Roadbed stone digging and cement concrete efficient crushing device

Abstract

The utility model relates to the technical field of efficient crushing devices, and discloses a roadbed stone digging and cement concrete efficient crushing device which comprises a base, the top of the base is fixedly connected with a hollow cylinder, the rear side of the hollow cylinder is fixedly connected with a motor, and the output end of the motor penetrates through the hollow cylinder and is fixedly connected with a rotating shaft. The front end of the rotating shaft penetrates through the hollow cylinder and is fixedly connected with a main hammer, the outer wall of the front end of the hollow cylinder is fixedly connected with a circular ring, the outer wall of the circular ring is fixedly connected with a plurality of U-shaped frames at equal intervals, one side of each U-shaped frame is fixedly connected with an auxiliary hammer, and the outer wall of the hollow cylinder is fixedly connected with a dust collection ring. According to the utility model, the motor is started, the main hammer rotates at a high speed for primary crushing, the circular ring and the U-shaped frame drive the auxiliary hammer to hit materials for the second time, and the dust collection ring is matched with the dust collector to suck and filter dust, so that efficient crushing is realized, and the crushing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of high-efficiency crushing device technology, and in particular to a high-efficiency crushing device for roadbed rock excavation and cement concrete. Background Technology

[0002] Uncrushed excavated stones vary in size and cannot be compacted to the specified density during roadbed filling. After being crushed into stones of appropriate particle size, the particles can better interlock with each other. Under the action of compaction machinery, it is easier to achieve the design-required compaction degree, thereby improving the stability and bearing capacity of the roadbed.

[0003] A search revealed that the Chinese patent announcement number is CN212104289U. This utility model relates to the field of municipal engineering equipment technology, specifically to a high-efficiency and fast municipal highway subgrade soil crushing cart. It includes a lifting device, a support frame, hydraulic push rods, and traveling wheels. The support frame is located below the lifting device, with a lead screw in the middle. A movable frame is located below the lead screw, with sliders symmetrically arranged on both sides of the movable frame. A motor b is located in the middle of the movable frame. Hydraulic push rods are symmetrically arranged on both sides of the support frame, with a support plate below the hydraulic push rods. A push rod is located on the right side of the support plate, with a buffer spring b below the support plate, and traveling wheels below the buffer spring b. This utility model can adapt to municipal highway subgrades of different heights, efficiently and quickly crushing blocky subgrade soil, reducing the labor intensity of workers, shortening the crushing time of the subgrade soil, and accelerating the construction of municipal highways. However, in actual use, the single crushing head crushes stones of relatively uniform size, failing to crush the stones more finely. Larger stones are inconvenient for subsequent use, reducing efficiency. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a high-efficiency crushing device for roadbed rock excavation and cement concrete, which aims to improve the problem that the single crushing head in the existing technology crushes stones of relatively uniform size, cannot crush the stones more finely, and reduces efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency crushing device for roadbed rock excavation and cement concrete, comprising a base, a hollow cylinder fixedly connected to the top of the base, a motor fixedly connected to the rear side of the hollow cylinder, the output end of the motor passing through the hollow cylinder and fixedly connected to a rotating shaft, the front end of the rotating shaft passing through the hollow cylinder and fixedly connected to a main hammer, a ring fixedly connected to the outer wall of the front end of the hollow cylinder, multiple U-shaped frames fixedly connected at equal intervals to the outer wall of the ring, a secondary hammer fixedly connected to one side of each of the multiple U-shaped frames, a dust-collecting ring fixedly connected to the outer wall of the hollow cylinder, multiple dust-collecting ports equally spaced on the front side of the dust-collecting ring, a vacuum cleaner fixedly connected to the top right side of the base, the left side of the vacuum cleaner communicating with the right side of the dust-collecting ring, and an adjustment mechanism provided at the bottom of the base.

