An airport runway friction coefficient detection device

Abstract

The application relates to the runway detection technical field, and discloses an airport runway friction coefficient detection device, which comprises a power machine, the power machine is fixedly installed at the top of a top plate, the output shaft of the power machine penetrates through the top plate and extends to the lower side of the top plate, one end of the output shaft of the power machine is fixedly installed with a rotating disc, the first connecting shaft is fixedly installed on the position close to the outer side of the bottom of the rotating disc, the outer surface of the first connecting shaft is movably sleeved with a swing rod, and the front side of the outer surface of the swing rod is fixedly installed with an extension rod. When the device is driven by a carrier to move on a runway, the power machine is in a running state and drives the rotating disc to rotate, under the action, the fixed rod starts to swing left and right, the sliding block and the second connecting shaft are driven to synchronously swing through the transmission effect of the inductive device, so that the rear suspension rod is always in the state of moving left and right, the wider range on the runway can be detected during the movement of the carrier, and the practicability of the device is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the runway detection technical field, in particular to an airport runway friction coefficient detection device. BACKGROUND

[0002] The airport runway is an important facility for the takeoff and landing of an airplane, and the friction coefficient of the runway surface directly affects the takeoff and landing performance of the airplane. When the friction coefficient is too high, the airplane engine needs to be at a larger power during takeoff, causing high oil consumption. When the friction coefficient is too low, the airplane landing speed is too slow, so the runway length needs to be extended to ensure the safety of airplane landing. Therefore, in order to ensure that the friction coefficient of the airplane runway surface is within a proper range, the friction coefficient of the runway needs to be detected. The traditional detection device has a small and narrow detection range during use, needs to be repeatedly detected on the runway, and the detection cost and difficulty are increased. To this end, the application file proposes an airport runway friction coefficient detection device, which aims to solve the above problems. SUMMARY

[0003] The application proposes an airport runway friction coefficient detection device, which has the advantages of expanding the detection range by swinging, and aims to solve the problem of repeated detection caused by the narrow detection range of the traditional device.

[0004] To achieve the above purpose, the application adopts the following technical scheme: an airport runway friction coefficient detection device, comprising a top plate, a mounting plate is fixedly installed at the front end of the top plate, the mounting plate is fixedly connected with a carrier for traction, and the top plate is kept in a horizontal state.

[0005] Specifically, side plates are fixedly installed at positions close to both sides of the bottom of the top plate, a circular hole is formed at a position close to the front end of the top plate, a front suspension rod is movably sleeved in the circular hole through a bearing, a front suspension wheel is fixedly installed at the bottom of the front suspension rod, a telescopic shaft sleeve is movably sleeved on the outer surface of the front suspension rod close to the top, a swing device is movably sleeved at the end of the telescopic shaft sleeve, a sensing device is movably sleeved at the end of the swing device, a contact device is fixedly installed at a position corresponding to the sensing device on the top of the top plate, a limiting device is movably sleeved at the end of the sensing device, and a matching bin is arranged at a position close to the end on the outer side of the side plate.

[0006] Further, the swing device comprises a power machine, the power machine is fixedly installed at the top of the top plate, an output shaft of the power machine penetrates through the top plate and extends below the top plate, a rotating disc is fixedly installed at one end of the output shaft of the power machine, and the power machine is in an open state and drives the rotating disc to be in a rotating state during the operation of the device.

[0007] Specifically, the first connecting shaft is fixedly installed at the position close to the outer side of the bottom of the rotating disc, the outer surface of the first connecting shaft movably sheaths the swing rod, the front side of the outer surface of the swing rod is fixedly installed with the telescopic rod, the rotating disc drives the swing rod to rotate synchronously in the process of rotation, and then drives the telescopic rod to swing left and right, and the front end of the telescopic rod does telescopic motion in the inside of the telescoping shaft sleeve.

