A pendulum friction coefficient tester forward static pressure calibration device

Abstract

The utility model discloses a pendulum friction coefficient tester positive static pressure calibration device belongs to pendulum friction coefficient tester technical field, and its technical scheme main points include pendulum friction coefficient tester body, bubble level, base and elevating handle, the bottom of base is provided with elevating system, the top of elevating system is provided with stabilizing mechanism, the bottom of elevating system is provided with bottom plate, the problem that the repeat leveling step is more complicated, and the efficiency of the friction coefficient test to the test road surface is influenced is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of pendulum friction coefficient measuring instruments, and in particular to a positive static pressure calibration device for a pendulum friction coefficient measuring instrument. Background Technology

[0002] In the fields of road engineering, traffic facility testing, and material friction performance evaluation, pendulum friction coefficient testers are widely used to measure the friction performance of surfaces such as road surfaces, airport runways, and anti-skid materials. The measurement results are of great significance to traffic safety and material research and development. During the measurement process of the pendulum friction coefficient tester, the normal static pressure is one of the core parameters affecting the accuracy of the measurement, and the contact distance between the rubber sheet and the ground is the basic condition for calibrating the normal static pressure. According to relevant standards, when the pendulum friction coefficient tester is working, the rubber sheet on both sides needs to be adjusted to a distance of 126 mm between the contact point with the test road surface. This distance directly determines the lever arm length when the pendulum head swings, and thus affects the magnitude of the normal static pressure applied to the rubber sheet by the pendulum head.

[0003] The existing rubber sheet has the ability to be squeezed and deformed. When the rubber sheet comes into contact with the ground, it may be squeezed and deformed, which may lead to measurement errors by the measuring personnel. In addition, the pendulum instrument has a fast lifting and lowering process, and the height of the pendulum instrument cannot be finely adjusted, so it cannot quickly achieve the purpose of debugging.

[0004] The existing patent (publication number: CN211856311U) discloses a positive static pressure calibration device for a pendulum friction coefficient measuring instrument. This device solves the problem that when the rubber sheet comes into contact with the ground, it may be squeezed and deformed, which may lead to measurement errors by the measuring personnel. It also addresses the issue that the pendulum instrument's lifting and lowering process is too fast, making it impossible to fine-tune the height of the pendulum instrument.

[0005] To address the aforementioned issues, existing patents offer solutions. However, most existing pendulum friction coefficient measuring instruments require rotating the three leveling bolts for initial horizontal adjustment, and then rotating the lifting handle to move the rubber sheet to contact the ground. During the process of adjusting the distance between the contact points of the rubber sheet and the test surface on both sides to 126 mm, the three leveling bolts need to be rotated again to raise or lower the instrument while maintaining the base level. This repeated leveling process is cumbersome and affects the efficiency of testing the friction coefficient of the test surface.

[0006] To address this, a positive static pressure calibration device for a pendulum friction coefficient measuring instrument is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a positive static pressure calibration device for a pendulum friction coefficient measuring instrument. This device solves the problem that most existing pendulum friction coefficient measuring instruments require rotating the three leveling bolts to initially adjust the level, and then rotating the lifting handle to move the rubber sheet to contact the ground. During the process of adjusting the distance between the two sides of the rubber sheet and the contact point of the test road surface to 126 mm, the three leveling bolts need to be rotated again to raise or lower the instrument while keeping the base level. This repeated leveling process is cumbersome and affects the efficiency of testing the friction coefficient of the test road surface.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a pendulum friction coefficient measuring instrument positive static pressure calibration device, comprising a pendulum friction coefficient measuring instrument body, a spirit level, a base and a lifting handle, wherein a lifting mechanism is provided at the bottom of the base, a stabilizing mechanism is provided at the top of the lifting mechanism, and a base plate is provided at the bottom of the lifting mechanism.

[0009] The lifting mechanism includes a lifting platform, a stud, a rotating drum, and a bearing. The top of the stud is fixedly connected to the bottom of the lifting platform. The stud is threaded inside the rotating drum. The surface of the rotating drum is fixedly connected to the inner wall of the bearing. The bottom of the outer wall of the bearing is fixedly connected to the top of the base plate.

[0010] Preferably, the bottom of the base plate is fixedly connected with anti-slip cones, and the number of anti-slip cones is three and they are evenly distributed on the bottom of the base plate.

[0011] Preferably, a lever is fixedly connected to the surface of the rotating drum, and the lever is a plurality of levers evenly distributed on the surface of the rotating drum.