[0006] The above technical solution involves: turning on the motor, causing its output end to rotate, and transmitting power through the shaft. Since one end of the shaft is fixed to the motor output end and passes through the hollow cylinder, it drives the main hammer connected to the front end to rotate at high speed for crushing. At the same time, multiple U-shaped frames evenly distributed on the outer wall of the ring, and secondary hammers fixed on one side of the U-shaped frames, strike the material a second time with different trajectories and angles, further improving the crushing effect. During the crushing operation, a large amount of dust is generated. At this time, the dust suction ring on the outer wall of the hollow cylinder plays a role. The dust suction ports evenly opened on the front side of the dust suction ring can suck in the surrounding dusty air. The right side of the dust suction ring is connected to the left side of the vacuum cleaner fixed on the top right side of the base. The vacuum cleaner generates suction to filter the dusty air sucked in by the dust suction ring, thereby effectively reducing dust pollution at the work site.

[0007] As a further description of the above technical solution:

[0008] The adjustment mechanism includes a bracket, the top of which is fixedly connected to the bottom of the base. Hollow columns are fixedly connected to the four corners of the bottom of the bracket. Threaded rods are rotatably connected to the top inner side of each of the hollow columns. Driven bevel gears are fixedly connected to the top outer wall of each of the threaded rods. Rotating rods are rotatably connected to one side of the outer wall of each of the hollow columns. One end of each rotating rod passes through a corresponding hollow column and is fixedly connected to a driving bevel gear. Each driving bevel gear meshes with a corresponding driven bevel gear. Moving columns are threadedly connected to the bottom outer wall of each of the threaded rods.

[0009] Through the above technical solution: when it is necessary to adjust the height of the device, the operator can operate the rotating rod, which will drive the driving bevel gear to rotate. The driving bevel gear meshes with the driven bevel gear. The rotation of the driving bevel gear will drive the driven bevel gear to rotate, thereby causing the threaded rod to rotate inside the hollow column. When the threaded rod rotates, the moving column will move up and down linearly along the threaded rod. By controlling the rotation direction of the rotating rod, the moving column can be raised or lowered. The up and down movement of the moving column will drive the entire device to rise or fall, thereby realizing the adjustment of the device height.

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

[0011] A switch is fixedly connected to the left side of the base, and the switch is electrically connected to the motor.

[0012] With the above technical solution, operators can easily control the motor's operating status and thus the rotation of the main hammer by operating the switch.

[0013] As a further description of the above technical solution:

[0014] A fixing plate is fixedly connected to the rear right side of the outer wall of the hollow cylinder, and a warning sign is fixedly connected to the right side of the fixing plate.

[0015] Through the above technical solution: the fixing plate serves to install and support the warning sign, which is used to convey important safety information to the operator or people in the surrounding area.

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

[0017] A limit ring is fixedly connected to the rear side of the main hammer, and a limit groove is formed on the front side of the hollow cylinder.

[0018] The above technical solution limits and guides the rotation of the main hammer, ensuring its stability and accuracy during rotation and preventing it from wobbling or deviating.

[0019] As a further description of the above technical solution:

[0020] Each of the hollow columns has a sliding groove on its left and right sides, and each of the movable columns has a slider fixedly connected to the top left and right sides of its outer wall. Each slider is slidably connected to the interior of its corresponding sliding groove.

[0021] The above technical solution allows the slider to slide within the groove when the moving column moves up and down linearly under the drive of the threaded rod. This limits and guides the movement of the moving column, ensuring that it can move up and down smoothly and accurately.

[0022] As a further description of the above technical solution:

[0023] Each of the movable columns has a base plate fixedly connected to its bottom, and each of the base plates has a plurality of rubber pads fixedly connected at equal intervals to its bottom.

[0024] Through the above technical solution: the base plate increases the contact area between the moving column and the ground, improves the stability of the device, and makes the device run more smoothly during operation. The rubber pad plays a role in buffering and shock absorption, which can reduce the impact of the vibration generated by the device during operation on the ground.

[0025] As a further description of the above technical solution:

[0026] The outer walls of the multiple movable columns are slidably connected to the interior of the corresponding hollow columns, and the dimensions of the hollow columns and the movable columns are matched.

