A battery detection device for a battery swap station

Abstract

The application relates to the technical field of electric vehicle battery replacement, and discloses a battery detection device for a battery replacement station, which comprises a main body, the main body further comprises a plurality of roller groups fixedly connected to the inner wall of the bottom, the roller groups are distributed in pairs on the main body at equal intervals, a plurality of curved grooves are arranged in the main body and are symmetrically distributed about the main body as the center. The battery detection device for the battery replacement station is characterized in that a cleaning mechanism is arranged, the cleaning mechanism comprises an inclined table, a rotating plate and a rubber sheet, when a vehicle drives in, the weight of the vehicle is used to drive the rotating plate to extrude the rubber sheet so that the rubber sheet is in contact with the vehicle chassis and generates static electricity through friction, thus realizing automatic cleaning of the vehicle chassis and the bottom of the battery, reducing the situation that detection deviation occurs in a detection camera due to dust and stains, and helping to improve the detection accuracy of the battery detection device.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery swapping technology, and more specifically to a battery testing device for battery swapping stations. Background Technology

[0002] Battery testing equipment at battery swapping stations is used for safety screening and performance evaluation of power batteries throughout the entire process, and can quickly complete testing at each stage: battery warehousing, swapping, and charging before delivery. The equipment uses methods such as visual scanning, thermal imaging, high-voltage insulation, and cell internal resistance voltage acquisition to detect potential thermal runaway hazards such as bulging, leakage, current leakage, and excessive cell temperature differences. Existing battery testing equipment at battery swapping stations uses a testing head on the bottom loading and unloading plate to perform visual inspection of the battery. Since most vehicles undergo battery swapping directly after entering the work station, mud and dust easily accumulate on the vehicle chassis and the bottom of the battery during vehicle operation. This dirt may obscure the battery casing, causing visual inspection deviations during testing and reducing the accuracy of the battery testing equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a battery testing device for battery swapping stations to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a battery testing device for a battery swapping station, comprising a main body, which includes several roller groups fixedly connected to the inner wall of its bottom. The roller groups are arranged in pairs, equidistant from the main body. The main body has several curved grooves symmetrically distributed around the main body. The device also includes: The cleaning mechanism is installed inside the main body and is used to clean the bottom of the battery under the vehicle. The cleaning mechanism includes a ramp fixedly connected to the side wall of the main body, and a rotating plate rotatably connected to the top of the ramp; The stabilizing mechanism is installed inside the main body and is used to limit and support the battery after it has been removed. The roller assembly consists of four rollers, each corresponding to one of the four car wheels. The rollers are designed to provide sliding conditions during car position correction.

[0005] Furthermore, the main body includes: The positioning component is located inside the main body; The detection component, located at the bottom of the alignment component, is used for visual inspection of the battery.

[0006] Furthermore, cleaning agencies also include: Contact components are located inside the main body; The contact component includes a rubber sheet that is slidably connected inside the main body, with one end of the rubber sheet away from the rotating plate being fixedly connected to the main body; The push component is located on the back of the contact component, and its placement will cause the contact component to swing. The pushing component includes a baffle plate that is slidably connected to the inner wall of the bottom of the main body, and a reset plate is fixedly connected to the bottom of the baffle plate.

[0007] Furthermore, stabilizing institutions include: The control component is located on top of the detection component; The control components include several connecting sleeves located inside the main body.

[0008] Furthermore, the alignment component includes several push plates that are slidably connected inside the main body, with the push plates arranged in pairs and symmetrically distributed around the inclined platform as the center; Each set of push plates has a connecting rod fixedly connected to its side wall; The push plate consists of four plates. The bottom of the push plate is fixedly connected to the interior of the main body, and the top of the push plate must extend beyond the top of the roller assembly.

[0009] Furthermore, the detection component includes a cover plate that is slidably connected inside the main body, and a removal plate is provided at the bottom of the cover plate; The removal plate is slidably connected to the inside of the main body. Several detection cameras are fixedly connected to the top of the removal plate, and the detection cameras are symmetrically distributed around the cover plate. The cover plate slides left and right, the removal plate slides up and down, and there are two detection cameras that inspect the appearance of the battery.

