Adjustable forklift pallet fork structure

Abstract

The utility model relates to the technical field of forklift forks, and discloses an adjustable forklift fork structure which comprises two fixing frames, lifting frames are connected to the front sides of the outer walls of the two fixing frames in a sliding mode, and a plurality of connecting plates are fixedly connected to the left sides and the right sides of the rear ends of the two fixing frames. The bottoms of the rear sides of the two fixing frames are fixedly connected with first pushing rods, the top ends of the two first pushing rods are fixedly connected with the rear sides of the tops of the two lifting frames, the bottoms of the front sides of the two lifting frames are fixedly connected with first connecting blocks, and the adjacent sides of the two first connecting blocks are rotationally connected with second pushing rods. According to the utility model, the fixed frame provides support, the push rod I transmits power to realize the vertical sliding of the lifting frame and adapt to different cargo heights, the connecting block I serves as a fulcrum, the push rod II and the connecting block II drive the cargo carrying frame to move back and forth to assist in accurately forking cargoes, and the buffer strip can buffer collision impact force.

Description

Technical Field

[0001] This utility model relates to the field of forklift fork technology, and in particular to an adjustable forklift fork structure. Background Technology

[0002] Forklifts are industrial handling vehicles, referring to various wheeled handling vehicles used for loading, unloading, stacking, and short-distance transportation of palletized goods. As a key loading and unloading equipment, the performance of the fork structure of a forklift directly affects its operational efficiency and safety, thus requiring an adjustable forklift fork structure.

[0003] Adjustable forklift forks consist of sliding fork tooth assemblies, coupled with specialized drive mechanisms, including hydraulic and electric screw drives, to achieve stepless or stepped adjustment of the fork tooth spacing. This allows them to adapt to pallet fork openings of different widths. While the initial design intent of adjustable forklift forks was to accommodate diverse cargo handling needs, adjusting fork spacing or length on inclined surfaces can shift the forklift's center of gravity, potentially causing it to tip over. Existing solutions involve placing automatically adjustable counterweights on the forklift chassis or at specific locations. When fork adjustment causes a shift in the center of gravity, sensors provide feedback, activating a hydraulic system to move the counterweights and return the forklift's center of gravity to a safe range. However, in actual operation, the forklift's center of gravity changes in complexity, making it difficult to perfectly match real-time changes. This results in the forklift's center of gravity remaining in a slightly unstable state during operation, which, over time, can potentially damage the forklift's structure and stability. Furthermore, it makes it difficult to ensure absolute forklift safety in complex working conditions. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an adjustable forklift fork structure, which aims to improve the problem that the changes in the center of gravity of the forklift in the prior art are complex and it is difficult to perfectly match the real-time changes in the center of gravity. Over the long term, this can cause potential damage to the structure and stability of the forklift, and it is difficult to ensure the absolute safety of the forklift when facing complex working conditions.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an adjustable forklift fork structure, comprising two fixed frames, with lifting frames slidably connected to the front sides of the outer walls of both fixed frames; multiple connecting plates fixedly connected to the left and right sides of the rear ends of both fixed frames; push rod one fixedly connected to the bottom rear side of both fixed frames; the top ends of the two push rods one fixedly connected to the rear top of the two lifting frames; connecting block one fixedly connected to the bottom front side of both lifting frames; push rod two rotatably connected to adjacent sides of the two connecting blocks one; and connecting block two rotatably connected to the front ends of the two push rods two. Each of the two lifting frames has a carrying rack fixedly connected to its front center. The outer walls of the two connecting blocks are fixedly connected to the rear outer walls of the carrying racks. Multiple buffer strips are fixedly connected to the front outer walls of the two carrying racks. Rotating frames are rotatably connected to the bottom of the front of the two carrying racks. Push rods are fixedly connected to the bottom of the two rotating frames. The rear ends of the two push rods are fixedly connected to the bottom of the two carrying racks. Adjustment components are provided on adjacent sides of the two lifting frames. Fixing mechanisms are provided on the left and right sides of the outer walls of the two lifting frames. The fixing mechanisms are used to prevent goods from collapsing when the road surface is tilted.

