This standard specifies the test site, test method and test results of crawler bulldozer loosening operation. JB/T 7151-1993 Crawler bulldozer loosening operation test method JB/T7151-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7151-93
Crawler bulldozer
Test method for loosening operation
Issued on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Crawler bulldozer
Test method for loosening operation
Subject content and scope of application
This standard specifies the test site, test method and test results of loosening operation of crawler bulldozer. This standard is applicable to the loosening operation performance test of crawler bulldozer equipped with a ripper. 2 Terminology
2.1 Elastic wave
JB/T7151-93
The wave generated when the soil is impacted. There are two types of waves: longitudinal waves and transverse waves. The former is faster than the latter. Elastic waves are also called seismic waves. 2.2 Joints
A fracture structure in which the continuity of rock layers is destroyed and cracks are formed. Test site
3.1 Elastic wave velocity
The relationship between elastic wave velocity and bulldozer power level is shown in Table 1. Table 1
>235~310
>160~235
>120~160
>75~120
3.2 Site slope
The site should be flat, with a longitudinal slope of no more than 0.5% and a transverse slope of no more than 1%. 3.3 Site size
Soil loosening distance
Soil loosening width
Soil pile distance
10m.
The site area should comply with the provisions of Figure 1.
Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
4 Instruments and equipment
JB/T715193
Vibration meter, steel ruler, tape measure, timer, fuel consumption meter, benchmark, tachometer, dry and wet thermometer, etc. 5 Test method
The test items include the site elastic wave velocity, loosening operation and soil dumping operation measurement. The test should be carried out 3 times (of which the loosening preparatory test is only carried out once).
5.1 Elastic wave velocity measurement at the test site
The length of the measuring line is 6m:
The measuring line should be located on a flat ground; the measurement should be carried out at intervals of 1m:
The measuring lines in two mutually perpendicular directions (along the rock joint direction and perpendicular to the joint direction) should be measured: the travel time curve should be drawn to calculate the elastic wave velocity (as shown in Figure 2); the average value, maximum value and minimum value of the elastic wave velocity should be calculated. Time (ma)
Travel (m)
5.2 Soil loosening operation test
5.2.1 Soil loosening preparatory test
Preparatory tests should be carried out to determine the chiseling spacing, loosening method, and number of loosening teeth of the ripper, and the fixing holes for adjusting the length of the loosening tooth rod should be selected. 5.2.1.1 The chiseling spacing of the ripper should be twice the raised ground part (z value) of the chiseling influence area (as shown in Figure 3). 5.2.1.2 If the loosening operation in one direction cannot fully crack the rock, the loosening operation in the cross direction should be carried out. 5.2.1.3 The number of loosening teeth is 1 or 3. The fixing hole for adjusting the length of the loosening tooth rod is selected, and the tooth tip should be replaced with a key block. 2
Ground elevation
Affected area
5.2.2Operation speed
JB/T7151-93
Sales range of loosening machine (2z)
Use the speed of 1 forward gear and 2 reverse gears; if necessary, the speed of 1 forward gear and 1 reverse gear can also be used. 5.2.3 Operation cycle number
The loosening operation is carried out in accordance with the processes 1, 2, 3.. shown in Figure 4. The number of operation cycles is not specified. If the machine cannot go straight and there is an unbroken part due to natural turning during the loosening operation, an additional operation process should be added, as shown by the dotted line (3') in Figure 4
Note that the start and end of each process are based on the start and stop of the crawler. Figure 4
5.2.4 Loosening operation
When the bulldozer starts to loosen and cut the soil, the loosening teeth touch the ground at 0.5m away from the cutting point (as shown in Figure 5), and cut in remotely until the required depth is reached. When the bulldozer reaches the end of cutting, the loosening device should be lifted remotely, and the color surface mark should be
check that the soil is 20m away
while continuing the loosening operation of about 1m. 5.2.5 Measurement items
Number of loosening operation cycles:
JB/T 715193
b. Total time of loosening operation and time of each operation cycle (forward, backward, shifting): c. Fuel consumption,
Note: The total time of loosening operation is the time from the start of loosening to the end of loosening. For bulldozers equipped with torque converters, the measurement of shifting time can be omitted. 5.3 Soil discharge operation test
5.3.1 Soil discharge operation
When the two blade corners of the bulldozer reach the starting point of the loosening operation, the bulldozer performs soil discharge operation in the loosening operation section in the manner of trenching and bulldozing, and piles up the loose soil in the 10m long bulldozing section in sequence (as shown in Figure 6). According to the amount of earthwork to be cracked, the required process (such as sequence number 1 to 7) of soil discharge operation is carried out in sequence with a width of 1 to 3m. 10m
Huai Tu section
5.3.2. Measurement items
Number of earth-discharging operation cycles:
Loosening section
b. Total earth-discharging operation time and the time of each operation cycle (forward, backward, gear shift): 0.5n
c. Fuel consumption.
Note: The total earth-discharging operation time is the time from the start of earth-discharging to the end of earth-discharging. For bulldozers equipped with a torque converter, the measurement of gear shift time can be omitted. 5.4 Earthwork volume measurement
Before the loosening operation test, the test site is leveled and the ground elevation is measured (measured at intervals of 2m). After the loosening operation test, the earth-discharging operation test is carried out and the ground elevation of each measuring point is re-measured. The depth of each measuring point is measured to obtain the average depth, and then the average depth is multiplied by the loosening area (20m×20m) to calculate the volume, see formula (1). V-HX(20X20)
Wherein, V—total earthwork volume, mwwW.bzxz.Net
H—average depth, m.
6 Test results
6.1 Calculation
6.1.1 The amount of loosening and dumping operations per unit time is calculated according to formula (2). Q
JB/T7151-93
The amount of loosening and dumping operations per unit time, m*/h:Wherein, Q…
Total time for loosening operations, h;
Total time for dumping operations, h.
6.1.2 The oil consumption per unit time for soil inspection and dumping operations is calculated according to formula (3): L+L
Wherein, L is the oil consumption per unit time for loosening and dumping operations. L/h; L, oil consumption for loosening operations, L:
L,—oil consumption for dumping operations, L.
6.2 Test report
Enter the test results (average value of 3 tests) into the loosening operation test report (see Table 2). Table 2 Loosening operation test report
Bulldozer model or factory number
Bulldozer blade type
Engine speed when torque converter stalls
Maximum no-load throttle
Number of loosening teeth
Elastic wave speed
Fine ring time
Loosening operation
Draining operation
Cycle time
Shift forward gear
Shift rear gear
Total ring time
Number of cycles
Total operation time T
Fuel consumption L
Fuel consumption per unit time
Operation volume per unit time
Operation volume per unit fuel
Change Forward gear
Change to reverse gear
Total cycle time
Test location
Test date
Driver
Tester
Earth discharge operation
Number of cycles
Total operation time T:
Fuel consumption L
Fuel consumption per unit time
Operation volume per unit time
Operation volume per unit fuel
Total earthwork disk for loosening and earth discharge operation
Operation volume
Earth discharge and earth discharge operation volume per unit time
Fuel consumption for loosening and earth discharge operation per unit time Actual tooth loss of comprehensive block
Additional instructions:
JB/T 7151-93
Table 2 continued
This standard is proposed and managed by Tianjin Engineering Machinery Research Institute, Ministry of Machinery Industry. This standard was drafted by Guanjin Engineering Machinery Research Institute. The main author of this standard is Liu Minxian.
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