Quick road surface connecting hook

Abstract

The invention provides a quick road surface connecting hook, and relates to the field of beach road surfaces. The road surface quick connecting hook comprises a double-pin assembly, a butt joint bearing assembly, a connecting belt and a hook assembly. The front end of the butt joint bearing assembly and the front end of the double-pin assembly are in butt joint and fixed through bolts. The front ends of the double-pin assembly and the butt-joint bearing assembly are directly stressed, the stress of bolts at the front ends of the double-pin assembly and the butt-joint bearing assembly is small, the stress of the connecting belt is reduced through mutual insertion of the double-pin assembly and the butt-joint bearing assembly, the stress of the bolts at the rear ends of the double-pin assembly and the butt-joint bearing assembly is reduced, and damage to the bolts at the front end and the rear end of the butt-joint bearing assembly is reduced. And the situation that the pavement quick connecting hook fails due to bolt damage is reduced. The dovetail structure at the tail end of the double-pin assembly limits rotation of the end of the connecting belt on the double-pin assembly, and therefore abrasion of the double-pin assembly to the connecting belt is reduced. The hook assembly is hung on the shoal pavement, a pin shaft does not need to be disassembled firstly, and rapid deployment of the shoal pavement is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of beach pavement, and in particular to a pavement quick-connect hook. Background Art

[0002] The poor bearing capacity of the tidal flat makes it inconvenient for vehicles to travel. The shore and beach pavement is used to construct a passage on the foundation of the tidal flat, so that vehicles can travel on the laid pavement slabs to ensure the rapid passage of vehicles. The pavement working device adopts an integral lifting drum, and the shore and beach pavement is wound on the drum to retract and release the road panel.

[0003] In the related art, a road quick-connect hook is used to connect the drum of a road working device and the end of a shore road surface. At present, the connection between the drum and the end of the shore road surface adopts a connecting belt and a pin shaft to connect to the end of the shore road surface. First, when the connection between the connecting belt and the pin shaft is dismantled, it is necessary to remove the pin shaft first and then remove the connecting belt. The disassembly time is relatively long. When the shore road surface needs to be quickly unfolded, the required time will also be relatively extended. Second, when connected by the connecting belt and the pin shaft, the connecting belt and the pin shaft will rotate with each other to generate friction, which may easily cause damage to the connecting belt. Third, when connected to the end of the shore road surface by the pin shaft, the force area on the pin shaft is small, which may easily cause the pin shaft to bend and deform, making it inconvenient to replace. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a road surface quick connection hook, which has the effect of reducing the stress on the connecting bolt, improving the service life of the connecting hook after assembly, adopting the large end stress of the connecting belt stress dovetail structure, effectively reducing the pressure on the connecting belt and the double pin assembly, and adopting a dovetail structure at the connection between the connecting belt and the double pin assembly to reduce the wear between the two, and also has the effect of quickly connecting with the shore road surface.

[0005] The road quick-connect hook according to the embodiment of the present application includes: a double-pin assembly, a docking bearing assembly, a connecting belt and a hook assembly.

[0006] The front end of the docking load-bearing component and the front end of the double-pin component are fixed to each other by bolts, and the rear end of the docking load-bearing component is inserted into the double-pin component and fixed by bolts. The tail end of the double-pin component is a dovetail structure, and the connecting belt is sleeved on the dovetail structure at the tail end of the double-pin component. The hook component is rotatably sleeved on the double-pin component and the front end of the docking load-bearing component.

[0007] According to some embodiments of the present application, the double-pin assembly includes a first connecting plate, a front pin, a rear pin and a folding tail dove, one side of the front pin and the rear pin are respectively fixedly inserted into the interior of the front end and the rear end of the first connecting plate, the front end of the docking load-bearing assembly and the front pin are docked and fixed to each other by bolts, the hook assembly is rotatably sleeved on the front pin and the front end of the docking load-bearing assembly, the front end of the folding tail dove is fixed to the rear pin, the side wall of the folding tail dove is fixedly connected to the first connecting plate, the connecting belt is sleeved on the rear pin and the folding tail dove, and the rear end of the docking load-bearing assembly is inserted into the interior of the rear pin and docked and fixed by bolts.

