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GB/T 12753-2020 English PDF (GBT12753-2020)

GB/T 12753-2020 English PDF (GBT12753-2020)

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GB/T 12753-2020: Steel wire ropes for conveyer belts

This Standard specifies order content, requirements, test methods, inspection rules, packaging, quality guarantee period, transportation, storage, marks and quality certificate of steel wire ropes for conveyer belts. This Standard is applicable to galvanized steel wire ropes for steel wire rope core conveyor belt skeleton reinforcement material.
GB/T 12753-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.65
H 49
Replacing GB/T 12753-2008
Steel wire ropes for conveyer belts
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Order content ... 6
5 Requirements ... 6
6 Test methods ... 10
7 Inspection rules ... 12
8 Packaging, quality guarantee period, transportation, storage, marks and quality certificate ... 13
Annex A (normative) Minimum breaking force of steel wire rope structure, size and level ... 15
Annex B (informative) Spool for winding steel wire rope for conveyor belt ... 18 Bibliography ... 19
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 12753-2008 ?€?Steel wire ropes for conveyer belts?€?. Compared with GB/T 12753-2008, in addition to editorial modifications, the main technical changes in this Standard are as follows:
- modified the provisions on wire rod; added the provisions on technology agreement (see 5.1.1 of this Edition, 7.1.1 of Edition 2008);
- added the provisions on zinc ingot material (see 5.1.2 of this Edition); - modified ?€?steel wire in wire rope?€? to ?€?stranded steel wire?€? (see 5.2 of this Edition, 7.1 of Edition 2008);
- modified the provisions on the allowable deviation and out-of-roundness of stranded steel wire (see 5.2.1 of this Edition, 6.1 of Edition 2008);
- added and adjusted the level of steel wire ropes; modified to level I, level II, level III and level IV (see 5.2.2 of this Edition, 5.2 of Edition 2008); - adjusted the nominal tensile strength of steel wire to 2260MPa, 2360MPa, 2460MPa and 2560MPa (see 5.2.2 of this Edition, 7.1.2 of Edition 2008); - deleted level H of zinc layer weight; changed the symbol of the minimum zinc layer heavyweight to 30?? as level M, 60?? as level N (see 5.2.5 of this Edition, 5.3 of Edition 2008);
- modified the requirements for appearance quality (see 5.2.6, 5.3.1 of this Edition, 7.1.6, 7.2.3 of Edition 2008);
- deleted the provisions on diameter increase of center steel wire (see 7.2.1.2 of Edition 2008);
- modified the requirements for steel wire connector; specified that steel wires with a nominal diameter less than 0.40mm shall use plug-in
connector, steel wires with a nominal diameter greater than or equal to 0.40mm may use butt welding connector or plug-in connector (see 5.3.2
of this Edition, 7.2.1.3 of Edition 2008);
- adjusted and added nominal diameter of steel wire ropes; changed 6??19- WSC range to 6.0mm~15.0mm, 6??19W-WSC range to 6.0mm~15.0mm;
added some intermediate specifications (see 5.5.1, Annex A of this Edition, 6.3 of Edition 2008);
- modified the minimum breaking force and reference weight of steel wire Steel wire ropes for conveyer belts
1 Scope
This Standard specifies order content, requirements, test methods, inspection rules, packaging, quality guarantee period, transportation, storage, marks and quality certificate of steel wire ropes for conveyer belts.
This Standard is applicable to galvanized steel wire ropes for steel wire rope core conveyor belt skeleton reinforcement material (hereinafter referred to as "steel wire ropes".
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 228.1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 239.1, Metallic materials - Wire - Part 1: Simple torsion test
GB/T 470, Zinc ingots
GB/T 1839, Test method for gravimetric determination of mass per unit area of galvanized coatings steel products
GB/T 2104, Steel wire ropes - Packing, marking and certificate - General requirements
GB/T 8358, Steel wire ropes - Determination of measured breaking force
GB/T 8706, Steel wire ropes - Vocabulary, designation and classification GB/T 24242.2, Non-alloy steel wire rod for conversion to wire - Part 2: Specific requirements for general purpose wire rod
YB/T 081, Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy
The surface of steel wire rope shall be free of oil, water, dirt and other impurities. 5.3.2 Steel wire connector
Single-strand connectors are not allowed in the steel wire rope. The steel wire connectors shall also be minimized. When steel wires have to be connected during twisting, steel wires with a nominal diameter of less than 0.40mm shall have plug-in connectors; steel wires with a nominal diameter greater than or equal to 0.40mm may use butt welding connectors or plug-in connectors. The plugged wire ends shall be sealed inside the strands. They shall not be exposed. The wire at the splice is allowed to have partial crossing.
The distance between steel wire connectors in the same steel wire strand shall be greater than 100m.
5.3.3 Pre-deformation
Steel wire ropes shall be pre-deformed, without looseness, with small residual torsion, and no spring loops, waves, hard bends and other defects.
