertical arrangement, the holder supporting force generating cylinder. 3.3 Telescoping Multi multitelescopiclegs More than one telescopic post stroke. 3.4 Jack rams Its function for the stent, the stent does not produce a hydraulic cylinder supporting force. 3.5 Support jack supportrams For generating an auxiliary bracket support force balancing hydraulic cylinders or jacks ball hinge. 3.6 Fluid supply pressure settingpressure Hydraulic system pressure is supplied to the hydraulic cylinder. 3.7 Rated working pressure maximumpermissibleworkingpressure The maximum design pressure of the hydraulic cylinder can work properly. 3.8 Rated force ratedforce At ignoring friction, the resultant force calculated hydraulic cylinder rated working pressure. 3.9 Let pressure yielding Causing the pressure relief valve opening force exceeds the pressure of the hydraulic cylinders of varying lengths.

4 Requirements

4.1 General requirements 4.1.1 No individual tolerance No part patterned metal machining tolerances Note should meet the following requirements. a) No injection dimensional tolerance limit deviations metal cutting pattern parts shall comply with GB/T 1804-2000m stage, no means With relations should be consistent with the provisions of GB/T 1804-2000c level; b) a metal cutting pattern parts without individual tolerance limit of the angle deviation should comply with GB/T 1804-2000c stage; c) a metal pattern non-cutting parts Note geometric tolerance limit deviation should meet the requirements GB/T 1184-1996K stage. 4.1.2 Pressure Weld To withstand the liquid pressure of the weld should be able to withstand 200% of the rated working pressure of the hydraulic cylinder, the leakage test should 5min. 4.1.3 Forging Steel castings shall comply with GB/T 11352 of. Forgings shall comply with GB/T 12361 of. 4.1.4 Other elements Hydraulic helical springs shall comply JB/T 3338.1 is. Common threads shall comply with GB/T 197-2003 6,7 stage (6 external threads, internal threads 7) requirements. Rod coating quality in the absence of specific requirements should be consistent with the provisions of Appendix A. O-ring and groove dimensions should be consistent with GB/T 3452.1, GB/T 3452.3 requirements. 4.1.5 Lifting point Cylinder is provided with suitable lifting points, the set of lifting points should be able to withstand 4 times the lifting force of the weight without damaging. 4.1.6 valves and safety devices And a support pillar jack should be fitted with safety devices to prevent the pressure exceeds the allowable value, the safety valve and means for fixing the charged shall mean not occur External action. 4.1.7 working solution Hydraulic cylinder fluid should meet the requirements of the MT76. 4.1.8 Welding Welding operations comply with the requirements and quality (all parts) of the GB/T 12467. 4.1.9 calculated allowable stress and static forces Parts allowable stress and static calculation see Appendix B. 4.2 assembly quality requirements 4.2.1 Assembly and appearance Assembly and appearance quality should meet the following requirements. a) prior to assembly, all parts of the respective surfaces of the burrs, chips, oil, etc. to be cleaned; b) when assembled, the mating surface should not damage the part, all the threads should be coated thread antirust grease; should be carefully checked whether or cylinder seal old Of, undercut, defects such as creasing, and strict attention to the presence or absence of seal extrusion and tear in the cylinder grooves or the like, if in the above Phenomenon, should be replaced immediately; c) a hydraulic cylinder assembled, it should be reduced to a minimum state, and shall forward all, with a plastic plug seals the liquid return port; d) after assembly (except the outer surface of the outer surface of the cylinder rod) should be sprayed or painted design requirements antirust primers and topcoats. Paint shall have Uniform, with a solid, there should be no peeling off phenomenon. 