Some standard content:
Industry Standard of the People's Republic of China
Bicycle Industry Standard
1993-04-—15
1993-07-29
199312—01,
1994-03--01
Issued by the Ministry of Light Industry of the People's Republic of China
QB1714-93
Household Bicycle
QB/T 1715—93
QB/T 1716—93
QB/T1717--93
QB/T 1718—93
QB/T1719—93
QB/T 1720-93
QB/T1721--93
QB/T 1722--93
QB/T 1723--93
QB1724—93
QB1802-—93
Method for naming and model compilation·
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
Bicycle
White-travel vehicle
White-travel vehicle
Bicycle
Ordinary front and rear brakes·
Caliper expansion brake
Insurance document
Wheel series·
（30）
-( 61)
-( 93 )
( 99 )
（1042
Subject content and scope of application
Industry Standard of the People's Republic of China
Bicycle
QB/T 1716--93
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle chains (hereinafter referred to as "chains"). The standard is applicable to bicycle chains specified in QB1714 "Bicycle Naming and Model Compilation Method". 2 Reference standards
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB2829 Periodic inspection counting sampling procedures and sampling tables (applicable to the inspection of the stability of the production process) GB1274 2 Technical conditions for bicycle testing equipment and instruments GE230 Metal Rockwell hardness test force method
3 Product classification
3.1. Basic type and part name. For example, see Figure 11--pin shaft, 2-outer plate: 3-inner plate; 4-circle: 5-concentrated; 6-plate, 7-connecting shaft: 8-connecting plate
3.2 Type dimensions see Table 1
Approved by the Ministry of Light Industry of the People's Republic of China on 1993-04-15 1
Implemented on 1993-12-01
Chain code
1/2 ×1/8
1/2×3/32
5/8 × 8/16
3.3 Marking example
VII Name
Bicycle chain 1/2 ×1/8
4 Technical requirements
4.1 Dimensions
4.1.1 The inner diameter of the chain link
QB/T 1716—93
QB/T1716—93
The inner diameter of the 1/2×1/8 chain shall not be less than 3.4mm, the inner diameter of the 1/2×3/92 chain shall not be less than 2.4mm, and the inner diameter of the 5/8×3/16 chain shall not be less than 4.6mm.
4.1.2 Total length
The total length of a 100-link chain (5/8×3/16 chain is 80 links) is 1270=mm. For the calculation method of the total length of chains with other links, see Appendix B (reference). 4.1.3 The pin length of a 1/2x3/32 chain shall not be greater than 8.2mm, 4.2 Breaking forcebzxz.net
The breaking force shall not be less than F800N
4.3 Flexibility
It should be flexible when passing on special tools without getting stuck (excluding joints). 4.4 Curvature
The curvature of a 100-link chain shall be in accordance with Table 2.
1/2 ×1/8
1/2×3/82
5/8×3/16
Degree (H)
255 (for speed change below three-speed)
For the calculation method of the bending degree of chains with other number of links, see Appendix C (reference part). 4.5 Parts hardness
Parts hardness shall be in accordance with Table 8.
4.6 Appearance quality
Q8/T 1716-93
Height (HRA)
The chain shall not have missing parts, and the required parts shall not have missing pieces. The surface shall not have bruises, cracks and rust. Test method
The testing equipment and instruments used in the test shall comply with the provisions of GB12712. 5.1 Dimension test
5.1.1 Inner width of inner chain link
Inspect with a special plug gauge: The plug gauge should be able to pass through. The dimensions of the special plug gauge are shown in Appendix A (Supplement). 5.1.2 Total length
Fix one end of the chain on the chain length measuring instrument, apply force 9 to the other end, and measure its total length (see Figure 2). 98N
5.1.31/2×3/32 Chain pin rail length
Measure with 0-25mm outside diameter micrometer.
