Pavement friction coefficient measuring device

Abstract

The utility model discloses a road surface friction coefficient measuring device which comprises a base, a telescopic rod, a dial, a pendulum bob, a pointer and a connecting piece, the telescopic rod is vertically arranged above the base, the top of the telescopic rod is sleeved with the connecting piece, the end of the pointer and the end of the pendulum bob are both arranged on the connecting piece in a sleeved mode, the end of the dial is fixedly connected with the connecting piece, and the end of the dial is fixedly connected with the connecting piece. A supporting plate is arranged on the side edge of the dial, a sliding hole is formed in the supporting plate, a stop lever is arranged at the sliding hole in a penetrating mode, and the stop lever is arranged in an adjustable mode and can stop the pendulum bob; according to the utility model, the stop lever and the sliding hole are arranged, the sliding hole is obliquely arranged, and the stop lever can move in the sliding hole, so that the stop lever can be stably arranged at the bottom of the sliding hole; when the pendulum bob returns to move, the pendulum bob can impact the stop lever to eliminate energy and stop moving, a worker does not need to stretch out a hand to stop the pendulum bob, and palm pain of the worker is avoided.

Description

Technical Field

[0001] The utility model relates to the field of pendulum instruments, in particular to a road surface friction coefficient measuring device. Background Art

[0002] The road friction coefficient refers to the friction generated by the contact between the tire and the road surface when a vehicle is driving. This coefficient can reflect the vehicle's performance in braking, acceleration, steering, and other activities under different road conditions. Therefore, during road acceptance, the road's friction coefficient must be measured to determine whether the road surface meets the standards.

[0003] Currently, the tool used to measure the coefficient of road friction is generally a pendulum instrument. Based on the principle that "the potential energy of the pendulum is equal to the work done by the rubber sheet mounted at the end of the pendulum arm to overcome road friction as it slides across the road," this instrument measures the anti-skid value of road surfaces, road markings, or other material specimens. The instrument primarily includes a base, column, release switch, pendulum head, and dial. For specific results, reference can be made to a Chinese patent with publication number CN110018115B, which discloses a fixed-point, direction-adjustable pendulum friction coefficient instrument comprising a support device, a rotating device, and a measuring device. The measuring device is connected to the rotating device via a pointer fixed shaft and a pendulum fixed shaft, respectively. The rotating device is embedded above the angle disk and forms an integral unit with the support device.

[0004] When using the pendulum instrument provided by the aforementioned patent, or any other pendulum instrument, the instrument must first be leveled and the spirit level centered. The instrument must then be zeroed and its sliding length verified. The test road surface must then be watered with water from a spray bottle and the surface mud scraped off with a rubber scraper. Finally, the release switch must be pressed to allow the pendulum to slide across the road surface, whereupon the pointer will indicate the road surface's pendulum value. After the pendulum is released, it rotates the pointer. During the pendulum's return motion, a worker must reach out and hold the pendulum to stop it, preventing the pendulum's motion from affecting the pointer's position.

[0005] When the pendulum moves from a horizontal position in a circular motion, it moves at a high speed. When a worker's palm stops the pendulum, it impacts their palm. Measuring the road friction coefficient at each point requires multiple sets of measurements to obtain accurate data. Furthermore, when measuring multiple points on the same road surface, workers must stop the pendulum multiple times, which can cause pain in their palms. Wearing heavy gloves can hinder hand movement and, in turn, affect instrument operation. Utility Model Content

[0006] The utility model aims to provide a road friction coefficient measuring device, aiming to improve the problem that a pendulum instrument needs to stop the swing with the palm of a person when measuring the road friction coefficient.

[0007] The utility model is implemented as follows: a road friction coefficient measuring device includes a base, a telescopic rod, a dial, a pendulum, a pointer and a connecting piece, the telescopic rod is vertically arranged above the base, the connecting piece is sleeved on the top of the telescopic rod, the ends of the pointer and the pendulum are sleeved on the connecting piece, the end of the dial is fixedly connected to the connecting piece, a side support plate of the dial is provided with a sliding hole on the support plate, a blocking rod is provided through the sliding hole, the blocking rod is adjustable and can block the pendulum.

[0008] Preferably, an I-shaped tube is sleeved on the barrier rod, and a magnet is embedded on the I-shaped tube, and the magnet can be attracted to the pull plate at the end of the barrier rod.

[0009] Preferably, an annular plate may be sleeved on the end of the blocking rod, and the annular plate is arranged at the end of the sliding hole, and the adjacent side surfaces at both ends of the I-shaped pipe are in contact with the two opposite side walls of the support plate.

