This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of machine belt buckles. This standard applies to machine belt buckles used with parallel transmission belts and conveyor belts from No. 15 to No. 75. QB/T 2291-1997 Machine belt buckles QB/T2291-1997 Standard download decompression password: www.bzxz.net

Since the release of QB/T2291-1997
Machine Belt Buckle Professional Standard (ZBJ47009) in September 1989, after years of practical use, its main technical indicators have met the industry requirements. Therefore, this standard has only been edited according to GB/T1,1-1993 Standardization Work Guide Unit 1: Drafting and Expression Rules of Standards Part 1: Basic Provisions for Standard Writing. Appendix A of this standard is a prompt appendix. This standard was proposed by the Quality Standard Promotion Department of China Light Industry Association. This standard promotion is under the jurisdiction of the National Tool Hardware Standardization Center. The drafting units of this standard are: Shanghai Tool Industry Research Institute, Shanghai Machine Belt Buckle Factory. The main drafters of this standard are: Lu Xialing, Zhang Pinrong. This standard is entrusted to the National Tool Hardware Standardization Center for interpretation. 671
1 Scope
Light Industry Standard of the People's Republic of China
Machine Belt Buckles
QB/T22911997
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of machine belt buckles. This standard applies to machine belt buckles used with parallel transmission belts and conveyor belts No. 15 to No. 75. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the new versions of the following standards. GB/T343——1994 Low carbon steel wire for general purpose GB/T700-1988 Carbon structural steel
GB/T716-1991 Carbon structural steel cold rolled steel strip Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB/T 28281987
GB/T5305--1985 Hand tool packaging, marking, transportation and storage 3 Product classification
3.1 Type
The type of machine belt buckle is shown in Figure 1.
Figure 1 Machine belt buckle
No. 115 machine belt buckle has no a tooth.
2 The large tooth angle α is 74°±2°.
3.2 Basic size
The basic size of machine belt buckle shall comply with the provisions of Table 1. Approved by China Light Industry Federation on April 10, 1997, implemented from December 1, 1997, standard number, basic size, limit deviation, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, basic size, number of teeth per tooth, 4 technical requirements, QB/T2291-1997, basic size, basic size, basic size, 4.1 The material of machine belt buckle should be Q195-A.F, Q215-AF and Q235-AF steel specified in GB/T700. After cold rolling, it shall meet the requirements of Q195-AF-PI-BQ-BR, Q215-AF-PI-BQ, BR, Q235-AF-PI-BQ-BR steel strips specified in GB/T716. 4.2 The surface color of machine belt buckles shall be uniform and bright, without rust spots, obvious black spots or peeling. 3 The teeth of machine belt buckles are arranged neatly. Except for the first tooth, the straightness of the tooth ends of any five adjacent teeth shall not exceed 0.5mm. 4.3
4.4 There shall be no cracks on the outer wall of the root bend of the large teeth of machine belt buckles, and the root cracks of small teeth shall not exceed the tooth surface width of 0.25mm. Machine belt buckles should not have cracks after the flattening test. 4.5
5 Test method
5.1 Appearance inspection
Visual inspection.
2 Geometric dimension inspection
Use an angle ruler and a vernier caliper with an indication of 0.02mm or other common measuring tools. 5.3
Tooth end straightness inspection
Place the tooth end close to the blade. Use a feeler gauge to measure the maximum gap value. 5.4 Flattening test
Hit the back of the belt buckle with a hammer machine to make the inner diameter of the bend close to the diameter of the bamboo pin, and check for cracks. 6 Inspection rules
6.1 Products should be inspected and qualified before they can leave the factory with a product certificate. 6.2 The delivery inspection of products shall be carried out item by item according to the secondary normal inspection sampling plan of GB/T2828. The classification of unqualified products, inspection items, qualified quality level (AQL), ​​and inspection level (IL) shall be as specified in Table 2. 673
Classification of non-conformity
QB/T 2291-1997
Table 2 Classification of non-conformity, inspection items, qualified quality level and inspection level Inspection items
Knock fan test
Big and small tooth root cracks
Big tooth angle
Other items
Qualified quality level (AQL)
6.3 If there are special requirements for machine belt buckles, they can be negotiated and decided by both the industry and the trade. 6.4 Re-inspection rules
Inspection level (IL)
For batches that fail the delivery inspection, the manufacturer can select and sort them out before submitting them for acceptance. The manufacturer shall be responsible for replacing the non-conforming products in the random inspection samples.
7 Marking, packaging, remote transmission, storage
Marking, packaging, transportation and storage shall comply with the provisions of standard GB/T5305. 7.1bzxZ.net
The quantity per box shall comply with the provisions of Table 3.
Table 3 Quantity per box
Specification, number
Number of belt buckles, pieces
Number of bamboo joint pins, roots
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QB/T2291—1997
Appendix A
(Suggested Appendix)
Machine belt buckle bamboo joint pin
A1The material of the bamboo joint pin shall comply with the SZ-F galvanized steel wire specified in GB/T343. A2
The imprint of the bamboo joint pin shall be clear, and there shall be no obvious horseshoe shape, burrs or bending at the end. A3
3The type and basic size of the bamboo joint pin shall comply with the provisions of Figure A1 and Table A1. Bamboo pin
Basic dimensions
Limit deviation
Basic dimensions
Limit deviation
Basic dimensions
Basic dimensions
Basic dimensions
Basic dimensions of bamboo pin
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