[0012] Preferably, the stabilizing mechanism includes three limiting rings, three anti-detachment blocks, and three guide columns. The bottom of the limiting rings is fixedly connected to the top of the lifting platform, and the bottom of the anti-detachment blocks is fixedly connected to the top of the guide columns.

[0013] Preferably, the lifting platform has a guide hole inside for use with a guide column, and the guide column is slidably connected inside the guide hole.

[0014] Preferably, the base is internally threaded with a leveling knob, the bottom of which contacts the top of the lifting platform, and the leveling knob is located inside the limiting ring.

[0015] Preferably, handles are fixedly connected to both sides of the top of the lifting platform.

[0016] Preferably, the lifting platform, guide column, base plate, stud, and rotating cylinder are all made of magnesium-aluminum alloy.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This application, by setting up a lifting structure, allows the base plate to be placed on top of the test surface, the leveling knob to be placed inside the limit ring, and the base to be leveled by rotating the leveling knob. Then, the lever can be moved to rotate the drum. This eliminates the need to readjust the height of the base by rotating the three leveling knobs again. This makes it easier to adjust the distance between the two sides of the rubber sheet and the contact point with the test surface to 126 mm, avoiding repeated leveling. The 126 mm distance determines the lever arm length. According to the principle of torque balance, this distance, combined with the standard mass of the pendulum, enables the positive static pressure of the rubber sheet on the road surface to accurately reach 22.2 N, thereby quickly completing the calibration of the positive static pressure of the pendulum friction coefficient measuring instrument.

[0019] 2. This application sets up a stabilizing mechanism, and the limiting ring can limit the leveling button and the base to prevent the leveling button from losing contact with the lifting platform. By sliding the guide column inside the guide hole, the lifting platform can maintain stable up and down movement, which makes it easy to adjust the rubber sheet to a distance of 126 mm between the contact points of the two sides and the test road surface. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the pendulum friction coefficient measuring instrument's positive static pressure calibration device of this utility model.

[0021] Figure 2 This is a three-dimensional connection diagram of the lifting platform and the base plate in this utility model;

[0022] Figure 3 This is a side view of the connection between the lifting platform and the base plate in this utility model;

[0023] Figure 4 This is a three-dimensional connection diagram of the base plate and guide column in this utility model;

[0024] Figure 5 This is a three-dimensional structural diagram of the bottom of the lifting platform in this utility model.

[0025] In the diagram, 1. Pendulum friction coefficient measuring instrument body; 2. Anti-slip cone; 3. Level bubble; 4. Lifting mechanism; 401. Lifting platform; 402. Stud; 403. Rotary drum; 404. Bearing; 5. Base plate; 6. Leveling knob; 7. Base; 8. Lifting handle; 9. Stabilizing mechanism; 901. Limit ring; 902. Anti-detachment block; 903. Guide column; 10. Guide hole; 11. Handle; 12. Actuating rod; 13. Pendulum. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] A pendulum friction coefficient measuring instrument positive static pressure calibration device includes a pendulum friction coefficient measuring instrument body 1, a spirit level 3, a base 7 and a lifting handle 8. A lifting mechanism 4 is provided at the bottom of the base 7, a stabilizing mechanism 9 is provided at the top of the lifting mechanism 4, and a base plate 5 is provided at the bottom of the lifting mechanism 4.

[0029] The lifting mechanism 4 includes a lifting platform 401, a stud 402, a rotating drum 403, and a bearing 404. The top of the stud 402 is fixedly connected to the bottom of the lifting platform 401. The stud 402 is threadedly connected to the inside of the rotating drum 403. The surface of the rotating drum 403 is fixedly connected to the inner wall of the bearing 404. The bottom of the outer wall of the bearing 404 is fixedly connected to the top of the base plate 5.

