A measuring device considering comprehensive anti-slip index of road longitudinal slope

Abstract

The utility model discloses a measuring device that considers the comprehensive anti-skid index of the longitudinal slope of the road surface, and belongs to the field of highway engineering technology. It includes a base plate, a slide rail is provided at the center of the base plate, a booster block is provided inside the slide rail, the booster block is connected to a catapult arranged at one end of the slide rail, an anti-collision sponge and infrared rays are arranged in sequence at the other end of the slide rail, a display screen, a power button and an infrared sensing timing device are arranged on one side of the slide rail, universal wheels are installed at the four corners of the bottom of the base plate, and a handrail is installed at one end of the base plate close to the catapult. The utility model can truly reflect the anti-skid performance of the road surface, ensure that the vehicle has sufficient braking force during road driving, and improve driving safety. The principle that friction force is proportional to positive pressure and dynamic friction coefficient is adopted, the operation process is simple and easy, the test speed is fast, the measuring device is easy to move, and the randomness of the test results is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of highway engineering, in particular to a measuring device taking into account comprehensive anti-slip indexes of road longitudinal slope. Background Art

[0002] With the development of the transportation industry, my country has higher and higher requirements for traffic safety, but the evaluation methods for the construction and maintenance of transportation infrastructure have been unable to keep up with the development of the times. There is a lack of reasonable and efficient evaluation methods, making it difficult to effectively evaluate the safety of transportation facilities. By the end of 2022, my country's highway mileage has reached 5.3548 million kilometers, and the maintenance task has increased year by year; road maintenance is the top priority of road safety. To ensure that the road surface has sufficient anti-skid performance and ensure driving safety, it is urgent to propose a reasonable and effective evaluation method.

[0003] At present, the anti-skid performance test in my country mainly adopts the pendulum tribometer. On the one hand, the pendulum tribometer is bulky and difficult to carry. On the other hand, the pendulum tribometer measures the friction coefficient of a certain point, which has a great randomness. At the same time, the measurement accuracy is affected by many factors, and the accuracy is difficult to guarantee. In the announcement number CN214427252U, a high-speed portable road friction coefficient measuring device was disclosed. Although it solves the portability problem of the pendulum tribometer to a certain extent, because the braking force of the vehicle mainly comes from the friction of the road surface and the component force generated by the vehicle's gravity on the longitudinal slope, it is still difficult to meet the current road maintenance requirements for anti-skid performance evaluation. Utility Model Content

[0004] In view of the above-mentioned problems, the purpose of the utility model is to provide a measuring device for the comprehensive anti-skid index taking into account the longitudinal slope of the road surface. Through this index and the measuring method, the anti-skid performance of the road surface can be more accurately reflected, providing a reference for road surface maintenance.

[0005] To achieve the above-mentioned purpose, the utility model provides a measuring device that takes into account the comprehensive anti-skid index of the longitudinal slope of the road surface, including a base plate, a slide rail is opened at the center of the base plate, a booster block is clamped inside the slide rail, the booster block is connected to a catapult arranged at one end of the slide rail, an anti-collision sponge and infrared rays are arranged in sequence at the other end of the slide rail, a display screen, a power button and an infrared sensing timing device are respectively arranged on one side of the slide rail, universal wheels are installed at the four corners of the bottom of the base plate, and a handrail is installed at one end of the base plate close to the catapult.

[0006] Preferably, a plurality of pulleys are installed on both sides of the boosting block, and a first opening and a second opening are respectively formed at both ends of the boosting block.

[0007] Preferably, the slide rail is a "concave" structure.

[0008] Preferably, friction sliders are inserted into the first opening and the second opening.

[0009] Preferably, handles are installed on both sides above the friction slider, and the outer surface of the handles is provided with limiting holes, and limiting rods are inserted into the limiting holes.

