Large-tonnage supporting and pulling connecting device

Abstract

The invention provides a large-tonnage supporting and pulling connecting device. The large-tonnage supporting and pulling connecting device comprises a frame, a connecting arm, a supporting frame, a supporting seat, a rotating sleeve, a transverse rod, a moving sleeve and a supporting rod. According to the large-tonnage supporting and pulling connecting device, the rotating sleeve is rotationally arranged on the supporting frame, the two moving sleeves are slidably arranged on the connecting arm in the first direction, and the supporting rods are hinged between the two moving sleeves and the rotating sleeve. The movable sleeves are located at the tail ends of the connecting arms, and therefore the position between the two movable sleeves can be conveniently adjusted. According to the supporting frame, when the supporting frame needs to be unfolded, the distance between the two movable sleeves is adjusted, so that the supporting frame can be driven to turn over through the supporting rods, and the operation of unfolding or folding the supporting frame is achieved. And the two movable sleeves are located at the tail ends of the connecting arms, so that the operation of operators is facilitated, and the operators can complete the unfolding or folding operation of the supporting frame conveniently.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle rescue, and in particular relates to a large-tonnage towing connection device. Background Art

[0002] A large-tonnage supporting device is usually installed on the vehicle body. The supporting arm on the supporting device can be used to support the ground, and play a role of reverse support when pulling the accident vehicle. At the same time, the supporting device can also lift the front of the accident vehicle, connect the accident vehicle and the rescue vehicle together, and play a role in transporting the accident vehicle. When the rescue vehicle is driving alone, it is usually necessary to store the supporting device on the rescue vehicle. At present, the supporting device is installed on the rescue vehicle through a traction seat. When the supporting device is stored on the rescue vehicle, in order to reduce the force on the traction seat, a support rod is usually hinged on the connecting arm of the supporting device. When the supporting device is stored on the rescue vehicle, the supporting rod can play a role of auxiliary support for the connecting arm. However, the support rod is usually located inside the connecting arm, and it is inconvenient for the operator to open or store the support rod, which is not convenient for the support operation of the supporting device. Summary of the invention

[0003] The embodiment of the present invention provides a large-tonnage towing connection device, aiming to solve the problem in the prior art that the large-tonnage towing device is connected to a rescue vehicle and is not convenient for the towing device to be stored on the rescue vehicle.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a large-tonnage supporting and pulling connection device, comprising:

[0005] Frame;

[0006] A connecting arm, mounted on the frame;

[0007] A support frame, one end of which is hingedly arranged on the connecting arm, and the axial length direction of the hinge axis of the support frame on the connecting arm is defined as a first direction;

[0008] A support seat, mounted on the frame, and when the support frame is rotated to a vertical state, it can abut against the support seat;

[0009] A rotating sleeve, rotatably disposed on the support frame, wherein the axis of the rotating sleeve is disposed along a first direction;

[0010] A cross bar, fixedly mounted on the connecting arm, wherein the length direction of the cross bar is arranged along a first direction;

[0011] There are two movable sleeves, both of which are rotatably arranged on the cross bar, and the positions of the two movable sleeves on the cross bar have a degree of freedom to be adjusted along a first direction;

[0012] There are two support rods, one end of each of the two support rods is hingedly arranged on the two movable sleeves, and the other end of each of the two support rods is hingedly arranged on the rotating sleeves.

[0013] In a possible implementation, the frame is further provided with a driving unit for driving the moving sleeve to move on the cross bar, and the driving unit includes:

[0014] There are two moving blocks, and the positions of the two moving blocks on the frame have a degree of freedom to be adjusted along a first direction;

[0015] The driving rod has one end hingedly arranged on the moving block, and the other end is fixedly provided with a hook for hanging on the outside of the moving sleeve, and the outside of the moving sleeve is provided with an annular groove for accommodating the hook.

[0016] In a possible implementation, a screw is rotatably provided on the frame, one end of the screw extends to the outside of the frame, and both of the two moving blocks are provided with threaded holes threadedly connected to the screw, and the threaded holes on the two moving blocks have opposite rotation directions.

[0017] In a possible implementation, the support base is further provided with a limiting unit for limiting an end of the support frame away from the connecting arm on the support base.

