Friction coefficient detection device for airfield runway

Abstract

The invention relates to the technical field of runway detection, and discloses an airport runway friction coefficient detection device, which comprises a power machine, the power machine is fixedly mounted at the top of a top plate, and an output shaft of the power machine penetrates through the top plate and extends to the lower part of the top plate. A second connecting shaft is fixedly mounted at the position, close to the outer side, of the bottom of the rotating disc, the outer surface of the second connecting shaft is movably sleeved with a swing rod, and a telescopic rod is fixedly mounted on the front side of the outer surface of the swing rod. When a carrier pulls the device to run along a runway, a power machine is in a running state at the moment and drives a rotating disc to rotate, a fixed rod starts to swing left and right under the action, and a sliding block and a second connecting shaft are driven to synchronously swing under the transmission effect of a sensing device, so that a rear suspension rod is always in a left-right moving state; and a wider range on the runway can be detected in the driving process of the carrier, so that the practicability of the device is improved.

Description

Technical Field

[0001] The present application relates to the field of runway detection technology, and in particular to a device for detecting the friction coefficient of an airport runway. Background Art

[0002] Airport runways are important facilities for aircraft takeoff and landing. The friction coefficient of the runway surface directly affects the takeoff and landing performance of the aircraft. When the friction coefficient is too high, the engine needs to be at a higher power when the aircraft takes off, resulting in too high fuel consumption. When the friction coefficient is too low, the aircraft speed decreases too slowly after landing, resulting in the need to extend the runway length to ensure the safety of the aircraft landing. Therefore, in order to ensure that the friction coefficient of the aircraft runway surface is within an appropriate range, it is necessary to detect the friction coefficient of the runway. During use, the detection range of traditional detection devices is too small and narrow, and multiple reciprocating detections are required on the runway, which increases the detection cost and difficulty. In this regard, the present application document proposes an airport runway friction coefficient detection device to solve the above-mentioned problems. Summary of the invention

[0003] The present application proposes an airport runway friction coefficient detection device, which has the advantage of expanding the detection range by swinging, and is used to solve the problem that the detection range of traditional equipment is narrow, resulting in the need for multiple reciprocating detections.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution: an airport runway friction coefficient detection device, comprising a top plate, a mounting plate fixedly installed at the front end of the top plate, the mounting plate being fixedly connected to a vehicle for traction and keeping the top plate in a horizontal state.

[0005] Specifically, side panels are fixedly installed on the bottom of the top plate near both sides, a circular hole is opened on the top of the top plate near the front end, and a front suspension rod is provided inside the circular hole through a bearing movable sleeve, a front suspension wheel is fixedly installed on the bottom of the front suspension rod, a telescopic sleeve is provided on the movable sleeve on the outer surface of the front suspension rod near the top, a swing device is provided on the end movable sleeve of the telescopic sleeve, a sensing device is provided on the end movable sleeve of the swing device, a contact device is fixedly installed on the top of the top plate at a position corresponding to the sensing device, a limiting device is provided on the end movable sleeve of the sensing device, and a matching bin is provided on the outer side of the side plate near the end, and the matching bin matches the limiting device.

[0006] Furthermore, the swing device includes a power machine, which is fixedly installed on the top of the top plate, and the output shaft of the power machine passes through the top plate and extends to the bottom of the top plate. A rotating disk is fixedly installed on one end of the output shaft of the power machine. During the operation of the device, the power machine is in an open state and drives the rotating disk to be in a rotating state.

[0007] Specifically, a second connecting shaft is fixedly installed at a position near the outer side of the bottom of the rotating disk, a swing rod is movablely sleeved on the outer surface of the second connecting shaft, and a telescopic rod is fixedly installed on the front side of the outer surface of the swing rod. The rotation of the rotating disk will drive the swing rod to rotate synchronously, and then drive the telescopic rod to swing left and right, and at the same time, the front end of the telescopic rod performs telescopic movement inside the telescopic shaft sleeve.

