Gantry type correcting machine for container

Abstract

The utility model relates to the technical field of container maintenance, in particular to a container gantry type correcting machine which comprises rails, a gantry frame, a smoothing mechanism A and a smoothing mechanism B. The two parallel rails are connected with the same supporting plate, and pulleys sliding in the radial direction of the rails are arranged on the rails. The portal frame comprises two vertical beams and a cross beam, the top ends of the vertical beams on the two sides are connected with the corresponding ends of the cross beam respectively, and the bottom ends of the vertical beams on the two sides are connected with the tackles on the corresponding sides respectively. The two smoothing mechanisms A are connected with the vertical beams on the corresponding sides correspondingly, and each smoothing mechanism A comprises a transverse driving assembly, a telescopic roller assembly A and a distance adjusting assembly A. And the smoothing mechanism B is connected with the bottom surface of the cross beam and comprises a longitudinal driving assembly, a telescopic roller assembly B and a distance adjusting assembly B. Through cooperation of the flattening mechanism A and the flattening mechanism B, the surfaces of containers of different sizes can be rapidly flattened, and the maintenance efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of container repair technology, and in particular to a container gantry straightening machine. Background Technology

[0002] Containers are modular tools used to transport packaged or unpackaged goods and are easy to load, unload, and handle using mechanical equipment. During actual transportation, existing containers may bulge and deform due to the movement of the transport vehicle (such as a ship) and the compression of the contents. This requires repair and correction, which is traditionally done manually, resulting in low efficiency.

[0003] The technical solution disclosed in Chinese Patent No. CN111822547B uses a first hydraulic cylinder to push a piston rod downwards to correct the outward bulging deformation of the container's top plate; a second and third hydraulic cylinder are respectively located on two vertical beams and can move up and down along the vertical beams, and the second and third hydraulic cylinders push piston rods inwards from both sides to correct the outward bulging deformation of the left and right sides of the container; a traveling mechanism is located at the lower end of the vertical beams and can drive the gantry frame body to move longitudinally, thereby completing the compression correction of the outward bulging deformation at any position on the container's top and side plates without moving the container; the outward bulging deformation of the container's side and top plates is corrected by pressing from the outside of the container using hydraulic cylinders.

[0004] However, the device still has shortcomings: it requires correction in one place before correction in another, and the overall surface area of ​​the container is large, making the repair efficiency of the device very low. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a container gantry straightening machine.

[0006] The technical solution of this utility model is: a container gantry straightening machine, including rails, two parallel rails connected to the same support plate, and trolleys that slide along the radial direction of the rails.

[0007] The gantry frame consists of two vertical beams and one horizontal beam. The tops of the two vertical beams are connected to the corresponding ends of the horizontal beam, and the bottoms of the two vertical beams are connected to the corresponding trolleys.

[0008] The smoothing mechanism A consists of two sets of smoothing mechanisms A connected to the vertical beams on the corresponding sides. The smoothing mechanism A includes a lateral drive assembly, a telescopic roller assembly A, and a spacing adjustment assembly A. The length of the telescopic roller assembly A is adjusted by the spacing adjustment assembly A, and the spacing between the two telescopic roller assemblies A is adjusted by the lateral drive assembly, so that the two telescopic roller assemblies A on the corresponding sides of the container abut against the side wall. The moving gantry frame drives the telescopic roller assembly A to roll along the surface of the container and smooth the side wall of the container.

[0009] And a smoothing mechanism B, which is connected to the bottom surface of the crossbeam. The smoothing mechanism B includes a longitudinal drive assembly, a telescopic roller assembly B, and a spacing adjustment assembly B. The length of the telescopic roller assembly B is adjusted by the spacing adjustment assembly B, and the telescopic roller assembly B is driven to rise and fall by the longitudinal drive assembly, so that the telescopic roller assembly B abuts against the upper end surface of the container. The moving gantry drives the telescopic roller assembly B to roll along the upper end surface of the container and smooth the upper end surface of the container.

[0010] Preferably, the trolley includes a trolley body, track wheels, and motor A. The trolley body is slidably connected to the track, and multiple sets of track wheels are rotatably connected to the trolley body, with the track wheels abutting against the lower support surface of the track. The motor A is connected to the trolley body, and the output end of the motor A is coaxially connected to the axle of one of the track wheels.

