This standard specifies the requirements, test methods, inspection rules, marking, packing, transport and storage of belt conveyor idlers for coal mines.
This standard is applicable to belt conveyor idlers for coal mines.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 10595 "General Specification for Belt Conveyors" (neq DIN 22112:1985)
MT 113 "General Test Methods and Judgment Rules for Fire-resistant Antistatic Properties of Polymer Products for Coal Mines"
MT/T 655 "Technical Condition of Belt Conveyor Idler Bearing for Coal Mining"
MT/T 1019-2006 "Technical Specification of Idler Body for Coal Mines"
"Safety Regulations in Coal Mine" State Administration of Work Safety (2004)
3 Requirements
3.1 General requirements
Idlers shall be manufactured according to drawings and technical documents approved through established procedure.
3.2 Service conditions
3.2.1 Ambient temperature shall be -10~+40℃.
3.2.2 The composition of underground air shall meet the requirements of Article 100 in "Safety Regulations in Coal Mine" (2004 edition).
3.2.3 Water spraying condition is allowed in the working environment.
3.2.4 Idlers shall be capable of adapting normal collision conditions in handling and installation process.
3.3 Requirements for parts
3.3.1 Pipe body
The pipe body may be of metallic or nonmetallic material, and its quality performance indexes shall meet the requirements of MT/T 1019-2006.
3.3.2 Bearing block
3.3.2.1 Bearing block may adopt iron casting or pressing. The mechanical and physical properties of iron casting materials shall not be less than HTl50; the mechanical and physical properties of pressing materials shall not be less than those of 08F quality carbon steel; and the nominal thickness shall not be less than 3mm.
3.3.2.2 The inside diameter tolerance of bearing hole of bearing block shall be M7.
3.3.3 Bearing
The bearing shall preferentially adopt KA series of dedicated idler bearing and meet the requirements of MT/T 655, and it may also adopt other deep-groove large-play bearing, and its performance shall meet the requirements of the relevant national standard.
3.3.4 Idler shaft
The mechanical and physical properties of idler shaft materials shall not be less than those of Q235-A steel. The outside diameter tolerance of idler shaft and bearing assembly part shall be js6.
3.3.5 Sealing device
3.3.5.1 The sealing end face of the sealing element shall be free from such defects as crack, scratch and air hole.
3.3.5.2 The sealing device shall be provided with good sealing performance and capable of effectively preventing coal dust and water entering into bearing.
3.3.6 Lubricating grease
The quality indexes of lubricating grease used for idlers shall be in accordance with those specified in Table 1.
Table 1 Quality Indexes of Lubricating Grease
