Aircraft tow vehicle clamp-on telescopic boom displacement monitoring device

Abstract

The utility model discloses a kind of no mop airplane tractor clamping telescopic arm displacement monitoring devices, including telescopic arm, telescopic arm sleeve and actuating mechanism, the telescopic arm is driven from telescopic arm sleeve by actuating mechanism and extends or retracts, further include angle sensor, swing arm, pin shaft and rotating shaft, one end of the swing arm is connected with rotating shaft, the other end is connected with pin shaft, the rotating shaft is installed on telescopic arm sleeve or with angle sensor cooperation, the telescopic arm is equipped with the oblique slide groove of the moving direction inclination arrangement relative telescopic arm, the pin shaft and oblique slide groove sliding fit, the angle sensor measures swing arm swing angle, the utility model has simple structure, low in cost, precision and reliability are high, realize full stroke continuous monitoring, easy maintenance and the like advantages.

Description

Technical Field

[0001] This utility model relates to the field of aircraft towing vehicle technology, specifically a displacement monitoring device for the telescopic arm of a towing vehicle without a tow bar. Background Technology

[0002] The towless aircraft towing vehicle is a commonly used aircraft towing equipment. It uses a clamping and lifting method to push and tow the aircraft nose wheel. The telescopic arm used by the aircraft towing vehicle is one of the main working mechanisms. For example, CN102951296B discloses a clamping device for the aircraft nose wheel. In the specification, paragraph

[0023] , line 10, "The two sides of the support platform 3 are respectively provided with telescopic cylinders 4 and telescopic sleeves 5. The telescopic sleeve 5 is provided with a telescopic arm 6. The rear end of the telescopic arm 6 is provided with a locking frame 18. The locking frame 18 is hinged to the telescopic cylinder 4 to facilitate the telescopic arm 6 to make linear movement in the telescopic sleeve 5 by the extension and retraction of the telescopic cylinder 4."

[0003] Currently, the main technical means for monitoring the displacement of telescopic booms include using wire-type angle sensors, proximity switches, or magnetostrictive sensors built into hydraulic cylinders. Wire-type angle sensors measure displacement by converting the extension and retraction of a steel wire rope into a rotation angle. One end of the steel wire rope is fixed to the telescopic boom, and the other end is wound around the reel of the angle sensor. When the telescopic boom extends, it pulls the reel to rotate; when the telescopic boom retracts, the steel wire rope is retrieved by a built-in spring on the reel. The problems with this structure are: the steel wire rope is easily affected by ice, snow, and sand, leading to a decrease in measurement accuracy and reliability; and because the steel wire rope is wound around the reel, repeated operation can easily cause fatigue and breakage.

[0004] Proximity switches are relatively inexpensive, but they can only monitor certain points and cannot achieve continuous monitoring throughout the entire travel distance, resulting in poor accuracy.

[0005] The built-in magnetostrictive sensor in the hydraulic cylinder has high accuracy and can continuously monitor the entire stroke, but it has problems such as high cost, difficult maintenance, and poor economic efficiency. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a displacement monitoring device for the telescopic arm of an aircraft tractor without a tow bar, which is simple in structure, low in cost, highly accurate and reliable, enables continuous monitoring throughout the entire stroke, and is easy to maintain.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A displacement monitoring device for a telescopic boom clamp of a towless aircraft tractor includes a telescopic boom, a telescopic boom sleeve, and an actuator. The telescopic boom extends or retracts from the telescopic boom sleeve via the actuator. The device is characterized by further including an angle sensor, a swing arm, a pin, and a rotating shaft. One end of the swing arm is connected to the rotating shaft, and the other end is connected to the pin. The rotating shaft is mounted on the telescopic boom sleeve or cooperates with the angle sensor. The telescopic boom has an inclined groove that is tilted relative to the direction of movement of the telescopic boom. The pin slides into the inclined groove. The angle sensor measures the swing angle of the swing arm. The linear motion of the telescopic boom is converted into the swing of the swing arm through the inclined groove. The angle sensor monitors the swing angle of the swing arm, and the linear displacement of the telescopic boom can be calculated. The device has a simple structure, low cost, can achieve continuous monitoring throughout the entire stroke, has high measurement accuracy and reliability, and is easy to maintain.