[0010] Furthermore, the contact assembly also includes a triangular block fixedly connected to one end of the rubber sheet near the rotating plate; Several springs are fixedly connected to the bottom of the rotating plate, and the springs are symmetrically distributed around the inclined platform. There are two springs, one of which provides thrust for the rotating plate to reset.

[0011] Furthermore, the actuating component also includes a sliding sleeve that is slidably connected to the side wall of the connecting rod, with the bottom of one end of the sliding sleeve slidably connected to the inside of the bending groove; A rubber strip is fixedly connected to the other end of the sliding sleeve, and the other end of the rubber strip is fixedly connected to another sliding sleeve.

[0012] Furthermore, several worm springs are provided on the back of the reset plate; Several worm springs are equidistantly distributed along the length of the rubber strip, and the top of the worm springs is fixedly connected to the outer surface of the rubber strip.

[0013] Several worm springs provide a certain supporting force for the rubber strip.

[0014] Furthermore, the control assembly also includes a connecting plate that is rotatably connected to the bottom of the connecting sleeve; Each set of connecting plates has a rotatable connection to a stabilizing frame at the end furthest from the connecting sleeve. A guide plate is fixedly connected to the side wall of the connecting sleeve; Several connecting sleeves are slidably connected to the side wall of the connecting rod. Several connecting sleeves are symmetrically distributed in pairs around the cover plate. The guide plate is slidably connected to the bottom inner wall of the main body. When the connecting rod moves relative to the main body, the connecting sleeve will slide inward.

[0015] The present invention has the following beneficial effects: 1. This application designs a battery testing device for a battery swapping station. By setting up a cleaning mechanism, which includes an inclined platform, a rotating plate, and a rubber sheet, the rotating plate is driven by the weight of the car to squeeze the rubber sheet, causing it to come into contact with the car chassis and generate static electricity through friction. This achieves automatic cleaning of the car chassis and the bottom of the battery, reducing the detection deviation caused by dust and dirt in the detection camera, and helping to improve the detection accuracy of the battery testing device.

[0016] 2. The battery testing equipment designed in this application for a battery swapping station includes a pushing component comprising a sliding sleeve, a bending groove, and a rubber strip. When the pushing plate moves, it drives the sliding sleeve to slide along the bending groove and squeezes the rubber strip. After the rubber strip deforms, it pushes the rubber sheet to move synchronously and generates a fan-like breeze, which realizes the blowing and cleaning of residual dust at the bottom of the battery. This helps to reduce the detection deviation caused by dust falling and improve the detection stability.

[0017] 3. The battery testing equipment designed in this application for a battery swapping station includes a control component comprising a connecting sleeve, a connecting plate, and a stabilizing frame. When the connecting rod moves, it causes the connecting sleeve to slide, thereby driving the connecting plate to rotate and the stabilizing frame to rise. This allows the stabilizing frame to form a stable square during battery disassembly and transportation, achieving stable support and limiting of the battery. This helps reduce battery displacement and testing interruptions caused by the movement of the disassembly plate, and improves the continuity of testing.

[0018] 4. The battery testing equipment designed in this application for a battery swapping station has multiple worm springs at the bottom of the rubber strip. The worm springs move with the deformation of the rubber strip and beat the rubber sheet at intervals, causing the rubber sheet to vibrate and knock off the attached dust. This achieves self-cleaning of the rubber sheet, helps to reduce the situation where the rubber strip is twisted and the rubber sheet cannot flap, and improves the continuity and integrity of the equipment operation.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged diagram of A in the middle; Figure 4 This is a schematic diagram of the contact component of the present invention; Figure 5 This is a partial schematic diagram of the contact component of the present invention; Figure 6 This is a schematic diagram of the driving component of the present invention; Figure 7 For the present invention Figure 6 Enlarged diagram of B in the diagram; Figure 8 This is a schematic diagram of the control component of the present invention; Figure 9 For the present invention Figure 8 An enlarged diagram of C in the diagram.

