This standard specifies the structural type and main dimensions, technical requirements, testing rules, marking, packaging, transportation and storage of combined crawler assemblies for construction machinery with track pitches of 171, 203, 216 and 228.6 mm. The A-type crawler assemblies specified in this standard are applicable to bulldozers, and the B-type crawler assemblies are applicable to loaders, push-rake machines, pipelayers, well-drilling machines and excavators. JB/T 2602-2001 Combined crawler assemblies for construction machinery JB/T2602-2001 Standard download decompression password: www.bzxz.net

ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T2602—2001
Construction machinery
Combined track assembly
Construction machineryTrack competes2001-04-03 Issued
China Machinery Industry Federation
Implementation on 2001-10-01
JB/T2602—2001
This standard is a revision of JB/T2602-1979 "Combined track assembly for construction machinery". Compared with JB/T2602-1979, the main technical content of this standard has been changed as follows: - Added chain link 40M2H, 35CrMoH materials and track plate 33MnH, 35Mn2H materials: - Deleted the size parameters and drawings of parts: - Replaced the old parameters with the structural parameters of new products: - Added the inspection rules and regulations for batch inspection and counting sampling. This standard will replace JB/T2602-1979 from the date of implementation. This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The responsible drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Shandong Bulldozer General Factory Crawler Branch, Yantai Tractor Parts Factory, and Hunan Engineering Machinery Factory.
Participating drafting units of this standard: Yantai Guangxing Group Crawler Factory, Xuanhua Huaxing Heavy Chain Factory. The main drafters of this standard are: Li Mingxiang, Cao Yongxin, Wang Jiurong, and Lu Puqing. This standard was first issued in July 1979, and this is the first revision. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
Construction machinary-Track completes
Construction machinary-Track completesJB/T2602—2001
Replaces JB/T2602-1979
This standard specifies the structural type and main dimensions, technical requirements, inspection rules, marking, packaging, transportation and storage of construction machinery combined crawler assemblies (hereinafter referred to as crawler assemblies) with crawler pitches of 171, 203, 216 and 228.6 mm. The A-type crawler assemblies specified in this standard are applicable to pushers, and the B-type crawler assemblies are applicable to loaders, pushers, pipelayers, well-draining machines and excavators.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T28281987
JB/T2984.3—1999
JB/T5932.5—1991
3 Structural type and main dimensions
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches) Nuts for crawler tracks and gear blocks of crawler bulldozers Crawler track bolts
The crawler assembly consists of two types: Type A and Type B. The structural type and main dimensions of Type A crawler assembly are shown in Figure 1 and Table 1, and the structural type and main dimensions of Type B crawler assembly are shown in Figure 2 and Table 1. The parts list of Type A and Type B is shown in Table 2. The markings of the track assembly are as follows: x口x口
Standard number of track assembly
Number of track plates
Track shoe width
Nominal track pitch
Track type
Marking example
Nominal track pitch is 216mm, track shoe width is 560mm, and type A track assembly with 38 sections is marked: Track A216X560×38JB/T2602—2001Approved by China Machinery Industry Federation on April 3, 2001Implementation on October 1, 2001
JB/T2602—20 01
Figure 1A type track assembly
Pitch t
Main parameters of track assembly
Pitch t
JB/T2602-2001
Table 1 (end)bzxZ.net
Note: Dimensions in brackets should not be used as much as possible:
Track shoe width B is selected according to ground contact pressure
Figure 2B type track assembly
Parts name
A type track shoe
B type track shoe
Track pin
Track pin bushing
Track locking pin
Track pin Washer
Track locking pin sleeve
Track nut
Track bolt
Track right link
Track left link
Note: The material with H is hardenable steel, technical requirements
JB/T2602—2001
2Parts details
Recommended materials
40SiMh2, 33MnH, 35Mn2H
40SiMh2, 33MnH, 35Mn2H
50Mh, 40Mn2H
20Mh, 2 0CrMb
50Mh40Mn2H
40Cr、35CrMo
40Mh2、40Mr2H、35CIMoH
40Mh2、40Mr2H、35CMoH
Standard code
JB/T2602
JB/T2984.3
JB/T5932.5
JB/T2602
The track assembly shall be manufactured according to the drawings and technical documents approved by the prescribed procedures and shall comply with the requirements of this standard. The material properties of all parts of the track assembly shall comply with the provisions of the relevant standards. The standard parts and matching parts of the track assembly shall comply with the relevant standards. The track assembly shall be painted evenly and flat: the appearance shall be smooth and beautiful, and no cracks are allowed. The assembly extension at both ends of the pin should be within ±1.5mm. The side clearance of the rotating plane between the two chain links should be within 1.5 ±1mm. The straightness of the chain links after assembly is 4mm for every 10 links and 8mm for the total length. The tightening torque of the bolts should be selected according to the requirements of the drawings. The positive bending angle of the track assembly is not less than 28, and the reverse bending is not less than 7°. The track assembly should rotate flexibly, without jamming and interference. The service life of the track assembly is not less than 3000h under earthwork conditions and not less than 800h under stonework conditions. 5 Inspection rules
Factory inspection
Each track assembly shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped. The factory inspection items include the appearance of the assembly, the integrity of the assembly, the rotation performance, the straightness of the total length, the tightening torque of the bolts, etc. 5.2 Type test
5.2.1 Classification of nonconformities
Any inspected item that does not meet the requirements of Chapter 4 is called a nonconformity. Nonconformities are divided into Class A, Class B and Class C nonconformities, see Table 3.