[0008] According to some embodiments of the present application, the rear pin includes a rear pin body, a positioning groove is formed inside the rear pin body at one end away from the first connecting plate, and the rear end of the docking bearing assembly is inserted into the positioning groove.

[0009] According to some embodiments of the present application, the docking bearing assembly includes a second connecting plate, a front docking tube and a rear docking tube, one side of the front docking tube and the rear docking tube are respectively fixedly inserted into the interior of the front end and the rear end of the second connecting plate, the front pin and the front docking tube are docked with each other, the bolt passes through the front docking tube and is connected to the interior of the front pin by threads, the rear docking tube is inserted into the interior of the rear pin, the bolt passes through the rear docking tube and is connected to the interior of the rear pin by threads.

[0010] According to some embodiments of the present application, the folding dovetail includes a folding dovetail plate and a side connecting reinforcement plate, the dovetail opening of the folding dovetail plate is fixedly connected to the rear side of the rear pin, the side wall of one side of the folding dovetail plate is fixedly connected to the first connecting plate, and the side connecting reinforcement plate is fixedly connected to the inside of the other side of the folding dovetail plate.

[0011] According to some embodiments of the present application, the connecting belt includes a belt body, one end of the belt body is folded and sewn to form a connecting hole, and the connecting hole of the belt body is sleeved on the rear pin and the folding tail swallow.

[0012] According to some embodiments of the present application, the hook assembly includes a connecting tube, a hook, a reinforcement plate and a reinforcement pad. The hook is provided in two, and the two hooks are fixedly connected to the outer walls at both ends of the connecting tube. The reinforcement plate is provided between the two hooks and the outer wall of the connecting tube. The reinforcement pad is fixedly connected to the two ends of the connecting tube. After the front end of the docking bearing assembly and the front pin pass through the two reinforcement pads respectively, the front end of the docking bearing assembly and the front pin are rotatably plugged into the two ends of the connecting tube.

[0013] The beneficial effects of the present application are as follows: when assembling the pavement quick connection hook, the connection belt is sleeved on the dovetail structure at the rear end of the double-pin assembly, the hook assembly is sleeved on the front end of the double-pin assembly, and then the rear end of the docking bearing assembly is inserted into the rear end of the double-pin assembly, and the front ends of the docking bearing assembly and the double-pin assembly are inserted into the hook assembly for docking, and two bolts are respectively passed through the front end and rear end of the docking bearing assembly, and then the bolts are connected and fixed at the front end and rear end of the double-pin assembly by threaded connection. First, when the hook assembly is subjected to force, the front end of the double-pin assembly and the docking bearing assembly are directly subjected to force, and the bolts at the front end are subjected to less force, and the force of the connection belt is subjected to the mutual plug-in of the double-pin assembly and the docking bearing assembly. The force of the two is directly subjected to force through the plug-in position, which reduces the force of the bolts fixing the double-pin assembly and the rear end of the docking bearing assembly, reduces the damage of the bolts at the front end and rear end of the docking bearing assembly, and reduces the failure of the pavement quick connection hook due to bolt damage. Second, the dovetail structure of the double-pin assembly has a large front end and a small rear end, and the force point is the front end of the dovetail structure, which has a larger force area than the single pin shaft and is not easy to be damaged. Third, the dovetail structure at the end of the double-pin assembly limits the rotation of the end of the connecting belt on the double-pin assembly, thereby reducing the wear of the double-pin assembly on the connecting belt. Fourth, the hook assembly is hung on the shore road surface without removing the pin shaft first, and the disassembly time is short, which is convenient for rapid deployment on the shore road surface.

[0014] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of a road surface quick connection hook according to an embodiment of the present application; Figure 2 is a schematic diagram of the three-dimensional structure of a double-pin assembly according to an embodiment of the present application; Figure 3 is a schematic diagram of the three-dimensional structure of a docking bearing assembly according to an embodiment of the present application; Figure 4 is a schematic diagram of the three-dimensional structure of a connecting belt according to an embodiment of the present application; Figure 5 It is a schematic diagram of the three-dimensional structure of the hook assembly according to an embodiment of the present application.