[0006] As a further description of the above technical solution:

[0007] The fixing mechanism includes two fixing plates. The front sides of the two fixing plates are respectively fixedly connected to the rear bottom of the rack. Sliding blocks are slidably connected to the left and right sides of the outer walls of the two fixing plates. Multiple fixing holes are opened on the outer walls of the two sliding blocks. Rotating blocks are fixedly connected to the left and right sides of the outer walls of the two racks. Baffles are rotatably connected to the adjacent sides of the two rotating blocks. Sliding grooves are opened on the opposite sides of the two baffles. The inner walls of the two sliding grooves are slidably connected to the outer walls of the two sliding blocks. Rotary valves are provided at the left and right ends of the outer walls of the two fixing plates. The two fixing holes are threaded to the left and right sides of the outer walls of the fixing plates through the rotary valves.

[0008] As a further description of the above technical solution:

[0009] The adjustment assembly includes multiple positioning bars, with the opposite sides of the multiple positioning bars fixedly connected to adjacent sides of the two lifting frames. Positioning sleeves are fixedly connected to adjacent sides of the middle of the two positioning bars, and guide bars are slidably connected to adjacent sides of the top of the two lifting frames.

[0010] As a further description of the above technical solution:

[0011] The front side of the outer wall of each of the two rotating frames is provided with a protective sleeve, and the rear side of each of the two protective sleeves is fixedly connected to the front side of the two rotating frames respectively.

[0012] As a further description of the above technical solution:

[0013] The outer rear side of each of the two racks is provided with a mounting groove, and the inner wall of each mounting groove is fixedly connected to the front side of each of the two connecting blocks.

[0014] As a further description of the above technical solution:

[0015] The two lifting frames each have a mounting groove 2 at their front bottom, and the inner walls of the two mounting grooves 2 are fixedly connected to the rear side of the outer wall of the connecting block 1.

[0016] As a further description of the above technical solution:

[0017] Connecting pieces are fixedly connected to the upper and lower sides of the outer walls of the two fixed plates, and the front sides of the two connecting pieces are threadedly connected to the rear bottom of the rack.

[0018] As a further description of the above technical solution:

[0019] The outer walls of both fixing plates are provided with protective sleeves, and the front ends of both protective sleeves are provided with mounting holes. The inner walls of the two mounting holes are respectively fixedly connected to the rear side of the fixing plates.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, a fixed frame provides support, and a push rod transmits power to realize the up and down sliding of the lifting frame, which can adapt to different cargo heights. A connecting block serves as a fulcrum, and the push rod and connecting block drive the rack to move back and forth, which helps to accurately pick up goods. The buffer strip can buffer the impact of collision and protect the goods and the rack. The rotating frame and push rod adjust the posture of the rack under special working conditions, maintain the stability of handling, and prevent the goods from slipping.

[0022] 2. In this utility model, the sliding block is fixed by a hole on its outer wall and a rotating valve at both ends of the fixed plate. After the rotating valve screw is screwed into the fixed hole, the position of the sliding block is locked by the friction of the thread. The baffles on both sides of the rack are connected by the rotating block and their grooves are slidably connected to the sliding block, thereby effectively limiting the goods and preventing them from slipping off the sides of the rack during transportation. This enhances the safety and adaptability of forklift transportation and improves the stability of goods handling operations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an adjustable forklift fork structure proposed in this utility model.

[0024] Figure 2This is a schematic diagram of the adjustment component for an adjustable forklift fork structure proposed in this utility model.

[0025] Figure 3 This is a partial structural diagram illustrating an adjustable forklift fork structure proposed in this utility model.

[0026] Figure 4 This is a partial structural exploded view of an adjustable forklift fork structure proposed in this utility model;

[0027] Figure 5 This is a schematic diagram of the fixing mechanism of an adjustable forklift fork structure proposed in this utility model.

