Some standard content:
Machinery Industry Standard of the People's Republic of China
JBT51082-2000
Reliability Assessment of Tractor Products
(Internal Use)
2000-08-30 Issued
State Machinery Industry Bureau
2000-12-01 Implementation
J105220
25: Application Standard
3 Terms and Definitions
4 Fault Classification and Judgment Rules
5 Evaluation Index System
6 Evaluation Force Method
7 Application Test Method
Appendix A (Suggestive Appendix) Test Report Format Record B [Suggestive Appendix] Tractor Failure Examples Contents
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Quick Order for Non-standard and Matching/T51082.1~51082.3-94. During the revision, the original standard parts were revised and revised, and the main technical contents remained unchanged.
This standard replaces Appendix A of IB/T51082.1~51082.194 from the time of implementation. Appendix B is a small appendix: This standard is proposed by the National Technical Committee for Standardization of Tractors. The responsible person for this standard is Luoyang Tractor Research Institute. The drafters of the small standard are Yi Qingchen, Fan Jianhua, Chen Zhiqiang, Yang Xiwu, and Xu Yanhui. J
Scope
Machinery Industry Standard of the People's Republic of ChinabzxZ.net
Reliability Assessment of Tractor Products
[Internal Use)
JB/T 51082—2000
Replacement JB/510821-5118219
This standard specifies the technical and definition of reliability assessment of tractor products, fault classification and interruption rules, index system and assessment method, and reliability test and monitoring method of tractor. This software is used to assess the reliability of mass-produced tractors: the reliability test of tractors can also be used for reference: 2 Referenced Standards
The provisions contained in the following standards constitute non-increased provisions by reference in the standard. When this standard is published, the versions shown are valid: All standards are subject to revision. All parties using this standard should carefully test and use the latest possible version of the following standards. 3871---199.
GA-T 6229--1995
3 Terms and definitions
Test methods for agricultural wheeled and crawler tractors
This standard adopts the following terms and definitions:
3.1 Tractor operating time
The operating time of the tractor during the operation of various parts. It includes the tractor load operation time, the turning time, and the tractor idle time (1h of operating time is converted to 5h of idle time). It does not include the tractor running time, the test time and the start time. 3.2 Repair work time
refers to the total time for fault diagnosis, troubleshooting and testing, excluding time caused by human or natural factors. 3.3 Maintenance work time
The working time required to complete the maintenance specified in the instruction manual. Including the time used for shift maintenance and various natural maintenance, excluding time caused by human or natural factors. 3.4 Failure
The tractor or its parts cannot fully perform their specified functions or their performance is reduced for more than Phenomena that exceed the specified range. For example: parts are damaged, grinding and polishing exceed the limit. Weld cracking, oil peeling, fasteners loose, nameplate falling off, starting difficulties, power reduction, oil consumption, slow lifting, etc. exceed the specified value. 3.5 Essential failure
Failures caused by defects in the parts of the tractor are called essential failures. Examples: deformation, fracture, excessive wear and tear, film corrosion, aging, fasteners loose or sharp, performance degradation beyond the limit and "three" caused by workmanship, material, processing and assembly. 3.6 All faults
Approved by the State Machinery Industry Bureau on August 30, 2000 and implemented on December 1, 2000
Failures caused by essential faults J/T5H082-2M0
For example: the engine is broken due to continuous friction, which leads to the damage of other parts in the bearing. The continuous friction fracture is an essential fault, and the damage of other parts caused by this is also a fault. 3.7 Misuse faults
Faults caused by users not using and operating according to the instructions are misuse faults. For example: the driver does not add fuel or water according to the regulations, which leads to engine failure and burning of cylinders; the user changes the structure or adjustment state of the engine, uses it beyond the limit, etc., which causes damage to related parts and components. 4 Fault classification and demarcation rules
According to the degree of harm caused by the machine fault and the easiness of eliminating the fault, the fault is divided into four categories: injury-causing fault, serious fault, minor fault and minor fault. Their categories, names and codes are shown in 1. The most serious and life-threatening faults are also shown in
fatal faults
productive faults
general faults
longitude faults
4.2 Judgment rules
can cause personal injury or property damage, cause serious damage to the equipment, and ensure that the machine is used properly. The failure is beyond the scope of the regulations and the cost is light. The effective time is relatively long. The faults that need to be removed should be replaced during the maintenance. The parts that have a strong impact on the machine should be replaced. The cost is moderate. In the effective time of the plan, we can replace the minor faults that have a minor impact on the machine quickly. It will not cause interruption of work. The maintenance cost is low. The minor faults should be carefully used in the necessary maintenance. The number and time of the major faults that occur at the same time as the main fault (that is, the most serious fault) should be recorded. If the main fault and the secondary fault do not occur at the same time, the fault category with the most serious consequence should be recorded, and the fault time should be recorded according to the time when the main fault occurs. Other faults are not counted in the number of faults, but they should be recorded truthfully in the registration form.
