This standard specifies the method for determining the longitudinal tensile strength of steel cord conveyor belts. This standard is not applicable to the determination of the tensile strength of other conveyor belt structures. GB/T 5754-1986 Determination of the longitudinal tensile strength of steel cord conveyor belts GB/T5754-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of Longitudinal Tensile Strength of Steel Cord Conveyor BeltsSteel cord conveyor belts--
Longitudinal traction test-
Measurement of tensile strengthThis standard specifies the method for determining the longitudinal tensile strength of steel cord conveyor belts. This standard is not applicable to the determination of tensile strength of conveyor belts with other structures. UdC 621.867.21
GB 5784—86
This standard refers to the international standard ISO7622/2-—1984 "Determination of Longitudinal Tensile Strength of Steel Cord Conveyor Belts". Test principle
Longitudinal tensile force is applied to the sample at a constant machine speed. Under this force, only one steel wire rope of the sample bears the tension, and the force required to break the steel wire rope is measured.
2 Test equipment
Use a tensile testing machine with the following characteristics: The testing machine should have a maximum load indicator and a clamp that automatically clamps the sample. The clamp should be able to clamp the sample well and push.
During the entire test, there will be no slipping, no wire rope breaking, and no other inadaptable phenomena. This standard recommends the use of sliding cross-tooth clamps (as shown in Figure 1) or ball cross-tooth clamps (as shown in Figure 2). The length of the cross-tooth clamp is at least 80mm.
The measurement error of the testing machine should not be greater than 0.4% of the range. b.
This test should use a non-inertial dynamometer. When using an inertial dynamometer, the measured force should be limited to between 15% and 85% of the range. The speed of the testing machine can be adjusted to 100±10mm/min. The distance between the two clamps can be adjusted to more than 250mm. Figure 1 Sliding cross-tooth clamp
National Bureau of Standards 1986-01-07 Issued
1986-10-01 Implementation
3 Sample preparation
GB5754-86
Figure 2 Ball cross-tooth clamp
3.1 Take 4 samples from the conveyor belt sample (the twist direction of the central root wire rope: 2 are in the Z direction and the other 2 are in the S direction). Its shape and size should comply with Figure 3. Its length is shown in Table 1. Its width is to include 5 or 3 wire ropes, and its thickness is the full thickness of the belt. 8.2 The sample should be cut at a position at least 50mm away from the edge of the belt and without a wire rope joint, and parallel to the longitudinal axis of the conveyor belt. 3.3 The distribution position of the 4 samples should be representative of the different parts of the sample and should not be too concentrated. 3.4 When cutting the specimen, the steel wire rope that bears the tension in the center of the specimen shall not be damaged. 3.5 In Figure 3, the rubber around the steel wire rope in the middle 50mm section of the specimen can be removed with a knife or other tools close to the joint surface of the rubber and the steel wire rope.
3.6 If the specimen is too thick to fit into the clamp, the upper and lower covering rubber of the clamped parts of the specimen about 100mm at both ends can be appropriately thinned (see Figure 3)
Figure 3 Specimen
Nominal tensile strength of tape, N/mm
≤2000
Storage and test conditions
GB 5754--86
Table 1 Total length of specimen
Total length of specimen L, m
4.1 The specimen shall be cut at least 24 hours after the product is manufactured, and the cut specimen shall be placed at standard temperature and temperature conditions for at least 16 hours before the tensile test.
In case of quality dispute, the parking time can be extended to five days or agreed upon by the disputing parties. 4.2 The standard test temperature is 23± 2 C, and the standard relative humidity is 60% ~70%. 5 Test steps
5.1 Clamp the two ends of the sample in the upper and lower clamps of the testing machine respectively. The distance between the clamps should be at least 250mm or 30 times the diameter of the tested wire rope. The longitudinal axis of the sample and the force line should coincide with each other. 5.2 Carry out continuous tensile tests at a constant machine speed of 100±10mm/min. The maximum load value when the sample breaks is read as the breaking force. If the sample slips, breaks in the clamped part or other abnormal phenomena occur, the test results will be invalid. 6 Test results
The average breaking force F of a single steel wire rope is calculated according to formula (1): 6.1
F-+F-+F++F
Wherein: F——-The average breaking force of a single steel wire rope of the specimen, N, FF.F, F.-
-are the breaking forces of four specimens, N. 6.2 The longitudinal tensile strength R of the tape is calculated according to formula (2): R
Wherein: R-
-Tensile strength in the longitudinal direction of the tape, N/mm
-The average breaking force of a single steel wire rope of the specimen, N: C—-The total number of longitudinal steel wire ropes of the tape, L——Nominal width of the tape, mm.
Test report
The test report shall include the following contents:
The number of this standard,
The type, specification, batch number and manufacturer of the sample, the sample storage time,
Test temperature and humidity;
Test single value and F value of Article 6.1,
R value of Article 6.2,bZxz.net
GB 5754—86
Abnormal phenomena during the test and important optional details not specified in this standard, test date,
Tester.
Additional remarks:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by Qingdao Sixth Rubber Factory. The main drafter of this standard is Ding Bing.
This standard is entrusted to Qingdao Rubber Industry Research Institute for interpretation. This standard also refers to the Japanese standard JIS K6369-1979 "Wire Cord Conveyor Belt", the Federal German standard DIN 2231-1965 "Wire Cord Conveyor Belt", and the Australian standard AS1333-1980 "Wire Cord Synthetic Rubber Conveyor Belt".
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