This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of sealed and lubricated tracks for coal mine loading machinery. This standard applies to sealed and lubricated track assemblies for coal mine loading machinery (hereinafter referred to as tracks). Other equipment in coal mines, such as sealed and lubricated tracks, should also comply with this standard. MT/T 461-1995 Sealed and lubricated track assemblies for coal mine loaders MT/T461-1995 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Subject Content and Scope of Application of Sealed Lubricated Track Assembly of Coal Mine Loading Machinery
MT/T 461-1995
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of sealed lubricated tracks of coal mine loading machinery.
This standard applies to sealed lubricated track assembly of coal mine loading machinery (hereinafter referred to as track), and other equipment in coal mines such as sealed lubricated tracks should also be implemented.
2 Reference Standards
GB2828 Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to Continuous Batch Inspection)GB9174 General Technical Conditions for Transport Packaging of General GoodsZBD92004 Side Unloading Rock Loader for Coal Mine
3 Terms
3.1 Pressing Force
The axial pressure required to press the pin shaft and pin sleeve into the link track joint hole during track assembly. 3.2 Inside opening distance
The minimum distance between the inside of the left and right track segments in the crawler. 4 Product classification
4.1 Crawler joint connection method
4.1.1 Live pin connection (common type, i.e., type A). 4.1.2 Diagonal split type (type B).
4.1.3 Trapezoidal cross-section split type (type C).
4.2 Pitch
The pitch of the lubricating belt of the coal mine loading machinery seal is: 116, 125, 137, 146, 158, 167mm. 4.3 Structure
4.3.1 The main structure of the crawler, i.e., the schematic diagram of the A-type structure, is shown in Figure 1. Approved by the Ministry of Coal Industry of the People's Republic of China on December 28, 1995 206
Implementation on May 1, 1996
MT/T 461--1995
1—track link; 2—live pin sleeve; 3—live pin; 4—seal; 5—pin sleeve; 6—pin shaft; 7—oil plug; 8—belly plate; 9—bolt 4.3.2 Tracks with a pitch of 158 and 167 mm may use type B live joints. See Figure 2 for a schematic diagram. Figure 2
4.3.3 Tracks with a pitch of 116 and 125 mm can use a type of live joint. See Figure 3 for a schematic diagram. 207
4.4 Product model
MT/T461-1995
Pitch/plate width mm
Live joint connection method number: A—live pin type,
B—diagonal split type; C—trapezoidal section split type sealed lubricated type
Marking example: Track LMA146/260 means a type A sealed lubricated track with a pitch of 146 mm and a track plate width of 260 mm. 5 Technical requirements
5.1 General technical requirements
5.1.1 Tracks should be manufactured according to product drawings and technical documents approved through prescribed procedures and should comply with the requirements of this standard. 5.1.2 All general technical requirements for casting, forging, heat treatment, machining and assembly must comply with the technical requirements indicated in the drawings and the provisions of relevant national standards.
5.1.3 The surface of cast and forged parts should be smooth and free of defects such as burrs and cracks. Before assembly, the chain track links, pin shafts, pin sleeves and other parts should be sampled for non-destructive testing.
5.1.4 The raw materials should be marked and certified by the quality inspection department of the supplier. The manufacturer should sample and identify them, and they can only be used after they are confirmed to be qualified.
5.1.5 Purchased parts and cooperative parts must have a certificate of qualification. The manufacturer should sample and inspect them, and they can only be assembled after they are confirmed to be qualified. 5.1.6 The track structure should be easy to repair, maintain and replace. 5.2 Technical requirements for track assembly