[0009] The telescopic arm of this invention is fixed with a guide rail, and the inclined groove is formed on the guide rail. The guide rail is fixed on the telescopic arm and is processed independently, which avoids directly slotting on the telescopic arm body, reduces the weakening of the telescopic arm's structural strength, and can also effectively prevent damage to the telescopic arm from long-term use, thus extending the life of the telescopic arm.

[0010] The inclined slide groove of this invention extends obliquely in the direction of the retraction movement of the telescopic arm, thus matching the movement direction of the telescopic arm.

[0011] The length of the inclined slide groove described in this invention is greater than the maximum stroke of the telescopic arm to accommodate full-stroke monitoring.

[0012] The swing arm and the pin shaft of this invention rotate together, so that when the telescopic arm extends or retracts to make linear movements, the pin shaft can slide smoothly in the inclined slide groove and drive the swing arm to swing.

[0013] The swing arm of this invention is fixedly connected to the rotating shaft, which is an angle sensor rotating shaft or the rotating shaft is connected to an angle sensor rotating shaft; the swing arm swings to drive the rotating shaft to rotate, and the angle sensor measures the rotation angle of the rotating shaft to realize the swing angle measurement of the swing arm.

[0014] The angle sensor described in this utility model is a Hall sensor;

[0015] The swing arm is fixedly connected to the rotating shaft, the rotating shaft is rotatably connected to the telescopic arm sleeve, and a magnet is installed on the swing arm or the rotating shaft; or the swing arm is rotatably connected to the rotating shaft, the rotating shaft is fixedly connected to the telescopic arm sleeve, and a magnet is installed on the swing arm; the swing angle of the swing arm is measured by magnetic induction.

[0016] The angle sensor described in this invention is fixed to the telescopic arm sleeve via a sensor mount, thus fixing the position of the angle sensor and facilitating installation, disassembly, and maintenance.

[0017] The sensor base of this utility model includes a base plate and a supporting side plate. The base plate is fixed on the sensor sleeve, and the bottom of the supporting side plate is fixedly connected to the base plate. The angle sensor is installed in the sensor base. A swing arm is provided in the space between the angle sensor and the base plate in the sensor base. A pin through hole for the pin shaft to pass through is opened on the base plate and the telescopic arm sleeve respectively. One end of the pin shaft is connected to the swing arm, and the other end passes through the pin through hole on the base plate and the telescopic arm sleeve and slides in cooperation with the inclined groove.

[0018] The swing arm is integrated inside the sensor base, which is compact and has a high space utilization rate, significantly reducing the overall volume. When the swing arm swings, it will not collide or interfere with the telescopic arm or telescopic arm sleeve, ensuring monitoring accuracy. At the same time, it can protect the swing arm and pin from damage caused by dust, rain, mechanical impact, etc., ensuring monitoring accuracy and reliability in harsh environments.

[0019] The angle between the length direction of the inclined slide groove and the moving direction of the telescopic arm is θ. When the telescopic arm is fully retracted, the angle between the center line of the swing arm and the displacement direction of the telescopic arm is α1. When the telescopic arm is extended, the angle between the center line of the swing arm and the displacement direction of the telescopic arm is α2. The distance from the center of the angle sensor shaft to the center of the pin shaft is R. The displacement of the telescopic arm from when it is extended to when it is fully retracted is ΔL.

[0020] ΔL= R(sinα2- sinα1) / tanθ;

[0021] R and θ are known constants. Based on the swing angle of the arm measured by the angle sensor, the extension displacement of the telescopic arm can be accurately calculated. The calculation is simple and convenient, with high accuracy, and enables continuous monitoring throughout the entire stroke.

[0022] The beneficial effects of this utility model are as follows: the linear motion of the telescopic arm is converted into the swing of the swing arm through the inclined slide groove, the angle sensor monitors the swing angle of the swing arm, and the linear displacement of the telescopic arm can be calculated. The structure is simple, the cost is low, it can realize continuous monitoring of the entire stroke, and the measurement accuracy and reliability are high and it is easy to maintain. Attached Figure Description

[0023] Figure 1 This is a front view of the telescopic arm of this utility model in the retracted state.

[0024] Figure 2 This is a front view of the telescopic arm of this utility model in the extended state.

[0025] Figure 3 This is a top sectional view of the telescopic arm of this utility model in its retracted state.

[0026] Figure 4 yes Figure 3 Enlarged view of the mid-angle sensor in conjunction with the swing arm.

[0027] Figure 5 This is a schematic diagram of the displacement monitoring conversion of the telescopic arm of this utility model.

