Precise curb placing mechanism

Abstract

The application provides a curb precise placing mechanism and relates to the technical field of curb laying. The curb precise placing mechanism comprises a machine base and a machine frame arranged above the machine base. The inner wall of the machine frame is provided with a driving assembly. The lower surface of the driving assembly is fixedly connected with a first connecting plate. The inside of the first connecting plate is provided with a fine adjustment assembly. The lower surface of the fine adjustment assembly is fixedly connected with a T-shaped mounting bracket. The two ends of the T-shaped mounting bracket are provided with clamping assemblies. When the curb is clamped by the clamping assemblies and faces the direction of the supporting assembly through the rotation of the machine frame, the data obtained by the two infrared distance sensors and whether the ray emitted by the comparison laser pen is on the center line of the calibration plate in the supporting assembly are compared to solve the problem of precise placement of the curb. Workers do not need to position through naked eye observation, and the error of human factors is reduced.

Description

Technical Field

[0001] This invention relates to the field of curbstone laying technology, specifically a curbstone precise placement mechanism. Background Technology

[0002] Curbstones are marker stones and boundary stones placed between the road surface and other structures. Curbstones are generally required between the median strip and the road surface, and between the sidewalk and the road surface in urban roads. Curbstones are also often required at the edge of the central median strip, the right edge of the driving lane, or the outer edge of the shoulder of highways to restrict vehicles from traveling in designated lanes, so as to separate pedestrians and vehicles, guide the line of sight, and ensure the neatness of the road surface edges.

[0003] Curbstones are typically constructed from large, heavy blocks. These blocks are unloaded and placed in designated locations. Then, a small forklift equipped with a placement mechanism is used, with a curbstone paving machine mounted on one side of the forklift, to facilitate road construction. During the transfer of the curbstone to the paving machine, the placement mechanism rotates from the direction of the curbstone stack (facing the forklift) to the support component. The angle of this rotation is visually observable by workers. This rotation can easily lead to misalignment and the curbstone not being centered on the support component. Consequently, when transferred to the paving machine, it may still be misaligned, requiring manual correction by workers. Otherwise, the curbstone may not be able to be placed side-by-side with adjacent curbstones when it falls. This entire process significantly disrupts and reduces the efficiency of curbstone paving.

[0004] To address this, we have developed a new type of precise curbstone placement mechanism. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a precise curbstone placement mechanism, which solves the problem that existing forklift placement mechanisms are prone to misalignment and misalignment of curbstones during the transfer process, greatly interfering with and reducing the efficiency of curbstone paving.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a curbstone precise placement mechanism, comprising a base and a frame disposed above the base, wherein a mounting box is fixedly connected to the upper surface of the base, a worm gear is rotatably connected to the inner wall of the mounting box, and the upper surface of the worm gear is fixedly connected to the lower surface of the frame, a plurality of mounting holes are symmetrically opened on the outer surface of the frame, and a drive assembly is installed on the inner wall of the frame, a first connecting plate is fixedly connected to the lower surface of the drive assembly, and a fine-tuning component is installed inside the first connecting plate;

[0009] The lower surface of the fine-tuning component is fixedly connected to a T-shaped mounting bracket, and clamping components are installed at both ends of the T-shaped mounting bracket. A first calibration component that cooperates with the clamping components is installed on the back of the T-shaped mounting bracket, and a second calibration component that cooperates with the clamping components is installed on the front of the frame.

[0010] A third connecting plate is fixedly connected to one side of the outer surface of the base, and a curbstone support component that cooperates with the first calibration component and the second calibration component is fixedly connected to one side of the outer surface of the third connecting plate.

[0011] Preferably, the drive assembly includes a first motor fixedly installed at the bottom of the inner wall of the frame, the output shaft of the first motor is fixedly connected to a first lead screw, the outer surface of the first lead screw is threadedly connected to a slide, the outer surface of the slide is slidably connected to the inner wall of the frame, and a linear motor is fixedly installed inside the slide, the lower surface of the output end of the linear motor is fixedly connected to the upper surface of the first connecting plate.