[0017] Icons: 100-double pin assembly; 110-first connecting plate; 120-front pin; 130-rear pin; 131-rear pin body; 132-positioning groove; 140-folding dovetail; 141-folding dovetail plate; 142-side connection reinforcement plate; 200-docking bearing assembly; 210-second connecting plate; 220-front docking tube; 230-rear docking tube; 300-connecting belt; 310-belt body; 320-connecting hole; 400-hook assembly; 410-connecting tube; 420-hook; 430-reinforcement plate; 440-reinforcement pad. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0019] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The following describes a road surface quick-connect hook according to an embodiment of the present application with reference to the accompanying drawings.

[0021] See also Figures 1 to 5 According to the embodiment of the present application, the road quick connecting hook includes: a double pin assembly 100, a docking bearing assembly 200, a connecting belt 300 and a hook assembly 400.

[0022] See also Figure 1The front end of the docking bearing assembly 200 and the front end of the double pin assembly 100 are docked and fixed with each other by bolts, and the rear end of the docking bearing assembly 200 is inserted into the double pin assembly 100 and docked and fixed by bolts. The rear end of the double pin assembly 100 is a dovetail structure, and the connecting belt 300 is sleeved on the dovetail structure at the rear end of the double pin assembly 100. The hook assembly 400 is rotatably sleeved on the double pin assembly 100 and the front end of the docking bearing assembly 200. When assembling the pavement quick connection hook, the connecting belt 300 is sleeved on the dovetail structure at the rear end of the double pin assembly 100, and the hook assembly 400 is sleeved on the front end of the double pin assembly 100. Thereafter, the rear end of the docking bearing assembly 200 is inserted into the rear end of the double pin assembly 100, and the front ends of the docking bearing assembly 200 and the double pin assembly 100 are inserted into the hook assembly 400 for docking. Two bolts are respectively passed through the front end and the rear end of the docking bearing assembly 200, and then the bolts are threadedly connected to the front end and the rear end of the double pin assembly 100 for connection and fixing. First, when the hook assembly 400 is subjected to force, the front ends of the double-pin assembly 100 and the docking bearing assembly 200 are directly subjected to force, and the bolts at the front end are subjected to less force. The force of the connecting belt 300 is applied through the mutual plugging of the double-pin assembly 100 and the docking bearing assembly 200. The force of the two is directly applied through the plugging position, which reduces the force on the bolts fixing the double-pin assembly 100 and the rear end of the docking bearing assembly 200, reduces the damage to the bolts at the front and rear ends of the docking bearing assembly 200, and reduces the failure of the road surface quick connection hook due to bolt damage. Second, the dovetail structure of the double-pin assembly 100 has a large front end and a small rear end, and the force point is the front end of the dovetail structure. Compared with the single pin shaft, the force area is larger and not easy to be damaged. Third, the dovetail structure at the rear end of the double-pin assembly 100 limits the rotation of the end of the connecting belt 300 on the double-pin assembly 100, thereby reducing the wear of the double-pin assembly 100 on the connecting belt 300. Fourthly, the hook assembly 400 is used to hang on the beach road surface, and there is no need to remove the pin shaft first, so the disassembly time is short, which is convenient for rapid deployment on the beach road surface.

