Tire friction force testing equipment

Abstract

The utility model discloses tire friction force testing equipment, which comprises a machine base, a floor placement clamp, a tire mounting mechanism and a pulling mechanism are arranged on the machine base, a plate to be tested is detachably arranged on the floor placement clamp, a tire to be tested is detachably arranged on the tire mounting mechanism, and the pulling mechanism is arranged on the machine base. A tire on the tire mounting mechanism can be connected with a plate on the floor placement fixture, a counterweight assembly is arranged on the tire mounting mechanism and is used for placing a counterweight block, a tension meter is arranged at the output end of the pulling mechanism, the test end of the tension meter is connected with the tire mounting mechanism, and the test end of the tension meter is connected with the plate on the floor placement fixture. And the pulling mechanism is used for driving the tire mounting mechanism to horizontally move so as to drive the tire to slide on the plate. According to the utility model, the real friction coefficient of the tire can be directly obtained, the friction coefficient test requirements of different tires on different floors can be met, and the universality of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of friction testing equipment, specifically to a tire friction testing device. Background Technology

[0002] Intelligent robots, as a technology encompassing a considerable number of disciplines, emerged almost simultaneously with artificial intelligence. They are becoming increasingly important in today's society, with more and more fields and jobs requiring their participation, leading to increasingly frequent research into intelligent robots. As intelligent robot technology continues to develop and mature, they will enter every household, better serving people's lives and making them more comfortable and healthy.

[0003] Tires are a crucial component for the locomotion of intelligent robots, and whether they slip directly impacts the robot's ability to move. Obtaining the coefficient of friction of the tires on a given surface determines whether the robot can move freely on that surface. Current technology lacks equipment for on-site testing of tire friction; typically, the coefficient of friction of the tire material is used as the tire's coefficient of friction. However, the coefficient of friction of the tire material inevitably deviates from the actual coefficient of friction of the tire, which can cause the intelligent robot to slip and become unable to move on certain surfaces. Therefore, before assembling the tire onto the robot, it is necessary to know the coefficient of friction of the tire on various surfaces. The formula for calculating the coefficient of friction is f = μN, where f is the frictional force, μ is the coefficient of friction, and N is the normal force on the contact surface. Therefore, obtaining the coefficient of friction requires testing the tire's frictional force on various surfaces to calculate the coefficient of friction on different surfaces. Thus, there is an urgent need for a device capable of on-site testing of tire friction to obtain the coefficient of friction of the tire on a given surface. Utility Model Content

[0004] To address some or all of the problems existing in the prior art, this utility model provides a tire friction testing device, including a base. The base is equipped with a floor mounting fixture, a tire mounting mechanism, and a pulling mechanism. The floor mounting fixture has a detachable plate to be tested, and the tire mounting mechanism has a detachable tire to be tested. The tire on the tire mounting mechanism can contact the plate on the floor mounting fixture. The tire mounting mechanism has a counterweight assembly for placing counterweight blocks. The output end of the pulling mechanism is equipped with a force gauge, and the test end of the force gauge is connected to the tire mounting mechanism. The pulling mechanism is used to drive the tire mounting mechanism to move horizontally, thereby causing the tire to slide on the plate.

[0005] As a further improvement of this utility model, the tire mounting mechanism includes a mounting base, which is slidably connected to the base. The counterweight assembly is connected to the upper end of the mounting base, the test end of the tension gauge is connected to the mounting base, and the lower end of the mounting base is provided with a mounting bracket. The tire to be tested is detachably connected to the mounting bracket.

[0006] As a further improvement of this utility model, the counterweight assembly includes a counterweight plate, which is connected to the mounting base and is used to place counterweights.

[0007] As a further improvement of this utility model, a weight limiting rod is provided at the center of the counterweight plate, and the counterweight is placed on the counterweight plate after passing through the weight limiting rod.