[0022] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 11. Alignment assembly; 111. Roller assembly; 112. Push plate; 113. Connecting rod; 12. Detection assembly; 121. Cover plate; 122. Removal plate; 123. Detection camera; 201. Inclined platform; 2. Cleaning mechanism; 21. Contact assembly; 211. Rotating plate; 212. Rubber sheet; 213. Triangular block; 214. Spring; 22. Push assembly; 221. Sliding sleeve; 222. Bending groove; 223. Rubber strip; 224. Blocking plate; 225. Reset plate; 226. Worm spring; 3. Stabilizing mechanism; 31. Control assembly; 311. Connecting sleeve; 312. Connecting plate; 313. Stabilizing frame; 314. Guide plate. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1 - Figure 9 As shown, the present invention is a battery testing device for a battery swapping station, comprising a main body 1, which includes a plurality of roller groups 111 fixedly connected to the inner wall of the bottom, the roller groups 111 being arranged in pairs and equidistantly around the main body 1, and a plurality of bending grooves 222 being provided inside the main body 1, the bending grooves 222 being symmetrically distributed around the main body 1 as the center, and further comprising: Cleaning mechanism 2 is installed inside the main body 1 and is used to clean the bottom of the battery under the vehicle. The cleaning mechanism 2 includes an inclined platform 201 fixedly connected to the side wall of the main body 1, and a rotating plate 211 rotatably connected to the top of the inclined platform 201; The stabilizing mechanism 3 is installed inside the main body 1 and is used to limit and support the battery after it is removed. The roller group 111 consists of four rollers, each corresponding to one of the four car wheels. The roller group 111 is configured to provide sliding conditions during car position correction.

[0025] Entity 1 includes: The positioning component 11 is disposed inside the main body 1; The detection component 12 is located at the bottom of the alignment component 11 and is used to perform visual inspection on the battery.

[0026] Cleaning facility 2 also includes: Contact component 21 is disposed inside the main body 1; The contact component 21 includes a rubber sheet 212 that is slidably connected inside the main body 1, and one end of the rubber sheet 212 away from the rotating plate 211 is fixedly connected to the main body 1. Push component 22 is located on the back of contact component 21. The placement of push component 22 will cause contact component 21 to swing. The pushing component 22 includes a baffle plate 224 that is slidably connected to the inner wall of the bottom of the main body 1, and a reset plate 225 is fixedly connected to the bottom of the baffle plate 224.

[0027] Stabilizing agency 3 includes: Control component 31 is disposed on top of detection component 12; The control component 31 also includes several connecting sleeves 311 disposed inside the main body 1.

[0028] The alignment component 11 includes several push plates 112 that are slidably connected inside the main body 1. The push plates 112 are arranged in pairs and symmetrically distributed with the inclined platform 201 as the center. Each push plate 112 has a connecting rod 113 fixedly connected to its side wall; There are four push plates 112. The bottom of the push plate 112 is fixedly connected to the inside of the main body 1. The top of the push plate 112 must pass over the top of the roller group 111. First, the staff drives the electric car from the inclined platform 201 into the inside of the main body 1 and moves to the top of the cover plate 121. After moving to the designated position, the staff needs to turn off the car and then the battery swapping station starts working.

[0029] The detection component 12 includes a cover plate 121 that is slidably connected inside the main body 1, and a removal plate 122 is provided at the bottom of the cover plate 121; The removal plate 122 is slidably connected to the inside of the main body 1. Several detection cameras 123 are fixedly connected to the top of the removal plate 122. The several detection cameras 123 are symmetrically distributed around the cover plate 121. Among them, the cover plate 121 slides left and right, the removal plate 122 slides up and down, and there are two detection cameras 123. The detection cameras 123 will detect the appearance of the battery. The push plates 112 on both sides will move towards the center of the cover plate 121 simultaneously. The push plates 112 will contact the tire and fit with the vehicle tire, pushing the vehicle to complete the alignment and correction on the roller group 111.

