An adjustment mechanism for a towing hook on an aircraft tractor

Abstract

The present invention provides an adjustment mechanism for a towing hook on an aircraft tractor, belonging to the technical field of aircraft towing equipment. It solves the technical problems such as the trouble in connecting the towing rod to the tractor. The adjustment mechanism for the towing hook on this aircraft tractor includes a mounting seat fixedly connected to the frame of the aircraft tractor. On the side surface of the mounting seat, there are a ratchet rack one and a ratchet rack two arranged side by side. On one side of the seat body of the towing hook, there is a mounting strip one extending upward towards the ratchet rack one and a mounting strip two extending downward towards the ratchet rack one. On the mounting strip one, there are respectively a pawl one engaged with the ratchet rack one and a pawl two engaged with the ratchet rack two; on the mounting strip two, there is a push rod capable of pushing the pawl one away from the ratchet rack one and the pawl two away from the ratchet rack two; between the seat body of the towing hook and the mounting seat, there is a translational hydraulic cylinder. The present invention very conveniently realizes the docking of the aircraft tractor and the towing rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of aircraft towing equipment, and relates to an adjusting mechanism for a towing hook on an aircraft tractor. Background Art

[0002] An aircraft tractor is a support equipment for towing aircraft on the airport ground, and can also be used to move large aircraft components or aircraft during the aircraft manufacturing process. The aircraft tractor and the aircraft are usually detachably connected by a towing bar. The towing bar is generally independently arranged. When the towing bar is needed, the towing hook on the aircraft tractor is connected to the connecting ring at one end of the towing bar, and the other end of the towing bar is docked with the aircraft, and then the aircraft is towed; a set of docking actions of the towing bar are observed by a dedicated person to direct the docking, which is very troublesome, and the labor intensity of the docking personnel is high. Both the operation and the command need to work at the rear of the vehicle, which poses a certain safety risk.

[0003] The towing hook on the existing aircraft tractor is fixed on the aircraft tractor and cannot be adjusted forward and backward. On the premise that the towing bar and the aircraft are connected, if there is a certain distance between the towing bar and the towing hook, the connection between the towing bar and the towing hook on the tractor cannot be achieved. At this time, the tractor needs to be restarted, advanced and retreated to adjust the position of the tractor. After aligning the towing bar and the towing hook of the tractor, the towing pin can be assembled to tow the aircraft. Such a docking method is very troublesome and requires multiple adjustments of the tractor position. At the same time, a person is also needed to observe and direct at the rear of the vehicle, which affects work efficiency and increases labor costs. There is also a certain safety risk for the commander at the rear of the vehicle. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides an adjusting mechanism for a towing hook on an aircraft tractor. The technical problem to be solved by the present invention is: how to improve the convenience and safety of the connection between the aircraft tractor and the towing bar.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An adjustment mechanism for a towing hook on an aircraft tractor, comprising a mounting seat fixedly connected to the frame of the aircraft tractor, characterized in that on the side surface of the mounting seat, there are a ratchet rack one and a ratchet rack two arranged side by side, the directions of the ratchet teeth on the ratchet rack one and the ratchet rack two are opposite, on one side of the seat body of the towing hook, there is a mounting bar one extending upward towards the ratchet rack one and the ratchet rack two, and on the mounting bar one, there are respectively a pawl one engaged with the ratchet rack one and a pawl two engaged with the ratchet rack two; on one side of the seat body of the towing hook, there is also a mounting bar two extending downward towards the ratchet rack one and the ratchet rack two, and on the mounting bar two, there is a push rod capable of pushing the pawl one away from the ratchet rack one and the pawl two away from the ratchet rack two; a translational hydraulic cylinder is arranged between the seat body of the towing hook and the mounting seat.

[0007] In the above adjustment mechanism for the towing hook on the aircraft tractor, a connecting pin shaft is arranged on the mounting bar one, one ends of the pawl one and the pawl two are sleeved side by side on the connecting pin shaft, and the other ends of the pawl one and the pawl two both have abutting parts that are arc-shaped and inclined downward, and the arc bending directions of the abutting part of the pawl one and the abutting part of the pawl two are opposite; a return torsion spring is arranged on the connecting pin shaft, and the return torsion spring has a tendency to make the abutting part of the pawl one abut on the ratchet teeth of the ratchet rack one and the abutting part of the pawl two abut on the ratchet teeth of the ratchet rack two.