[0028] Reference numeral: Telescopic arm-1;

[0029] Telescopic boom sleeve-2;

[0030] Guide rail-3, slanted slide groove-301;

[0031] Angle sensor-4, shaft-401;

[0032] Sensor mount-5, base plate-501, support side plate-502;

[0033] Swing arm -6;

[0034] Pin-7;

[0035] Hydraulic cylinder-8. Detailed Implementation

[0036] The present invention will now be described in conjunction with the accompanying drawings and embodiments.

[0037] As shown in the attached figure, a displacement monitoring device for a telescopic arm of a towless aircraft tractor includes a telescopic arm 1, a telescopic arm sleeve 2, an actuator, an angle sensor 4, a swing arm 6, a pin 7, and a rotating shaft 401. The telescopic arm 1 is inserted into the telescopic arm sleeve 2 and is driven by the actuator to extend or retract from the telescopic arm sleeve 2. The actuator is connected to a controller. In this embodiment, the actuator is a hydraulic cylinder 8, which is connected to the controller. One end of the hydraulic cylinder 8 is connected to the telescopic arm sleeve 2, and the other end is connected to the telescopic arm 1. The hydraulic cylinder 8 drives the telescopic arm 1 to extend or retract from the telescopic arm sleeve 2.

[0038] In this embodiment, one end of the hydraulic cylinder 8 is hinged to the telescopic arm sleeve 2, and the other end is hinged to the telescopic arm 1.

[0039] The actuator can also be configured as a cylinder or an electric push rod, etc., as needed;

[0040] The angle sensor 4 is fixed to the telescopic arm sleeve 2 and connected to the controller. One end of the swing arm 6 is connected to the rotating shaft 401, and the other end is connected to the pin 7. The telescopic arm 1 is provided with an inclined slide groove 301, and the pin 7 is slidably engaged with the inclined slide groove 301. The linear motion of the telescopic arm 1 is converted into the swing of the swing arm 6 through the inclined slide groove 301. The angle sensor 4 monitors the swing angle of the swing arm 6 and can calculate the linear displacement of the telescopic arm 1. The structure is simple, the cost is low, it can realize continuous monitoring of the entire stroke, and the measurement accuracy and reliability are high and it is easy to maintain.

[0041] The swing arm 6 and the pin 7 are rotatably engaged, so that when the telescopic arm 1 extends or retracts to make linear movements, the pin 7 can smoothly slide in the inclined slide groove 301 and drive the swing arm 6 to rotate.

[0042] In this embodiment, the swing arm 6 is fixedly connected to the rotating shaft 401. The rotating shaft 401 is an angle sensor shaft or a combination of the rotating shaft 401 and the angle sensor shaft. When the rotating shaft 401 is connected to the angle sensor shaft, it can be connected by a coupling. When the pin 7 slides in the inclined slide groove 301 and drives the swing arm 6 to swing, the swing arm 6 drives the rotating shaft 401 to rotate. The angle sensor 4 measures the rotation angle of the rotating shaft 401 to realize the swing angle measurement of the swing arm 6. The angle sensor 4 can be a potentiometer-type (resistance wire) angle sensor, a rotary transformer, an encoder, etc.

[0043] Alternatively, a Hall angle sensor can be used as needed. The swing arm 6 can be fixedly connected to the rotating shaft 401, and the rotating shaft 401 can be rotatably connected to the telescopic arm sleeve 2. A magnet can be installed on the swing arm 6 or the rotating shaft 401. Alternatively, the swing arm 6 can be rotatably connected to the rotating shaft 401, and the rotating shaft 401 can be fixedly connected to the telescopic arm sleeve 2. A magnet can be installed on the swing arm 6. The swing arm 6 swings to drive the magnet to rotate, and the Hall element detects the change in magnetic field and outputs the angle.

[0044] In this embodiment, a guide rail 3 is fixed on the side wall of the telescopic arm 1, and the inclined groove 301 is formed on the guide rail 3. The guide rail 3 is fixed on the telescopic arm 1 and is processed independently, avoiding the direct slotting on the telescopic arm body, reducing the weakening of the telescopic arm structure strength, effectively preventing damage to the telescopic arm from long-term use, and extending the life of the telescopic arm.

[0045] In this embodiment, the guide rail 3 can be fixed to the side wall of the telescopic arm 1 by bolts or welding. The guide rail 3 is fixed by bolts to meet the requirements of detachable maintenance, and fixed by welding, which is suitable for high rigidity, lightweight or long-term maintenance-free working conditions.

