Commercial pick-up with cantilever function

Abstract

The application discloses a commercial pick-up truck with cantilever function and relates to the technical field of pick-up trucks. The pick-up truck comprises a pick-up truck body, and a carrying mechanism is arranged in the cargo compartment of the pick-up truck body. The carrying mechanism comprises a fixing seat, the outer wall of the fixing seat is fixedly connected with the inner wall of the pick-up truck body, the outer wall of the fixing seat is rotationally connected with a rotating pile through a bearing, the lower side of the rotating pile is arranged on the outer side of the fixing seat, the upper side of the fixing seat and the lower side of the rotating pile are provided with a mounting cavity, the inner wall of the mounting cavity is provided with a first motor at the lower side, the outer wall of the first motor is fixedly connected with the inner wall of the fixing seat, and the output end of the first motor is drivingly connected with the inner wall of the rotating pile through a gear. The carrying mechanism can conveniently carry goods into the cargo compartment of the pick-up truck body, and the carrying mechanism is convenient to operate and has the characteristics of high practicability and stable carrying of goods into the cargo compartment.

Description

Technical Field

[0001] This invention relates to the field of pickup truck technology, specifically to a commercial pickup truck with a cantilever function. Background Technology

[0002] Pickup trucks, mini-trucks, and other small trucks are increasingly used for logistics, passenger transport, and freight transportation. As people increasingly utilize machinery, they also want to load and unload lighter items using specialized cranes. However, existing truck-mounted cranes are relatively heavy, large in size, and have high lifting capacity, making them unsuitable for installation on small pickup trucks and mini-trucks. Because no small crane can meet the requirements of pickup trucks and mini-trucks, the loading and unloading of lighter goods is mostly done manually, resulting in a significant waste of manpower. Existing lifting devices generally use cantilevered booms and lifting ropes to lift goods, but this method requires manual securing, which is inconvenient and poses a safety hazard due to the instability of the goods during movement.

[0003] Therefore, it is essential to design a commercial pickup truck with a cantilever function that is highly practical and can reliably transport goods to the cargo box. Summary of the Invention

[0004] The purpose of this invention is to provide a commercial pickup truck with a cantilever function to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a commercial pickup truck with cantilever function, including a pickup truck body, wherein a handling mechanism is provided inside the cargo box of the pickup truck body;

[0006] The transport mechanism includes a fixed base fixed to the inner wall of the pickup truck body, a rotating pile sleeved on the fixed base, an installation cavity between the fixed base and the rotating pile, a first motor inside the installation cavity, the first motor fixed on the fixed base, the output end of the first motor being connected to the rotating pile for transmission, and a cantilever that can be tilted up and down on the rotating pile.

[0007] According to the above technical solution, a second motor is fixedly connected to the upper end of the rotating pile, and the cantilever is fixedly connected to the output end of the second motor. The cantilever is deflected up and down by the second motor. A first fixed frame is fixedly connected to one upper end of the cantilever, and a second fixed frame is fixedly connected to the other upper end of the cantilever. A first rotating rod is provided through the first fixed frame, and the first rotating rod can rotate within the first fixed frame. A take-up roller is sleeved in the middle of the first rotating rod, and the take-up roller can rotate with the first rotating rod. A rotatable rotating roller is provided on the second fixed frame. A third motor is fixedly connected to the cantilever. The output end of the third motor is connected to the first rotating rod via a transmission belt. A cable is fixedly connected to the outer wall of the take-up roller. The cable is wound around the surface of the take-up roller. A through hole is provided on the side of the cantilever near the rotating roller. One end of the cable passes around the rotating roller and through the through hole. A cargo placement mechanism is provided at the lower end of the cable. A cargo pushing mechanism is also provided on the outer wall of the fixed base. The cargo pushing mechanism can push the cargo in the pickup truck body away from the rotating pile.

[0008] According to the above technical solution, the placement mechanism includes a connecting block, which is fixedly connected to the lower end of the pull cable. Four pull ropes are fixedly connected to the lower surface of the connecting block, and the lower ends of the four pull ropes are fixedly connected to a first placement plate and a second placement plate that are spliced ​​into a whole plate.

