Automatic locking towing hook mechanism

Abstract

The utility model relates to a mechanical connecting rod, in particular to an automatic locking towing hook mechanism. Comprising a tow hook seat connecting plate and a four-bar mechanism, one side of the tow hook seat connecting plate is connected with a tractor, a plurality of tow hook seats are arranged on the other side of the tow hook seat connecting plate at intervals, and circular holes are formed in the tow hook seats; the four-connecting-rod mechanism comprises a first connecting rod, one end of the first connecting rod is connected with the tractor rack through a rocker arm hinge plate, the other end of the first connecting rod is connected with a second connecting rod, and the end, away from the first connecting rod, of the second connecting rod is connected with a third connecting rod which is longer than the distance between the upper end of the uppermost towing hook seat and the lower end of the lowermost towing hook seat. The third connecting rod can penetrate through the circular hole in a sleeved mode and move up and down relative to the towing hook base, the second connecting rod can rotate around the top end of the third connecting rod, and the first connecting rod rotates around the rocker arm hinge plate. According to the towing hook mechanism, rapid connection and rapid detachment are achieved through the four connecting rods, self-locking is achieved after connection, unhooking is prevented, and the towing hook mechanism is a novel towing hook mechanism.

Description

Technical Field

[0001] The utility model relates to a mechanical connecting rod, in particular to an automatically locked towing hook mechanism. Background Art

[0002] Flatbed trucks are used in airport operations. Flatbed trucks are mainly used to load luggage. Flatbed trucks rely on tractors to provide power to move forward. The tractor needs to be connected to the flatbed truck. When the flatbed truck is towed to a designated location for loading and unloading, the tractor can detach the flatbed truck and connect to another flatbed truck to continue traction work, give full play to the role of the tractor, and improve transportation efficiency. Therefore, the tractor and the flatbed truck need to be frequently connected or disconnected. Generally, the tractor and the flatbed truck are connected by a traction pin. The existing traction pin may be unhooked when encountering bumps. For example, there are many speed bumps in the airport area. When the tractor tows the flatbed truck over the speed bump, the traction pin will jump up and down, and there is a risk of unhooking. Once the traction pin is unhooked during driving, it may cause the flatbed truck to hit an airplane or pedestrians, causing unnecessary losses. Therefore, in actual work, a towing hook mechanism without the risk of unhooking is required. The towing hook mechanism is used to connect the tractor and the flatbed truck. Utility Model Content

[0003] Problem to be solved: Provide a towing hook mechanism for connecting a tractor and a flatbed vehicle, wherein the towing hook mechanism has no risk of unhooking.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automatically locking towing hook mechanism, including a towing hook seat connecting plate and a four-bar linkage, one side of the towing hook seat connecting plate is connected to the towing vehicle, and a plurality of towing hook seats are arranged at intervals on the other side of the towing hook seat connecting plate, and a circular hole is provided on the towing hook seat; the four-bar linkage includes a first connecting rod, one end of the first connecting rod is connected to the tractor frame through a rocker arm hinge plate, the other end of the first connecting rod is connected to the second connecting rod, and the end of the second connecting rod away from the first connecting rod is connected to the third connecting rod, the length of the third connecting rod is greater than the distance between the upper end of the uppermost towing hook seat and the lower end of the lowermost towing hook seat, the third connecting rod can be sleeved through the circular hole and move up and down relative to the towing hook seat, the second connecting rod can rotate around the top end of the third connecting rod, and the first connecting rod can rotate around the rocker arm hinge plate.

[0005] Preferably, one end surface of the rocker arm articulated plate is connected to the tractor frame, and two baffles are arranged at intervals on the other end surface of the rocker arm articulated plate, and the first connecting rod is hinged to the two baffles.

[0006] Preferably, a U-shaped groove 1 is provided under the two baffles, and the first connecting rod includes rocker arm 1 and rocker arm 2, rocker arm 1 and rocker arm 2 are welded structures, one end of rocker arm 2 is connected to a push-pull rod, the push-pull rod is connected to the handle through rocker arm 3, rocker arm 3 and the handle are an integrally welded structure, and the handle and the handle hinge plate are hinged through a rotating shaft.

[0007] Preferably, the handle hinge plate is provided with a U-shaped groove 2, one end of the rocker arm 3 passes through the U-shaped groove 2 and is connected to the rotating shaft, and the other end of the rocker arm 3 is connected to the push-pull rod.

[0008] Preferably, a handle is provided on the rocker arm.

[0009] Preferably, a limit block 1 is provided above the two baffles to limit the maximum counterclockwise rotation angle of the rocker arm 2.

