Transfer device for composite food packaging film production

Abstract

The invention discloses a transfer device for composite food packaging film production. The transfer device comprises a driving vehicle, and a mounting shaft is arranged on the driving vehicle; a frame body; the hanging column is mounted on the frame body; the rotating part is rotationally mounted on the mounting shaft, a hanging groove is formed in the rotating part, the hanging groove is provided with a first inner wall and a second inner wall, and a height difference exists between the end of the first inner wall and the end of the second inner wall; the locking piece is mounted in the hanging groove; when the frame body moves towards the driving vehicle, the hanging column can enter the hanging groove to abut against the second inner wall, and the rotating piece is pushed to rotate towards the first direction. When the food packaging film is transported through the device, it is not needed to be carefully aligned with hooks on an AGV trolley and a frame body like in the prior art, the length of the whole hanging column can be designed to be large, and therefore only the frame body needs to be pushed in the direction of the driving vehicle, the hanging column and the rotating piece are in contact, and the rotating piece is pushed to rotate in the first direction; therefore, the connection between the frame body and the driving vehicle is completed.

Description

Technical Field

[0001] The invention relates to an AGV transfer device, in particular to a transfer device for producing composite food packaging films. Background Art

[0002] AGV, the full name of which is automatic guided vehicle, also known as AGV transfer vehicle, works by loading goods automatically or manually, driving automatically along a set route or pulling a cargo trolley to a designated location, and then loading and unloading goods automatically or manually.

[0003] In the existing technology, it is necessary to align the hooks on the AGV cart and the frame for connection. Therefore, during the manual connection process, the position of the frame needs to be constantly adjusted. When running some items that are easy to roll, such as rolled composite food packaging film, the continuous reciprocating movement of the frame will cause the rolled composite food packaging film above to roll and fall or be damaged by friction. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that alignment connection is required.

[0005] The above technical problems are solved by the following technical solutions: The present invention proposes a transfer device for producing composite food packaging film, comprising

[0006] A driving vehicle, wherein the driving vehicle is provided with a mounting shaft;

[0007] frame;

[0008] A hanging column, which is installed on the frame;

[0009] a rotating member rotatably mounted on the mounting shaft, wherein a hanging groove is formed on the rotating member, wherein the hanging groove has a first inner wall and a second inner wall, and an end portion of the first inner wall and an end portion of the second inner wall have a height difference;

[0010] A locking member installed inside the hanging slot;

[0011] When the frame moves toward the driving vehicle, the hanging column can enter the hanging groove and contact the second inner wall, pushing the rotating member to rotate in the first direction;

[0012] A locking slot is provided on the mounting shaft. When the hanging column is located inside the hanging slot, it can push the locking member into the locking slot to prevent the rotating member from rotating in a second direction. The first direction is opposite to the second direction.

[0013] In a preferred embodiment of the transfer device for producing composite food packaging film of the present invention, a notch is provided on the rotating member, and the hanging column enters the hanging groove through the notch.

[0014] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: The hanging column is slidably installed on the driving vehicle, and a positioning member is arranged on the driving vehicle for locking the hanging column.

[0015] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: A slide rail is installed on the frame body, the hanging column is connected with a column frame, and the column frame is slidably installed on the slide rail.

[0016] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: Positioning holes are formed in the slide rail, corresponding holes are formed in the column frame, and when the positioning member is inserted into the positioning hole and the corresponding hole at the same time, the column frame can be locked.

[0017] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: The locking member includes a lock column slidably installed on the rotating member, and a first elastic member abutted against the lock column; the first elastic member applies a thrust force to the lock column in a direction away from the lock groove.

[0018] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: The locking member further includes a convex portion arranged outside the lock column, a lock tongue slidably installed on the lock column, and a second elastic member arranged between the convex portion and the lock tongue.

[0019] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: It further includes a concentric member installed on the driving vehicle, a buffer member installed on the concentric member, a pressing body installed on the rotating member, and the pressing body is in contact with the buffer member; when the rotating member rotates in the first direction, the pressing body can press the buffer member.