[0027] The above technical solution ensures the smoothness and stability of the sliding column within the hollow column, and guarantees that the adjustment mechanism can accurately and effectively adjust the position of the device.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, by turning on the motor, its power is transmitted through the rotating shaft to drive the main hammer to rotate at high speed for primary crushing. At the same time, the ring and U-shaped frame drive the secondary hammer to strike the material a second time. In addition, the dust suction ring works with the dust collector to suck up and filter dust, thus achieving efficient crushing, improving the crushing effect, and effectively reducing dust pollution at the work site, providing a better working environment for the staff.

[0030] 2. In this utility model, the operator operates the rotating rod to drive the active bevel gear to rotate, which in turn drives the driven bevel gear to rotate the threaded rod inside the hollow column. This causes the moving column to move up and down along the threaded rod, ultimately raising and lowering the entire device. This achieves flexible adjustment of the device height, adapting to different working scenarios and construction requirements, improving the applicability and practicality of the device, and providing convenience for crushing operations. Attached Figure Description

[0031] Figure 1 This is a perspective view of a high-efficiency crushing device for roadbed rock excavation and cement concrete proposed in this utility model.

[0032] Figure 2 This is a side view of the structure of a high-efficiency crushing device for roadbed rock excavation and cement concrete proposed in this utility model;

[0033] Figure 3 This is a structural breakdown diagram of a high-efficiency crushing device for roadbed rock excavation and cement concrete proposed in this utility model.

[0034] Figure 4This is a structural cross-sectional view of a high-efficiency crushing device for roadbed rock excavation and cement concrete proposed in this utility model.

[0035] Figure 5 for Figure 4 Enlarged view of point A in the image.

[0036] Legend:

[0037] 1. Base; 2. Adjustment mechanism; 201. Bracket; 202. Hollow column; 203. Threaded rod; 204. Driven bevel gear; 205. Rotating rod; 206. Driving bevel gear; 207. Moving column; 3. Hollow cylinder; 4. Motor; 5. Rotating shaft; 6. Main hammer; 7. Ring; 8. U-shaped frame; 9. Secondary hammer; 10. Dust suction ring; 11. Dust suction port; 12. Vacuum cleaner; 13. Switch; 14. Fixing plate; 15. Warning sign; 16. Limit ring; 17. Limit groove; 18. Slide groove; 19. Slider; 20. Base plate; 21. Rubber pad. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Reference Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a high-efficiency crushing device for roadbed rock excavation and cement concrete, comprising a base 1, which supports the entire device. A hollow cylinder 3 is fixedly connected to the top of the base 1, and a motor 4 is fixedly connected to the rear side of the hollow cylinder 3. The motor 4 serves as a power source, providing power for the rotation of a rotating shaft 5. The output end of the motor 4 passes through the hollow cylinder 3 and is fixedly connected to the rotating shaft 5. The rotating shaft 5 can transmit the power of the motor 4 to the main hammer 6, driving the main hammer 6 to rotate. The front end of shaft 5 passes through hollow cylinder 3 and is fixedly connected to a main hammer 6. The main hammer 6 performs initial powerful crushing of excavated rocks and cement concrete in the roadbed through high-speed rotation. A ring 7 is fixedly connected to the outer wall of the front end of the hollow cylinder 3. Multiple U-shaped frames 8 are fixedly connected at equal intervals to the outer wall of the ring 7. The U-shaped frames 8 are used to fix secondary hammers 9 so that they can perform crushing operations in a suitable position. Secondary hammers 9 are fixedly connected to one side of each of the multiple U-shaped frames 8. The secondary hammers 9 perform secondary impacts on the material with different trajectories and angles, further enhancing the crushing effect. For crushing effect, a dust collection ring 10 is fixedly connected to the outer wall of the hollow cylinder 3. The dust collection ring 10 can collect the dust generated during the crushing operation. Multiple dust collection ports 11 are equidistantly opened on the front side of the dust collection ring 10, which can draw in the surrounding dust-laden air. A vacuum cleaner 12 is fixedly connected to the top right side of the base 1. The vacuum cleaner 12 generates suction to filter the dust-laden air drawn in by the dust collection ring 10. The left side of the vacuum cleaner 12 is connected to the right side of the dust collection ring 10 to ensure that the dust-laden air is filtered. Air can smoothly enter the vacuum cleaner 12 from the suction ring 10. The bottom of the base 1 is provided with an adjustment mechanism 2, which can adjust the height and level of the device to adapt to different working environments and requirements. The outer right rear end of the hollow cylinder 3 is fixedly connected to a fixing plate 14. The fixing plate 14 is used to install and support the warning sign 15. The right side of the fixing plate 14 is fixedly connected to the warning sign 15. The warning sign 15 is used to convey important safety information, operating precautions and other content to the operator or surrounding personnel.