[0008] In the above adjustment mechanism for the towing hook on the aircraft tractor, a limiting bracket is fixedly arranged at the outer ends of the ratchet rack one and the ratchet rack two through connecting bolts, and the upper side surface of the limiting bracket is flush with the top surfaces of the ratchet teeth of the ratchet rack one and the ratchet rack two. The upper side surface of the limiting bracket can also be slightly higher than the top surfaces of the ratchet teeth of the ratchet rack one and the ratchet rack two, so that the ratchet teeth of the ratchet rack one and the ratchet rack two form a closed loop. If the ratchet rack one and the ratchet rack two do not play a limiting role, it can still ensure that the towing hook and the ratchet rack one and the ratchet rack two restrain each other and do not disengage.

[0009] In the above adjustment mechanism for the towing hook on the aircraft tractor, a locking hook platform and a vertically downward driving oil cylinder are arranged on the other side of the seat body of the towing hook, the driving oil cylinder is fixedly connected to the seat body of the towing hook through a mounting bracket, the locking hook platform is located directly below the driving oil cylinder and the two are arranged at an interval, and a vertical towing pin is fixedly connected to the output shaft of the driving oil cylinder.

[0010] In the adjusting mechanism of the towing hook on the above-mentioned aircraft tractor, the driving oil cylinder is a unidirectional oil cylinder. A return spring for making the towing pin return upward is provided on the mounting bracket. The locking hook platform has a through hole and the lower end of the towing pin can be inserted into the through hole. A pressing part extending to directly below the through hole is provided on the push rod. The towing pin and the piston of the unidirectional oil cylinder are in contact under the pressure of the return spring but are not connected. In this technical solution, the towing pin can be automatically lifted and lowered, solving the physical labor of having a dedicated person to remove and install the towing pin.

[0011] In the adjusting mechanism of the towing hook on the above-mentioned aircraft tractor, guide blocks are fixedly provided on both sides of the second mounting strip. Two upward push arms are provided on the push rod. The two push arms respectively pass through the corresponding guide blocks and their tops can respectively abut against the first pawl and the second pawl. A return spring capable of providing an upward force for the push arm is further provided between the push arm and the guide block.

[0012] In the adjusting mechanism of the towing hook on the above-mentioned aircraft tractor, the first ratchet rack and the second ratchet rack are integrally formed with the mounting seat. The first ratchet rack and the second ratchet rack are arranged in parallel at a left-right interval. The width of the first pawl is greater than the width of the first ratchet rack. A part of the abutting portion of the first pawl abuts against the first ratchet rack, and another part of the abutting portion of the first pawl protrudes outside the first ratchet rack and abuts against one push arm of the push rod. The width of the second pawl is greater than the width of the second ratchet rack. A part of the abutting portion of the second pawl abuts against the second ratchet rack, and another part of the abutting portion of the second pawl protrudes outside the second ratchet rack and abuts against the other push arm of the push rod.

[0013] In the adjusting mechanism of the towing hook on the above-mentioned aircraft tractor, the first mounting strip and the second mounting strip are integrally formed with the seat body of the towing hook. The first mounting strip and the second mounting strip are arranged in parallel at an up-down interval.

[0014] In the adjusting mechanism of the towing hook on the above-mentioned aircraft tractor, a first mounting frame is provided on the side surface of the seat body of the towing hook. The end of the housing of the translational hydraulic cylinder is hinged to the first mounting frame through a first pin shaft. A second mounting frame is provided on the side surface of the mounting seat. The end of the output shaft of the translational hydraulic cylinder is hinged to the second mounting frame through a second pin shaft.

