Some standard content:
1 Subject content and scope of application
Industry Standard of the People's Republic of China
Bicycle
Clipper brake
QB/T1719-93
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle caliper brakes (hereinafter referred to as "caliper brakes"). This standard applies to caliper brakes for lightweight and sports bicycles as specified in QB1714 "Bicycle Naming and Model Compilation Method".
Cited standards
GB2828
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches)GB2829
CB3565
GB3566
GB12742
Counting sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability)Safety requirements for bicycles
Bicycle assembly requirements
Technical conditions for bicycle testing equipment and instrumentsQB/T1217
QB/T1218
3 Product classification
Technical conditions for bicycle electroplating
Technical conditions for bicycle painting
3.1 Basic types and parts names
Side-pull pliers brake See Figure 1 and Figure 2 for examples. 1-rope loop;
2-positioning sleeve,
3-rope,
4-rope upper joint,
5-front brake handle (right brake handle) bracket
6-rear brake handle (left brake handle) bracket:
7-front brake handle (right brake handle)
8-rear brake handle (left brake handle) 3
9-bracket clamp ring
Ministry of Light Industry of the People's Republic of China 1993-04 —15 Approved 48
1993—12—01 Implementation
1—Pad;
6—Left gate fork;
11—Gate leather box;
2—Gate fork ring:
7—Bracket screw;
12—Flat head screw;
QB/T1719-93
3—Through screw;
8-Tight rope screw;
3.1.2 Center-pull type clamp gate. See Figures 3 and 4 for examples. 12
4-right brake fork#
9-safety helmet,
121110
5-adjusting screw:
10-brake skin,
1-front brake handle (right brake handle);
2-rear brake handle (left brake handle)
3-joint on the steel rope
4-joint sleeve,
5-auxiliary brake handle,
6-front brake handle (right brake handle) bracket;
7-rear brake handle (left brake handle) bracket;
8-brake handle bracket sleeve;
9-positioning sleeve
10-steel rope sleeve||t t||11-Steel rope:
12-Bracket clamp ring
1-Adjusting screw:
6-Gate fork fixing frame ring;
11-Flat head screw,
16-Gate fork steel rope joint,
2-Bracket screw,
7-Through screw;
12-Gate skin,
17-Gate fork steel rope:
QB/T1719--93
3-Tightening rope screw;
8-Wenyou fixing frame;
13-Gate skin box;
18-Safety helmet
3.1.3 Cantilever clamp gate. See Figure 5 and Figure 6 for examples. 1
1-Steel rope:
5-Rear brake handle (left brake handle) bracket;
2-Steel rope sleeve,
6-Steel rope upper joint;
4-Tightening rope washer;
9-Left brake spring,
14-Right fork;
3Adjusting nut;
Front brake handle (right brake handle),
5-Pull plate;
10-Right brake spring;
15-Left brake fork,
4-front brake handle (right brake handle) bracket,
8-rear brake handle (left brake handle)
1-tightening rope screw
6-brake leather rod
11-right brake arm,
16-four pieces,
3.2 type and size
2-tightening rope washer;
7-brake arm steel rope joint;
12-left brake spring,
17-positioning rod,
For the type and size of the brake handle, see Figure 7 and Table 1.
QB/T1719--93
3-pull plate;
8-safety helmet
13-right smell spring,
18-adjusting screw
4-brake shoe,
9-brake arm steel rope,
14-shaft sleeve,
5-brake shoe box:
10-left brake arm;
15-convex piece,
QB/T1719-93
3.2.2 The dimensions of side-pull and center-pull pliers brakes are shown in Figure 8, Figure 9 and Table 2. Figure
≤100
3.2.3 Cantilever clamp gate type dimensions
QB/T1719—93
3.2.3.1 The center distance between the left and right gate arm positioning holes is shown in Figure 10.22
3.2.3.2 The shaft sleeve dimensions are shown in Figure 11.
3.3 Product code
QB/T 1719-93
The product code consists of the type code, specification code and factory design serial number. 口
The type code is shown in Table 3.
3.3.2 Specification code
Factory design serial number
Specification code
Type code
Side-pull caliper brake
Middle-pull caliper brake
Cantilever caliper brake
Specification code is expressed by the H dimension of side-pull and middle-pull caliper brakes. Cantilever caliper brakes do not need to be marked with specification code. 3.3.3 Example
4 Technical requirements
4.1 Braking system sensitivity
Factory design serial number
Specification dimension H
Side-pull caliper brake
Apply a brake force of 44.5N on the front and rear brake handles of the vehicle respectively, and the brake shoes can touch the rim. After removing this force, the brake shoes can quickly return to their original position.
