JB/T 50104-1997 Product quality classification of hand-held variable conveyors
Some standard content:
The Machinery Industry Standard of the People's Republic of China
JB/T50104-1997
Product Quality Classification of Hand-held Conveyor
(For Internal Use)
Published on November 28, 1997
The Ministry of Machinery Industry of the People's Republic of China
Implemented on May 1, 1998
JB/T50104-1997
General Technical Conditions" was formulated. When formulated, according to the current actual situation of the hand-held conveyor industry, this standard is based on JB/T8657-1997 "The quality of products is appropriately classified. This standard is proposed by the National Technical Committee for Tractor Standardization. This standard is under the jurisdiction of the Luoyang Tractor Research Institute of the Ministry of Machinery Industry. The drafting units of this standard are: Luoyang Tractor Research Institute of the Ministry of Machinery Industry, Hengyang Tractor Factory, Guiyang Red Star Tractor Factory, and Kunming Hand Tractor Factory.
The main drafters of this standard are Pan Keqiu, Wang Fangqin, Xue Xixian, Li Zhenghui and Li Jianxin. 1 Scope
Machinery Industry Standard of the People's Republic of China
Product Quality Grading of Hand-held Conveyor
(Internal Use)
This standard specifies the product quality grading indicators, test methods and inspection rules of hand-held conveyor. JB/T50104-1997
This standard is applicable to the inspection and grade assessment of product quality of hand-held conveyor (hereinafter referred to as conveyor) with a maximum speed not exceeding 40km/h.
2 Referenced 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 version of the following standards. GB 2828-87
GB 72581997
JB/T567391
JB/T723594
JB/T773695
ZB T60 00689
3 General requirements
Batch inspection Count sampling procedures and sampling tables (applicable to inspection of continuous batches) Technical conditions for motor vehicle operation safety
General technical conditions for painting of agricultural and forestry tractors and machinery Test methods for four-wheeled agricultural transport vehicles
Reliability assessment of four-wheeled agricultural transport vehicles
Determination method for adhesion performance of paint film of agricultural and forestry tractors and machinery Press cutting method 3.1 The quality classification of transport products shall comply with the requirements of this standard and shall be manufactured according to the product drawings and technical documents approved through the prescribed procedures. 3.2 The parts, components and accessories of transport products shall comply with the relevant standards. 3.3 Test methods and inspection rules shall be in accordance with the provisions of Chapter 6 and Chapter 7. 4 Product quality classification
According to the technical level and quality level of transport aircraft products, they are divided into qualified products, medium products and superior products. Products that do not meet the qualified product indicators are unqualified products.
5 Product quality grade indicators
5.1 Diesel engine power
The rated power of the diesel engine (1h power) shall comply with the factory specified value, with a tolerance of ±5%. Note: The factory specified value refers to the value specified in the factory product manual and product technical standards (the same below). Fuel economy
The average fuel consumption of the transport aircraft at a constant speed under six working conditions shall comply with the provisions of Table 1. Table 1
Qualified products
Approved by the Ministry of Machinery Industry on November 28, 1997
1/ (t ·100km)www.bzxz.net
Implemented on May 1, 1998
Low temperature starting performance
JB/T50104—1997
The minimum starting temperature of the transport aircraft shall comply with the provisions of Table 2. Table 2
Engine type
Electric start
Qualified products
Note: The starting preheating device installed on the transport aircraft is allowed to be used5.4 Free acceleration exhaust smoke
In areas below 1000m above sea level, the free acceleration smoke value shall comply with the provisions of Table 3. Table 3
Qualified products
5 Maximum speed
The maximum speed shall comply with the factory specified value, with a tolerance of ±5%. 5.6 The lowest stable speed in the highest gear
The percentage of the lowest stable speed in the highest gear to the factory-specified maximum speed shall comply with the provisions of Table 4. Table 4
Qualified products
5.7 Sliding performance
Excellent products
≤-10
Excellent products
Excellent products
When the transporter is fully loaded and glides at a speed of 20km/h on a flat, dry concrete or asphalt road, the sliding distance shall comply with the provisions of Table 5.