[0008] Specifically, the telescopic rod is movably installed inside the telescopic sleeve, a fixed rod is fixedly installed on the rear side of the outer surface of the swing rod, a matching sleeve is movably installed on the outer surface of the fixed rod near the end by means of telescopic cooperation, a telescopic tail shaft is movably installed inside the matching sleeve by means of telescopic cooperation, a pressure sensor is provided at the end of the fixed rod, and the front end of the telescopic tail shaft is connected to the pressure sensor by a spring. When the telescopic tail shaft is pulled, it moves backward, thereby pulling the spring at the front end of the telescopic tail shaft, and at the same time the spring transmits the pulling force to the pressure sensor, and the pressure sensor can record the elastic force of the spring at all times.

[0009] Specifically, a coupling seat is fixedly installed at the end of the telescopic tail shaft, and the sensing device is movably sleeved with the coupling seat.

[0010] Furthermore, the sensing device includes a rotating seat, which is movably mounted on the coupling seat, a connecting rod is fixedly installed on the rear side of the outer surface of the rotating seat, a connecting sleeve is fixedly installed on the end of the connecting rod, the interior of the connecting sleeve is movably mounted on the limit device through a bearing connection, a contact seat is fixedly installed on the outer surface of the connecting rod near the middle, current sensors are fixedly installed on the outer surface of the connecting rod near both ends, a sensing wire is fixedly installed on the bottom of the current sensor, and the current sensor can monitor the current intensity flowing in the sensing wire in real time.

[0011] Furthermore, the contact device includes a central control device, an arc-shaped contact sensor is fixedly installed at a position near the rear side of the bottom of the central control device, and a magnetic block is fixedly installed at a position near the front side of the bottom of the central control device.

[0012] Furthermore, the material of the magnetic block is a permanent magnet with its magnetic pole facing the vertical direction, and the induction wire will cut the magnetic flux lines of the magnetic block and generate an induced current during the longitudinal movement.

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

[0014] Furthermore, the output ends of the current sensor and the arc contact sensor are connected to the input end of the central control device by means of data signal connection.

[0015] Furthermore, the limiting device includes a slider and a transverse slide rail, the slider is movably mounted on the connecting shaft sleeve, a second connecting shaft is fixedly mounted on the bottom of the slider, a rear suspension rod is fixedly mounted on the bottom of the second connecting shaft, the second connecting shaft cooperates with the transverse slide rail, longitudinal slide rods are movably mounted on both ends of the transverse slide rail, the slider can move along the extension direction of the transverse slide rail, and the transverse slide rail can move along the extension direction of the longitudinal slide rod.

[0016] Specifically, a matching seat is fixedly installed on the outer side of the longitudinal slide bar near the top, and an adjusting screw is sleeved on the top of the matching seat by means of threaded matching. A load spring is clamped on the bottom of the matching seat at a position outside the adjusting screw. 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 slide bar to move downward through the matching seat, and makes the bottom of the rear suspension rod quickly contact the bottom of the pit.

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

[0018] This application has the following beneficial effects.

[0019] The device can drive the sensing device to swing through the swing device, so that the detection range of the rear suspension rod is expanded, and under the limiting action of the transverse slide rail, the radial direction of the guide wheel below the rear suspension rod will always be consistent with the forward direction of the device during the swinging of the sensing device, avoiding deviation and increasing resistance, resulting in inaccurate detection results. At the same time, the device can also detect pits on the runway at the same time, and can exclude resistance fluctuations caused by the contact between the guide wheel at the bottom of the rear suspension rod and the pits on the runway from normal detection data, thereby improving the accuracy of the final result. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0021] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the structure of the present invention; Figure 3 It is a partial schematic diagram of the structure of the present invention; Figure 4 It is a schematic diagram of the structural swing device of the present invention; Figure 5 It is a cross-sectional view of the structural swing device of the present invention; Figure 6 It is a schematic diagram of the structural sensing device and contact device of the present invention; Figure 7 It is a cross-sectional view of the structural sensing device and the contact device of the present invention; Figure 8 This is a diagram of the structural limiting device of the present invention.

