This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage rules for variable speed V-belts for agricultural machinery. This standard is mainly applicable to variable speed transmission V-belts for agricultural machinery. GB/T 14829-1993 Variable speed (half-width) V-belts for agricultural machinery GB/T14829-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Variable-speed (half wide) V-belts for agricultural machinery
1 Subject content and scope of application
GB/T14829-93
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage rules of variable-speed V-belts (hereinafter referred to as "belts") for agricultural machinery (especially harvesting and threshing machinery). This standard is mainly applicable to variable-speed transmission V-belts for agricultural machinery. 2 Reference standards
GB/T3686 Test method for full-section tensile properties of V-belts GB/T3687 Determination method for interlayer bonding strength of V-belts GB/T3688 Test method for bonding strength between V-belt cords and rubber GB/T10821 Dimensions of V-belts for agricultural machinery
GB/T12735 Fatigue test method for V-belts for agricultural machinery 3 Product classification
3.1 Structural type
The structure of the belt is shown in Figure 1, which consists of a wrapping cloth, a top rubber, a tensile body, a bottom rubber and other components. According to the structure of the tensile body, it is divided into two types: a rope core belt (a) and a cord core belt (b).
Tensile body
(in)
3.2 Specification series
V-belt structure diagrambZxz.net
The belt model (cut-off size) and reference length series are in accordance with GB10821. 3.3 Marking
Marking example:
Approved by the State Administration of Sport Technical Supervision on December 30, 1993 270
Implemented on October 1, 1994
4 Technical requirements
GB/T14829-93
3750-GB ××××
一Standard number
-Reference length (mm)
The reference length and exposed height of the belt shall be in accordance with the provisions of GB/T10821. 4.2 The physical and mechanical properties of the belt shall be in accordance with the provisions of Table 1. Table 1
Tensile strength, kN
Reference force elongation, %
Adhesion strength between cord and rubber, kN /m
Adhesion strength between cord layers, kN/m
4.3HM type belts must also be tested for fatigue life and outer circumference change rate. The fatigue life and outer circumference change rate shall be in accordance with the provisions of Table 2 and expressed as the arithmetic mean of the test results of 4 specimens. Table 2
Fatigue life, h
Outer circumference change rate, %
Note, the reference length of the test belt is 3 000~4000mm range. 4.4 The appearance quality of the belt shall be in accordance with the provisions of Table 3.
The corner wrapping cloth is damaged
Defect name
5 Test method
The wrapping cloth overlaps and separates
Belt body pressure deviation
Working surface cloth longitudinal overlap
5.1 The size measurement of the belt shall be carried out in accordance with GB/T10821. 50
The cumulative length of each side of the outer wrapping cloth shall not exceed 20% of the belt length, and the inner wrapping cloth is not allowed to have
5.2 The full-section tensile strength and reference force elongation of the belt shall be carried out in accordance with GB/T3686, and the reference force shall be in accordance with Table 4. 271
Reference force
GB/T14829—93
5.3 The inter-ply bond strength of the belt shall be determined in accordance with GB/T3687; the average peeling force can be determined by either method A or method B, but method A must be used when conducting arbitration tests on products. 5.4 The cord and rubber bond strength test of the belt shall be conducted in accordance with GB/T3688. 5.5 The fatigue test and outer circumference change rate of the belt shall be conducted in accordance with GB/T12735. 6 Inspection rules
6.1 The belt shall be inspected and accepted by the quality supervision department of the manufacturer. 6.2 The size and appearance quality of each belt shall be inspected. 6.3 Belts of the same cross-section and the same material shall be produced in batches of no more than 2,000 pieces. If the quarterly output is less than 2,000 pieces, the quarterly output shall be one batch. In each batch of products, a specified number of specimens shall be taken for physical machine performance inspection. 6.4 For HM type belts of the same material, fatigue life and outer circumference change rate tests shall be conducted. For monthly production of more than 5,000 belts, samples shall be drawn once every quarter, for 2,000 to 5,000 belts, samples shall be drawn once every six months, and for less than 2,000 belts, samples shall be drawn once a year. 6.5 If one of the physical and mechanical properties and fatigue life tests does not meet the corresponding level, double samples shall be taken from the batch of products for retesting of the item. If one of the two retest results still does not meet the corresponding level, the batch of products shall be downgraded or unqualified. 7 Marking, packaging, transportation, storage
7.1 Each belt shall have obvious marks that cannot be washed off, including the following: manufacturer name or trademark;
b. Mark or model and reference length
c. Year and month of manufacture.
7.2 The belts shall be bundled and packaged according to model and specification.
7.3 During transportation and storage, the belt should be kept away from direct sunlight or rain and snow, kept clean, and prevented from contact with substances that affect the quality of the belt, such as acids, alkalis, oils and organic solvents, to prevent mechanical damage and be kept 1m away from the heating device. 7.4 During storage, the warehouse temperature should be maintained between -18 and 40℃, and the relative humidity should be maintained between 50% and 80%. During storage, the belt should be prevented from being deformed by excessive weight. It is best to hang the belt on a crescent-shaped rack or place it flat on the shelf. 7.5 In compliance with Articles 7.3 and 7.4 of this standard, the manufacturer guarantees that the physical and mechanical properties and fatigue life of the product will still meet the requirements of this standard within a storage period of no more than one year from the date of manufacture. Additional remarks:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by Tianjin Rubber Machine Belt Factory. The main drafter of this standard is Jie Deli.
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