Sampling plan
JB/T2602-2001
5.2.2.1 Sampling inspection According to the provisions of GB/T2828, the sampling plan type is selected as a normal sampling plan. 5.2.2.2 Inspection level is selected as the general inspection level Class II 3 inspection batch N is generally 16-25 items, but when the user is sampling, the size of N is not limited. Random sampling. 5.2.2.3
5.2.2.4 The sample size code is C, and the randomly selected sample size n-5 (pieces) should be inspected according to the items listed in Table 3, and at least one chain link, one pin sleeve, one pin shaft and one track plate should be partially cut to measure the hardened layer depth and metallographic structure. The section test results of this piece represent the results of all samples.
5 The AOL value of the track assembly quality level is shown in Table 4. 5.2.2.6 Sampling plan, see Table 4. The AQL value in the table is the acceptable quality level per hundred units of products, where Ac represents the number of qualified judgments per hundred units of products, and Re represents the number of unqualified judgments per hundred units of products. The number of items can be used as the minimum judgment unit during inspection. 5.2.3 Evaluation of Sampling Inspection
Inspect the samples according to the sampling plan specified in this standard and fill in the results in the summary table (see Table 5). When the number of unqualified items per hundred items in the sample is less than or equal to Ac, it is judged as qualified; when it is greater than or equal to Re, it is judged as unqualified. When all categories are judged as qualified, the product is finally evaluated as qualified, otherwise it is unqualified. However, it is allowed to replace the missing Class B unqualified items with the excess Class C unqualified items. Table 3 Classification of non-conforming items
Non-conforming category
Category A (fatal)
(serious)
(general)
Non-conforming item content
Assembly has not been used Track chain links have visible cracks or cannot be bundled Track plate rib or plate hardness does not meet the requirements Track pin sleeve surface hardness or hardened layer depth does not meet the requirements Track pin surface hardness does not meet the requirements
Track chain link track surface hardness or hard layer depth does not meet the requirements Track assembly is not flexible enough
Track assembly installation straightness does not meet the requirements
Track assembly The forward or reverse bending angle does not meet the requirements. The tightening torque of the bolt does not meet the requirements.
The inner and outer diameter dimensional accuracy or surface roughness of the track pin sleeve does not meet the requirements. The outer diameter dimensional accuracy or surface roughness of the track pin shaft does not meet the requirements. The mechanical properties of the bolts do not meet the requirements.
The material properties of the main parts of the assembly (chain links, plates, sleeves, pin shafts, bolts) do not meet the requirements. The dimensional accuracy of the track link pin sleeve hole or the pin shaft hole does not meet the requirements. The surface roughness of the track link pin sleeve or the pin shaft hole does not meet the requirements. The hardness of the track link core does not meet the requirements.
The dimensional accuracy or position tolerance of the track plate installation hole does not meet the requirements. The hardness of the track plate core. Not up to the requirements
The accuracy of the rotating surface clearance between the two chain links does not meet the requirementsThe depth of the hard layer of the pin does not meet the requirements
The dimensional accuracy of bolts and nuts does not meet the requirements
The surface roughness of bolts and nuts does not meet the requirementsThe protrusion at both ends of the pin does not meet the requirements
The anti-rust performance of bolts and nuts does not meet the requirements
Uneven painting
Standard parts and accessories do not meet the standard requirementsThe appearance quality of the assembly does not meet the requirements
Unqualified classification
Class A unqualified
Sampling plan
Bulking Technology Research and Development
6 signs, Packaging, transportation and storage
6.1 Marking
JB/T2602—2001
Table 4 Sampling plan
Inspection result summary
Class B nonconformity
AQL=65
Sampling plan
The track assembly shall at least include the following textual contents when it leaves the factory: a) Manufacturer name;
b) Track assembly specifications and quantity;
c) Track assembly standard name and code:
d) Manufacturing date or delivery date;
e) Inspection certificate.
6.2 Packaging and transportation
Class C nonconformity
AQL=150
Sampling plan
6.2.1 The packing of the track assembly can be carried out according to the user's requirements. Use a baler to roll the crawler assembly into a disc shape, and use strong iron wire to tie and tighten the crawler chain link head to prevent loosening or damage during transportation. The crawler plate can also be packed separately. 6.2.2 The crawler assembly can be transported in containers or naked, but it should be tied firmly to prevent damage. 6.2.3 The following should be indicated when shipping:
a) Name, address, and zip code of the receiving unit; b) Assembly name, specifications, quantity, and weight; c) Shipping date;
d) Manufacturer name, address, zip code, and telephone number. 6.3 Storage
The crawler assembly should be placed in a ventilated, dry, and corrosion-free warehouse, and it should be guaranteed not to rust within 1 year. 6
Mechanical Industry Standard
Engineering Machinery Combined Track Assembly
JB/T2602—2001
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing: Postal Code 100044)*
Format 880X12301/16 Printing Sheet 3/4
4 Word Count 14.000
First Edition in August 2001
First Printing in August 2001
Price 1200 Yuan
Printing Quantity 1-500
2001-015
Mechanical Industry Standard Service Network: http/AvwwJB.ac.cn1002092 /
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