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Mechanical Industry Standard of the People's Republic of China
JB/T51225-1999
Product Quality Grading of Chain Feeders for Chickens
(For Internal Use)
Published on 1999-12-30
National Bureau of Machinery Industry
Implemented on 2000-06-01
JB/T51225—1999
This standard is a revision of JB/T51225.1~51225.394 "Product Quality Grading of Chain Feeders for Chickens". Compared with JB/T51225.1~51225.3—94, the main technical contents of this standard have been changed as follows: Reliability has been changed to average working time before the first failure, and indicators have been specified for ordinary chains, fast chains and high-speed chains respectively: one, load power and working chain speed have been added; one, the classification of non-conforming products has been adjusted.
This standard replaces JB/T51225.1~51225.3-94 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Technical Committee for Agricultural Machinery Standardization. The main drafting units of this standard are: China Agricultural Mechanization Science Research Institute, Beijing Dafa Taipinggu Livestock and Poultry Equipment Co., Ltd. The main drafters of this standard are: Qi Huichang, Heng Yongli. 1 Scope
Machinery Industry Standard of the People's Republic of China
Product Quality Classification
Chicken Chain Feeder
(Internal Use)
JB/T51225—1999
Replaces JB/T51225.1~51225.3-94
This standard specifies the quality indicators, test methods and inspection rules of chicken chain feeder products. This standard applies to the product quality classification of chicken chain feeders (including ordinary, fast and high-speed chain feeders). 2 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, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828——1987
GB/T3785—1983
JB/T5673—1991
JB/T7727—1995
3 Quality indicators
Performance indicators
Should comply with the provisions of Table 1.
Feeding unevenness
Cleanliness rate
Feed conveying volume
Breakage length
Load power
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Electrical and acoustic performance and test methods of sound level meterGeneral technical conditions for painting of agricultural and forestry tractors and machineryChain feeder for chicken
Qualified products
dB (A)
Height of pile at return feed portmm
Working stability
Working chain speed
Note: When the leakage area of the feed trough reaches 30%, it is considered as breakage. 3.2 Reliability
Should meet the requirements of Table 2.
Approved by the State Machinery Industry Bureau on December 30, 1999
Qualified products
Qualified products
≥2800
Intermittent, arching and other defects
No impact during operation,
≥2800
Implementation on June 1, 2000
Mean working time before first failure (MTIFF) The gap between the pressure strip and the chain piece is 2~3mm.
JB/T51225-1999
Ordinary chain
≥100
≥120
The manufacturing quality of the main parts and components shall comply with the provisions of Table 3. Table 3www.bzxz.net
Elongation of a single chain under 6000N tension mmPlasticity of a single chain under 6000N tension mmHardness of chain
Pitch tolerance of chain after assembly
Breaking tension of chain
Chain shall not have defects such as cracks and burrs. The quality of painting shall comply with the requirements of Table 4.
Adhesion of paint film
Appearance quality of paint
4 Test method
4.1 Basic requirements
Qualified products
Qualified products
Fast chain
≥100
High-speed chain
First-class products
≥10000
Inspect 3 points, all not lower than Grade II
Qualified products
≥10000
Qualified products
Qualified products
First-class products
≥12700
Inspect 3 points: 2 points Grade I, 1 point Grade IⅡ
Uniform color, no defects such as leakage, wrinkling, mottled face, flow marks, peeling, etc. From the time the prototype is taken out to the end of the work, the prototype or parts shall not be replaced. 4.1.1
During the test, if any abnormal situation occurs, the cause should be found out in time and necessary treatment should be taken. 4.1.3 Before the test, the manufacturer should provide necessary product drawings and technical documents. 4.2 Test conditions
The instruments, equipment, gauges and measuring tools used in the test must be within the validity period of the calibration, and must be checked and calibrated before the test. 4.2.1
4.2.2The materials used in the test should meet the standard requirements of relevant chicken feed. 4.3 Test items
Performance item test.
Reliability test (can be carried out on another prototype). Determination of the pitch tolerance of the chain after assembly.
