Road surface friction coefficient measuring vehicle for airport engineering

Abstract

The utility model discloses a road surface friction coefficient measuring vehicle for airport engineering, which comprises a vehicle frame, central shafts are arranged at the front part and the rear part of the lower part of the vehicle frame, and traveling wheels are arranged at the two ends of each central shaft; a driving and measuring assembly and a braking mechanism are further arranged on the frame, the driving and measuring assembly can control the walking wheels to rotate and measure physical parameters, and the braking mechanism is arranged above the center shaft and can control the walking wheels to stop rotating; the braking mechanism is arranged, braking can be conducted when the speed of the device is equal to the preset speed, the walking wheels are forced to stop rotating, the actual landing condition of the civil aviation passenger plane is met, the friction coefficient between the device and the road surface at the moment is obtained, and the accuracy of friction coefficient measurement is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of friction coefficient measurement, in particular to a road surface friction coefficient measuring vehicle for airport engineering. Background Art

[0002] With the rapid development of transportation, almost every city will build an airport, which provides great convenience for people to travel long distances by civil aviation. In order to improve the safety of civil aviation operations, measures need to be taken in many aspects. For example, when building an airport, it is necessary to build an airport road surface with a large enough friction coefficient to provide safety for civil aviation landing and parking.

[0003] In order to provide qualified airports and find problems in time, it is necessary to measure the friction coefficient of the airport pavement during airport acceptance. There are many devices for measuring the friction coefficient of the pavement. For example, a Chinese patent with patent publication number CN216696018U discloses an airport pavement friction coefficient measuring vehicle, which includes a bottom plate, two sets of rear wheels, a worm gear, a motor, a worm, two sets of first columns, a car plate, a block, two sets of first springs, two sets of first slide bars, two sets of axle seats, a second wheel axle, two sets of front wheels, two sets of second columns, a support plate, two sets of second springs, a baffle, two sets of second slide bars, a push rod, a slide plate, a third spring, a speed measuring assembly and a counterweight assembly.

[0004] When using the device provided by the above patent to measure the friction coefficient of the airport road surface, it is necessary to travel at a constant speed so that the device maintains a force balance. Although this method can obtain the friction coefficient, it is different from the actual situation when a civil airliner lands. Because when a civil airliner lands, it controls the wheels to stop rotating through a braking mechanism to achieve the parking of the civil airliner, while the device of the above patent cannot control the wheels to stop rotating, and the friction coefficient measured is not accurate enough. Utility Model Content

[0005] The utility model aims to provide a road friction coefficient measuring vehicle for airport engineering, aiming to improve the problem that the existing friction coefficient measuring device is not consistent with the actual landing situation of civil aviation passenger aircraft and the measured data is not accurate enough.

[0006] The utility model is implemented as follows: a road friction coefficient measuring vehicle for airport engineering includes a vehicle frame, a central axis is arranged at the front and rear of the lower part of the vehicle frame, and running wheels are arranged at both ends of the central axis; a driving measurement component and a braking mechanism are also arranged on the vehicle frame, the driving measurement component can control the rotation of the running wheel and measure physical parameters, and the braking mechanism is arranged above the central axis and can control the running wheel to stop rotating.

[0007] Preferably, the braking mechanism includes a fixed plate, a brake plate and an electric cylinder. The brake plate is arranged below the fixed plate. The electric cylinder is fixedly arranged on the lower side of the fixed plate, and the telescopic end is connected to the fixed plate. A limiting rod is also arranged above the brake plate, and the upper end of the limiting rod passes through the fixed plate.

[0008] Preferably, two groups of brake mechanisms are provided, which are respectively arranged at the front and rear ends of the vehicle frame, and the brake plate can be sleeved on the central axis.

[0009] Preferably, the driving measurement assembly includes a motor, a driving gear and a driven gear, the driving gear is arranged on the output shaft of the motor, and the driven gear is sleeved on a certain central shaft and can be meshed and connected with the driving gear.