[0020] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: The buffer member includes an arc column installed on the concentric member, and a third elastic member sleeved outside the arc column; the arc column penetrates through the pressing body.

[0021] In a preferred embodiment of the transfer device for producing the composite food packaging film of the present invention: A rear hook is installed on the driving vehicle, and the concentric member and the mounting shaft are both installed on the rear hook.

[0022] The beneficial effect of the present invention is that when transporting the food packaging film through this device, there is no need to carefully align the AGV cart and the hook on the frame body as in the prior art. Only need to push the frame body towards the driving vehicle, the hanging column and the rotating member come into contact and push the rotating member to rotate in the first direction, then the connection between the frame body and the driving vehicle can be completed. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0024] Figure 1 Shows the overall structural schematic diagram of the transfer device for the production of composite food packaging films;

[0025] Figure 2 Shows the structural schematic diagram of the frame and the driving vehicle;

[0026] Figure 3 Shows the structural schematic diagram of the hanging column and the rotating member;

[0027] Figure 4 Shows the schematic diagram of the installation position of the rotating member;

[0028] Figure 5 Shows the structural schematic diagram of the rear hanging;

[0029] Figure 6 Shows the specific structural schematic diagram of the rotating member;

[0030] Figure 7 Shows Figure 6 The enlarged view at position A in;

[0031] Figure 8 Shows the first state diagram of the rotating member;

[0032] Figure 9 Shows the second state diagram of the rotating member;

[0033] Figure 10 Shows the third state diagram of the rotating member;

[0034] Figure 11 Shows the structural schematic diagram of the synchronizing member;

[0035] Figure 12 Shows the exploded view of the structures of the synchronizing member and the rotating member;

[0036] Figure 13 Shows the structural schematic diagram of the column frame and the slide rail.

[0037] 100. Driving vehicle; 101. Mounting shaft; 102. Lock groove; 103. Rear hook; 200. Frame body; 201. Positioning member; 202. Slide rail; 203. Positioning hole; 300. Hanging post; 301. Post frame; 302. Corresponding hole; 400. Rotating member; 401. Hanging groove; 402. First inner wall; 403. Second inner wall; 404. Notch; 405. Pressing body; 406. Support platform; 402a. First top end; 403a. Second top end; 500. Locking member; 501. Lock post; 502. First elastic member; 503. Protrusion; 504. Lock tongue; 505. Second elastic member; 600. Concentric member; 601. Concentric groove; 700. Buffer member; 701. Arc post; 702. Third elastic member. Detailed implementation manners

[0038] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings.

[0039] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0040] Referring to Figures 1 to 7 , this embodiment provides a transfer device for producing a composite food packaging film, including a driving vehicle 100, on which a mounting shaft 101 is provided; the driving vehicle 100 is an AGV cart for transporting goods in a factory and can travel on a set track.

[0041] This transfer device further includes a frame body 200, on which goods are loaded. In this embodiment, it is mainly used to load food packaging films. In actual use, a limiting structure can also be installed on the frame body 200, and the rolled food packaging films are placed on the limiting structure to avoid the problem that the rolled food packaging films roll on the frame body 200. To facilitate the AGV cart to pull the frame body 200 and also to facilitate the connection between the frame body 200 and the AGV cart, rollers are installed on the frame body 200.

[0042] This transfer device further includes a hanging post 300, which is installed on the frame body 200 and is mainly used for hanging connection with the driving vehicle 100.