5.2 Breaking force test
Take a length of 2 on the chain (13 sections for inner chain and 2 sections for outer chain), clamp it with a clamp, and install three sections at both ends in the central fixture when assembling, and test it on the tensile machine. If the breaking point occurs at the clamping position, the test is invalid, see Figure:
5.3 Flexibility test
QB/T 1716—93
Put the chain on a special tool and pull it by hand, and the whole chain should be able to pass (see Figure 4). Figure
5.4 Bending test
Fold the chain in half and place it on a flat plate. Use a steel ruler to measure the distance from the end of the flat plate to the outer plate as shown in Figure 5. Figure
5.5 Parts hardness test
The integrally formed parts are placed on the sample table with V-grooves, and the rolled parts are broken into four pieces. The inner surface of the blocks is scanned. The test method is in accordance with the requirements of GH230.
5.6 Chain appearance quality inspection
The appearance quality is checked by visual inspection according to Figure 6.
6 Inspection rules
6, 1 The product must be inspected and qualified by the production and inspection department, and a certificate of conformity is attached. The minimum unit product can be produced: 6.2 pieces.
6.3 Factory inspection
GB 2828 is adopted.
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 day, inspection level (11.), unqualified classification, individual quality level (AQL) are listed in Table 4. 24
Inspection items
Appearance quality
6.4 Type inspection
Adopt GB2829,
QB/T 1716--93
This standard promotes the provisions
6.4.1 Sampling plan: Secondary sampling plan. 4
6.4.2 Batch quality: Calculated by the number of unqualified products per unit product. Unqualified classification
6.4.3 Inspection items, deletion level (DL), unqualified classification, unqualified quality limit (RQL), sample size (), judgment array are shown in the table.
6.4.4 Inspection cycle: month.
Inspection items
Chain breaking force
Chain size
Parts hardness
Text of this standard
7 Marking, packaging, transportation, storage
7.1 Marking
The following markings should be marked on the outside of the product packaging box:
a. Manufacturer name;
b. Product name,
F. Trademark;
d. Product code:
Unqualified classification
e. Standard code, number, name (can also be marked on the product or manual): f. Box size (length × width × height) and volume, 9. Quantity:
h. Net weight and gross weight#
1. Handle with care, moisture-proof mark
. Date of publication or small batch.
7.2 Packaging
Sample size;
n, - 5
nz = 5
n, = 5
Judgment array
A,=4 1
7.2.1Products leaving the factory should be accompanied by a product qualification certificate. QB/T1716—93
7.2.2Each product should be packed in a single small package, with a carton or other box packaging: then tied firmly with strapping tape or other methods. Special circumstances can be determined according to the product requirements. 7.3 Transportation
The packaging box containing the product should be flat, and should be handled with care, not spread or thrown. It should not be exposed to the sun or rain during transportation. It is strictly forbidden to mix it with corrosive substances such as acids and alkalis for transportation. .4 Storage
7.4.1 The product should be placed in a dry, ventilated place that can prevent snow and snow. It should not be placed together with active chemicals or dust-generating materials. The cartons should be at least 10 meters above the ground. 7.4.2 From the date of shipment, the product should not rust within nine months under normal transportation and storage conditions. 8
A1 Plug gauge type
The plug gauge type is shown in Figure 1.
A2 Plug gauge size
The basic size of the plug gauge is shown in Table A1.
Wire code
QB/T 1716-93
Appendix A
Special plug gauge for inner width of inner link
(Supplement)
QiuＡ1
Basic size
1/2×1/8
1/2×3/32
5/8×3/16
Limit end size
Appendix B
Calculation method for total length of chain
(Examination)
11/2×1/8, 1/2×3/32 Calculation method for total length of chain B1.1 Calculation formula for basic size
Li = PX n ++i+++++++++*.
Knapsack: lt-pad size, mm
P-.Pitch, mm,
Number of sections.
Limit deviation
+++++++++++++++++++* (B 1)
27 —
B1.2 Determination of limit deviation
QB/T 1716—93
The upper deviation is positive: n×0.03mm/section; the lower deviation is negative: n x0.01mm/. B1.3 Total length calculation formula
+(nx0,03)
L=p×n
(ux0,01)
Where L is the total length of the chain, m.