[0030] The contact assembly 21 also includes a triangular block 213 fixedly connected to one end of the rubber sheet 212 near the rotating plate 211; Several springs 214 are fixedly connected to the bottom of the rotating plate 211, and the springs 214 are symmetrically distributed around the inclined platform 201. There are two springs. The springs provide thrust for the reset of the rotating plate. The rotating plate 211 will rotate downward under the influence of the car's weight. The rotation of the rotating plate 211 will squeeze the triangular block 213 at the bottom. The triangular block 213 will slide towards the cover plate 121 under the squeezing of the rotating plate 211. The triangular block 213 will drive the rubber sheet 212 to move synchronously.

[0031] The push assembly 22 also includes a sliding sleeve that is slidably connected to the side wall of the connecting rod, with the bottom of one end of the sliding sleeve slidably connected to the inside of the bending groove; A rubber strip is fixedly connected to the other end of the sliding sleeve, and the other end of the rubber strip is fixedly connected to another sliding sleeve.

[0032] Several worm springs 226 are provided on the back of the reset plate 225; Several worm springs 226 are equidistantly distributed along the length of the rubber strip 223, and the top of the worm springs 226 is fixedly connected to the outer surface of the rubber strip 223.

[0033] Among them, several worm springs provide a certain support force for the rubber strip. When the sliding sleeve 221 moves, it will swing back and forth due to the setting of the curvature of the bending groove 222. At the same time, when the sliding sleeves 221 approach each other, they will squeeze the rubber strip 223. The rubber strip 223 will deform upward under the influence of the squeezing force. The rubber strip 223 will collide with the blocking plate 224 under the influence of the sliding of the sliding sleeve 221.

[0034] The control assembly 31 also includes a connecting plate 312 that is rotatably connected to the bottom of the connecting sleeve 311; Each set of connecting plates 312 is rotatably connected to a stabilizing frame 313 at the end away from the connecting sleeve 311; A guide plate 314 is fixedly connected to the side wall of the connecting sleeve 311; Among them, several connecting sleeves 311 are slidably connected to the side wall of the connecting rod 113. Several connecting sleeves 311 are symmetrically distributed in pairs around the cover plate 121. The guide plate is slidably connected to the bottom inner wall of the main body. When the connecting rod moves relative to each other, the connecting sleeve will slide inward. The pushing plate 112 will drive the connecting sleeve 311 to move through the connecting rod 113. When the connecting sleeve 311 moves, it will slide towards the center of the dismantling plate 122 under the influence of the guide plate 314. At the same time, the mutual approach of two connecting sleeves 311 will cause the two connecting plates 312 to approach each other.

[0035] In operation, staff first drive an electric vehicle from the ramp 201 into the interior of the main body 1 and move it to the top of the cover plate 121. Once in the designated position, the staff need to turn off the vehicle. Then, the battery swapping station begins operation. The cover plate 121 slides to the left, exposing the removal plate 122. At the same time, the push plates 112 on both sides move towards the center of the cover plate 121. The push plates 112 contact the tires and fit against them, pushing the vehicle onto the roller assembly 111 for alignment. After the removal plate 122 is fully exposed, the detection camera 123 scans the battery area to perform an external inspection of the battery. Once the battery is deemed to be in good condition, the removal plate 122 rises and removes the battery. After the battery is separated from the vehicle, the removal plate 122 connects to the detection circuit to collect internal electrical performance data of the battery and transports the battery into the main body 1 for replacement. The replaced battery is then installed at the bottom of the vehicle, thus completing the battery swapping and testing.

[0036] When a car drives over the ramp 201, the rotating plate 211 rotates downwards under the weight of the car. This rotation compresses the triangular block 213 at the bottom, causing it to slide towards the cover plate 121. The triangular block 213 then drives the rubber sheet 212 to move synchronously. The end of the rubber sheet 212 near the cover plate 121 deforms upwards until it contacts the car chassis. When the car passes over the protruding rubber sheet 212, the rubber sheet 212 will... When the rubber sheet 212 comes into contact with the car chassis, it will rub against the chassis and generate static electricity to clean the chassis. At the same time, the protruding rubber sheet 212 will shift in the direction of the car's movement to prevent it from being pressed and reset. Due to the rubber sheet 212, the presence of dust and dirt on the bottom of the battery can reduce the deviation in the detection of the detection camera 123 when it performs visual inspection of the battery, thus further improving the accuracy of the battery detection equipment at the battery swapping station.