[0018] In a possible implementation, the limiting unit includes:

[0019] A first ratchet wheel is rotatably disposed on the support seat, and teeth are disposed on the outer side of the first ratchet wheel, and the end of the teeth can extend out of the top of the support seat and abut against one side of the support frame to limit the support frame from flipping in a direction close to the connecting arm;

[0020] The anti-rotation assembly is arranged between the first ratchet and the frame, and is used to limit the first ratchet to drive the teeth to rotate in a direction away from the support frame.

[0021] In a possible implementation, the anti-rotation component includes:

[0022] A second ratchet wheel, coaxially arranged with the first ratchet wheel and fixedly connected;

[0023] A pawl, one end of which is hingedly arranged on the frame, and the other end of which can abut against the outer side of the second ratchet wheel to limit the rotation of the second ratchet wheel;

[0024] A driving assembly is installed between the frame and the pawl, and is used to drive the pawl to swing on the frame.

[0025] In a possible implementation, the driving component includes:

[0026] A first connecting rod, one end of which is fixedly connected to a hinge shaft of the pawl on the frame;

[0027] A second connecting rod is hingedly connected to an end of the first connecting rod away from the pawl;

[0028] A sliding block is slidably arranged on the frame, and the other end of the second connecting rod is hingedly arranged on the sliding block;

[0029] An elastic member, installed between the sliding block and the frame, and used for pushing the sliding block to move toward the direction close to the pawl;

[0030] The pushing assembly is arranged between the sliding block and the frame, and is used for pushing the sliding block to move in a direction away from the ratchet.

[0031] In a possible implementation, the pushing component includes:

[0032] A rotating rod, rotatably arranged on the frame, wherein the length direction of the rotating rod is arranged along the sliding arrangement of the sliding block;

[0033] A pushing block is threadedly connected to the rotating rod, and the pushing block abuts against a side of the sliding block close to the ratchet.

[0034] In a possible implementation, a transmission rod is rotatably provided on the frame, one end of the transmission rod is located outside the frame, and the transmission rod is transmission-connected to the rotating rod.

[0035] In a possible implementation, a worm is fixedly mounted on the transmission rod, the worm is coaxially arranged with the transmission rod, and a worm wheel is fixedly mounted on the rotating rod, the worm wheel is coaxially arranged with the rotating rod and meshes with the worm.

[0036] The scheme shown in the embodiment of the present application, compared with the prior art, is provided with a frame, and the frame and the connecting arm are connected together through a traction seat. A support frame is hingedly provided on the connecting arm, and when the connecting arm is stored on the frame, the support frame can be unfolded so that the support frame is against the support seat. It plays a role in supporting the connecting arm. In the present application, a rotating sleeve is rotatably provided on the support frame, and two movable sleeves are slidably provided on the connecting arm along a first direction, and a support rod is hingedly connected between the two movable sleeves and the rotating sleeve. The movable sleeve is located at the tail end of the connecting arm, so as to facilitate the adjustment of the position between the two movable sleeves. In the present application, when the support frame needs to be unfolded, the spacing between the two movable sleeves can be adjusted so that the support frame can be driven to flip through the support rod to realize the operation of unfolding or folding the support frame. And the two movable sleeves are located at the tail end of the connecting arm, which is convenient for the operator to operate, so as to facilitate the operator to complete the operation of unfolding or folding the support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of a large-tonnage supporting and connecting device provided in an embodiment of the present invention Figure 1 ;

[0038] Figure 2 A schematic diagram of the structure of a large-tonnage supporting and connecting device provided in an embodiment of the present invention Figure 2 ;