[0015] Before the aircraft towing bar and the towing hook need to be accurately aligned, the towing pin is pulled up under the action of the towing pin return spring, the push rod is pushed up under the action of the return spring, the first pawl is separated from the first ratchet rack, and the second pawl is separated from the second ratchet rack; when accurate alignment is required, the translational hydraulic cylinder is started, and the seat body of the towing hook moves forward and backward relative to the mounting seat under the action of the translational hydraulic cylinder. After the connecting ring of the towing bar and the through hole on the locking hook platform are aligned, the translational hydraulic cylinder stops working, and the driving cylinder is started. Under the action of hydraulic pressure, the piston of the driving cylinder pushes the towing pin to move downward against the elastic force of the return spring. When the towing pin moves to the lower plane of the locking hook platform, it pushes the push rod to move downward against the action of the return spring until the towing pin moves to the limit position. At the limit position, the towing pin pushes the push rod away from the first pawl and the second pawl. The first pawl and the second pawl are pressed against and hold the first ratchet rack and the second ratchet rack under the action of the return torsion spring. When the aircraft tractor pulls the aircraft forward, the first pawl holds the ratchet teeth of the first ratchet rack to limit the relative movement between the mounting seat and the towing hook. When the aircraft tractor pushes the aircraft forward, the second pawl holds the ratchet teeth of the second ratchet rack to limit the relative movement between the mounting seat and the towing hook; when the aircraft tractor pulls the aircraft to the designated position and the towing bar and the towing hook need to be disengaged, at this time, the driving cylinder unloads, and the towing pin moves upward under the action of the return spring. When it moves to the limit position, the aircraft towing bar is removed to achieve the disengagement of the aircraft towing bar and the towing hook. At this time, the push rod pushes the first pawl and the second pawl away from the first ratchet rack and the second ratchet rack under the action of the return spring.

[0016] In this technical solution, the upper end of the towing pin has a 20-mm sliding insertion into the mounting bracket to guide the up-and-down movement of the towing pin. In this technical solution, the towing hook can be adjusted 150 mm forward and backward, enabling adjustment through this adjustment mechanism when the alignment of the tractor is inaccurate; there is no need to restart the vehicle to move the vehicle position multiple times, saving time. The staff does not need to work at the rear of the vehicle for a long time, improving the safety of the staff when towing the aircraft.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. In the present invention, the towing hook can be adjusted 150 mm forward and backward, enabling adjustment through this adjustment mechanism when the alignment of the tractor is inaccurate; there is no need to restart the vehicle to move the vehicle position multiple times, saving time. The staff does not need to work at the rear of the vehicle for a long time, improving the safety of the staff when towing the aircraft.

[0019] 2. After the towing hook in the present invention is adjusted to a suitable position, the first pawl, the second pawl, the first ratchet rack and the second ratchet rack cooperate to achieve two-way limiting. Each movement direction has a pawl to limit the movement, ensuring its stability and reliability.

[0020] 3. In the present invention, the towing pin can be automatically lifted and lowered through the driving oil cylinder and the return spring, solving the physical labor of requiring a dedicated person to remove and install the towing pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of this adjustment mechanism.

[0022] Figure 2 It is a sectional structural schematic diagram of this adjustment mechanism.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the mounting base in this adjustment mechanism.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the guide block in this adjustment mechanism.

[0025] Figure 5 It is a partial structural schematic diagram of the towing hook in this adjustment mechanism.

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the push rod in this adjustment mechanism.

[0027] Figure 7 It is a partial structural schematic diagram of this adjustment mechanism.

[0028] In the figure, 1. Mounting base; 2. First ratchet and rack; 3. Second ratchet and rack; 4. Towing hook; 41. Seat body; 42. First mounting strip; 43. Second mounting strip; 44. Lock hook platform; 44a. Through hole; 45. Driving oil cylinder; 46. Towing pin; 47. Return spring; 48. Mounting bracket; 5. First pawl; 5a. Abutting portion; 6. Second pawl; 7. Push rod; 71. Pressing portion; 72. Push arm; 8. Translational hydraulic oil cylinder; 9. Connecting pin shaft; 10. Return torsion spring; 11. Limit bracket; 12. Connecting bolt; 13. Guide block; 14. Return spring; 15. First mounting frame; 16. Second mounting frame; 17. First pin shaft; 18. Second pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following are specific embodiments of the present invention in combination with the accompanying drawings, further describing the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0030] As Figures 1 to 7As shown, in this embodiment, the adjustment mechanism of the towing hook on the aircraft tractor includes a mounting seat 1 fixedly connected to the frame of the aircraft tractor. On the side of the mounting seat 1, there are a ratchet rack one 2 and a ratchet rack two 3 arranged side by side. The directions of the ratchet teeth on the ratchet rack one 2 and the ratchet rack two 3 are opposite. On one side of the seat body 41 of the towing hook 4, there is a mounting bar one 42 extending upward toward the ratchet rack one 2 and the ratchet rack two 3. On the mounting bar one 42, there are respectively a pawl one 5 engaged with the ratchet rack one 2 and a pawl two 6 engaged with the ratchet rack two 3. On one side of the seat body 41 of the towing hook 4, there is also a mounting bar two 43 extending downward toward the ratchet rack one 2 and the ratchet rack two 3. On the mounting bar two 43, there is a push rod 7 that can push the pawl one 5 away from the ratchet rack one 2 and the pawl two 6 away from the ratchet rack two 3. A translational hydraulic cylinder 8 is arranged between the seat body 41 of the towing hook 4 and the mounting seat 1.