4.3.4 Determination of the manufacturing quality of the main parts and components. 4.3.5 Determination of the quality of the paint.
4.3.6 Determination of the gap between the pressure strip and the chain. 4.4 Test Method
4.4.1 Gap between the pressure strip and the chain
JB/T51225-1999
After installation and commissioning, insert a feeler gauge between the pressure strip and the chain to measure the gap. 4.4.2 Working stability
Perform the test in accordance with the provisions of 5.2.3 of JB/T7727-1995. During the test, the total length of the material line should not be less than the design value. If the site is limited, it should not be less than 70m of the single-side material line.
4.4.3 Load power
Perform the test in accordance with the provisions of 5.2.2 of JB/T7727-1995. 4.4.4 Working chain speed
When the trough is full of material, measure the time it takes for the chain to run one circle and calculate it according to formula (1): V
Wherein: V working chain speed, m/s;
S distance, m;
t chain running one circle time, s.
4.4.5 Cleaning rate
According to the provisions of 5.2.4 of JB/T7727-1995. 4.4.6 Feeding unevenness
According to the provisions of 5.2.5 of JB/T77271995. 4.4.7 Cutting length
According to the provisions of 5.2.6 of JB/T7727-1995. 4.4.8 Productivity
According to the provisions of 5.2.1 of JB/T7727-1995. 4.4.9 Noise
See Appendix A (Standard Appendix).
4.4.10 Height of stacking at the return port
Use a ruler to measure the maximum height of stacking at the return port. 4.4.11 Appearance of chain
Visually inspect the surface of the chain and there shall be no defects such as cracks and burrs. 4.4.12 Chain pitch tolerance
According to the provisions of 5.1.1 of JB/T7727-1995. 4.4.13 Chain hardness
Punch 3 points on each chain, evenly distributed on the surface of the chain, and take the average value. 4.4.14 Elongation of a single chain
JB/T51225-1999
According to the provisions of 5.1.2 of JB/T7727-1995. 4.4.15 Plastic deformation of chain
shall be carried out in accordance with the provisions of 5.1.2 of JB/T7727-1995. 4.4.16 Breaking tension of chain
shall be carried out in accordance with the provisions of 5.1.2 of JB/T7727-1995. 4.4.17 Reliability
shall be assessed by the average working time before the first failure and calculated according to formula (2): MTTFF
Wherein: n—number of investigated or tested prototypes: factory—number of investigated or tested prototypes that have experienced the first failure during the use or test time; t—accumulated working time when the i-th prototype has the first failure, h; t—accumulated working time of the j-th prototype that has not experienced the first failure at the end of the investigation or test, h. If all the prototypes have no faults, then it can be expressed as formula (3): MTTFF≥
4.4.18 Paint film adhesion
According to the provisions of JB/T5673.
4.4.19 Paint appearance quality
Visually inspect the paint surface.
5 Inspection rules
5.1 Classification of unqualified items
5.1.1 Chicken chain feeder products should be inspected and judged according to the classification of unqualified items listed in Table 5 and the sampling inspection plan in Table 6 according to the counting sampling inspection procedure principles specified in GB/T2828. 5.1.2 All items that are tested that do not meet the requirements of Chapter 3 of this standard and relevant standards, drawings and technical documents are unqualified items. 5.1.3 Unqualified items are divided into three categories: A, B and C according to their impact on the product. Category A is an item that has a significant impact on the product: Category B is an item that has a greater impact on the product: Category C focuses on parts, manufacturing and assembly quality items. 5.2 Sampling method
5.2.1 Sampling inspection procedure According to the normal sampling plan specified in GB/T2828, the special inspection level S-15.2.2 is adopted. Random sampling is adopted, and the products produced by the factory in the past year are randomly selected. The sampling parent quantity should be no less than 10 units, 2 units of complete machines are sampled, and 2 parts and components are sampled. Samples can be drawn from the finished product or semi-finished product warehouse, and this restriction does not apply when sampling in the sales department. The samples drawn should be qualified products of the corresponding grade.
