GB/T 1171-2017 (GBT 1171-2017)

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GB/T 1171-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.220.10
G 42
Replacing GB/T 1171-2006
Classical V-belt for general drive
ISSUED ON. FEBRUARY 28, 2017
IMPLEMENTED ON. SEPTEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Structures ... 4
4 Types and marks ... 5
5 Requirements... 6
6 Sampling ... 7
7 Test methods ... 8
8 Marking, labeling, packaging, transportation and storage ... 8
Annex A (informative) Reference rated power P1 and power increment △P1 of
a single piece of V-belt ... 10
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 1171-2006 “Classical V-belt for general drive”.
Compared with GB/T 1171-2006, the main technical changes except editorial
modification are as follows.
- DELETE the requirements for adapting the rope structure in the scope (see
Clause 1 of this Standard, Clause 1 of 2006 edition);
- MODIFY the representation method for the mark (see 4.2 of this Standard,
3.3 of the 2006 version);
- DELETE the requirements for the adhesion strength of ropes in physical
properties and its test methods (see 5.3 of this Standard, 5.3 and 7.3 of
2006 edition);
- MODIFY the inspection of the dimensions in the sampling (see 6.1 of this
Standard, 6.1 of 2006 edition);
- ADD the tables of reference rated power P1 and power increment ΔP1 of a
single piece of V-belt (see Annex A).
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of Subcommittee on Friction-type
Belt Drive of National Technical Committee on Pulleys and Belts of
Standardization Administration of China (SAC/TC 428/SC 3).
Drafting organizations of this Standard. Sanlux Co., Ltd., Zhejiang Sanwei
Rubber Item Co., Ltd., Zhejiang Hongda Rubber Co., Ltd., Wuxi Zhonghui
Rubber Technology Co., Ltd., Ningbo Kaichi Rubber Belts Co., Ltd., Qingdao
Product Quality Supervision and Testing Research Center.
Main drafters of this Standard. Shi Shuixiang, Liu Youliang, Dai Jianqiu, Zhu
Shusheng, Ying Jianli, Li Xiaodong.
The previous released versions replaced by this Standard are as follows.
- GB 1171-1974, GB 1171-1989, GB/T 1171-1996, GB/T 1171-2006.
Classical V-belt for general drive
1 Scope
This Standard specifies the structure, types and marks, requirements, sampling,
test methods and marking, labeling, packaging, transportation and storage of
classical V-belts (hereinafter referred to as V-belts) for general drive.
This Standard applies to classical V-belts used for general mechanical drive
devices.
This Standard does not apply to mechanical drive devices such as automobiles
and motorcycles.
2 Normative references
The 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 3686 Belt drives - V-belts and V-ribbed belts - Tensile strength and
elongation test method
GB/T 11544 Belt drives - Classical and narrow V-belts - Dimensions (system
based on datum width)
GB/T 12833 Rubber and plastics - Analysis of multipeak traces obtained in
determinations of tear strength and adhesion strength
GB/T 15328 Classical V-belts - Fatigue test - Non-loading method
3 Structures
3.1 V-belts are divided into two types according to the structure. wrap-edge V-
belt, cut-edge V-belts (classical cut-edge V-belts, grooved cut-edge V-belts and
bottom-rubber-embedded-cloth cut-edge V-belts).
3.2 The V-belt consists of rubber canvas (top cloth), top rubber, cushion rubber,
tensile member, bottom rubber, bottom cloth (bottom rubber-embedded cloth),
etc. (see Figure 1).
item, two additional samples shall be taken in the batch. If the test result is still
unqualified, this batch of products are determined as unqualified products. The
V-belt fatigue test shall not be less than once per season.
6.5 In the event of changing the line of production, transferring the factory,
resumption of production after production stoppage, or a major change in
structure, material or process, the V-belts shall be subjected to the type
inspection. For the type inspection of V-belts, the entire contents of Clause 5
shall be inspected.
7 Test methods
7.1 For the appearance quality of V belts, the damage of the angled canvas
and the length of the flash are measured with a tape or a caliper, and the rest
are checked by visual inspection.
7.2 The dimensions of V-belts are measured in accordance with the
specifications GB/T 11544.
7.3 The tensile strength and elongation at reference load of V-belts are tested
in accordance with the specifications of GB/T 3686. The reference load is as
specified in Table 3.
Table 3 -- Reference load parameters In kN
Type of V-belt Y Z A B C D E
Reference load 0.6 0.8 1.4 2.4 3.9 7.8 11.8
7.4 For the adhesion strength test between cloth and top rubber, first cut two
samples on the top of the V-belt. The samples are rectangular with a width of
10.0 mm ± 0.2 mm. If necessary, the thickness shall be appropriately thinned.
They are of sufficient length to allow the separation length during the
measurement to be no less than 100 mm. The holder moves at a speed of 100
mm/min ± 10 mm/min. The value is calculated according to GB/T12833, and
the arithmetic mean of the two samples is calculated.
7.5 The no-torque fatigue life and pulley center-to-center distance change rate
of V-belts is tested in accordance with the specifications of GB/T 15328.
8 Marking, labeling, packaging, transportation and
storage
8.1 Marking