[0030] In this embodiment: First, the base 7 is adjusted to a horizontal reference plane using the leveling knob 6 and the spirit level 3. Then, the lever 12 on the rotating drum 403 is moved, causing the drum 403 to rotate within the bearing 404. The threaded connection between the stud 402 and the rotating drum 403 allows the lifting platform 401 and the base 7 to rise and fall as a whole, quickly adjusting the distance between the rubber sheet and the contact point of the test surface to 126 mm. During this process, the guide post 903 of the stabilizing mechanism 9 cooperates with the anti-detachment block 902 and the limit ring 901 to ensure that the base 7 remains horizontal during lifting, avoiding repeated leveling. This is because the 126 mm distance determines the lever arm length. According to the principle of torque balance, this distance, combined with the standard mass of the pendulum 13, enables the positive static pressure of the rubber sheet on the road surface to accurately reach 22.2N, thus completing the calibration. This solves the problem that most existing pendulum friction coefficient testers require rotating the three leveling bolts for initial leveling, rotating the lifting handle to move the rubber sheet to contact the ground, and then adjusting the distance between the two sides of the rubber sheet and the test road surface to 126 mm. This process of repeatedly rotating the three leveling bolts to raise or lower the rubber sheet while keeping the base level is cumbersome and affects the efficiency of friction coefficient testing of the test road surface.

[0031] Specifically, such as Figure 3 As shown, the bottom of the base plate 5 is fixedly connected with anti-slip cones 2, and there are three anti-slip cones 2 evenly distributed on the bottom of the base plate 5.

[0032] Specifically, such as Figure 3 As shown, a lever 12 is fixedly connected to the surface of the rotating drum 403. The lever 12 is a number and is evenly distributed on the surface of the rotating drum 403.

[0033] In this embodiment: by having the anti-slip cone 2 contact the test road surface, the stability of the base plate 5 can be ensured, thereby ensuring the stability of the lifting platform 401 and the base 7. By moving the toggle lever 12, the rotating drum 403 can be driven to rotate. Through the threaded connection between the stud 402 and the inside of the rotating drum 403, the stud 402 can move up and down when the rotating drum 403 rotates, thereby driving the lifting platform 401 to move up and down, which facilitates the stable up and down movement of the pendulum friction coefficient measuring instrument body 1.

[0034] Specifically, such as Figure 3 As shown, the stabilizing mechanism 9 includes three limit rings 901, three anti-detachment blocks 902, and three guide posts 903. The bottom of the limit rings 901 is fixedly connected to the top of the lifting platform 401, and the bottom of the anti-detachment blocks 902 is fixedly connected to the top of the guide posts 903.

[0035] Specifically, such as Figure 2 and Figure 5 As shown, the lifting platform 401 has a guide hole 10 inside that works with the guide column 903, and the guide column 903 is slidably connected inside the guide hole 10.

[0036] Specifically, such as Figure 1 As shown, the base 7 has an internal threaded connection to a leveling knob 6. The bottom of the leveling knob 6 contacts the top of the lifting platform 401, and the leveling knob 6 is located inside the limit ring 901.

[0037] In this embodiment: when the lifting platform 401 moves up and down, the guide column 903 slides inside the guide hole 10, so that the lifting platform 401 can move up and down smoothly. By rotating the leveling knob 6, which is threadedly connected to the base 7, the base 7 can be easily leveled.

[0038] Specifically, such as Figure 3 As shown, handles 11 are fixedly connected to both sides of the top of the lifting platform 401.

[0039] Specifically, such as Figure 3 As shown, the lifting platform 401, guide column 903, base plate 5, stud 402 and rotating drum 403 are all made of magnesium-aluminum alloy.

[0040] In this embodiment, the lifting platform 401 and the base plate 5 can be easily moved by holding the handle 11. Since the lifting platform 401, guide column 903, base plate 5, stud 402 and rotating drum 403 are all made of magnesium-aluminum alloy, the lifting platform 401, guide column 903, base plate 5, stud 402 and rotating drum 403 have high strength and corrosion resistance, which can ensure the stability of the testing process and extend the service life.