[0011] Preferably, the lateral drive assembly includes a telescopic rod A, a mounting plate A, a hydraulic cylinder A, a slide A, a telescopic rod B, and a mounting plate B. The two ends of the telescopic rod A are respectively connected to the vertical beam on the corresponding side and the mounting plate A. The body of the hydraulic cylinder A is connected to the vertical beam, and the push rod of the hydraulic cylinder A is connected to the mounting plate A on the corresponding side. The mounting plate A is slidably connected to the upper end face of the support plate. The slide A is slidably connected to the vertical beam. The two ends of the telescopic rod B are respectively connected to the slide A and the mounting plate B, and the mounting plate B is parallel to the mounting plate A.

[0012] Preferably, the telescopic roller assembly A includes a rotating roller and a hollow roller. One end of the rotating roller is rotatably connected to the mounting plate A, and the other end is coaxially connected to the column rod A. The hollow roller is sleeved on the column rod A and coaxial with it, and the end of the hollow roller away from the rotating roller is rotatably connected to the mounting plate B. The outer diameter of the hollow roller is the same as the outer diameter of the rotating roller.

[0013] Preferably, the spacing adjustment component A includes a linear module, which is connected to the vertical beam, and the output end of the linear module is connected to the corresponding slide A.

[0014] Preferably, the longitudinal drive assembly includes a slide block B, a telescopic rod C, a mounting plate C, and a hydraulic cylinder C. Two slide blocks B are symmetrically arranged about the center of the crossbeam at the bottom of the crossbeam, and the slide blocks B are slidably connected to the crossbeam. The two ends of the telescopic rod C are respectively connected to the corresponding slide block B and the mounting plate C. The body of the hydraulic cylinder C is connected to the corresponding slide block B, and the output end of the hydraulic cylinder C is connected to the corresponding mounting plate C.

[0015] Preferably, the telescopic roller assembly B includes a pressure roller and a column rod B. One end of the column rod B is coaxially connected to one of the pressure rollers, and the other end of the column rod B is inserted into and coaxial with the pressure roller on the other side. The ends of the two pressure rollers that are far apart from each other are rotatably connected to the mounting plate C on the corresponding side.

[0016] Preferably, the spacing adjustment component B includes a bidirectional module, the body of which is connected to the crossbeam, and the two output ends of which are respectively connected to the corresponding slide B.

[0017] Preferably, two symmetrical sliding grooves are arranged on the support plate, and a storage groove with a side opening communicating with the corresponding sliding groove is provided on the side of the support plate where the two sliding grooves are far apart. A set of limiting mechanisms is provided in each of the two storage grooves.

[0018] Preferably, the limiting mechanism includes a slider, a lead screw, a motor B, a wedge-shaped locking block, and a spring. The slider is located in the receiving groove and is slidably connected to both the receiving groove and the inner wall of the sliding groove. A limiting plate is provided in the sliding groove to restrict the slider to slide only in a straight line. The lead screw is rotatably connected to the support plate, parallel to the limiting plate, and passes through the slider and is helically connected to it. The body of the motor B is connected to the support plate, and the output end of the motor B is coaxially connected to the lead screw. A vertical groove is provided in the slider, and a movable plate is slidably connected to its inner wall in the vertical groove. A sliding rod is provided in the vertical groove along its height direction, passing through the movable plate and slidably connected to it. One end of the wedge-shaped locking block is inserted into the vertical groove and connected to the movable plate, and the inclined surfaces of the two wedge-shaped locking blocks face away from each other. The spring is sleeved on the sliding rod, and both ends of the spring abut against the lower wall of the vertical groove and the lower surface of the movable plate, respectively.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] By setting up a smoothing mechanism A consisting of a lateral drive assembly, a telescopic roller assembly A, and a spacing adjustment assembly A, the telescopic roller assemblies A, which move close together on both sides, position the container in the center of the width direction of the support plate. Then, the telescopic roller assemblies A, which move with the gantry 4, roll and smooth the sides of the container without stopping to change positions. After smoothing the main side, the length of the telescopic roller assembly A is retracted so that it smooths the unsmoothed parts during the return process. By setting up a smoothing mechanism B consisting of a longitudinal drive assembly, a telescopic roller assembly B, and a spacing adjustment assembly B, the telescopic roller assembly B, in its extended state, first smooths the two sides of the upper surface of the container. Then, by retracting the telescopic roller assembly B, it moves closer together with the gantry during the return process and smooths the unsmoothed parts of the upper surface of the container. The repair efficiency is very high. At the same time, this utility model also sets up a limiting mechanism on the support plate to effectively prevent the container from sliding along the surface of the support plate during the smoothing process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0022] Figure 2 A schematic diagram of the connection structure of the various components on the gantry frame;

[0023] Figure 3 This is a schematic diagram of the smoothing mechanism A;

[0024] Figure 4 A schematic diagram of the smoothing mechanism B;

[0025] Figure 5 This is a schematic diagram of the connection structure between the support plate and the limiting mechanism;

[0026] Figure 6 This is a schematic diagram of the limiting mechanism.

