Some standard content:
Industry Standard of the People's Republic of China
Bicycle Industry Standard
1993-04-—15 Issued
1993-07-29
1993—12—01 Implementation
199403--01
Ministry of Light Industry of the People's Republic of China
WQB 1714-93
Household Bicycle
QB/T 1715—93
QB/T 1716—93
QB/T 1717--93
QB/T 1718—93
QB/T 1719—93
QB/T1720-93
QB/T1721--93
QB/T 1722--93
QB/T 1723-93
QB 1724—93
QB 1802-—93
Naming and model compilation method
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Handlebar:
Ordinary front and rear brakes·
Caliper brake·
Chain guard·
Bell·
Insurance document
Rim·
W+(21)
*-( 61)
（86)
+(33 )
.--(99)
-(111)
Subject content and scope of application
Industry Standard of the People's Republic of China
Bicycle chain cover
QB/T1721-93
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle chain covers (hereinafter referred to as "chain covers"). This standard applies to general bicycle chain covers as specified in QB1714 "Bicycle Naming and Model Compilation Method". 2 Reference standards
GB2828
Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches)GB2829
Count sampling procedures and sampling tables for periodic inspection (applicable to inspection of stability of production process)GB12742 Technical conditions for bicycle testing equipment and instrumentsQB/T1217 Technical conditions for bicycle electroplating
QB/T1218
3 Product classificationWww.bzxZ.net
3.1 Quarter chain cover
Technical conditions for bicycle paint
Can cover the upper part of the chain and the part above 90° from the starting point of the sprocket and chain meshing. See Figure 1 for an example.2
One chain cover body! 2-front splint; 8-front connecting piece, 4-rear splint, 5-bent splint Figure
Approved by the Ministry of Light Industry of the People's Republic of China on April 15, 1993-86-
Implemented on December 1, 1993
W3.2 Half chain cover
QB/T1721-93
Can cover the outer side of the chain and sprocket, but there is no inner cover shell equivalent to the full chain cover. For example, see Figure 2. 1-rear splint: 2-chain cover body, 8-front plate: 4-chain cover Figure
3.3 Full chain cover
Can completely cover the chain and sprocket. See Figure 3 for an example. 2
1—rear connector of the housing: 2—outer plug, 8—oil hole cover: 7—rear clamp: 8—outer housing;
6—fastening lining;
11—chain housing:
4—oil hole seat; and—inner plug housing
9—inner housing: 10—front plug
12—front clamp, 13—front fixed clamp; 14—front inner clamp Figure 3
WwW.87
3.4 Chain cover
QB/T1721--93
A circular cover covering the outer side of the sprocket. See Figure 4 for an example. Figure
4 Technical requirements
4.1 Appearance
The chain cover edge shall not have burrs, sharp edges shall not be exposed, the surface shall be flat, the shape shall be correct, there shall be no cracks and other obvious defects, and there shall be no obvious wrinkles on the front view. 4.2 Chain cover rivet welding firmness
The chain cover rivet welding part shall be firm, and a force of 196N shall be applied to the rivet welding part, and there shall be no falling off after 30B. 4.3 Quality of painted parts
4.3.1 Appearance of paint film
The full chain cover shall comply with the provisions of QB/T1218 Article 4.1 Class I parts, and the quarter chain cover, half chain cover, and plate chain cover shall comply with the provisions of QB/T1218 Article 4.1 Class II parts: 4.3.2 The impact resistance of the paint film shall comply with the provisions of QB/T1218 Article 4.2. 4.3.3 Paint film corrosion resistance
Full chain cover shall comply with the provisions of QB/T1218 Article 4.3 - Class parts, quarter chain cover, half chain cover, and disc chain cover shall comply with the provisions of QB/T1218 Article 4.3 Class II parts. 88
4.3.4 Paint film hardness
QB/T.1721—93
Full chain cover shall comply with the provisions of QB/T1218 Article 4.1 Class I parts, quarter chain cover, half chain cover, and disc chain cover shall comply with the provisions of QB/T1218 Article 4.4 Class II parts. 4.4 Electroplated parts quality
4.4.1 The surface roughness Ra of chrome-plated parts shall not exceed
1.6μm.
4.4.2 The corrosion resistance of chrome-plated parts shall comply with the provisions of Article 5.4.1 of QB/T
1217 for Class I parts.
4.4.3 The appearance quality of chrome-plated parts shall comply with the provisions of Article 5.1.1 of QB/T
1217 for Class I parts.
4.4.4 The thickness of zinc coating shall comply with the provisions of Article 5.3.1 of QB/T1217 for Class I parts.
5 Test methods
The testing equipment and instruments used in the tests of this chapter shall comply with the provisions of CB12742.