[0010] Preferably, the driving gear is arranged on a support frame, and the support frame includes a horizontal plate, a threaded rod, a common plate and two vertical plates. The two vertical plates are arranged at both ends of the common plate, and the upper ends of the two vertical plates are distributed on both sides of the horizontal plate. The threaded rod is arranged below the horizontal plate, and the end is connected to the motor, and the thread is arranged through the common plate.

[0011] Preferably, a clamping groove is provided on the side wall of the horizontal plate, and clamping columns are provided on the upper ends of the two vertical plates close to the side walls, and the clamping columns are located in the clamping groove.

[0012] Preferably, a distance measuring mechanism is provided at the end of the support frame, and the distance measuring mechanism includes a measuring wheel, an angle sensor and two support plates, the upper ends of the two support plates are connected to the support frame and are distributed on both sides of the measuring wheel, and the end shaft of the measuring wheel passes through the support plate and is connected to the angle sensor.

[0013] Preferably, a speed measuring mechanism is also provided below the support frame, the speed measuring mechanism comprises a connecting pipe and a vehicle speed sensor, the upper end of the vehicle speed sensor can be threadedly inserted into the connecting pipe, the upper end of the connecting pipe is connected to the cross plate, and a through hole is provided at the top.

[0014] Preferably, a processor is arranged above the transverse plate, a display screen is arranged on the vehicle frame, and the processor is electrically connected to the display screen, the motor, the vehicle speed sensor and the angle sensor.

[0015] Preferably, a support plate is provided on the vehicle frame, a limiting column is threadedly inserted on the upper side of the support plate, the limiting column passes through a counterweight block, and a battery is embedded on the counterweight block.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model is provided with a braking mechanism, which can brake when the speed of the device is equal to a preset speed, forcing the running wheels to stop rotating, which is more in line with the actual situation of civil aviation passenger aircraft landing, and the friction coefficient between the device and the road surface at this time is obtained, thereby improving the accuracy of friction coefficient measurement.

[0018] 2. The utility model is provided with a threaded rod, which can control the driving gear to move away from the driven gear when the device reaches a preset speed, so as to promptly and quickly remove the power for moving the device and reduce the influence of the motor on the driving of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0020] Figure 2 This utility model Figure 1 Schematic diagram of the three-dimensional structure of the CRRC frame;

[0021] Figure 3 This utility model Figure 1 A schematic diagram of the three-dimensional structure of the middle drive measurement component;

[0022] Figure 4 This utility model Figure 3 A schematic diagram of the three-dimensional structure of the middle support frame;

[0023] Figure 5 This utility model Figure 3 A schematic diagram of the three-dimensional structure of the medium-speed measurement mechanism;

[0024] Figure 6 This utility model Figure 3 A schematic diagram of the three-dimensional structure of the mid-range measuring mechanism;

[0025] Figure 7 This utility model Figure 1 A three-dimensional structural diagram of the CRRC frame and brake mechanism;

[0026] Figure 8 This utility model Figure 7 Schematic diagram of the three-dimensional structure of the brake mechanism.

[0027] In the figure: 1. frame; 11. display screen; 12. counterweight; 13. limiting column; 14. support plate; 15. central axis; 16. walking wheel; 2. drive measurement component; 21. processor; 22. drive gear; 23. driven gear; 3. distance measurement mechanism; 31. angle sensor; 32. measuring wheel; 33. support plate; 4. support frame; 41. cross plate; 42. threaded rod; 43. slot; 44. vertical plate; 45. joint plate; 46. column; 5. speed measurement mechanism; 51. connecting pipe; 52. through hole; 53. vehicle speed sensor; 6. brake mechanism; 61. brake plate; 62. limiting rod; 63. electric cylinder; 64. fixing plate. DETAILED DESCRIPTION

