HG/T 2329-1992 Rubber bushing for flexible universal joint of tractor HG/T2329-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Tractor Flexible Universal Joint Rubber Bushing
Subject Content and Scope of Application
HG2329-92
This standard specifies the type, size, physical properties, test methods, inspection rules and marking, packaging, transportation and storage of tractor flexible universal joint rubber bushings (hereinafter referred to as bushings). This standard applies to the flexible universal joint rubber bushings of the Dongfanghong-802 crawler tractor and its variant mechanical coupling active and passive discs. The same type of flexible direction joint rubber bushings used on other tractors can also be used for reference. 2 Reference standards
GB528 Test method for tensile properties of vulcanized rubberGB531 Test method for Shore A hardness of rubberGB1682
GB 2828
Test method for brittle temperature of vulcanized rubber
Batch inspection counting sampling procedure and sampling table (applicable to continuous inspection)GB 2909.1
GB3081
GB 3512
GB 3672
GB 5721
GB5722
GB6031
GB6032
GB-7759
3 Classification
Technical requirements for cotton canvas for rubber industry
General purpose hot-dip galvanized low-carbon steel wire
Test method for hot air aging of rubber
Dimensional tolerance of rubber products
General provisions for marking, packaging and transportation of rubber sealing products General provisions for storage of rubber sealing productswww.bzxz.net
Vulcanized rubber Determination of international hardness (30~~85IRHD) Determination of international hardness of vulcanized rubber (30～85IRHD) Conventional test method
Micro test method
Determination of constant deformation and compression set of vulcanized rubber at room temperature and high temperature 3.1 Type and size
Flexible universal joint rubber bushing as shown in Figure 1: Approved by the Ministry of Chemical Industry of the People's Republic of China on 1992-06-01 270
Implementation on 1993-07-01
3.2 Marking
HG 2329-92
Use Chinese phonetic alphabet prefixes and numbers, and mark according to "product code, specification, standard number". Example:
4 Technical requirements
4.1 Dimension tolerance
dXDXhXH
HG2329
Standard number
-Inner wall height of product
Outer wall height of product
Outer diameter of product
-Inner diameter of product
Tractor flexible universal joint rubber bushing
The dimensions and tolerances of the bushing shall comply with the provisions of Table 1. Table 1
4.2 Physical properties
The physical properties of the vulcanized rubber used for the bushing shall comply with the provisions of Table 2. No.
Basic dimensions and tolerances
50-9:8
D and D runout tolerance 0.8
Hardness (Shore A or international hardness), degrees
Tensile strength, MPa
Elongation at break, %
Compression set (70℃×22h), %
HG2329—92
Hardness change (Shore A or international hardness), degrees Hot air aging 70℃×70h
Low temperature brittleness, -50℃
4.3 Appearance quality of the bushing
Tensile strength change rate decreases, %
Elongation at break decreases, %
The appearance quality of the bushing shall conform to the provisions of Table 3. No.
Defect Name
Cloth Wrinkles
Cloth Defects
Exposed Metal Wires on Inner Surface
Exposed Metal Wires at Ends
Overflow Marks
Bright Scars at Ends
Longitudinal Cloth Wrinkles are Permitted, with a depth of no more than 0.5mm and a number of no more than 3. Horizontal Cloth Wrinkles are Not Permitted
The total length of the insufficient cloth at both ends shall not be greater than 10mm, but it is allowed to appear at both ends simultaneously. It is allowed, but not The height of the protrusion shall not exceed 20% of the total area of ​​the inner surface. The metal wire protrusion is allowed, but the height shall not exceed 0.5mm. The height or depth of the overflow mark after trimming shall not exceed 0.5mm. The depth or degree of the model mark on both ends shall not exceed 1mm, and there shall be no more than 3 places on each side. The length of the mark shall not exceed 3mm and the width shall not exceed 2mm.
4.4 The technical specifications of the cotton canvas used for the bushing shall comply with the provisions of No. 214 in GB2909.1 standard. 4.5 The technical indicators of the galvanized iron wire metal mesh used for the bushing shall comply with YB554, with a specification of 9 mesh/inch and a steel wire diameter of 0.5±0.03mm. The appearance quality shall ensure uniform color, neat edges, uniform mesh holes, and no rust or broken wire. 5 Test method
The appearance of the bushing is measured by visual inspection or a measuring tool with a graduation value of 0.05mm. 5.1
The size of the bushing shall be measured with a measuring tool with a graduation value of 0.05mm. 5.2
5.3 The hardness test of the bushing or rubber shall be carried out in accordance with GB531 or GB6031, GB6032. GB6031 and GB6032 are arbitration methods. 5.4 The tensile strength and elongation at break of the bushing or rubber shall be measured in accordance with GB528. 5.5 The compression permanent deformation of the bushing or rubber shall be measured in accordance with GB7759. 5.6 The brittle temperature of the bushing or rubber shall be measured in accordance with GB1682. The hot air aging test of the bushing or rubber shall be carried out in accordance with GB3512. 5.7
Inspection rules
Factory inspection
HG 2329-92
6.1.1 The appearance quality of the bushing shall be checked piece by piece in accordance with the provisions of Table 3. 6.1.2 The dimensions and tolerances of the bushings shall be in accordance with the provisions of Table 1, and random inspection shall be carried out using GB2828, with the general inspection level being I and the acceptable quality level (AQL) being 4.0.
6.1.3 Physical property inspection of bushing rubber layer or corresponding rubber compound: 6.1.3.1 The inspection items are hardness, tensile strength, elongation at break, and compression permanent deformation. 6.1.3.2 The same rubber compound produced by the same machine is a batch, and each batch does not exceed 500kg. Bushings are not more than 3,000 pieces per batch, and each batch is inspected once.
6.2 Type inspection
All technical requirements specified in the standard shall be inspected. Among them, the hot air aging test (determination of hardness, tensile strength, elongation at break) and brittle temperature shall be inspected at least once every quarter. 6.3 Judgment rules
6.3.1 If one of the physical properties of the bushing is unqualified, double samples are allowed to be taken for re-testing. If it is still unqualified after re-testing, the batch of products is unqualified.
If one of the physical properties of the rubber material is unqualified, it is allowed to be repaired once. After the repair, all performance tests must be carried out. If one of the physical properties is still unqualified, the batch of rubber material is unqualified and the products made of this rubber material are unqualified. The physical property test results of the product (bushing) shall be the arbitration result. 6.3.2 If the appearance is unqualified, it is allowed to be repaired once. If it is still unqualified after repair, it is unqualified. 7 Marking, packaging, transportation, storage
7.1 Marking, packaging, and transportation shall be carried out in accordance with the relevant provisions of GB5721, and each box shall not exceed 200 pieces. 7.2 Storage shall be carried out in accordance with GB5722.
Additional instructions:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Rubber Parts Branch of Luoyang Tire Factory. The main drafters of this standard are Wu Ke, Wang Wenfu and Liang Aizhen. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG4-558--67 "Tractor Flexible Universal Joint Rubber Bushing (Trial)" will be invalid.
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