5.2.1 Bolt tightening torque See Table 1.
Bolt diameter, mm
MT/T 461-1995
Performance level
5.2.2 Bolts are tightened alternately. After factory test, mud and sand are removed and all tightened again. Tightening torque, N·m
117~156
137~186
196254
225294
5.2.3 Bolts and nuts are in uniform contact with the surface of the connected parts and shall not be tilted. Correction by hammering or other methods is not allowed. 5.2.4 There shall be no gap between the track plate and the chain track segment. 5.2.5 The pitch deviation of the track shall not exceed ±0.3mm, and the inner side opening deviation shall not exceed ±0.7mm. 5.2.6 The side clearance J of the rotating plane at both ends of each chain track segment of the track (see Figure 1), 0.5mm≤J<2mm. 5.2.7 The straightness tolerance of the crawler track is less than 3mm for every 10 sections, and less than 6mm for the total length. 5.2.8 The crawler track should be able to rotate flexibly, and there should be no interference and blocking between adjacent crawler plates and chain track sections. The forward rotation angle should not be less than 30, and the reverse rotation angle should not be less than 10°.
5.2.9 The protruding lengths of the belly belt pin and the pin sleeve at both ends should be symmetrical and uniform. The symmetry tolerance of the pin sleeve should be less than 0.5mm, and the symmetry tolerance of the pin shaft should be less than 1mm.
5.2.10 The pressing force of the chain track section, pin shaft, and pin sleeve should not be less than 1.2 times the weight of the matching host (including crawler track). 5.2.11 The crawler track should be well sealed and there should be no oil leakage. During underground operation or ground testing, mud and sand should not enter the matching gap between the pin shaft and the pin sleeve.
5.2.12 The seals should comply with the provisions of Appendix A of this standard and should be supplied by a professional manufacturer selected by the design department. 5.2.13 The crawler should be oiled sideways, and the type and amount of lubricating oil should comply with the requirements of the design and operating instructions. 5.2.14 Take a section of crawler and conduct sealing and wear resistance tests on a special bench. 5.2.15 The belly plate is painted with black anti-rust paint, and other parts are painted with anti-rust oil. 5.2.16 From the date of installation and use, the crawler's cumulative normal loading and unloading walking distance (service life) in underground rock tunnels should not be less than 300km under the conditions specified in the operating instructions. 6 Test method
6.1 Appearance and assembly quality inspection
The appearance quality is inspected by visual inspection, and the gap between the nut and the chain track segment and the gap between the track plate and the chain track segment is detected with a feeler gauge. 6.2 Tightening torque
The tightening torque of the bolts is detected with a torque wrench. 6.3 Pitch detection
Put the track on the platform and tighten it, eliminate the gap between the pin shaft and the pin sleeve, and use the outer caliper to measure the outer busbar distance between two adjacent pin sleeves. Press the track in the opposite direction and use the inner caliper to measure the inner busbar distance between two adjacent pin sleeves. Take the average of the two measurement results. 6.4 Side clearance detection
Use a feeler gauge to measure within the rotation angle range specified in Article 5.2.8. 6.5 Inner distance detection
Spread the track flat and use a caliper to measure the inner distance between the left and right link track sections. 6.6 Straightness detection
Tighten and flatten the track during measurement, and measure on the inner side of the track surface near the pin sleeve. 209
6.7 Rotation performance detection
MT/T 461--1995
After the track is spread flat, pull the assembly to measure the maximum rotation angle between two adjacent sections in the forward and reverse directions. When checking the rotating pair in the middle part, the crawler can be lifted vertically.
6.8 Detection of the protruding length of the pin shaft and the pin sleeve at both ends Use a depth gauge to detect the length of the pin shaft and the pin sleeve protruding from the interference fit of the chain track segment. 6.9 Pressing force test
On the material testing machine, press the pin shaft and the pin sleeve into and out of the chain track segment respectively, and measure the axial force of the pin shaft and the pin sleeve when they are first loosened in the interference hole of the chain track segment.
6.10 Leakage test
Put the crawler flat and wipe the oil stains on the surface of each component of the rotating pair of the chain track segment with cotton yarn. After 24 hours, insert 50mm×50mm kraft paper (120g/m2) from bottom to top into the side gap of the warm belt chain track segment, and press the pin sleeve against the inner side of the rail surface. After 10s, the width of the kraft paper wetted with lubricating oil should not exceed 3 mm.
