This standard specifies laboratory bench test methods for loader working device structural components. This standard applies to structural parts of loader working devices. JB/T 5958-1991 Loader working device fatigue test method JB/T5958-1991 Standard download and decompression password: www.bzxz.net

P97 | | tt | | JB | Published
Published by the Ministry of Mechanical and Electronics Industry of the People's Republic of China
Implemented on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
Fatigue Test Method for Loader Working Devices|| tt||1 Subject matter and scope of application
This standard specifies the laboratory bench test method for the structural components of the loader working device. This standard applies to structural parts of loader working devices. 2 Reference standards
JB3688.2 Technical conditions for tire loaders 3 Definitions
JB/T5958—91
Loader working device fatigue test method: simulated loading on a laboratory bench When the machine is actually operating under external loads, it is a method to inspect the parts where fatigue cracks occur in the structural parts of the working device and measure its fatigue life. 4 Test device
4.1 The connection arrangement of the test device is shown in Figure 1. The test device includes loading equipment, measuring instruments and supporting connectors. 4.2 Loading equipment includes a gantry and a load cylinder. 4.3 The gantry should be firmly fixed on the laboratory foundation platform, and its beams should have sufficient stiffness. The maximum lifting value in the Y-axis direction should be less than 1mm under the static load of 1.4 times the breakout force. 4.4 One end of the loading cylinder is fixed on the gantry, and the other end is fixed on the bucket. The two ends of the oil cylinder are connected to the gantry and bucket using a hinge structure. During the test, the oil cylinder is allowed to rotate around the two hinge points. 4.5 Test device Measuring instruments should be installed on the bucket to measure the load value exerted on the bucket and the number of dynamic load cycles. 4.6 The measurement and recording instruments must be calibrated by the metering department and be within the validity period of the calibration. 4.7 The accuracy of the instrument for measuring load should comply with the requirements in Table 1. Xiquang
Figure 1 Simplified diagram of the connection arrangement of the test device
1-Gantry; 2-Loading cylinder: 3-Basic platform: 4-Front support: 5, etc. Iron rate table: 6- Rear support review: 7 Front frame: 8 - Working device assembly Ministry of Mechanical and Electronics Industry approved on 1991-12-12 for implementation on 1992-07-01
1
Measurement project
static
dynamic
teaching
load
JB/T5958—91
Table 1
fine
maximum teaching load ±2%
degree
maximum teaching load amplitude ±3%
4.8: The work equipment assembly must be installed on the front frame of the whole loader 4.9 Front frame It should be firmly installed on the front and rear supports of the test device. The center height of the front supports of the front frame is equal to the rolling radius of the loader's front tires. The test procedure allows the frame to swing around the center of the front supports in the XOY plane: The height of the two joint points of the rear support of the front truck channel from the ground is the same as the height of the hinge points of the front and rear frames of the loader. The assembly tolerances of the reaming holes and hinge pins are consistent with the actual assembly tolerances of the loader. 4.10 The front and rear supports of the front frame should be firmly fixed on the thin gold platform connected to the laboratory foundation platform, or directly fixed on the laboratory foundation platform. bzxz.net
5 Test method
5.1 Loading method
5.1.1 Load the bucket of the working device according to the load spectrum specified in 5.2. 5.1.2, electro-hydraulic control can be used The hydraulic cylinder can also use a one-way pulse type or other control method to control the bucket. The accuracy of the instruments used to control the loading must meet the requirements of Table 1, and be equipped with a counter to remember the number of cycles. 3. The working frequency of the loading cylinder is in the range of 0.5~5Hz, and .4. the loading waveform is a sine wave.
5.2 Programmed fatigue test load spectrum
5.2.1 Adopt the programmed fatigue test method. The load error shown in Figure 2 is the programmed fatigue test subroutine. In each subroutine, it includes the symmetrical load fatigue test part and the eccentric load fatigue test part. Each subroutine is equivalent to 500 hours of on-site operation; the upper and lower limits and average values ??of the loads quoted in the figure are based on the loader force as 1.0 relative value. The breakout force of the loader is calculated based on the ratio of breakout force (kN) and rated load capacity (t) of 30.0. | |tt | 0.60 | 1:30
1. 20
0. 40
0000
1.25
0
0.30
0, 40 | (Including buckets with bucket teeth and buckets without bucket teeth).
5.2.3 Eccentric load procedure fatigue test
The loading level is 4.
2
JB/T5958-91
The upper and lower limits of the epidemic load amplitude and the number of cycles are shown in Table 2, Table 2
Level
1
2
3
4
different
average teaching recommendation
0.350
0.375
0 . 400
0.425
upper load limit
0.1
0.1
0.1
0.1
lower load limit|| tt||0. 60
0.65
0. 70
0.75
number of cycles
1500
750
625 | | tt | Lower load limit. The number of eccentric load fatigue test cycles is 3500 times on each side, and a total of 7000 times on both sides. The 5.2.5 symmetric teaching load procedure fatigue test
loading level is 6.
The two loading cylinders move synchronously. The upper and lower limits of the fatigue load amplitude and the number of cycles are shown in Table 3. The number of cycles of each subroutine of the symmetrical load fatigue test is 25,000 times in total. Table 3
Slow
2
3
4
5
6
Male
Average Yihe
0.8
0.8
0.8
0. 8
0.8
0.8
Load limit||tt ||1.15
1.20
1. 25
1.30
1.35
1. 40
lower load limit
0. 45
0.40
0.35
0.30
0.25
0. 20
number of cycles
11000|| tt | Repairs and corrections are not possible, but the rigidity of the bucket is allowed to be strengthened. 6 Test results
According to 5.The test load spectrum shall be loaded according to the procedures specified in Article 2 until double cracks appear. The length of the cracks shall be 1 to 2 mm, and the test report shall be filled in in the format of Appendix A. A1 host
model
manufacturer
A2 working device structural parts
manufacturer
structural part number
bucket||tt ||Tie rod
Rocker arm
Motion
A3
Information provided by the host manufacturer
Bucket capacity
(m*)| |tt||Rated load capacity (kN)
Breakout force
A4 conclusion
Working device
Eccentric load
Symmetric load||tt| |Test date:
Test unit:
Test personnel:
(kN)
No.
Test unit owner:
Report date:
Additional notes:
JB/T5958-91
Appendix A
Test report
(reference)
Structure Parts in the
th level
year
month
And return home. This standard was drafted by Tianjin Engineering Machinery Research Institute and Chengdu Engineering Machinery General Factory. The main drafters of this standard are Gao Yuehua, Liu Wei, and Qian Zhengcan. Fatigue cracks occurred at 4
subroutine
.
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