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0030] Example 1

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, a road friction coefficient measuring vehicle for airport engineering includes a vehicle frame 1 and a driving measurement component 2. The vehicle frame 1 is set as a rectangular structure, and a central axis 15 is set at the front and rear of the lower part of the vehicle frame 1, and a running wheel 16 is set at both ends of the central axis 15. A display screen 11 is set on the vehicle frame 1. The driving measurement component 2 includes a motor, a driving gear 22, a driven gear 23, a support frame 4, a distance measurement mechanism 3 and a speed measurement mechanism 5. The driving gear 22 is set on the support frame 4 and connected to the output shaft of the motor, and the support frame 4 can adjust the position of the driving gear 22. The driven gear 23 is sleeved on a certain central axis 15 and can mesh with the driving gear 22. The distance measurement mechanism 3 is set at the end of the support frame 4 and contacts the road surface. The vehicle speed sensor 53 is set below the support frame 4 and faces the central axis 15. In addition, a processor 21 is set above the support frame 4, and the processor 21 is electrically connected to the display screen 11, the motor, the vehicle speed sensor 53 and the distance measurement mechanism 3. When using the device to measure the friction coefficient of the airport pavement, the device is placed on the ground, and the program for the device to run is set by touching the display screen 11. After the program is set, the processor 21 controls the motor to work, thereby forcing the walking wheel 16 to rotate, driving the device to move on the airport pavement. At the same time, the vehicle speed sensor 53 and the distance measuring mechanism 3 respectively measure the speed and travel distance of the device in real time. When the speed of the device reaches the preset value, the driving gear 22 moves out of the connection with the driven gear 23. Thereafter, the device decelerates under the action of friction until it stops. After the device stops moving, the staff touches the display screen 11 to retrieve the distance parameter traveled after the vehicle speed reaches the preset value, and uses The formula is used to obtain the magnitude of the friction force suffered by the device after losing power, and then the friction coefficient u is obtained using the formula F=umg. The above formula is a common physics formula and will not be described in detail here.

[0032] like Figure 4 As shown, in order to lose power when the device reaches a preset speed and reduce the influence of the motor on the running of the device, the support frame 4 includes a horizontal plate 41, a threaded rod 42, a common plate 45 and two vertical plates 44. The two vertical plates 44 are arranged at both ends of the common plate 45. The upper ends of the two vertical plates 44 close to the side walls are provided with a clamping column 46, and the upper ends of the two vertical plates 44 are distributed on both sides of the horizontal plate 41. A clamping groove 43 is arranged on the side wall of the horizontal plate 41. The central angle of the clamping groove 43 is greater than 180°. The clamping column 46 is located in the clamping groove 43. The threaded rod 42 is arranged below the horizontal plate 41, and the end is connected to the motor, and the thread penetrates the common plate 45. The driving gear 22 and the motor are both arranged on the vertical plate 44. Therefore, when the speed of the device is greater than the preset value, the threaded rod 42 rotates, forcing the common plate 45 to drive the two vertical plates 44 to move, thereby controlling the driving gear 22 to move away from the driven gear 23, and promptly and quickly removing the power of the device. With the cooperation of the clamping column 46 and the clamping slot 43, the vertical plates 44 are stably and movably arranged on both sides of the horizontal plate 41. Since the central angle of the clamping slot 43 is greater than 180°, the upper ends of the two vertical plates 44 are prevented from being away from the horizontal plate 41.

[0033] like Figure 5 As shown, in order to measure the speed of the device in real time, the speed measuring mechanism 5 includes a connecting tube 51 and a vehicle speed sensor 53. The upper end of the vehicle speed sensor 53 can be threadedly inserted into the connecting tube 51, and the lower end is directly opposite to the central axis 15. The upper end of the connecting tube 51 is connected to the cross plate 41, and a through hole 52 is provided on the top. The vehicle speed sensor 53 can be arranged directly opposite to the central axis 15, so that the speed of the device can be obtained in real time. The vehicle speed sensor 53 transmits the measured information to the processor 21 in real time. The through hole 52 is arranged to facilitate the data line to pass through, so that the vehicle speed sensor 53 and the processor 21 are electrically connected.