[0028] Legend:

[0029] 1. Fixed frame; 2. Fixed mechanism; 201. Fixed plate; 202. Sliding block; 203. Fixed hole; 204. Rotating block; 205. Baffle; 206. Slide groove; 207. Rotary valve; 3. Lifting frame; 4. Connecting plate; 5. Push rod one; 6. Connecting block one; 7. Push rod two; 8. Connecting block two; 9. Loading rack; 10. Buffer strip; 11. Rotating frame; 12. Push rod three; 13. Positioning strip; 14. Positioning sleeve plate; 15. Guide strip; 16. Protective sleeve; 17. Mounting hole; 18. Protective sleeve; 19. Mounting groove one; 20. Mounting groove two; 21. Connecting piece. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 , Figure 4 and Figure 5This utility model provides an embodiment of an adjustable forklift fork structure, including two fixed frames 1. Lifting frames 3 are slidably connected to the front sides of the outer walls of both fixed frames 1. The lifting frames 3 can move up and down along the front sides of the outer walls of the fixed frames 1. Multiple connecting plates 4 are fixedly connected to the left and right rear sides of both fixed frames 1 to enhance the connection strength and stability between the fixed frames 1 and the forklift body. Push rods 5 are fixedly connected to the bottom rear sides of both fixed frames 1. The tops of the two push rods 5 are fixedly connected to the top rear sides of the two lifting frames 3. When the forklift's power system drives the push rods 5, the push rods 5 transmit force to the lifting frames 3. Connecting blocks 6 are fixedly connected to the bottom front sides of both lifting frames 3. Push rods 7 are rotatably connected to adjacent sides of the two connecting blocks 6. The push rods 7 can rotate freely within a certain angle range. The front end of each of the two rods 7 is rotatably connected to a connecting block 8. The front middle of each of the two lifting frames 3 is fixedly connected to a carrying rack 9. The front outer wall of each of the two connecting blocks 8 is fixedly connected to the rear outer wall of the carrying rack 9. When the pushing rod 7 applies force to the connecting block 8, the connecting block 8 will transmit this force to the carrying rack 9, thereby causing the carrying rack 9 to move back and forth in the horizontal direction. Multiple buffer strips 10 are fixedly connected to the front outer wall of each of the two carrying racks 9. Rotating frames 11 are rotatably connected to the bottom front of each of the two carrying racks 9. Push rods 12 are fixedly connected to the bottom of each of the two rotating frames 11. The rear ends of the two push rods 12 are fixedly connected to the bottom of the two carrying racks 9. A sliding component is provided on the adjacent side of the lifting frame 3. Fixing mechanisms 2 are provided on the left and right sides of the outer wall of each of the two lifting frames 3. The fixing mechanisms 2 are used to prevent the goods from collapsing when the road surface is tilted.

[0032] Specifically, the fixed frame 1 is securely installed on the forklift body, providing overall support. Its outer front wall is slidably connected to the lifting frame 3, allowing the lifting frame 3 to move up and down via guide rails to meet different cargo lifting height requirements. Multiple connecting plates 4 at the rear of the fixed frame 1 evenly distribute the force during cargo handling, enhancing the connection strength with the forklift body. Push rod 1 5 connects the rear bottom of the fixed frame 1 to the top rear of the lifting frame 3, converting the linear motion of the forklift's power system into the lifting motion of the lifting frame 3. Connecting block 1 6 is fixed to the front bottom of the lifting frame 3, providing support for push rod 2 7. The pivot point rotates, and as the lifting frame 3 moves, the angle of the push rod 7 changes. This causes the carrier rack 9 to move back and forth via the connecting block 8, facilitating precise picking up of goods by the forks. The buffer strip 10 on the front side of the carrier rack 9 is made of elastic rubber material, which can buffer the impact force when goods collide with the carrier rack 9, protecting both the goods and the carrier rack 9. The rotating frame 11 is rotatably connected to the bottom front side of the carrier rack 9. When the forklift encounters special circumstances that cause the carrier rack 9 to tilt, the push rod 12 will adjust its length or angle to cause the rotating frame 11 to rotate, thereby adjusting the posture of the fork front end and maintaining the stability of goods handling.

