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Machinery Industry Standard of the People's Republic of China
JB/T7153.3-93
Wheeled Bulldozer
Published on November 21, 1993
Type Test Method
Implementation on March 1, 1994
Ministry of Machinery Industry of the People's Republic of China
Main Content and Scope of Application
Cited Standards
General Provisions
Positioning Test
Determination of Performance of Bulldozer
Determination of Passability Index
Braking Performance Test
Maneuverability Test·
Driving Performance Test||tt ||Traction performance test
Running test
Bulldozer operation test
Heat balance test
Visual field measurement
Noise measurement
Exploration test and sewage inspection
Cleanliness measurement
Machine sealing measurement
Industrial test
Technical inspection
Collation of test results
Machinery industry standard of the People's Republic of China
Type test method
Wheel bulldozer
1 Subject content and scope of application
This standard specifies the type test items and test methods for wheel bulldozers. This standard applies to wheel bulldozers above 75kW (hereinafter referred to as bulldozers). 2 Reference standards
GB 8419
Test method and limit for vibration of driver's chair of earth-moving machineryMethod for measuring noise of construction machinery
Test method for field of vision of driver of construction machinery
JB/T7160
3 General provisions
Method for extracting liquid sample from hydraulic oil tank
Microscopic counting method for solid particle dirt in oilJB/T 7153.3-93
3.1 All new products, modified products and old products that have been transferred to another factory or significantly improved should be tested in accordance with this standard before being put into mass production and when the national quality supervision and inspection agency proposes the requirement for type testing. The regular inspection of products can be carried out with reference to this standard. 3.2 Number of bulldozers to be tested
One prototype is provided for type testing, and industrial testing is conducted after all performance tests are completed. 3.3 Preparation before testing
3.3.1 Preparation of technical data
Instruction manual or product manual;
Product standards and acceptance certificates
Performance test reports of engines, torque converters, transmissions, oil pumps and ventilators: actual dimension measurement records of easily worn parts of major parts before assembly; original assembly dimensions and debugging records of major components. 3.3.2
Technical preparation
Check external defects, weld quality, sealing conditions of various hydraulic parts and lubrication conditions of sliding parts; check and calibrate the accuracy of test instruments, meters, gauges and sensors to meet the requirements of technical regulations; c
Verify the maximum idle speed of the engine, the pressure of the hydraulic system safety valve, and the operating air pressure or oil pressure of the brake according to the instruction manual. 3.3.3 Preparation of the test site
3.3.3.1 Positioning test site
Should be a flat, level, hard site, and the ground slope in all directions should not exceed 0.5% within the maximum external dimensions of the bulldozer. 3.3.3.2 Braking performance and dynamic performance test sitea.
Driving and emergency braking test site: should be a flat, level, dry, clean, hard (asphalt or concrete cover) road surface, with a longitudinal slope of no more than 1% and a transverse slope of no more than 3%; parking brake test site: should be a dry, clean concrete road with a slope of 15%;b.
Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994| |tt||JB/T7153.393
The test site for driving performance and traction performance should be a flat, horizontal, hard (asphalt or concrete cover) road surface, with a slope of no more than 0.5% in any direction, a length of no less than 500m, and open at both ends for easy U-turn. d. Deer slope ability test site: The ramp should have a compacted cover layer, a slope angle of about 20°, a total length of more than 3 times the length of the vehicle, and the ramp before the measurement section should be 1.5 times the length of the vehicle body. 3.4 Measurement accuracy requirements
For various direct measurement parameters, if there is no special explanation, the average value of 3 measurements is taken. The measurement accuracy should meet the requirements of Table 1.
Range height and
Length scale
±0.5%±1.5%±5%
3.5 Running-in and acceptance of test bulldozer
Measurement accuracy requirements
Driving wheel
±! *
(±IK)
Fuel consumption
±0.1kp±2%
3.5.1 Before the bulldozer is put into test, it shall be run-in for more than 50 hours in accordance with the provisions of the product manual. After running-in, it shall be maintained in accordance with the provisions and records shall be kept.
3.5.2 The bulldozer shall be inspected and accepted by a unit with certification qualifications according to the factory acceptance technical conditions or relevant documents, and fill in Table 2.
Table 2 Main performance parameters of bulldozer
Model:
Traveling speed
Rated engine power
Maximum traction
Gradability
Overall dimensions
Front and rear wheel track
Vehicle extension
Factory number:
Design value
Hydraulic control
Equipment oil system
Working equipment
Hydraulic system
Bulldozer
4 Positioning test
High deflection
Minimum ground clearance of the whole machine
Weight of the whole machine
JB/T 7153.3--93
Continued Table 2
Red number-diameter×stroke
Rated power
Rated speed
Fuel consumption
Starting mode
Rated pressure
Type
Rated pressure of oil pump
Oil pump displacement
Maximum lifting height
Maximum cutting depth
Maximum tilting height (left, right)
Cutting group
Lifting speed
4.1 Measurement of main geometric parameters
4.1.1 Measurement conditions
The state of the bulldozer is shown in Figure 1.