[0023] See also Figure 1 to Figure 2The double-pin assembly 100 includes a first connecting plate 110, a front pin 120, a rear pin 130 and a folding tail swallow 140. One side of the front pin 120 and the rear pin 130 are respectively fixedly inserted into the front end and rear end of the first connecting plate 110. The front end of the docking bearing assembly 200 and the front pin 120 are docked and fixed to each other by bolts. The hook assembly 400 is rotatably sleeved on the front pin 120 and the front end of the docking bearing assembly 200. The front end of the folding tail swallow 140 is fixed to the rear pin 130. The side wall of the folding tail swallow 140 is fixedly connected to the first connecting plate 110. The connecting belt 300 is sleeved on the rear pin 130 and the folding tail swallow 140. The rear end of the docking bearing assembly 200 is inserted into the rear pin 130 and fixed by bolts. One side of the front pin 120 and the rear pin 130 is fixed by the first connecting plate 110, and the other side of the front pin 120 and the rear pin 130 are fixed by bolts through the docking bearing assembly 200. Specifically, the front end of the docking bearing assembly 200 and the front pin 120 are inserted into the hook assembly 400, and the bolt passes through the front end of the docking bearing assembly 200 and is connected to the front pin 120 by threads. The force of the hook assembly 400 is dispersed to the front end of the docking bearing assembly 200 and the front pin 120, so that the torque at the connection between the front end of the docking bearing assembly 200 and the front pin 120 is borne by the hook assembly 400, and the shear force on the bolt at the connection between the front end of the docking bearing assembly 200 and the front pin 120 is small, thereby reducing the damage of the bolt; the connecting belt 300 is sleeved on the rear pin 130 and On the folding tail swallow 140, the rear end of the docking bearing assembly 200 is inserted into the rear pin 130, and the bolt passes through the rear end of the docking bearing assembly 200 and is connected to the rear pin 130 through threads. The first connecting plate 110 and the docking bearing assembly 200 block both sides of the connecting belt 300, and the force of the connecting belt 300 is dispersed to the rear pin 130 at the front end of the folding tail swallow 140. The rear pin 130 has a larger diameter than the pin shaft directly connected to the shore road surface through the ear plate. The rear pin 130 and the folding tail swallow 140 limit the rotation of the connecting belt 300 to reduce wear. The torque formed by the tension of the rear pin 130 is borne by the connection between the rear end of the docking bearing assembly 200 and the rear pin 130. The shear force on the bolts at the connection between the rear end of the docking bearing assembly 200 and the rear pin 130 is small, thereby reducing the damage to the bolts.

[0024] See also Figure 1 to Figure 2 The rear pin 130 includes a rear pin body 131, and a positioning groove 132 is provided inside the rear pin body 131 at one end away from the first connecting plate 110, and the rear end of the docking bearing assembly 200 is inserted into the positioning groove 132. The rear end of the docking bearing assembly 200 is inserted into the positioning groove 132, and the torque formed by the tension of the rear pin 130 is borne by the limit of the docking bearing assembly 200 inserted into the positioning groove 132.

[0025] See also Figure 1 to Figure 2The folding dovetail plate 140 includes a folding dovetail plate 141 and a side connection reinforcement plate 142. The dovetail opening of the folding dovetail plate 141 is fixedly connected to the rear side of the rear pin 130. The side wall of one side of the folding dovetail plate 141 is fixedly connected to the first connection plate 110. The side connection reinforcement plate 142 is fixedly connected to the inside of the other side of the folding dovetail plate 141. The side connection reinforcement plate 142 strengthens the structure of the folding dovetail plate 141 and strengthens the strength of the connection between the folding dovetail plate 141 and the rear pin 130.

[0026] See also Figures 1 to 3 The docking bearing assembly 200 includes a second connecting plate 210, a front docking cylinder 220 and a rear docking cylinder 230. One side of the front docking cylinder 220 and the rear docking cylinder 230 are respectively fixedly inserted into the front end and the rear end of the second connecting plate 210. The front pin 120 and the front docking cylinder 220 are docked with each other. The bolt passes through the front docking cylinder 220 and is connected to the inside of the front pin 120 by threads. The rear docking cylinder 230 is inserted into the inside of the rear pin 130. The bolt passes through the rear docking cylinder 230 and is connected to the inside of the rear pin 130 by threads. The front pin 120 and the front docking sleeve 220 are both inserted into the hook assembly 400, and the torque generated by the deformation of the front pin 120 and the front docking sleeve 220 is borne by the hook assembly 400, and the front pin 120 and the front docking sleeve 220 are restricted by the hook assembly 400, and there is basically no misalignment between them, thereby reducing the force on the bolts at the connection between the front pin 120 and the front docking sleeve 220; the rear docking sleeve 230 is inserted into the rear pin 130, and the rear docking sleeve 230 and the rear pin 130 are restricted to each other with basically no misalignment, and the torque caused by the deformation is borne by the mutual insertion of the rear docking sleeve 230 and the rear pin 130, thereby reducing the force on the bolts at the connection between the rear pin 130 and the rear docking sleeve 230.