[0033] Reference Figure 2 , Figure 4 and Figure 5 The fixing mechanism 2 includes two fixing plates 201, the front sides of which are fixedly connected to the rear bottom of the rack 9. Sliding blocks 202 are slidably connected to the left and right sides of the outer walls of the two fixing plates 201. The sliding blocks 202 can move flexibly along the left and right directions of the outer walls of the fixing plates 201. Multiple fixing holes 203 are provided on the outer walls of the two sliding blocks 202. Rotating blocks 204 are fixedly connected to the left and right sides of the outer walls of the two racks 9. When the sliding blocks 202 move to the appropriate position, they can be adjusted by cooperating with the rotating valve 207. Sliding block 202 is fixed on fixed plate 201. Baffle 205 is rotatably connected to the adjacent side of the two rotating blocks 204. Baffle 205 can rotate freely around the rotating block 204 within a certain angle range. Sliding groove 206 is provided on the opposite side of the two baffles 205. The inner wall of the two sliding grooves 206 is slidably connected to the outer wall of the two sliding blocks 202 respectively. Rotary valve 207 is provided at the left and right ends of the outer wall of the two fixed plates 201. The two fixed holes 203 are threaded to the left and right sides of the outer wall of the fixed plate 201 through the rotary valve 207.

[0034] Specifically, the fixing mechanism 2 consists of two fixing plates 201, whose front sides are firmly fixed to the rear bottom of the rack 9, acting like a solid base to provide a stable platform for the installation of subsequent components, ensuring the stability of the rack 9 during operation, effectively distributing the weight of the goods and external forces, and ensuring safe and reliable handling. Sliding blocks 202 are slidably connected to the left and right sides of the outer walls of the two fixing plates 201, allowing for flexible left and right movement via guide rails and sliders. Multiple carefully designed and spaced fixing holes 203 are provided on the outer wall of the sliding blocks 202, which cooperate with the rotary valve 207. When the sliding blocks 202 move to a position suitable for the size of the goods, the screw of the rotary valve 207 is screwed in. The fixing hole 203 generates friction against the inner wall of the fixing plate 201, firmly fixing the sliding block 202 and preventing displacement during handling. The rotating blocks 204 on the left and right sides of the outer wall of the rack 9 provide a fulcrum for the baffle 205. When picking up goods with forks, the baffle 205 can rotate upward to avoid the forks. When handling, the goods are lowered to limit them and prevent them from slipping. The side of the baffle 205 away from the rotating block 204 has a sliding groove 206, which slides and connects to the outer wall of the sliding block 202. When the sliding block 202 slides along the fixing plate 201, the baffle 205 adjusts its position synchronously with the sliding groove 206 to adapt to different goods. The close cooperation enhances its stability and ensures efficient limiting of goods.

[0035] Reference Figure 1 , Figure 2 and Figure 3The adjustment assembly includes multiple positioning bars 13. The opposite sides of the multiple positioning bars 13 are fixedly connected to the adjacent sides of the two lifting frames 3. The middle adjacent sides of the two positioning bars 13 are fixedly connected to positioning sleeves 14. The top adjacent sides of the two lifting frames 3 are slidably connected to guide bars 15. The lifting action of the lifting frames 3 needs to maintain a consistent and stable height. The positioning bars 13, by connecting the two lifting frames 3 together, restrict the arbitrary changes in their relative positions and ensure that the two lifting frames 3 can operate synchronously during the rising or falling process. The front side of the outer wall of the two rotating frames 11 is provided with protective sleeves 18. The rear side of the two protective sleeves 18 is fixedly connected to the front side of the two rotating frames 11 respectively. The guide bars 15 play a guiding role in the entire fork structure. When the lifting frame 3 moves up and down, the guide bars 15 can guide the lifting frame 3 to move smoothly along a specific direction. The rear side of the outer wall of the two load racks 9 is provided with mounting grooves 19. The inner walls of the two mounting grooves 19 are fixedly connected to the front side of the two connecting blocks 8 respectively. The relative position between the connecting blocks 8 and the load racks 9 remains unchanged.

[0036] Specifically, multiple positioning strips 13 are fixed at a distance from each other on the adjacent side of the two lifting frames 3 to ensure that the two lifting frames 3 operate synchronously during operation. The positioning sleeve 14 is fastened to one side of the positioning strip 13. The sliding cargo plates are connected to each other through guide strips 15. The joint position of the positioning sleeve 14 and the positioning strip 13 can be adjusted by sliding to quickly adjust the distance between the sliding cargo plates, thereby adapting to the cargo loading requirements of different widths.