[0009] According to the above technical solution, a slot is provided on one side of the first placement plate, and an insert is provided on the side of the second placement plate near the slot, and the insert is inserted into the slot.

[0010] According to the above technical solution, one end of each of the four pull ropes is fixed in a loop to the lower surface of the connecting block, and the other end of each of the four pull ropes is fixed to the four corners of the first placement plate and the second placement plate spliced ​​together to form a whole plate.

[0011] According to the above technical solution, handles are fixedly connected to the upper side of the outer wall of both the first placement plate and the second placement plate.

[0012] According to the above technical solution, the placement mechanism further includes a first spring, the lower end of which is fixed to the connecting block, and a fixing plate is fixedly connected to the upper end of the first spring. The pull cable passes through the first spring and the fixing plate. Two first conductive plates are fixedly connected to the upper side of the fixing plate. The placement mechanism also includes two second conductive plates that can respectively fit with the two first conductive plates. The second conductive plates are fixedly connected to the cantilever. Two wires are provided on the fixing plate. One end of each of the two wires is electrically connected to the two first conductive plates. The pull rope has a hollow internal structure. A second spring is provided inside the pull rope. The upper and lower ends of the second spring are fixedly connected to the inner wall of the pull rope. The other ends of the two wires pass through the connecting block and the pull rope and are electrically connected to the two ends of the second spring respectively.

[0013] According to the above technical solution, the second conductive sheet is disposed correspondingly to the first conductive sheet, the second conductive sheet is located on the upper side of the first conductive sheet, and the first conductive sheet can move with the fixing sheet and the cable, and the second conductive sheet is located on the movement path of the first conductive sheet.

[0014] According to the above technical solution, the pushing mechanism includes a first connecting arm, one end of which is fixedly connected to the fixed base, and the other end of which is provided with a rotatable rotating block. A second connecting arm is fixedly connected to the rotating block, and a slide block is hinged to the end of the second connecting arm away from the first connecting arm. The pushing mechanism also includes a slide rail, which is fixedly connected to the outer wall of the pickup truck body. The slide block can slide on the slide rail, and a push plate is hinged to the side of the slide block away from the slide rail by a torsion spring.

[0015] According to the above technical solution, the push plate has a protruding structure on the side near the fixed seat, and the protruding structure contacts the outer wall of the slide. The second connecting arm has an extension structure on the side away from the fixed seat, and the extension structure contacts the outer wall of the first connecting arm.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] By incorporating a handling mechanism, goods can be easily moved into the cargo bed of the pickup truck, eliminating the need for manual operation and making it convenient to use.

[0018] By incorporating a placement mechanism, the swaying amplitude of goods relative to the cantilever can be reduced during transportation, thereby avoiding the problem of excessive swaying amplitude caused by ordinary hanging ropes and thus increasing safety.

[0019] By incorporating a first placement plate, a second placement plate, and a handle, the first and second placement plates can be easily removed after the goods are placed on the pickup truck body, reducing the force required to retrieve the goods.

[0020] By incorporating a cargo-pushing mechanism, the rotating pile can push previously transported goods through a push plate, thereby adjusting the weight distribution of the pickup truck and preventing safety hazards caused by uneven weight distribution. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of part of the structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the rotating pile of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the conveying mechanism of the present invention;

[0026] Figure 5 This is a three-dimensional structural schematic diagram of the placement mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the pull rope of the present invention;

[0028] Figure 7 This is a schematic diagram of the lower structure of the cantilever of the present invention.