[0012] Preferably, the fine-tuning component includes a servo motor fixedly installed inside the first connecting plate. The output shaft of the servo motor is fixedly connected to a fixed plate. A second motor is fixedly installed at one end of the upper surface of the fixed plate. The output shaft of the second motor is fixedly connected to a second lead screw. The outer surface of the second lead screw is threadedly connected to the second connecting plate. A sliding plate is fixedly connected to the bottom of one side of the outer surface of the second connecting plate, and the upper surface of the sliding plate is slidably connected to the lower surface of the fixed plate.

[0013] Through the above technical solution, the operation of the servo motor can drive the rotation of the fixed plate, thereby deflecting the clamping component below by a certain angle to prevent the curbstone from tilting when placed. The operation of the second motor can push the slide plate to slide along the fixed plate, thereby displacing the clamping component laterally by a certain distance to prevent the curbstone from tilting when placed.

[0014] Preferably, the clamping assembly includes hydraulic cylinders symmetrically hinged at both ends of the upper surface of the T-shaped mounting bracket, with clamping plates hinged to the piston ends of both hydraulic cylinders, and the inner sides of both clamping plates being hinged to the ends of the T-shaped mounting bracket.

[0015] Through the above technical solution, the extension and retraction of the piston end of the hydraulic cylinder can control the clamping plate to rotate around the end of the T-shaped mounting bracket, thereby controlling whether the curbstone is clamped.

[0016] Preferably, the first calibration component includes a mounting plate fixedly connected to the back of the T-shaped mounting bracket, and a plurality of laser pointers are fixedly mounted on the lower surface of the mounting plate.

[0017] Preferably, the second calibration component includes connecting rods symmetrically fixedly connected to both sides of the outer surface of the carriage, with support plates fixedly connected to the lower surfaces of both connecting rods, and infrared ranging sensors fixedly installed on the front sides of both support plates.

[0018] Through the above technical solution, the first calibration component can compare whether the curbstone is in the center position relative to the curbstone support component, while the second calibration component can compare whether the two ends of the curbstone are on the same horizontal straight line, that is, whether there is any skewing.

[0019] Preferably, the curbstone support assembly includes a U-shaped frame fixedly connected to one side of the outer surface of the third connecting plate. The top of the U-shaped frame is symmetrically hinged with an L-shaped support plate. The opposite sides of the two L-shaped support plates are fixedly connected to a support rod. A calibration plate that cooperates with an infrared ranging sensor is fixedly connected to one side of the outer surface of the support rod. An L-shaped mounting base is fixedly connected to the back of the U-shaped frame. A third motor is fixedly mounted on one side of the outer surface of the L-shaped mounting base, and the output shaft of the third motor is fixedly connected to the lower surface of a single L-shaped support plate.

[0020] By controlling the operation of the third motor, the rotation of the L-shaped support plate around the U-shaped frame can be controlled using the above technical solution.

[0021] Preferably, the connecting rod consists of a limiting rod and a fixed rod that is slidably connected to the bottom of the limiting rod. A spring is fixedly connected to the lower surface of the limiting rod, and one end of the spring is fixedly connected to the bottom of the inner wall of the fixed rod.

[0022] Preferably, a worm is meshed with one side of the outer surface of the worm wheel, and a drive motor connected to the worm is fixedly installed on the rear side of the inner wall of the mounting box.

[0023] The above technical solution enables the drive motor to rotate the worm gear, which in turn drives the worm wheel to rotate, thus causing the entire frame to rotate.

[0024] Preferably, a T-shaped slider is fixedly connected to the upper surface of the skateboard, the T-shaped slider is slidably connected to the bottom of the fixed plate, and the bottom of the fixed plate is provided with a groove that matches the T-shaped slider.

[0025] (III) Beneficial Effects

[0026] This invention provides a mechanism for precisely placing curb stones. It has the following beneficial effects:

[0027] This precise curbstone placement mechanism, through the design of a first calibration component and a second calibration component, allows the curbstone to be positioned at a horizontal angle parallel to the support component by comparing data obtained from two infrared ranging sensors when the curbstone is held by the clamping component and faces the support component through the rotation of the frame. Furthermore, by comparing whether the ray emitted by the laser pointer is on the center line of the calibration plate in the support component, it can be determined whether the curbstone is centered relative to the support component. This solves the problem of precise curbstone placement, eliminating the need for workers to position it by visual inspection, reducing errors caused by human factors, and making it more accurate.