[0037] Reference Figure 1 , Figure 2 and Figure 4 Each of the two lifting frames 3 has a mounting groove 20 at its front bottom. The inner walls of the two mounting grooves 20 are fixedly connected to the rear side of the outer wall of the connecting block 6, which can be firmly fixed to the lifting frame 3. The upper and lower sides of the outer walls of the two fixing plates 201 are fixedly connected to the connecting pieces 21. The front sides of the two connecting pieces 21 are threadedly connected to the rear bottom of the rack 9. The threaded connection has the advantage of convenient installation and disassembly. The rear side of the outer walls of the two fixing plates 201 is provided with a protective sleeve 16. The front end of the two protective sleeves 16 is provided with a mounting hole 17. The inner walls of the two mounting holes 17 are fixedly connected to the rear side of the fixing plate 201, which can absorb the impact force.

[0038] Specifically, the mounting grooves 20 at the bottom front of the two lifting frames 3 have their inner walls fixedly connected to the rear outer wall of the connecting block 6. The mounting grooves 20 provide a precise installation position for the connecting block 6. The two are typically connected by interference fit, welding, or bolting to ensure the connecting block 6 is firmly fixed to the lifting frame 3. Connecting pieces 21 are fixedly connected to the upper and lower outer walls of the two fixing plates 201, with their front sides threaded to the bottom rear side of the rack 9. The connecting pieces 21 serve as a bridge between the fixing plates 201 and the rack 9. After being reliably fixed to the fixing plates 201, they connect to the rack 9 via threads, facilitating installation and disassembly, routine maintenance, and component replacement. The protective sleeve 16 reduces wear on the fixing plates 201, isolates dust and moisture, prevents rust, extends the service life of the fixing plates 201, and ensures the normal operation of the fixing mechanism 2.

[0039] Working principle: The fixed frame 1 is firmly installed on the forklift body, providing a support platform for the whole. The push rod 5 fixed at the bottom rear side transmits the power of the forklift to the lifting frame 3 in a linear motion, so that the lifting frame 3 can slide up and down along the front side of the outer wall of the fixed frame 1 to adapt to different cargo stacking heights. The connecting block 6 at the bottom front side of the lifting frame 3 serves as the rotation fulcrum of the push rod 7. When the lifting frame 3 rises or falls, the angle of the push rod 7 changes, which drives the carrier rack 9 to move back and forth through the connecting block 8, helping the forks to accurately pick up the goods. The buffer strip 10 at the front side of the carrier rack 9 can buffer the collision impact force between the goods and the carrier rack 9 when the goods are picked up or put down, protecting the goods and the carrier rack 9. The rotating frame 11 rotatably connected to the bottom front side of the carrier rack 9 can adjust the posture with the help of the push rod 12 connected at the bottom when the forklift encounters special working conditions, causing the carrier rack 9 to tilt and sway, maintaining the stability of the goods handling and preventing slippage. All components work together to efficiently complete the forklift's goods handling task.