4.2.2 When judging the fault type of the test machine, its fault type should be determined by its final delayed consequences. It can only be judged as the least of the four types of faults.
4.2.3 Spare parts that are maintained and replaced regularly according to the instructions for use do not need to be handled, but records should be kept. 4.2.4 When counting the number of failures such as "leakage" and fastener failure, only one change is counted for each sealing joint surface, and the most serious type and degree are recorded in time.
4.25 After the fault is eliminated, the number of fault changes should be counted separately for the recurring faults. 4.7.6 When judging the fault type: you can refer to Appendix B (Appendix 1. Due to the different standards of various pulling machines, the difficulty of troubleshooting the same fault will be quite different. The fault classification and definition are fully controlled. Consider examples and judge the category according to the specific situation. ||tt| |Evaluation index system
The tractor serviceability evaluation index system is shown in Table 2.
Failure
Economy
Average working time before the first failure
Where: MTTFE
851082-20
Serviceability index
Average working time after first failure
Average recovery time
Average downtime between failures
No recovery comprehensive score
1. Factory annual average warranty cost rate
Tractor first failure Average working time before failure, b: Number of tractors under test or investigation: Number of tractors under test or investigation that experienced their first failure (except minor failures) during the use or test time (including the running-in and performance test period);
- The cumulative working time of the first tractor when it experienced its first failure, h; The cumulative working time of the first tractor without experiencing its first failure at the end of the reliability test or user investigation, v; For test tractors, the specified timed truncation test time, h. If all the tested tractors do not experience any failure (except minor failures), (except for minor faults), MTTFF>5.2 Mean Time Between Failures
Where: MTBP
Mean time between failures of the tractor, 5: represents,
The first is the time of the scheduled load test of the tested tractor, h, for the investigated tractor, it is the cumulative time, h;
The total number of failures (except minor failures) that occurred during the test or investigation period of the tested or investigated tractor (including the running-in and test period).
If all the tested tractors have no failures (except minor failures), MTBF: 5.3 Average downtime failure interval time
DTMTBK
Where: DTMTBF-
Average downtime failure interval time of the tractor, h; Iu
means
the total number of machine failures (i.e. fatal failures and serious failures) that occurred during the test period (including the running-in and performance test period) of the tested or investigated tractor. 3
JB/T108-2000
All tested tractors have machine failures, which are indicated by DTMIBF>5.4 invalid failure score
. During the test period, if there are several fatal failures in the tested tractors, the total score of the machine is judged to be qualified and no more values are calculated. For the tractors tested without fatal faults, the comprehensive fault-free rating is calculated according to formula (4): (K, E.)