[0028] This precise curbstone placement mechanism, through the design of a fine-tuning component, can activate a servo motor when the curbstone is not parallel to the support component. This motor controls the fixing plate and the clamping component below to deflect the curbstone at a certain angle. Combined with data obtained from an infrared ranging sensor, the mechanism ultimately ensures that the curbstone is parallel to the support component. Conversely, when the curbstone is not in the centered position, a second motor is activated, causing the sliding plate to slide a certain distance along the fixing plate. With the guidance of a laser pointer and a calibration plate, the mechanism ensures that the curbstone is in the centered position relative to the support component. This eliminates the need for manual correction by workers, saving construction time and ensuring efficient curbstone paving. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the mounting box of the present invention;

[0031] Figure 3 This is a front view of the fine-tuning component and clamping component of the present invention;

[0032] Figure 4 This is a side view of the first calibration component and the second calibration component of the present invention;

[0033] Figure 5 This is a schematic diagram of the internal structure of the connecting rod of the present invention;

[0034] Figure 6 This is a perspective view of the skateboard and T-shaped slider of the present invention;

[0035] Figure 7 This is a rear view of the support component of the present invention.

[0036] The components are as follows: 1. Base; 2. Mounting box; 3. Worm gear; 4. Worm wheel; 5. Frame; 6. First motor; 7. First lead screw; 8. Slide; 9. Linear motor; 10. First connecting plate; 11. Servo motor; 12. Fixing plate; 13. Slide plate; 14. Second motor; 15. Second lead screw; 16. Second connecting plate; 17. T-shaped mounting bracket; 18. Hydraulic cylinder; 19. Clamping plate; 20. Connecting rod; 21. Support plate; 22. Infrared ranging sensor; 23. Spring; 24. Third connecting plate; 25. U-shaped frame; 26. L-shaped support plate; 27. Support rod; 28. L-shaped mounting base; 29. ​​Third motor; 30. Calibration plate; 31. Mounting hole; 32. Mounting plate; 33. Laser pointer; 34. T-shaped slider. Detailed Implementation

[0037] 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.

[0038] Example:

[0039] like Figure 1-7 As shown, this embodiment of the invention provides a precise curbstone placement mechanism, including a base 1 and a frame 5 disposed above the base 1. The base 1 is fixedly installed with an external forklift, and the forklift drives the base 1 and thus the entire placement mechanism to move. A mounting box 2 is fixedly connected to the upper surface of the base 1, and a worm gear 4 is rotatably connected to the inner wall of the mounting box 2. The upper surface of the worm gear 4 is fixedly connected to the lower surface of the frame 5. Correspondingly, a worm 3 is meshed with one side of the outer surface of the worm gear 4, and a drive motor connected to the worm 3 is fixedly installed on the rear side of the inner wall of the mounting box 2. A plurality of mounting holes 31 are symmetrically opened on the outer surface of the frame 5. The mounting holes 31 facilitate the suspension of parts, fuel tanks, engines, etc. by bolts or rivets. A drive assembly is installed on the inner wall of the frame 5. A first connecting plate 10 is fixedly connected to the lower surface of the drive assembly, and a fine-tuning assembly is installed inside the first connecting plate 10.

[0040] A T-shaped mounting bracket 17 is fixedly connected to the lower surface of the fine-tuning component. Clamping components are installed at both ends of the T-shaped mounting bracket 17, and a first calibration component that cooperates with the clamping components is installed on the back of the T-shaped mounting bracket 17. A second calibration component that cooperates with the clamping components is installed on the front of the frame 5. A third connecting plate 24 is fixedly connected to one side of the outer surface of the base 1. A curbstone support component that cooperates with the first calibration component and the second calibration component is fixedly connected to one side of the outer surface of the third connecting plate 24.