[0029] In the diagram: 1. Pickup truck body; 2. Handling mechanism; 201. Fixed base; 202. Rotary pile; 203. First motor; 204. Second motor; 205. Cantilever; 206. First fixed frame; 207. First rotating rod; 208. Rewind roller; 209. Second fixed frame; 210. Rotary roller; 211. Third motor; 212. Drive belt; 213. Cable; 214. Placement mechanism; 215. Pushing mechanism; 401. Connecting block; 402. Pull rope; 403. First placement plate; 404. Second placement plate; 405. Handle; 406. First spring; 407. Fixing plate; 408. First conductive plate; 409. Second conductive plate; 410. Wire; 411. Second spring; 501. First connecting arm; 502. Rotating block; 503. Second connecting arm; 504. Slide block; 505. Slide rail; 506. Push plate. Detailed Implementation

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

[0031] Please see Figure 1-7 The present invention provides a technical solution: a commercial pickup truck with cantilever function, including a pickup truck body 1, and a handling mechanism 2 is provided inside the cargo box of the pickup truck body 1;

[0032] The handling mechanism 2 includes a fixed base 201. The outer wall of the fixed base 201 is fixedly connected to the inner wall of the pickup truck body 1. A pivot 202 is rotatably connected to the outer wall of the fixed base 201 via a bearing. The lower side of the pivot 202 is sleeved on the outer side of the fixed base 201. An installation cavity is provided on the upper side of the fixed base 201 and the lower side of the pivot 202. A first motor 203 is provided on the lower side of the inner wall of the installation cavity. The lower side of the outer wall of the first motor 203 is fixedly connected to the inner wall of the fixed base 201. The output end of the first motor 203 is connected to the inner wall of the pivot 202 via a gear. A cantilever 205 that can be tilted up and down is provided at the upper end of the pivot 202.

[0033] A second motor 204 is fixedly connected to the upper end of the rotating pile 202. A cantilever 205 is fixedly connected to the output end of the second motor 204. The outer wall of the cantilever 205 is hinged to the upper outer wall of the rotating pile 202. A first fixing frame 206 is fixedly connected to one upper end of the cantilever 205, and a second fixing frame 209 is fixedly connected to the other upper end of the cantilever 205. A first rotating rod 207 is rotatably connected to the inner wall of the outer wall of the first fixing frame 206 via bearings. One end of the first rotating rod 207 extends through the first fixing frame 206 to the other side of the first fixing frame 206. A take-up roller 208 is fixedly connected to the middle of the outer wall of the first rotating rod 207. The outer wall of the second fixing frame 209... A rotating roller 210 is rotatably connected via bearings. A third motor 211 is fixedly connected to the outer wall of the cantilever 205. The output end of the third motor 211 is connected to the outer wall of the first rotating rod 207 via a transmission belt 212. A cable 213 is fixedly connected to the outer wall of the take-up roller 208. The cable 213 is wound around the surface of the take-up roller 208. A through hole is provided on the side of the cantilever 205 near the rotating roller 210. One end of the cable 213 extends from the through hole on the cantilever 205 to the lower side of the cantilever 205, passing over the upper side of the rotating roller 210. A placement mechanism 214 is provided at the lower end of the cable 213. A pushing mechanism 215 is also provided on the outer wall of the fixed base 201. The pushing mechanism 215 can push the goods in the pickup truck body 1 away from the rotating pile 202, thereby readjusting the center of gravity of the pickup truck body 1 and avoiding the safety hazards caused by the instability of the center of gravity of the pickup truck body 1 during the operation of the handling mechanism 2.

[0034] The placement mechanism 214 includes a connecting block 401. The upper side of the outer wall of the connecting block 401 is fixedly connected to the lower end of the pull cable 213. Four pull ropes 402 are fixedly connected to the lower surface of the connecting block 401. The four pull ropes 402 are divided into two groups, and the two groups of pull ropes 402 are symmetrically arranged. The lower ends of the two groups of pull ropes 402 are respectively fixedly connected to a first placement plate 403 and a second placement plate 404. A slot is provided on the first placement plate 403. The outer wall of the second placement plate 404 is inserted into the slot on the first placement plate 403. Handles 405 are fixedly connected to the upper side of the outer walls of both the second placement plate 404 and the first placement plate 403.