[0027] See also Figures 1 to 4 The connecting belt 300 includes a belt body 310 , one end of the belt body 310 is folded and sewn to form a connecting hole 320 , and the connecting hole 320 of the belt body 310 is sleeved on the rear pin 130 and the folding tail swallow 140 .

[0028] See also Figures 1 to 5The hook assembly 400 includes a connecting tube 410, a hook 420, a reinforcing plate 430 and a reinforcing pad 440. The hook 420 is provided in two pieces. The two hooks 420 are fixedly connected to the outer walls at both ends of the connecting tube 410. The reinforcing plate 430 is provided between the two hooks 420 and the outer wall of the connecting tube 410. The reinforcing pad 440 is fixedly connected to both ends of the connecting tube 410. After the front end of the docking bearing assembly 200 and the front pin 120 pass through the two reinforcing pads 440 respectively, the front end of the docking bearing assembly 200 and the front pin 120 are rotated and plugged into both ends of the connecting tube 410. The front pin 120 and the front docking tube 220 are inserted from both ends of the connecting tube 410 and then connected to each other by bolts. The two hooks 420 are reinforced by the reinforcing plate 430 to form a whole. The reinforcing pad 440 is used to strengthen the strength of both ends of the connecting tube 410 and reduce the deformation of both ends of the connecting tube 410. The hook 420 is directly hung on the shore road surface.

[0029] Specifically, the working principle of the road quick connection hook is as follows: when assembling the road quick connection hook, the belt body 310 forms a connection hole 320 which is sleeved on the rear pin 130 and the folding tail swallow 140, the front pin 120 and the front docking tube 220 are both inserted into the connection tube 410, and the rear docking tube 230 is inserted into the positioning groove 132 of the rear pin 130, and two bolts are used to pass through the front docking tube 220 and the rear docking tube 230 respectively, and then they are connected to the threaded holes of the front pin 120 and the rear pin 130 by bolts to achieve a fixed connection between the docking bearing assembly 200 and the double pin assembly 100, and the hook 420 is directly hung on the shore road surface without removing the pin shaft first, and the disassembly time is short, which is convenient for rapid deployment of the shore road surface. When the hook assembly 400 is subjected to force, the force of the hook assembly 400 is dispersed to the front pin 120 and the front docking tube 220. The torque generated by the deformation of the front pin 120 and the front docking tube 220 is borne by the hook assembly 400. The front pin 120 and the front docking tube 220 are restricted by the hook assembly 400 and are basically not misaligned with each other, which reduces the shear force on the bolts at the connection between the front pin 120 and the front docking tube 220. The first connecting plate 110 and the second connecting plate 210 block both sides of the connecting belt 300, and the force of the connecting belt 300 is dispersed to the rear pin 1 at the front end of the folding tail swallow 140. 30, the rear pin 130 has a larger diameter than the pin shaft directly connected to the shore road surface through the ear plate, and is not easy to be damaged. The rear pin 130 and the folding tail swallow 140 limit the rotation of the connecting belt 300, reducing the wear of the connecting belt 300, and the rear docking sleeve 230 and the rear pin 130 are basically not misaligned with each other, and the torque caused by the deformation is borne by the rear docking sleeve 230 and the rear pin 130 plugged in each other, and the bolts at the connection between the rear docking sleeve 230 and the rear pin 130 are subject to less shear force, reducing the damage of the bolts, thereby reducing the occurrence of failure of the road quick connection hook due to bolt damage.

