GB/T Translated English of Chinese Standard: GB/T

Transcription

1 Translated English of Chinese Standard: GB/T GB ICS G 42 National Standard of the People s Republic of China GB/T Replacing GB/T Classical V-belt for general drive 一般传动用普通 V 带 Issued on: December 29, 2006 Implemented on: June 1, 2007 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration Committee. Page 1 of 9

2 Table of Contents Foreword Scope Normative references Classification Requirements Sampling Test methods Signs, labels, packaging, storage, and transportation Page 2 of 9

3 Foreword This Standard replaces GB/T "Classical V-belts for general use". Compared with GB/T , the main changes in this Standard are as follows: DELETE the classical V-belts with ply structure; DELETE the requirements for adhesion strength between cord plies of V-belts and the structure diagram (4.2 and Figure 1b of 1996 version); DELETE the requirements for first-class products of V-belts. IMPROVE the requirements for tensile strength, reference force elongation, cord adhesion strength, and fatigue life of qualified products of V-belts (4.2 of 1996 version; 5.3 of this version); ADD the structure diagram of cutting-side V-belts (see Figure 1); ADD the requirements for adhesion strength between wrapped V-belts and rubber bushing, and between cutting-side V-belts and rubber bushing (see 5.3); This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of the Chemical Industrial Adhesive Tape Standardization Technical Focal Point. Drafting organizations of this Standard: Zhejiang Sanlux Rubber Co., Ltd., Zhejiang Sanwei Rubber Products Co., Ltd., Zhejiang Hongda Rubber Co., Ltd., Qingdao Rubber Industry Research Institute, Zibo Lvxiang Rubber Factory, and Henan Weishi County Zhongyuan Rubber Co., Ltd. Main drafters of this Standard: Shi Shuixiang, Liu Youliang, Yan Mingliang, Zhao Shaoying, Tang Youlang, Hand Deshen, and Zhang Qingjun. The previous editions replaced by this Standard are: GB , GB , GB/T Page 3 of 9

4 Classical V-belt for general drive 1 Scope This Standard specifies the classification, structure, requirements, test methods and sings, labels, packaging, storage, and transportation of classical V-belts for general drive (hereinafter referred to as V-belts). This Standard applies to classical V-belts with cord structure for general mechanical transmission devices. This Standard does not apply to the classical V-belts with ply structure, and the mechanical transmission devices such as vehicles, agricultural machinery, and motorcycles. 2 Normative references The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 3686 V-belts Tensile strength and elongation test method GB/T 3688 V-belts Cord adhesion test method GB/T Classical and narrow V-belts Dimensions (GB/T , NEQ ISO 4184:1992) GB/T Rubber and plastics Analysis of multi-peak traces obtained in determinations of tear strength and adhesion strength (GB/T , ISO 6133:1998, IDT) GB/T Classical V-belts Fatigue test (non-loading method) 3 Classification 3.1 Type The type of V-belts is divided into wrapped V-belts and cutting-side V-belts (classical cutting-side V-belts, toothed cutting-side V-belts, and rubber-lined-with-cloth Page 4 of 9

5 production is resumed after shutdown, or there are significant changes in structure, material or process, then the V-belts need to be conducted for type inspection. When conducting type inspection for V-belts, it shall inspect the entire contents in Chapter 5 "Requirements" of this Standard. 7 Test methods 7.1 The dimension of V-belts shall be measured according to the provisions of GB/T The tensile strength and reference force elongation of V-belts shall be tested according to the provisions of GB/T The reference force shall in accordance with the provisions in Table 3. Model of V-belts Reference force/kn Table 3 Reference force parameter Y Z A B C D E The cord adhesion strength of V-belts shall be tested according to the provisions of GB/T For the test of adhesion strength between the cloth and rubber bushing, firstly CUT two pieces of samples on the top of V-belts. The sample is rectangular, with a width of 10.0mm±0.2mm, if necessary, the thickness shall be appropriately thinned. And the sample shall have sufficient length to make the separating length during measurement process not less than 100mm. The moving speed of gripper is 100mm/min±10mm/min. OBTAIN the values according to GB/T 12833, and then calculate the arithmetic average of the two samples. 7.5 The non-loading fatigue life of V-belts and variation rate of center distance of belt pulley shall be tested according to the provisions of GB/T Signs, labels, packaging, storage, and transportation 8.1 Signs Each piece of V-belt shall have obvious signs that can not be washed off by water. It shall include the following contents: a) Manufacturer's name and trademarks; b) Marks; c) Group-matching codes; Page 8 of 9

6 d) Manufacturing year and month. 8.2 Labeling and packaging V-belts are tied by model and reference length. Each bundle of V-belts shall have same-marks and same-group-matching codes. And it shall use appropriate methods to package the products. It shall enclose labels in the package, on which it shall include the following contents: a) Manufacturer's name and trademarks; b) Marks and the materials of belt core; c) The number of V-belts in the packaging; d) Qualified seal of quality inspection department; e) Use and maintenance conditions of V-belts. 8.3 Storage and transportation During the storage and transportation of V-belts, it shall avoid direct sunlight or being drenched by rain and snow, and keep clean; PREVENT the contact with acids, alkalis, oils, and organic solvents that may affect the quality of V-belts; PREVENT mechanical damages, and keep 1m away from heating devices When storing, the temperature in warehouse shall be kept between -18 C~ + 40 C During the storage period, it shall avoid deformation of V-belts from withstanding too much weight. It is the best to hang the V-belts on the crescent-shaped shelves or place flatly on the shelves When having been stored for no more than 1 year under the above conditions, the properties of V-belts shall still comply with the provisions of this Standard. END Page 9 of 9