[0010] Therefore, the utility model adopts a measuring device for considering the comprehensive anti-skid index of the longitudinal slope of the road surface with the above structure, which has the following beneficial effects:

[0011] (1) Compared with the traditional road friction coefficient, the comprehensive anti-skid index that takes into account the longitudinal slope can more truly reflect the anti-skid performance of the road surface, guide the progress of road maintenance work, ensure that vehicles have sufficient braking force during road driving, and improve driving safety.

[0012] (2) The principle that friction force is proportional to normal pressure and dynamic friction coefficient is adopted. The operation process is simple and easy, the test speed is fast, and the measuring device is easy to move.

[0013] (3) Compared with the traditional pendulum friction tester, which measures the friction coefficient at a certain point, the utility model realizes the comprehensive anti-slip index measurement of a belt, reducing the randomness of the test results.

[0014] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a measuring device for considering the comprehensive anti-slip index of the longitudinal slope of the road surface according to the utility model;

[0016] Figure 2 This is a schematic diagram of the booster block structure of a measuring device for considering the comprehensive anti-slip index of the longitudinal slope of the road surface according to the utility model;

[0017] Figure 3 This is a schematic diagram of the slide rail structure of a measuring device for considering the comprehensive anti-slip index of the longitudinal slope of the road surface according to the utility model;

[0018] Figure 4 This is a schematic diagram of the friction slider structure of a measuring device for considering the comprehensive anti-skid index of the longitudinal slope of the road surface according to the utility model;

[0019] Figure 5 This is a schematic diagram of the limit rod structure of a measuring device that takes into account the comprehensive anti-slip index of the longitudinal slope of the road surface according to the utility model;

[0020] Reference numerals

[0021] 1. Universal wheel, 2. Anti-collision sponge, 3. Infrared ray, 4. Infrared sensing timing device, 5. Level, 6. Display screen, 7. Power button, 8. Armrest, 9. Ejector, 10. Boost block, 11. Slide rail, 12. First opening, 13. Pulley, 14. Second opening, 15. Handle, 16. Limit hole, 17. Friction slider, 18. Limit rod. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Example

[0025] like Figure 1-5 As shown, the utility model provides a measuring device that considers the comprehensive anti-skid index of the longitudinal slope of the road surface, including a bottom plate, a slide rail 11 is provided in the center of the bottom plate, a booster block 10 is provided inside the slide rail 11, the booster block 10 is connected to a catapult 9 provided at one end of the slide rail 11, the catapult 9 is located at the starting end of the slide rail 11, and an anti-collision sponge 2 and an infrared ray 3 are provided in sequence at the other end of the slide rail 11, a display screen 6, a power button 7 and an infrared sensing timing device 4 are provided on one side of the slide rail 11, universal wheels 1 are installed at the four corners of the bottom of the bottom plate, and a handrail 8 is installed at the end of the bottom plate close to the catapult 9. The infrared sensing timing device 4 is located on the left side of the bottom of the slide rail 11 and can emit infrared rays.

[0026] A plurality of pulleys 13 are installed on both sides of the boosting block 10, and a first opening 12 and a second opening 14 are respectively opened at both ends of the boosting block 10. The boosting block 10 has a size of 300 mm×200 mm and weighs 1 kg.

[0027] The slide rail 11 is a "concave" structure, and the length of the slide rail 11 is 1.3m.

[0028] The first opening 12 and the second opening 14 are provided with a friction slider 17. The friction slider has a length and width of 300 mm×200 mm and weighs 2 kg.

[0029] Handles 15 are installed on both sides above the friction slider 17 . The outer surface of the handle 15 is provided with a limiting hole 16 , and a limiting rod 18 is inserted into the limiting hole 16 .

[0030] Comprehensive anti-slip index The expression is as follows:

[0031]

[0032] Where μ is the friction coefficient; ± is + when the vehicle is traveling uphill, and ± is - when the vehicle is traveling downhill; θ is the slope angle, θ = tan -1 i, i is the slope.

[0033] A comprehensive anti-slip index considering the longitudinal slope of the road surface The test method of the measuring device is carried out according to the following steps:

[0034] (1) Test preparation

[0035] ① Clean the road section to be measured and moisten it with water.