[0022] In the figure, 1, top plate; 2, mounting plate; 3, side plate; 4, front suspension rod; 5, front suspension wheel; 6, telescopic sleeve; 7, swing device; 71, power machine; 72, rotating plate; 73, second connecting shaft; 74, swing rod; 75, telescopic rod; 76, fixed rod; 77, matching sleeve; 78, telescopic tail shaft; 79, pressure sensor; 701, coupling seat; 8, sensing device; 81, rotating seat; 82, connecting rod; 83 , connecting sleeve; 84, contact seat; 85, current sensor; 86, sensing wire; 9, contact device; 91, central control equipment; 92, arc contact sensor; 93, magnetic block; 10, limit device; 101, slider; 102, horizontal slide rail; 103, second connecting shaft; 104, rear suspension rod; 105, longitudinal slide rod; 106, matching seat; 107, adjusting screw; 108, load spring; 11, matching bin. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] A device for detecting friction coefficient of airport runway, please refer to Figure 1-Figure 3 , including a top plate 1, a mounting plate 2 is fixedly mounted on the front end of the top plate 1, the mounting plate 2 is fixedly connected to a vehicle for traction, and keeps the top plate 1 in a horizontal state.

[0025] See also Figure 1-Figure 3A side plate 3 is fixedly installed at the bottom of the top plate 1 near the two sides, a round hole is opened at the top of the top plate 1 near the front end, and a front suspension rod 4 is provided inside the round hole through a bearing movable sleeve, a front suspension wheel 5 is fixedly installed at the bottom of the front suspension rod 4, a telescopic sleeve 6 is provided at the movable sleeve near the top of the outer surface of the front suspension rod 4, a swing device 7 is provided at the end movable sleeve of the telescopic sleeve 6, a sensing device 8 is provided at the end movable sleeve of the swing device 7, a contact device 9 is fixedly installed at the top of the top plate 1 corresponding to the sensing device 8, a limiting device 10 is provided at the end movable sleeve of the sensing device 8, and a matching bin 11 is provided at the outer side of the side plate 3 near the end, and the matching bin 11 matches the limiting device 10.

[0026] See also Figure 4-Figure 5 The swing device 7 includes a power machine 71, which is fixedly mounted on the top of the top plate 1, and the output shaft of the power machine 71 passes through the top plate 1 and extends to the bottom of the top plate 1. A rotating disk 72 is fixedly mounted on one end of the output shaft of the power machine 71. During the operation of the device, the power machine 71 is in an open state and drives the rotating disk 72 to rotate.

[0027] See also Figure 2 and Figure 4-Figure 5 A second connecting shaft 73 is fixedly installed at a position near the outer side of the bottom of the rotating disk 72. A swing rod 74 is movably sleeved on the outer surface of the second connecting shaft 73. A telescopic rod 75 is fixedly installed on the front side of the outer surface of the swing rod 74. During the rotation of the rotating disk 72, the swing rod 74 will be driven to rotate synchronously, thereby driving the telescopic rod 75 to swing left and right. At the same time, the front end of the telescopic rod 75 performs telescopic movement inside the telescopic shaft sleeve 6.

[0028] See also Figure 2 and Figure 4-Figure 5 The telescopic rod 75 is movably installed inside the telescopic sleeve 6, and a fixed rod 76 is fixedly installed on the rear side of the outer surface of the swing rod 74. A matching sleeve 77 is movably installed on the outer surface of the fixed rod 76 near the end by a telescopic fit. A telescopic tail shaft 78 is movably installed inside the matching sleeve 77 by a telescopic fit. A pressure sensor 79 is provided at the end of the fixed rod 76, and the front end of the telescopic tail shaft 78 is connected to the pressure sensor 79 through a spring. When the telescopic tail shaft 78 is pulled, it will move backward, thereby pulling the spring at the front end of the telescopic tail shaft 78. At the same time, the spring transmits the pulling force to the pressure sensor 79, and the pressure sensor 79 can record the elastic force of the spring at all times.

[0029] See also Figure 4-Figure 5 A coupling seat 701 is fixedly installed at the end of the telescopic tail shaft 78, and the sensing device 8 is movably sleeved with the coupling seat 701.

