GB/T 28267.4-2015Steel cord conveyor belts -- Part 4: Vulcanized belt joints (English PDF)

Foreword

GB/T 28267 consists of the following parts.

- Part 1. Design, dimensions and mechanical requirements for conveyor

belts for general use;

- Part 2. Preferred belt types;

- Part 3. Special safety requirements for belts for use in underground

installations;

- Part 4. Vulcanized belt joints.

This Part is the 4th part of GB/T 28267.

This Part was drafted in accordance with the rules given in GB/T 1.1-2009.

This Part uses translation method and identically adopts ISO 15236-4.2004

Steel cord conveyor belts - Part 4. Vulcanized belt joints.

This Part makes the following editorial modification.

- modified ">= 6.0" in Table 2 to "<= 6.0".

This Part was proposed by China Petroleum and Chemical Industry Federation.

This Part shall be under the jurisdiction of National Technical Committee on

Pulley and Belt of Standardization Administration of China (SAC/TC 428).

The drafting organizations of this Part. Zhejiang Double Arrow Rubber Co., Ltd.,

Shanxi Phoenix Tape Co., Ltd., Zhejiang Three-dimensional Rubber Products

Co., Ltd., Shandong Dawn Tape Limited, Shenyang Taifeng Tape

Manufacturing Co., Ltd., Yankuang Group Tangcun Industry Co., Ltd..

Main drafters of this Part. Zhuang Bingjian, Qu Wende, Zhang Guofang, Liu

Shengping, Wang Bo, Sun Guimei.

Steel cord conveyor belts - Part 4.

Vulcanized belt joints

1 Scope

This Part of GB/T 28267 specifies design, dimensions, requirements and

marking of vulcanized joints for steel cord conveyor belts.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

vulcanized joint

area within which the cords from two belt lengths are joined and vulcanized

through the surrounding rubber

3 Symbols and units

For the purposes of this Part, the symbols and units given in Table 1 apply.

Table 1 Symbols and units

4 Types of joints

5 Joint material

The joint material shall be chosen for the belt types to be joined, ensuring that

the material will not be spoiled by ageing.

6 Making the joint

The heating platens shall be at least 150 mm larger than the joint on both sides

in the longitudinal direction and shall at least cover the side irons in the

transverse direction.

The heating platens shall be loaded evenly with a pressure of at least 1 MPa.

Mechanical pressure equipment shall use a device to even out the applied

pressure.

Unless otherwise agreed between the manufacturer and purchaser, when

making the joint there shall be an equal thickness of the rubber between the

cords.

When making joints the following general guidance shall be observed.

- ensure a large adhesion area by beveling the cover transition zones;

- leave a coat of adhesion rubber on the cord;

- carefully fill the space between the cords with a sufficient quality of

adhesion rubber;

- use a material with a high adhesion.

In addition for interlaced stepped joints.

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