[0040] Specifically, when motor 4 is turned on, its output end begins to rotate. The output power is transmitted through shaft 5. Since one end of shaft 5 is fixed to the output end of motor 4 and passes through hollow cylinder 3, it drives the main hammer 6 connected to the front end to rotate at high speed for crushing. At the same time, multiple U-shaped frames 8 are evenly distributed on the outer wall of the ring 7, and the auxiliary hammers 9 fixed on one side of the U-shaped frames 8 strike the material a second time with different trajectories and angles, further improving the crushing effect. During the crushing operation, a large amount of dust will be generated. At this time, the dust suction ring 10 on the outer wall of the hollow cylinder 3 plays a role. The dust suction ports 11 evenly opened on the front side of the dust suction ring 10 can suck in the surrounding dust-laden air. The right side of the dust suction ring 10 is connected to the left side of the vacuum cleaner 12 fixed on the top right side of the base 1. The vacuum cleaner 12 generates suction to filter the dust-laden air sucked in by the dust suction ring 10, thereby effectively reducing dust pollution at the work site. The fixing plate 14 serves to install and support the warning sign 15, which is used to convey important safety information to the operators or people around.

[0041] Reference Figure 2 , Figure 4 and Figure 5The adjustment mechanism 2 includes a bracket 201, which connects the base 1 and other components, providing a stable support foundation for the adjustment mechanism 2. The top of the bracket 201 is fixedly connected to the bottom of the base 1, enabling the adjustment mechanism 2 to be integrated with the entire device, thus allowing adjustment of the device's height and level. Hollow columns 202 are fixedly connected to the four corners of the bottom of the bracket 201. Threaded rods 203 are rotatably connected to the top inner sides of the hollow columns 202. The threaded rods 203 rotate to move the movable column 207 vertically, thereby adjusting the device height. Driven bevel gears 204 are fixedly connected to the top outer walls of the threaded rods 203, transmitting power to the rotating rod 205 to drive the threaded rods 203 to rotate. Rotating rods 205 are rotatably connected to one side of the outer walls of the hollow columns 202, facilitating control of the adjustment process. One end of each rotating rod 205 passes through a corresponding hollow column 202 and is fixedly connected to an active bevel gear 206. The active bevel gear 206 converts the rotation of the rotating rod 205 into the rotation of the driven bevel gear 204, realizing power transmission. Multiple active bevel gears 206 are respectively meshed with corresponding driven bevel gears 204. The bottom of the outer wall of multiple threaded rods 203 is threadedly connected to a movable column 207. The movable column 207 moves up and down in a straight line when the threaded rod 203 rotates, realizing the adjustment of the device height. The outer walls of multiple movable columns 207 are slidably connected to the inside of the corresponding hollow column 202. The hollow column 202 plays a limiting and guiding role for the movable column 207, ensuring that the movable column 207 moves smoothly. The size of the hollow column 202 and the movable column 207 are matched to ensure the smoothness and stability of the sliding of the movable column 207 in the hollow column 202, so that the adjustment mechanism 2 can accurately and effectively adjust the position of the device.

