This standard applies to the horizontal bar used for gymnastics competition and general practice. GB 8390-1987 Horizontal Bar GB8390-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Horizontal bar
This standard applies to horizontal bars for gymnastics competitions and ordinary practice. This standard refers to the international standard ISO379--1980 "Horizontal bar". 1 Product classification
1.1 The types of horizontal bars are divided into: a: competition type horizontal bar;
b, ordinary practice type horizontal bar according to their different uses.
1.2 Basic size parameters should comply with the provisions of Figure 1 and Table 1. Figure 1
Bar height H
Center distance between two holes of horizontal bar S
Diameter of horizontal bar d
Lifting distance of column
Position of floor hook
Length of zipper after installation L shall not exceed
Basic size
Competition type
Limit deviation
2 550~2 750
1.3 The main raw materials shall comply with the provisions of Table 2. Approved by the Ministry of Light Industry of the People's Republic of China on December 10, 1987 ±3
Basic size
UDC 685.64
GB8390-87
Ordinary practice type
Limit deviation
1 500～2 600
Implemented on June 1, 1988
2 Technical requirements
Parts name
GB 8390-87
Competition type
Spring steel or stainless steel
2.1 The basic size parameters of the horizontal bar shall be as specified in Figure 1 and Table 1. 2.2 The technical indicators shall comply with the provisions of Table 3.
3 Test method
Indicator name
Elastic force of bar surface
Stretch and zipper tension
Compatibility
Corrosion resistance of electroplating layer
Internal quality of horizontal bar
Competition type
Act a static load in the middle of the horizontal bar
2200N, deflection 90±10mm
Cancel external force, deformation does not exceed 1mm
Not less than 8000 N,
Flexible use of tensioner
After the horizontal bar is fixed on the column, it should move freely in all directions, and the noise generated in any direction should be extremely small
Corrosion resistance level is not less than 7
No defects such as cracks and impurities are allowed
3.1 Specifications and dimensions are measured with vernier calipers, steel tape measures or special rulers with the same indication error. Ordinary practice type
Spring steel or medium carbon steel
Ordinary practice type
Act a static load of 2200N in the middle of the horizontal bar, with a deflection of 100±20mm
Cancel the external force, and the deformation does not exceed 3mm
Not less than 6 000 N,
The tensioner is flexible to use
The connection between the bar support and the bar surface is allowed to have a slight swing in the lateral direction, and can rotate up and down freely
Corrosion resistance level is not less than 5 levels
3.2 Bar surface elasticity test, place the horizontal bar on two fulcrums 2550mm apart (see Figure 2); add a static load of 2200N at the midpoint, and the bar surface deformation after canceling the external force (the tension of the four steel cables must be 1400N), the competition type does not exceed 1mm, and the ordinary practice type does not exceed 3mm. 2200N
3.3 Pulling force of pull rod and zipper
GB8390—87
Measured by tensile testing machine or other tensile equipment with tensile weight. 3.4 Compatibility
Measured by sense organ.
3.5 Corrosion resistance of electroplating layer
Tested for 24 hours according to GB5938 "Neutral salt spray test (NSS) method for corrosion resistance of metal coating and chemical treatment layer of light industrial products", and rated according to GB5944 "Evaluation of corrosion test results of metal coating of light industrial products". 3.6 Internal quality of horizontal bar
Measured by flaw detector.
4 Inspection rules
4.1 Inspection of batch products is divided into batch inspection and periodic inspection. 4.2 Batch inspection
4.2.1 Batch inspection shall be carried out in accordance with the provisions of the single sampling plan of Level 1I of GB2828 "Batch inspection sampling procedure and sampling table for counting".
(applicable to inspection of continuous batches)" General inspection 4.2.2 The items and clauses of batch inspection, test method clauses and AQL values ​​shall be in accordance with the provisions of Table 4. Table 4
Basic size parameters
Elasticity of bar surface
Internal quality of cross bar
Compatibility
4.3 Periodic inspection
Clause of this standard
Test method clause
Competition type
Ordinary practice type
4.3.1 The samples for periodic inspection must be randomly selected from the qualified samples of batch inspection and all of them shall be inspected according to the batch inspection items. If unqualified products are found, they shall be replaced with qualified products. 4.3.2 Periodic inspections shall be conducted every six months and also when the design, key process, main raw materials are changed or when production is resumed after more than three months of suspension.
4.3.3 Periodic inspections shall be conducted in accordance with the one-time sampling plan of the discrimination level II, discrimination array (12) in GB2829 "Periodic Inspection Counting Sampling Procedure and Sampling Table (Applicable to the Inspection of Production Process Stability)". 4.3.4 Periodic inspection items and clauses, test method clauses and their RQL values ​​shall be in accordance with the provisions of Table 5. Table 5
Strength of pull bars and zippers
Corrosion resistance of electroplating layer
5 Marking, packaging, transportation, storage
Clause of this standard
Clause of test method
5.1 Marking: The product shall have a trademark, factory name, certificate of conformity, product manual, and date of manufacture. 5.2 Packaging: Select packaging materials to protect the product according to different conditions in different regions. Competition type
5.3 Transportation: Do not expose to rain, sun or moisture during transportation. Handle with care and avoid squeezing or collision. RQL
Ordinary practice type
GB8390-87Www.bzxZ.net
5.4 Storage: The warehouse should be ventilated and dry (products are not allowed to be stored in the open air) and properly kept. Additional instructions:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the National Stationery and Sports Goods Standardization and Quality Inspection Center. This standard was drafted by Shanghai Stationery and Educational Goods Industry Research Institute, Tianjin Chunhe Sports Goods Factory, Shanghai Sports Equipment Factory No. 1, Guangzhou Oriental Sports Equipment Factory, Beijing Sports Equipment Factory, and Chengdu Sports Equipment Factory. 52
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