This standard applies to uneven bars for gymnastics competitions and general practice. GB 8392-1987 Uneven Bars GB8392-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Uneven bars
This standard applies to uneven bars for gymnastics competition and ordinary practice. Bars
This standard refers to the 1979 International Gymnastics Federation gymnastics equipment standard. 1 Product classification
1.1 The types of uneven bars are divided into the following according to their usage: a. Competition type uneven bars,
Ordinary practice type uneven bars.
1.2 The basic size parameters shall comply with the provisions of Figure 1 and Table 1. Figure 1
Approved by the Ministry of Light Industry of the People's Republic of China on December 10, 198758
UDC 685.64
GB8392-87
Implemented on June 1, 1988
Inner distance S of longitudinal column
Low bar H,
High bar H
Bar surface section is oval
Adjustment width B of two columns,
Lifting distance of column
Center width B of column
Position of floor hook
Length of zipper after installation
Not more than
1.3 The main raw materials shall comply with the provisions of Table 2. Part name
Reinforcement in bar
2 Technical requirements
Basic size parameters shall be in accordance with the provisions of Figure 1 and Table 1. 2.2 Technical indicators shall comply with the provisions of Table 3.
Indicator name
GB 8392—87
Basic size
1450～1 650
2250~2450
Short diameter 42
Long diameter 48
550～1050
Spring steel
Static load 1350N,
Elastic force of bar surface
Straightness of bar surface
Tension of zipper, expansion line, joint
Compatibility
Corrosion resistance of electroplating layer
Deflection is 65±10mm.
Limit deviation
Ordinary practice type
Basic size
1 300～1 600
2100~2400
Short diameter 42
Long diameter 48
600～800
600~800
Limit deviation
Ordinary practice type
Steel pipe or other materials
Spring steel or other materials
Wood or other elastic materials
Cast iron or other steel
Take The deformation after eliminating external force is no more than 1mm
The deviation is no more than 3mm
No more than 8000N
The bar width adjuster is flexible to use,
The scale is accurate, the parts match tightly,
The tensioner is flexible to use
The corrosion resistance level is not less than level 7
Ordinary practice type
The static load is 1350N and the deflection is 65
15mm. Cancel external force deformation is not more than 3mm
Deviation is not more than 6mm
All parts are closely matched,
no looseness after fixation
Corrosion resistance level is not less than 5 level
3 Test method
Indicator name
Surface quality
GB 8392-87
Continued Table 3
Competition type
a. The wooden bar surface is round, smooth and straight, without cracks, decay and knots
b. The color of spray paint or baking paint is consistent and without bubbles, paint streaks, wrinkles and dirty spots
3.1 Specifications and dimensions are measured with vernier calipers, tape measures or special rulers with the same indication error. 3.2 Determination of the elastic force of the bar surface
Ordinary practice type
a. The wooden bar surface is round and smooth, without cracks or decay. There shall be no more than three live tree knots with a diameter of less than 8 mm at both ends 1.5m away from the middle section.
b. The paint color is uniform and consistent, without paint streaks and exposed bottom a: Competition type The bar surface is placed on two supporting points 2400mm apart (see Figure 2). The initial tension of the two bars should be the same. The steel wire rope connected to the ground fixed point and the bar support is adjusted to 2750N. A static load of 1350N is applied at the middle point of the bar. The deflection of the bar surface should be within the range of 65±10mm. After the external force is removed, the deformation of the bar surface should be no more than 1mm. b. Ordinary practice type A static load of 1350N is applied in the middle of the bar. The deflection of the bar surface should be within the range of 65±15mm. After the external force is removed, the measured bar surface should not be greater than 3mm.
3.3 Determination of the straightness of the bar surface Use a thin rope to pass through the bar surface axially to fix it and make it straight. Use a ruler to measure the straightness of the bar surface. It should meet the requirements of Table 3 (2).
3.4 ​​The tension of zippers, expansion cords and joints is measured by a tensile testing machine. 3.5 The fit of parts and the flexibility of adjusters and tensioners are measured by hand feel. 3.6 The corrosion resistance of the electroplating layer is tested for 24 hours according to GB5938 "Neutral Salt Spray Test (NSS) Method for Corrosion Resistance of Metal Coatings and Chemically Treated Layers of Light Industrial Products" and rated according to GB5944 "Evaluation of Corrosion Test Results of Metal Coatings of Light Industrial Products". 4 Inspection rules
4.1 The inspection of batch products is divided into batch inspection and periodic inspection. 4.2 Batch inspectionWww.bzxZ.net
4.2.1 Batch inspection shall be carried out in accordance with the one-time sampling plan for general inspection level I in GB2828 "Batch inspection sampling procedure and sampling table (applicable to inspection of continuous batches)".
4.2.2 The items and clauses, test method clauses and AQL values ​​of batch inspection shall be in accordance with the provisions of Table 4. 60
Basic size parameters
Elastic force of bar surface
Straightness of bar surface
Fitness
Surface quality
4.3 Periodic inspection
Clause of this standard
GB 8392—87
Test method clause
Competition type
Ordinary practice type
4.3.1 The samples for periodic inspection must be randomly selected from the qualified samples in 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 inspection shall be carried out every six months and shall also be carried out when the design, key process, main raw materials are changed or production is resumed after suspension for more than three months.
4.3.3 Periodic inspections shall be carried out in accordance with the provisions of the single sampling plan for the discrimination level II and the discrimination array (12) in GB2829 "Periodic Inspection Counting Sampling Procedure and Sampling Table (Applicable to the Inspection of Stability of Production Process)". 4.3.4 The items and clauses of periodic inspections, the test method clauses and their RQL values ​​shall be in accordance with the provisions of Table 5. Table 5
Zipper, expansion line, joint tension
Electroplating layer corrosion resistance
5 Marking, packaging, transportation, storage
Clause of this standard
Test method clause
5.1 Marking: The product shall have a trademark, factory name, certificate of conformity, product manual, and date of manufacture. 5.2 Packaging: According to different conditions in different regions, select packaging materials to protect the product. Competition type
5.3 Transportation: It shall not be exposed to rain, sun, or moisture during transportation. It shall be handled with care and shall not be squeezed or collided. 5.4 Storage: The warehouse should be well ventilated and dry (products are not allowed to be stored outdoors) and properly stored. Additional Notes:
Ordinary Practice Type
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 Dongfang Sports Equipment Factory, Beijing Sports Equipment Factory, and Chengdu Sports Equipment Factory.
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