[0046] The installation position of the guide rail 3 is not limited to the side wall of the telescopic arm 1. It can also be installed on other surfaces of the telescopic arm as needed. The corresponding angle sensor position, swing arm position, etc. can be matched with the guide rail position.

[0047] The inclined slide 301 is elongated and inclined relative to the moving direction of the telescopic arm 1. The angle between the length direction of the inclined slide 301 and the moving direction of the telescopic arm 1 is θ. By setting a fixed angle θ, when the telescopic arm 1 moves, the pin 7 at the end of the swing arm 6 can slide smoothly in the inclined slide 301 and drive the swing arm 6 to rotate, thereby realizing the conversion of linear motion into rotational motion.

[0048] In this embodiment, the inclined slide 301 extends upward or downward in the direction of the retraction movement of the telescopic arm 1, matching the movement direction of the telescopic arm 1.

[0049] In this embodiment, the inclined slide 301 is set to extend upward in the direction of the retraction movement of the telescopic arm 1, or it can be set to extend downward in the direction of the retraction movement of the telescopic arm 1 as needed.

[0050] When the guide rail 3 is set on the upper or lower end face of the telescopic arm, the length direction of the inclined slide groove 301 extends forward or backward in the direction of the telescopic arm 1 retracting.

[0051] The length of the inclined slide 301 is greater than the maximum stroke of the telescopic arm 1 to accommodate full-stroke monitoring.

[0052] The angle sensor 4 is fixed to the telescopic arm sleeve via the sensor base 5, thus fixing the position of the angle sensor 4 and facilitating installation, disassembly, and maintenance.

[0053] The sensor base 5 includes a base plate 501 and a supporting side plate 502. The base plate 501 is fixed on the sensor sleeve 2. The bottom of the supporting side plate 502 is fixedly connected to the base plate 501. The angle sensor 4 is installed in the sensor base 5. The sensor base 5 has a swing arm 6 in the space between the angle sensor 4 and the base plate 501. The base plate 501 and the telescopic arm sleeve 2 are respectively provided with pin holes for the pin shaft 7 to pass through. One end of the pin shaft 7 is rotatably connected to the swing arm 6, and the other end passes through the pin holes on the base plate 501 and the telescopic arm sleeve 2 and slides with the inclined slide groove 301.

[0054] The swing arm 6 is integrated inside the sensor base 5, which has a compact structure, high space utilization, and significantly reduces the overall volume. When the swing arm 6 swings, it will not collide or interfere with the telescopic arm 1, telescopic arm sleeve 2, etc., ensuring monitoring accuracy. At the same time, it can protect the swing arm 6 and the pin shaft 7 from damage by dust, rain, mechanical collisions, etc., ensuring monitoring accuracy and reliability in harsh environments.

[0055] When the angle sensor is a Hall angle sensor, the rotating shaft can be connected to the base plate 501 of the sensor base 5.

[0056] In this embodiment, the sensor base 5 is fixed to the telescopic arm sleeve 2 by bolts, and the angle sensor 4 is fixed to the sensor base 5 by bolts, making installation, disassembly and maintenance convenient.

[0057] In this embodiment, the controller can be a PLC controller.

[0058] like Figure 1 , Figure 4 As shown, when the telescopic arm 1 is fully retracted, the angle between the center line of the swing arm 6 and the displacement direction of the telescopic arm 1 is α1.

[0059] like Figure 2 , Figure 4 As shown, when the telescopic arm 1 extends a certain distance, the angle between the center line of the swing arm 6 and the displacement direction of the telescopic arm 1 is α2.

[0060] like Figure 4 As shown, when the telescopic arm 1 extends a certain distance, the height of the center of the pin shaft from the center of the angle sensor shaft 401 is H;

[0061] When the telescopic arm 1 is fully retracted, the height of the center of the pin shaft from the center of the angle sensor shaft 401 is H0.

[0062] The distance from the center of the angle sensor shaft 401 to the center of the pin is R;

[0063] The angle between the length direction of the inclined slide 301 and the moving direction of the telescopic arm 1 is θ;

[0064] The displacement of the telescopic arm 1 when it extends a certain distance relative to when it is completely retracted is ΔL;

[0065] The conversion process is as follows:

[0066] H0 = Rsinα1;

[0067] H = Rsinα2;

[0068] tanθ = (H - H0) / ΔL;

[0069] Then it is calculated that,

[0070] ΔL=R(sinα2- sinα1) / tanθ;

[0071] R and θ are known constants of the design, and α1 and α2 are measured by the angle sensor. Based on this, the extension displacement ΔL of the telescopic boom can be accurately calculated. The calculation formula is simple and convenient, with high accuracy, and enables continuous monitoring throughout the entire stroke.