[0031] As Figure 1 , Figure 2 and Figure 5 shown, a connecting pin shaft 9 is arranged on the mounting bar one 42. One ends of the pawl one 5 and the pawl two 6 are sleeved side by side on the connecting pin shaft 9. The other ends of the pawl one 5 and the pawl two 6 both have abutting portions 5a that are arc-shaped and inclined downward. The arc bending directions of the abutting portion 5a of the pawl one 5 and the abutting portion 5a of the pawl two 6 are opposite. A return torsion spring 10 is arranged on the connecting pin shaft 9. The return torsion spring 10 has a tendency to make the abutting portion 5a of the pawl one 5 abut against the ratchet teeth of the ratchet rack one 2 and the abutting portion 5a of the pawl two 6 abut against the ratchet teeth of the ratchet rack two 3. Further, a limiting bracket 11 is fixedly arranged at the outer ends of the ratchet rack one 2 and the ratchet rack two 3 through a connecting bolt 12. The upper side surface of the limiting bracket 11 is flush with the top surfaces of the ratchet teeth of the ratchet rack one 2 and the ratchet rack two 3. The upper side surface of the limiting bracket 11 can also be slightly higher than the top surfaces of the ratchet teeth of the ratchet rack one 2 and the ratchet rack two 3. In this way, the ratchet teeth of the ratchet rack one 2 and the ratchet rack two 3 form a closed loop. If the ratchet rack one 2 and the ratchet rack two 3 do not play a limiting role, it can still ensure that the towing hook 4 and the ratchet rack one 2 and the ratchet rack two 3 restrain each other and do not disengage.

[0032] As Figure 1 and Figure 2As shown, on the other side of the seat body 41 of the towing hook 4, there are provided a locking hook platform 44 and a vertically downward driving oil cylinder 45. The driving oil cylinder 45 is fixedly connected to the seat body 41 of the towing hook 4 through a mounting bracket 48. The locking hook platform 44 is located directly below the driving oil cylinder 45 and is spaced from it. A vertical towing pin 46 is fixedly connected to the output shaft of the driving oil cylinder 45. In this embodiment, the driving oil cylinder 45 is a unidirectional oil cylinder, and a return spring 47 for causing the towing pin 46 to return upward is provided on the mounting bracket 48. The locking hook platform 44 has a through hole 44a and the lower end of the towing pin 46 can be inserted into the through hole 44a; the push rod 7 has a pressing portion 71 extending directly below the through hole 44a. The towing pin 46 and the piston of the unidirectional oil cylinder are in contact under the pressure of the return spring 47 but are not connected. In this technical solution, the towing pin 46 can be automatically lifted and lowered, solving the physical labor of requiring a dedicated person to remove and install the towing pin 46.

[0033] As Figure 1 , Figure 2 and Figure 4 shown, guide blocks 13 are fixedly provided on both sides of the second mounting strip 43. The push rod 7 has two upward push arms 72. The two push arms 72 respectively pass through the corresponding guide blocks 13 and their tops can respectively abut against the first pawl 5 and the second pawl 6. A return spring 14 capable of applying an upward force to the push arm 72 is also provided between the push arm 72 and the guide block 13. The first ratchet rack 2 and the second ratchet rack 3 are integrally formed with the mounting base 1. The first ratchet rack 2 and the second ratchet rack 3 are arranged in parallel and spaced left and right. The width of the first pawl 5 is greater than the width of the first ratchet rack 2. A part of the abutting portion 5a of the first pawl 5 abuts against the first ratchet rack 2, and another part of the abutting portion 5a of the first pawl 5 protrudes outside the first ratchet rack 2 and abuts against one push arm 72 of the push rod 7; the width of the second pawl 6 is greater than the width of the second ratchet rack 3. A part of the abutting portion 5a of the second pawl 6 abuts against the second ratchet rack 3, and another part of the abutting portion 5a of the second pawl 6 protrudes outside the second ratchet rack 3 and abuts against the other push arm 72 of the push rod 7. The first mounting strip 42 and the second mounting strip 43 are integrally formed with the seat body 41 of the towing hook 4. The first mounting strip 42 and the second mounting strip 43 are arranged in parallel and spaced up and down.