[0043] The transfer device further includes a rotating member 400 which is rotatably mounted on the mounting shaft 101. A hanging groove 401 is formed on the rotating member 400, and the hanging post 300 is hooked inside the hanging groove 401, so as to achieve the effect of connecting the driving vehicle 100 and the frame body 200. The hanging groove 401 has a first inner wall 402 and a second inner wall 403, and there is a height difference between the end of the first inner wall 402 and the end of the second inner wall 403; as Figure 6 , an embodiment of the first inner wall 402 and the second inner wall 403 is shown. In this embodiment, the top end of the first inner wall 402 is marked as the first top end 402a, and the top end of the second inner wall 403 is marked as the second top end 403a. The height of the first top end 402a is lower than that of the second top end 403a. Therefore, when the frame body 200 moves towards the driving vehicle 100, the frame body 200 drives the hanging post 300 to move towards the rotating member 400. The height of the hanging post 300 is higher than that of the first top end 402a and lower than that of the second top end 403a. Therefore, the hanging post 300 can pass through the first inner wall 402, and the hanging post 300 enters the inside of the hanging groove 401 and abuts against the second inner wall 403. As the frame body 200 continues to move, the hanging post 300 can push the rotating member 400 to rotate in the first direction, as Figure 6 . The clockwise direction on the paper surface is the first direction.

[0044] During this process, the moving mode of the hanging post 300 is translation, so its height remains unchanged. However, the moving mode of the rotating member 400 is rotation, so the heights of the first top end 402a and the second top end 403a change, as Figures 8 to 10 shown, which briefly shows how the hanging post 300 is hooked inside the hanging groove 401. Figure 8 shows the initial position of the rotating member 400. At this time, the hanging groove 401 is inclined towards the hanging post 300. The height of the hanging post 300 is higher than that of the first top end 402a and lower than that of the second top end 403a. Push the frame body 200 to move towards the driving vehicle 100. At this time, the hanging post 300 can abut against the second inner wall 403.

[0045] As Figure 9 shown, when the hanging post 300 continues to move, it can push the rotating member 400 to rotate in the first direction through the second inner wall 403. As the rotating member 400 rotates, the heights of the first top end 402a and the second top end 403a increase, but the height of the hanging post 300 remains unchanged. When the heights of both the first top end 402a and the second top end 403a are higher than the height of the hanging post 300, the hanging post 300 is hooked inside the hanging groove 401.

[0046] The transfer device also includes a locking member 500, which is installed inside the hanging groove 401; a locking groove 102 is provided on the mounting shaft 101, and when the hanging column 300 is located inside the hanging groove 401, it can push the locking member 500 into the locking groove 102, preventing the rotating member 400 from rotating in the second direction, which is opposite to the first direction and the second direction.

[0047] The mounting shaft 101 is fixed to the driving vehicle 100. When the end of the locking member 500 enters the interior of the locking groove 102, the locking member 500 can prevent the rotating member 400 from rotating in the second direction. Figure 6 The counterclockwise direction in the middle of the paper is the second direction. Since the position of the rotating member 400 is locked and cannot move in the second direction, the hanging post 300 cannot push the rotating member 400 in the second direction, and the hanging post 300 cannot escape from the hanging slot 401.

[0048] Through the solution in this embodiment, when transporting food packaging film through this device, there is no need to carefully align the hooks on the AGV cart and the frame 200 as in the prior art. The length of the entire hanging column 300 can be designed to be longer, so that it is only necessary to push the frame 200 toward the driving vehicle 100, and the hanging column 300 and the rotating part 400 form contact and push the rotating part 400 to rotate in the first direction to complete the connection between the frame 200 and the driving vehicle 100, thereby solving the problem of inconvenient connection between the AGV cart and the frame 200 in the prior art.

[0049] As an optional embodiment, a notch 404 is provided on the rotating member 400, and the hanging column 300 enters the hanging groove 401 through the notch 404. By providing the notch 404 on the rotating member 400, the height difference between the first top 402a of the first inner wall 402 and the second top 403a of the second inner wall 403 can be further increased, thereby making it easier to make the height of the hanging column 300 higher than the first top 402a and the first and second tops 403a. Because the height difference between the first top 402a of the first inner wall 402 and the second top 403a of the second inner wall 403 is increased, a hanging column 300 with a larger diameter can be used, thereby improving the stability of the connection between the frame 200 and the driving vehicle 100.