[0008] As a further improvement of this utility model, the pulling mechanism includes a pulling motor, which is connected to the base. A pulling screw is provided on the output end of the pulling motor. The pulling screw is rotatably connected to the base. A pulling slider is sleeved on the pulling screw. The pulling motor can drive the pulling slider to slide on the pulling screw. The force gauge is connected to the pulling slider.

[0009] As a further improvement of this utility model, two sliding guide rails are arranged in parallel on the base, and the pull slider and the mounting base are respectively slidably engaged with the sliding guide rails.

[0010] As a further improvement of this utility model, a travel limit block is provided on the side of the base away from the pulling motor, and the mounting seat can be connected to the travel limit block. The travel limit block is used to limit the sliding stroke of the mounting seat.

[0011] As a further improvement of this utility model, the floor mounting fixture includes a limiting frame, which is used to limit the board to be tested. The limiting frame is provided with a plurality of board fixing blocks, which are detachably connected to the limiting frame and can abut against the board to be tested inside the limiting frame.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention uses a pulling mechanism to drive a tire to slide on a board, allowing a force gauge to obtain the frictional force between the tire and the board. Combined with the weight of the counterweight on the tire mounting mechanism, the coefficient of friction of the tire on the board can be calculated using a formula. The board and floor mounting fixture are detachable, as are the tire and tire mounting mechanism, enabling this invention to meet the friction coefficient testing needs of different tires on different floor surfaces, thus improving the equipment's versatility. This invention can directly obtain the true coefficient of friction of the tire, ensuring the robot can move freely on various floor surfaces, reducing slippage due to insufficient friction, and improving the robot's operational stability. Attached Figure Description

[0014] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a front view structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a top view of an embodiment of the present invention. Detailed Implementation

[0017] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0018] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] like Figure 1-2 As shown, a tire friction testing device includes a base 1, on which a floor mounting fixture, a tire mounting mechanism, and a pulling mechanism are fixedly mounted. A plate 100 to be tested is detachably mounted on the floor mounting fixture, and a tire 200 to be tested is detachably mounted on the tire mounting mechanism. The tire 200 on the tire mounting mechanism can connect with the plate 100 on the floor mounting fixture. The tire mounting mechanism is provided with a counterweight assembly for placing a counterweight 300. A force gauge 2 is provided at the output end of the pulling mechanism. The test end of the force gauge 2 is connected to the tire mounting mechanism. The pulling mechanism is used to drive the tire mounting mechanism to move horizontally, thereby causing the tire 200 to slide on the plate 100.

[0021] During the test, the plate 100 to be tested is first installed onto the floor mounting fixture, and the tire 200 to be tested is installed onto the tire mounting mechanism. At the same time, a suitable counterweight 300 is placed on the counterweight assembly. Then, the tire mounting mechanism is pulled horizontally at a constant speed by the pulling mechanism, thereby pulling the tire 200 to slide at a constant speed on the plate 100. At this time, the value displayed on the force gauge 2 is the frictional force between the tire 200 and the plate 100 to be tested. Then, the coefficient of friction between the tire 200 and the plate 100 to be tested can be calculated by the formula.

[0022] For example, in a certain test, the following values ​​were obtained: the weight of the counterweight was 1 kg, and when the pulling mechanism pulled the tire to slide at a constant speed, the force gauge showed a value of 7.8 N. According to the formula f = μN, where f is the frictional force, μ is the coefficient of friction, and N is the normal force on the contact surface, N = weight of the counterweight * gravitational acceleration = 9.8 N. Therefore, the coefficient of friction between the tire and the plate in this test can be calculated as μ = 7.8 / 9.8 ≈ 0.8.

[0023] In this tire friction testing equipment, the plate 100 and the floor mounting fixture are detachably installed, and the tire 200 and the tire mounting mechanism are also detachably installed. This allows it to meet the friction coefficient testing requirements of different tires 200 on different floor surfaces, improving the equipment's versatility. This tire friction testing equipment can directly obtain the true friction coefficient of the tire 200, ensuring that the robot can move freely on various floor surfaces, reducing the problem of slipping and being unable to move due to insufficient friction, and improving the stability of the robot's operation.