[0010] Preferably, a second limit block is provided directly below the handle, and the second limit block is located on the hinge plate of the handle to limit the maximum clockwise rotation angle of the handle.

[0011] Compared with the prior art, the utility model provides an automatically locked towing hook mechanism, which has the following beneficial effects:

[0012] 1. The driver does not need to step out of the cockpit to operate behind the tractor. The four-bar linkage is driven by the handle to connect or disconnect the tractor and the flatbed truck.

[0013] 2. If Figure 1 As shown, the four-bar linkage is in a locked state. When encountering bumps, since point C is below the line connecting A and B, a downward force is exerted on the third link, and the four-bar linkage completes self-locking without the risk of uncoupling, thus preventing the flatbed truck and the tractor from separating due to bumps.

[0014] 3. The longitudinal displacement of the third connecting rod is between the uppermost towing hook seat and the lowermost towing hook seat through limit blocks 1 and 2. When the third connecting rod moves to the highest point, it will not separate from the uppermost towing hook seat. When the third connecting rod moves to the lowest point, the bottom end of the third connecting rod is lower than the bottom end of the lowermost towing hook seat, thus completing the stable connection between the tractor and the flatbed truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram when the third connecting rod of the utility model is at the highest point.

[0017] Figure 3 This is a schematic diagram of the four-bar linkage mechanism of the utility model.

[0018] Explanation of the accompanying drawings: 1. Tow hook seat connecting plate; 11. Tow hook seat; 12. Circular hole; 2. Four-bar linkage; 21. First link; 211. Rocker arm one; 213. Handle; 212. Rocker arm two; 22. Second link; 23. Third link; 3. Rocker arm hinge plate; 31. Baffle; 311. Limit block one; 32. U-shaped groove one; 4. Push-pull rod; 5. Handle hinge plate; 51. Rotating shaft; 52. U-shaped groove two; 53. Limit block two; 6. Handle; 7. Rocker arm three. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiment of the present invention will be described below in conjunction with the accompanying drawings in the embodiment of the present invention:

[0020] A towing hook mechanism with automatic locking comprises a towing hook seat connecting plate 1 and a four-link mechanism 2, wherein one side of the towing hook seat connecting plate 1 is connected to a towing vehicle, and three towing hook seats 11 are arranged in parallel at intervals on the other side of the towing hook seat connecting plate 1, and a circular hole 12 is arranged on the towing hook seat 11; the four-link mechanism 2 comprises a first link 21, one end of the first link 21 is hinged to a frame of the towing vehicle, the other end of the first link 21 is connected to a second link 22, the second link 22 is the shortest rod in the four-link mechanism and serves as a connecting rod of the four-link mechanism, one end of the second link 22 away from the first link 21 is connected to a third link 23, the first link 21 and the third link 23 act as connecting rods of the four-link mechanism, the length of the third link 23 is greater than the distance between the upper end of the uppermost towing hook seat 11 and the lower end of the lowermost towing hook seat 11, the third link 23 can be sleeved through the circular hole 12 and move up and down relative to the towing hook seat 11, and there is a clearance fit between the third link 23 and the circular hole 12. When the tractor and flatbed truck are connected, Figure 1 As shown, the upper boss of the third link 23 fits with the upper end of the first layer of towing hook seat 11, and the bottom end of the third link 23 is 20mm-30mm lower than the bottom end of the lowest layer of towing hook seat 11, then it is in a locked state, the connection between the second link 22 and the third link 23 is point A, the hinge between the first link 21 and the tractor frame is point B, the connection between the first link 21 and the second link 22 is point C, and point C is below the line connecting point A and point B. The towing hook seat connecting plate 1 and point B constitute the frame part of the four-bar mechanism, so the four-bar mechanism 2 can be regarded as a double rocker mechanism.

[0021] In order to facilitate the up and down movement of the third link 23, a handle 213 is provided on the first link 21, and the handle 213 is provided at one end close to the second link 22. Since the first link 21 is hinged to the tractor frame, when the flatbed truck is detached from the tractor, the first link 21 rotates clockwise with point B as the center by pulling the handle 213. During this process, point C rotates clockwise around point B, and point C rotates counterclockwise around point A, that is, the second link 22 rotates counterclockwise around point A. When the second link 22 rotates to the vertical direction, it is in line with the third link 23. At this time, the first link 21 continues to rotate clockwise, which will drive the second link 22 to continue to rotate counterclockwise and the third link 23 to move upward; when point C rotates to the level of the line between B and C, the second link 22 deflects a certain angle to the left in the vertical direction, and point C continues to rotate clockwise, which drives the second link 22 to rotate clockwise, and the maximum displacement of the third link 23 upward is satisfied when the bottom end of the third link 23 is 5mm-10mm lower than the bottom end of the uppermost towing hook seat 11. At this time, the tractor and the flatbed are in a disengaged state, that is, Figure 2 In the state shown, the third connecting rod 23 will not be separated from the uppermost towing hook seat 11 .