[0027] Reference numerals: 1. Track; 2. Support plate; 201. Slide groove; 202. Storage slot; 3. Trolley; 31. Trolley body; 32. Track wheel; 33. Motor A; 4. Gantry frame; 41. Vertical beam; 42. Horizontal beam; 5. Ladder; 6. Smoothing mechanism A; 61. Telescopic rod A; 611. Mounting plate A; 612. Roller A; 613. Rotary roller; 614. Column A; 615. Hydraulic cylinder A; 62. Slide A; 621. Linear module; 622. Telescopic 623. Rod B; 624. Mounting plate B; 625. Roller B; 626. Hollow roller; 627. Hydraulic cylinder B; 78. Smoothing mechanism B; 79. Slide block B; 70. Bidirectional module; 71. Telescopic rod C; 72. Mounting plate C; 73. Roller C; 74. Pressure roller; 75. Column rod B; 76. Hydraulic cylinder C; 8. Slider; 87. Vertical groove; 9. Lead screw; 10. Motor B; 11. Limiting plate; 12. Movable plate; 13. Wedge-shaped block; 14. Slide rod; 15. Spring. Detailed Implementation

[0028] Example 1

[0029] As shown in the figure, this utility model proposes a container gantry straightening machine, including a track 1, a gantry frame 4, a smoothing mechanism A6, and a smoothing mechanism B7. Two parallel tracks 1 are connected to the same support plate 2, and trolleys 3 are installed on the tracks 1, sliding radially along them. The trolley 3 includes a trolley body 31, track wheels 32, and a motor A33. The trolley body 31 is slidably connected to the track 1, and multiple sets of track wheels 32 are rotatably connected to the trolley body 31, with the track wheels 32 abutting against the lower support surface of the track. The motor A33 is connected to the trolley body 31, and the output end of the motor A33 is coaxially connected to the axle of one of the track wheels 32. The gantry frame 4 includes two vertical beams 41 and one horizontal beam 42. The top ends of the two vertical beams 41 are respectively connected to the corresponding ends of the horizontal beam 42, and the bottom ends of the two vertical beams 41 are respectively connected to the corresponding trolleys 3. Two smoothing mechanisms A6 are connected to the vertical beams 41 on the corresponding sides, respectively. The smoothing mechanism A6 includes a lateral drive assembly, a telescopic roller assembly A, and a spacing adjustment assembly A. The lateral drive assembly includes a telescopic rod A61, a mounting plate A611, a hydraulic cylinder A615, a slide block A62, a telescopic rod B622, and a mounting plate B623. The two ends of the telescopic rod A61 are connected to the vertical beam 41 and the mounting plate A611 on the corresponding sides, respectively. The body of the hydraulic cylinder A615 is connected to the vertical beam 41, and the push rod of the hydraulic cylinder A615 is connected to the mounting plate A611 on the corresponding side. The mounting plate A611 is slidably connected to the upper surface of the support plate 2. The slide block A62 is slidably connected to the vertical beam 41. The two ends of the telescopic rod B622 are connected to the slide block A62 and the mounting plate B623 on the corresponding sides, respectively. The mounting plate B623 is parallel to the mounting plate A611. The telescopic roller assembly A includes a rotating roller 613 and a hollow roller 625. One end of the rotating roller 613 is rotatably connected to the mounting plate A611, and the other end is coaxially connected to the column rod A614. The hollow roller 625 is sleeved on the column rod A614 and coaxial with it. The end of the hollow roller 625 away from the rotating roller 613 is rotatably connected to the mounting plate B623. The outer diameter of the hollow roller 625 is the same as the outer diameter of the rotating roller 613. The spacing adjustment assembly A includes a linear module 621, which is connected to the vertical beam 41. The output end of the linear module 621 is connected to the corresponding side slide A62. The length of the telescopic roller assembly A is adjusted by the spacing adjustment component A, and the spacing between the two telescopic roller assemblies A is adjusted by the lateral drive assembly, so that the two telescopic roller assemblies A abut against the corresponding side walls of the container. The moving gantry 4 drives the telescopic roller assemblies A to roll along the surface of the container and smooth the side walls of the container. Rollers A612 are mounted on mounting plate A611, and rollers B624 are mounted on mounting plate B623. The spacing between rollers A612 and B624 on both sides is the same as the spacing between the rotating rollers 613 on both sides. The smoothing mechanism B7 is connected to the bottom surface of the crossbeam 42. The smoothing mechanism B7 includes a longitudinal drive assembly, a telescopic roller assembly B, and a spacing adjustment assembly B. The longitudinal drive assembly includes a slide B71, a telescopic rod C73, a mounting plate C74, and a hydraulic cylinder C78.Two slide blocks B71 are symmetrically arranged about the center of the crossbeam 42 at the bottom of the crossbeam 42. The slide blocks B71 are slidably connected to the crossbeam 42. The two ends of the telescopic rod C73 are connected to the corresponding slide block B71 and the mounting plate C74, respectively. The body of the hydraulic cylinder C78 is connected to the corresponding slide block B71, and the output end of the hydraulic cylinder C78 is connected to the corresponding mounting plate C74. The telescopic roller assembly B includes a pressure roller 76 and a column rod B77. One end of the column rod B77 is coaxially connected to one of the pressure rollers 76, and the other end of the column rod B77 is inserted into and coaxial with the pressure roller 76 on the other side. The ends of the two pressure rollers 76 that are far apart from each other are rotatably connected to the corresponding mounting plate C74. The spacing adjustment assembly B includes a bidirectional module 72. The body of the bidirectional module 72 is connected to the crossbeam 42, and the two output ends of the bidirectional module 72 are connected to the corresponding slide blocks B71, respectively. The length of the telescopic roller assembly B is adjusted by the spacing adjustment component B, and the telescopic roller assembly B is driven to rise and fall by the longitudinal drive component, so that the telescopic roller assembly B abuts against the upper end face of the container. The moving gantry 4 drives the telescopic roller assembly B to roll along the upper end face of the container and smooth the upper end face of the container. A roller C75 is provided on the mounting plate C74 and is rotatably connected to it. The distance between the roller C75 and the support plate 2 is the same as the distance between the pressure roller 76 and the support plate 2.