[0008] Specifically, the telescopic rod is movably installed in the inside of the telescoping shaft sleeve, the rear side of the outer surface of the swing rod is fixedly installed with the fixed rod, the outer surface of the fixed rod movably sheaths the matching shaft sleeve through telescopic cooperation at the position close to the tail end, the inside of the matching shaft sleeve movably sheaths the telescopic tail shaft through telescopic cooperation, the tail end of the fixed rod is provided with a pressure sensor, the front end of the telescopic tail shaft is connected with the pressure sensor through a spring, the telescopic tail shaft moves backward when being pulled, so that the spring at the front end of the telescopic tail shaft is pulled, and the spring transmits the pulling force to the pressure sensor, and the pressure sensor can record the elastic force of the spring at any time.

[0009] Specifically, the tail end of the telescopic tail shaft is fixedly installed with the connecting shaft seat, and the sensing device movably sheaths the connecting shaft seat.

[0010] Further, the sensing device comprises a rotating seat, the rotating seat movably sheaths the connecting shaft seat, the rear side of the outer surface of the rotating seat is fixedly installed with a connecting rod, the tail end of the connecting rod is fixedly installed with a connecting shaft sleeve, the inside of the connecting shaft sleeve movably sheaths the limiting device through bearing connection, the outer surface of the connecting rod is fixedly installed with a contact seat at the position close to the middle, the outer surface of the connecting rod is fixedly installed with a current sensor at the positions close to the two ends, the bottom of the current sensor is fixedly installed with a sensing lead, and the current sensor can monitor the current intensity flowing in the sensing lead in real time.

[0011] Further, the contact device comprises a central control equipment, the bottom of the central control equipment is fixedly installed with an arc-shaped contact sensor at the position close to the rear side, and the bottom of the central control equipment is fixedly installed with a magnetic block at the position close to the front side.

[0012] Further, the magnetic block is made of a permanent magnet, and the magnetic pole faces the vertical direction, and the sensing lead cuts the magnetic induction lines of the magnetic block and generates an induced current in the process of longitudinal movement.

[0013] Specifically, the bottom of the arc-shaped contact sensor is in contact with the top of the contact seat in the initial state, and the arc-shaped contact sensor is recorded when it is out of contact with the contact seat.

[0014] Further, the output ends of the current sensor and the arc-shaped contact sensor are connected with the input end of the central control equipment in a data signal connection mode.

[0015] Further, the limiting device comprises a sliding block and a transverse sliding rail, the sliding block is movably sleeved with the connecting shaft sleeve, the bottom of the sliding block is fixedly installed with a second connecting shaft, the bottom of the second connecting shaft is fixedly installed with a rear suspension rod, the second connecting shaft is matched with the transverse sliding rail, and the two ends of the transverse sliding rail are movably installed with longitudinal sliding rods.

[0016] Specifically, a matching seat is fixedly installed on the position close to the top of the longitudinal sliding rod, an adjusting screw is sleeved with the matching seat at the top through a threaded matching mode, a load spring is clamped at the bottom of the adjusting screw outside the position, the load spring is in a compressed state in an initial state, when the bottom of the rear suspension rod contacts the pit on the runway, the elastic force of the load spring drives the longitudinal sliding rod to move downward through the matching seat, and the bottom of the rear suspension rod is quickly contacted with the bottom of the pit.

[0017] Specifically, the bottom of the load spring is clamped with the bottom of the inner wall of the matching bin, and the adjusting screw extends to the outside through the bottom of the inner wall of the matching bin.

[0018] The application has the following beneficial effects.

[0019] The device can drive the inductive device to swing through the swinging device, so that the detection range of the rear suspension rod is expanded, and the radial direction of the guide wheel below the rear suspension rod is always consistent with the advancing direction of the device in the process of swinging of the inductive device under the limiting action of the transverse sliding rail, so as to avoid deviation to cause the increase of resistance and result in inaccurate detection results. Meanwhile, the device can also detect the pit on the runway, and can remove the resistance fluctuation caused by the contact between the bottom guide wheel of the rear suspension rod and the pit on the runway from the normal detection data, so as to improve the accuracy of the final result. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of the specification, illustrate the embodiments of the present application and serve to explain the principles of the present application.