[0030] See also Figure 2 and Figure 4-Figure 7 The sensing device 8 includes a rotating seat 81, which is movably mounted on the coupling seat 701. A connecting rod 82 is fixedly mounted on the rear side of the outer surface of the rotating seat 81. A connecting shaft sleeve 83 is fixedly mounted on the end of the connecting rod 82. The interior of the connecting shaft sleeve 83 is movably mounted on the limit device 10 through a bearing connection. A contact seat 84 is fixedly mounted on the outer surface of the connecting rod 82 near the middle. Current sensors 85 are fixedly mounted on the outer surface of the connecting rod 82 near both ends. A sensing wire 86 is fixedly mounted on the bottom of the current sensor 85. The current sensor 85 can monitor the current intensity flowing in the sensing wire 86 in real time.

[0031] See also Figure 6-Figure 7 The contact device 9 includes a central control device 91 , an arc-shaped contact sensor 92 is fixedly installed at a position near the rear side of the bottom of the central control device 91 , and a magnetic block 93 is fixedly installed at a position near the front side of the bottom of the central control device 91 .

[0032] See also Figure 4-Figure 7 The material of the magnetic block 93 is a permanent magnet with its magnetic pole facing the vertical direction. The induction wire 86 will cut the magnetic flux lines of the magnetic block 93 and generate an induced current during the longitudinal movement.

[0033] See also Figure 6-Figure 7 In the initial state, the bottom of the arc-shaped contact sensor 92 is in contact with the top of the contact seat 84, and the arc-shaped contact sensor 92 will be recorded when it is out of contact with the contact seat 84.

[0034] See also Figure 6-Figure 7 The output ends of the current sensor 85 and the arc contact sensor 92 are connected to the input end of the central control device 91 through data signal connection.

[0035] When the contact seat 84 is disengaged from the arc-shaped contact sensor 92, the sensing wire 86 will also move synchronously relative to the magnetic block 93, thereby cutting the magnetic flux lines generated by the magnetic block 93, and then generating an induced current inside the sensing wire 86. Since the current sensor 85 can detect the intensity of the induced current inside the sensing wire 86 at all times and feed back the data to the central control device 91, when the induced current intensity is large, it means that the pit passed by the rear suspension rod 104 is deep, and when the induced current intensity is small, it means that the pit passed by the rear suspension rod 104 is shallow. The maintenance personnel can judge whether repair is needed based on the data, which further improves the practicality of the device.

[0036] 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 drive 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 horizontal, 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.

[0037] 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 on 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.

[0038] 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 matching. 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 drives the longitudinal slide bar 105 to move downward through the matching seat 106, and makes the bottom of the rear suspension rod 104 quickly contact the bottom of the pit.

[0039] 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.

[0040] When the vehicle tows the device along the runway, the power machine 71 is in operation and drives the rotating disk 72 to rotate. Under this action, the fixed rod 76 begins to swing left and right. Through the transmission effect of the sensing device 8, the slider 101 and the second connecting shaft 103 are driven to swing synchronously, so that the rear suspension rod 104 is always in a state of moving left and right, and a wider range on the runway can be detected during the driving of the vehicle. Compared with traditional detection equipment, the rear suspension rod 104 can only move in a straight line, and the detection range is too small. The device involved in the present application document avoids this problem well, thereby improving the practicality of the device.

[0041] Due to the limiting effect of the slider 101 on the transverse slide rail 102, the rear suspension rod 104 cannot rotate along the axis of the second connecting shaft 103, and the radial direction of the guide wheel at the bottom of the rear suspension rod 104 is always kept in the same plane as the movement direction of the device, so as to avoid the second connecting shaft 103 swinging left and right, and the radial direction of the guide wheel at the bottom of the rear suspension rod 104 rotates, causing an angle between the radial direction and the movement direction of the device, which increases the friction between the rear suspension rod 104 and the runway, and normalizes the radial direction of the rear suspension rod 104, resulting in the final detected friction coefficient being greater than the actual friction coefficient. The present application document avoids this problem well, and improves the detection accuracy of the device.