5.3 Assessment rules
5.3.1 Products are sampled and judged according to the requirements of Table 6. The qualified quality level AQL, qualified judgment number Ac, and unqualified judgment number Re in the table are calculated by the point method (i.e. the number of unqualified items). 5.3.2 The assessment is conducted item by item. When the number of unqualified items in each category in the sample is less than or equal to the qualified judgment number Ac, the category is judged as qualified. The inspection should make qualified and unqualified judgments according to each type of sampling inspection plan. The grade that is qualified in categories A, B, and C is determined as the product grade. 4
Unqualified classification
Number of samples
Inspection level
Qualified products
First-class products
JB/T51225-1999
Unqualified name
Chain has cracks
Broken length
Chain breaking tension
Reliability
Unevenness
Chain plastic deformation
Chain elongation
Load power
Working stability
Cleanliness rate||tt ||Productivity
Working chain speed
Chain piece hardness
Height of pile at the return port
Gap between pressure strip and chain piece
Paint film adhesion
Appearance quality of paint
Chain piece pitch tolerance
According to Table 5
A1 Measuring instruments
JB/T51225-1999
Appendix A
(Appendix of standard)
Determination of noise
A1.1 Sound level meter shall comply with the provisions of GB/T3785. A1.2 Measuring instruments shall be checked regularly. The measuring system shall be calibrated before and after each measurement. If the calibration value before and after the measurement differs by 1dB (A), the measurement is invalid.
A2 Measurement environment and correction value
A2.1 Measurement environment
A21.1 The measurement should be carried out outdoors in an open and flat area. The wind speed should not exceed 5m/s during measurement. The ground surface should be hard, and there should be no obstacles or motor vehicles that reflect sound within 10m around the machine. A21.2 During measurement, the operator should be equipped according to the provisions of the instruction manual, and other personnel should not enter the measurement area. A22 Correction of background noise
A2.2.1 During measurement, the total noise value of each point of the measured machine should be greater than the noise of each point by 10dB (A). A2.2.2 When the difference between the total noise measured at each point and the background noise is less than 10dB (A), correction should be made. The noise level at the measurement point is the total noise value of the point minus the correction value.
A3 Measurement method
A3.1 Use the A-weighted network of the sound level meter to measure the A sound level. A3.2 When a free-field microphone is used, the microphone should point to the sound source. A3.3 The dynamic setting of the sound level meter is "slow", and the reading is the average value of the pointer swing. A3.4 When measuring, there are 5 measuring points, 1 meter away from the maximum outer surface of the material box and 1.5 meters in height, 1 point in each of the four directions, and 1 meter away from the upper surface of the material box. The average value of the 5 points is taken. 6
Mechanical Industry Standard
Product Quality Classification of Chicken Chain Feeder
(For Internal Use)
JB/T51225-1999
Published and Distributed by China Academy of Mechanical Science
Printed by China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880X12301/16 Printing Sheet 3/4 Number of Words 14.000First Edition in April 2000
First Printing in April 2000
Print Quantity 1-500
Price 1500 Yuan
No. 99-1574
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn666Measure one point in each of the four directions at a distance of 5 meters from the top surface of the material box, and measure one point 1 meter from the top surface of the material box. Take the average value of the five points. 6
Mechanical Industry Standard
Product Quality Classification of Chicken Chain Feeder
(For Internal Use)
JB/T51225-1999
Published and Distributed by China Academy of Mechanical Science
Printed by China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880X12301/16 Printing Sheet 3/4 Number of Words 14.000First Edition in April 2000
First Printing in April 2000
Print Quantity 1-500
Price 1500 Yuan
No. 99-1574
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn666Measure one point in each of the four directions at a distance of 5 meters from the top surface of the material box, and measure one point 1 meter from the top surface of the material box. Take the average value of the five points. 6
Mechanical Industry Standard
Product Quality Classification of Chicken Chain Feeder
(For Internal Use)
JB/T51225-1999
Published and Distributed by China Academy of Mechanical Science
Printed by China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880X12301/16 Printing Sheet 3/4 Number of Words 14.000First Edition in April 2000
First Printing in April 2000
Print Quantity 1-500
Price 1500 Yuan
No. 99-1574
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn666
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