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GB/T 20786-2015: Rubber track Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20786: Historical versions
Similar standardsGB/T 20786-2015: Rubber track---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20786-2015GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.140.99 G 47 Replacing GB/T 20786-2006 Rubber track Issued on. OCTOBER 09, 2015 Implemented on. MAY 01, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Product structure... 7 5 Classification and marking... 8 6 Requirements... 9 7 Test methods... 11 8 Inspection rules... 13 9 Marking, packaging, transportation, storage and use... 15 Appendix A (Normative) Measurement methods of rubber track overall dimensions 16ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 20786-2006, Rubber track. Compared with GB/T 20786- 2006, the major changes of this Standard are as follows. -- Modify the schematic diagram of the cross-section structure of rubber track (see Chapter 4; Chapter 4 of the 2006 edition); -- Modify the classification of rubber tracks (see 5.1; 5.1 of the 2006 edition); -- Refine the marking method for rubber tracks, and add the description of the marking method for track types (see Chapter 5; Chapter 5 of the 2006 edition); -- Modify the physical and mechanical properties of rubber materials for rubber tracks (see 6.1; 6.1 of the 2006 edition); -- Modify the core metal bending strength to core metal bending resistance (see 6.2.2; 6.2.2 of the 2006 edition); -- Modify the bonding strength index between wire cord (fiber cord) and rubber (see 6.3; 6.3 of the 2006 edition); -- Modify the longitudinal tension of the track to the longitudinal design tension of the track (see 6.4; 6.4 of the 2006 edition); -- Modify the appearance quality requirements of rubber tracks (see 6.5; 6.5 of the 2006 edition); -- Modify the dimensional tolerances of rubber tracks (see 6.6; 6.6 of the 2006 edition); -- Modify the sample preparation and adjustment (see 7.1; 8.1.2 of the 2006 edition); -- Modify the test method of the bending resistance of core metal (see 7.3.2.1; 7.9.1 of the 2006 edition); -- Modify batching and sampling (see 8.1; 8.1.1 of the 2006 edition); -- Refine the judgment rules (see 8.3; 8.3 of the 2006 edition). This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of Sub-committee of Miscellaneous, Committee of National Standardization for Rubber and Rubber Products (SAC/TC 35/SC 7). Drafting organizations of this Standard. Zhongce Rubber Group Co., Ltd., Zhenjiang Tonly Rubber Co., Ltd., Shanghai Huaxiang Rubber Track Co., Ltd., Jiaxing Taite Rubber Co., Ltd., Zhejiang Yachoo Rubber Track Co., Ltd., Zhejiang Yunzhou Technology Co., Ltd., Zhejiang Fomay Industrial Machinery Co., Ltd. Main drafters of this Standard. Zhou Guojun, Jiang Jianguo, Lu Jingbai, Lin Chunming, Wang Wenjie, Zhu Zhiyong, Wang Yiyu. The previous version replaced by this Standard is. -- GB/T 20786-2006. Rubber track1 ScopeThis Standard specifies the terms and definitions, product structure, classification and identification, requirements, test methods, inspection rules, marking, packaging, transportation, storage and use of rubber tracks. This Standard applies to rubber tracks which are made of a composite of rubber and metal or fiber materials and are mainly used for the walking parts of agricultural machinery, engineering machinery and transport vehicles.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 528, Rubber, vulcanized or thermoplastic - Determination of tensile stress- strain properties GB/T 529, Rubber vulcanized or thermoplastic - Determination of tear strength (Trouser, angle and crescent test pieces) GB/T 531.1, Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1.Duromerer method (Shore hardness) GB/T 1689, Rubber vulcanized. Determination of abrasion resistance (Akron machine)3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 rubber track An annular rubber belt composed of rubber and metal or fiber material, which is mainly applied to the walking parts of agricultural machinery, engineering machinery and transport vehicles. 3.2 lug The geometry of the ground contact side of a rubber track. 3.3 outer rubber The outer side of the rubber track, the part that contacts the ground when traveling. 3.4 inner rubber The inner side of the rubber track, the part opposite to the running wheel when traveling. 3.5 core metal The part of the rubber track that transmits power, guides and provides lateral support. 3.6 strength layer The skeleton layer in the rubber track that bears tension and transmits power, which is usually made of materials such as wire cord (fiber rope).4 Product structureThe schematic diagram of cross-section structure of the rubber track is shown in Figure 1.5 Classification and marking5.1 Classification Rubber tracks are classified into the following three types according to the drive mode. 5.2 Marking 5.2.1 Marking method The marking of rubber tracks consists of rubber track type, width (mm), pitch (mm), track type, number of rubber track sections (variable), and applicable maximum machine weight (t). See Figure 2 for the marking method. 