5.1 Chain cover appearance test
Use daily measurement to feel
The solidity test of the riveted welding part
Fix the cover body shell and the plug shell
on a special testing machine respectively, apply 196N force on the front and rear joints, and observe whether there is any falling phenomenon after 30%
(see Figure 5 and Figure 6)
5.3 Paint quality test
5.3.1The test of paint film appearance shall be in accordance with the provisions of Article 5.1 of QB/T1218. 6
5.3.2The test of paint film impact resistance shall be in accordance with the provisions of Article 5.2 of QB/T1218, and the test part is the outer side of the chain cover. -89
Q8/T 1721—92
5.3.3 The test of the anti-corrosion ability of the paint film shall be in accordance with the provisions of Article 5.3 of QB/T1218, and the corrosion position is shown in Figure 7.218
5.3.4 The test of the hardness of the paint film shall be in accordance with the provisions of Article 5.4 of QB/T1218, and the test position is the outer side of the chain cover. 5.4 Quality test of electroplated parts
5.4.1 The surface roughness of chrome-plated parts shall be compared with the sample blocks that meet the surface roughness of chrome-plated parts in Appendix A of QB/T1217. 5.4.2 The anti-corrosion ability test of chrome-plated parts shall be in accordance with the provisions of Article 5.4.2 of QB/T1217. 5.4.3 The appearance of chrome-plated parts shall be inspected by visual inspection.
The zinc coating thickness test is in accordance with the provisions of Article 3.2 of QB/T1217. 5.4.4
6 Inspection rules
6.1 Products must be inspected and qualified by the quality inspection department of the manufacturer and accompanied by a certificate of conformity before they can leave the factory. 6.2 Unit product: only,
6.3 Factory inspection
GB2828 is used.
6.3.1 Sampling plan: secondary sampling plan. 6.3.2 Batch quality: calculated by the number of unqualified products per 100 units of products. 6.3.3 Inspection items, inspection level (IL), unqualified classification, and qualified quality level (AQL) are shown in Table 1. 90 -
Appearance of chain cover
Appearance of paint film
Firmness of rivet welding
Appearance of chrome-plated parts
Roughness
Articles of this standard
6.4 Type inspection: GB2829 is adopted.
6.4.1 Sampling plan: Secondary sampling plan
QB/T1721—93
6.4.2 Batch quality: Calculated by the number of unqualified products per 100 units of products. Unqualified classification
6.4.3 Inspection item day, discrimination level (DL), non-conforming classification, non-conforming quality level (RQL), sample size (n), and judgment array are shown in Table 2.
6.4.4 Inspection cycle: one month.
Inspection items
Paint film hardness
Paint film impact resistance
Paint film corrosion resistance
Zinc coating thickness
Chromium-plated parts corrosion resistance
Articles of this standard
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
The following markings should be on the outside of the product packaging box:
a. b. Name of manufacturer;
c. Name of product;
d. Product model or mark:
N. Sample size of unqualified
n, = 5
n, = 5
e. Standard code, number, name (can also be marked on the product or instruction):
2B/T1721--93
f. Box size (length × width × height) and volume: 9. Quantity;
h. Net weight and gross weight;
“Handle with care”, “Afraid of moisture”
i. Date of export or production batch number.
7.2 Packaging
7.2.1 Products are packed individually in paper bags and neatly packed in cartons or without boxes. 7.2.2 The box should be accompanied by a product certificate.
7.3 Transportation
The packaging box containing the product should be placed flat, and should be handled with care, not thrown, and should not be moved or touched during transportation. It is strictly forbidden to mix and transport with corrosive items such as acids and alkalis. 7.4 Storage
The product should be stored in a room with low coal, ventilation, and protection from rain and snow. It should not be stored together with active chemicals or dust-generating items. The box should be firmly raised, no more than 100mm above the ground. 7.5 From the date of export, the product should not rust within 9 months under normal transportation and storage conditions. Additional remarks:
This standard is proposed by the Quality Standards Promotion Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Bicycle Standardization Center. This standard is drafted by Guangzhou Bicycle Chain Cover Factory, Shenzu Bicycle Parts Factory No. 3, Nantong Bicycle Chain Cover Factory, Taiwan Bicycle Parts General Factory, and Bobai Bicycle Parts Factory. The main drafters of this standard: Chen Cheng and Chen Hongfeng. 92 -
People's Republic of China
Industry Standard
Bicycle Industry Standard
Light Industry Standardization Editorial and Publishing Committee
Address: No. 12, Guanghua Road, Chaowai, Beijing
Tel: 5060032~2309
Postal Code: 100020
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