GB/T 3871.4-1993 Test methods for agricultural wheeled and crawler tractors Part 4: Hydraulic lifting capacity and output power test GB/T3871.4-1993 Standard download decompression password: www.bzxz.net

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 tractorsPublished on 1993-03-03
Published on 1993.10-01
National Standard of the People's Republic of China
Test methods for agricultural wheeled and track tractors-Part 4 Hydraulle llftlng capacity and output power testG4/F 3371.4-93
This standard is based on the international standard ISO789/3-1183 Test methods for agricultural tractors Part 2: Hydraulic power and loss
1 Subject and scope of application
This standard specifies the test method for the hydraulic lifting power and the average power of standard and standard crawler tractors. This standard is applicable to agricultural wheeled tractors and crawler tractors. 2 Referenced standards
G119.1 Three-point total stop for agricultural wheeled tractors Part 1: Classes 1, 2, and 3 G11593.2 One-point suspension for agricultural wheeled tractors Part 1: Class IV G11595.3 Three-point total stop for agricultural wheeled tractors Part 3: Class IV/3871.1 Test methods for agricultural wheeled tractors Part 1 General requirements
3 Test instruments and equipment and test equipment 3.1 The test equipment includes load cell, dynamometer, special rack, pressure gauge, flow meter, tachometer, time meter, sensor meter, digital meter, seat meter, etc. 3.2 The test standard is as follows: distance height ±05%, force ±1.0, mass = 0.05%, flow rate ±1.0%, K force +2.05%, time can be U.2% higher than the reverse three n. Three temperature ranges (and angle height 1.0). %4 Test conditions
4.1 The technical recovery and test requirements of the type of machine to be tested are applicable to the requirements of 3871.1. 4.2 The front and rear axles of the tractor shall be supported on rigid support to eliminate the influence of deformation of the obstacle system, and the tractor shall be placed in a horizontal position; the front plate shall be placed on the ground to ensure the safety of the mine. 4.3 The lifting levers shall meet the requirements of G15S3.: 1593.2 and 1593.5. However, if the lifting levers meet the requirements, they shall be tested as much as possible under the conditions of operation required. And explain it in the approval document. 4.4 The internal dimensions of the special frame used for the test shall be the same as those specified in G1:S3.1G:53.3 and H1593.3. The center of mass of the support shall be on a straight line between the midpoint of the line connecting the two lower hanging points and the vertical support, 6mm above the lower hanging point. The actual vertical height is N, and the span between the lower holding points is N. If the test load carrier is more than one type, the most suitable one should be the National Technical Supervision Bureau. Approved on March 3, 1993 and implemented on October 1, 1993.
GR/T 3871.4—93
Monthly standard categories that are compatible with the traction rate of the machine are used for testing.
Standard material quantity
Figure: Special frame diagram
4.5 When the upper puller has more than one pull rod and lifting fiber connection point, the rate shall be determined by the manufacturer and the test point. 4.6 Generally! The safety return pressure of the system shall be consistent with the provisions of the fast month. If it does not meet the requirements, it shall be adjusted and the situation shall be recorded and reported
1. Except for the adjustment of the net superiority trap, all tests are carried out at the rated speed of the machine. 4.6 Abandoned test questions at the beginning of the filter pressure tank In the first oil temperature, if the system itself is limited by the structure and cannot reach the final range, the system should pay attention to the period of time. 4.3 During the sedimentation test, if there is a filter card or a fuel injection device in the decompression system, the test should be carried out without opening it. 4.0 The ambient temperature during the static sedimentation test is 23 ± 7:4.1 The basic pressure gauge should be charged at the hydraulic system safety reading of the impact machine. During the pressure test, the pressure output sound of the bed should be installed at the joint of the heat pump box. 5. In addition to the 1st test method, the oil channel of the bed system should be measured at the beginning of each test. 5.1 The safety test of the mechanism is to measure the expansion of the test traction safety gauge at the end, measure the length and width of the test state card in the plane, and measure the total carbon flow chart and table of the test items. The coordinates of the relevant points on the body of the machine can be obtained from the above reference. 5.2 Maximum force test
5.2.1 Test at the total point
4 The entire lifting stroke of the hanging point is divided into at least six points (including the lowest point of the line and the points at the upper end point where it is possible for two people to test. The climbing points are set at the points, and the vertical load is added to the left to meet the midpoint of the lower hanging point. Then move the hanging control handle to the left to meet the maximum lifting force of the safety valve at the two lowest points and the height of the loading point from the ground. The ratio is the maximum lifting force of the core point. According to this method, the maximum lifting force at each point is calculated in turn.
The minimum of the three forces of the safety valve specified in the instruction manual is used as the maximum lifting force of the whole column. 18
5.2 .2 Test on the special annual rate
GI/T3871.4—53
After dragging and expanding the special frame set by the 341 series, the entire upper pull rod should be lifted as far as possible to restore the efficiency to the highest vertical position. The vertical position should be noted in the report. Apply the load at the center of mass of the frame, as in the 2.1 series test, measure the lifting force at the sub-point, and then correct it to the lifting force.
5.3 Lifting time The lifting longitudinal force is measured under the conditions of the 2 test, and the load is converted into the full stroke. The lifting time and the vertical stroke from the low point to the point of the lifting hole are recorded on the small measuring plate. Repeat the test once, and take the average value according to the lifting time. It refers to the time from the beginning of the operation to the time when the lifting is reduced. The lifting hand operation force should be the maximum longitudinal force in the direction of the maximum force, and it should be repeated three times. Take the average 5.4 net settlement test
and conduct it on the special distance frame immediately after 5.3 system, and the result is the minimum differential force for the whole operation. Raise the load to the total height and then the engine will start to fire. At the same time, measure the height of the loading point. At this time, measure the height of the loading point again. The difference between the previous measured values ​​and the height of the loading point will be the static settlement value for that period. 5.5 Liquid positive screening power test
Connect the vertical liquid layer transmission point with the unified measuring device, throttle valve and other measuring lines. At the beginning of the test, put the operator at the average position, measure the pressure of the line during the period, and measure it after each part is moved to a certain position. Record the following points: section hydraulic power point, special brush minimum set pressure point and maximum flow point. In addition, there is also a case with uncompensated layer. In the system, the "standby" state of the system should also be recorded! Force, the work is not stated in the manual to cause the number of compensation, lift in the report, 6 test results and report
6.1 The measured maximum lift force of each point is the minimum value in the following formula, and the whole system is obtained: F...-0.91
The maximum lift force of each point is kN
F: The minimum lift force of each point is kN\--the measured safety valve set pressure".MPu: Use the minimum safety set pressure specified in the manual, MP=Under the action of the maximum lift force of the stroke version, the moment of the towing machine rear axle is calculated by the following formula: =F
Max., the towing machine road wheel auxiliary force k·m,...The distance m from the horizontal holding or pressure point to the water center of the bottle pulling machine axle. 6.2 When calculating the test results of the five items, assume that the output power is: Q——output flow rate, .MPa
6.3 The test conditions (including the performance of the machine, the average position and the efficiency of the station) are recorded in the summary table, and the single item energy acceptance report is completed according to GB387]1.2
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CA/T 3871.4-93
Power extraction shaft cheating head
Note these items daily general drawings
All hanging system position measurement results table
This standard is issued by the People's Republic of China Machinery and Electronics Industry Decoration Card Standard by the National Standard Control Yangbei Technical Committee, this standard is issued by the Machinery Industry Bureau, this standard is drafted by Qian Jin, please note. mn
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