[0036] ② Place the measuring device in a cart and push it to the road section to be measured.

[0037] ③ Error elimination: disconnect the friction slider, start the catapult, apply an initial velocity of 5m / min to the booster block, and measure the time t required for the booster block to move forward 1m 1 , the friction force f between the pulley and the rail and the gravity force G can be obtained 1 and force F.

[0038] ④Insert the friction slider into the booster block and start measuring.

[0039] (2) Experimental determination

[0040] ① Start the catapult, apply an initial velocity of 5 m / min to the booster block, and measure the time t required for the booster block and the friction slider to move forward 1 m 2 .

[0041] (3) Results

[0042] ① The sum of the friction between the pulley and the rail and the gravity component of the booster block along the rail is calculated using the following formula:

[0043] Depend on

[0044] have to

[0045] Where: m 1 The weight of the booster block is 1 kg, v 0 The initial speed of the slider is 5m / min, s is the length of the rail minus the length of the slider, which is 1m, and a 1 is the acceleration of the booster block.

[0046] ②The comprehensive anti-slip index is calculated according to the following formula:

[0047] Depend on

[0048] have to

[0049] Where: m 2 The weight of the friction slider is 2kg, a 2 is the acceleration of the booster block and the friction slider, f is the resultant force of the friction slider and the gravity component of the friction slider along the longitudinal slope of the road surface, and g is the acceleration due to gravity, which is 10m / s 2 .

[0050] A certain road section is measured, and the measurement results are shown in Table 1:

[0051] Table 1

[0052]

[0053] The test results show that the slope has an important influence on the comprehensive anti-skid index of the road surface. The influence of is significant. On the same road, the comprehensive anti-skid index of the uphill section It is significantly greater than the downhill road surface, so the comprehensive anti-skid index is proposed considering the longitudinal slope of the road surface. It is very necessary.

[0054] Therefore, the utility model adopts the above-mentioned measuring device that takes into account the comprehensive anti-skid index of the longitudinal slope of the road surface, which can truly reflect the anti-skid performance of the road surface, guide the progress of road maintenance work, ensure that the vehicle has sufficient braking force during road driving, and improve driving safety. The principle that friction force is proportional to positive pressure and dynamic friction coefficient is adopted. The operation process is simple and easy, the test speed is fast, and the measuring device is easy to move. Compared with the traditional pendulum tribometer, the measurement of the friction coefficient at a certain point, the utility model realizes the comprehensive anti-skid index measurement of a strip, reducing the randomness of the test results.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A measuring device that takes into account the comprehensive anti-slip index of the road longitudinal slope, characterized in that: The utility model comprises a bottom plate, a slide rail is provided at the center of the bottom plate, a booster block is provided inside the slide rail, the booster block is connected to a catapult arranged at one end of the slide rail, an anti-collision sponge and infrared rays are arranged in sequence at the other end of the slide rail, a display screen, a power button and an infrared sensing timing device are respectively arranged on one side of the slide rail, universal wheels are installed at the four corners of the bottom of the bottom plate, and an armrest is installed at one end of the bottom plate close to the catapult.

2. The measuring device for comprehensive anti-slip index considering road longitudinal slope according to claim 1, characterized in that: A plurality of pulleys are installed on both sides of the boosting block, and a first opening and a second opening are respectively opened at both ends of the boosting block.

3. The measuring device for comprehensive anti-slip index considering road longitudinal slope according to claim 1, characterized in that: The slide rail is a "concave" structure.

4. The measuring device for comprehensive anti-slip index considering road longitudinal slope according to claim 2 is characterized in that: Friction sliders are inserted into the first opening and the second opening.

5. The measuring device for comprehensive anti-slip index considering road longitudinal slope according to claim 4 is characterized in that: Handles are installed on both sides above the friction sliding block, and limiting holes are arranged on the outer surfaces of the handles, and limiting rods are inserted into the limiting holes.

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