[0021] Referring to the drawings, the present disclosure can be more clearly understood in light of the following detailed description, in which:

[0022] Figure 1 is a structural schematic view of the application;

[0023] Figure 2 is a structural sectional view of the application;

[0024] Figure 3 is a local structural schematic view of the application;

[0025] Figure 4The structural swing device of the present application is shown in the figure.

[0026] Figure 5 The sectional view of the structural swing device of the present application is shown in the figure.

[0027] Figure 6 The structural swing device of the present application is shown in the figure.

[0028] Figure 7 The sectional view of the structural swing device of the present application is shown in the figure.

[0029] Figure 8 The structural swing device of the present application is shown in the figure.

[0030] In the figure, 1 is the top plate, 2 is the mounting plate, 3 is the side plate, 4 is the front suspension rod, 5 is the front suspension wheel, 6 is the telescopic shaft sleeve, 7 is the swing device, 71 is the power machine, 72 is the rotating disc, 73 is the first connecting shaft, 74 is the swing rod, 75 is the telescopic rod, 76 is the fixed rod, 77 is the matching shaft sleeve, 78 is the telescopic tail shaft, 79 is the pressure sensor, 701 is the connecting shaft seat, 8 is the sensing device, 81 is the rotating seat, 82 is the connecting rod, 83 is the connecting shaft sleeve, 84 is the contact seat, 85 is the current sensor, 86 is the sensing wire, 9 is the contact device, 91 is the central control equipment, 92 is the arc-shaped contact sensor, 93 is the magnetic block, 10 is the limiting device, 101 is the sliding block, 102 is the transverse sliding rail, 103 is the second connecting shaft, 104 is the rear suspension rod, 105 is the longitudinal sliding rod, 106 is the matching seat, 107 is the adjusting screw rod, 108 is the load spring, and 11 is the matching bin. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] An airport runway friction coefficient detection device, please refer to Figures 1-3 , including the top plate 1, the front end of the top plate 1 is fixedly installed with the mounting plate 2, the mounting plate 2 is fixedly connected with the carrier for traction, and the top plate 1 is kept in a horizontal state.

[0033] Please refer to Figures 1-3The side plate 3 is fixedly installed on the bottom of the top plate 1 near the two sides, a circular hole is formed on the top of the top plate 1 near the front end, a front suspension rod 4 is movably sleeved in the circular hole through a bearing, a front suspension wheel 5 is fixedly installed on the bottom of the front suspension rod 4, an extension shaft sleeve 6 is movably sleeved on the outer surface of the front suspension rod 4 near the top, an oscillating device 7 is movably sleeved at the end of the extension shaft sleeve 6, a sensing device 8 is movably sleeved at the end of the oscillating device 7, a contact device 9 is fixedly installed on the top of the top plate 1 corresponding to the sensing device 8, a limiting device 10 is movably sleeved at the end of the sensing device 8, and a matching bin 11 is arranged on the outer side of the side plate 3 near the end and matched with the limiting device 10.

[0034] Please refer to Figures 4-5 The oscillating device 7 comprises a power machine 71, the power machine 71 is fixedly installed on the top of the top plate 1, and the output shaft of the power machine 71 penetrates through the top plate 1 and extends below the top plate 1, one end of the output shaft of the power machine 71 is fixedly installed with a rotating disc 72, and the power machine 71 is in an open state and drives the rotating disc 72 to rotate during the operation of the device.

[0035] Please refer to Figure 2 and Figures 4-5 The rotating disc 72 is fixedly installed with a first connecting shaft 73 on the bottom near the outer side, the first connecting shaft 73 is movably sleeved with an oscillating rod 74 on the outer surface, the front side of the outer surface of the oscillating rod 74 is fixedly installed with an extension rod 75, the rotating disc 72 drives the oscillating rod 74 to rotate synchronously during the rotation of the rotating disc 72, thereby driving the extension rod 75 to swing left and right, and the front end of the extension rod 75 performs extension and contraction movement in the extension shaft sleeve 6.

