GB/T 3871.9-1993 Test methods for agricultural wheeled and tracked tractors Part 9: Traction power test
Some standard content:
UDC531.371 629.114.2
National Standard of the People's Republic of China
GB/T 3871. 1~3871. 1293
Test methods for agricultural wheeled and track tractorsTest methods for agricultural wheeled and track tractors1993-03-03 Issued
1993.10-01 Issued
National Standard of the People's Republic of China
Test methods for agricultural wheeled and track tractorsPart 9 Traction power test
Test nelhods tur uyrirultural wbeeled and tracklaying iractorsPurt 9, Druwbur pawer tests
CB/T 3871.9-93
GL3671—B3
This standard refers to the international standard [89/9-1990 Agricultural tractor test method Part 9 Power test. 1 Main content and applicable range
This standard specifies the test method for determining the performance of agricultural wheeled and belted tractors. It is applicable to agricultural wheeled and belted tractors. 2 Referenced standards
6B2871.1 Agricultural wheeled belt tractor test method Part 1 General requirements 3 Test instruments and equipment and measurement accuracy 3.1 Test instruments and equipment
Mainly include: tension, load, consumption meter, tachometer, counter timer, steel differential gauge, display meter, barometer, hygrometer, tire pressure gauge, or other special instruments and equipment.
3.2 The accuracy of the test data
shall meet the following requirements: tension +0.5%, force +1.0%, reverse base +0.5%, time = 1.2%, conversion ±0.5%, combustion pool ±2.%, combustion temperature ±2.0℃, bulb temperature ±0.5, air bed force +0.2kPa, wheel test air +5.0%. 4 Test items
4.1 The technical condition and test requirements of the tested excavator and puller shall comply with the relevant provisions of GB3871.1. 4.2 The test distance of the wheel reverse puller shall be a submerged, dry, flat concrete or clean surface. The maximum amount of connections are allowed. The attachment coefficient of the rotation rate should not exceed 0B. The test should be carried out on a flat, low-burst, well-performing, evenly compacted soil station or on the test section of the runway. Except for the test track, the slope in any direction shall not exceed 0.5%, and the slope of the road and the burial ground shall not be greater than 1%. The test can also be carried out on a moving surface (such as a drum), and the test results must be comparable with the test results on the above-mentioned road surface. 43. The environmental temperature of the test site should be 20±5:5, and the fuel pressure should not be less than 96.6kPe: 1. If this requirement cannot be met due to restrictions, time is allowed for adjustment of the injection system. Details should be reported to the person in charge. 4.4 All auxiliary equipment that can be disconnected without any tools during normal operation (such as compressor, expander, etc.) that can reduce engine power should be disconnected, otherwise it should be operated at the minimum load. 4.5 The whole tractor under test should be equipped with the large and medium-sized equipment specified in the instruction manual. 4.6 The air supply of the tractor under test should be in accordance with the provisions of the instruction manual and should not overload the wheel. 4.7 The test points can be in the working position specified in the instruction manual and should be kept at the working position during the whole test period. Except for the approval of the State Technical Supervision Commission on March 1993
Implementation on October 1993|| tt||GB/T3871.9-93
Except when driving on rough roads, the traction force should be in the longitudinal center plane of the tractor and parallel to the ground without obvious material 4B During the test, the oil temperature at the cuff of the engine injection should be equal to that of the lubricating oil of the tractor, and the support cover should be limited. 4.9 Except for the test in 5.3, all tests should be carried out with the engine oil fully open. 4,10 When testing on the runway, the measuring time of each measurement should not be less than 2% or the measuring section length should not be less than 2 (the longer time); when testing on the ground on the road, the measuring section length should not be less than 5. Each working condition should be tested once for a round trip, and the average time should be taken.
5 Test method
At the beginning and end of each test, record the air temperature, pressure and humidity. Before the test begins, the traction machine should be driven at a speed of about 3.5km/h for a total distance of 50r1 or the number of wheel revolutions, which will be used as the calculation of the temporary drive wheel speed.
5.1 Maximum power test
5.1.1 The traction machine is put into the test gear, the traction load is increased, and each time it reaches the stable working condition, it passes through the test area alone. The total time of the test cabin is until the engine speed or the drive shaft speed reaches the number of wheel revolutions. Appendix:|| a. The maximum lifting power is obtained. b. The driving wheel rotation rate reaches 15 hours. The traction force of the tractor with a belt of 71 wheels reaches 0.8Z/. (Z. is the static front wheel support reaction force of the tractor, F. is the tractor shaft, and c. is the height from the ground to the production point.