[0035] After the first placement plate 403 and the second placement plate 404 are placed inside the pickup truck body 1, if the cargo is too heavy to be easily removed from the first placement plate 403 and the second placement plate 404, the handle 405 can be pulled quickly. Since the lower sides of the second placement plate 404 and the first placement plate 403 are relatively smooth, the second placement plate 404 and the first placement plate 403 will be pulled out quickly, so that the cargo can be placed inside the pickup truck body 1.

[0036] When lifting goods, the first motor 203 is started, which drives the slewing pile 202 to rotate via gear transmission. The slewing pile 202 then drives the cantilever 205. After the cantilever 205 rotates to the outside of the pickup truck body 1, the second motor 204 is started, which drives the cantilever 205 to deflect downward. Then, the third motor 211 is started, which drives the first rotating rod 207 to rotate via the transmission belt 212. This causes the first rotating rod 207 and the winding roller 208 to rotate and loosen the cable 213, causing the lower end of the cable 213 to extend downward. This allows the lower sides of the second placement plate 404 and the first placement plate 403 to contact the ground. After the goods are placed on the upper side of the first placement plate 403 and the second placement plate 404, the operation begins. The third motor 211 is activated, which drives the first rotating rod 207 and the winding roller 208 to rotate and wind up the cable 213 via the transmission belt 212. The cable 213 lifts the connecting block 401, the pull rope 402, the first placement plate 403, and the second placement plate 404. At the same time, the second motor 204 is activated to drive the cantilever 205 to deflect and reset. After the lower side of the first placement plate 403 and the second placement plate 404 is higher than the pickup truck body 1, the first motor 203 is activated to drive the rotating pile 202 to rotate, moving the placement mechanism 214 into the cargo box of the pickup truck body 1. Then, the placement mechanism 214 is lowered to place the goods into the cargo box, achieving the effect of facilitating the placement of goods into the pickup truck body 1.

[0037] The placement mechanism 214 also includes a first spring 406, the lower end of which is fixedly connected to the upper side of the outer wall of the connecting block 401. A fixing plate 407 is fixedly connected to the upper end of the connecting block 401. The inner wall of the fixing plate 407 is slidably connected to the outer wall of the cable 213. Two first conductive plates 408 are fixedly connected to the upper side of the fixing plate 407. The placement mechanism 214 also includes two second conductive plates 409, the upper side of the outer wall of the second conductive plates 409 is fixedly connected to the lower side of the cantilever 205. Two wires 410 are provided on the fixing plate 407, and the upper ends of the two wires 410 are electrically connected to the two first conductive plates 408 respectively. Next, the pull rope 402 has a hollow structure inside, and a second spring 411 is installed inside the pull rope 402. The upper and lower ends of the second spring 411 are fixedly connected to the inner wall of the pull rope 402. The lower ends of the two wires 410 pass through the connecting block 401 and the pull rope 402 and are electrically connected to the two ends of the second spring 411 respectively. The positions of the second conductive piece 409 and the first conductive piece 408 are correspondingly set. The second conductive piece 409 is located on the upper side of the first conductive piece 408, and the first conductive piece 408 can move with the fixed piece 407 and the pull cable 213. The second conductive piece 409 is located on the movement path of the first conductive piece 408.

[0038] Before use, the second conductive sheet 409 is powered by the vehicle's power supply. When the cable 213 is wound up to lift the goods, it first moves the connecting block 401 and the pull rope 402 upward, causing the first placement plate 403 and the second placement plate 404 to lift the goods upward. When the fixing plate 407 is pulled to its highest point by the cable 213, the upper side of the first conductive sheet 408 contacts the lower side of the second conductive sheet 409. The cable 213 continues to pull, causing the fixing plate 407 to move downward relative to the connecting block 401, which in turn causes the first spring 406 to contract and form an elastic support, making the first conductive sheet 408 and the second conductive sheet 409 fit tightly together. After the first conductive sheet 408 and the second conductive sheet 409 come into contact, the first conductive sheet 408 and the second conductive sheet 409... The wire 410, the second spring 411, and the second conductive sheet 409 form a circuit, energizing the second spring 411. The two springs 411 generate a mutual attraction force, causing them to contract. When the cantilever 205 deflects and drives the placement mechanism 214 to move, due to inertia, the placement mechanism 214 will lag behind the cantilever 205. At the same time, the contraction of the second spring 411 pulls the first placement plate 403 and the second placement plate 404, shortening the pulling arm of the cantilever 205 on the first placement plate 403 and the second placement plate 404. This reduces the range of motion of the first placement plate 403 and the second placement plate 404 relative to the cantilever 205, thereby ensuring the stability of the goods during movement and preventing the goods from tipping over.