4.2 Braking system strength
Should comply with the provisions of Article 5.4.1 of GB3565. 4.3 Braking performance
Should comply with the provisions of Article 5.5 of GB3565.
4.4 Combined strength of brake shoe and brake shoe box
When a static load of 294N in the longitudinal direction and 147N in the transverse direction is applied to the brake shoe, the brake shoe shall not fall off or crack from the brake shoe box. 4.5 Breaking force of steel rope and steel rope joint
QB/T1719--93
The combination of steel rope and steel rope joint shall be firm, and its minimum breaking force is 1500N. 4.6 Fatigue strength of steel rope and steel rope upper joint
After 10,000 fatigue tests, the joint of steel rope and steel rope upper joint assembly shall not fall off and each strand of steel rope shall not break. 4.7 Plating quality
Chrome-plated parts: front and rear brake handles are Class I parts, left and right brake forks, left and right brake arms are Class II parts, and the rest are Class III parts. All galvanized parts are Class II parts.
4.7.1 The appearance of electroplated parts shall comply with the provisions of Article 5.1.1 of QB/T1217. 4.7.2 The surface roughness of plated parts shall comply with the provisions of Article 5.2 of QB/T1217. : 4.7.3 The corrosion resistance of chrome-plated parts shall comply with the provisions of Article 5.4.1 of QB/T-1217. 4.8 Paint quality
4.8.1 The appearance of the paint film shall comply with the provisions of Article 4.1.1 of QB/T1218 for Class III parts. 4.8.2 The corrosion resistance of the paint film shall comply with the provisions of Article 4.3 of QB/T1218 for Class III parts. 4.9 Sleeve size
The sleeve length is 16H11 (-.11), and the inner hole size is 811 (+). 5 Test method
5.1 The finished vehicle used in the test of this chapter shall comply with the provisions of GB3566. The testing equipment and instruments used shall comply with the provisions of GB12742.
5.1 Braking system sensitivity performance test
This test shall be carried out on the finished vehicle. After the caliper brake is adjusted to the effective operating position, a 44.5N brake force is applied vertically at 25mm from the end of the brake handle and then observed and inspected. Repeat 5 times. 5.2 Braking system strength test
According to the provisions of Article 21.1 of CB3565.
5.3 Braking performance test
According to the provisions of Chapter 22 of GB3565.
5.4 Brake skin and brake box combined strength test
5.4.1 Install the brake skin and the brake box assembly on the special fixture 1 (the three-sided sealed brake box opening is facing downward), and apply a longitudinal static load at 1/2 of the thickness of the brake skin, as shown in Figure 12. Then install the brake skin and the brake box assembly on the fixture II, and apply a transverse static load at 1/2 of the thickness of the brake skin, as shown in Figure 13. The full load time each time does not exceed 5s. 5.4.2 The main dimensions of the fixture I, the pressure head I, the fixture II, and the pressure head II are shown in Figures 12 and 13. 5.5 Breaking force test of steel rope and steel rope joint
As shown in Figure 14, fix the steel rope and steel rope joint assembly on the special fixture and test it on the tensile testing machine. The tensile speed is not more than 20mm/min.
5.6 Fatigue strength test of steel rope and steel rope joint As shown in Figure 15, install the steel rope and steel rope joint assembly on the fatigue testing machine, hang a weight of 15kg, and test at 25mm from the end of the gate handle, with a stroke of 25mm and 60 times/min. During the test, it is allowed to apply lubricant on the junction of the gate handle and the steel rope and on the steel rope. 55-
Center of the leather
Clamp
Center of the leather
QB/T 1719—93
Pressure head
Clamp II
Force application point
5.7 Electroplating quality test
QB/T1719—93
5.7.1 The appearance of electroplated parts shall comply with the provisions of Article 5.1.2 of QB/T1217. 5.7.2 Surface roughness of chrome-plated parts
Test parts: front and rear brake handles, left and right brake forks, left and right brake arms. Test location: front view of parts.
Test method shall comply with the provisions of Article 5.2.2 of QB/T1217. 5.7.3 Anti-corrosion ability of chrome-plated parts
QB/T1719--93
Test parts: front and rear brake handles, left and right brake forks, left and right brake arms. Test location: front view of parts.
Test method shall comply with the provisions of Article 5.4.2 and Appendix C of QB/T1217. 5.8 Paint quality test
5.8.1 Appearance of paint film shall comply with the provisions of Article 5.1 of QB/T1218. 5.8.2 Anti-corrosion ability of paint film
Test parts: left and right brake forks, left and right brake arms. Test location: front view of the part.