[0039] Figure 3 A schematic diagram of the structure of a drive unit provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the installation structure of the limit unit provided in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the installation structure of a drive assembly provided in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Frame; 2. Connecting arm; 21. Cross bar; 211. Moving sleeve; 22. Support rod; 3. Support frame; 31. Rotating sleeve; 4. Support seat; 5. Driving unit; 51. Moving block; 52. Driving rod; 53. Screw; 6. Limiting unit; 61. First ratchet; 62. Anti-rotation assembly; 621. Second ratchet; 622. Ratchet; 63. Driving assembly; 631. First connecting rod; 632. Second connecting rod; 633. Sliding block; 634. Elastic member; 64. Pushing assembly; 641. Rotating rod; 642. Pushing block; 643. Transmission rod; 65. Worm; 66. Worm wheel. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] Please also read Figures 1 to 5 The large-tonnage towing connection device provided by the present invention is now described. The large-tonnage towing connection device comprises a frame 1, a connecting arm 2, a support frame 3, a support seat 4, a rotating sleeve 31, a cross bar 21, a moving sleeve 211 and a support rod 22. The connecting arm 2 is installed on the frame 1; one end of the support frame 3 is hingedly set on the connecting arm 2, and the axial length direction of the hinge axis of the support frame 3 on the connecting arm 2 is defined as the first direction; the support seat 4 is installed on the frame 1, and when the support frame 3 is rotated to a vertical state, it can rest on the support seat 4; the rotating sleeve 31 is rotatably set on the support frame 3, and the axis of the rotating sleeve 31 is set along the first direction; the cross bar 21 is fixedly installed on the connecting arm 2, and the length direction of the cross bar 21 is set along the first direction; there are two movable sleeves 211, and the two movable sleeves 211 are both rotatably set on the cross bar 21, and the positions of the two movable sleeves 211 on the cross bar 21 have the freedom to be adjusted along the first direction; there are two support rods 22, one end of the two support rods 22 is respectively hingedly set on the two movable sleeves 211, and the other ends of the two support rods 22 are respectively hingedly set on the rotating sleeves 31.

[0046] Compared with the prior art, the large-tonnage towing connection device provided in this embodiment is provided with a frame 1, and the frame 1 and the connecting arm 2 are connected together through a traction seat. A support frame 3 is hingedly provided on the connecting arm 2. When the connecting arm 2 is stored on the frame 1, the support frame 3 can be unfolded so that the support frame 3 is against the support seat 4. It plays a role in supporting the connecting arm 2. In this application, a rotating sleeve 31 is rotatably provided on the support frame 3, and two movable sleeves 211 are slidably provided on the connecting arm 2 along the first direction, and a support rod 22 is hingedly connected between the two movable sleeves 211 and the rotating sleeve 31. The movable sleeve 211 is located at the tail end of the connecting arm 2, so as to facilitate the adjustment of the position between the two movable sleeves 211. In this application, when it is necessary to unfold the support frame 3, the spacing between the two movable sleeves 211 can be adjusted so that the support frame 3 can be driven to flip through the support rod 22 to realize the operation of unfolding or accommodating the support frame 3. In addition, the two movable sleeves 211 are located at the rear end of the connecting arm 2 , which is convenient for the operator to operate, thereby facilitating the operator to complete the operation of unfolding or folding the support frame 3 .

[0047] Specifically, in this embodiment, a tension spring is provided between the connecting arm 2 and the supporting frame 3 for pulling the supporting frame 3 to swing toward the connecting arm 2. Thus, when the supporting device is working, the supporting frame 3 is prevented from being unfolded from the connecting arm 2.

[0048] Specifically, in this embodiment, the traction seat is a prior art, and the connection method between the traction seat and the frame 1 and the connecting arm 2 is a prior art and will not be described here. At the same time, the connecting arm 2 is the part where the supporting device is connected to the frame 1.

[0049] In some embodiments, the driving unit 5 may be configured as follows: Figure 2 , Figure 3 See also Figure 2 , Figure 3 , the frame 1 is also provided with a driving unit 5 for driving the moving sleeve 211 to move on the cross bar 21, and the driving unit 5 includes a moving block 51 and a driving rod 52. There are two moving blocks 51, and the positions of the two moving blocks 51 on the frame 1 have the freedom to be adjusted along the first direction; one end of the driving rod 52 is hingedly arranged on the moving block 51, and the other end is fixedly installed with a hook for hanging on the outside of the moving sleeve 211, and the outside of the moving sleeve 211 is provided with an annular groove for accommodating the hook. Two moving blocks 51 are slidably arranged on the frame 1 along the first direction, and the two moving blocks 51 can move in a direction relatively close or relatively far away on the frame 1. When in use, the two moving blocks 51 are moved to the position where the driving rod 52 can be hung on the annular groove outside the moving sleeve 211, and the driving rod 52 is rotated so that the hook at the end of the driving rod 52 is hung inside the annular groove, and then the two moving blocks 51 are moved relative to each other so that the two moving sleeves 211 can be driven to move relative to each other by the driving rod 52.