Qualified products
Braking performance
Excellent products
≥100
5.8.1 When the maximum control force of the brake pedal is not more than 600N and the test speed is 20km/h, the braking distance of the fully loaded and unloaded vehicles shall not exceed 6.5m.
5.8.2 During the braking stability test, any part of the transporter shall not exceed the width of the test track of 23m. 5.8.3 When the transporter is unloaded, it shall be able to park reliably on the uphill and downhill slopes with a slope of 20%. 5.9 Steering wheel free travel
The steering wheel free travel shall not exceed 30° when driving in a straight line. 5.10 Operating force
The operating force of the steering wheel, clutch, brake, etc. shall comply with the provisions of Table 6. 2
Operating force
1 Noise
Service brake pedal
≤600
JB/T50104-1997
Parking handle
≤300
Dynamic environmental noise shall comply with the provisions of Table 7. 5. 11. 1
Qualified products
The noise at the driver's operating position shall comply with the provisions of Table 8. Table 8
Qualified products
Lifting performance of dump truck carriage
Clutch pedal
≤250
Steering wheel
≤200
dB (A)
Superior products
Superior products
5.12.1 The inclination angle of the carriage should be no less than 45°. When the engine is running at the rated speed, the time for lifting the fully loaded carriage to the maximum inclination angle should not be more than 20s
When overloaded by 10%, the carriage stays for 5 minutes when it is lifted to 20°. The settlement rate of the carriage should comply with the requirements of Table 9. Table 9
Qualified products
5.13 Reliability
Excellent products
The test mileage of each transport aircraft is 10000km, and the mean failure interval mileage MTBF (km) and the comprehensive score value of trouble-free performance shall comply with the provisions of Table 10.
Reliability requirements
MTBF (m)
0 (points)
5.14 Safety protection
Qualified products
≥2500
5.14.1 The front windshield of the cab shall be safety glass, and a rearview mirror shall be installed on each side. Excellent products
≥3300
5.14.2 A safety frame higher than the cab shall be installed at the front of the truck box. If there is no cab, its height shall be 0.8~1m higher than the plane of the driver's seat cushion. 5.15 Lighting, signal devices and instruments
Should meet the requirements of GB7258
5.16 Painting
The painting of transport aircraft shall meet the requirements of JB/T5673, and the cab, hood and other covering parts shall also meet the requirements of Table 113
Qualified products
JB/T50104—1997
①Meet the requirements of the main quality indicators of TQ-1-2-DM (or TQ-1-3-DM) in Table 2 of JB/T5673.
②The adhesion performance shall not be lower than Grade II
5.17 Appearance quality
Superior products
①Meet the requirements of the main quality indicators of TQ-1-1H-DM in Table 2 of JB/T5673
② The adhesion performance is not less than level 1
The appearance of the conveyor is reasonably arranged, beautiful and symmetrical, the surface of the exposed parts is smooth, and the shell joints are neat. The appearance quality assessment adopts a scoring method: 10 points are the full score, qualified products are not less than 6 points, first-class products are not less than 8 points, and superior products are not less than 9 points. 5.18 Sealing
During the running-in operation and performance test, there shall be no oil leakage, water leakage or air leakage at the sealing surfaces and pipe joints in accordance with the provisions of Table 12. 5.19 During the running-in operation and performance test, serious or fatal faults are not allowed. Table 12
Qualified products
After the fasteners are adjusted, there are no more than three leaks, no dripping
6 Test methods
6.1 General
After the fasteners are adjusted, there is no leakage
Superior products
No adjustment or tightening is allowed, no leakage6.1.1 The sampling of samples shall be carried out in accordance with the relevant provisions of Chapter 7. From the beginning to the end of the test work, no repair, adjustment or replacement is allowed except for the maintenance and adjustment specified in the instruction manual. 6.1.2 All instruments and equipment used for measurement shall be inspected and calibrated before the test (except within the validity period of calibration), and their accuracy shall meet the measurement accuracy requirements.
