This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of cantilevered roadheader sleeve scraper chains (hereinafter referred to as sleeve scraper chains). This standard applies to cantilevered roadheaders, as well as sleeve scraper chains for coal mining machinery such as coal loaders and continuous coal miners. MT/T 578-1996 Cantilevered roadheader sleeve scraper chains MT/T578-1996 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Sleeve Scraper Chain for Cantilever Roadheaders
MT/T578-1996
Published on August 14, 1996, and implemented on February 1, 1997. Published by the Ministry of Coal Industry of the People's Republic of China 1. Subject Content and Scope of Application
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of sleeve scraper chains for cantilever roadheaders (hereinafter referred to as sleeve scraper chains). This standard applies to cantilever roadheaders and also to sleeve scraper chains for coal mining machinery such as coal loaders and continuous coal miners. 2. Reference StandardsbZxz.net
GB3077 Technical Conditions for Alloy Structural Steel
GB238 General Technical Conditions for Cantilever Roadheaders 3. Product classification
Structural type of sleeve scraper chain
Sleeve scraper chain can be divided into integral chain link sleeve scraper chain and combined chain link sleeve scraper chain according to the structural type. 3.1.1 Integral chain link sleeve scraper chain
Integral chain link sleeve scraper chain is composed of scraper section and chain link (see Figure 1). Figure 1 Integral chain link sleeve scraper chain
1-scraper section; 2-chain link
3.1.1.1 Scraper section
The scraper section is composed of scraper, inner joint, outer joint, rivet, stud bolt, nut and lock pin and other parts (see Figure 2).
3.1.1.2 Chain link
Figure 2 Scraper link
1-Internal joint; 2-Scraper; 3-Stud bolt; 4-Nut; 5-Lock pin; 6-Rivet; 7-External joint
The chain link is composed of chain link, chain plate, pin shaft and lock pin (see Figure 3). d
Figure 3 Chain link
1-Chain plate; 2-Pin shaft; 3-Lock pin; 4-Chain link 3.1.2 Combined chain link type sleeve scraper chain
The combined chain link type sleeve scraper chain is connected by a scraper link and a chain link (see Figure 4). Among them, the scraper link is the same as the scraper link of the integral 3.2
chain link type sleeve scraper chain. Figure 4 Combined link type sleeve scraper chain
1-scraper section; 2-chain link
The chain link consists of curved link plate, straight link plate, sleeve, roller, pin and lock pin (see Figure 5). Figure 5D Chain link
1-pin; 2-lock pin; 3-curved link plate; 4-roller; 5-sleeve; 6-straight link plate Dimension series of sleeve scraper chain
Dimension series of sleeve scraper chain shall comply with the provisions of Table 1. Pitch, P
Roller outer diameter dl
Pin outer diameter d2
Conveyor groove width B
Scraper width
4. Technical requirements
420520
Sleeve scraper chain shall comply with the requirements of this standard and be manufactured in accordance with drawings and technical documents approved by the prescribed procedures. The tensile test of the sleeve scraper chain and the inspection of the length accuracy of the sleeve scraper chain shall comply with the provisions of this standard. Under the condition of ensuring the bending resistance of the scraper section and the tensile resistance of the scraper chain, the grade, chemical composition and mechanical properties of the selected steel shall comply with the provisions of GB3077. The casting scraper shall not have cracks, pores, shrinkage holes, slag inclusions and other casting defects that affect the strength of the scraper. Forgings such as forgings such as scrapers, inner and outer joints, and chain links shall not have forging defects such as overburning, interlayer, folding, cracks, scarring, slag inclusions, etc.
The scraper sections and chain links of the sleeve scraper chain should rotate flexibly. 5. Performance test methods and requirements
Tensile test
5.1.1 The loading range of the tensile testing machine shall meet the loading range requirements required for the tensile test of the scraper chain, and its accuracy shall meet the first-level standard.
5.1.2 The effective tensile section of the test sample shall have at least 2 chain links and 1 scraper section. The connection between the two ends of the chain segment and the chuck of the testing machine should ensure that no additional stress is generated on the sleeve scraper chain parts. If the chain link connected by the chuck is damaged during the test, the test is invalid. The sleeve scraper chain after the test cannot be used again. 5.1.3 The chain segments should be connected and the tensile load should be applied slowly until the minimum ultimate tensile load value specified in this standard. At this time, the chain segment shall not break. The minimum ultimate tensile load shall comply with the provisions of Table 2. Table 2
Pitch, mm
Minimum ultimate tensile load, kN
Chain length accuracy inspection
5.2.1 The sleeve scraper chain should be cleaned before measurement. 44.45
5.2.2 The sleeve scraper chain to be measured should be placed horizontally and supported in the measuring chain segment. 63.50
5.2.3 After applying the measuring load, measure the distance between the generatrix on the same side of the roller. The number of measuring links, measuring load and chain length tolerance shall comply with the provisions of Table 3.
Pitch, mm
Number of measured chain links
Measured load, N
Tolerance of chain length, mm
6. Inspection rules
Bushing scraper chain products shall be inspected by the inspection department of the manufacturer. The inspection can be carried out according to the construction drawings and the inspection requirements of this standard. They can be shipped only after passing the inspection.
The inspection of bushing scraper chain includes the size, form and position tolerance, surface quality, chain tensile test and chain length accuracy inspection of bushing scraper chain parts.
6.2.1 The size and form and position tolerance of each part of the bushing scraper chain shall comply with the requirements of the construction drawings. 6.2.2 The surface quality shall comply with the relevant provisions of the construction drawings and the technical requirements of this standard. 6.2.3 The minimum ultimate tensile load of the bushing scraper chain shall comply with the provisions of this standard. 6.2.4 The chain length accuracy of the bushing scraper chain shall comply with the provisions of this standard. 6.3
Tensile test and chain length precision test samples for each roadheader 2 pieces, if one piece of one item is unqualified, double sampling inspection shall be required. In the double sampling inspection, if one piece of one item is unqualified, the batch of products shall be judged as unqualified. 7. Marking, packaging, transportation, storage
The manufacturer shall print or forge or cast the factory logo on the obvious part of the sleeve scraper chain. When the sleeve scraper chain is shipped as a separate product, it shall be firmly tied or boxed, and shall not be scattered during transportation, and shall be accompanied by a product quality certificate. The content of the certificate shall include specifications, quantity, inspection mark and this standard number. Anti-rust measures shall be taken during transportation and storage of the product. When the scraper chain is shipped with the whole machine, it shall be implemented in accordance with the relevant provisions of MT238. Additional remarks:
This standard is proposed by the Standardization Technical Committee for Coal Special Equipment of the Ministry of Coal Industry. This standard is under the jurisdiction of the Excavation Machinery Branch of the Coal Special Equipment Standardization Committee. This standard was drafted by the Taiyuan Branch of the China Coal Research Institute. The main drafters of this standard are Liu Jianping and Ren Baorui. This standard is entrusted to the Taiyuan Branch of the China Coal Research Institute for interpretation.
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