[0042] Specifically, when the height of the device needs to be adjusted, the operator can operate the rotating rod 205. The rotating rod 205 will drive the driving bevel gear 206 to rotate. The driving bevel gear 206 meshes with the driven bevel gear 204. The rotation of the driving bevel gear 206 will drive the driven bevel gear 204 to rotate, thereby causing the threaded rod 203 to rotate inside the hollow column 202. When the threaded rod 203 rotates, the moving column 207 will move up and down linearly along the threaded rod 203. By controlling the rotation direction of the rotating rod 205, the moving column 207 can be raised or lowered. The up and down movement of the moving column 207 will drive the entire device to rise or fall, thereby realizing the adjustment of the device height. This ensures the smoothness and stability of the sliding of the moving column 207 inside the hollow column 202, and ensures that the adjustment mechanism 2 can accurately and effectively adjust the position of the device.

[0043] Reference Figure 3 , Figure 4 and Figure 5A switch 13 is fixedly connected to the left side of the base 1. The switch 13 provides the operator with a convenient way to control the operating status of the motor 4. The switch 13 is electrically connected to the motor 4, and can start or stop the motor 4 by operating the switch 13, thereby controlling the start and stop of the crushing operation. A limit ring 16 is fixedly connected to the rear side of the main hammer 6. The limit ring 16 can play a preliminary positioning role for the rotation of the main hammer 6. A limit groove 17 is opened on the front side of the hollow cylinder 3. The limit groove 17 cooperates with the limit ring 16 to limit and guide the rotation of the main hammer 6, ensuring the stability and accuracy of the rotation of the main hammer 6. Sliding grooves 18 are opened on the left and right sides of the interior of the multiple hollow columns 202. The groove 18 provides a track for the sliding of the slider 19. The top left and right sides of the outer wall of the multiple moving columns 207 are fixedly connected to the slider 19. The slider 19 slides in the groove 18 and plays a limiting and guiding role in the up and down movement of the moving column 207. The multiple sliders 19 are respectively slidably connected to the interior of the corresponding groove 18 to ensure that the moving column 207 can move up and down smoothly and accurately. The bottom of the multiple moving columns 207 is fixedly connected to the base plate 20. The base plate 20 increases the contact area between the moving column 207 and the ground and improves the stability of the device. The bottom of the multiple base plates 20 is fixedly connected to multiple rubber pads 21 at equal intervals. The rubber pads 21 play a buffering and shock absorption role.

[0044] Specifically, the operator can conveniently control the operating status of the motor 4 by operating switch 13, thereby controlling the rotation of the main hammer 6, limiting and guiding the rotation of the main hammer 6, ensuring the stability and accuracy of the main hammer 6 during rotation, and preventing the main hammer 6 from shaking or deviating. When the moving column 207 moves up and down in a straight line under the drive of the threaded rod 203, the slider 19 will slide in the slide groove 18, which can limit and guide the movement of the moving column 207, ensuring that the moving column 207 can move up and down smoothly and accurately. The base plate 20 increases the contact area between the moving column 207 and the ground, improving the stability of the device and making the device more stable during operation. The rubber pad 21 plays a role in buffering and shock absorption, which can reduce the impact of the vibration generated by the device during operation on the ground.