[0041] Working principle: First, level the base 7 by rotating the leveling knob 6. The leveling bubble 3 displays the horizontal status in real time, ensuring the base 7 is on a horizontal reference plane. After leveling, when it is necessary to adjust the distance between the contact points of the rubber sheet and the test surface to 126 mm, the operator only needs to move the lever 12 on the surface of the rotating drum 403, causing the drum 403 to rotate within the bearing 404. Since the stud 402 is threadedly connected to the rotating drum 403 and its top is fixed to the lifting platform 401, the rotation of the drum 403 will cause the stud 402 to rise or fall axially, thereby driving the lifting platform 401 and the base 7 to rise and fall as a whole, quickly changing the position. The vertical distance between the rubber sheet and the test surface is adjusted until the distance between the two sides of the rubber sheet and the contact point with the test surface is 126 mm. During this process, the three guide columns 903 of the stabilizing mechanism 9 slide within the guide holes 10 of the lifting platform 401. The top anti-detachment block 902 cooperates with the limit ring 901 to restrict the smooth up and down displacement of the lifting platform 401, ensuring that the base 7 remains horizontal during the lifting process. This avoids the inefficiency caused by the cumbersome operation of repeatedly adjusting with traditional leveling bolts. Since the distance between the two sides of the rubber sheet and the contact point with the test surface is adjusted to 126 mm, the lever arm length is directly determined. According to the principle of torque balance, the pendulum 13... Gravity is converted into positive static pressure of the rubber sheet on the test surface through the lever arm. Therefore, accurate adjustment of this distance is the basis for positive static pressure calibration. When the spacing is 126 mm, the lever arm length meets the standard requirements. Combined with the standard mass of the pendulum 13 assembly, the positive static pressure can accurately reach the specified value of 22.2 N, thereby ensuring the reliability of the friction coefficient measurement results and realizing the positive static pressure calibration of the pendulum friction coefficient measuring instrument. The diameter of the limit ring 901 is larger than that of the leveling knob 6, which not only provides rotation space for the leveling knob 6, but also prevents excessive offset of the base 7 through physical limitation, further ensuring the levelness and pressure during the calibration process. The stability of the value is improved by separating the leveling and spacing adjustment processes, avoiding the drawbacks of repeated leveling in traditional operations. This significantly improves the efficiency and accuracy of positive static pressure calibration. It also solves the problem that most existing pendulum friction coefficient testers require rotating the three leveling bolts to initially adjust the level, rotating the lifting handle to move the rubber sheet to contact the ground, and then adjusting the distance between the two sides of the rubber sheet and the test surface to 126 mm. This repeated leveling process is cumbersome and affects the efficiency of friction coefficient testing of the test surface.

[0042] It should be noted that the design of the pendulum friction coefficient measuring instrument body 1 and the rubber sheet both comply with the requirements of current national standards and relevant industry specifications. Its structural composition, working principle and operation process are all well-known technologies in this field, and standardized application schemes have been formed in industry standards such as highway engineering testing and airport runway friction performance evaluation. Therefore, this device focuses on improving the control technology of positive static pressure during the calibration process, and the above-mentioned existing mature technologies will not be elaborated further.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positive static pressure calibration device for a pendulum friction coefficient measuring instrument, comprising a pendulum friction coefficient measuring instrument body (1), a spirit level (3), a base (7), and a lifting handle (8), characterized in that: The base (7) is provided with a lifting mechanism (4) at the bottom, a stabilizing mechanism (9) is provided at the top of the lifting mechanism (4), and a base plate (5) is provided at the bottom of the lifting mechanism (4). The lifting mechanism (4) includes a lifting platform (401), a stud (402), a rotating drum (403), and a bearing (404). The top of the stud (402) is fixedly connected to the bottom of the lifting platform (401). The stud (402) is threadedly connected to the inside of the rotating drum (403). The surface of the rotating drum (403) is fixedly connected to the inner wall of the bearing (404). The bottom of the outer wall of the bearing (404) is fixedly connected to the top of the base plate (5).

2. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 1, characterized in that: The bottom of the base plate (5) is fixedly connected with anti-slip cones (2), and the number of anti-slip cones (2) is three and they are evenly distributed on the bottom of the base plate (5).

3. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 1, characterized in that: A lever (12) is fixedly connected to the surface of the rotating drum (403), and there are several levers (12) evenly distributed on the surface of the rotating drum (403).

4. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 1, characterized in that: The stabilizing mechanism (9) includes three limiting rings (901), three anti-detachment blocks (902) and three guide posts (903). The bottom of the limiting rings (901) is fixedly connected to the top of the lifting platform (401), and the bottom of the anti-detachment blocks (902) is fixedly connected to the top of the guide posts (903).

5. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 4, characterized in that: The lifting platform (401) has a guide hole (10) inside that works with the guide column (903), and the guide column (903) is slidably connected inside the guide hole (10).

6. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 1, characterized in that: The base (7) is internally threaded with a leveling knob (6), the bottom of which contacts the top of the lifting platform (401), and the leveling knob (6) is located inside the limiting ring (901).

7. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 1, characterized in that: Handles (11) are fixedly connected to both sides of the top of the lifting platform (401).

8. The pendulum friction coefficient measuring instrument positive static pressure calibration device according to claim 4, characterized in that: The lifting platform (401), guide column (903), base plate (5), stud (402) and rotating drum (403) are all made of magnesium-aluminum alloy.

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