[0036] Please refer to Figure 2 and Figures 4-5 The extension rod 75 is movably installed in the extension shaft sleeve 6, the rear side of the outer surface of the oscillating rod 74 is fixedly installed with a fixed rod 76, the outer surface of the fixed rod 76 is movably installed with a matching shaft sleeve 77 through a telescopic matching mode near the end, the matching shaft sleeve 77 is movably installed with a telescopic tail shaft 78 through a telescopic matching mode in the inside, the end of the fixed rod 76 is provided with a pressure sensor 79, the front end of the telescopic tail shaft 78 is connected with the pressure sensor 79 through a spring, the telescopic tail shaft 78 moves backward when subjected to traction, thereby pulling the spring at the front end of the telescopic tail shaft 78, and the spring transmits the pulling force to the pressure sensor 79, and the pressure sensor 79 can record the spring force at any time.

[0037] Please refer to Figures 4-5 The end of the telescopic tail shaft 78 is fixedly installed with a connecting shaft seat 701, and the sensing device 8 is movably sleeved with the connecting shaft seat 701.

[0038] Please refer to Figure 2 andFigures 4-7 The induction device 8 comprises a rotating seat 81 movably sleeved with the connecting shaft seat 701, a connecting rod 82 fixedly installed on the rear side of the outer surface of the rotating seat 81, a connecting shaft sleeve 83 fixedly installed at the end of the connecting rod 82, the connecting shaft sleeve 83 movably sleeved with the limiting device 10 through bearing connection, a contact seat 84 fixedly installed on the outer surface of the connecting rod 82 near the middle, current inductors 85 fixedly installed on the outer surface of the connecting rod 82 near both ends, and induction wires 86 fixedly installed at the bottom of the current inductors 85. The current inductors 85 can monitor the current intensity flowing through the induction wires 86 in real time.

[0039] Please refer to Figures 6-7 The contact device 9 comprises a central control device 91, an arc-shaped contact inductor 92 fixedly installed on the bottom of the central control device 91 near the rear side, and a magnetic block 93 fixedly installed on the bottom of the central control device 91 near the front side.

[0040] Please refer to Figures 4-7 The magnetic block 93 is made of a permanent magnet with a magnetic pole facing the vertical direction. The induction wires 86 cut the magnetic induction lines of the magnetic block 93 during the longitudinal movement and generate induced current.

[0041] Please refer to Figures 6-7 The bottom of the arc-shaped contact inductor 92 is in contact with the top of the contact seat 84 in the initial state. When the arc-shaped contact inductor 92 is separated from the contact seat 84, it will be recorded.

[0042] Please refer to Figures 6-7 The output ends of the current inductors 85 and the arc-shaped contact inductor 92 are connected to the input end of the central control device 91 through data signal connection.

[0043] When the contact seat 84 is separated from the arc-shaped contact inductor 92, the induction wires 86 also move synchronously relative to the magnetic block 93, thereby cutting the magnetic induction lines generated by the magnetic block 93, and then generating induced current in the induction wires 86. Since the current inductors 85 can detect the intensity of the induced current in the induction wires 86 at any time and feed back the data to the central control device 91, when the induced current intensity is large, it indicates that the recess through which the rear suspension rod 104 passes is deep, and when the induced current intensity is small, it indicates that the recess through which the rear suspension rod 104 passes is shallow. Maintenance personnel can determine whether repair is needed according to the data, thereby further improving the practicality of the device.

[0044] When the guide wheel at the bottom of the rear suspension rod 104 contacts the pit on the runway, the elastic force of the load spring 108 will cause the limit device 10 to move downward as a whole and make the guide wheel at the bottom of the rear suspension rod 104 connect with the bottom of the pit. At this time, the top plate 1 remains in a horizontal state, which makes the arc contact sensor 92 and the contact seat 84 in a disengaged state. The output end of the arc contact sensor 92 is connected to the input end of the central control device 91 through a data signal connection, and the arc contact sensor 92 will be recorded when it is disengaged from the contact seat 84, thereby eliminating the tension detected by the pressure sensor 79 during the disengagement of the arc contact sensor 92 from the contact seat 84, avoiding distortion of the data detected at this time and affecting the final detection result, thereby improving the reliability of the device.