6.11 Oil filling quantity detection
Stand the crawler on its side with the oil filling hole facing upwards, pull out the oil plug, and measure the oil level with a clean steel wire. 6.12 Sealing and wear-resistant bench test
6.12.1 Apply a simulated traction load of not less than 2500N to the crawler under test through a spring or hydraulic cylinder. 6.12.2 Observe the rotation of adjacent track segments of the crawler through the crank rocker mechanism. 6.12.3 Add a suspended abrasive mainly composed of 80-mesh quartz sand, cement and water into the test box. The abrasive surface should not be lower than the center line of the belt pin.
6.12.4 The cumulative movement of the track segment rotating pair is not less than 200,000 times. 6.13 Industrial test
When the crawler machine is used for industrial test underground, it shall be used continuously for not less than 3 months, and the cumulative walking distance in medium-hard (f6~f8) or above rock shall not be less than 300km, or the cross section of 14m2 of rock tunnel excavated under normal construction conditions shall not be less than 300m. 7 Inspection rules
Crawler inspection is divided into factory inspection and type inspection. Factory inspection is carried out by the inspection department of the manufacturer, and type test is carried out by the product quality supervision and inspection agency or the unit designated by the competent department. 7.1 Factory inspection
Crawlers must be inspected and qualified by the inspection department of the manufacturer before they can leave the factory, and documents proving the quality of the product must be attached when leaving the factory. 7.1.1 The inspection items, classification and acceptable quality level (AQL) shall be in accordance with the provisions of Table 2. The inspection items shall be in accordance with the provisions of Table 3. Table 2
Sealing
Tightening torque
Inner side opening
Items listed in Table 3
7.1.2 During continuous batch production, the sampling inspection shall be carried out in accordance with GB2828, using a single sampling plan, and the general inspection level is I. The sample size code shall be determined by the manufacturer according to the production batch or by negotiation between the supply and demand parties. During the inspection, if the number of defects in each item is equal to or less than the corresponding qualified judgment number (AC), the batch of products shall be accepted, otherwise it shall be rejected. 7.1.3 When the production is not continuous (less than 100 tracks per year), the tracks shall be inspected one by one, and the number of track links of each track shall not be less than 210
MT/T 461---1995
20%. The inspection items are shown in Table 3. If any of the inspection items is unqualified, the product shall be unqualified. 7.2 Type test
When one of the following situations occurs, a type test shall be carried out. Trial determination and identification of new products or old products for transfer to factory production; after formal production, if there are major changes in structure, materials, processes, etc., which may affect product performance, after normal production accumulates 400 tracks, a periodic inspection shall be carried out. If the number does not reach 400 within three years, a type inspection must also be carried out; when the product is stopped for more than three years and then resumed; when the factory inspection results are significantly different from the last type test; when the national quality supervision agency makes a request. Type inspection samples are randomly selected from qualified tracks and parts stored in the production plant. Once the sampling is confirmed, it should be sealed and shall not be adjusted, repaired or replaced at will.
Type inspection shall be carried out according to the contents listed in Table 3. If one item is unqualified, double sampling shall be conducted for re-inspection. If there are still unqualified items in the re-inspection, the type inspection shall be deemed unqualified. The number of track type inspections is one. Table 3
Inspection items
Appearance quality
Assembly quality
Tightening torque
Side clearance J
Inner side opening
Straightness
Rotation performance
Symmetry of pin shaft
Symmetry of pin sleeve
Pressing force
Sealing
Oil filling quantity
Bench test
Industrial test
Marking, packaging, transportation and storage
The crawler can be shipped naked or in boxes.
Technical requirements
5.23,5.24
Inspection method
Inspection category
New products
When the crawler shoe and crawler are shipped separately, the entire chain link can be coiled and bundled or packed in lattice boxes. Bolts, nuts, pins, pin washers, seals, etc. 211
MT/T 461—1995
Pack in boxes. After cleaning, pack the parts. There should be waterproof paper inside the box. The box must be firm and reliable. 8.3 Bare packaging and box packaging should comply with the provisions of GB9174. The packaging type and protection method of the box shall be determined by the supply and demand parties according to the storage and transportation conditions.
