GB/T 12736-2021Conveyor belts - Determination of strength of mechanical fastenings - Static test method (English PDF)

Foreword

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

This standard replaces GB/T 12736-2009 "Static Test Method for the Determination of the Strength of Mechanical Joints of Conveyor Belts", and is in line with GB/T 12736-2009

Compared with.2009, the main technical changes are as follows.

---Updated normative references (see Chapter 2, Chapter 2 of the.2009 edition).

This standard uses the redrafting method to amend and adopt ISO 1120.2012 "Determination of the static test method for the strength of mechanical joints of conveyor belts"

law".

Compared with ISO 1120.2012, there are technical differences between this standard, and the clauses related to these differences have been passed on the outer margins.

The vertical single line (|) of the setting is marked, and the technical differences and their reasons are as follows.

--- Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.

The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.

* Replace ISO 283 with GB/T 3690 which is equivalent to the international standard (see 5.2, Chapter 8).

This standard also made the following editorial changes.

---In accordance with the requirements of GB/T 1.1-2009, in the "Scope" chapter, "This standard applies to fabric core laminated conveyor belts and fabrics

The mechanical joint of the whole core conveyor belt";

---References are revised to Chinese documents.

This standard was proposed by the China Petroleum and Chemical Industry Federation.

This standard is under the jurisdiction of the National Belt Wheel and Belt Standardization Technical Committee Conveyor Belt Subcommittee (SAC/TC428/SC1).

Drafting organizations of this standard. Zhejiang Shuangjian Rubber Co., Ltd., Zhongnan Rubber Group Co., Ltd., Shandong Chenguang Adhesive Tape Co., Ltd.

Company, Zhejiang Sanwei Rubber Products Co., Ltd., Shandong Xiangtong Rubber and Plastic Group Co., Ltd., Baoding Huayue Tape Co., Ltd., Qingdao Technology

the University.

1 Scope

This standard specifies the static test method for the strength of mechanical joints of conveyor belts. The joint can be connected with a connecting shaft or not

Connect with connecting shaft.

This standard does not involve vulcanized joints.

This standard applies to the mechanical joints of fabric-core laminated conveyor belts and fabric-core conveyor belts.

This standard does not apply to the light conveyor belt specified in GB/T 39825 [1].

Note. This standard specifies that the purpose of this test is to prevent insufficient strength of the static mechanical joints of the conveyor belt. The dynamic test method standards for the joints will be developed in the future.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article

Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 3690 Fabric core conveyor belt full thickness tensile strength, elongation at break and reference force elongation test method

(GB/T 3690-2017, ISO 283.2015, IDT)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

Joint width widthoffastening

The number of joint units is multiplied by the pitch, or the number of hooks is multiplied by the pitch (see Figure 1).

3.2

Pitch

The distance from a point on a connecting unit or hook to the corresponding point on an adjacent unit or hook (see Figure 1).

4 Principle

Continuously increasing tensile force is applied to the specimen until the mechanical joint breaks and separates.

5 equipment

6 Sample

7 Test procedure

8 Results presentation

Calculate the average value of the breaking force of the three specimens.

a) The average value of the tensile strength of the joint, expressed in Newtons per millimeter of the joint width (see Figure 1 and Figure 2);

b) Joint strength, expressed as a percentage of the average tensile strength of the joint to the nominal tensile strength of the full thickness (see GB/T 3690).

9 Test report

The test report should include the following.

a) The name and number of this standard;

b) Joint width;

c) The brand and model of the connector;

d) Conveyor belt brand and model;

e) test results;

f) Joint failure form. for example, indicating whether the belt is torn or the connector is disconnected;

g) Condition adjustment and test temperature (see 6.4).