4.2.2 Cleanliness After passing the test cylinder to be removed for cleaning, after washing impurities should not exceed Table 1, the value listed in Table 2 or Table 3. Table 1 Single telescopic (including mechanical extension section) impurity content table column Bore/mm column length/mm impurities/mg < 200 The maximum length of < 200 040 2000≤ length < 400045 The maximum length of ≥4000 50 ≥200 The maximum length of < 200 045 2000≤ length < 400050 The maximum length of ≥4000 55 TABLE 2 Double Telescoping impurities table Bore/mm column length/mm impurities/mg < 200 The maximum length of < 200 060 2000≤ length < 400065 The maximum length of ≥4000 70 ≥200 The maximum length of < 200 065 2000≤ length < 400070 The maximum length of ≥4000 75 Table 3 and the impurity content of the jack support jack Bore/mm jack length/mm impurities/mg ≤100 The maximum length ≤1000 25 1000 < Maximum length ≤4000 30 > 100 The maximum length ≤1000 30 1000 < Maximum length ≤4000 40 4.3 The main components required 4.3.1 cylinder Sealing engagement with the inner wall of the cylinder tube face dimensions substantially deviation is H, tolerance levels should not be less than IT9. Cylinder inner wall surface roughness of the sealing surface of the mating Ra≤0.4μm. 4.3.2 piston rod The basic dimensions of the rod seal mating surfaces deviation is f, the tolerance level not lower than IT8. Ra≤0.4μm piston sealing surface roughness of the mating surfaces. 4.3.3 bottom valve (column only) The valve body, the valve should be made of stainless steel manufacturing. Ra≤0.4μm sealing surface roughness of the mating surfaces. When the bottom valve open, the post should not appear whistle, shock or creeping phenomenon. Electroplating requires 4.4 4.4.1 plating parts The following parts should be plating. a) an outer surface of the piston rod; b) contacting the working fluid in the easy parts affected cylinder performance. Such as. the half-rings, the platen, the guide sleeve, retaining sleeve, piston, key cards and the like. 4.4.2 plating No specific requirements of the plating should comply with the quality of Appendix A. All galvanized plated should passivation treatment. 4.5 Performance Requirements 4.5.1 sealability When the cylinder seal tests loading, locking pressure chamber, the pressure chamber should not exceed 10% of the pressure drop or longer in the first hydraulic cylinder 1min The degree of variation of less than 1%, or length within 5min after the constant pressure, the pressure within 5min next drop should not exceed 0.5%, or the length Change is not more than 0.05%. 4.5.2 No-load stroke Cylinder load, there should be no full telescopic stroke stagnation and, crawling and extravasation. 4.5.3 minimum start-up pressure In the no-load condition the column back pressure, piston chamber pressure should be started is less than 3.5MPa, the rod chamber starting pressure should be less than 7.5MPa. In the no-load condition jack back pressure, threshold pressure piston chamber and the piston rod chamber should be less than 3.5MPa. 4.5.4 rod chamber sealing performance The hydraulic cylinder piston rod chamber in the liquid supply 2MPa and 1.1 times the pressure should not leak outside. 4.5.5 let pressure performance Pillar and support jack should have the ability to support while in motion, has let the pressure characteristics. --- center allows pressure force measured normal force should be less than 1.1 times and not lower than the rated power; --- eccentric force measured so that the pressure should not exceed 110% of the center so that the maximum pressure in the measured force, and not less than the rated power. 4.5.6 Performance Center Overload Overload Performance Center include. --- uprights (including extension section) and the support jack should withstand 1.5 times the rated force by the static load and dynamic load reaches a mechanical impact 1.5 times the rated working pressure, no functional failure occurs, the residual deformation of the cylinder diameter is less than 0.02% bore; --- upright without support by mechanical impact and dynamic loads jack should be able to withstand a force of 2 times the rated pressure static load. Load Test Thereafter, the jack no longer consider the support pillar and features, but a base material should not crack, nor Weld Crack generation; --- dynamic loads without support by mechanical impact jack should be able to withstand a force of 2 times the rated static load force; And a support pillar --- fully retracted state jacks shall withstand twice the normal force, there should be no plastic deformation after the test; --- jack with 1.5 times the function failure should occur when the rated working pressure of tension or rated. 