[0010] Preferably, the sliding hole is arranged obliquely, a retaining groove is arranged at the bottom of the sliding hole, and a notch is arranged in the middle, the notch is arranged above the sliding hole, and the width is greater than or equal to the diameter of the I-tube.

[0011] Preferably, a second connecting groove is provided on the support plate, a connecting plate is provided at the second connecting groove, a first connecting groove is provided on the scale plate, and a protrusion is fixedly provided on the side, the end of the connecting plate is installed in the first connecting groove, and the protrusion extends into the notch.

[0012] Preferably, the connecting member includes a support shaft, a baffle, a first arc plate and a second arc plate, the support shaft and the first arc plate are respectively arranged on both sides of the baffle, and the second arc plate is detachably arranged on the side of the first arc plate; the first arc plate and the second arc plate are sleeved on the telescopic rod, the end angle of the degree dial is sleeved on the support shaft, and the side fixed rod is inserted into the baffle.

[0013] Preferably, the telescopic rod includes a bottom rod, a sleeve, a threaded rod and a handle, the top of the bottom rod is inserted into the sleeve, the threaded rod is arranged in the sleeve, the lower end is threadedly inserted into the bottom rod, the upper end is connected through a bearing and passes through the top of the sleeve, and the handle is vertically arranged on the threaded rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model is provided with a stop rod and a sliding hole. Since the sliding hole is arranged at an angle and the stop rod can move in the sliding hole, the stop rod can be stably arranged at the bottom of the sliding hole. When the pendulum returns, the pendulum can hit the stop rod to eliminate energy and stop the movement. There is no need for the staff to reach out to stop the pendulum, thereby avoiding pain in the staff's palm.

[0016] 2. The utility model is provided with a baffle rod, a sliding hole and an annular plate. When the staff moves the baffle rod to the top of the sliding hole, the end of the baffle rod passes through the annular plate, and the baffle rod can be stably placed relative to the support plate, thereby supporting the pendulum to be stably in a horizontal state; when the pendulum needs to move, the baffle rod is pulled away from the annular plate to release the restriction of the pendulum and the pointer, so that the pendulum and the pointer can move to complete the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 It is a structural diagram of the base of the utility model;

[0019] Figure 3 It is a structural diagram of the telescopic rod of the utility model;

[0020] Figure 4 This is a schematic structural diagram of the dial, connector, pointer and pendulum of the utility model;

[0021] Figure 5 It is a structural diagram of the connecting piece of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the first dial of the utility model;

[0023] Figure 7 This is a schematic structural diagram of the second dial of the utility model;

[0024] Figure 8 It is a structural diagram of the support plate of the utility model;

[0025] Figure 9 It is a structural schematic diagram of the baffle bar of the present utility model.

[0026] In the figure: 1. base; 11. main board; 12. adjusting screw; 13. support plate; 2. telescopic rod; 21. limiting groove; 22. bottom rod; 23. sleeve; 24. threaded rod; 25. handle; 3. dial; 31. scale; 32. bump; 33. first connecting groove; 34. plug rod; 4. connecting piece; 41. supporting shaft; 42. baffle plate; 43. first arc plate; 44. second arc plate; 5. pointer; 6. pendulum; 7. support plate; 71. second connecting groove; 72. notch; 73. sliding hole; 74. connecting plate; 75. baffle groove; 8. baffle rod; 81. annular plate; 82. I-tube; 83. pull plate; 84. magnet. DETAILED DESCRIPTION

[0027] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0029] Example 1

[0030] The background technology records that when using a pendulum instrument to measure multiple groups of friction coefficients on the road surface, when the staff uses their hands to stop the pendulum moving at a high speed, it is easy to cause pain in the staff's palms. In order to solve this problem, this embodiment provides a new technical solution, which is detailed below.

[0031] like Figure 1 As shown, the existing pendulum instrument has been disclosed, and a brief introduction is given here. The pendulum instrument includes a base 1, a telescopic rod 2, a dial 3, a pendulum 6, a pointer 5 and a connecting member 4. The telescopic rod 2 is vertically arranged above the base 1, and the connecting member 4 is sleeved on the top of the telescopic rod 2. The ends of the pointer 5 and the pendulum 6 are sleeved on the connecting member 4, and the end of the dial 3 is fixedly connected to the connecting member 4.