[0030] In this embodiment, the container is placed on the support plate. Based on the container's height, the linear modules 621 on the two vertical beams 41 are activated. The linear modules 621 drive the sliding blocks A62 to slide, making the height of the rollers B on the mounting plate B623 consistent with the height of the container's upper beam. At this time, the bottom of the rotating roller 613 and the top of the hollow roller 625 are at the same height as the upper and lower ends of the container's side panels, respectively. Then, the hydraulic cylinders A615 and B626 on the two vertical beams 41 are activated, causing the rotating rollers 613 and hollow rollers 625 on both sides to abut against the two side panels of the container. Simultaneously, the bidirectional module 72 is activated, driving the sliding blocks B71 on both sides to move synchronously until the rollers C75 on the mounting plates C74 on both sides are in contact with the container. The upper beams on both sides are of equal width. Then, the hydraulic cylinder C78 is activated to press down the pressure roller 76 so that it abuts against the upper end face of the container. Next, the motor A33 is activated, and the motor A33 drives the gantry 4 to slide, so that each roller rolls on the corresponding end face of the container and smooths the surface of the container. At this time, the part of the container side panel between the rotating roller 613 and the hollow roller 625 has not been smoothed, and the part of the upper end face of the container between the two pressure rollers 76 has not been smoothed either. After the gantry 4 moves to the rear of the container and disengages from it, the distance between the rotating roller 613 and the hollow roller 625 is reduced to bring them closer together, and the distance between the two pressure rollers 76 is reduced to bring them closer together. The gantry 4 slides back to its original position, thereby smoothing the parts that have not been smoothed in the previous step.