[0022] In order to facilitate the driver in the tractor to operate in the cab, the first connecting rod 21 is connected to the tractor frame through the rocker arm hinge plate 3. One end face of the rocker arm hinge plate 3 is connected to the tractor frame, and two baffles 31 are arranged at intervals on the other end face of the rocker arm hinge plate 3. The first connecting rod 21 is hinged to the two baffles 31. The rocker arm hinge plate 3 is provided with a U-shaped groove 32, and the U-shaped groove 32 is located at the lower position between the two baffles 31. The first connecting rod 21 includes a rocker arm 1 211 and a rocker arm 212. The rocker arm 1 211 and the rocker arm 212 are welded structures and are hinged to the two baffles 31. The rocker arm 1 211 and the rocker arm 212 rotate in the same direction and at the same angle. The rocker arm 1 211 is connected to the second connecting rod 22. One end of the rocker arm 212 is connected to a push-pull rod 4, and the push-pull rod 4 is connected to the handle 6 through the rocker arm 3 7. The handle 6 and the rocker arm 3 7 are welded as an integral structure and are hinged to the handle hinge plate 5. The handle hinge plate 5 includes a rotating shaft 51. The handle 6 and the rocker arm 3 7 are both sleeved on the rotating shaft 51 to realize the hinge connection with the handle hinge plate 5. The rocker arm 3 7 and the handle 6 rotate in the same direction and at the same angle with the rotating shaft 51 as the center. The two ends of the push-pull rod 4 are respectively connected to the rocker arm 212 and the rocker arm 3 7 through joint bearings. The handle hinge plate 5 is provided with a U-shaped groove 2 52, one end of the rocker arm 3 7 passes through the U-shaped groove 2 52 and is connected to the rotating shaft 51, and the other end of the rocker arm 3 7 is connected to the push-pull rod 4. The rocker arm 3 7 drives the push-pull rod 4 to move toward the direction of point B during the clockwise rotation of the rotating shaft 51. The end of the push-pull rod 4 close to point B is connected to the rocker arm 2 212, which in turn drives the rocker arm 2 212 to rotate clockwise around point B. The rocker arm 1 211 rotates in the same direction and angle as the rocker arm 2 212, and the rocker arm 1 211 moves clockwise around point B, that is, point C moves clockwise around point B. The first link 21 rotates clockwise, and point C rotates counterclockwise around point A, that is, the second link 22 rotates counterclockwise around point A. When the second link 22 rotates to the vertical direction, it is in line with the third link 23. At this time, the first link 21 continues to rotate clockwise to drive the second link 22 to continue to rotate counterclockwise, and the third link 23 moves upward. The maximum displacement of the third link 23 upward movement satisfies that the bottom end of the third link 23 is still located at the lower end of the uppermost towing hook seat 11, so that the third link 23 will not be completely separated from the uppermost towing hook seat 11. For easy operation, a handle 213 is provided on the rocker arm 1 211, which can meet the operation requirements inside and outside the cockpit in combination with the handle 6.

[0023] The key point of the utility model is that the first connecting rod 21 rotates around the point B and drives the third connecting rod 23 to move up and down, so as to ensure that the bottom end of the third connecting rod 23 is 20mm-30mm lower than the bottom end of the lowest towing hook seat 11 when in the locked state, and to ensure that the bottom end of the third connecting rod 23 is about 5mm-10mm lower than the bottom end of the uppermost towing hook seat 11 when the flatbed vehicle is detached. A limit block 311 is provided above the two baffles 31 to limit the maximum counterclockwise rotation angle of the rocker arm 212, that is, the lowest position of the rocker arm 211. When the rocker arm 212 is against the limit block 311, the point C is at the lowest position, that is, Figure 1 The third connecting rod 23 and the towing hook seat 11 are in a locked state. The upper boss of the third connecting rod 23 falls on the upper end of the first layer of the towing hook seat 11 and the bottom end of the third connecting rod 23 is 20mm-30mm lower than the bottom end of the bottom layer of the towing hook seat 11. Point C is located below the line connecting points A and B. This structure will not have the risk of unhooking even when encountering bumps. The specific principle is as follows Figure 3 As shown, when encountering bumps, the third link is subjected to an upward force F, and F will decompose into a force F1 along the direction of the second link 22, extending F1 along the direction of the second link 22. Since the rotation center of the first link 21 is point B, the vertical line from point B to the extension line of F1 is the lever arm. This lever arm will cause point C to have a tendency to rotate counterclockwise around point B. The result of point C rotating counterclockwise around point B is that point C rotates clockwise around point A, that is, the second link 22 will rotate clockwise around point A, exerting a downward force on the third link 23, thereby inhibiting the third link 23 from moving upward and causing uncoupling. If point C is located above the line connecting point A and point B, that is, point C is located at the position of C1, the third link receives an upward force F during bumping, and F has a force F2 along the direction of AC1. Point B is the rotation center, and the vertical line segment from point B to the straight line where F2 is located is the force arm of F2, which will cause C1 to have a clockwise movement trend. Once C1 moves clockwise, it will drive the third link 23 to move upward, and there is a decoupling situation. Therefore, in the case of Figure 1 In the locked state shown, point C is located below the line connecting point A and point B, so that the towing hook mechanism of the utility model can achieve self-locking and avoid losses caused by the towing hook.