[0045] See also Figure 8 The limiting device 10 includes a slider 101 and a transverse slide rail 102. The slider 101 is movably mounted on the connecting shaft sleeve 83. A second connecting shaft 103 is fixedly mounted on the bottom of the slider 101. A rear suspension rod 104 is fixedly mounted on the bottom of the second connecting shaft 103. The second connecting shaft 103 cooperates with the transverse slide rail 102. Longitudinal slide rods 105 are movably mounted at both ends of the transverse slide rail 102. The slider 101 can move along the extension direction of the transverse slide rail 102, and the transverse slide rail 102 can move along the extension direction of the longitudinal slide rod 105.

[0046] See also Figure 8 A matching seat 106 is fixedly installed on the outer side of the longitudinal slide bar 105 near the top, and an adjusting screw 107 is sleeved on the top of the matching seat 106 by threaded engagement. A load spring 108 is clamped on the bottom of the matching seat 106 at a position outside the adjusting screw 107. The load spring 108 is in a compressed state in the initial state. When the bottom of the rear suspension rod 104 contacts the pit on the runway, the elastic force of the load spring 108 will drive the longitudinal slide bar 105 to move downward through the matching seat 106, and make the bottom of the rear suspension rod 104 quickly contact the bottom of the pit.

[0047] See also Figure 1 and Figure 8 The bottom of the load spring 108 is engaged with the bottom of the inner wall of the matching chamber 11, and the adjusting screw 107 passes through the bottom of the inner wall of the matching chamber 11 and extends to the outside.

[0048] When the carrier pulls the device to drive on the runway, the power machine 71 is in operation at this time, and drives the rotating disc 72 to rotate, under the action of which the fixed rod 76 starts to swing left and right, and through the transmission effect of the sensing device 8, the sliding block 101 and the second connecting shaft 103 are synchronously swung, so that the rear suspension rod 104 is always in a state of left and right movement, which can detect a wider range on the runway during the driving process of the carrier, compared with the traditional detection equipment, the rear suspension rod 104 can only move along a straight line, and the detection range is too small, and the device involved in the present application file avoids this well, and the practicability of the device is improved.

[0049] Due to the limiting effect of the sliding block 101 on the transverse sliding rail 102, the rear suspension rod 104 cannot rotate along the axis of the second connecting shaft 103, and always keeps the radial direction of the bottom guide wheel of the rear suspension rod 104 in the same plane as the movement direction of the device, avoiding the radial direction of the bottom guide wheel of the rear suspension rod 104 from being turned to form an angle with the movement direction of the device during the left and right swinging of the second connecting shaft 103, which increases the friction between the rear suspension rod 104 and the runway, and adjusts the radial direction of the rear suspension rod 104, resulting in that the finally detected friction coefficient is greater than the actual friction coefficient, and the present application file avoids this well, and improves the accuracy of the device detection.

[0050] The initial state of the load spring 108 is in a compressed state, so that the rear suspension rod 104 can be more closely attached to the ground, especially during the process of passing through the pit, avoiding the problem that the rear suspension rod 104 is out of contact with the ground, resulting in a sudden decrease in friction and affecting the detection result, further improving the accuracy of the device, in addition, the rotatable adjusting screw 107 adjusts the distance between the matching seat 106 and the bottom inner wall of the matching warehouse 11, so as to change the elastic potential energy stored by the load spring 108, and further change the contact pressure between the rear suspension rod 104 and the ground, so as to simulate the influence of different loads on the friction between the rear suspension rod 104 and the ground, and improve the practicability of the device.