5.2.2 Examples of marking6 Requirements6.1 Rubber materials The physical and mechanical properties of rubber materials for rubber tracks and the corresponding test methods shall comply with the requirements of Table 1. Applicable maximum machine weight (t) 6.2 Core metal 6.2.1 Bonding strength between core metal and rubber The bonding strength between core metal and rubber shall not be less than 12 kN/m. 6.2.2 Bending resistance of core metal When the core metal is subjected to bending force, the maximum bending resistance required to maintain elastic deformation shall be no less than 0.5 times the weight of the machine. 6.4 Longitudinal design tension of rubber track The longitudinal design tension of rubber track shall be greater than 5 times the weight of the machine. 6.5 Appearance quality The appearance quality of rubber track shall comply with the requirements of Table 3.7 Test methods7.1 Sample preparation and adjustment The test track shall be placed at room temperature for 48 hours before testing, including. size and surface hardness measurement, product dissection, sample preparation, etc. 7.2 Physical and mechanical properties of rubber materials 7.3 Core metal 7.3.1 Bonding strength between core metal and rubber The determination of the bonding strength between core metal and rubber shall be carried out in accordance with the provisions of GB/T 7760, and the test samples shall be prepared from semi-finished products. 7.3.2 Bending resistance of core metal 7.5 Longitudinal tension The breaking force of a single steel wire shall be determined in accordance with the provisions of GB/T 8358. The breaking force of a single fiber rope shall be determined in accordance with the provisions of HG/T 2821.1. 7.6 Appearance quality The appearance quality is checked visually, with a vernier caliper and a steel ruler. 7.7 Dimensions The measurement of the overall dimensions shall be carried out in accordance with the provisions of Appendix A.8 Inspection rules8.1 Batching and sampling The rubber tracks are batched by 10 000 pieces (where the number is less than 10 000, they shall be counted as one batch), 8.2 Inspection classification 8.2.1 Ex-factory inspection The appearance quality of rubber tracks shall be 100% inspected before leaving the factory. 8.2.2 Type inspection All technical requirements listed in Chapter 6 are type inspection items. Type inspection shall usually be carried out in any of the following situations. 8.3 Determination rules 8.3.1 If any one of the appearance quality is unqualified, the track is unqualified; if the external dimensions are unqualified, then the batch of tracks is unqualified. 8.3.2 If any item of the physical and mechanical properties listed in Table 1 fails to meet the requirements, double the number of samples shall be taken from the same batch of tracks for retesting of the item. If the retest results are still unqualified, the batch of products shall be unqualified. 8.3.5 If the longitudinal design tension of the rubber track listed in 6.4 does not meet the requirements, double the number of samples shall be taken from the same batch of tracks for retesting of this item. If the retest results are still unqualified, the batch of products shall be unqualified. 8.3.6 If the bonding strength between wire cord (fiber cord) and rubber listed in Table 2 does not meet the requirements, double the number of samples shall be prepared from the same batch of rubber and wire cord (fiber) for retesting.9 Marking, packaging, transportation, storage and use9.1 Each rubber track shall be marked and accompanied by a product certificate (stamp). The certificate shall indicate. 9.2 When packing rubber tracks, plastic film is usually used and tied firmly with tape or woven cloth. It can also be packed according to user requirements. 9.3 During transportation, rubber tracks shall be protected from bumps and scratches, kept clean, and not dropped, dragged, rolled, or hooked or hung with hard objects. 9.5 Under the conditions specified in 9.3 and 9.4, the product performance shall comply with the requirements of this Standard within one year from the date of leaving the factory. 9.6 When selecting rubber tracks, users shall confirm the specific parameters in detail with the rubber track manufacturer. Various machines and equipment shall be matched with rubber tracks of specified specifications, and rubber tracks shall not be used on other models at will. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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