JB/T 50022-2000 Agricultural Machinery Leaf Spring Product Quality Classification JB/T50022-2000 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T50022-2000
Agricultural Machinery Leaf Spring
Product Quality Grading
(Internal Use)
2000-03-30 Issued
National Machinery Industry Bureau
2000-10-01 Implementation
JB/T50022-2000
This standard is a revision of JB/T50022-94 "Agricultural Machinery Leaf Spring Product Quality Grading". Compared with JB/T50022-94, the main technical content of this standard has been changed as follows: Adjusted and corrected the range and expression of stress amplitude values ​​in Table 1: Deleted some C-type items;
- Adjusted some contents of the inspection methods and inspection rules; - Adjusted the sampling validity period of product samples; - Adjusted the qualified quality level, qualified judgment number and unqualified judgment number of C-type items. Appendix A of this standard is the appendix of the standard.
This standard replaces JB/T50022-94 from the date of implementation. This standard is proposed and managed by the National Agricultural Machinery Standardization Technical Committee. The responsible drafting units of this standard are: China Agricultural Mechanization Science Research Institute, Anqing Automobile Leaf Spring Factory. The participating drafting units of this standard are: Jilin University of Technology, Yangzhou Automobile Spring Factory, Jining Spring Factory. The main drafters of this standard are: Zheng Qingshan, Li Zhiqing, Fang Shusheng. 1 Scope
Machinery Industry Standard of the People's Republic of China
Agricultural Machinery Leaf Spring
Product Quality Classification
(Internal Use)
JB/T50022-2000
Replaces JB/T50022-94
This standard specifies the quality indicators, test methods and inspection rules of agricultural machinery leaf springs (hereinafter referred to as leaf springs). This standard applies to the quality classification of leaf spring products for agricultural machinery such as agricultural trailers and agricultural transport vehicles. Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards GB/T2828-1987 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) JB/T7283-1994
3 Quality indicators
Agricultural machinery leaf springs: technical conditions
Leaf springs should be manufactured according to drawings and technical documents approved by the prescribed procedures and comply with the provisions of JB/T7283. Leaf springs are divided into qualified products and first-class products according to their technical level and quality level. Product quality classification indicators should comply with the provisions of Table 1. Table 1 Quality index classification table
284.4-323.5
>323.5~362.9
Static arc height or
Arc height deviation
Stiffness or
Stiffness deviation
Bushing bore tolerance
Free arc height deviation
715.9~832.0
>8 32.0~902.0
Main engine load<49000N
Main engine load≥49000N
Stiffness<93.2N/mm
Stiffness≥93.2N/mm
Metal bushing
Non-metal bushing
Approved by the State Machinery Industry Bureau on 2000-03-30mm
Quality grading index
Compliant Quality
1000×102
600×102
400×102
300×102
1200×102
800×102
600×102
400×102
According to JB/T7283
Free arc height ±10% (maximum value) Not more than 10mm) 2000-10-01 implementation
Lip parallelism
Lip verticality
Assembly width deviation
Lip width deviation
Gap between sheets
Sheet thickness ≤ 8
Sheet thickness > 8~12
Sheet thickness > 12
Surface quality
1 Gap between sheets does not apply to springs with gaskets between sheets. 2 The stresses involved in this standard refer to average stresses. 4 Inspection methods
4.1 Basic requirements
JB/T50022-2000
Table 1 (end)
Quality grading index
Qualified products
≤2.0/200
≤2.0/200
Should not have defects such as overburning, cracks, flash, etc. that are harmful to use. 4.1.1 From the time the sample is taken and sealed to the end of the inspection work, it is not allowed to change the sample or replace the parts except for maintenance and repair in accordance with relevant regulations. 4.1.2 During the product inspection and testing process, the accuracy and reliability of each test data must be guaranteed. If abnormal data is found, the cause should be found out in time and necessary processing should be made.
4.1.3 The accuracy of various equipment, instruments and meters used for testing should meet the requirements of measurement accuracy. Before inspection and testing, the test equipment and instruments should be checked and calibrated.