[0050] As an optional embodiment, the hanging post 300 is slidably installed on the driving cart 100, and a positioning piece 201 is provided on the driving cart 100 for locking the hanging post 300. During the connection and the driving cart 100 pulling the frame 200, the positioning piece 201 locks the hanging post 300, so that the height of the hanging post 300 is fixed, preventing the hanging post 300 from moving upward and detaching. When the goods arrive at the destination and the frame 200 needs to be separated from the driving cart 100, it is only necessary to release the lock of the hanging post 300 by the positioning piece 201 and pull the hanging post 300 upward to allow the hanging post 300 to detach from the inside of the hanging groove 401, thereby releasing the connection between the frame 200 and the driving cart 100.

[0051] Specifically, a slide rail 202 is installed on the frame 200, and the hanging column 300 is connected to the column frame 301. The column frame 301 is slidably installed on the slide rail 202. The slide rail 202 has a slide groove. A slider is fixed on the column frame 301. The slider can be slidably installed inside the slide groove belt, so that the column frame 301 can move along the slide rail 202.

[0052] There are two slide rails 202, and the column frame 301 and the two slide rails 202 are all slidably connected, and the slide rails 202 are arranged vertically. In this way, when the column frame 301 moves on the slide rail 202, it can move up and down. The hanging column 300 is fixed on the column frame 301, and the up and down movement of the column frame 301 can change the height of the hanging column 300. When the hanging column 300 needs to be removed from the inside of the hanging groove 401, it is only necessary to release the lock of the positioning part 201 on the column frame 301 and move the column frame 301 upward to remove the hanging column 300 from the inside of the hanging groove 401.

[0053] A positioning hole 203 is provided on the slide rail 202, and a corresponding hole 302 is provided on the column frame 301. The positioning member 201 is inserted into the positioning hole 203 and the corresponding hole 302 at the same time to lock the column frame 301. When the position of the positioning hole 203 and the position of the corresponding hole 302 coincide with each other, the positioning member 201 is inserted into the inside of the positioning hole 203 and the corresponding hole 302 to lock the column frame 301 on the slide rail 202. When the column frame 301 needs to be unlocked, it is only necessary to pull the positioning member 201 out from the inside of the positioning hole 203 and the corresponding hole 302.

[0054] The locking member 500 includes a locking post 501 slidably mounted on the rotating member 400 , and a first elastic member 502 abutting against the locking post 501 ; the first elastic member 502 applies a thrust to the locking post 501 in a direction away from the locking slot 102 .

[0055] like Figure 7 , showing the specific structure of the lock column 501. From the figure, we can see that because the lock groove 102 is located on the radial side wall of the installation shaft 101, and the lock groove 102 and the installation shaft 101 are concentric circles, the bottom of the lock groove 102 is recessed relative to the radial side wall of the installation shaft 101. When the lock column 501 is in a normal state, due to the thrust of the first elastic member 502, there is a gap between the end of the lock column 501 and the radial side wall of the installation shaft 101.

[0056] The rotating member 400 is provided with a support platform 406 inside the hanging groove 401 , and the locking column 501 passes through the support platform 406 . The end of the locking column 501 away from the installation shaft 101 contacts the first elastic member 502 , and the other end of the first elastic member 502 contacts the support platform 406 .

[0057] When the hanging post 300 engages with the hanging slot 401 and rotates the rotating member 400 by pushing it with the second inner wall 403, the translation height of the hanging post 300 remains unchanged at this time. However, the locking post 501 rotates with the rotating member 400, and the height of the end portion thereof away from the mounting shaft 101 increases, coming into contact with the hanging post 300, causing the locking post 501 to move in the direction of the mounting shaft 101. When the hanging slot 401 reaches the vertical state, the end portion of the locking member 500 enters the inside of the locking slot 102.