[0031] Example 2

[0032] like Figure 5 and Figure 6 As shown, the container gantry straightening machine proposed in this utility model, compared with Embodiment 1, has two symmetrically arranged sliding grooves 201 on the support plate 2, and a receiving groove 202 with a side opening communicating with the corresponding sliding groove 201 on the side of the two sliding grooves 201 that are far apart from each other. A set of limiting mechanisms is arranged in the receiving grooves 202 on both sides. The limiting mechanism includes a slider 8, a lead screw 9, a motor B10, a wedge-shaped locking block 13, and a spring 15. The slider 8 is located in the receiving groove 202 and is slidably connected to both the receiving groove 202 and the inner wall of the sliding groove 201. A limiting plate 11 is provided in the sliding groove 201 to restrict the slider 8 to slide only in a straight line. The lead screw 9 is rotatably connected to the support plate 2, parallel to the limiting plate 11, and passes through the slider 8 and is helically connected to it. The body of the motor B10 is connected to the support plate 2, and the output end of the motor B10 is coaxially connected to the lead screw 9. A vertical groove 81 is provided inside the slider 8, and a movable plate 12 is slidably connected to its inner wall inside the vertical groove 81. A slide rod 14 is provided along the height direction inside the vertical groove 81, passing through the movable plate 12 and slidably connected to it. One end of a wedge-shaped locking block 13 is inserted into the vertical groove 81 and connected to the movable plate 12, and the inclined surfaces of the two wedge-shaped locking blocks 13 are opposite to each other. A spring 15 is sleeved on the slide rod 14, and the two ends of the spring 15 abut against the lower wall of the vertical groove 81 and the lower surface of the movable plate 12, respectively.

[0033] In this embodiment, the container is placed on the support plate 2 and kept between the two sliding grooves 201. Then, the container is pushed to the center of the width direction of the support plate 2 by the telescopic roller assembly A on both sides. At this time, the two sets of motors B10 are started. The motors B10 drive the sliders 8 on both sides to move closer to each other. At this time, the wedge-shaped locking block 13 automatically pops out along the upper opening of the sliding groove 201 after it is disengaged from the receiving groove 202. As the slider 8 continues to move closer, the wedge-shaped locking blocks 13 on both sides abut and limit the two ends of the container, so as to prevent the container from sliding when the surface of the container is smoothed by the telescopic roller assembly A and the telescopic roller assembly B.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A container gantry straightening machine, characterized in that, include Track (1), two parallel tracks (1) are connected to the same support plate (2), and a trolley (3) is provided on the track (1) to slide along its radial direction; The gantry (4) includes two vertical beams (41) and one horizontal beam (42). The tops of the two vertical beams (41) are connected to the corresponding ends of the horizontal beam (42), and the bottoms of the two vertical beams (41) are connected to the corresponding trolleys (3). Smoothing mechanism A (6), two sets of smoothing mechanisms A (6) are respectively connected to the vertical beam (41) on the corresponding side. Smoothing mechanism A (6) includes a transverse drive assembly, a telescopic roller assembly A and a spacing adjustment assembly A. The length of the telescopic roller assembly A is adjusted by the spacing adjustment component A, and the spacing of the two telescopic roller assemblies A on both sides is adjusted by the transverse drive assembly, so that the two telescopic roller assemblies A on both sides abut against the side wall of the corresponding side of the container, and the telescopic roller assembly A is driven to roll along the surface of the container and smooth the side wall of the container by the moving gantry (4). And a smoothing mechanism B (7), which is connected to the bottom surface of the crossbeam (42). The smoothing mechanism B (7) includes a longitudinal drive assembly, a telescopic roller assembly B and a spacing adjustment assembly B. The length of the telescopic roller assembly B is adjusted by the spacing adjustment assembly B, and the telescopic roller assembly B is driven to rise and fall by the longitudinal drive assembly, so that the telescopic roller assembly B abuts against the upper end surface of the container. The telescopic roller assembly B is driven to roll along the upper end surface of the container by the moving gantry (4) and smooth the upper end surface of the container.

2. The container gantry straightening machine according to claim 1, characterized in that, The trolley (3) includes a trolley body (31), track wheels (32) and motor A (33); the trolley body (31) is slidably connected to the track (1), and multiple sets of track wheels (32) are rotatably connected to the trolley body (31), with the track wheels (32) abutting against the lower support surface of the track; the body of motor A (33) is connected to the trolley body (31), and the output end of motor A (33) is coaxially connected to the wheel axle of one of the track wheels (32).