[0032] like Figure 5 As shown, the connecting member 4 includes a support shaft 41, a baffle 42, a first curved plate 43, and a second curved plate 44. The support shaft 41 and the first curved plate 43 are respectively arranged on either side of the baffle 42, and the second curved plate 44 is detachably mounted on the side of the first curved plate 43. With the cooperation of the first curved plate 43 and the second curved plate 44, the support shaft 41 and the baffle 42 can be stably mounted on the side of the telescopic rod 2. The end corners of the degree dial 3 are mounted on the support shaft 41, and the fixed rod 34 on the side is inserted into the baffle 42. The degree dial 3 is provided with a scale 31, so that the operator can determine the friction coefficient value by using the pointer 5. In addition, the pendulum 6 is mounted on the support shaft 41 via a bearing connection. The end of the pointer 5 is also mounted on the support shaft 41. However, it can rotate under external force. When the external force is removed, it remains stationary relative to the degree dial 3. Therefore, a plate is provided at the end of the pendulum 6, and the end of the plate extends to the side of the pointer 5. Under the action of the plate, the pointer 5 and the pendulum 6 can move synchronously.

[0033] like Figure 3As shown, in addition, in order to adjust the position of the pendulum 6 relative to the road surface, the telescopic rod 2 includes a bottom rod 22, a sleeve 23, a threaded rod 24 and a handle 25. A limiting groove 21 is provided on the bottom rod 22, and the top is inserted into the sleeve 23. The limiting groove 21 is arranged along the height direction of the bottom rod 22, and the top is arranged to be open. A convex column (not shown in the figure) is provided in the sleeve 23 and is located in the limiting groove 21. Therefore, the bottom rod 22 and the sleeve 23 will not rotate relative to each other. The threaded rod 24 is arranged in the sleeve 23, and the lower end is threadedly inserted into the bottom rod 22, and the upper end is connected by a bearing and passes through the top of the sleeve 23. The handle 25 is vertically arranged on the threaded rod 24. After holding the handle 25, the threaded rod 24 can be controlled to rotate, thereby adjusting the relative position of the bottom rod 22 and the sleeve 23.

[0034] like Figure 2 As shown, the base 1 includes a main board 11 and a support board 13. The main board 11 and the support board 13 are connected to the same connecting block. A level bubble is provided on the connecting block. In addition, an adjusting screw 12 is provided at the end of the main board 11 and the support board 13. Therefore, the horizontal state of the base 1 can be adjusted by rotating the adjusting screw 12.

[0035] like Figure 1 、 Figure 4 、 Figure 6 As shown, in order to change the current situation where the staff's palm stops the pendulum 6, a support plate 7 is provided on the side of the dial 3. The support plate 7 is provided with an arc structure, and a sliding hole 73 is provided on the support plate 7. The sliding hole 73 is inclined, and the bottom center is opposite to the center of the connecting member 4. A blocking groove 75 is provided at the bottom of the sliding hole 73, and a notch 72 is provided in the middle. The notch 72 is provided above the sliding hole 73. A stopper 8 is provided through the slide hole 73. An I-shaped tube 82 is sleeved on the stopper 8. A magnet 84 is embedded in the I-shaped tube 82. The magnet 84 attracts the pull plate 83 at the end of the stopper 8. Therefore, when the force applied to the stopper 8 is removed, the stopper 8 moves and the pull plate 83 comes into contact. The adjacent sides of the I-shaped tube 82 contact the two opposite side walls of the support plate 7. The stopper groove 75 is larger than the I-shaped tube 82, and the width of the notch 72 is greater than or equal to the diameter of the I-shaped tube 82. The I-shaped tube 82 can pass through the notch 72, enabling the removal and assembly of the stopper 8 and increasing the flexibility of the device. Therefore, the I-shaped tube 82 is stably and movably arranged relative to the support plate 7. That is, under the action of the I-shaped tube 82, the stopper 8 is stably mounted relative to the support plate 7 and can move along the length of the slide hole 73. When the blocking rod 8 is located at the bottom of the sliding hole 73 and the pendulum 6 moves back, the blocking rod 8 can move from the sliding hole 73 to the blocking groove 75 under the action of the pendulum 6. With the cooperation of the blocking groove 75 and the blocking rod 8, the pendulum 6 stops moving. If the pendulum 6 tends to move in the opposite direction, the staff can stop it.