[0039] The pushing mechanism 215 includes a first connecting arm 501, one end of which is fixedly connected to the outer wall of the fixed base 201. The inner wall of the other end of the first connecting arm 501 is rotatably connected to a rotating block 502 via a bearing. A second connecting arm 503 is fixedly connected to the upper outer wall of the rotating block 502. A slide block 504 is hinged to the end of the second connecting arm 503 away from the first connecting arm 501. The pushing mechanism 215 also includes a slide rail 505, the outer wall of which is fixedly connected to the outer wall of the pickup truck body 1. The inner wall of the slide block 504 is slidably connected to the outer wall of the slide rail 505. A push plate 506 is hinged to the side away from the slide rail 505 by a torsion spring. The side of the push plate 506 near the fixed seat 201 has a protruding structure. The protruding structure contacts the outer wall of the slide 504. The protruding structure can be an L-shaped plate or an inclined block. When the push plate 506 pushes the goods through the protruding structure, the push plate 506 has a support point and will not be compressed by the reverse force of the goods to rotate, thus preventing the goods from being pushed. The side of the second connecting arm 503 away from the fixed seat 201 has an extension structure. The extension structure of the second connecting arm 503 contacts the outer wall of the first connecting arm 501.

[0040] When the rotating pile 202 rotates to extend the cantilever 205 out of the pickup truck body 1 to retrieve goods, the outer wall of the fixed seat 201 drives the first connecting arm 501 to rotate, causing one end of the first connecting arm 501 to push the rotating block 502 and the second connecting arm 503 to move. When the second connecting arm 503 is pushed to move, the slide 504 will slide along the slide rail 505 to the side away from the fixed seat 201, thereby causing the slide 504 to drive the push plate 506 to move, and the push plate 506 to push the goods inside the pickup truck body 1 to the side away from the fixed seat 201, so that the counterweight on the pickup truck body 1 is evenly distributed, avoiding uneven counterweight of the pickup truck body 1 caused by the handling mechanism 2 during operation, and avoiding safety hazards during use.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A commercial pickup truck with cantilever function, comprising a pickup truck body (1), characterized in that: The pickup truck body (1) is equipped with a handling mechanism (2) inside the cargo box. The transport mechanism (2) includes a fixed seat (201) fixed on the inner wall of the pickup truck body (1), a rotating pile (202) is sleeved on the fixed seat (201), an installation cavity is provided between the fixed seat (201) and the rotating pile (202), a first motor (203) is provided in the installation cavity, the first motor (203) is fixed on the fixed seat (201), the output end of the first motor (203) is connected to the rotating pile (202) for transmission, and a cantilever (205) that can be tilted up and down is provided on the rotating pile (202). The upper end of the rotating pile (202) is fixedly connected to a second motor (204), and the output end of the second motor (204) is fixedly connected to the cantilever (205). One upper end of the cantilever (205) is fixedly connected to a first fixing frame (206), and the other upper end of the cantilever (205) is fixedly connected to a second fixing frame (209). A first rotating rod (207) is passed through the first fixing frame (206), and the first rotating rod (207) can rotate within the first fixing frame (206). A take-up roller (208) is sleeved in the middle of the first rotating rod (207), and the take-up roller (208) can rotate with the first rotating rod (207). A rotatable rotating roller (210) is provided on the second fixing frame (209). The cantilever (205) is also fixedly connected to... The third motor (211) is connected to the first rotating rod (207) via a transmission belt (212) at its output end. A cable (213) is fixedly connected to the outer wall of the take-up roller (208). The cable (213) is wound around the surface of the take-up roller (208). A through hole is provided on the side of the cantilever (205) near the rotating roller (210). One end of the cable (213) passes around the rotating roller (210) and through the through hole. A placement mechanism (214) for placing goods is provided at the lower end of the cable (213). A pushing mechanism (215) is also provided on the outer wall of the fixed base (201). The pushing mechanism (215) can push the goods in the pickup truck body (1) away from the rotating pile (202). The pushing mechanism (215) includes a first connecting arm (501), one end of which is fixedly connected to the fixed base (201), and the other end of which is provided with a rotatable rotating block (502). A second connecting arm (503) is fixedly connected to the rotating block (502). A slide block (504) is hinged to the end of the second connecting arm (503) away from the first connecting arm (501). The pushing mechanism (215) also includes a slide rail (505), which is fixedly connected to the outer wall of the pickup truck body (1). The slide block (504) can slide on the slide rail (505). A push plate (506) is hinged to the side of the slide block (504) away from the slide rail (505) by a torsion spring.