[0072] When this utility model is in operation;

[0073] 1. When the telescopic arm 1 is fully retracted, the angle sensor 4 measures the value of the angle α1 between the center line of the swing arm 6 and the displacement direction of the telescopic arm 1;

[0074] 2. When the telescopic arm 1 extends, the angle sensor 4 measures the value of the angle α2 between the center line of the swing arm 6 and the displacement direction of the telescopic arm 1 in real time;

[0075] 3. The extension amount of telescopic arm 1 is calculated according to the formula ΔL=R(sinα2- sinα1) / tanθ, and the controller can monitor the displacement of telescopic arm 1 in real time.

Claims

1. A displacement monitoring device for a telescopic boom clamp of a towless aircraft tractor, comprising a telescopic boom, a telescopic boom sleeve, and an actuator, wherein the telescopic boom is driven by the actuator to extend or retract from the telescopic boom sleeve, characterized in that: It also includes an angle sensor, a swing arm, a pin, and a rotating shaft. One end of the swing arm is connected to the rotating shaft, and the other end is connected to the pin. The rotating shaft is mounted on the telescopic arm sleeve or cooperates with the angle sensor. The telescopic arm is provided with an inclined sliding groove that is inclined relative to the moving direction of the telescopic arm. The pin slides in cooperation with the inclined sliding groove. The angle sensor measures the swing angle of the swing arm.

2. The displacement monitoring device for the telescopic boom of a towless aircraft tractor according to claim 1, characterized in that: The telescopic arm is fixed with a guide rail, and the inclined slide groove is formed on the guide rail.

3. The displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1 or 2, characterized in that: The inclined slide extends obliquely in the direction of the telescopic arm's retraction movement.

4. The displacement monitoring device for the telescopic boom clamp of a tow truck without a mop as described in claim 3, characterized in that: The length of the inclined slide is greater than the maximum stroke of the telescopic arm.

5. A displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1, 2, or 4, characterized in that: The swing arm rotates in conjunction with the pin.

6. A displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1, 2, or 4, characterized in that: The swing arm is fixedly connected to the rotating shaft, which is either the angle sensor rotating shaft or the rotating shaft is connected to the angle sensor rotating shaft.

7. A displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1, 2, or 4, characterized in that: The angle sensor is a Hall sensor; The swing arm is fixedly connected to the rotating shaft, the rotating shaft is rotatably connected to the telescopic arm sleeve, and a magnet is installed on the swing arm or the rotating shaft; or the swing arm is rotatably connected to the rotating shaft, the rotating shaft is fixedly connected to the telescopic arm sleeve, and a magnet is installed on the swing arm.

8. A displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1, 2, or 4, characterized in that: The angle sensor is fixed to the telescopic arm sleeve via a sensor mount.

9. The displacement monitoring device for the telescopic boom clamp of a tow truck without a mop as described in claim 8, characterized in that: The sensor base includes a base plate and a supporting side plate. The base plate is fixed on the sensor sleeve, and the bottom of the supporting side plate is fixedly connected to the base plate. The angle sensor is installed inside the sensor base. A swing arm is provided in the space between the angle sensor and the base plate inside the sensor base. Pin holes for pin shafts to pass through are respectively opened on the base plate and the telescopic arm sleeve. One end of the pin shaft is connected to the swing arm, and the other end passes through the pin holes on the base plate and the telescopic arm sleeve and slides with the inclined groove.

10. A displacement monitoring device for the telescopic boom clamp of a towless aircraft tractor according to claim 1, 2, 4, or 9, characterized in that: The angle between the length direction of the inclined slide and the moving direction of the telescopic arm is θ. When the telescopic arm is fully retracted, the angle between the center line of the swing arm and the displacement direction of the telescopic arm is α1. When the telescopic arm is extended, the angle between the center line of the swing arm and the displacement direction of the telescopic arm is α2. The distance from the center of the angle sensor shaft to the center of the pin shaft is R. The displacement of the telescopic arm when it is extended relative to when it is fully retracted is ΔL. ΔL= R(sinα2- sinα1) / tanθ.

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