[0036] like Figure 8 、 Figure 9As shown, the baffle 8 can also be stably mounted at the top of the slide hole 73 to support the pendulum 6 in a horizontal position. Specifically, an annular plate 81 is bolted to the side of the top of the slide hole 73. The annular plate 81 does not contact the support plate 7 and does not affect the movement of the I-shaped tube 82. When the staff needs to horizontally position the pendulum 6 to complete the friction coefficient measurement, the staff pulls the pendulum 6 upward and simultaneously pulls the baffle 8 along the slide hole 73. When the baffle 8 moves to the top of the slide hole 73, it restricts the position of the I-shaped tube 82 and allows the end of the baffle 8 to pass through the annular plate 81. At this point, the end of the baffle 8 protrudes from the annular plate 81 and is located below the pendulum 6. Under the action of the baffle 8, the pendulum 6 can be stably placed horizontally. When the pendulum 6 needs to move, the staff pulls the pull plate 83 to move the baffle 8, that is, the end of the baffle 8 is separated from the annular plate 81. At this time, the pendulum 6 and the pointer 5 move synchronously. During the downward movement of the pendulum 6, the staff controls the I-shaped tube 82 and the stopper 8 to move downward, and after they deviate from the annular plate 81, the force acting on the stopper 8 is removed, and the stopper 8 and the I-shaped tube 82 move to the bottom of the slide hole 73. When the pendulum 6 returns to its original position, it hits the stopper 8 and stops moving.

[0037] Example 2

[0038] like Figure 7 、 Figure 8 As shown, on the basis of Example 1, in order to ensure that the support plate 7 is stably installed on the degree dial 3, a second connecting groove 71 is provided on the support plate 7, and a connecting plate 74 is provided at the second connecting groove 71. A first connecting groove 33 is provided on the degree dial 3, and a protrusion 32 is fixedly provided on the side. The end of the connecting plate 74 is installed in the first connecting groove 33. Therefore, under the action of the connecting plate 74, the support plate 7 can be stably placed relative to the degree dial 3, and the protrusion 32 extends into the notch 72 to block the notch 72, thereby preventing the I-tube 82 from entering the notch 72 and affecting its operation.

[0039] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A road friction coefficient measuring device, comprising a base (1), a telescopic rod (2), a dial (3), a pendulum (6), a pointer (5) and a connecting member (4), wherein the telescopic rod (2) is vertically arranged above the base (1), the connecting member (4) is sleeved on the top of the telescopic rod (2), the ends of the pointer (5) and the pendulum (6) are sleeved on the connecting member (4), and the end of the dial (3) is fixedly connected to the connecting member (4), characterized in that: A sliding hole (73) is provided on a side support plate (7) of the degree plate (3), and a blocking rod (8) is provided through the sliding hole (73). The blocking rod (8) is adjustable and can block the pendulum (6).

2. A road friction coefficient measuring device according to claim 1, characterized in that: An I-shaped tube (82) is sleeved on the blocking rod (8), and a magnet (84) is embedded on the I-shaped tube (82). The magnet (84) can be attracted to a pull plate (83) at the end of the blocking rod (8).

3. A road friction coefficient measuring device according to claim 2, characterized in that: An annular plate (81) can also be sleeved on the end of the blocking rod (8), and the annular plate (81) is arranged at the end of the sliding hole (73). The adjacent side surfaces at both ends of the I-shaped tube (82) are in contact with the two opposite side walls of the support plate (7).

4. A road friction coefficient measuring device according to claim 3, characterized in that: The sliding hole (73) is arranged obliquely, a retaining groove (75) is arranged at the bottom of the sliding hole (73), and a notch (72) is arranged in the middle. The notch (72) is arranged above the sliding hole (73) and has a width greater than or equal to the diameter of the I-shaped pipe (82).

5. A road friction coefficient measuring device according to claim 4, characterized in that: The support plate (7) is provided with a second connecting groove (71), a connecting plate (74) is provided at the second connecting groove (71), a first connecting groove (33) is provided on the scale plate (3), and a protrusion (32) is fixedly provided on the side, an end of the connecting plate (74) is installed in the first connecting groove (33), and the protrusion (32) extends into the notch (72).

6. The road friction coefficient measuring device according to claim 1, characterized in that: The connecting member (4) comprises a supporting shaft (41), a baffle (42), a first arc plate (43) and a second arc plate (44); the supporting shaft (41) and the first arc plate (43) are respectively arranged on both sides of the baffle (42); the second arc plate (44) is detachably arranged on the side of the first arc plate (43); the first arc plate (43) and the second arc plate (44) are sleeved on the telescopic rod (2); the end angle of the degree plate (3) is sleeved on the supporting shaft (41), and the insertion rod (34) fixed on the side is inserted into the baffle (42).

7. The road friction coefficient measuring device according to claim 1, characterized in that: The telescopic rod (2) comprises a bottom rod (22), a sleeve (23), a threaded rod (24) and a handle (25). The top of the bottom rod (22) is inserted into the sleeve (23). The threaded rod (24) is arranged in the sleeve (23). The lower end is threadedly inserted into the bottom rod (22). The upper end is connected through a bearing and passes through the top of the sleeve (23). The handle (25) is vertically arranged on the threaded rod (24).

Images