[0058] In another embodiment, the locking member 500 further includes a protrusion 503 disposed outside the locking post 501, a locking tongue 504 slidably mounted on the locking post 501, and a second elastic member 505 disposed between the protrusion 503 and the locking tongue 504. The purpose of this setting is to lock the rotating member 400 more stably. The locking tongue 504 is slidably mounted on the end portion of the locking post 501 close to the mounting shaft 101 through a chute and slider structure. When the hanging post 300 pushes the rotating member 400 to rotate in the first direction, the hanging post 300 will contact the end portion of the locking post 501 away from the mounting shaft 101. As the hanging post 300 continues to push, the locking post 501 is resisted by the hanging post 300 and moves in the direction of the mounting shaft 101. Before the hanging slot 401 reaches the vertical state, the movement of the locking post 501 will push the locking tongue 504 to contact the radial side wall of the mounting shaft 101. However, due to the limitation of the radial side wall of the mounting shaft 101, the reaction force received by the locking tongue 504 presses the second elastic member 505, causing the second elastic member 505 to deform. When the hanging slot 401 reaches the vertical state, the position of the locking tongue 504 corresponds to the position of the locking slot 102 at this time. Under the action of the second elastic member 505, the locking tongue 504 ejects into the inside of the locking slot 102, making the depth of the locking tongue 504 extending into the locking slot 102 deeper, thereby improving the stability of locking the rotating member 400.

[0059] Among them, both the first elastic member 502 and the second elastic member 505 can adopt a spring structure.

[0060] In another embodiment, the transfer device further includes a concentric member 600 mounted on the driving vehicle 100, a buffer member 700 mounted on the concentric member 600, and a pressing body 405 mounted on the rotating member 400. The pressing body 405 is in contact with the buffer member 700; when the rotating member 400 rotates in the first direction, the pressing body 405 can press the buffer member 700.

[0061] The purpose of setting the buffer member 700 is to prevent the frame 200 from instantly stopping when the driving vehicle 100, i.e., the AGV cart, stops moving, which may cause the composite food packaging film to roll down or cause damage due to friction between the composite food packaging film and the frame 200. Therefore, the buffer member 700 is provided. When the driving vehicle 100, i.e., the AGV cart, stops moving, the frame 200 can continue to move forward for a certain distance and the speed of the frame 200 is gradually reduced through the buffer member 700 to avoid too fast braking speed.

[0062] The concentric member 600 is fixed to the driving vehicle 100. A rear hook 103 is installed on the driving vehicle 100. The concentric member 600 and the mounting shaft 101 are both installed on the rear hook 103. There are two concentric members 600 installed on the rear hook 103. The mounting shaft 101 is installed between the two concentric members 600. A concentric groove 601 is formed on the concentric member 600. The concentric groove 601 and the mounting shaft 101 are concentric. The pressing body 405 extends into the interior of the concentric groove 601. When the rotating member 400 rotates outside the mounting shaft 101, the pressing body 405 moves along the concentric groove 601.

[0063] The buffer member 700 includes an arc column 701 installed on the concentric member 600 and a third elastic member 702 sleeved outside the arc column 701; the arc column 701 penetrates through the pressing body 405.

[0064] Therefore, in this embodiment, after the hanging groove 401 is in the vertical state, the entire rotating member 400 can still rotate in the first direction. When the rotating member 400 rotates in the first direction, the pressing body 405 presses the third elastic member 702.

[0065] Its working principle is as follows:

[0066] When the hanging post 300 enters the interior of the hanging groove 401 and the hanging groove 401 reaches the vertical state due to the rotation of the rotating member 400, the locking tongue 504 ejects into the interior of the locking groove 102 to prevent the rotating body from rotating in the second direction. At this time, when the driving vehicle 100, i.e., the AGV cart, moves, the rotating member 400 pulls the frame 200 to move by pulling the hanging post 300. At this time, the hanging post 300 exerts a reaction force on the first inner wall 402. However, due to the limitation of the locking tongue 504, the rotating member 400 cannot rotate in the second direction. Therefore, the rotating member 400 can stably pull the frame 200 through the hanging post 300.

[0067] When the driving vehicle 100, that is, the AGV trolley, stops moving, the frame 200 continues to move forward a short distance due to inertia. At this time, the hanging column 300 continues to move forward to push the second inner wall 403, thereby pushing the rotating part 400 to rotate in the first direction. At this time, the rotating part 400 drives the pressing body 405 to rotate in the first direction, pressing the third elastic part 702. The third elastic part 702 deforms and applies a reaction force to the pressing body 405. This reaction force is transmitted to the frame 200 through the rotating part 400 and the hanging column 300, causing the frame 200 to slow down until it stops, avoiding the problem that the driving vehicle 100, that is, the AGV trolley, stops moving, and the frame 200 also stops moving instantly, causing the composite food packaging film to roll off, or the composite food packaging film and the frame 200 to be damaged by friction.