[0040] Furthermore, the sliding block 202, which is slidably connected to the left and right sides of the outer wall of the fixed plate 201, can move flexibly along the fixed plate 201 according to the size of the goods. The multiple fixing holes 203 on the outer wall of the sliding block 202 cooperate with the rotary valves 207 at the left and right ends of the outer wall of the fixed plate 201. When the sliding block 202 is adjusted to a suitable position, the rotary valve 207 is rotated so that its screw is screwed into the fixing hole 203. The friction generated by the threaded connection fixes the sliding block 202. The rotary blocks 204 on the left and right sides of the outer wall of the rack 9 are rotatably connected to the baffle 205. The slide groove 206 on the other side of the baffle 205 is slidably connected to the outer wall of the sliding block 202. When handling goods, if the size of the goods is different, the sliding block 202 moves to drive the baffle 205 to adjust its position, which plays a limiting role for the goods and prevents the goods from sliding off the sides of the rack 9 during handling.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable forklift fork structure, comprising two fixed frames (1), characterized in that: Lifting frames (3) are slidably connected to the front side of the outer wall of each of the two fixed frames (1). Multiple connecting plates (4) are fixedly connected to the left and right sides of the rear end of each of the two fixed frames (1). Push rods (5) are fixedly connected to the bottom of the rear side of each of the two fixed frames (1). The top of each push rod (5) is fixedly connected to the rear top of each of the two lifting frames (3). Connecting blocks (6) are fixedly connected to the bottom of the front side of each of the two lifting frames (3). Push rods (7) are rotatably connected to the adjacent side of each of the two connecting blocks (6). Connecting blocks (8) are rotatably connected to the front end of each of the two push rods (7). A rack (9) is fixedly connected to the middle of the front side of each of the two lifting frames (3). The outer front sides of the two connecting blocks (8) are respectively fixedly connected to the rear side of the outer wall of the rack (9). Multiple buffer strips (10) are fixedly connected to the outer front sides of the two racks (9). Rotating frames (11) are rotatably connected to the bottom of the front side of the two racks (9). Push rods (12) are fixedly connected to the bottom of the two rotating frames (11). The rear ends of the two push rods (12) are fixedly connected to the bottom of the two racks (9). Adjustment components are provided on the adjacent side of the two lifting frames (3). Fixing mechanisms (2) are provided on the left and right sides of the outer walls of the two lifting frames (3). The fixing mechanisms (2) are used to prevent the goods from collapsing when the road surface is tilted.

2. The adjustable forklift fork structure according to claim 1, characterized in that: The fixing mechanism (2) includes two fixing plates (201). The front sides of the two fixing plates (201) are fixedly connected to the bottom rear side of the rack (9). Sliding blocks (202) are slidably connected to the left and right sides of the outer walls of the two fixing plates (201). Multiple fixing holes (203) are opened on the outer walls of the two sliding blocks (202). Rotating blocks (204) are fixedly connected to the left and right sides of the outer walls of the two racks (9). Baffles (205) are rotatably connected to the adjacent side of the two rotating blocks (204). Slide grooves (206) are opened on the opposite side of the two baffles (205). The inner walls of the two slide grooves (206) are slidably connected to the outer walls of the two sliding blocks (202). Rotary valves (207) are provided at the left and right ends of the outer walls of the two fixing plates (201). The two fixing holes (203) are threadedly connected to the left and right sides of the outer walls of the fixing plates (201) through the rotary valves (207).

3. The adjustable forklift fork structure according to claim 1, characterized in that: The adjustment assembly includes multiple positioning bars (13), with the opposite sides of the multiple positioning bars (13) respectively fixedly connected to the adjacent sides of the two lifting frames (3), and a positioning sleeve (14) fixedly connected to the adjacent sides of the middle of the two positioning bars (13), and a guide bar (15) slidably connected to the adjacent sides of the top of the two lifting frames (3).

4. The adjustable forklift fork structure according to claim 1, characterized in that: The front side of the outer wall of each of the two rotating frames (11) is provided with a protective sleeve (18), and the rear side of the two protective sleeves (18) is fixedly connected to the front side of the two rotating frames (11).

5. The adjustable forklift fork structure according to claim 1, characterized in that: The outer rear side of the two load racks (9) is provided with mounting groove 1 (19), and the inner wall of the two mounting grooves 1 (19) is fixedly connected to the front side of the two connecting blocks 2 (8).

6. The adjustable forklift fork structure according to claim 1, characterized in that: The two lifting frames (3) are respectively provided with mounting grooves (20) on the front bottom, and the inner walls of the two mounting grooves (20) are respectively fixedly connected to the rear side of the outer wall of the connecting block (6).

7. The adjustable forklift fork structure according to claim 2, characterized in that: Connecting pieces (21) are fixedly connected to the upper and lower sides of the outer walls of the two fixing plates (201), and the front sides of the two connecting pieces (21) are threadedly connected to the bottom rear side of the rack (9).

8. The adjustable forklift fork structure according to claim 2, characterized in that: The outer rear side of the two fixing plates (201) is provided with a protective sleeve (16), and the front end of the two protective sleeves (16) is provided with a mounting hole (17). The inner wall of the two mounting holes (17) is fixedly connected to the rear side of the fixing plate (201).

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