Method for testing indoor durability of tire of mining dump truck

Abstract

The invention discloses a method for testing the indoor durability of a tire of a mining dump truck, and relates to the technical field of tires. According to the technical scheme, the method comprises the following steps: inflating a tire to enable the inflating pressure to reach 1200-1300kPa; the surface of the rotary drum is provided with a bulge of which the transverse width is greater than the width of a tire tread, and the temperature of the rotary drum is 60-70 DEG C during testing; and mounting the combination of the tire and the rim on a rotary drum testing machine for testing. According to the invention, indoor simulation is carried out by optimizing test conditions, so that the failure condition of the tire after indoor durability test is consistent with the failure condition of the tire in field use, the product research and development success rate is improved, the research and development test period is shortened, the field test cost is reduced, and the method has important significance on research and development guidance of tire products.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to an indoor durability performance testing method for a mining dump truck tire. Background Art

[0002] The existing indoor tire durability test method is to give the tire a fixed inflation pressure, gradually increase the load with the running time, and run it on a smooth drum at a constant test speed until the tire fails. However, the use conditions of mining dump truck tires are harsh. The uneven road surface, high load capacity, large speed difference between empty and loaded, and many turns greatly affect the service life of the tire. The existing indoor tire test conditions are very different from the actual tire use conditions, resulting in inconsistencies between the indoor tire durability test results and the tire failure results during actual use. For example: 1) The inflation pressure of the existing indoor durability test is 650-750kPa, while the actual inflation pressure is generally about 2 times the indoor inflation pressure. The inflation pressure difference is large and cannot reflect the stress changes of the tire under high pressure; 2) The existing indoor durability test is based on the standard load m (unit: kg), and the actual load of the tire under heavy load is about 2m (unit: kg), which cannot reflect the deformation of the tire rubber and steel wire under actual heavy load; 3) In actual use, the road surface is bumpy and uneven, which causes the tire to be instantly overloaded and subjected to large stress. The existing indoor durability test is run on a smooth drum. , unable to simulate complex road conditions, is one of the important reasons for the inconsistency between indoor test failure results and actual use failure results; 4) The running speed of the existing indoor durability performance test is relatively stable, which is inconsistent with the situation in actual use due to the influence of no-load, heavy-load reciprocating operation and uphill and downhill conditions; 5) The default drum temperature in the existing indoor test is 38°C, which is very different from the highest surface temperature of 65°C in summer during actual use, and it is impossible to test the impact of high temperature itself on tire performance; 6) Mine roads frequently turn, and the existing indoor durability performance test method cannot characterize the impact of turning on tire performance.

[0003] Tires are generally made up of four layers of belt plies. During indoor durability performance tests, the damage point is generally at the end point of the 1# or 2# belt layer, while during actual use, the damage point of the tire is generally at the end point of the 3# belt layer. Therefore, the existing indoor tire durability performance test method has little guiding significance for improving tire product research and development. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide an indoor durability performance test method for mining dump truck tires, to optimize the test conditions for indoor simulation so that the failure symptoms of the tires after the indoor durability performance test are consistent with the failure symptoms of the tires during field use, thereby improving the success rate of product research and development, shortening the research and development test cycle, and reducing the cost of field testing, which is of great significance for guiding the research and development of tire products.

[0005] The technical solution of the present invention is:

[0006] The indoor durability test method of the tire for mining dump truck is to inflate the tire to a pressure of 1200-1300 kPa; a bulge with a lateral width greater than the width of the tire running surface is set on the drum surface, and the drum temperature is 60-70 ° C during the test; the combination of the tire and the rim is installed on the drum tester, and the test process is as follows:

[0007] In the initial test stage S1, a standard load m is first applied to the tire, the test speed is V1, and the sidewall angle α = 0°;

[0008] After the initial test phase of S2 is completed, the cycle test phase begins until the tire is damaged; each cycle test includes the following four phases:

[0009] S21 applies a standard load m to the tire, the test speed is V2, and the sidewall angle α = 0°;

[0010] S22 applies a standard load m to the tire, the test speed is V2, and the sidewall angle α>0°;

[0011] S23 applies 2 times the standard load to the tire for 2m, the test speed is V1, and the sidewall angle α = 0°;

[0012] S24 applies 2 times the standard load to the tire for 2m, the test speed is V1, and the sidewall angle α>0°;

[0013] Where V1<V2.

[0014] Preferably, V1 = 7-13 km / h, V2 = 45-55 km / h.

[0015] Preferably, in step S1, the test time is 1.9-2.1 hours.

[0016] Preferably, in step S21, the test time is 0.37-0.43h.

[0017] Preferably, in step S22, the test time is 0.07-0.13h.

[0018] Preferably, in step S23, the test time is 1.4-1.6 hours.

[0019] Preferably, in step S24, the test time is 0.47-0.53 h.

[0020] Preferably, in steps S22 and S24, the sidewall angle α=2.5°-3.5°.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The test method of the present invention includes instantaneous overload: a boss is added to the drum to simulate the bumpy road conditions during actual use, and the height of the boss can be adjusted according to the degree of potholes during actual use to simulate an instantaneous overload situation; during the test, the test speeds are different when empty and loaded to simulate the different empty and loaded speeds when transporting materials back and forth during actual use; the tire inflation pressure is 1100-1250kPa, which is consistent with the tire inflation pressure during actual use to better simulate the actual use scenario; tires are usually damaged when overloaded during actual use, so the present invention sets the load to a heavy load of 2m when testing durability indoors; the present invention sets the test temperature to 65°C to be closer to the surface temperature of some working conditions in the high temperature season in summer; the sidewall angle α is set at different test stages to simulate the uneven lateral force caused by the turning process of the tire during actual use. The present invention fully considers the influencing factors when the tire is running under adverse working conditions such as high pressure, high load, speed change, bumpy road, and multiple turns, and optimizes the test conditions for indoor simulation, so that the failure symptoms of the tire after the indoor durability performance test are consistent with the failure symptoms of the tire in field use, thereby improving the success rate of product research and development, shortening the research and development test cycle, and reducing the cost of field testing, which is of great significance for guiding the research and development of tire products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a rotary drum provided with protrusions in the present invention.