[0041] like Figure 1 and 3 As shown, the drive assembly includes a first motor 6 fixedly installed at the bottom of the inner wall of the frame 5. The output shaft of the first motor 6 is fixedly connected to a first lead screw 7. A slide 8 is threadedly connected to the outer surface of the first lead screw 7. The outer surface of the slide 8 is slidably connected to the inner wall of the frame 5. A linear motor 9 is fixedly installed inside the slide 8. The lower surface of the output end of the linear motor 9 is fixedly connected to the upper surface of the first connecting plate 10. The operation of the first motor 6 can drive the rotation of the first lead screw 7, thereby driving the slide 8 to slide along the inner wall of the frame 5, realizing the lifting or lowering of the curb after clamping. The operation of the linear motor 9 can move the first connecting plate 10 at its output end closer to or further away from the frame 5, which is convenient for the lateral movement of the curb when clamping at the stacking position and placing at the paving position according to the actual situation.

[0042] like Figure 3 As shown, the fine-tuning component includes a servo motor 11 fixedly installed inside the first connecting plate 10. The output shaft of the servo motor 11 is fixedly connected to a fixed plate 12. A second motor 14 is fixedly installed at one end of the upper surface of the fixed plate 12. The output shaft of the second motor 14 is fixedly connected to a second lead screw 15. A second connecting plate 16 is threadedly connected to the outer surface of the second lead screw 15. A slide plate 13 is fixedly connected to the bottom of one side of the outer surface of the second connecting plate 16. The upper surface of the slide plate 13 is slidably connected to the lower surface of the fixed plate 12. A T-shaped slider 34 is fixedly connected to the upper surface of the slide plate 13. The T-shaped slider 34 is slidably connected to the bottom of the fixed plate 12. The bottom of the fixed plate 12 has a groove that matches the T-shaped slider 34. The presence of the T-shaped slider 34 can prevent the slide plate 13 from sliding off the fixed plate 12 under the action of gravity. The operation of the second motor 14 can drive the rotation of the second lead screw 15, and then drive the slide plate 13 to slide along the fixed plate 12 through the second connecting plate 16.

[0043] like Figure 3 As shown, the clamping assembly includes hydraulic cylinders 18 symmetrically hinged at both ends of the upper surface of the T-shaped mounting bracket 17. The piston ends of the two hydraulic cylinders 18 are each hinged with a clamping plate 19, and the inner sides of the two clamping plates 19 are hinged to the ends of the T-shaped mounting bracket 17. By controlling the extension and retraction of the piston ends of the hydraulic cylinders 18, the clamping plates 19 can be rotated around the ends of the T-shaped mounting bracket 17. When the clamping plates 19 rotate to a certain angle, the two ends of the curb stone can be clamped.

[0044] like Figure 4As shown, the first calibration component includes a mounting plate 32 fixedly connected to the back of the T-shaped mounting bracket 17. The mounting plate 32 is fixedly connected to the center of the back of the T-shaped mounting bracket 17, and a plurality of laser pointers 33 are fixedly mounted on the lower surface of the mounting plate 32. Since the laser pointers 33 are on the center line relative to the T-shaped mounting bracket 17, they are also on the center line of the curbstone held by the clamping components at both ends of the T-shaped mounting bracket 17. After the laser pointers 33 emit rays, they can mark the center line of the curbstone.

[0045] like Figure 3 and 4 As shown, the second calibration component includes connecting rods 20 symmetrically fixedly connected to both sides of the outer surface of the slide 8. Support plates 21 are fixedly connected to the lower surfaces of both connecting rods 20. Infrared ranging sensors 22 are fixedly installed on the front of both support plates 21. The infrared ranging sensor 22 is model TF-Luna, which is a short-range single-point ranging radar based on the ToF principle. With unique optical and electrical design, it can achieve low-cost short-range ranging with a range of 0.2m-8m and ensure excellent ranging performance in complex environments. The infrared ranging sensor 22 can measure the distance between the two ends of the curbstone. The distance to the object calculated after signal processing can be wirelessly transmitted to the corresponding terminal (such as the controller of the entire curbstone laying machine). Its entire operating principle and application are common and mature technologies and control methods in the existing technology, and will not be described in detail here.