[0050] Preferably, in this embodiment, a slot for accommodating the driving rod 52 is further provided on the vehicle frame 1, and the slot is located on both sides of the projection of the connecting arm 2 in the vertical direction. The slot is composed of two baffles arranged at intervals, and limit pins are also inserted on the two baffles, and the driving rod 52 can be limited inside the slot by the limit pins, so that the driving rod 52 is stored.

[0051] In some embodiments, the moving block 51 may be implemented as follows: Figure 3 See the structure shown. Figure 3 , a screw rod 53 is rotatably provided on the frame 1, one end of the screw rod 53 extends to the outside of the frame 1, and threaded holes threadedly connected to the screw rod 53 are provided on the two moving blocks 51, and the threaded holes on the two moving blocks 51 have opposite rotation directions. A screw rod 53 is rotatably provided at the tail of the frame 1, and two threaded parts are provided on the screw rod 53, the rotation directions of the two threaded parts are opposite, and the two threaded parts are respectively threadedly connected to the two moving blocks 51. By rotating the screw rod 53, the two moving blocks 51 can be driven to move relative to each other at the same time. At the same time, one end of the screw rod 53 is located on the outside of the frame 1, and a drive sleeve is fixedly installed on the end of the screw rod 53 located on the outside of the frame 1, the drive sleeve is coaxially arranged with the screw rod 53, and a regular hexagonal inner hole is arranged inside the drive sleeve, so that it is convenient to use a tool to rotate the drive sleeve, thereby conveniently driving the screw rod 53 to rotate.

[0052] In some embodiments, the support base 4 may be Figure 2 , Figure 4 See also Figure 2 , Figure 4 The support seat 4 is also provided with a limiting unit 6 for limiting the end of the support frame 3 away from the connecting arm 2 on the support seat 4. The support seat 4 is also provided with a limiting unit 6 for limiting the support frame 3 on the support seat 4 when the support frame 3 abuts against the support seat 4. The setting of the limiting unit 6 can prevent the support frame 3 from being separated from the support seat 4 after the driving rod 52 is separated from the moving sleeve 211, thereby affecting the supporting effect on the connecting arm 2. An effective supporting effect on the connecting arm 2 is ensured.

[0053] Preferably, in this embodiment, the top of the support seat 4 is tilted from top to bottom toward the direction close to the support frame 3, and a support block for abutting against the top surface of the support seat 4 is fixedly installed at the bottom of the support frame 3, and the bottom surface of the support block is an inclined surface arranged parallel to the top of the support seat 4. When the support frame 3 rotates to a vertical state, the support block abuts against the top surface of the support seat 4, and the support frame 3 continues to flip forward through the inclined surface.

[0054] In some embodiments, the above-mentioned limiting unit 6 can be adopted as follows Figure 4 See the structure shown. Figure 4 The limiting unit 6 includes a first ratchet 61 and an anti-rotation assembly 62. The first ratchet 61 is rotatably arranged on the support seat 4, and teeth are arranged on the outer side of the first ratchet 61. The end of the teeth can extend out of the top of the support seat 4 and abut against one side of the support frame 3 to limit the support frame 3 from turning in the direction close to the connecting arm 2; the anti-rotation assembly 62 is arranged between the first ratchet 61 and the frame 1, and is used to limit the first ratchet 61 to drive the teeth to rotate in the direction away from the support frame 3. The first ratchet 61 is rotatably arranged on the support seat 4, and the end of the teeth on the first ratchet 61 away from the ratchet axis can extend out of the top surface of the support seat 4. When the support frame 3 swings toward the support seat 4, the bottom end of the support frame 3 abuts against the outer side of the teeth of the first ratchet 61, driving the first ratchet 61 to rotate. When the support frame 3 rotates to a vertical state, the rear teeth of the first ratchet 61 limit the bottom end of the support frame 3 on the support seat 4, and the first ratchet 61 can only rotate in one direction through the anti-rotation component 62, thereby limiting the support frame 3 on the support seat 4.