5.3.4 Structure
The steel wire rope shall be an open structure. According to its structure, it is divided into three types: 6??7-WSC, 6??19-WSC and 6??19W-WSC, as shown in
Annex A. After negotiation between the supplier and the purchaser, steel wire ropes of other structures can also be supplied.
5.3.5 Level of steel wire ropes
The steel wire ropes are divided into level I, level II, level III and level IV, as shown in Table 2.
5.3.6 Twisting direction and type of steel wire ropes
Steel wire ropes are divided into right twist (Z) and left twist (S) according to the twist direction. In general, the left twist and right twist shall be half and half at the time of delivery. It can also be adjusted according to user order
requirements. The twisting method of steel wire rope is alternating twist. 5.4 Marks and classification of steel wire ropes
The marks and classification of steel wire ropes shall meet the requirements of GB/T 8706.
5.5 Size of steel wire ropes
5.5.1 Diameter
The nominal diameter D and allowable deviation of steel wire ropes shall twist speed during the arbitration test is 1r/s.
6.1.4 The knotted tensile test is carried out in accordance with the provisions of GB/T 228.1.
6.1.5 The zinc layer weight test shall be carried out according to the provisions of GB/T 1839.
6.1.6 Use hand feeling and visual inspection to check the appearance quality. 6.2 Tests of steel wire ropes
6.2.1 Use hand feeling and visual inspection to check the appearance quality of steel wire ropes.
6.2.2 Untie the two opposite strands at either end of the steel wire rope, about two lay lengths. When the two strands are restored to their original positions and all constraints are lifted, the steel wires and strands in the steel wire rope remain in their original positions. When they do not unravel on their own, the steel wire ropes are not loose.
6.2.3 After removing the rope end by 1m~2m, bend into an angle of about 90?? at about 50mm from the rope end. Pinch this elbow tightly to avoid the steel wire rope spinning when pulling out a 6m long sample (not cut from the coil). Then, release the free section of the steel wire rope. Let it spin freely without tension. The number of rotations shall not exceed 3 revolutions (r), which means that the residual torsion of the wire rope is small.
6.2.4 The diameter of the steel wire rope shall be measured with a wide jaw Vernier caliper. The width of the jaw shall be sufficient to span two adjacent strands, as shown in Figure 1. The minimum resolution value of the Vernier caliper shall not exceed 0.02mm. The measurement shall be performed on a straight line 1m away from the end of the steel wire rope without tension. Measure a diameter on two cross-sections at least 1m apart and in the direction perpendicular to each other on the same cross-section. The average of the four measurements is used as the measured diameter of the steel wire rope. The measured diameter should comply with the allowable deviation specified in Annex A.
Figure 1 -- Measurement method for steel wire rope diameter
a) A sample is used for the actual breaking tensile test of the steel wire rope; b) Remove any 3 strands from another sample. 1 strand is for measurement of stranded steel wire diameter and tensile test. 1 strand is for twist test or knotted tensile test. 1 strand is for zinc layer weight test. The center steel wire and outer strand center wire are not tested for mechanical properties. 7.3.4 When a wire rope is cut into several pieces for delivery, several of them are also tested according to 7.3.1 and 7.3.3 as a coil.
7.4 Determination and reinspection rules
7.4.1 If all the tests meet the requirements, the batch (or strip) of steel wire ropes is accepted.
7.4.2 If one or more test items do not meet the specified requirements, then re- sample on the same steel wire rope for re-inspection of failed items. If the re- inspection result meets the specified requirements, the batch (or) of steel wire ropes is still accepted.
If one or more re-inspection results do not meet the specified requirements, this coil of steel wire ropes shall be rejected. The remaining wire ropes of this batch shall be sampled one by one for testing.
7.4.3 When a steel wire rope is cut into several pieces for delivery, choose one of them to sample and test. If conforming, the remaining items shall be exempt from the test, otherwise, samples shall be taken for the test one by one. 8 Packaging, quality guarantee period, transportation,
storage, marks and quality certificate
8.1 Packaging
8.1.1 Spool for winding steel wire rope
The spool for winding steel wire rope is made of high-quality and durable plywood. The model shall be indicated in the contract. The coil surface shall have an arrow sign for the direction of the line. Please refer to Annex B for the spool size of main models.
8.1.2 Rope winding steps
Before winding the rope, the wheel core and the inner side shall be lined with a layer of neutral moisture-proof paper or plastic film. When winding the rope, the steel wire rope shall be evenly and flatly wound on the spool. After winding the

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