[0024] The floor mounting fixture includes a limiting frame 3, which is fixedly mounted on the base 1. The limiting frame 3 is used to limit the board 100 to be tested. The limiting frame 3 has multiple board fixing blocks 4, which are detachably connected to the limiting frame 3 and can abut against the board 100 to be tested within the limiting frame 3. When installing the board 100 to be tested, the board fixing blocks 4 are first removed, then the board 100 to be tested is placed into the limiting frame 3, and then each board fixing block 4 is reinstalled into the limiting frame 3, so that each board fixing block 4 abuts against the board 100 within the limiting frame 3. This secures the board 100 to be tested within the limiting frame 3 by using multiple board fixing blocks 4, preventing the board 100 from shifting during testing and improving the stability of the test.

[0025] The tire mounting mechanism includes a mounting base 5, which is slidably connected to the base 1. A counterweight assembly is mounted on the upper end of the mounting base 5. The test end of the force gauge 2 is fixedly connected to the mounting base 5. A mounting frame 6 is fixedly installed on the lower end of the mounting base 5. The mounting frame 6 is used to mount the tire 200 to be tested, and the tire 200 to be tested can be detachably connected to the mounting frame 6. During testing, the tire 200 is mounted on the mounting frame 6, and the counterweight 300 is placed on the counterweight assembly. The pulling mechanism can pull the mounting base 5 to slide on the base 1, thereby causing the tire 200 to slide on the plate 100. The friction force of the tire 200 is then obtained through the force gauge 2.

[0026] The counterweight assembly includes a counterweight plate 7, which is fixedly connected to the mounting base 5. The counterweight plate 7 is used to hold the counterweight 300. In this embodiment, a weight limiting rod 8 is provided at the center of the counterweight plate 7. In use, the counterweight 300 is placed on the counterweight plate 7 after passing through the weight limiting rod 8. The weight limiting rod 8 is used to limit the counterweight 300 on the counterweight plate 7 to prevent the counterweight 300 from shifting and affecting the test.

[0027] The pulling mechanism includes a pulling motor 9, which is fixedly mounted on the base 1. A pulling screw 10 is provided at the output end of the pulling motor 9, and the pulling screw 10 is rotatably and limitably connected to the base 1. A pulling slider 11 is sleeved on the pulling screw 10. The pulling motor 9 can drive the pulling slider 11 to slide on the pulling screw 10. A force gauge 2 is fixedly mounted on the pulling slider 11. During the test, the pulling motor 9 drives the pulling screw 10 to rotate, which in turn drives the pulling slider 11 to slide on the pulling screw 10. The pulling slider 11 moves the force gauge 2, thereby pulling or pushing the mounting base 5, causing the tire 200 on the mounting frame 6 to slide on the plate 100 to be tested.

[0028] To limit and guide the movement direction of the mounting base 5 and the pulling slider 11, two parallel sliding guide rails 12 are arranged on the base 1. The pulling slider 11 and the mounting base 5 are respectively slidably engaged with the sliding guide rails 12. When the pulling motor 9 is working, it can drive the pulling slider 11 to slide on the sliding guide rails 12, thereby pushing or pulling the mounting base 5 to slide on the sliding guide rails 12. The sliding guide rails 12 limit and guide the movement direction of the mounting base 5, ensuring that the tire 200 can slide horizontally on the plate 100, thus ensuring the stability of the test.

[0029] A travel limit block 13 is provided on the side of the base 1 away from the pull motor 9. When the pull motor 9 drives the force gauge 2 to push the mounting seat 5 to its limit position, the mounting seat 5 will engage with the travel limit block 13. At this time, the mounting seat 5 is restricted by the travel limit block 13 and cannot move further. The travel limit block 13 is used to limit the sliding stroke of the mounting seat 5. By limiting the sliding stroke of the mounting seat 5 by the travel limit block 13, the problem of the mounting seat 5 falling off the sliding guide rail 12 during the sliding process is prevented, thus improving the stability of the structure.