[0068] In addition, by the pressing body 405 being inside the concentric groove 601 and in contact with the third elastic member 702, the third elastic member 702 can apply pressure to the pressing body 405 so that the pressing body 405 and the rotating member 400 maintain their initial positions without external force.

[0069] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A transfer device for the production of a composite food packaging film, characterized in that: including a driving vehicle (100) provided with a mounting shaft (101) thereon; a frame body (200); a hanging post (300) mounted on the frame body (200); a rotating member (400) rotatably mounted on the mounting shaft (101), a hanging groove (401) being formed in the rotating member (400), the hanging groove (401) having a first inner wall (402) and a second inner wall (403), and there being a height difference between the end of the first inner wall (402) and the end of the second inner wall (403); a locking member (500) mounted inside the hanging groove (401); when the frame body (200) moves towards the driving vehicle (100), the hanging post (300) can enter the inside of the hanging groove (401) and abut against the second inner wall (403), pushing the rotating member (400) to rotate in a first direction; a locking groove (102) is formed in the mounting shaft (101), and when the hanging post (300) is located inside the hanging groove (401), it can push the locking member (500) to insert into the locking groove (102) to prevent the rotating member (400) from rotating in a second direction, the first direction and the second direction being opposite; 2. The transfer device for producing a composite food packaging film according to claim 1, wherein: a notch (404) is formed in the rotating member (400), and the hanging post (300) enters the hanging groove (401) through the notch (404); 3. The transfer device for producing a composite food packaging film according to claim 1, characterized in that: the hanging post (300) is slidably mounted on the driving vehicle (100), and a positioning member (201) is provided on the driving vehicle (100) for locking the hanging post (300); 4. The transfer device for producing a composite food packaging film according to claim 3, wherein: a slide rail (202) is mounted on the frame body (200), the hanging post (300) is connected with a post frame (301), and the post frame (301) is slidably mounted on the slide rail (202); 5. The transfer device for producing a composite food packaging film according to claim 4, characterized in that: a positioning hole (203) is formed in the slide rail (202), a corresponding hole (302) is formed in the post frame (301), and when the positioning member (201) is inserted into the positioning hole (203) and the corresponding hole (302) simultaneously, the post frame (301) can be locked; 6. The transfer device for producing a composite food packaging film according to claim 1, characterized in that: the locking member (500) includes a locking post (501) slidably mounted on the rotating member (400), and a first elastic member (502) abutted against the locking post (501); the first elastic member (502) applies a thrust to the locking post (501) in a direction away from the locking groove (102); 7. The transfer device for producing the composite food packaging film according to claim 6, wherein: the locking member (500) further includes a convex portion (503) provided outside the locking post (501), a locking tongue (504) slidably mounted on the locking post (501), and a second elastic member (505) provided between the convex portion (503) and the locking tongue (504); 8. The transfer device for producing a composite food packaging film according to any one of claims 1 to 7, characterized in that: also included are a concentric member (600) mounted on the driving vehicle (100), a buffer member (700) mounted on the concentric member (600), a pressing body (405) mounted on the rotating member (400), and the pressing body (405) is in contact with the buffer member (700); when the rotating member (400) rotates in the first direction, the pressing body (405) can press the buffer member (700).

9. The transfer device for producing a composite food packaging film according to claim 8, characterized in that: The buffer member (700) includes an arc column (701) mounted on the concentric member (600), and a third elastic member (702) sleeved outside the arc column (701); The arc column (701) penetrates through the pressing body (405).

10. The transfer device for producing the composite food packaging film according to claim 9, characterized in that: A rear hook (103) is mounted on the driving vehicle (100), and the concentric member (600) and the mounting shaft (101) are both mounted on the rear hook (103).

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