2. A commercial pickup truck with cantilever function according to claim 1, characterized in that: The placement mechanism (214) includes a connecting block (401), which is fixedly connected to the lower end of the cable (213). Four pull ropes (402) are fixedly connected to the lower surface of the connecting block (401), and the lower ends of the four pull ropes (402) are fixedly connected to a first placement plate (403) and a second placement plate (404) that are spliced ​​into a whole plate.

3. A commercial pickup truck with cantilever function according to claim 2, characterized in that: The first placement plate (403) has a slot on one side, and the second placement plate (404) has a strip on the side near the slot, and the strip is inserted into the slot.

4. A commercial pickup truck with cantilever function according to claim 2, characterized in that: One end of each of the four pull ropes (402) is fixed in a loop to the lower surface of the connecting block (401), and the other end of each of the four pull ropes (402) is fixed to the four corners of the first placement plate (403) and the second placement plate (404) spliced ​​together to form a whole plate.

5. A commercial pickup truck with cantilever function according to claim 2, characterized in that: Handles (405) are fixedly connected to the upper outer walls of the first placement plate (403) and the second placement plate (404).

6. A commercial pickup truck with cantilever function according to claim 2, characterized in that: The placement mechanism (214) further includes a first spring (406), the lower end of which is fixed to the connecting block (401), and a fixing plate (407) is fixedly connected to the upper end of the first spring (406). The cable (213) passes through the first spring (406) and the fixing plate (407). Two first conductive plates (408) are fixedly connected to the upper side of the fixing plate (407). The placement mechanism (214) also includes two second conductive plates (409) that can respectively fit with the two first conductive plates (408). The second conductive plates (409) are fixedly connected to... On the cantilever (205), two wires (410) are provided on the fixing plate (407). One end of the two wires (410) is electrically connected to the two first conductive plates (408) respectively. The inside of the pull rope (402) is a hollow structure. A second spring (411) is provided inside the pull rope (402). The upper and lower ends of the second spring (411) are fixedly connected to the inner wall of the pull rope (402). The other ends of the two wires (410) pass through the connecting block (401) and the pull rope (402) and are electrically connected to the two ends of the second spring (411) respectively.

7. A commercial pickup truck with cantilever function according to claim 6, characterized in that: The second conductive sheet (409) is disposed corresponding to the first conductive sheet (408). The second conductive sheet (409) is located on the upper side of the first conductive sheet (408), and the first conductive sheet (408) can move with the fixed sheet (407) and the cable (213). The second conductive sheet (409) is located on the movement path of the first conductive sheet (408).

8. A commercial pickup truck with cantilever function according to claim 1, characterized in that: The push plate (506) has a protruding structure on the side near the fixed base (201), and the protruding structure contacts the outer wall of the slide (504). The second connecting arm (503) has an extension structure on the side away from the fixed base (201), and the extension structure contacts the outer wall of the first connecting arm (501).

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