[0030] Working principle:

[0031] When testing the friction of tire 200, first install the tire 200 to be tested onto the mounting bracket 6, then install the plate 100 to be tested into the limiting frame 3 and fix it with the plate fixing block 4; then place a suitable counterweight 300 onto the counterweight plate 7. Next, control the operation of the pulling motor 9, which drives the pulling screw 10 to rotate. The rotation of the pulling screw 10 drives the pulling slider 11 to slide horizontally on the sliding guide rail 12. The pulling slider 11 drives the force gauge 2 to move synchronously, thereby pulling or pushing the mounting base 5 to slide on the sliding guide rail 12, causing the tire 200 on the mounting bracket 6 to slide on the plate 100 to be tested. When the force gauge 2 pushes or pulls the mounting base 5 at a constant speed, the friction between the tire 200 and the plate 100 can be obtained by recording the test value on the force gauge 2, thus obtaining the corresponding coefficient of friction.

[0032] If it is necessary to test the friction of tire 200 on different plates 100, simply replace the plate 100 inside the limit frame 3 and then repeat the above test process.

[0033] Similarly, if you want to test the friction of different tires 200, you need to replace the tires 200 on the mounting bracket 6 and repeat the above test process.

[0034] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A tire friction force testing device, characterized in that: The device includes a base, on which are mounted a floor mounting fixture, a tire mounting mechanism, and a pulling mechanism. The floor mounting fixture has a detachable plate to be tested, and the tire mounting mechanism has a detachable tire to be tested. The tire on the tire mounting mechanism can contact the plate on the floor mounting fixture. The tire mounting mechanism has a counterweight assembly for holding counterweight blocks. The output end of the pulling mechanism has a force gauge, and the test end of the force gauge is connected to the tire mounting mechanism. The pulling mechanism drives the tire mounting mechanism to move horizontally, thereby causing the tire to slide on the plate.

2. The tire friction testing equipment according to claim 1, characterized in that: The tire mounting mechanism includes a mounting base that is slidably connected to the base, a counterweight assembly that is connected to the upper end of the mounting base, a test end of the tension gauge that is connected to the mounting base, and a mounting bracket that is provided at the lower end of the mounting base. The tire to be tested is detachably connected to the mounting bracket.

3. The tire friction testing equipment according to claim 2, characterized in that: The counterweight assembly includes a counterweight plate, which is connected to the mounting base and is used to hold counterweights.

4. The tire friction testing equipment according to claim 3, characterized in that: A weight limiting rod is provided at the center of the counterweight pan, and the counterweight is placed on the counterweight pan after passing through the weight limiting rod.

5. The tire friction testing equipment according to claim 2, characterized in that: The pulling mechanism includes a pulling motor connected to the base. A pulling screw is provided on the output end of the pulling motor. The pulling screw is rotatably connected to the base. A pulling slider is sleeved on the pulling screw. The pulling motor can drive the pulling slider to slide on the pulling screw. The force gauge is connected to the pulling slider.

6. The tire friction testing device according to claim 5, characterized in that: Two sliding guide rails are arranged in parallel on the base, and the pull slider and the mounting base are respectively slidably engaged with the sliding guide rails.

7. The tire friction testing equipment according to claim 5, characterized in that: A travel limit block is provided on the side of the base away from the pull motor. The mounting base can be connected to the travel limit block, and the travel limit block is used to limit the sliding travel of the mounting base.

8. The tire friction testing device according to any one of claims 1-7, characterized in that: The floor mounting fixture includes a limiting frame for limiting the board to be tested. The limiting frame is provided with multiple board fixing blocks, which are detachably connected to the limiting frame and can abut against the board to be tested within the limiting frame.

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