8.4 The pin shaft hole and the pin sleeve hole of the joint shall be coated with anti-rust oil. The tooth surface of the joint is split, and the threaded hole is coated with anti-rust oil and wrapped with waterproof paper. It is strictly forbidden to bump. 8.5 When the crawler is shipped with the machine, the main machine quality certificate shall indicate the crawler model. When the crawler is shipped as an accessory, there shall be a packing list and quality certificate in the packaging box. The certificate shall include the following contents: a.
Manufacturer name and address;
Product name and specifications;
Manufacturing date (or number);
Inspector's signature.
8.6The shipping mark on the packaging box shall indicate the following contents: a.
Product name, specifications, quantity;
Batch number or box number (or contract number);
Box size (length × width × height);
Net weight and gross weight;
Packing date;
Arrival station (port) and receiving unit;
Departure station (port) and shipping unit.
8.7The finished crawler should be stored in the warehouse. Storage period of more than two years should be re-factory inspection, 212
MT/T 461--1995
Appendix A
Types and technical requirements of track seals
(Supplement)
Types and structures of seals and elastic rings are shown in Figure A1A1
Seal diagram
Technical requirements of seals and elastic rings are shown in Table A1A2
Hardness Shore A
Tear strength, MPa
Tear elongation, %||t t||100% tensile strength, MPa
Tear strength, kN/m
Hot air aging
Sealing ring (80℃×70h)
Elastic ring (120℃×70h）
Oil resistance test
No. 1 standard oil
Sealing ring (80C×70h)
Elastic ring (120℃×70h）
Elastic ring
Sealing ring
Polyether polyurethane
≥120
Change in hardness
Change in breaking strength, %
Change in breaking elongation, %
Compression set, %
Change in hardness Shore A
Change in breaking strength, %
Change in breaking elongation, %
Change in volume, %| |tt||-3～+3
-3～+3
Elastic ring
Nitrile synthetic rubber
≥>14
≥300
5～+5
-5～+5
Additional instructions:
MT/T461--1995
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Mine Equipment Branch of the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted by the Beijing Well Construction Research Institute of the China Coal Research Institute. The main drafters of this standard are Jiang Jinqiu, Yu Demei and Shao Hucheng. This standard is entrusted to the Beijing Well Construction Research Institute of the China Coal Research Institute for interpretation. 21424
Inspection method
Inspection category
New products
When the track plate and track are shipped separately, the whole track link can be coiled and bundled or packed in a lattice. Bolts, nuts, pins, pin washers, seals, etc. 211
MT/T 461—1995
Pack them in packaging boxes. After the parts are cleaned, they should be packed in boxes. There should be waterproof paper in the boxes, and the boxes must be firm and reliable. 8.3 Bare packaging and box packaging should comply with the provisions of GB9174. The packaging type and protection method of the packaging box shall be determined by the supply and demand parties according to the storage and transportation conditions.
8.4 The pin shaft hole and the pin sleeve hole of the joint should be coated with anti-rust oil. The tooth surface of the joint is split, and the threaded hole is coated with anti-rust oil and wrapped with waterproof paper. It is strictly forbidden to bump. 8.5 When the crawler is shipped with the machine, the main machine quality certificate shall indicate the crawler model. When the crawler is shipped as an accessory, there shall be a packing list and quality certificate in the packaging box. The certificate shall include the following contents: a.
Manufacturer name and address;
Product name and specifications;
Manufacturing date (or number);
Inspector's signature.
8.6The shipping mark on the packaging box shall indicate the following contents: a.
Product name, specifications, quantity;
Batch number or box number (or contract number);
Box size (length × width × height);
Net weight and gross weight;
Packing date;
Arrival station (port) and receiving unit;Www.bzxZ.net
Departure station (port) and shipping unit.