[0042] By initially compressing the load spring 108, the rear suspension rod 104 can fit more closely to the ground, especially when passing through a pit, thereby avoiding the problem of the rear suspension rod 104 losing contact with the ground, causing a sudden drop in friction and affecting the detection result, further improving the accuracy of the device. In addition, the adjusting screw 107 can be rotated to adjust the distance between the matching seat 106 and the bottom of the inner wall of the matching chamber 11, thereby changing the elastic potential energy stored in the load spring 108, and then changing the contact pressure between the rear suspension rod 104 and the ground, thereby simulating the impact of different loads on the friction between the rear suspension rod 104 and the ground, thereby improving the practicability of the device.

[0043] The method of use of the present invention is as follows: During use, the mounting plate 2 is fixedly connected to the towed vehicle. When the vehicle tows the device along the runway, the power machine 71 is in operation and drives the rotating disk 72 to rotate. Under this action, the fixed rod 76 starts to swing left and right. Through the transmission effect of the sensing device 8, the slider 101 and the second connecting shaft 103 are driven to swing synchronously, so that the rear suspension rod 104 is always in a state of moving left and right, and a wider range on the runway can be detected during the driving of the vehicle. Because the slider 101 is limited by the transverse slide rail 102, the rear suspension rod 104 cannot rotate along the axis of the second connecting shaft 103, and the radial direction of the guide wheel at the bottom of the rear suspension rod 104 is always kept in line with the movement direction of the device. The rear suspension rod 104 is always kept in the same plane, and the second connecting shaft 103 is not allowed to swing left and right. The guide wheel at the bottom of the rear suspension rod 104 rotates, causing an angle between the radial direction and 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 the friction coefficient finally detected being greater than the actual friction coefficient. The present application document avoids this problem very well. The load spring 108 is in a compressed state in the initial state, so that the rear suspension rod 104 can fit more closely to the ground, especially in the process of passing through a pit, avoiding the problem that the rear suspension rod 104 is out of contact with the ground, causing a sudden decrease in friction and affecting the detection result, and further improving the accuracy of the device. In addition, the adjusting screw 107 can be rotated to adjust the distance between the matching seat 106 and the bottom of the inner wall of the matching chamber 11, thereby changing the elastic potential energy stored in the load spring 108, and then changing the contact pressure between the rear suspension rod 104 and the ground, so as to simulate the influence of the friction between 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 connect with the bottom of the pit, while the top plate 1 keeps a horizontal state at this time, which makes the arc contact sensor 92 and the contact seat 84 in a disengaged state, and the output end of the arc contact sensor 92 is connected to the data signal. The arc contact sensor 92 is connected to the input end of the central control device 91 in a connected manner, and the arc contact sensor 92 will be recorded when it is out of contact with the contact seat 84, so as to eliminate the pulling force detected by the pressure sensor 79 during the separation of the arc contact sensor 92 from the contact seat 84, so as to avoid the distortion of the data detected at this time and thus affect the final detection result. When the contact seat 84 is separated from the arc contact sensor 92, the sensing wire 86 will also move synchronously relative to the magnetic block 93, so as to cut the magnetic flux generated by the magnetic block 93, and then generate an induced current inside the sensing wire 86. Since the current sensor 85 can detect the intensity of the induced current inside the sensing wire 86 at any time and feed back the data to the central control device 91, when the induced current intensity is large,If the induced current intensity is small, it means that the pit through which the rear suspension rod 104 passes is deep. If the induced current intensity is small, it means that the pit through which the rear suspension rod 104 passes is shallow. The maintenance personnel can judge whether repair is needed according to the data.

Claims

1. An airport runway friction coefficient detection device, characterized in that: The invention comprises a top plate (1), a mounting plate (2) being fixedly mounted on the front end of the top plate (1), side plates (3) being fixedly mounted on the bottom of the top plate (1) near both sides, a round hole being opened on the top of the top plate (1) near the front end, and a front suspension rod (4) being arranged inside the round hole through a bearing movable sleeve, a front suspension wheel (5) being fixedly mounted on the bottom of the front suspension rod (4), a telescopic shaft sleeve (6) being arranged on the movable sleeve at a position near the top of the outer surface of the front suspension rod (4), a swing device (7) being arranged on the end movable sleeve of the telescopic shaft sleeve (6), a sensing device (8) being arranged on the end movable sleeve of the swing device (7), a contact device (9) being fixedly mounted on the top of the top plate (1) at a position corresponding to the sensing device (8), a limit device (10) being arranged on the end movable sleeve of the sensing device (8), and a matching bin (11) being arranged on the outer side of the side plate (3) near the end, the matching bin (11) matching with the limit device (10).