[0034] like Figure 6 As shown, in order to obtain the distance traveled by the device, the distance measuring mechanism 3 includes a measuring wheel 32, an angle sensor 31 and two support plates 33. The upper ends of the two support plates 33 are connected to the support frame 4 and are distributed on both sides of the measuring wheel 32. The end shaft of the measuring wheel 32 passes through the setting of the support plate 33 and is connected to the angle sensor 31. At the same time, the measuring wheel 32 is in contact with the road surface. When the measuring wheel 32 rotates with the movement of the device, the angle sensor 31 measures the number of rotations of the measuring wheel 32 in real time. The number of rotations is multiplied by the circumference of the measuring wheel 32 and the distance traveled by the device can be obtained. Because the angle sensor 31 is electrically connected to the processor 21, it can transmit the distance information obtained in real time to the processor 21, and the processor 21 can record the travel distance of the device at each moment, so that the staff can extract the distance parameter of the device at a certain moment.

[0035] like Figure 1 , Figure 2As shown, in order to increase or decrease the mass of the device according to demand and provide electric energy for the device to work, a support plate 14 is provided on the vehicle frame 1, and a limiting column 13 is threadedly inserted on the upper side of the support plate 14, and the limiting column 13 is provided through the counterweight block 12, and a battery is embedded on the counterweight block 12. The battery can provide electric energy for the device to work, and at the same time, with the cooperation of the battery and the counterweight block 12, the mass of the device can be increased.

[0036] Example 2

[0037] like Figure 1 , Figure 2 , Figure 3 As shown, a road friction coefficient measuring vehicle for airport engineering includes a vehicle frame 1 and a driving measurement component 2. The vehicle frame 1 is set as a rectangular structure, and a central axis 15 is set at the front and rear of the lower part of the vehicle frame 1, and a running wheel 16 is set at both ends of the central axis 15. A display screen 11 is set on the vehicle frame 1. The driving measurement component 2 includes a motor, a driving gear 22, a driven gear 23, a support frame 4, a distance measurement mechanism 3 and a speed measurement mechanism 5. The driving gear 22 is set on the support frame 4 and connected to the output shaft of the motor, and the support frame 4 can adjust the position of the driving gear 22. The driven gear 23 is sleeved on a certain central axis 15 and can mesh with the driving gear 22. The distance measurement mechanism 3 is set at the end of the support frame 4 and contacts the road surface. The vehicle speed sensor 53 is set below the support frame 4 and faces the central axis 15. In addition, a processor 21 is set above the support frame 4, and the processor 21 is electrically connected to the display screen 11, the motor, the vehicle speed sensor 53 and the distance measurement mechanism 3. When using the device to measure the friction coefficient of the airport pavement, the device is placed on the ground, and the program for the device to run is set by touching the display screen 11. After the program is set, the processor 21 controls the motor to work, thereby forcing the walking wheel 16 to rotate, driving the device to move on the airport pavement. At the same time, the vehicle speed sensor 53 and the distance measuring mechanism 3 respectively measure the speed and travel distance of the device in real time. When the speed of the device reaches the preset value, the driving gear 22 moves out of the connection with the driven gear 23. Thereafter, the device decelerates under the action of friction until it stops. After the device stops moving, the staff touches the display screen 11 to retrieve the distance parameter traveled after the vehicle speed reaches the preset value, and uses The formula is used to obtain the magnitude of the friction force suffered by the device after losing power, and then the friction coefficient u is obtained using the formula F=umg. The above formula is a common physics formula and will not be described in detail here.

[0038] like Figure 4As shown, in order to lose power when the device reaches a preset speed and reduce the influence of the motor on the running of the device, the support frame 4 includes a horizontal plate 41, a threaded rod 42, a common plate 45 and two vertical plates 44. The two vertical plates 44 are arranged at both ends of the common plate 45. The upper ends of the two vertical plates 44 close to the side walls are provided with a clamping column 46, and the upper ends of the two vertical plates 44 are distributed on both sides of the horizontal plate 41. A clamping groove 43 is arranged on the side wall of the horizontal plate 41. The central angle of the clamping groove 43 is greater than 180°. The clamping column 46 is located in the clamping groove 43. The threaded rod 42 is arranged below the horizontal plate 41, and the end is connected to the motor, and the thread penetrates the common plate 45. The driving gear 22 and the motor are both arranged on the vertical plate 44. Therefore, when the speed of the device is greater than the preset value, the threaded rod 42 rotates, forcing the common plate 45 to drive the two vertical plates 44 to move, thereby controlling the driving gear 22 to move away from the driven gear 23, and promptly and quickly removing the power of the device. With the cooperation of the clamping column 46 and the clamping slot 43, the vertical plates 44 are stably and movably arranged on both sides of the horizontal plate 41. Since the central angle of the clamping slot 43 is greater than 180°, the upper ends of the two vertical plates 44 are prevented from being away from the horizontal plate 41.