[0030] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A road quick-connect hook, characterized in that: include: Double pin assembly (100); A docking bearing assembly (200), wherein the front end of the docking bearing assembly (200) and the front end of the double-pin assembly (100) are docked and fixed to each other by means of bolts, and the rear end of the docking bearing assembly (200) is inserted into the double-pin assembly (100) and then docked and fixed by means of bolts, and the rear end of the double-pin assembly (100) is a dovetail structure; A connecting belt (300), wherein the connecting belt (300) is sleeved on the dovetail structure at the rear end of the double-pin assembly (100); A hook assembly (400), the hook assembly (400) is rotatably sleeved on the double-pin assembly (100) and the front end of the docking bearing assembly (200).

2. The road quick-connect hook according to claim 1, characterized in that: The double pin assembly (100) comprises a first connecting plate (110), a front pin (120), a rear pin (130) and a folding tail dovetail (140), one side of the front pin (120) and the rear pin (130) are respectively fixedly inserted into the front end and the rear end of the first connecting plate (110), the front end of the docking bearing assembly (200) and the front pin (120) are docked and fixed to each other by bolts, the hook assembly (400) is rotatably sleeved on the front pin (120) and the front end of the docking bearing assembly (200), the front end of the folding tail dovetail (140) is fixed to the rear pin (130), the side wall of the folding tail dovetail (140) is fixedly connected to the first connecting plate (110), the connecting belt (300) is sleeved on the rear pin (130) and the folding tail dovetail (140), and the rear end of the docking bearing assembly (200) is inserted into the rear pin (130) and docked and fixed by bolts.

3. The road quick-connect hook according to claim 2, characterized in that: The rear pin (130) comprises a rear pin body (131), a positioning groove (132) is provided inside the rear pin body (131) at one end away from the first connecting plate (110), and the rear end of the docking bearing assembly (200) is inserted into the positioning groove (132).

4. The road quick-connect hook according to claim 3, characterized in that: The docking bearing assembly (200) comprises a second connecting plate (210), a front docking sleeve (220) and a rear docking sleeve (230); one side of the front docking sleeve (220) and the other side of the rear docking sleeve (230) are respectively fixedly plugged into the interior of the front end and the rear end of the second connecting plate (210); the front pin (120) and the front docking sleeve (220) are docked with each other; a bolt passes through the front docking sleeve (220) and is connected to the interior of the front pin (120) by means of a thread; the rear docking sleeve (230) is inserted into the interior of the rear pin (130); the bolt passes through the rear docking sleeve (230) and is connected to the interior of the rear pin (130) by means of a thread.

5. The road quick-connect hook according to claim 2, characterized in that: The folding dovetail (140) comprises a folding dovetail plate (141) and a side connection reinforcement plate (142), wherein the dovetail opening of the folding dovetail plate (141) is fixedly connected to the rear side of the rear pin (130), a side wall of one side of the folding dovetail plate (141) is fixedly connected to the first connection plate (110), and the side connection reinforcement plate (142) is fixedly connected to the inside of the other side of the folding dovetail plate (141).

6. The road quick-connect hook according to claim 2, characterized in that: The connecting belt (300) comprises a belt body (310), one end of the belt body (310) is folded and sewn to form a connecting hole (320), and the connecting hole (320) of the belt body (310) is sleeved on the rear pin (130) and the folding tail swallow (140).

7. The road quick-connect hook according to claim 2, characterized in that: The hook assembly (400) comprises a connecting tube (410), a hook (420), a reinforcing plate (430) and a reinforcing pad (440). The hook (420) is provided in two pieces, and the two hooks (420) are fixedly connected to the outer walls at both ends of the connecting tube (410). The reinforcing plate (430) is provided between the two hooks (420) and the outer wall of the connecting tube (410). The reinforcing pad (440) is fixedly connected to both ends of the connecting tube (410). After the front end of the docking bearing assembly (200) and the front pin (120) pass through the two reinforcing pads (440) respectively, the front end of the docking bearing assembly (200) and the front pin (120) are rotatably plugged into the two ends of the connecting tube (410).

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