6.1.3 The measurement accuracy of various parameters shall comply with the provisions of JB/T7235. 6.1.4 The test conditions of various test items shall comply with the provisions of JB/T7235 and this standard. 6.2 Inspection Items
Inspection items include:
a) Acceptance;
b) Appearance quality inspection:
c) Paint quality inspection;
d) Safety protection inspection;
e) Lighting, signal device and instrument inspection:
g) Steering wheel free travel measurement;
h) Control force measurement;
i) Engine rated power test:
i) Maximum vehicle speed measurement:
k) Sliding distance measurement:
I) Minimum stability Vehicle speed measurement;
mFuel economy measurement;
n)Cold brake performance test;
o)Braking stability measurement;
p)Parking brake performance test;
q)Environmental noise measurement:
)Noise measurement at the driver's operating position:s)Free acceleration smoke measurement
t)Low temperature starting performance test;
u)Dump box inclination angle and lifting time measurementv)Dump box self-descent rate measurement;
w))Sealing inspection;
x)Reliability test.
6.3Test method
6.3.1Acceptance
JB/T50104-1997
Check whether the tested machine is consistent with the pumping list, whether all equipments are complete, and whether all parts are operating normally. 6.3.2 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter shall be parked in the straight-ahead position, and its free travel shall be measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6603 The measurement accuracy of various parameters shall comply with the provisions of JB/T7235. 6.1.4 The test conditions of various test items shall comply with the provisions of JB/T7235 and this standard. 6.2 Test items
Test items include:
a) Acceptance;
b) Appearance quality inspection:
c) Paint quality inspection;
d) Safety protection inspection;
e) Lighting, signal device and instrument inspection:
g) Steering wheel free travel measurement;
h) Control force measurement;
i) Engine rated power test:
i) Maximum vehicle speed determination:
k) Sliding distance measurement:
I) Minimum stability Vehicle speed measurement;
mFuel economy measurement;
n)Cold brake performance test;
o)Braking stability measurement;
p)Parking brake performance test;
q)Environmental noise measurement:
)Noise measurement at the driver's operating position:s)Free acceleration smoke measurement
t)Low temperature starting performance test;
u)Dump box inclination angle and lifting time measurementv)Dump box self-descent rate measurement;
w))Sealing inspection;
x)Reliability test.
6.3Test method
6.3.1Acceptance
JB/T50104-1997
Check whether the tested machine is consistent with the pumping list, whether all equipments are complete, and whether all parts are operating normally. 6.3.2 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter shall be parked in the straight-ahead position, and its free travel shall be measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6603 The measurement accuracy of various parameters shall comply with the provisions of JB/T7235. 6.1.4 The test conditions of various test items shall comply with the provisions of JB/T7235 and this standard. 6.2 Test items
Test items include:
a) Acceptance;
b) Appearance quality inspection:
c) Paint quality inspection;
d) Safety protection inspection;
e) Lighting, signal device and instrument inspection:
g) Steering wheel free travel measurement;
h) Control force measurement;
i) Engine rated power test:
i) Maximum vehicle speed determination:
k) Sliding distance measurement:
I) Minimum stability Vehicle speed measurement;
mFuel economy measurement;
n)Cold brake performance test;
o)Braking stability measurement;
p)Parking brake performance test;
q)Environmental noise measurement:
)Noise measurement at the driver's operating position:s)Free acceleration smoke measurement
t)Low temperature starting performance test;
u)Dump box inclination angle and lifting time measurementv)Dump box self-descent rate measurement;
w))Sealing inspection;
x)Reliability test.