0-100-
where: 2 is the comprehensive fault-free rating of the tested tractor, T is the standard machine quality rating, MTRF is the standard value, h is the number of tractors tested as specified in the competition, 1 is the trial test time specified in the competition, 2 is the total number of faults that occurred in the tested tractor during the specified final test, and R is the standard value. The hazard coefficient of each failure rate is stipulated as follows: Class Severe Failure (YZ): -30.0
Class General Failure (YD): KB.0
Class Minor Failure (QD): K=1.0
The time coefficient of the first failure: E
E-2T,T
When the tested tractor has the first failure, the total failure time of the tractor, h, when the calculation result <0, it is stipulated to be calculated in minutes:
5.5T. The average annual warranty cost rate of the factory
PWC=C_/ C,=100%
Where: PwC
A certain type of tractor.1 Factory average annual warranty: 53
C——During the first warranty period of a certain type of tractor, the manufacturer charges a fee for each unit of the "one package" service for the user, or the total cost of troubleshooting the tractor during the first test period specified in the competition [including parts cost and maintenance fee), yuan;
"-The selling price of each unit of this type of tractor, yuan. 6 Evaluation method
6.1 Data source
The data for evaluating the tractor's tractability can come from the following three aspects: 6, convenient test| |tt||According to the provisions of Chapter 7, the reliability test is carried out in combination with the production of products. 6.1.2 Test or test field reliability test It is a reliability test carried out in a test room with controlled conditions or on a test field according to the methods specified in the relevant standards. It is necessary to know in advance the equivalent relationship between the test time and the actual user's use time. 6.1.3 User survey
JB/F51082-2000
The reliability data of the tractor in actual use obtained by conducting a sample survey or a full tracking survey among users. 6.2 Fault diagnosis
All faults of tractors are determined according to the provisions of Chapter 4. The nature and type of each fault shall be determined separately, and this shall be used as the basis for calculating relevant indicators:
(.3 Indicator marking method
The format of tractor reliability index marking is: Index code = index value (number source)
Example: The reliability index of type xx tractor is as follows: MTTFF-150h (3×500h use test) M7BF-250h (3×500h use test) D1MB.-500h (3×500 use test) 2-80 points (3×500 use test)
PwC-[.5% (3=500 use test) Test
! Test method
7.1 Equipment
Power output shaft test bench (or engine dynamometer), hydraulic test bench, consumption test equipment, timer, tape measure and thermometer, etc. The measurement accuracy of all parameters shall comply with the provisions of GR/T3971. 7.2 Prototype
7.2.1 Number of test prototypes: 2 for tractors with engine rated power greater than 15kW, and 3 for others. 7.2.2 Sampling method: The sampling personnel responsible for the test shall supervise and randomly select from the tractors that are in production and have passed the acceptance inspection. For a certain number of tractors with an annual output of less than 20,000 units, the sampling base shall not be less than 26; for tractors with an annual output of less than 20,000 units. The sampling base shall not be less than 36: for tractors with an annual output of more than 40,000 units, the sampling base shall be less than 50. 7.1.3 The sample taker shall be responsible for sealing and cutting the sample, and filling in the sampling registration form according to Table A1. The test sample (mostly spare sample) selected from the sample in accordance with 7.2.1 shall be sent to the manufacturer for evaluation and inspection, and submitted to the test unit for acceptance according to Table A2. If the seal of the test sample is found to be broken, the qualification for evaluation shall be cancelled; if the test unit confirms that it is caused by an accident, it can be put into the test or the spare sample can be used for the test.
7.2. Each test machine sent to the test site shall have the following documents, spare parts and matching tools, and shall be accepted:! Sampling registration form for tractor excavator:
b) Tractor factory certificate;
! Tractor manual
) Random parts and random tools
) Machine tools approved by the test responsible unit (at least including the model and vehicle. 7.3 Test method
7.3.1 The test sample should be selected and maintained according to the instructions, and put into the test after warming up. The electrical conditions are recorded in Table A2. The faults found during this period are recorded in Table 6. The cumulative downtime of the tractor is calculated in equal hours. JB/T$1082-200
7.3.2 If no adjustments are made before and after the test (except for the maintenance performed according to the instructions, in the same test Equipment, carry out the following performance tests, and record the results in Table A3~Table A5. 3.2.1 Power output shaft test
The test is carried out on the power output shaft test bench. For the impact and pulling machine without power output shaft, the engine bench test is carried out. The test is carried out in accordance with the relevant provisions of GB/13871 or 06229, and the calibration transfer maximum power test and variable load test are carried out. 7.3.1.2 Hydraulic suspension test
According to the provisions of GT3871, the lifting time, lifting stroke and static settlement value when the maximum lifting load specified in the instruction manual is added to the special frame are measured.