B25/8×3/16 Chain total length calculation method B2.1 Basic size calculation formula is the same as (B1) Wu, B2.2 Determination of limit deviation
The upper deviation is positive, n×0.0375mm/section, and the lower deviation is negative: n×0.0125mm/section. B2.3 Total length calculation formula
+(nx0,0375)
L=P×n
(m×0.0125)
Where, L—total length of chain, mm.
Appendix C
Calculation method of chain curvature
(reference)
C11/2×1/8 Calculation method of chain curvature
C1.1 Determination of radius of curvature H
C1.1:1 Jianwen formula
L-+VB+4H-
R=B+4H
Wu Zhong L-chain double-bend arc length, Ⅱm!
B—chord length, m
H--equal degree, mm;
R radius of curvature, mmu
C1.1.2 Calculate R
(B each)
According to the current national standard, the curvature of 100-section chain shall not exceed F: 70mm. Substitute the length of 100 sections (1=622.3mm): variable curvature (H≤70mm) for (C1), [C2) and obtain H curvature radius R=679.66mm. No matter how the number of sections changes, the curvature radius R is a constant. C1.2 Calculation formula for curvature H
H=R(1 - tou 90 ×l
QB/T 1716-93
Substitute the length 1 of the chain with any number of links and the constant R into formula (C3), and H is the curvature of any number of links. For example: Calculation of curvature of a 114-link chain: Substitute the length of the 114-link double-fold bottle (1=711.2mm): curvature diameter (R=679.66mm) into formula (9), and we get H =9lmm
C21/2×3/32 Calculation method for chain curvature C2.1 Curvature radius H Indeed, according to the chain technical standard of Meiwei Qiafei Company, the curvature radius of the chain is R≤711.2mm. No matter how the number of sections changes, the curvature radius R is a constant. C2.2 Curvature H calculation formula
Curvature H calculation formula (C8).
C35/8×3/16 chain curvature calculation method C3.1 Curvature flat radius R Determination of
According to the current international standard 96 chain (1=746, 25mm), H70 is substituted for (C1), (C2), and R=982.3mm is obtained.
Because no matter how the number of sections changes, the curvature is an integer. C3.2 Calculation formula for variable curvature H
The calculation formula for curvature H is the same as (C)
Addition of explanation:
This standard is proposed by the Department of Quality and Standards of the Ministry of Light Industry. This standard was developed by the National Bicycle Standardization Center, and this standard was promoted by Shanghai Nanxing Bicycle Chain Factory, Dajian Bicycle Chain Factory, Qingdao Bicycle Industry Company Chain Factory, Changzhou Bicycle Chain Factory, Shunde Chain! Drafted with capital. Who are the main drafters of this standard: Yue Jian, Zhu Du, Sui Fang 29
People's Republic of China
Industry Standards
Bicycle Industry Standards
Light Industry Standardization Editorial and Publishing Committee
Address: No. 12, Guanghua Road, Chaowai, Beijing
Telephone: 5060032~2309
Postal Code: 100020
Internal Information
No Reprinting Allowed
Price: 25,000 yuan
Print Quantity: 3000 copies2 Calculate R
(B)
According to the current national standard, the curvature of a 100-link chain shall not exceed F: 70mm. Substitute the length of 100 links (1=622.3mm) and the curvature (H≤70mm) into (C1) and [C2) to obtain the curvature radius R=679.66mm. No matter how the number of links changes, the curvature radius R is a constant. C1.2 Calculation formula for curvature H
H=R(1 - tou 90 ×l
QB/T 1716-93
Substitute the length 1 of the chain with any number of links and the constant R into formula (C3), and H is the curvature of any number of links. For example: Calculation of curvature of a 114-link chain: Substitute the length of the 114-link double-fold bottle (1=711.2mm): curvature diameter (R=679.66mm) into formula (9), and we get H =9lmm
C21/2×3/32 Calculation method for chain curvature C2.1 Curvature radius H Indeed, according to the chain technical standard of Meiwei Qiafei Company, the curvature radius of the chain is R≤711.2mm. No matter how the number of sections changes, the curvature radius R is a constant. C2.2 Curvature H calculation formula
Curvature H calculation formula (C8).