8.7The finished crawler should be stored in the warehouse. Storage period of more than two years should be re-factory inspection, 212
MT/T 461--1995
Appendix A
Types and technical requirements of track seals
(Supplement)
Types and structures of seals and elastic rings are shown in Figure A1A1
Seal diagram
Technical requirements of seals and elastic rings are shown in Table A1A2
Hardness Shore A
Tear strength, MPa
Tear elongation, %||t t||100% tensile strength, MPa
Tear strength, kN/m
Hot air aging
Sealing ring (80℃×70h)
Elastic ring (120℃×70h）
Oil resistance test
No. 1 standard oil
Sealing ring (80C×70h)
Elastic ring (120℃×70h）
Elastic ring
Sealing ring
Polyether polyurethane
≥120
Change in hardness
Change in breaking strength, %
Change in breaking elongation, %
Compression permanent set, %
Change in hardness Shore A
Change in breaking strength, %
Change in breaking elongation, %
Change in volume, %| |tt||-3～+3
-3～+3
Elastic ring
Nitrile synthetic rubber
≥>14
≥300
5～+5
-5～+5
Additional instructions:
MT/T461--1995
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Mine Equipment Branch of the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted by the Beijing Well Construction Research Institute of the China Coal Research Institute. The main drafters of this standard are Jiang Jinqiu, Yu Demei and Shao Hucheng. This standard is entrusted to the Beijing Well Construction Research Institute of the China Coal Research Institute for interpretation. 21424
Inspection method
Inspection category
New products
When the track plate and track are shipped separately, the whole track link can be coiled and bundled or packed in a lattice. Bolts, nuts, pins, pin washers, seals, etc. 211
MT/T 461—1995
Pack them in packaging boxes. After the parts are cleaned, they should be packed in boxes. There should be waterproof paper in the boxes, and the boxes must be firm and reliable. 8.3 Bare packaging and box packaging should comply with the provisions of GB9174. The packaging type and protection method of the packaging box shall be determined by the supply and demand parties according to the storage and transportation conditions.
8.4 The pin shaft hole and the pin sleeve hole of the joint should be coated with anti-rust oil. The tooth surface of the joint is split, and the threaded hole is coated with anti-rust oil and wrapped with waterproof paper. It is strictly forbidden to bump. 8.5 When the crawler is shipped with the machine, the main machine quality certificate shall indicate the crawler model. When the crawler is shipped as an accessory, there shall be a packing list and quality certificate in the packaging box. The certificate shall include the following contents: a.
Manufacturer name and address;
Product name and specifications;
Manufacturing date (or number);
Inspector's signature.
8.6The shipping mark on the packaging box shall indicate the following contents: a.
Product name, specifications, quantity;
Batch number or box number (or contract number);
Box size (length × width × height);
Net weight and gross weight;
Packing date;
Arrival station (port) and receiving unit;
Departure station (port) and shipping unit.
8.7The finished crawler should be stored in the warehouse. Storage period of more than two years should be re-factory inspection, 212
MT/T 461--1995
Appendix A
Types and technical requirements of track seals
(Supplement)
Types and structures of seals and elastic rings are shown in Figure A1A1
Seal diagram
Technical requirements of seals and elastic rings are shown in Table A1A2
Hardness Shore A
Tear strength, MPa
Tear elongation, %||t t||100% tensile strength, MPa
Tear strength, kN/m
Hot air aging
Sealing ring (80℃×70h)
Elastic ring (120℃×70h）
Oil resistance test
No. 1 standard oil
Sealing ring (80C×70h)
Elastic ring (120℃×70h）
Elastic ring
Sealing ring
Polyether polyurethane
≥120
Change in hardness
Change in breaking strength, %
Change in breaking elongation, %
Compression permanent set, %
Change in hardness Shore A
Change in breaking strength, %
Change in breaking elongation, %
Change in volume, %| |tt||-3～+3
-3～+3
Elastic ring
Nitrile synthetic rubber
≥>14
≥300
5～+5
-5～+5
Additional instructions:
MT/T461--1995
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Mine Equipment Branch of the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted by the Beijing Well Construction Research Institute of the China Coal Research Institute. The main drafters of this standard are Jiang Jinqiu, Yu Demei and Shao Hucheng. This standard is entrusted to the Beijing Well Construction Research Institute of the China Coal Research Institute for interpretation. 214
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.