[0055] Specifically, in the present embodiment, a plurality of teeth are provided on the outer side of the first ratchet wheel 61 , and the plurality of teeth are evenly spaced apart on the outer side of the first ratchet wheel 61 along the circumference of the first ratchet wheel 61 .

[0056] In some embodiments, the anti-rotation component 62 may be configured as follows: Figure 4 , Figure 5See also Figure 4 , Figure 5 The anti-rotation assembly 62 includes a second ratchet 621, a pawl 622 and a driving assembly 63. The second ratchet 621 is coaxially arranged and fixedly connected with the first ratchet 61; one end of the pawl 622 is hingedly arranged on the frame 1, and the other end can abut against the outer side of the second ratchet 621 to limit the rotation of the second ratchet 621; the driving assembly 63 is installed between the frame 1 and the pawl 622, and is used to drive the pawl 622 to swing on the frame 1. Two support seats 4 are fixedly installed on the frame 1, and the two support seats 4 are spaced along the first direction. The first ratchet 61 is rotatably arranged on the two support seats 4, and the two first ratchet wheels 61 are coaxially arranged. A transmission shaft is fixedly connected between the two first ratchets 61, and the second ratchet 621 is fixedly installed on the transmission shaft, and the inclination direction of the teeth on the second ratchet 621 is opposite to the inclination direction of the teeth on the first ratchet 61. A pawl 622 is also hingedly provided on the vehicle frame 1 and is engaged with the teeth on the second ratchet 621. When the pawl 622 abuts against the teeth of the second ratchet 621, the second ratchet 621 can be limited to rotate, thereby limiting the rotation of the first ratchet 61. When the support frame 3 needs to be retracted, the driving assembly 63 can drive the pawl 622 to swing away from the second ratchet 621, so that the second ratchet 621 can rotate freely to contact the first ratchet 61.

[0057] In some embodiments, the drive assembly 63 may be configured as follows: Figure 5 See the structure shown. Figure 5 The driving assembly 63 includes a first connecting rod 631, a second connecting rod 632, a sliding block 633, an elastic member 634 and a pushing assembly 64. One end of the first connecting rod 631 is fixedly connected to the hinge shaft of the pawl 622 on the frame 1; the second connecting rod 632 is hingedly connected to the end of the first connecting rod 631 away from the pawl 622; the sliding block 633 is slidably set on the frame 1, and the other end of the second connecting rod 632 is hingedly set on the sliding block 633; ​​the elastic member 634 is installed between the sliding block 633 and the frame 1, and is used to push the sliding block 633 to move in the direction close to the pawl 622; the pushing assembly 64 is installed between the sliding block 633 and the frame 1, and is used to push the sliding block 633 to move in the direction away from the pawl 622. One end of the first connecting rod 631 is fixedly installed on the rotating shaft of the pawl 622, and the pawl 622 is fixedly connected to the rotating shaft, so that when the first connecting rod 631 swings, it can drive the pawl 622 to move and swing. A sliding block 633 is slidably arranged on the vehicle frame 1. The width direction of the vehicle frame 1 is a first direction, and the length direction of the vehicle frame 1 is a second direction. The sliding block 633 is slidably arranged on the vehicle frame 1 along the second direction. When the sliding block 633 moves in a direction away from the ratchet wheel, the second connecting rod 632 drives the first connecting rod 631 to swing downward, so that the ratchet 622 is disengaged from the teeth on the second ratchet wheel 621.

[0058] Specifically, in this embodiment, the elastic member 634 is a spring, and the elastic member 634 can push the sliding block 633 to move in the direction close to the pawl 622. When the first ratchet 61 drives the second ratchet 621 to rotate, the elastic member 634 can also buffer the sliding block 633, so that the pawl 622 can always rest against the outside of the ratchet, thereby automatically limiting the second ratchet 621. When the pawl 622 needs to disengage from the ratchet, the pawl 622 can be driven to swing in the direction away from the second ratchet 621 by pushing the component 64, thereby realizing the pawl 622 disengaging from the ratchet.