[0037] When the push plate 112 moves toward the center of the cover plate 121, the push plate 112 will drive the connecting rod 113 to move synchronously, and the connecting rod 113 will drive the sliding sleeve 221 to move synchronously. When the sliding sleeve 221 moves, it will swing back and forth due to the curvature of the bending groove 222. At the same time, when the sliding sleeves 221 approach each other, they will squeeze the rubber strip 223. Under the influence of the squeezing force, the rubber strip 223 will deform upward. Under the influence of the sliding of the sliding sleeves 221, the rubber strip 223 will collide with the blocking plate 224. The blocking plate 224 will squeeze the bottom of the rubber strip 223. The top of the rubber strip 223 will move toward the cover plate 121 under the pressure of the bottom. When the direction is rotated, the rotation of the rubber strip 223 will drive the rubber sheet 212 to move synchronously. Due to the limited elastic potential energy of the rubber material of the rubber sheet 212, when the car leaves the rotating plate 211, the rubber sheet 212 will not quickly reset, but will reset slowly. When the rubber strip 223 exerts a pushing force on the rubber sheet 212, the reset of the rubber sheet 212 will stop. At the same time, the continuous fanning of the rubber sheet 212 will generate a breeze, thereby reducing the vibration caused by the car being pushed by the push plate 112, which would cause residual dust at the bottom of the battery to fall off and cause dust to appear on the detection camera 123, resulting in a large detection deviation. This further improves the stability of the battery detection equipment of the battery swapping station.

[0038] When the push plate 112 moves toward the cover plate 121, the push plate 112 will drive the connecting sleeve 311 to move through the connecting rod 113. When the connecting sleeve 311 moves, it will slide toward the center of the dismantling plate 122 under the influence of the guide plate 314. At the same time, the two connecting sleeves 311 will move closer to each other, causing the two connecting plates 312 to move closer to each other. Since the connecting plate 312 is blocked by the stabilizing frame 313 when it moves, the connecting plate 312 will rotate upward under the influence of resistance. At this time, the stabilizing frame 313 will also move upward. The sliding of the connecting sleeves 311 will cause the two stabilizing frames 313 to move closer to each other. When the dismantling plate 122 finishes disassembling the battery and transports it, the battery will first enter the square frame formed by the stabilizing frames 313. This reduces the situation where the battery is offset due to the up and down movement of the dismantling plate 122 when it is testing the battery, which would cause the dismantling plate 122 to interrupt the testing. This further improves the continuity of the battery testing equipment in the battery swapping station.

[0039] When the rubber strip 223 deforms and bulges upward, its movement drives the lower worm spring 226 to move as well. The coiled part of the worm spring 226 rotates and tightens. Since there are multiple worm springs 226, the overlapping of the rubber strip 223 during deformation reduces the possibility of reduced rotational capacity. Furthermore, the worm spring 226 has a flat structure, so when the rubber strip 223 contacts the rubber sheet 212, the worm spring 226 also contacts the rubber sheet 212. This contact creates intermittent tapping, causing the rubber sheet 212 to vibrate and dislodge dust. The worm spring 226 also reduces the possibility of the rubber sheet 212 failing to flap due to the twisting of the rubber strip 223, further improving the continuity and integrity of the battery testing equipment operation at the battery swapping station.

