GB/T 24503-2009 in English

《GB/T 24503-2009矿用圆环链驱动链轮》由603（中国煤炭工业协会）归口，主管部门为中国煤炭工业协会。
本标准规定了矿用圆环链驱动链轮的型式和尺寸、要求、试验方法、检验规则、标志、包装、运输和贮存。

Mining drive sprocket for chains (round link)

1 Scope

This standard specifies the type and dimension, requirements, test methods, inspection rules, marking, packaging, transportation and storage of mining drive sprocket for round-link chains (hereafter referred to as “sprocket”).

This standard is applicable to the drive sprockets with round-link chain as traction chain in scraper conveyor, scraper loader, coal plough, boring machine and coal winning machine, and also to the drive sprockets in other equipment with round-link chain as traction chain.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.

GB/T 228-2002 Metallic materials — Tensile testing at ambient temperature (eqv ISO 6892:1998)
GB/T 229-2007 Metallic materials — Charpy pendulum impact test method (ISO 148-1: 2006, MOD)
GB/T 985.2 Recommended joint preparation for submerged arc welding (GB/T 985.2-2008, ISO 9692-2:1998, MOD )
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 6060.1 Surface roughness comparison specimen — Part 1: Casting surface (GB/T 6060.1-1997, eqv ISO 2632-3:1979)
GB/T 6060.2 Roughness comparison specimens — Ground, turned, bored, milled, shaped and planed (GB/T 6060.2-2006, ISO 2632/1:1985, MOD)
GB/T 6402 Steel forgings — Method for ultrasonic testing
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10111-2008 Generation of random numbers and procedures applied to sampling inspection for product quality
GB/T 12718 High-tensile steel chains ( round link ) for mining (GB/T 12718-2009, ISO 610:1990, NEQ)
GB/T 13264 Sampling procedures and tables for small lot inspection by attributes for percent nonconforming items
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw detector using pulse echo technique
MT/T 71-1997 (confirmed in 2004) Shackle type connector units for mining round link chain
MT/T 99-1997 Flat type connector units for mining round link chain

3 Type and and dimension

3.1 The type and dimension of each sprocket shall meet the requirements of Figure 1 and Table 1.

3.2 If the sprocket size is not included in Table 1, it shall be calculated according to the formula given in Table 2. See Annex A for calculation examples and figures.

Foreword iii
1 Scope
2 Normative references
3 Type and and dimension
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
Annex A (Informative) Calculation examples
Annex B (Normative) Allowable chord length deviation of angle deviation of adjacent pockets
Annex C (Normative) Inspection method for mechanical properties of materials for sprocket
Annex D (Normative)