6.3Test method
6.3.1Acceptance
JB/T50104-1997
Check whether the tested machine is consistent with the pumping list, whether all equipments are complete, and whether all parts are operating normally. 6.3.2 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter shall be parked in the straight-ahead position, and its free travel shall be measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6602 Inspection items
Inspection items include:
a) Acceptance;
b) Appearance quality inspection:
c) Paint quality inspection;
d) Safety protection inspection;
e) Lighting, signal device and instrument inspection:f Running-in:
g) Steering wheel free travel measurement;
h) Control force measurement;
i) Engine rated power test:
i) Maximum speed measurement:
k) Sliding distance measurement:
I) Minimum stable vehicle speed measurement;
m fuel economy measurement;
n) cold brake performance test;
o) brake stability measurement;
p) parking brake performance measurement;
q) environmental noise measurement:
) noise measurement at the driver's operating position:s) free acceleration smoke measurement
t) low temperature starting performance test;
u) dump box inclination angle and lifting time measurementv) dump box self-descent rate measurement;
w)) sealing inspection;
x) reliability test.
6.3 Inspection test method
6.3.1 Acceptance
JB/T50104-1997
Check whether the tested machine is consistent with the pumping machine list, whether all equipments are complete, and whether all parts are operating normally. 6.3.2 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter shall be parked in the straight-ahead position, and its free travel shall be measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6602 Inspection items
Inspection items include:
a) Acceptance;
b) Appearance quality inspection:
c) Paint quality inspection;
d) Safety protection inspection;
e) Lighting, signal device and instrument inspection:f Running-in:
g) Steering wheel free travel measurement;
h) Control force measurement;
i) Engine rated power test:
i) Maximum speed measurement:
k) Sliding distance measurement:
I) Minimum stable vehicle speed measurement;
m fuel economy measurement;
n) cold brake performance test;
o) brake stability measurement;
p) parking brake performance measurement;
q) environmental noise measurement:
) noise measurement at the driver's operating position:s) free acceleration smoke measurement
t) low temperature starting performance test;
u) dump box inclination angle and lifting time measurementv) dump box self-descent rate measurement;
w)) sealing inspection;
x) reliability test.
6.3 Inspection test method
6.3.1 Acceptance
JB/T50104-1997
Check whether the tested machine is consistent with the pumping machine list, whether all equipments are complete, and whether all parts are operating normally. 6.3.2 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter shall be parked in the straight-ahead position, and its free travel shall be measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6602 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter is parked in the straight-ahead position, and its free travel is measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not meet the requirements
Maximum speed does not meet the requirements||t t||Fuel economy does not meet the requirements
Low temperature starting performance does not meet the requirements
Paint quality does not meet the requirements
Appearance quality does not meet the requirements
Steering wheel free travel does not meet the requirements
Operating force does not meet the requirements
Sealing does not meet the requirements
Car body inclination angle does not meet the requirements
Sliding performance does not meet the requirements
Minimum stable speed does not meet the requirements
Car body lifting time does not meet the requirements
Car body self-lowering rate does not meet the requirements
General failures
2 Unqualified items in reliability test are assessed separately 7.3.2
7.4 Three levels of AQL values
7.4.1 The qualified quality level of transport aircraft is specified according to the three levels of qualified products, first-class products and superior products, that is, the AQL value is specified according to the unqualified classification. The AQL value is the number of unqualified products per hundred units. 7.5 Sampling plan
7.5.1 This standard is based on the normal sampling plan specified in GB2828, and specifies the use of special inspection level S-1. In general, the inspection batch N=26~50 units. 7.5.2
7.5.3 This standard specifies the sample size F-2, and the inspection is carried out according to the items listed in Table 1. When sampling, it should also consider adding 1~2 spare machines, which are only used when the quality problems of non-products themselves make it impossible to conduct normal tests and make correct judgments. 6
7.5.4 The sampling plan is shown in Table 14.
7.6 Implementation of sampling inspection
JB/T50104—1997
7.6.1 Samples should be drawn on the production line of the manufacturer, and the samples drawn should be qualified products of the corresponding grade. 7.6.2 Sampling must be carried out suddenly and randomly. It is recommended to use random number table sampling. 7.6.3 For the reliability test, two samples are randomly selected. 7.7 Evaluation of sampling inspection
7.7.1 According to the sampling plan specified in 7.5, the samples are checked. When the number of unqualified samples is less than or equal to Ac, it is evaluated as qualified; when it is greater than or equal to Re, it is evaluated as unqualified. When all categories are qualified, they are finally evaluated as qualified; when any one or more categories are evaluated as unqualified, they are finally evaluated as unqualified.