3. A container gantry straightening machine according to claim 1, characterized in that, The lateral drive assembly includes a telescopic rod A (61), a mounting plate A (611), a hydraulic cylinder A (615), a slide A (62), a telescopic rod B (622), and a mounting plate B (623). The two ends of the telescopic rod A (61) are respectively connected to the vertical beam (41) on the corresponding side and the mounting plate A (611). The body of the hydraulic cylinder A (615) is connected to the vertical beam (41), and the push rod of the hydraulic cylinder A (615) is connected to the mounting plate A (611) on the corresponding side. The mounting plate A (611) is slidably connected to the upper end face of the support plate (2). The slide A (62) is slidably connected to the vertical beam (41). The two ends of the telescopic rod B (622) are respectively connected to the slide A (62) and the mounting plate B (623). The mounting plate B (623) is parallel to the mounting plate A (611).

4. A container gantry straightening machine according to claim 3, characterized in that, The telescopic roller assembly A includes a rotating roller (613) and a hollow roller (625). One end of the rotating roller (613) is rotatably connected to the mounting plate A (611), and the other end is coaxially connected to the column rod A (614). The hollow roller (625) is sleeved on the column rod A (614) and coaxial with it. The end of the hollow roller (625) away from the rotating roller (613) is rotatably connected to the mounting plate B (623). The outer diameter of the hollow roller (625) is the same as the outer diameter of the rotating roller (613).

5. A container gantry straightening machine according to claim 3, characterized in that, The spacing adjustment component A includes a linear module (621), which is connected to the vertical beam (41). The output end of the linear module (621) is connected to the corresponding slide A (62).

6. A container gantry straightening machine according to claim 1, characterized in that, The longitudinal drive assembly includes a slide block B (71), a telescopic rod C (73), a mounting plate C (74), and a hydraulic cylinder C (78). The two slide blocks B (71) are symmetrically arranged about the center of the crossbeam (42) at the bottom of the crossbeam (42). The slide blocks B (71) are slidably connected to the crossbeam (42). The two ends of the telescopic rod C (73) are respectively connected to the slide block B (71) on the corresponding side and the mounting plate C (74). The body of the hydraulic cylinder C (78) is connected to the slide block B (71) on the corresponding side, and the output end of the hydraulic cylinder C (78) is connected to the mounting plate C (74) on the corresponding side.

7. A container gantry straightening machine according to claim 6, characterized in that, The telescopic roller assembly B includes a pressure roller (76) and a rod B (77). One end of the rod B (77) is coaxially connected to one of the pressure rollers (76), and the other end of the rod B (77) is inserted into the pressure roller (76) on the other side and coaxial with it. The ends of the two pressure rollers (76) that are far apart from each other are rotatably connected to the mounting plate C (74) on the corresponding side.

8. A container gantry straightening machine according to claim 6, characterized in that, The spacing adjustment component B includes a bidirectional module (72), the body of which is connected to the crossbeam (42), and the two output ends of the bidirectional module (72) are respectively connected to the corresponding slide B (71).

9. A container gantry straightening machine according to claim 1, characterized in that, Two sliding grooves (201) are symmetrically arranged on the support plate (2), and a storage groove (202) with a side opening connected to the corresponding sliding groove (201) is provided on the side of the two sliding grooves (201) that are far apart from each other; a set of limiting mechanisms is provided in the storage grooves (202) on both sides respectively.

10. A container gantry straightening machine according to claim 9, characterized in that, The limiting mechanism includes a slider (8), a lead screw (9), a motor B (10), a wedge-shaped locking block (13), and a spring (15); the slider (8) is located in the receiving groove (202) and is slidably connected to the inner walls of both the receiving groove (202) and the slide groove (201); a limiting plate (11) is provided in the slide groove (201) to restrict the slider (8) to slide only along a straight line; the lead screw (9) is rotatably connected to the support plate (2), the lead screw (9) is parallel to the limiting plate (11), and the lead screw (9) passes through the slider (8) and is helically connected to it; the body of the motor B (10) is connected to the support plate (2), and the motor B (10)'s... The output end is coaxially connected to the lead screw (9); a vertical groove (81) is provided in the slider (8), and a movable plate (12) is provided in the vertical groove (81) and slidably connected to its inner wall. A slide rod (14) is provided in the vertical groove (81) along its height direction. The slide rod (14) passes through the movable plate (12) and is slidably connected to it; one end of the wedge-shaped block (13) is inserted into the vertical groove (81) and connected to the movable plate (12). The inclined surfaces of the two wedge-shaped blocks (13) are opposite to each other; a spring (15) is sleeved on the slide rod (14), and the two ends of the spring (15) abut against the lower wall of the vertical groove (81) and the lower surface of the movable plate (12) respectively.

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