4.5.7 Eccentric loading performance Column (including extension section), and an eccentric force is supported in the jack and (or) a lateral force, there should not function fails, the transition between stages Deflection should be less than 0.1% of the length of the test. 4.5.8 Durability Column (including extension section) and the support jack loading cycle after 21,000 times, functional failure should not occur. Jack after 10,000 loading cycles, functional failure should not occur. 4.5.9 outrigger limit And a support column extending jacks rated working pressure to the interior of the stopper 1, at least stay 3min, should not damage the internal stopper. And a support pillar jack with at least 0.8 times the rated pressure extends into the interior of the stopper 100, the stopper should not damage the interior. If liquid Pressure system has a pressure higher than 0.8 times the rated work pressure, and a support pillar jack 100 should extend at higher pressures, the internal gear Block shall not be damaged. When a supported condition to pull jack 1.5 times rated tension against the inside of the stopper is pulled out, should not damage the support jack. Jack contact with the inside piston extends outward stopper jack to withstand 1.25 times the rated pressure, the test should not be Function failure. Note. The internal part of the stopper to the stopper guide sleeve is like. 4.5.10 Function And a support column in the finished jack performance test above, but starting from the fully extended so that the full stroke retracted loading was measured to be less than effective And not more than the rated power so that the center of pressure measured force 4.5.5 1.1 times; 0.8 times the rated pressure can be fully retracted, and through 4.5.1 Sealing performance requirements. 4.5.11 cylinder connecting point A hydraulic cylinder (including the extension section) and the force-transmitting member is connected to be able to withstand 1.5 times the normal force, there should not be ineffective. 4.5.12 cylinder burst performance 4.5.12.1 Where one of the following conditions should be the cylinder burst test. a) use of new cylinder material; b) the first time the series bore. Blasting specimen material, the cylinder wall thickness, the outer diameter of the nominal size should be tested with the hydraulic cylinder of the cylinder requires the same, which allows shorter length, but Table 4 should not be less than required. Table 4 cylinder specimen length in millimeters Length of the test cylinder hydraulic cylinders > 1000 ≤1000 The shortest length of the test piece 1000 500 After 4.5.12.2 cylinder blast, brittle failure should not occur. 4.6 Material Properties 4.6.1 Steel 4.6.1.1 General performance When the material stress reaches the calculated allowable stress of 90%, the tensile strength of the steel used for the cylinder is not less than 1.08 times the electrode yield 0.2% residual deformation limit or limits. The elongation at break of the steel used δ5 not less than 10%. 4.6.1.2 welded steel parts Steel according to GB/T 6394-2002 grain size measured level not lower than 6; at -20 ℃ notch impact energy which shall not be less To 27J. 4.6.1.3 Non-welded steel parts Non-welded steel cylinder with a predetermined cylinder 4.6.1.1 and 4.6.1.2 should meet. When other non-welded steel parts at 20 ℃ notch impact energy of not less than 25J. 4.6.2 light metal The outer surface of the gas used in mines there is danger in the hydraulic cylinder, the GB should not be used in Chapter 8 of the light metal 3836.1-2000 --- or a light metal alloy comprising a coating and plating. 4.6.3 Other materials Other parts of the cylinder material should meet the requirements of 4.6.1.1; non-metallic material should meet GB 3836.1-2000 Chapter 7 Requirements.