7. 3. 2.3 Braking test
According to the provisions of GBT3871, measure the most average full speed of cross-state braking and the difference in brake marks between the left and right wheels. 7.3.3 Put the test prototype into normal use in actual use. It should be used and maintained strictly in accordance with the provisions of the instruction manual. All operating qualities should meet the agronomic requirements. 7.3.3.1 Table A records the test conditions of each test prototype in detail. 7.3.3.2 The total operating time of each test prototype. For tractors with rated engine power greater than 15W, it is 750h; for other tractors, it is 500h. 3.3.3 Operation items of each test sample: For wheeled tractors and walking tractors, field operation items (ploughing, sowing, harvesting, etc.) account for 70% of the total working time, and transportation operation accounts for 30%. Fixed operation is not allowed. Crawler tractors are all day operations, and group fixed operations are not allowed; forestry logging tractors are all logging operations. The operation items and time proportions of other special-purpose machines shall be reported separately. 7.3.3.4 During the test, the hourly fuel consumption of various operations shall be calculated at any time to judge and adjust the load level of each test sample. The field operation average load factor of wheeled and walking tractors shall not be less than 55% and 50% respectively, and the transportation operation is the rated load. The field operation average load factor of crawler tractors shall not be less than 60%, and the load factor of forestry logging tractors shall not be less than the rated load. 80% of the disk,
7.3.3.5 When using the test acid (including spleen and performance test) to detect any fault, the time, situation, cause, peak recovery time, etc. shall be recorded in detail, and photos and physical and chemical analysis shall be carried out when necessary. For all faults, their categories shall be determined according to the relevant provisions of Section 4 and recorded in Table A and A8. 7.3.3.6 During the test, the main faults and serious failures found in the mountain must be eliminated before continuing the test. For any major failure caused by non-essential reasons, the standby machine can be used for testing only after approval by the superior competent department. 7.3.4 Test results and report
7.3.4.According to the relevant formula of GB/T387, the total working time, average hourly fuel consumption, average productivity and half-average load factor of each test sample are calculated. The calculation results are recorded in Table A9 and Table A10. The average load factor is calculated by using the measured average hourly fuel consumption and comparing it with the dynamic output shaft variable load test result measured at the beginning of the test piece to obtain the corresponding power output shaft power. 7.3.4.2 Calculate the following indicators in accordance with the provisions of Chapter 4 and record the results in Table A11: a) Average operating time before first failure MTTFF; c) Average failure time between failures MTBF; d) Average downtime time DTMTBF; d) Comprehensive depth of failure without repair performance value (%); 3.4.3 Prepare the test report on the durability of the pulley according to the requirements of the appendix (the appendix mentioned in the notice). See Figure 2 on the report page.
The report should include the following contents:
a) And:
h) The schedule and requirements of the test tasks, the start and end dates of the test and the test location, the responsible unit for the test, etc.!
Main technical specifications of the test tractor
Tractor number, model, overall dimensions (length and width), axle spacing, wheel (track) gauge (front wheel, sprocket wheel), wheel specifications (front wheel, rear wheel, belt width, minimum ground clearance, theoretical speed of each gear, minimum operating weight of the tractor, counterweight weight, engine brand, model, manufacturer, engine rated power, cooling method, starting method, engine and clutch connection type, power output auxiliary type, speed, maximum output rate, fuel type, maximum lifting force d) Test conditions and test situation
At least include the natural characteristics of the test area (topography, soil quality, crops, roads, climate, etc.) and the general situation of the test. ）The test results should include Table A2-Table AS, Table A8, Table AI and Table A1. f) Fault model and its impact analysis List the necessary improvements to explain or analyze. JB/T51082—2000 Appendix A (Reminder Appendix) Test report format Test group number (pulling machine model) Test sheet: Root permission period Figure A! Test report format
JBT51982—2000
【Trailer shape limit piece
2-style test report is compiled after the test in accordance with the test method specified in JB/T51082—2000: Test number
Editor
Test rider
Report review
Report approval
Test unit (good seal)
This report is
A2 test report format
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