[0046] like Figure 5 As shown, the connecting rod 20 consists of a limiting rod and a fixed rod that is slidably connected to the bottom of the limiting rod. A spring 23 is fixedly connected to the lower surface of the limiting rod, and one end of the spring 23 is fixedly connected to the bottom of the inner wall of the fixed rod. When the slide 8 moves downward to drive the clamping assembly to clamp the curbstone, the connecting rod 20 can retract within a certain limit to achieve accommodation and avoid interfering with the clamping assembly's clamping operation on the curbstone.

[0047] like Figure 1 and 7As shown, the curbstone support assembly includes a U-shaped frame 25 fixedly connected to one side of the outer surface of the third connecting plate 24. The top of the U-shaped frame 25 is symmetrically hinged with an L-shaped support plate 26. The opposite sides of the two L-shaped support plates 26 are fixedly connected to a support rod 27. The outer surface of the support rod 27 is fixedly connected to a calibration plate 30 that cooperates with the infrared ranging sensor 22. The calibration plate 30 has a mark printed on the center line of its upper surface to facilitate cooperation with the rays emitted by the laser pointer 33. The back of the U-shaped frame 25 is fixedly connected to an L-shaped mounting base 28. The outer surface of the L-shaped mounting base 28 is fixedly mounted with a third motor 29. The output shaft of the third motor 29 is fixedly connected to the lower surface of a single L-shaped support plate 26. After the curbstone is placed on the L-shaped support plate 26, the third motor 29 can be started to transfer the curbstone to the subsequent curbstone laying machine.

[0048] Working principle: First, the external forklift moves the base 1 to the curbstone stacking position. Then, the first motor 6 is braked, causing the first lead screw 7 to rotate and drive the slide 8 to move downwards. The hydraulic cylinder 18 is activated, and the piston end of the hydraulic cylinder 18 extends, clamping the curbstone through the clamping plate 19. Then, the first motor 6 is braked to control the slide 8 to rise, and the external forklift is controlled to initially move the entire placement mechanism to the curb position. The drive motor is activated, driving the worm gear 3 to rotate, thereby driving the worm wheel 4 and the frame 5 to rotate towards the support component. Then, the data obtained by the two infrared ranging sensors 22 can be compared to determine whether the curbstone is at a horizontal angle parallel to the support component. By comparing whether the ray emitted by the laser pointer 33 is on the center line of the calibration plate 30 in the support component, it can be determined whether the curbstone is in the center position relative to the support component. This solves the problem of precise curbstone placement without requiring workers to observe with the naked eye. Positioning is performed to reduce errors caused by human factors and achieve greater accuracy. When the curbstone is not parallel to the support component, the servo motor 11 can be activated to control the fixing plate 12 and the clamping component below to deflect the curbstone by a certain angle. With the data obtained by the infrared ranging sensor 22, the curbstone is finally made parallel to the support component. Correspondingly, when the curbstone is not in the center position, the second motor 14 is activated to drive the slide plate 13 to slide a certain displacement along the fixing plate 12. With the guidance of the laser pointer 33 and the calibration plate 30, the curbstone is made to be in the center position relative to the support component. Then, the operation of the third motor 29 causes the L-shaped support plate 26 of the support component to rotate, transferring the curbstone to the curbstone laying machine. The entire placement process does not require manual correction by workers, which saves construction time, ensures the efficiency of curbstone laying, and improves the installation accuracy and smoothness of the curbstone.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precise curbstone placement mechanism, comprising a base (1) and a frame (5) disposed above the base (1), characterized in that: The upper surface of the base (1) is fixedly connected to the mounting box (2), the inner wall of the mounting box (2) is rotatably connected to the worm gear (4), and the upper surface of the worm gear (4) is fixedly connected to the lower surface of the frame (5). The outer surface of the frame (5) is symmetrically provided with a number of mounting holes (31), and the inner wall of the frame (5) is equipped with a drive assembly. The lower surface of the drive assembly is fixedly connected to the first connecting plate (10), and the interior of the first connecting plate (10) is equipped with a fine-tuning assembly. The lower surface of the fine-tuning component is fixedly connected to a T-shaped mounting bracket (17), and clamping components are installed at both ends of the T-shaped mounting bracket (17). A first calibration component that cooperates with the clamping component is installed on the back of the T-shaped mounting bracket (17), and a second calibration component that cooperates with the clamping component is installed on the front of the frame (5). A third connecting plate (24) is fixedly connected to one side of the outer surface of the base (1), and a curbstone support component that cooperates with the first calibration component and the second calibration component is fixedly connected to one side of the outer surface of the third connecting plate (24).