Automatic gear shift occurs in the process:
. Other restricted working conditions specified in the plan, such as transmission fluid slippage exceeding the limit, etc., the tractor should be tested in the traction working gear again: from the maximum traction force of the driving wheel slip rate limit of one wheel type (% for belt type) to the maximum traction force of one wheel type (% for belt type) (7%). When the theoretical running speed does not exceed 1k/h (ratio) or 5km/h, the gear should be tested. The test violates the limits of the test equipment. It should be noted in the report. Consider that the left and right driving wheels of the tractor are not locked together, and the number of revolutions of each driving wheel is measured separately: and the slip rate is calculated separately. If the difference between the average and low speeds exceeds %, the source should be checked and recorded separately. 5.1.2 If the towing machine is equipped with a "locking device" for the transmission (operated by the driver), the traction test should be carried out separately for the six functions. 5.1.3 If the towing machine is equipped with a non-restricted speed, the test should be carried out at six speeds that are averaged and meet the requirements of 5.1.1. This test should be carried out on tractors whose power output shaft cannot transmit all the power. The tractor should exert the maximum traction power, increase the power to reach the rated power, and then further increase the load so that the engine speed reaches about 10% (relative to the rated speed) ) is full, until the power reaches the maximum value, or the limit working condition specified in 1.1 b to 1 (limited to the first type), each additional load condition, record: times 5.1: Series of reference items, 5.3 Five working condition verification
In: the gear closest to 7.5km/h (wheel type) or ekm/h (micro-amplitude type) and the gear with the greatest power, respectively carry out the following working condition tests: Under each working condition. After the load stabilizes, measure and record once each of the vertical numbers listed in 5.1 and 1. a: The maximum power under the rated speed of the engine; b. When the power is 75% of the working condition:
ea% of the working condition;
Shift to a higher gear, reduce the engine speed - make the power even at a low speed. Maintain and b. Product-push: d
is commercial, reduce the engine speed, so that the force and running range are maintained. Working conditions are the same t
C8/T3871.9-93
If the above-mentioned working conditions cannot be achieved, it should be noted in the report. 6 Test results and reports
6.1 The test results are calculated using the following formula. Without changing the atmospheric conditions, other tests need to be carried out to ensure the normal tractor driving speed, km:
- Section length, m
- When the tractor passes through the wind, 5.
b, standard traction power
Where P,-
- Tractor name Water:
Ft tractor traction, kN,
hour fuel consumption of excavator
wherein — fuel consumption of excavator per hour, kg/11D=3.6-SwwW.bzxz.Net
the fuel consumption of tractor during driving. d tractor traction efficiency
wherein the fuel consumption of excavator during driving is kW·tractor driving wheel speed
the center of the formula is
tractor driving wheel speed, t; the average number of tractor driving wheel speeds of 3.5k/h over a distance of GCm, T; the average number of tractor driving wheel speeds over the same distance is (1
6.2. The calculation results of the total power point and other indicators of the industry, the arithmetic mean and value of the five-condition test results, the over-limit power test results and the completion of the test, are recorded in the total table, and the relevant provisions of G, T371.1 are used to compile a single energy test report: Test method. 3
Turbine
Good large concentration power vehicle test
Report limit rate power test
Five-condition test
Test date
CB/T 3871.9—93
Total traction test results
Test lip
Height of traction point from ground m
kPa, E wheel
Each gear slow rate traction rate
Fuel tank
Reverse engine speed
Slippage code
A. The engine speed is close to t.km (wheel type) or 6km/h <belt type>. The engine speed is called the maximum speed when the speed is 5. The traction speed of 5 hours
The fuel slippage rate of 5G%
g'hw·h
Raise one gear·lower the engine speed and keep the same. Increase one gear, reduce the engine speed. Keep the same. The same is true for the industry. The maximum power is generated and the maximum traction is discharged under the condition of traction. The light of traction force under the condition of maximum power is generated and the humidity is adjusted. The special performance of the product under traction force is CB/T 3871.9-93. The engine transfer rate of fuel oil recovery and oil consumption is obtained.
a/hw·h
Raise one finger, make sure to keep the same car gravity and running speed as 1,
c, raise one gear, reduce the excitement analysis selection, maintain the resistance to a detailed rate of gravity and running elasticity when the important notes:
Additional instructions:
This standard is also issued by the Ministry of Electronic Industry of the People's Republic of China, and this international standard is under the jurisdiction of the National Excavator Standardization Technical Committee. The Ministry of Electronic Industry of the People's Republic of China is responsible for the competition, and this standard is required to start from the outstanding people. Lianhua, Da
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