4.2 Performance Item Determination
4.2.1 The performance items of leaf springs shall be tested on a special spring testing machine or a corresponding material testing machine. 4.2.2 The method for determining the permanent deformation of leaf springs shall comply with the provisions of JB/T7283. 4.2.3 The method for determining the static arc height or arc height under a specified load, deflection or deflection under a specified load of leaf springs shall comply with the provisions of JB/T7283. 4.2.4 The method for determining the stiffness of leaf springs shall comply with the provisions of JB/T7283. For leaf spring assemblies with nonlinear characteristics, the load and deformation shall be determined by drawing the leaf spring characteristic curve when necessary, and calculated according to formula (3) in JB/T7283-1994. 4.3 Bench Fatigue Life Determination
4.3.1 It shall be carried out on a special fatigue testing machine for leaf springs. 4.3.2 The test method shall comply with the provisions of JB/T7283. 4.3.3 The clamping conditions for leaf spring testing of major domestic agricultural machinery models are shown in Appendix A (Appendix to the standard) 5 Inspection rules
5.1 Sampling method
5.1.1 Sampling inspection procedure According to the normal sampling plan of GB/T2828, the general inspection level I is adopted. 5.1.2 Random sampling is conducted among the products produced by the factory within the past year. When sampling, the sampling parent quantity should be no less than 50 frames. This limit does not apply when sampling at the distribution department or user. The samples taken should be qualified products of the corresponding grade. 2
2 Classification of non-conforming items
JB/T50022-2000
5.2.1 Any item that does not meet the requirements specified in Chapter 3 is called a non-conforming item. 5.2.2
Non-conforming items are divided into Class A non-conforming items, Class B non-conforming items and Class C non-conforming items according to their impact on product quality. See Table 2 for the classification of non-conforming items. bzxZ.net
2 Classification table of non-conforming items
Non-conforming classification
Judgment rules
Fatigue life of bench
Permanent deformation
Name of non-conforming item
Static arc height or arc height under specified load
Stiffness or stiffness under specified load
Bushing aperture
Free arc height
Verticality of rolled ears
Parallelism of rolled ears
Assembly width
Wide of rolled ears
Gap between sheets
Surface, appearance
5.3.1 Products are sampled and judged according to the requirements of the sampling judgment plan table (see Table 3). The qualified quality level AQL, qualified judgment number Ac, and unqualified judgment number Re in Table 3 are calculated by the point method (i.e. the number of unqualified items). 5.3.2. Adopt the item-by-item assessment method. When the number of unqualified items in each category in the sample is less than or equal to the qualified determination number Ac, the category is judged as passed. At the same time, the decision on whether each category passes or fails should be made according to the sampling inspection plan. The grade that passes all three categories A, B, and C is determined as the product grade.
Table 3 Sampling judgment plan
Unqualified classification
Sample size
Sampling plan
Qualified products
First-class products
Inspection level
Sample code
Number of category A items
Number of category B items
General inspection level I
Number of category C items
JB/T50022-2000
Appendix A
(Appendix to the standard)
Clamping conditions for leaf spring test of major domestic agricultural machinery models A1 The upper and lower clamps are made according to Figure A1, and their dimensions are shown in Table A1. 20
Agricultural trailer||tt| |Four-wheeled agricultural transport vehicle
7C1~7CC3
7CC4-7CC7
Rear, auxiliary
Three-wheeled agricultural transport vehicle
Upper clamping plate
A2 Clamping bolts and clamping torque are shown in Table A2.4
Lower pad
Upper clamping plate
Lower pad
Upper clamping plate
Lower pad
Agricultural trailer
Four-wheeled agricultural transport vehicle
7C1.5, 7CC2
JB/T50022—2000
Clamping bolts
7CB2, 7CC3, 7CC4
7CB3, 7CC5~7CC7
Rated load
Three-wheeled agricultural transport vehicle
1000kg
1500kg
Clamping bolt center distance
Clamping torque
98.0~127.4
166.6~186.2
245.0~294.0
98.0-127.4
127.4~147.0
68.6~98.0
People's Republic of China
Machinery industry standard
Agricultural machinery steel plate spring
Quality score Etc.
(For internal use)
JB/T50022-2000
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Format 880X1230
Postal code 100044)
Sheet 1/2
Word count 12.000
First edition in August 2000
First printing in August 2000
Print run 1-500
Price 10.00 yuan
2000-088
Mechanical Industry Standards Service Network: 0020
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