2. The curbstone precise placement mechanism according to claim 1, characterized in that: The drive assembly includes a first motor (6) fixedly installed at the bottom of the inner wall of the frame (5). The output shaft of the first motor (6) is fixedly connected to a first lead screw (7). The outer surface of the first lead screw (7) is threadedly connected to a slide (8). The outer surface of the slide (8) is slidably connected to the inner wall of the frame (5). A linear motor (9) is fixedly installed inside the slide (8). The lower surface of the output end of the linear motor (9) is fixedly connected to the upper surface of the first connecting plate (10).

3. The curbstone precise placement mechanism according to claim 2, characterized in that: The fine-tuning component includes a servo motor (11) fixedly installed inside the first connecting plate (10). The output shaft of the servo motor (11) is fixedly connected to a fixing plate (12). A second motor (14) is fixedly installed at one end of the upper surface of the fixing plate (12). A second lead screw (15) is fixedly connected to the output shaft of the second motor (14). A second connecting plate (16) is threadedly connected to the outer surface of the second lead screw (15). A sliding plate (13) is fixedly connected to the bottom of one side of the outer surface of the second connecting plate (16), and the upper surface of the sliding plate (13) is slidably connected to the lower surface of the fixing plate (12).

4. The curbstone precise placement mechanism according to claim 3, characterized in that: The clamping assembly includes hydraulic cylinders (18) symmetrically hinged at both ends of the upper surface of the T-shaped mounting bracket (17). The piston ends of the two hydraulic cylinders (18) are hinged with clamping plates (19), and the inner sides of the two clamping plates (19) are hinged to the ends of the T-shaped mounting bracket (17).

5. The curbstone precise placement mechanism according to claim 4, characterized in that: The first calibration component includes a mounting plate (32) fixedly connected to the back of a T-shaped mounting bracket (17), and a plurality of laser pointers (33) are fixedly mounted on the lower surface of the mounting plate (32).

6. The curbstone precise placement mechanism according to claim 5, characterized in that: The second calibration component includes connecting rods (20) symmetrically fixedly connected to both sides of the outer surface of the slide (8). Support plates (21) are fixedly connected to the lower surfaces of the two connecting rods (20), and infrared ranging sensors (22) are fixedly installed on the front sides of the two support plates (21).

7. The curbstone precise placement mechanism according to claim 6, characterized in that: The curb support assembly includes a U-shaped frame (25) fixedly connected to one side of the outer surface of the third connecting plate (24). The top of the U-shaped frame (25) is symmetrically hinged with an L-shaped support plate (26). The opposite sides of the two L-shaped support plates (26) are fixedly connected with a support rod (27). The outer surface of the support rod (27) is fixedly connected with a calibration plate (30) that cooperates with an infrared ranging sensor (22). The back of the U-shaped frame (25) is fixedly connected with an L-shaped mounting base (28). The outer surface of the L-shaped mounting base (28) is fixedly mounted with a third motor (29), and the output shaft of the third motor (29) is fixedly connected to the lower surface of a single L-shaped support plate (26).

8. The curbstone precise placement mechanism according to claim 6, characterized in that: The connecting rod (20) consists of a limiting rod and a fixed rod that is slidably connected to the bottom of the limiting rod. A spring (23) is fixedly connected to the lower surface of the limiting rod, and one end of the spring (23) is fixedly connected to the bottom of the inner wall of the fixed rod.

9. The curbstone precise placement mechanism according to claim 1, characterized in that: The worm gear (4) is meshed with a worm (3) on one side of its outer surface, and a drive motor connected to the worm (3) is fixedly installed on the rear side of the inner wall of the mounting box (2).

10. A precise curbstone placement mechanism according to claim 3, characterized in that: The upper surface of the slide plate (13) is fixedly connected to a T-shaped slider (34), the T-shaped slider (34) is slidably connected to the bottom of the fixed plate (12), and the bottom of the fixed plate (12) is provided with a groove that matches the T-shaped slider (34).

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