[0024] A second limit block 53 is provided directly below the handle 6. The limit block 53 is located on the handle hinge plate 5 to limit the maximum clockwise rotation angle of the handle 6, thereby limiting the maximum rotation angle of the first connecting rod 21. The final result is that the maximum longitudinal displacement of the third connecting rod 23 is limited, thereby ensuring that when the flatbed truck is detached, the bottom end of the third connecting rod 23 is about 5 mm lower than the bottom end of the uppermost towing hook seat 11, so that the third connecting rod 23 will not be completely separated from the uppermost towing hook seat 11.

[0025] The above embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. An automatically locked towing hook mechanism, comprising a towing hook seat connecting plate (1) and a four-link mechanism (2), wherein one side of the towing hook seat connecting plate (1) is connected to a towing vehicle, and the other side of the towing hook seat connecting plate (1) is provided with a plurality of towing hook seats (11) at intervals, and a circular hole (12) is provided on the towing hook seat (11); the four-link mechanism (2) comprises a first link (21), one end of the first link (21) is connected to a towing vehicle frame through a rocker arm hinge plate (3), the other end of the first link (21) is connected to a second link (22), and the end of the second link (22) away from the first link (21) is connected to a third link (23), characterized in that: The length of the third connecting rod (23) is greater than the distance between the upper end of the uppermost towing hook seat (11) and the lower end of the lowermost towing hook seat (11); the third connecting rod (23) can be sleeved through the circular hole (12) and move up and down relative to the towing hook seat (11); the second connecting rod (22) can rotate around the top end of the third connecting rod (23); and the first connecting rod (21) can rotate around the rocker arm hinge plate (3).

2. The automatic locking towing hook mechanism according to claim 1, characterized in that: One end face of the rocker arm hinge plate (3) is connected to the tractor frame, and two baffles (31) are arranged at intervals on the other end face of the rocker arm hinge plate (3), and the first connecting rod (21) is hinged to the two baffles (31).

3. The automatic locking towing hook mechanism according to claim 2, characterized in that: A U-shaped groove 1 (32) is provided below the two baffles (31). The first connecting rod (21) comprises a rocker arm 1 (211) and a rocker arm 2 (212). The rocker arm 1 (211) and the rocker arm 2 (212) are welded structures. One end of the rocker arm 2 (212) is connected to a push-pull rod (4). The push-pull rod (4) is connected to a handle (6) via a rocker arm 3 (7). The rocker arm 3 (7) and the handle (6) are an integrally welded structure. The handle (6) and the handle hinge plate (5) are hinged via a rotating shaft (51).

4. An automatic locking towing hook mechanism as claimed in claim 3, characterized in that: The handle hinge plate (5) is provided with a second U-shaped groove (52), one end of the third rocker arm (7) passes through the second U-shaped groove (52) and is connected to the rotating shaft (51), and the other end of the third rocker arm (7) is connected to the push-pull rod (4).

5. The automatic locking towing hook mechanism according to claim 4, characterized in that: A handle (213) is provided on the rocker arm 1 (211).

6. The automatic locking towing hook mechanism according to claim 2, characterized in that: A limit block 1 (311) is provided above the two baffles (31) to limit the maximum counterclockwise rotation angle of the rocker arm 2 (212).

7. The automatic locking towing hook mechanism according to claim 3, characterized in that: A second limit block (53) is arranged directly below the handle (6). The second limit block (53) is located on the handle hinge plate (5) to limit the maximum clockwise rotation angle of the handle (6).

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