[0059] In some embodiments, the pushing assembly 64 may be implemented as follows: Figure 5 See the structure shown. Figure 5 The pushing assembly 64 includes a rotating rod 641 and a pushing block 642. The rotating rod 641 is rotatably arranged on the vehicle frame 1, and the length direction of the rotating rod 641 is arranged along the sliding arrangement of the sliding block 633; ​​the pushing block 642 is threadedly connected to the rotating rod 641, and the pushing block 642 abuts against the side of the sliding block 633 close to the pawl 622. The rotating rod 641 is rotatably arranged on the vehicle frame 1, and the rotating rod 641 is a screw rod 53, and the pushing block 642 is threadedly connected to the rotating rod 641. The pushing block 642 abuts against the side of the sliding block 633 close to the pawl 622. Therefore, the sliding block 633 can be driven to move in a direction away from the pawl 622 by the pushing block 642.

[0060] Specifically, in this embodiment, a guide column is fixedly installed on the frame 1 and is arranged along the second direction in the length direction, and the pushing block 642 and the sliding block 633 are both slidably arranged on the guide column.

[0061] In some embodiments, the rotating rod 641 may be Figure 5 See the structure shown. Figure 5 A transmission rod 643 is also rotatably provided on the vehicle frame 1, one end of the transmission rod 643 is located outside the vehicle frame 1, and the transmission rod 643 is in transmission connection with the rotating rod 641. A transmission rod 643 is also rotatably provided on the vehicle frame 1, the length direction of the transmission rod 643 is arranged along the first direction, the length direction of the rotating rod 641 is arranged along the second direction, and the transmission rod 643 is in transmission connection with the rotating rod 641, one end of the transmission rod 643 is located outside the vehicle frame 1, and a driving sleeve is fixedly installed on the end of the transmission rod 643 located outside the vehicle frame 1, the driving sleeve is coaxially arranged with the transmission rod 643, and a regular hexagonal inner hole is arranged inside the driving sleeve, so that it is convenient to use a tool to rotate the driving sleeve, thereby conveniently driving the transmission rod 643 to rotate. The operator can control the rotation of the transmission rod 643 from the outside of the vehicle frame 1.

[0062] In some embodiments, the transmission rod 643 may be Figure 5See the structure shown. Figure 5 A worm 65 is fixedly mounted on the transmission rod 643, and the worm 65 is coaxially arranged with the transmission rod 643. A worm wheel 66 is fixedly mounted on the rotating rod 641, and the worm wheel 66 is coaxially arranged with the rotating rod 641 and is meshed with the worm 65. The transmission rod 643 and the rotating rod 641 are connected in a worm wheel 66 and a worm 65. The rotating rod 641 can be synchronously driven to rotate on the frame 1 by rotating the transmission rod 643. At the same time, the rotating rod 641 can be automatically fixed in the rotating position by the self-locking function of the worm wheel 66 and the worm 65, so that the ratchet 622 can be kept in a state of being disengaged from the second ratchet 621.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-tonnage supporting and connecting device, characterized in that: include: Frame (1); A connecting arm (2) mounted on the vehicle frame (1); A support frame (3) having one end hingedly arranged on the connecting arm (2), wherein the axial length direction of the hinge axis of the support frame (3) on the connecting arm (2) is defined as a first direction; A support seat (4) is mounted on the vehicle frame (1), and when the support frame (3) is rotated to a vertical state, it can rest against the support seat (4); A rotating sleeve (31) is rotatably arranged on the support frame (3), and the axis of the rotating sleeve (31) is arranged along a first direction; A cross bar (21) is fixedly mounted on the connecting arm (2), and the length direction of the cross bar (21) is arranged along a first direction; There are two movable sleeves (211), both of which are rotatably arranged on the crossbar (21), and the positions of the two movable sleeves (211) on the crossbar (21) have a degree of freedom to be adjusted along a first direction; There are two support rods (22), one end of each of the two support rods (22) is hingedly arranged on the two movable sleeves (211), and the other end of each of the two support rods (22) is hingedly arranged on the rotating sleeves (31).