[0051] The use method of the present application is as follows:

[0052] During use, the mounting plate 2 is fixedly connected with the towing vehicle, when the vehicle drives the device to move on the runway, the power machine 71 is in a running state at this time, and drives the rotating disc 72 to rotate, under the action, the fixed rod 76 starts to swing left and right, through the transmission effect of the inductive device 8, the sliding block 101 and the second connecting shaft 103 are synchronously swung, so that the rear suspension rod 104 is always in a state of left and right movement, which can detect a wider range on the runway during the movement of the vehicle, and due to the limiting effect of the sliding block 101 on the transverse sliding rail 102, the rear suspension rod 104 cannot rotate along the axis of the second connecting shaft 103, and always keeps the radial direction of the bottom guide wheel of the rear suspension rod 104 in the same plane as the movement direction of the device, avoiding that during the left and right swinging of the second connecting shaft 103, the radial direction of the bottom guide wheel of the rear suspension rod 104 rotates to form an angle with the movement direction of the device, which increases the friction between the rear suspension rod 104 and the runway, and adjusts the radial direction of the rear suspension rod 104, resulting in that the finally detected friction coefficient is greater than the actual friction coefficient, and the present application file avoids this point well, the load spring 108 is in a compressed state in the initial state, so that the rear suspension rod 104 can be more closely attached to the ground, especially during the process of passing through the pit, avoiding the problem that the rear suspension rod 104 is separated from the ground to cause the friction to decrease suddenly and affect the detection result, further improving the accuracy of the device, in addition, the rotatable adjusting screw 107 adjusts the distance between the matching seat 106 and the inner wall bottom of the matching bin 11, so as to change the elastic potential energy stored by the load spring 108, and further change the contact pressure between the rear suspension rod 104 and the ground, so as to realize the simulation of the influence of the rear suspension rod 104 and the ground under different loads, when the bottom guide wheel of the rear suspension rod 104 contacts the pit on the runway, the elastic force of the load spring 108 will drive the limiting device 10 to move downward as a whole and make the bottom guide wheel of the rear suspension rod 104 contact the bottom of the pit, and the top plate 1 remains horizontal at this time, which makes the arc-shaped contact inductor 92 and the contact seat 84 in a separated state, the output ends of the arc-shaped contact inductor 92 are connected to the input end of the central control equipment 91 through a data signal connection, and the arc-shaped contact inductor 92 is separated from the contact seat 84, which is recorded, so as to realize the elimination of the tension detected by the pressure inductor 79 during the separation of the arc-shaped contact inductor 92 and the contact seat 84, avoiding the distortion of the detected data at this time to affect the final detection result, when the contact seat 84 and the arc-shaped contact inductor 92 are separated, the inductive wire 86 also moves synchronously relative to the magnetic block 93, so as to cut the magnetic induction lines generated by the magnetic block 93, and then generate an induced current in the inductive wire 86, and the current inductor 85 can detect the intensity of the induced current in the inductive wire 86 at any time and feed back the data to the central control equipment 91, when the induced current is relatively large,If the inductive current intensity is large, it indicates that the pit through which the rear suspension rod 104 passes is deep. If the inductive current intensity is small, it indicates that the pit through which the rear suspension rod 104 passes is shallow. The maintenance personnel can determine whether repair is needed according to the data.

