This standard specifies the method for determining the pull-out bond strength between the steel cord and its rubber coating of a steel cord conveyor belt (including the bond strength in the original state and the bond strength after heat aging). This standard applies to conveyor belts with steel cord skeletons. GB/T 5755-2000 Determination of bond strength of steel cord for steel cord conveyor belts GB/T5755-2000 Standard download decompression password: www.bzxz.net

GB/T5755—2000
This standard is equivalent to the international standard ISO7623:1996 "Wire Cord Conveyor Belts-Rope and Cover Adhesion Test-Test in Original State and after Thermal Aging".
The main differences between this standard and ISO7623:1996 are: this standard makes specific provisions for the tensile testing machine, while ISO7623:1996 does not make specific provisions for the tensile testing machine, and only stipulates that the testing machine that meets the requirements of ISO7622-2 should be used; this standard has provisions for the sampling position, while ISO7623:1996 does not make any requirements. Compared with GB/T57551986 "Determination of Bond Strength of Steel Wire Cord Conveyor Belts", this standard only adopts the flat vulcanizer thermal aging method, and cancels the original standard's use of the thermal aging box heating aging method. This standard replaces GB/T5755-1986 from the date of implementation. This standard was proposed by the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Ministry of Chemical Industry's Adhesive Tape Standardization Technical Unit. This standard was drafted by Fuxin Rubber Co., Ltd. The main drafters of this standard are: Jin Guiju, Xing Lei, Sha Xuemei, Li Guiyun, Li Hongxing. 61
GB/T5755—2000bzxz.net
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standardization bodies (ISO member groups). The work of formulating international standards is generally organized by ISO's technical committees. If each member group is interested in a certain aspect of an established technical committee, it has the right to send representatives to attend the meetings organized by the technical committee. Some international organizations (governmental or non-governmental) associated with ISO also participate in the relevant work. ISO has close cooperation with the International Electrotechnical Commission (IEC) on all matters of electrical standardization. Draft international standards adopted by each technical committee must be circulated to each member group for submission. If at least 75% of the member groups vote in favor, the draft can be published as a formal international standard. The international standard ISO 7623 was prepared by ISO/TC 41 Technical Committee \Belts and pulleys (including V-belts)\, Subcommittee SC3 \Conveyor belts.
This second edition replaces the first edition (ISO 7623:1984) and is technically revised. 62
1 Scope
National Standard of the People's Republic of China
Steel cord conveyor belts-Wire rope
Determination of bond strength
Steel cord conveyor belts-Cord-to-coating bond testGB/T 5755--2000
eqv ISO 7623:1996
Replaces GB/T5755—1986
This standard specifies the method for determining the pull-out bond strength (both in the original state and after heat aging) between the steel cord of a steel cord conveyor belt and its coating rubber. This standard applies to conveyor belts with steel wire rope core skeletons. 2 Test principle
Apply longitudinal tensile force to the sample at a constant machine speed to measure the force required to pull a steel wire rope out of the sample. 3 Test device
3.1 Tensile testing machine 13
a) The testing machine has a maximum force indication device and a clamp that automatically clamps the sample. The clamp has a good grip on the sample and does not slip or break the steel wire rope during the entire test process, nor does it have other unsuitable phenomena. b) The force measurement error of the testing machine should be less than 0.4% of the range. c) 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. d) The speed of the testing machine can be adjusted to (100 ± 10) mm/min. e) The distance between the two clamps can be adjusted to more than 250 mm. 3.2 Flat vulcanizing machine
The vulcanizing machine has two hot plates with adjustable temperature of (145 ± 5) ℃, which can apply 1MPa~5MPa pressure to the sample. 4 Sample preparation
4.1 Samples in the original state
4.1.1 Cut three samples with the following dimensions from the conveyor belt sample: a) Length (along the longitudinal direction of the belt): when the rope diameter is less than or equal to 5mm, the minimum sample length is 350mm, when the rope diameter is greater than 5mm, the minimum sample length is 450mm; b) Width: should include five longitudinal steel wire ropes; c) Thickness: the thickness of the belt (including the covering rubber). 4.1.2 The sample should be cut at a position at least 50mm away from the edge of the belt and without a steel wire rope joint, and parallel to the longitudinal center line of the belt. Instructions for use:
1]ISO7623:1996 stipulates that a tensile testing machine that meets the requirements of ISO7622-2 should be used. Approved by the State Administration of Quality and Technical Supervision on August 28, 2000, and implemented on March 1, 2001
GB/T5755--2000
4.1.3 The positions of the three samples should be evenly distributed on the width of the original belt and should not be too concentrated7.4.1.4 In the middle of the sample, mark the end line of the test section. The length L of the test section is determined according to Table 1. Table 1 Relationship between the length L of the test section and the rope diameter DRope diameter D
Length L
2
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