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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces MT/T 689.2-1997 Plough - Specification of type inspection and MT/T 689.1-1997 Plough - Specification of routine inspection. This standard is developed by reference to MT/T 689.2-1997 and integrating relevant contents of MT/T 689.1-1997. The following main technical changes have been made with respect to MT/T 689.2-1997:
—— the standard name is modified (see the cover of this standard, and the cover of Edition 1997);
—— the requirements that shall be met are deleted (clause 4 of Edition 1997);
—— the conditions required for inspection are added (see clause 3);
—— the contents are modified for the test of land-based whole machine of the plough (see clause 4.1 of this standard, and clause 5 of Edition 1997);
—— the idling noise determination test of gearing of coal ploughing unit is added (see Table 2, S.N.2);
—— the determination of motor power P consumed during no-load operating of the coal ploughing unit is added (see Table 2, S.N.3);
—— the number of test is modified for electronic control system (see Table 3, S.N.2, and 5.2.9 of Edition 1997);
—— the number of test is modified for electronically-controlled safety protection system (see Table 3, S.N.3, and 5.2.10 of Edition 1997);
—— the speed switching test of plough with dual-speed function is deleted (5.2.10.3 of Edition 1997);
—— the test on spray dust suppression system is added (see Table 3, S.N.4);
—— the plough head traction testing is deleted (5.2.6 of Edition 1997);
—— the inertia test of the plough head is deleted (5.2.7 of Edition 1997);
—— some contents of the simulated coal wall ploughing test are deleted (5.3.4 ~ 5.3.7 of Edition 1997);
—— the reducer test on the coal ploughing unit is modified (see Table 1, S.N.2, and clause 6 of Edition 1997);
—— the “industrial test” is added (see 4.3);
—— the "inspection rules” is added and included the contents of the "judgment rules” in previous standard (see clause 5 of this standard, and clause 8 of Edition 1997);
—— the type inspection object is modified (see 5.3 of this standard, and clause 3 of Edition 1997);
—— the requirements are modified for measuring errors of instruments and meters for inspection (see Annex A of this standard, and clause 9 of Edition 1997);
—— references and record list for noise measurement are deleted (Annexes A and B of Edition 1997);
—— no-load power conversion is added between actual laying length and design laying length of the plough (see Annex B).
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. Issuance organization of this standard shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by the Science and Technology Development Department of China National Coal Association.
This standard is under the jurisdiction of the National Technical Committee on Coal Equipment of Standardization Administration of China.
This standard replaces MT/T 689.1-1997 and MT/T 689.2-1997.
MT/T 689.1-1997 and MT/T 689.2-1997 were firstly issued in December 1997.
Plough - Specification of inspection
1 Scope
This standard specifies the conditions required for inspection, inspection items, test methods, requirements and inspection rules for static plough (hereinafter referred to as “plough”) used in the working surface of longwall coal mining.
This standard is applicable to the end-of-manufacturing inspection and type inspection of plough used in the working surface of longwall coal mining.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 3836.1 Explosive atmospheres - Part 1 : Equipment - General requirements
GB 3836.2 Explosive atmospheres - Part 2: Equipment protection by flameproof enclosures “d”
GB 3836.3 Explosive atmospheres - Part 3: Equipment protection by increased safety “e”
GB 3836.4 Explosive atmospheres - Part 4: Equipment protection by intrinsic safety “i”
GB/T 12718 High-tensile steel chains (round link) for mining
GB/T 24503-2009 Mining-drive sprocket for chains (round link)
MT/T 71 Shackle type connector units for mining round link chain
MT/T 72 Scraper bars for the twin outboard chain conveyors
MT/T 99 Flat type connector units for mining round link chain
MT/T 101 Inspecting specification for gearbox of chain conveyors
MT/T 102 Testing specification for middle slot of scraper conveyors
MT/T 103-1995 Specification of end-of-manufacturing inspection for scraper conveyors for mining
MT/T 104-1993 Specification of type inspection for chain conveyors
MT/T 152 Scraper bar for central single scraper conveyor
MT/T 183 Middle slot of scraper conveyors
MT/T 208 Hydraulic coupling for scraper conveyor
MT/T 323 Flight bar for twin inboard chain face conveyor
MT/T 1118 Plow tip and plow guide for sliding plow
3 Conditions required for inspection
3.1 The electrical equipment of the plough shall meet the requirements of GB 3836.1~GB 3836.4, and shall have the Explosion-proof Certificate issued by the explosion-proof department approved and authorized by the State and the safety certificate of approval for mining products issued by organization designated by the State.
3.2 The main parts of the plough, including the coal ploughing unit, the conveying unit, and the control system, shall be assembled before inspection.
3.3 The main parts and components of the plough shall meet the requirements specified in Table 1. The whole machine may only be inspected after other parts and components have passed the separate inspection, and the parts and components will not be inspected during the whole machine inspection.
3.4 All products such as standard parts and purchased parts for plough shall have product certificates.
3.5 The sensors, measuring instruments and recording instruments used for measurement shall have periodic inspection certificates. The measuring accuracy of various parameters shall meet the requirements specified in Annex A.
Table 1 Requirements for main parts and components of plough
S.N. Parts and components of plough Requirement
1 Moment-limiting overload protective device The limit value of transmission torque shall meet the design requirements.
2 Reducer of coal ploughing unit
Reducer of conveying unit It shall meet the requirements of MT/T 101
3 Sprocket It shall meet the requirements of GB/T 24503-2009
4 Hydraulic coupling It shall meet the requirements of MT/T 208
5 Round link chain It shall meet the requirements of GB/T 12718
6 Shackle type connector unit It shall meet the requirements of MT/T 71
7 Flat type connector unit It shall meet the requirements of MT/T 99
8 Middle slot It shall meet the requirements of MT/T 102 and MT/T 183
9 Twin outboard chain scraper It shall meet the requirements of MT/T 72
10 Central single chain scraper It shall meet the requirements of MT/T 152
11 Twin inboard chain scraper It shall meet the requirements of MT/T 323
12 Plough head and plough guide They shall meet the requirements of MT/T 1118
4 Inspection items, test methods and requirements
4.1 Land-based whole machine inspection of plough
4.1.1 Test conditions
Horizontally lay the plough in a straight line on the concrete floor with the laying length not less than 60 m. Supply power and cooling water and use specified grease and hydraulic oils according to the design requirements.
4.1.2 Inspection of coal ploughing unit
See Table 2 for the inspection items, test methods and requirements for coal ploughing unit.
Foreword i
1 Scope
2 Normative references
3 Conditions required for inspection
4 Inspection items, test methods and requirements
5 Inspection rules
Annex A (Informative) Requirements for measuring accuracy
Annex B (Normative) No-load power conversion between actual laying length and design length of plough