Claims

1. An airport runway friction coefficient detection device, characterized by, The utility model provides a kind of front and rear suspension device, including top plate (1), the front end of the top plate (1) is fixedly installed with mounting plate (2), the bottom of the top plate (1) is fixedly installed with side plate (3) near the position of both sides, the top of the top plate (1) is equipped with round hole near the position of front end, and the inside of the round hole is movably sleeved with front suspension rod (4) by bearing, the bottom of the front suspension rod (4) is fixedly installed with front suspension wheel (5), the outer surface of the front suspension rod (4) is movably sleeved with telescopic shaft sleeve (6) near the position of top, the end of the telescopic shaft sleeve (6) is movably sleeved with swing device (7), the end of the swing device (7) is movably sleeved with sensing device (8), the top of the top plate (1) is fixedly installed with contact device (9) with the corresponding position of sensing device (8), the end of the sensing device (8) is movably sleeved with limiting device (10), the outer side of the side plate (3) is equipped with cooperation bin (11) near the position of end, the cooperation bin (11) is matched with limiting device (10), the swing device (7) includes power machine (71), the top of the top plate (1) is fixedly installed with power machine (71), and the output shaft of power machine (71) penetrates top plate (1) and extends to the below of top plate (1), one end of the output shaft of power machine (71) is fixedly installed with rotating disc (72), the bottom of rotating disc (72) is fixedly installed with first connecting shaft (73) near the position of outer side, the outer surface of first connecting shaft (73) is movably sleeved with swing rod (74), the outer surface of swing rod (74) is fixedly installed with telescopic rod (75) on the front side, the telescopic rod (75) is movably installed in the inside of telescopic shaft sleeve (6), the rear side of the outer surface of swing rod (74) is fixedly installed with fixed rod (76), the outer surface of fixed rod (76) is movably installed with cooperation shaft sleeve (77) by telescopic cooperation near the position of end, the inside of cooperation shaft sleeve (77) is movably installed with telescopic tail shaft (78) by telescopic cooperation, the end of fixed rod (76) is equipped with pressure sensor (79), the front end of telescopic tail shaft (78) is connected with pressure sensor (79) by spring, the end of telescopic tail shaft (78) is fixedly installed with connecting shaft seat (701), the sensing device (8) is movably sleeved with connecting shaft seat (701), the sensing device (8) includes rotating seat (81), the rotating seat (81) is movably sleeved with connecting shaft seat (701), the rear side of the outer surface of rotating seat (81) is fixedly installed with connecting rod (82), the end of connecting rod (82) is fixedly installed with connecting shaft sleeve (83), connecting shaft sleeve (83) is movably sleeved with limiting device (10) by bearing connection in the inside, the outer surface of connecting rod (82) is fixedly installed with contact seat (84) near the position of middle, the outer surface of connecting rod (82) is fixedly installed with current sensor (85) near the position of both ends, the bottom of current sensor (85) is fixedly installed with sensing wire (86),The limiting device (10) includes a sliding block (101) and a transverse sliding rail (102), the sliding block (101) is movably sleeved with a connecting shaft sleeve (83), the bottom of the sliding block (101) is fixedly installed with a second connecting shaft (103), the bottom of the second connecting shaft (103) is fixedly installed with a rear suspension rod (104), the second connecting shaft (103) is matched with the transverse sliding rail (102), both ends of the transverse sliding rail (102) are movably installed with longitudinal sliding rods (105), the outer side of the longitudinal sliding rod (105) is fixedly installed with a matching seat (106) near the top, the top of the matching seat (106) is sleeved with an adjusting screw rod (107) in a threaded matching mode, the bottom of the matching seat (106) is clamped with a load spring (108) at the position outside the adjusting screw rod (107), the bottom of the load spring (108) is clamped with the bottom of the inner wall of the matching bin (11), and the adjusting screw rod (107) penetrates the bottom of the inner wall of the matching bin (11) and extends to the outer side.

2. A device for detecting the friction coefficient of a runway according to claim 1, characterized in that, The contact device (9) comprises a central control device (91), an arc-shaped contact inductor (92) is fixedly installed on the bottom of the central control device (91) near the rear side, and a magnetic block (93) is fixedly installed on the bottom of the central control device (91) near the front side.

3. A device for detecting the friction coefficient of a runway according to claim 2, characterized in that, The magnetic block (93) is made of a permanent magnet and has a vertical magnetic pole, and the bottom of the arc-shaped contact inductor (92) is in contact with the top of a contact seat (84) in an initial state.

4. A device for detecting the friction coefficient of a runway according to claim 2, characterized in that, The output ends of the current inductor (85) and the arc-shaped contact inductor (92) are connected to the input end of the central control device (91) through data signal connection.

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