[0024] Figure 2 It is a schematic diagram of the tire sidewall angle α in the present invention.

[0025] In the figure, 1, drum; 2, bulge; 3, tire. DETAILED DESCRIPTION

[0026] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0027] Example 1

[0028] In the indoor durability test method of the mining dump truck tire of this embodiment, the tire 3 is inflated to a pressure of 1250 kPa; a protrusion 2 (such as Figure 1 The temperature of the drum 1 during the test is 65°C; the combination of the tire 3 and the rim is installed on the drum 1 test machine, and the test process is shown in Table 1:

[0029] In the initial test stage S1, a standard load m is first applied to the tire 3, the test speed is 10 km / h, and the sidewall angle α is 0° (the sidewall angle is the angle of deflection of the tire 3 when it approaches the drum, so as to simulate the turning process of the tire 3 in actual use, such as Figure 2 shown);

[0030] After the initial test phase of S2 is completed, the cycle test phase begins until the tire 3 is damaged; each cycle test includes the following four phases:

[0031] S21 applies a standard load m to tire 3, the test speed is 50 km / h, and the sidewall angle α=0°;

[0032] S22 applies a standard load m to tire 3, the test speed is 50 km / h, and the sidewall angle α=3°;

[0033] S23 applies twice the standard load of 2m to tire 3, the test speed is 10km / h, and the sidewall angle α=0°;

[0034] S24 applies twice the standard load of 2m to the tire 3, the test speed is 10km / h, and the sidewall angle α=3°.

[0035] Table 1

[0036]

[0037] Example 2

[0038] The test method of Example 2 is the same as that of Example 1, and the differences are shown in Table 2:

[0039] Table 2

[0040]

[0041]

[0042] Example 3

[0043] The test method of Example 3 is the same as that of Example 1, and the differences are shown in Table 3:

[0044] Table 3

[0045]

[0046]

[0047] Comparative Example 1

[0048] The test method of Comparative Example 1 is the same as that of Example 1, except that the inflation pressure of the tire 3 of Comparative Example 1 is 650 kPa, 800 kPa, and 950 kPa.

[0049] Comparative Example 2

[0050] The test method of Comparative Example 2 is the same as that of Example 1, except that the load rates of Comparative Example 2 are 50%, 100%, and 150%.

[0051] Comparative Example 3

[0052] The test method of Comparative Example 3 is the same as that of Example 1, except that: the surface of the drum 1 of Comparative Example 3 has no protrusions 2 and its surface is smooth.

[0053] Comparative Example 4

[0054] The test method of Comparative Example 4 is the same as that of Example 1, except that the test speed of each test stage in Comparative Example 4 is 30 km / h.

[0055] Comparative Example 5

[0056] The test method of Comparative Example 5 is the same as that of Example 1, except that: in the test of Comparative Example 5, the sidewall angle α=0°.

[0057] Comparative Example 6

[0058] The test method of Comparative Example 6 is the same as that of Example 1, except that the temperature of the drum 1 of Comparative Example 6 is 38°C.

[0059] Comparative Example 7

[0060] The test process of Comparative Example 7 is shown in Table 4:

[0061] Table 4

[0062]

[0063] According to the test method of Examples 1-3, the failure starting point of the tire 3 is at the end point of the 3# belt layer, which is consistent with the failure symptoms of the tire 3 in actual use, while in the test method of Comparative Examples 1-7, the failure starting point of the tire 3 is at the end point of the 1# or 2# belt layer. It can be seen that the indoor durability performance test method of the present invention solves the problem that the failure symptoms of the tire 3 measured by the existing test method are inconsistent with the failure symptoms in actual use, and provides an important verification method for subsequent product development and improvement.

Claims

1. The indoor durability performance test method of mining dump truck tires is characterized by: The tire (3) is inflated to a pressure of 1200-1300 kPa; a protrusion (2) having a lateral width greater than the width of the tire running surface is provided on the surface of the drum (1); during the test, the temperature of the drum (1) is 60-70° C.; the assembly of the tire (3) and the wheel rim is mounted on the drum (1) test machine, and the test process is as follows: In the initial test stage S1, a standard load m is first applied to the tire, the test speed is V1, and the sidewall angle α = 0°; After the initial test phase S2 is completed, the cycle test phase begins until the tire (3) is damaged; each cycle test includes the following four phases: S21 applies a standard load m to the tire (3), the test speed is V2, and the sidewall angle α=0°; S22 applies a standard load m to the tire (3), the test speed is V2, and the sidewall angle α is greater than 0°; S23: applying twice the standard load of 2 m to the tire (3), the test speed is V1, and the sidewall angle α=0°; S24: applying twice the standard load of 2 m to the tire (3), the test speed is V1, and the sidewall angle α is greater than 0°; Where V1<V2.

2. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: V1=7-13km / h, V2=45-55km / h.

3. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In step S1, the test time is 1.9-2.1h.

4. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In step S21, the test time is 0.37-0.43h.

5. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In step S22, the test time is 0.07-0.13h.

6. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In step S23, the test time is 1.4-1.6 hours.

7. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In step S24, the test time is 0.47-0.53h.

8. The indoor durability performance testing method of a mining dump truck tire according to claim 1, characterized in that: In steps S22 and S24, the sidewall angle α=2.5°-3.5°.

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