[0040] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A battery testing device for a battery swapping station, comprising a main body (1), wherein the main body (1) includes a plurality of roller groups (111) fixedly connected to the inner wall of the bottom, the plurality of roller groups (111) being arranged in pairs and equidistantly distributed around the main body (1), and the main body (1) having a plurality of curved grooves (222) inside, the plurality of curved grooves (222) being symmetrically distributed around the main body (1) as the center, characterized in that, Also includes: Cleaning mechanism (2), which is installed inside the main body (1), is used to clean the bottom of the battery under the vehicle; The cleaning mechanism (2) includes a ramp (201) fixedly connected to the side wall of the main body (1), and a rotating plate (211) is rotatably connected to the top of the ramp (201). A stabilizing mechanism (3) is installed inside the main body (1) and is used to limit and support the battery after it is removed.

2. The battery testing equipment for a battery swapping station according to claim 1, characterized in that: The main body (1) includes: The orthopedic assembly (11) is disposed inside the main body (1); The detection component (12) is disposed at the bottom of the alignment component (11) and is used to perform appearance inspection on the battery.

3. The battery testing equipment for a battery swapping station according to claim 2, characterized in that: The cleaning mechanism (2) also includes: Contact component (21), the contact component (21) being disposed inside the main body (1); The contact assembly (21) includes a rubber sheet (212) slidably connected inside the body (1), with one end of the rubber sheet (212) away from the rotating plate (211) fixedly connected to the body (1); A pushing component (22) is disposed on the back side of the contact component (21), and the placement of the pushing component (22) will push the contact component (21) to swing. The pushing component (22) includes a baffle plate (224) slidably connected to the bottom inner wall of the main body (1), and a reset plate (225) is fixedly connected to the bottom of the baffle plate (224).

4. A battery testing device for a battery swapping station according to claim 3, characterized in that: The stabilizing mechanism (3) includes: A control component (31) is disposed on top of the detection component (12); The control component (31) includes several connecting sleeves (311) disposed inside the main body (1).

5. A battery testing device for a battery swapping station according to claim 4, characterized in that: The alignment component (11) includes several push plates (112) slidably connected inside the main body (1). The push plates (112) are arranged in pairs and symmetrically distributed with the inclined platform (201) as the center. Each push plate (112) is fixedly connected to a connecting rod (113) on its side wall.

6. A battery testing device for a battery swapping station according to claim 5, characterized in that: The detection component (12) includes a cover plate (121) slidably connected inside the main body (1), and a removal plate (122) is provided at the bottom of the cover plate (121). The removal plate (122) is slidably connected to the inside of the main body (1). Several detection cameras (123) are fixedly connected to the top of the removal plate (122). The several detection cameras (123) are symmetrically distributed around the cover plate (121).

7. A battery testing device for a battery swapping station according to claim 6, characterized in that: The contact assembly (21) also includes a triangular block (213) fixedly connected to one end of the rubber sheet (212) near the rotating plate (211). The bottom of the rotating plate (211) is fixedly connected to several springs (214), and the several springs (214) are symmetrically distributed around the inclined platform (201).

8. A battery testing device for a battery swapping station according to claim 5, characterized in that: The pushing assembly (22) also includes a sliding sleeve (221) slidably connected to the side wall of the connecting rod (113), and the bottom of one end of the sliding sleeve (221) is slidably connected to the inside of the bending groove (222); A rubber strip (223) is fixedly connected to the other end of the sliding sleeve (221), and the other end of the rubber strip (223) is fixedly connected to another sliding sleeve (221).

9. A battery testing device for a battery swapping station according to claim 8, characterized in that: The back of the reset plate (225) is provided with a plurality of worm springs (226). Several of the aforementioned worm springs (226) are equidistantly distributed along the length of the rubber strip (223), and the top of the worm springs (226) is fixedly connected to the outer surface of the rubber strip (223).

10. A battery testing device for a battery swapping station according to claim 6, characterized in that: The control assembly (31) also includes a connecting plate (312) rotatably connected to the bottom of the connecting sleeve (311). Each set of connecting plates (312) has a rotatable frame (313) at the end away from the connecting sleeve (311); The side wall of the connecting sleeve (311) is fixedly connected to a guide plate (314). Among them, several connecting sleeves (311) are slidably connected to the side wall of the connecting rod (113), and the several connecting sleeves (311) are symmetrically distributed in pairs around the cover plate (121).

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