[0039] like Figure 5 As shown, in order to measure the speed of the device in real time, the speed measuring mechanism 5 includes a connecting tube 51 and a vehicle speed sensor 53. The upper end of the vehicle speed sensor 53 can be threadedly inserted into the connecting tube 51, and the lower end is directly opposite to the central axis 15. The upper end of the connecting tube 51 is connected to the cross plate 41, and a through hole 52 is provided on the top. The vehicle speed sensor 53 can be arranged directly opposite to the central axis 15, so that the speed of the device can be obtained in real time. The vehicle speed sensor 53 transmits the measured information to the processor 21 in real time. The through hole 52 is arranged to facilitate the data line to pass through, so that the vehicle speed sensor 53 and the processor 21 are electrically connected.

[0040] like Figure 6 As shown, in order to obtain the distance traveled by the device, the distance measuring mechanism 3 includes a measuring wheel 32, an angle sensor 31 and two support plates 33. The upper ends of the two support plates 33 are connected to the support frame 4 and are distributed on both sides of the measuring wheel 32. The end shaft of the measuring wheel 32 passes through the setting of the support plate 33 and is connected to the angle sensor 31. At the same time, the measuring wheel 32 is in contact with the road surface. When the measuring wheel 32 rotates with the movement of the device, the angle sensor 31 measures the number of rotations of the measuring wheel 32 in real time. The number of rotations is multiplied by the circumference of the measuring wheel 32 and the distance traveled by the device can be obtained. Because the angle sensor 31 is electrically connected to the processor 21, it can transmit the distance information obtained in real time to the processor 21, and the processor 21 can record the travel distance of the device at each moment, so that the staff can extract the distance parameter of the device at a certain moment.

[0041] like Figure 1 , Figure 2As shown, in order to increase or decrease the mass of the device according to demand and provide electric energy for the device to work, a support plate 14 is provided on the vehicle frame 1, and a limiting column 13 is threadedly inserted on the upper side of the support plate 14, and the limiting column 13 is provided through the counterweight block 12, and a battery is embedded on the counterweight block 12. The battery can provide electric energy for the device to work, and at the same time, with the cooperation of the battery and the counterweight block 12, the mass of the device can be increased.

[0042] like Figure 7 , Figure 8 As shown, in order to better fit the actual situation of braking during landing of a civil aircraft, a brake mechanism 6 is provided on the vehicle frame 1. The brake mechanism 6 includes a fixed plate 64, a brake plate 61 and an electric cylinder 63. The brake plate 61 is arranged below the fixed plate 64. The electric cylinder 63 is fixedly arranged on the lower side of the fixed plate 64, and the telescopic end is connected to the brake plate 61. A limiting rod 62 is also arranged above the brake plate 61. The upper end of the limiting rod 62 penetrates the fixed plate 64. The brake mechanism 6 is provided with two groups, which are respectively arranged at the front and rear ends of the vehicle frame 1. The brake plate 61 can be sleeved on the central axis 15. When the speed of the device reaches the preset value, the processor 21 controls the electric cylinder 63 to work, forcing the brake plate 61 to drop and fit the central axis 15, forcing the running wheel 16 to stop rotating. Under the action of friction, the speed of the device is gradually reduced until it stops. A more accurate friction coefficient is obtained by obtaining the corresponding physical parameters.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A road friction coefficient measuring vehicle for airport engineering, characterized in that: The invention comprises a vehicle frame (1), wherein a central axis (15) is arranged at the front and rear of the lower part of the vehicle frame (1), and running wheels (16) are arranged at both ends of the central axis (15); a driving measurement component (2) and a braking mechanism (6) are also arranged on the vehicle frame (1), wherein the driving measurement component (2) can control the running wheel (16) to rotate, and the braking mechanism (6) is arranged above the central axis (15) and can control the running wheel (16) to stop rotating.