[0045] Working Principle: When using the high-efficiency crushing device, the motor 4 is turned on, and its output end begins to rotate. The output power is transmitted through the rotating shaft 5. Since one end of the rotating shaft 5 is fixed to the output end of the motor 4 and passes through the hollow cylinder 3, it drives the main hammer 6 connected to the front end to rotate at high speed for crushing. At the same time, multiple U-shaped frames 8 evenly distributed on the outer wall of the ring 7, and the auxiliary hammers 9 fixed on one side of the U-shaped frames 8, strike the material a second time with different trajectories and angles, further improving the crushing effect. During the crushing operation, a large amount of dust is generated. At this time, the dust suction ring 10 on the outer wall of the hollow cylinder 3 plays a role. The dust suction ports 11 evenly opened on the front side of the dust suction ring 10 can suck in the surrounding dust-laden air. The right side of the dust suction ring 10 is connected to the left side of the vacuum cleaner 12 fixed to the top right side of the base 1. The vacuum cleaner 12 generates... The suction power filters the dust-laden air drawn in by the suction ring 10, effectively reducing dust pollution at the work site. When the height of the device needs to be adjusted, the operator can operate the rotating rod 205, which drives the active bevel gear 206 to rotate. The active bevel gear 206 meshes with the driven bevel gear 204. The rotation of the active bevel gear 206 drives the driven bevel gear 204 to rotate, which in turn causes the threaded rod 203 to rotate inside the hollow column 202. When the threaded rod 203 rotates, the moving column 207 moves up and down along the threaded rod 203. By controlling the rotation direction of the rotating rod 205, the moving column 207 can be raised or lowered. The up and down movement of the moving column 207 will drive the entire device to rise or fall, thereby achieving the adjustment of the device height.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency breaking device for subgrade excavation and cement concrete, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected with a hollow cylinder (3), the rear side of the hollow cylinder (3) is fixedly connected with a motor (4), the output end of the motor (4) penetrates through the hollow cylinder (3) and is fixedly connected with a rotating shaft (5), the front end of the rotating shaft (5) penetrates through the hollow cylinder (3) and is fixedly connected with a main hammer (6), the front end outer wall of the hollow cylinder (3) is fixedly connected with a ring (7), a plurality of U-shaped frames (8) are equidistantly fixedly connected to the outer wall of the ring (7), one side of each of the plurality of U-shaped frames (8) is fixedly connected with a vice hammer (9), the outer wall of the hollow cylinder (3) is fixedly connected with a dust suction ring (10), a plurality of dust suction ports (11) are equidistantly formed in the front side of the dust suction ring (10), the right top of the base (1) is fixedly connected with a dust collector (12), the left side of the dust collector (12) is in communication with the right side of the dust suction ring (10), and the bottom of the base (1) is provided with an adjusting mechanism (2).

2. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 1, characterized in that: The adjusting mechanism (2) comprises a support (201), the top of the support (201) is fixedly connected to the bottom of the base (1), hollow columns (202) are fixedly connected to the four corners of the bottom of the support (201), threaded rods (203) are rotatably connected to the inner top of each of the plurality of hollow columns (202), drive bevel gears (204) are fixedly connected to the outer wall top of each of the plurality of threaded rods (203), rotating rods (205) are rotatably connected to one side of the outer wall of each of the plurality of hollow columns (202), driving bevel gears (206) are fixedly connected to one end of each of the plurality of rotating rods (205) and penetrate through the corresponding hollow column (202), a plurality of driving bevel gears (206) are respectively meshingly connected with the corresponding drive bevel gears (204), and the outer wall bottom of each of the plurality of threaded rods (203) is threadedly connected with a moving column (207).

3. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 1, characterized in that: The left side of the base (1) is fixedly connected with a switch (13), and the switch (13) is electrically connected with the motor (4).

4. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 1, characterized in that: The right rear end of the outer wall of the hollow cylinder (3) is fixedly connected with a fixed plate (14), and the right side of the fixed plate (14) is fixedly connected with a warning sign (15).

5. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 1, characterized in that: The rear side of the main hammer (6) is fixedly connected with a limiting ring (16), and the front side of the hollow cylinder (3) is provided with a limiting groove (17).

6. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 2, characterized in that: The left and right sides of the interior of each of the plurality of hollow columns (202) are provided with a sliding groove (18), the left and right sides of the outer wall top of each of the plurality of moving columns (207) are fixedly connected with a sliding block (19), and the plurality of sliding blocks (19) are respectively and slidably connected with the interior of the corresponding sliding groove (18).

7. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 2, characterized in that: The bottom of each of the plurality of moving columns (207) is fixedly connected with a bottom plate (20), and the bottom of each of the plurality of bottom plates (20) is equidistantly fixedly connected with a plurality of rubber pads (21).

8. The high-efficiency subgrade excavation and cement concrete breaking device according to claim 2, characterized in that: The outer wall of each of the plurality of moving columns (207) is slidably connected in the interior of the corresponding hollow column (202), and the size of the hollow column (202) and the moving column (207) is matched.

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