Test method is in accordance with Article 5.3 of QB/T1218. 5.9 Sleeve size measurement
The length of the sleeve is measured with a caliper. The inner hole size is measured with a plug gauge. 6 Inspection rules
6.1 Products must be inspected and qualified by the inspection department of the manufacturer and accompanied by a certificate of conformity before they can leave the factory. 6.2 Unit product: pair.
6.3 Factory inspection: GB2828 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 items, inspection level (IL), unqualified classification, and qualified quality level (AQL) are shown in Table 4. Table 4
Inspection items
Appearance quality of electroplated parts
Surface roughness of chrome-plated parts
Appearance of paint film
Shaft sleeve size
Clause of this standard
6.4 Type inspection: GB2829 is adopted.
6.4.1 Inspection cycle: one month, of which the braking performance is one year. 6.4.2 Sampling plan: two-time sampling plan. Unqualified classification
6.4.3 Batch quality: calculated by the number of unqualified products per hundred units of products. 6.4.4 Inspection items, discrimination level (DL), unqualified classification, unqualified quality level (RQL), sample size (n), and judgment array are shown in Table 5.
Inspection items
Sensitive performance of brake system
Strength of brake system
Braking performance
Combined strength of brake shoe and brake shoe box
Tear-off force of steel rope and steel rope joint
Steel rope and steel rope upper joint
Fatigue strength
Corrosion resistance of chrome-plated parts
Abrasion resistance of paint film
Articles of this standard
Marking, packaging, transportation, storage
7.1 Marking
The following markings should be on the outside of the product packaging box:
a. Manufacturer name,
b. Product name,
c. Trademark,
d. Product code,
QB/T1719—93
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, afraid of moisture mark;
i. Date of manufacture or production batch number.
7.2 Packaging
7.2.1 Products shipped shall be accompanied by product certificates. Sample size
Judgment array
A =1 R,=3
7.2.2 Each product shall be packaged in a single small package, with a carton or other box for packaging, and then tied firmly with strapping tape or other methods. Special circumstances can be determined according to user requirements. 7.3 Transportation
The packaging box containing the product shall be laid flat, and shall be handled and placed gently during transportation, and shall not be thrown or tied. It shall not be exposed to the sun or rain during transportation.4 Inspection items, discrimination level (DL), nonconforming classification, nonconforming quality level (RQL), sample size (n), and judgment array are shown in Table 5.
Inspection items
Braking system sensitivity
Braking system strength
Braking performance
Combined strength of brake pad and brake pad box
Tear force between steel rope and steel rope joint
Steel rope and steel rope upper joint
Fatigue strength
Corrosion resistance of chrome-plated parts
Abrasion resistance of paint film
Articles of this standard
Marking, packaging, transportation, storage
7.1 Marking
The following markings should be placed on the outside of the product packaging box:
a. Manufacturer name,
b. Product name,
c. Trademark,
d. Product code,
QB/T1719-93
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;
i. Factory date or production batch number.
7.2 Packaging
7.2.1 The factory products should be accompanied by product certificates. Sample size
Judgment array
A =1 R,=3
7.2.2 Each product should be packed in a single small package, with a carton or other box packaging, and then tied firmly with strapping tape or other methods. Special cases can be determined according to user requirements. 7.3 Transportation
The packaging box containing the product should be placed flat and should be handled and placed gently during transportation. It should not be thrown or tied. It should not be exposed to the sun or rain during transportation.4 Inspection items, discrimination level (DL), nonconforming classification, nonconforming quality level (RQL), sample size (n), and judgment array are shown in Table 5.
Inspection items
Braking system sensitivity
Braking system strength
Braking performance
Combined strength of brake pad and brake pad box
Tear force between steel rope and steel rope joint
Steel rope and steel rope upper joint
Fatigue strength
Corrosion resistance of chrome-plated partsbzxZ.net
Abrasion resistance of paint film
Articles of this standard
Marking, packaging, transportation, storage
7.1 Marking
The following markings should be placed on the outside of the product packaging box:
a. Manufacturer name,
b. Product name,
c. Trademark,
d. Product code,
QB/T1719-93
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;
i. Factory date or production batch number.
7.2 Packaging
7.2.1 The factory products should be accompanied by product certificates. Sample size
Judgment array
A =1 R,=3
7.2.2 Each product should be packed in a single small package, with a carton or other box packaging, and then tied firmly with strapping tape or other methods. Special cases can be determined according to user requirements. 7.3 Transportation
The packaging box containing the product should be placed flat and should be handled and placed gently during transportation. It should not be thrown or tied. It should not be exposed to the sun or rain during transportation.
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