5 Test methods

5.1 Test conditions 5.1.1 working solution Working fluid using emulsified oil or concentrate with a mass ratio of 5.95 by neutral soft high water formulated hydraulic fluid under MT76. 5.1.2 Pressure fluid temperature During the test the temperature control fluid (10 ~ 50) ℃, the working fluid using 40μm filter accuracy, and should be provided with the magnetic filter Device. 5.1.3 Level measurement accuracy and measurement system errors Using grade C measurement accuracy, the measurement error of the system allows to comply with Table 5. Table 5 allows the systematic errors of the measurement system Measurements Level A Class B C Pressure error (gauge pressure ≥0.2MPa) /% ± 0.5 ± 1.5 ± 2.5 Flow error /% ± 0.5 ± 1.5 ± 2.5 Temperature error/℃ ± 0.5 ± 1.0 ± 2.0 5.2 General requirements 5.2.1 Pressure Weld The hydraulic pressure of cylinder weld after welding of all, with the tooling cylinder top tight sealed ends, the cylinder bore pressure to 200% of rated voltage Force, pressure 5min. This test allows the hydraulic cylinder assembly. 5.2.2 Lifting point Load lifting points vertically stretched 4-fold by a tensile weight lifting. The test also allows the disposable test mode by, for example, a Comparison may be performed on a specimen thereof. 5.3 Assembly and appearance 5.3.1 assembly quality and appearance Assembly quality and appearance and use common gage special measuring instrument under daylight or normal light inspected. 5.3.2 Cleanliness Removing the cylinder after passing the test cleaning solution is collected after cleaning accuracy equivalent to 40μm filters, the resulting network Drying the article by weighing, the mass of the impurity mass. 5.4 The main components When the valve before the end of the test column, the column extending to the bottom valve is opened to supply hydraulic pressure to the end of the valve continuously open, fully extended live column, The rod chamber into the liquid column, the column reduced to a minimum. 3 cycles, by tactile inspection and heard; other conventional methods. 5.5 Plating Conventional methods. 5.6 Performance Test 5.6.1 sealability The test shall be loaded on the fixed valve, a safety device, the seal and the cylinder hydraulic pressure in the joint and the extension rod. Seal test (rear) locking pressure chamber when the hydraulic cylinder is loaded, continuous measurement of the pressure chamber and the pressure in the stroke 11min, the recording of the hydraulic cylinder Stroke or pressure changes over time, and expressed by a line in FIG. 1min taken before and after 5min before the test if performed 3min 2min. NOTE. the various sealing pressure is the pressure value when the loading situation. 5.6.2 No-load stroke Cylinder load, the moving speed is not greater than 200mm/min operating conditions, the full reciprocating stroke 3 times. 5.6.3 The minimum start-up pressure Column backpressure no-load condition, respectively, of the piston chamber and the rod chamber is gradually raised to full stroke Movable column, recording levels cylinder upper chamber Pressure chamber and start. Column Column live fully retracted, holding the cylinder supply hydraulic pressure to the rod chamber, the rod chamber vat gradually boost the cylinder so that motion, which records the cylinder When the guide sleeve portion by vat, vat starting pressure piston chamber. Jacks and load supporting jacks no back pressure conditions, respectively, the piston chamber and the rod chamber is gradually raised to the full stroke of the piston rod Moving the recording starting pressure piston chamber and the piston rod chamber. 5.6.4 rod chamber sealing performance Column as to minimize the height of the rod chamber and 2MPa plus 1.1 times the liquid supply pressure, the blocking seal cavity regulator 5min. Jack as to minimize the height of the rod chamber and 2MPa plus 1.1 times the liquid supply pressure, the blocking seal cavity regulator 5min. 5.6.5 let pressure performance 5.6.5.1 Performance Center presser 5.6.5.1.1 compression presser Jack post or all of the outer support extension, the safety valve opening pressure is adjusted to the rated working pressure, the test under the following conditions. a) with (10 ± 2) mm/min speed, twice the stroke of 100mm so that pressure test; b) with the (2 ± 1) mm/min speed, twice the stroke of 20mm so that the test pressure; c) Multistage column at a level converter (10 ± 2) mm/min speed, twice let 100mm stroke pressure test. 5.6.5.1.2 stretch presser The stretched support jack presser Yaoan compression method so that a tensile and compression testing. 5.6.5.1.3 speed presser When the support jack in work have a higher velocity, at a higher speed so that pressure test. Records Center during the presser force and pressure changes over time. 5.6.5.2 eccentric presser By the amount of eccentricity of FIG. 1 or FIG. 2, using the same test method 5.6.5.1, only the eccentric load, so that the pressure recording during the eccentric force And pressure changes over time. Note. Only the support column and jack were let pressure test. FIG eccentrically loaded column 1 FIG 2 is loaded eccentrically supporting jacks 5.6.6 Performance Center Overload 5.6.6.1 1.5 times the rated load compression Inner or outer loading test load. a) an outer loading step. 1) with 0.8 times the nominal worki...

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