2. The device for detecting friction coefficient of an airport runway according to claim 1, characterized in that: The swing device (7) comprises a power machine (71), the power machine (71) being fixedly mounted on the top of the top plate (1), and the output shaft of the power machine (71) passing through the top plate (1) and extending to the bottom of the top plate (1), a rotating disk (72) being fixedly mounted on one end of the output shaft of the power machine (71), a second connecting shaft (73) being fixedly mounted at a position close to the outer side of the bottom of the rotating disk (72), a swing rod (74) being movably sleeved on the outer surface of the second connecting shaft (73), a telescopic rod (75) being fixedly mounted on the front side of the outer surface of the swing rod (74), and the telescopic rod (75) being movably mounted on the inner surface of the telescopic shaft sleeve (6). A fixing rod (76) is fixedly mounted on the rear side of the outer surface of the swing rod (74); a matching shaft sleeve (77) is movably mounted on the outer surface of the fixing rod (76) near the end thereof in a telescopic manner; a telescopic tail shaft (78) is movably mounted inside the matching shaft sleeve (77) in a telescopic manner; a pressure sensor (79) is provided at the end of the fixing rod (76); a front end of the telescopic tail shaft (78) is connected to the pressure sensor (79) via a spring; a coupling seat (701) is fixedly mounted on the end of the telescopic tail shaft (78); and the sensing device (8) is movably sleeved with the coupling seat (701).

3. The device for detecting friction coefficient of an airport runway according to claim 2, characterized in that: The sensing device (8) comprises a rotating seat (81), the rotating seat (81) being movably sleeved with the coupling seat (701), a connecting rod (82) being fixedly mounted on the rear side of the outer surface of the rotating seat (81), a connecting shaft sleeve (83) being fixedly mounted on the end of the connecting rod (82), the interior of the connecting shaft sleeve (83) being movably sleeved with the limit device (10) by means of a bearing connection, a contact seat (84) being fixedly mounted on the outer surface of the connecting rod (82) at a position close to the middle, current sensors (85) being fixedly mounted on the outer surface of the connecting rod (82) at positions close to both ends, and a sensing wire (86) being fixedly mounted on the bottom of the current sensor (85).

4. The device for detecting friction coefficient of an airport runway according to claim 3, characterized in that: The contact device (9) comprises a central control device (91), an arc-shaped contact sensor (92) is fixedly mounted at a position near the rear side of the bottom of the central control device (91), and a magnetic block (93) is fixedly mounted at a position near the front side of the bottom of the central control device (91).

5. The device for detecting friction coefficient of an airport runway according to claim 4, characterized in that: The material of the magnetic block (93) is a permanent magnet with its magnetic pole facing in a vertical direction. In an initial state, the bottom of the arc-shaped contact sensor (92) contacts the top of the contact seat (84).

6. The device for detecting friction coefficient of an airport runway according to claim 5, characterized in that: The output ends of the current sensor (85) and the arc contact sensor (92) are connected to the input end of the central control device (91) by means of data signal connection.

7. The device for detecting friction coefficient of an airport runway according to claim 6, characterized in that: The limiting device (10) comprises a slider (101) and a transverse slide rail (102); the slider (101) is movably mounted on a 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 on both ends of the transverse slide rail (102); A mating seat (106) is fixedly installed at a position near the top of the outer side of the slide rod (105); an adjusting screw (107) is sleeved on the top of the mating seat (106) by means of threaded engagement; a load spring (108) is clamped at a position outside the adjusting screw (107) at the bottom of the mating seat (106); the bottom of the load spring (108) is clamped with the bottom of the inner wall of the mating bin (11); and the adjusting screw (107) passes through the bottom of the inner wall of the mating bin (11) and extends to the outside.

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