The tire inflation pressure should reach the specified value in the product manual. 4.1.2 Instruments and equipment
Steel ruler, tape measure, angle gauge, level, plumb line, tire pressure gauge. 4.1.3 Measurement method
Measure according to the items in Table 3.
g/(kw·h)
The bulldozer's main turning angle A and the subframe's lateral swing angle A shall be measured according to Figures 1 and 2 respectively. Design value
4.1.4 Measurement results
The measurement results shall be recorded in Table 3.
JB/T 7153.3—93
Figure 1 Overall measurement diagram
Figure 2 Schematic diagram of lateral swing angle
Model:
Gas:
Tire pressure, left front
Overall dimensions
Distance w,
Body thickness W
JB/T 7153.393
: Main geometric parameters measurement table
Factory number:
Measurement location:
Total length of the whole machine L
Total height of the whole machine H,
Total width of the whole machine WW,
Distance from the frame joint to the front axle L
Maximum deflection angle of the frame A
Minimum ground clearance H:
Rear overhang (rear overhang) L
Commercial angle A
Vice military Transverse swing angle A:
Bulldozer blade height HH,
Bulldozer blade maximum lifting height HH;
Bulldozer blade maximum cutting depth HH,
Bulldozer blade maximum tilt height HH
Bulldozer blade elevation angle AA,
Cutting angle AA
Weight measurement
4.2.1 Measurement conditions
MPa Left rear
MP Right rear
Bulldozer is the weight of the whole machine, and the tire is inflated according to the product manual. 4.2.2 Instruments and equipment
Scale or pressure dynamometer, level, jack, etc. 4.2.3 Measurement method
Measurement date:
Tester:
Measurement value
This standard specifies direct measurement method and indirect measurement method, and the direct measurement method should be used first. 4.2.3.1 Direct measurement method bZxz.net
Use a floor scale or pressure dynamometer.The bulldozer must be located in the middle of the platform (see Figure 3). The bulldozer blade is placed flat on the ground with the driver's cab. The width of the bulldozer blade is measured from the outer edge of the tire to the ground. The bulldozer is used to the center of the rear axle. When using several weighbridges or pressure dynamometers, the tires of the bulldozer should be placed as close as possible to the middle of the weighbridges or pressure dynamometer platforms (see Figure 4). 4.2.3.2 Indirect measurement method JB/T 7153. 3-93 When the bulldozer is too heavy or too large to be directly measured due to the limitations of the equipment, the indirect measurement method can be used. The bulldozer should be placed one bridge at a time on the weighbridge or pressure dynamometer platform. The other bridges should be supported on a hard surface. The bulldozer should be kept horizontal (as shown in Figure 5), and the loads of the front and rear axles of the bulldozer should be measured respectively. The total weight is the sum of the measured values of the two axles. Figure 5
When using several floor scales or pressure dynamometers, they should be placed at the tire support center respectively, and the bulldozer should be kept horizontal at the same time. The total weight is the sum of the measured values of the four support points.
4.2.4 Measurement results
The test result should be the arithmetic mean of 3 measurements, that is, the whole machine weight G of the bulldozer, which is recorded in Table 4. 4.3 Bridge load distribution rate
4.3.1 Measurement conditions
When the bulldozer is at the whole machine weight and the frame is straight, place the bulldozer board in the transport position. 6
4.3.2 Instruments and equipment
Compression or tension dynamometer.
4.3.3 Test method
JB/T-7153.3—93
Measure the load and static radius of the front and rear axles and each wheel respectively. When measuring, put the control rod in the middle position and release the brakes of the wheels. If the sum of the loads of the front and rear axles is different from the weight of the whole machine, the weight of the whole machine shall prevail, and the error shall be shared by the front and rear axles according to the weight ratio. 4.3.4 Test results
Measure 3 times and take the average value and record it in Table 4.
Table 4 Weight and axle load distribution measurement table
Model:
Air:
Front axle load
·Axle load distribution
Weight of the whole machine kg
Rear axle load kg
Static force ratio of tires
4.4 Determination of center of gravity position
Determination conditions
Weight of the whole machine for bulldozer:
Measurement date:
Measurement location:
The bulldozer is lowered as far as possible to a position slightly away from the horizontal reference plane; the frame is kept straight and locked.
Instruments and equipment
Tension dynamometer, lifting equipment, plumb line, square, level, etc. Determination method
4.4.3.1After the static load of each wheel is measured, calculate according to formula (1) and formula (2). Horizontal ordinate (see Figure 6)
Where: G is the total load of the left and right rear wheels of the bulldozer. NL—-wheelbase of the bulldozer, mm;
G—the weight of the bulldozer, kg.
Horizontal abscissa (see Figure 7)
Production number:
Tester:
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