2. The road friction coefficient measuring vehicle for airport engineering according to claim 1, characterized in that: The braking mechanism (6) comprises a fixed plate (64), a braking plate (61) and an electric cylinder (63); the braking plate (61) is arranged below the fixed plate (64); the electric cylinder (63) is fixedly arranged on the lower side of the fixed plate (64), and the telescopic end is connected to the braking plate (61); a limiting rod (62) is also arranged above the braking plate (61), and the upper end of the limiting rod (62) passes through the fixed plate (64).

3. The road friction coefficient measuring vehicle for airport engineering according to claim 2, characterized in that: The brake mechanism (6) is provided with two groups, which are respectively arranged at the front and rear ends of the vehicle frame (1), and the brake plate (61) can be sleeved on the central axis (15).

4. The road friction coefficient measuring vehicle for airport engineering according to claim 1, characterized in that: The driving measurement assembly (2) comprises a motor, a driving gear (22) and a driven gear (23), wherein the driving gear (22) is arranged on an output shaft of the motor, and the driven gear (23) is sleeved on a central shaft (15) and can be meshed and connected with the driving gear (22).

5. The road friction coefficient measuring vehicle for airport engineering according to claim 4, characterized in that: The driving gear (22) is arranged on a support frame (4), and the support frame (4) comprises a transverse plate (41), a threaded rod (42), a common plate (45) and two vertical plates (44), wherein the two vertical plates (44) are arranged at both ends of the common plate (45), and the upper ends of the two vertical plates (44) are distributed on both sides of the transverse plate (41), and the threaded rod (42) is arranged below the transverse plate (41), and the end thereof is connected to the motor, and the thread penetrates the common plate (45).

6. The road friction coefficient measuring vehicle for airport engineering according to claim 5, characterized in that: A clamping groove (43) is provided on the side wall of the horizontal plate (41), and a clamping column (46) is provided at the upper ends of the two vertical plates (44) close to the side wall, and the clamping column (46) is located in the clamping groove (43).

7. The road friction coefficient measuring vehicle for airport engineering according to claim 6, characterized in that: A distance measuring mechanism (3) is arranged at the end of the support frame (4), and the distance measuring mechanism (3) comprises a measuring wheel (32), an angle sensor (31) and two supporting plates (33), the upper ends of the two supporting plates (33) are connected to the support frame (4) and are distributed on both sides of the measuring wheel (32), and the end shaft of the measuring wheel (32) passes through the support plate (33) and is connected to the angle sensor (31).

8. The road friction coefficient measuring vehicle for airport engineering according to claim 7, characterized in that: A speed measuring mechanism (5) is also provided below the support frame (4), and the speed measuring mechanism (5) comprises a connecting pipe (51) and a vehicle speed sensor (53). The upper end of the vehicle speed sensor (53) can be threadedly inserted into the connecting pipe (51), the upper end of the connecting pipe (51) is connected to the cross plate (41), and a through hole (52) is provided at the top.

9. The road friction coefficient measuring vehicle for airport engineering according to claim 8, characterized in that: A processor (21) is arranged above the transverse plate (41), a display screen (11) is arranged on the vehicle frame (1), and the processor (21) is electrically connected to the display screen (11), the motor, the vehicle speed sensor (53) and the angle sensor (31).

10. The road friction coefficient measuring vehicle for airport engineering according to claim 1, characterized in that: A support plate (14) is arranged on the vehicle frame (1), a limiting column (13) is threadedly inserted on the upper side of the support plate (14), the limiting column (13) passes through a counterweight block (12), and a battery is embedded in the counterweight block (12).

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