[0034] As Figure 2 shown, the side surface of the seat body 41 of the towing hook 4 has a first mounting frame 15. The end of the housing of the translational hydraulic cylinder 8 is hinged to the first mounting frame 15 through a first pin 17. The side surface of the mounting base 1 has a second mounting frame 16. The end of the output shaft of the translational hydraulic cylinder 8 is hinged to the second mounting frame 16 through a second pin 18.

[0035] Its working principle is as follows: Before the aircraft towing bar and the towing hook 4 need to be accurately aligned, the towing pin 46 is pulled up under the action of the towing pin 46 return spring 47, the push rod 7 is pushed up under the action of the return spring 14, the first pawl 5 is separated from the first ratchet rack 2, and the second pawl 6 is separated from the second ratchet rack 3; when accurate alignment is required, the translational hydraulic cylinder 8 is started, and the seat body 41 of the towing hook 4 moves forward and backward relative to the mounting seat 1 under the action of the translational hydraulic cylinder 8. After the connection ring of the towing bar and the through hole 44a on the locking hook platform 44 are aligned, the translational hydraulic cylinder 8 stops working, and the driving cylinder 45 is started. The piston of the driving cylinder 45 moves downward under the action of hydraulic pressure, pushing the towing pin 46 to move downward against the elastic force of the return spring 47. When the towing pin 46 moves to the lower plane of the locking hook platform 44, it pushes the push rod 7 to move downward against the action of the return spring 14 until the towing pin 46 moves to the limit position. At the limit position, the towing pin 46 pushes the push rod 7 away from the first pawl 5 and the second pawl 6. The first pawl 5 and the second pawl 6 are pressed against and hold the first ratchet rack 2 and the second ratchet rack 3 under the action of the return torsion spring 10. When the aircraft tractor pulls the aircraft to move, the first pawl 5 holds the ratchet teeth of the first ratchet rack 2 to limit the relative movement between the mounting seat 1 and the towing hook 4. When the aircraft tractor pushes the aircraft to move, the second pawl 6 holds the ratchet teeth of the second ratchet rack 3 to limit the relative movement between the mounting seat 1 and the towing hook 4; when the aircraft tractor pulls the aircraft to the designated position and the towing bar and the towing hook 4 need to be separated, at this time, the driving cylinder 45 is unloaded, and the towing pin 46 moves upward under the action of the return spring 47. When it moves to the limit position, the aircraft towing bar is removed to achieve the separation of the aircraft towing bar and the towing hook 4. At this time, the push rod 7 moves the first pawl 5 and the second pawl 6 away from the first ratchet rack 2 and the second ratchet rack 3 under the action of the return spring 14. In this embodiment, the upper end of the towing pin 46 has a 20 mm sliding insertion into the mounting bracket 48 to guide the up and down movement of the towing pin 46. In this technical solution, the towing hook 4 can be adjusted 150 mm back and forth, enabling adjustment through this adjustment mechanism in the case of inaccurate alignment of the tractor. There is no need to restart the vehicle to move the vehicle position multiple times, saving time. The staff does not need to work at the rear of the vehicle for a long time, improving the safety of the staff when towing the aircraft.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An adjustment mechanism for a towing hook on an aircraft towing vehicle, comprising a mounting seat (1) fixedly connected to a frame of the aircraft towing vehicle, characterized in that: The side surface of the mounting seat (1) is provided with a ratchet rack 1 (2) and a ratchet rack 2 (3) arranged side by side, and the ratchet teeth on the ratchet rack 1 (2) and the ratchet rack 2 (3) are in opposite directions. One side of the seat body (41) of the traction hook (4) is provided with a mounting bar 1 (42) extending toward the top of the ratchet rack 1 (2) and the ratchet rack 2 (3), and the mounting bar 1 (42) is respectively provided with a ratchet pawl 1 (5) engaged with the ratchet rack 1 (2) and a ratchet pawl 1 (6) engaged with the ratchet rack 2 (3). 3) a ratchet pawl (6) engaged with each other; a mounting bar (43) extending downward toward the ratchet rack (2) and the ratchet rack (3) is provided on one side of the seat body (41) of the traction hook (4); the mounting bar (43) is provided with a push rod (7) capable of pushing the ratchet pawl (5) out of the ratchet rack (2) and the ratchet rack (6) out of the ratchet rack (3); a translation hydraulic cylinder (8) is provided between the seat body (41) of the traction hook (4) and the mounting seat (1); A locking hook platform (44) and a vertically downward driving cylinder (45) are provided on the other side of the base (41) of the traction hook (4). The driving cylinder (45) is fixedly connected to the base (41) of the traction hook (4) through a mounting bracket (48). The locking hook platform (44) is located directly below the driving cylinder (45) and the two are spaced apart. A vertical traction pin (46) is fixedly connected to the output shaft of the driving cylinder (45). The driving oil cylinder (45) is a one-way oil cylinder. The mounting bracket (48) is provided with a return spring (47) for returning the traction pin (46) upward. The locking hook platform (44) is provided with a through hole (44a) and the lower end of the traction pin (46) can be inserted into the through hole (44a). The push rod (7) is provided with a downward pressing portion (71) extending to the bottom of the through hole (44a). Guide blocks (13) are fixed on both sides of the second mounting bar (43), and the push rod (7) has two upward push arms (72). The two push arms (72) pass through the corresponding guide blocks (13) respectively, and the top ends can respectively abut against the first pawl (5) and the second pawl (6). A return spring (14) that can make the push arm (72) rise is also provided between the push arm (72) and the guide block (13).