2. The large-tonnage supporting and connecting device according to claim 1, characterized in that: The frame (1) is also provided with a driving unit (5) for driving the moving sleeve (211) to move on the crossbar (21), and the driving unit (5) comprises: There are two moving blocks (51), and the positions of the two moving blocks (51) on the frame (1) have a degree of freedom that can be adjusted along a first direction; A driving rod (52) has one end hingedly arranged on the moving block (51), and the other end is fixedly provided with a hook for hanging on the outside of the moving sleeve (211), and the outside of the moving sleeve (211) is provided with an annular groove for accommodating the hook.

3. The large-tonnage supporting and connecting device according to claim 2, characterized in that: A screw rod (53) is rotatably arranged on the frame (1), one end of the screw rod (53) extends to the outside of the frame (1), and the two moving blocks (51) are both provided with threaded holes threadedly connected to the screw rod (53), and the threaded holes on the two moving blocks (51) have opposite rotation directions.

4. The large-tonnage supporting and connecting device according to claim 1, characterized in that: The support seat (4) is also provided with a limiting unit (6) for limiting the end of the support frame (3) away from the connecting arm (2) on the support seat (4).

5. The large-tonnage supporting and connecting device according to claim 4, characterized in that: The limiting unit (6) comprises: a first ratchet (61) rotatably disposed on the support seat (4), wherein teeth are disposed on the outer side of the first ratchet (61), and ends of the teeth can extend out of the top of the support seat (4) and abut against one side of the support frame (3) to limit the support frame (3) from turning in a direction close to the connecting arm (2); An anti-rotation assembly (62) is arranged between the first ratchet wheel (61) and the vehicle frame (1) and is used to limit the first ratchet wheel (61) from driving the teeth to rotate in a direction away from the support frame (3).

6. The large-tonnage supporting and connecting device according to claim 5, characterized in that: The anti-rotation component (62) comprises: A second ratchet wheel (621) is coaxially arranged with and fixedly connected to the first ratchet wheel (61); A ratchet pawl (622), one end of which is hingedly arranged on the vehicle frame (1), and the other end of which can abut against the outer side of the second ratchet wheel (621) to limit the rotation of the second ratchet wheel (621); A driving assembly (63) is installed between the vehicle frame (1) and the ratchet pawl (622) and is used to drive the ratchet pawl (622) to swing on the vehicle frame (1).

7. The large-tonnage supporting and connecting device according to claim 6, characterized in that: The driving assembly (63) comprises: A first connecting rod (631), one end of which is fixedly connected to the hinge shaft of the ratchet pawl (622) on the vehicle frame (1); A second connecting rod (632) is hingedly connected to an end of the first connecting rod (631) away from the ratchet pawl (622); A sliding block (633) is slidably arranged on the vehicle frame (1), and the other end of the second connecting rod (632) is hingedly arranged on the sliding block (633); An elastic member (634) is installed between the sliding block (633) and the vehicle frame (1) and is used to push the sliding block (633) to move in a direction close to the ratchet pawl (622); A pushing assembly (64) is arranged between the sliding block (633) and the vehicle frame (1) and is used to push the sliding block (633) to move in a direction away from the ratchet pawl (622).

8. The large-tonnage supporting and connecting device according to claim 7, characterized in that: The pushing assembly (64) comprises: A rotating rod (641) is rotatably arranged on the vehicle frame (1), and the length direction of the rotating rod (641) is arranged along the sliding arrangement of the sliding block (633); The pushing block (642) is threadedly connected to the rotating rod (641), and the pushing block (642) abuts against a side of the sliding block (633) close to the ratchet pawl (622).

9. The large-tonnage supporting and connecting device according to claim 8, characterized in that: A transmission rod (643) is also rotatably arranged on the frame (1), one end of the transmission rod (643) is located outside the frame (1), and the transmission rod (643) is transmission-connected to the rotating rod (641).

10. The large-tonnage supporting and connecting device according to claim 9, characterized in that: A worm (65) is fixedly mounted on the transmission rod (643), and the worm (65) is coaxially arranged with the transmission rod (643). A worm wheel (66) is fixedly mounted on the rotating rod (641), and the worm wheel (66) is coaxially arranged with the rotating rod (641) and is meshed with the worm (65).

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