7.7.2 When evaluating the grade of transport aircraft, according to the sampling plan, if one category reaches a higher grade and some categories reach a lower grade, they should be rated according to the lower grade during the evaluation.
7.7.3 If the reliability test does not meet the requirements, the grade of the product is still evaluated as unqualified. 7.7.4 During the entire performance test, if serious failures and fatal failures occur due to product quality problems, the inspection will be stopped and the product will be treated as unqualified.
For products with a certain grade, the grade of each conveyor leaving the factory should not be higher than the grade. Table 14 Sampling plan
Unqualified classification
Inspection level
Number of samples n
Qualified products
First-class products
Superior products
Mechanical industry standards
Product quality classification of hand-held variable conveyors
(for internal use)
JB/T50104-1997
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, zip code 100044)*
Format 880×12301/16 Printing sheet 3/4
Word count 16,000
First edition in December 1997
First printing in December 1997
Print run 1-500
Price 1500 yuan
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6602 Appearance quality inspection
3 to 5 people from different departments shall evaluate the appearance quality of the tested machine, whether the overall layout is coordinated and reasonable, etc. and score them on a 10-point scale, and take the average value.
6.3.3 Paint quality inspection
The paint quality shall be inspected in accordance with JB/T5673, and the paint film adhesion performance shall be inspected in accordance with the method of ZBT60006. 6.3.4 Safety protection inspection
Inspect in accordance with the requirements of 5.14.
6.3.5 Lighting, signal devices and instrument inspections shall be inspected item by item in accordance with the relevant provisions of GB7258.
6.3.6 Running-in
Perform in accordance with the instructions for use, and any faults that occur during the running-in period shall be recorded. 6.3.7 Steering wheel free travel
The transporter is parked in the straight-ahead position, and its free travel is measured with a steering angle force meter. 6.3.8 Test according to the provisions of JB/T7235
Control force, engine rated power, maximum speed, gliding distance, minimum stable speed, fuel economy, braking performance, noise, free acceleration smoke, low temperature starting performance, dump box inclination, lifting time and self-descent rate, etc. 6.3.9 Braking stability measurement
Draw a 2.3m test track edge line on the test road surface, and after the test transporter drives along the center line of the test track to a speed higher than the specified initial speed, put the gearbox in neutral, and when it glides to the specified initial speed, suddenly step on the brake to stop the transporter. 6.3.10 Sealing inspection
During the entire test process, the sealing conditions of various places should be carefully checked at any time, and the oil leakage, water leakage, and air leakage should be handled, analyzed and recorded.
6.3.11 Reliability test
Reliability refers to the provisions of JB/T7736.
7 Inspection rules
7.1 Quality grading indicators
Products are divided into three grades: qualified products, first-class products and superior products according to their technical level and quality level. The grading indicators shall be in accordance with the provisions of Chapter 5. 5
2 Test methods
The test methods shall be in accordance with the provisions of Chapter 6.
7.3 Classification of nonconformities
JB/T50104-1997
7.3.1 The inspected items that do not meet the requirements specified in Chapter 5 are called nonconformities: they are classified into Class A nonconformities, Class B nonconformities, Class C nonconformities and Class D nonconformities according to the degree of impact that each nonconformity may have on product quality. The nonconformities and their classifications are shown in Table 13. Table 13 Classification of nonconformities
Nonconformity items
Safety protection does not meet the requirements
Lighting, signal devices and instruments do not meet the requirementsCold braking distance does not meet the requirements
Parking brake performance does not meet the requirements
Braking stability does not meet the requirements
Noise does not meet the requirements
Free acceleration smoke does not meet the requirements
Rated power of diesel engine does not
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