2. The adjustment mechanism of the towing hook on the aircraft towing vehicle according to claim 1, characterized in that: A connecting pin (9) is provided on the mounting bar (42), one end of the pawl (5) and the pawl (6) are sleeved side by side on the connecting pin (9), and the other end of the pawl (5) and the pawl (6) both have an arc-shaped abutting portion (5a) tilted downward, and the arc-shaped bending directions of the abutting portion (5a) of the pawl (5) and the abutting portion (5a) of the pawl (6) are opposite; a reset torsion spring (10) is provided on the connecting pin (9), and the reset torsion spring (10) has a tendency to make the abutting portion (5a) of the pawl (5) abut on the ratchet teeth of the ratchet rack (2) and the abutting portion (5a) of the pawl (6) abut on the ratchet teeth of the ratchet rack (3).

3. The adjustment mechanism for the towing hook on the aircraft towing vehicle according to claim 2, characterized in that: The outer ends of the ratchet rack 1 (2) and the ratchet rack 2 (3) are also fixed with a limiting bracket (11) through a connecting bolt (12), and the upper side surface of the limiting bracket (11) is flush with the top surface of the ratchet teeth of the ratchet rack 1 (2) and the ratchet rack 2 (3).

4. The adjustment mechanism for the towing hook on the aircraft towing vehicle according to claim 1, characterized in that: The ratchet rack 1 (2) and the ratchet rack 2 (3) are integrally formed with the mounting seat (1). The ratchet rack 1 (2) and the ratchet rack 2 (3) are arranged in parallel and spaced apart from each other. The width of the ratchet 1 (5) is greater than the width of the ratchet rack 1 (2). A portion of the abutting portion (5a) of the ratchet 1 (5) abuts against the ratchet rack 1 (2), and another portion of the abutting portion (5a) of the ratchet 1 (5) protrudes from the ratchet rack 1. The second pawl (6) is wider than the second ratchet rack (3), and a portion of the abutting portion (5a) of the second pawl (6) abuts against the second ratchet rack (3). Another portion of the abutting portion (5a) of the second pawl (6) protrudes outside the second ratchet rack (3) and abuts against another push arm (72) of the push rod (7).

5. The adjustment mechanism for the towing hook on the aircraft towing vehicle according to claim 1, 2 or 3, characterized in that: The first mounting strip (42) and the second mounting strip (43) are integrally formed with the seat body (41) of the traction hook (4), and the first mounting strip (42) and the second mounting strip (43) are arranged in parallel and spaced apart from each other.

6. The adjustment mechanism for the towing hook on the aircraft towing vehicle according to claim 1, 2 or 3, characterized in that: The side surface of the seat body (41) of the traction hook (4) is provided with a mounting frame 1 (15), the housing end of the translation hydraulic oil cylinder (8) is hinged to the mounting frame 1 (15) via a pin 1 (17), and the side surface of the mounting seat (1) is provided with a mounting frame 2 (16), the output shaft end of the translation hydraulic oil cylinder (8) is hinged to the mounting frame 2 (16) via a pin 2 (18).

Images