C35/8×3/16 chain curvature calculation method C3.1 Curvature flat radius R Determination of
According to the current international standard 96 chain (1=746, 25mm), H70 is substituted for (C1), (C2), and R=982.3mm is obtained.
Because no matter how the number of sections changes, the curvature is an integer. C3.2 Calculation formula for variable curvature H
The calculation formula for curvature H is the same as (C)
Addition of explanation:
This standard is proposed by the Department of Quality and Standards of the Ministry of Light Industry. This standard was developed by the National Bicycle Standardization Center, and this standard was promoted by Shanghai Nanxing Bicycle Chain Factory, Dajian Bicycle Chain Factory, Qingdao Bicycle Industry Company Chain Factory, Changzhou Bicycle Chain Factory, Shunde Chain! Drafted with capital. Who are the main drafters of this standard: Yue Jian, Zhu Du, Sui Fang 29
People's Republic of China
Industry Standards
Bicycle Industry Standards
Light Industry Standardization Editorial and Publishing Committee
Address: No. 12, Guanghua Road, Chaowai, Beijing
Telephone: 5060032~2309
Postal Code: 100020
Internal Information
No Reprinting Allowed
Price: 25,000 yuan
Print Quantity: 3000 copies2 Calculate R
(B)
According to the current national standard, the curvature of a 100-link chain shall not exceed F: 70mm. Substitute the length of 100 links (1=622.3mm) and the curvature (H≤70mm) into (C1) and [C2) to obtain the curvature radius R=679.66mm. No matter how the number of links changes, the curvature radius R is a constant. C1.2 Calculation formula for curvature H
H=R(1 - tou 90 ×l
QB/T 1716-93
Substitute the length 1 of the chain with any number of links and the constant R into formula (C3), and H is the curvature of any number of links. For example: Calculation of curvature of a 114-link chain: Substitute the length of the 114-link double-fold bottle (1=711.2mm): curvature diameter (R=679.66mm) into formula (9), and we get H =9lmm
C21/2×3/32 Calculation method for chain curvature C2.1 Curvature radius H Indeed, according to the chain technical standard of Meiwei Qiafei Company, the curvature radius of the chain is R≤711.2mm. No matter how the number of sections changes, the curvature radius R is a constant. C2.2 Curvature H calculation formula
Curvature H calculation formula (C8).
C35/8×3/16 chain curvature calculation method C3.1 Curvature flat radius R Determination of
According to the current international standard 96 chain (1=746, 25mm), H70 is substituted for (C1), (C2), and R=982.3mm is obtained.
Because no matter how the number of sections changes, the curvature is an integer. C3.2 Calculation formula for variable curvature H
The calculation formula for curvature H is the same as (C)
Addition of explanation:
This standard is proposed by the Department of Quality and Standards of the Ministry of Light Industry. This standard was developed by the National Bicycle Standardization Center, and this standard was promoted by Shanghai Nanxing Bicycle Chain Factory, Dajian Bicycle Chain Factory, Qingdao Bicycle Industry Company Chain Factory, Changzhou Bicycle Chain Factory, Shunde Chain! Drafted with capital. Who are the main drafters of this standard: Yue Jian, Zhu Du, Sui Fang 29
People's Republic of China
Industry Standards
Bicycle Industry Standards
Light Industry Standardization Editorial and Publishing Committee
Address: No. 12, Guanghua Road, Chaowai, Beijing
Telephone: 5060032~2309
Postal Code: 100020
Internal Information
No Reprinting Allowed
Price: 25,000 yuan
Print Quantity: 3000 copies
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