Sorting and packing production equipment with easy disassembly

Abstract

This utility model relates to the technical field of sorting and packing production equipment, and discloses a sorting and packing production equipment that is easy to disassemble. It includes a frame, with support plates fixedly connected to the top left and right sides of the frame. Locking mechanisms are provided on the right sides of both support plates, and buffer mechanisms are provided on the right sides of both locking mechanisms. A conveying mechanism is provided between adjacent support plates. Each locking mechanism includes two mounting rails, with adjacent sides of each mounting rail fixedly connected to the right end of the opposite side of the corresponding support plate. A slide rail is provided on the right side of each mounting rail. In this utility model, a locking block connects the slide rail to the support plate, and a tapered pin engages with a positioning pin hole for further positioning. An eccentric wheel, through a connecting rod, causes a sliding rod to move downwards, which in turn drives a wedge block downwards to contact the wedge groove. The frictional self-locking of the eccentric wheel allows the locking block and mounting rail to be quickly and easily fixed and disassembled.

Description

Technical Field

[0001] This utility model relates to the technical field of sorting and packing production equipment, and in particular to sorting and packing production equipment that is easy to disassemble. Background Technology

[0002] Sorting and packing production equipment is an automated production line used to arrange items in an orderly manner and pack them into boxes according to rules. It is applied in logistics warehousing, food processing and other industries. Its core function is to improve the efficiency and accuracy of item sorting and packing, and reduce manual operation costs.

[0003] Traditional manufacturing focuses on large-volume and low-variety production, with equipment pursuing high integration and stability. With consumption upgrading, small-volume and multi-variety production has become the mainstream, requiring frequent adjustments to production line layout or changes in processes. Traditional fixed equipment is complex to disassemble and assemble, and has a long adjustment cycle. Therefore, there is a need for sorting and packing production equipment that is easy to disassemble. By transforming equipment into reusable modular resources, capacity adaptation can be achieved at low cost and high efficiency.

[0004] Early sorting and packing equipment used an integrated welded frame, with each functional module rigidly connected by welding. Due to the welding, it was difficult to disassemble each module, requiring the disassembly of surrounding parts one by one, resulting in long maintenance time. To solve this problem, existing equipment has gradually adopted a modular design, with each functional module connected by quick bolts and slot interfaces, enabling independent disassembly of the modules. However, in actual use, after long-term operation, the quick bolts and slot connecting parts experience increased clearance between modules due to vibration or wear, affecting accuracy and increasing the risk of modules falling off, which cannot meet the needs of users. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a sorting and packing production equipment that is easy to disassemble, aiming to improve the problem in the prior art where the gap between modules increases due to vibration or wear of quick bolts and slot connection components, affecting accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sorting and packing production equipment that is easy to disassemble, including a frame, with support plates fixedly connected to the top left and right sides of the frame, a locking mechanism provided on the right side of each of the two support plates, a buffer mechanism provided on the right side of each of the two locking mechanisms, and a conveying mechanism provided between the adjacent support plates.

[0007] The locking mechanism includes two mounting rails. The adjacent sides of the two mounting rails are fixedly connected to the opposite right end of the corresponding support plate. A slide rail is provided on the right side of each mounting rail. A locking block is fixedly connected to the left end of the front and rear sides of each slide rail. One side of each locking block is slidably connected to the inner wall of the corresponding mounting rail. A wedge-shaped groove is formed at the top of each locking block. A sliding groove is formed on the upper side of the inner wall of each of the two mounting rails. A wedge block is slidably connected inside each of the sliding grooves. A sliding rod is fixedly connected to the top of each wedge block. The top of each sliding rod penetrates the top of the inner wall of the corresponding mounting rail. A connecting rod is fixedly connected to the upper middle part of the outer wall of each sliding rod. An eccentric wheel is rotatably connected to the right side of the outer wall of each connecting rod. A groove is formed on the left side of each locking block. A positioning component is provided inside each of the grooves.

[0008] As a further description of the above technical solution:

[0009] The buffer mechanism includes a buffer plate, the left end of which is rotatably connected to the right end of a slide groove. A housing is fixedly connected to the front and rear sides of the top of the buffer plate. A slider is slidably connected inside each of the two housings. Limiting grooves are formed on the front and rear sides of the interior of each of the two housings. The front sides of the two sliders are slidably connected to the inner walls of their respective limiting grooves. Rotating rods are rotatably connected to the top of each of the two sliders. The other ends of the two rotating rods are rotatably connected to the upper middle part of the front and rear sides of the right end of the corresponding slide groove. Damping springs are fixedly connected to the lower middle part of the left end of each of the two sliders. The other ends of the two damping springs are fixedly connected to the left inner side of the corresponding housing.

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

[0011] The positioning component includes tapered pins, the outer walls of two tapered pins are slidably connected inside the groove, and the right ends of the two tapered pins are fixedly connected to damping springs. The right ends of the two damping springs are respectively fixedly connected to the inner right ends of the corresponding grooves. The left side of the inner sides of the two mounting rails are provided with positioning pin holes.

[0012] As a further description of the above technical solution:

[0013] The conveying mechanism includes a motor and a conveyor belt. The rear end of the motor is fixedly connected to the left front end of the front support plate. Rollers are rotatably connected to the left and right ends of adjacent sides of the two support plates. The two rollers are connected by the conveyor belt. The output end of the motor passes through the front end of the support plate and is fixedly connected to the front end of the corresponding roller.

[0014] As a further description of the above technical solution:

[0015] Each of the two support plates has a connecting plate on its top side on an adjacent side, and a blocking plate is fixedly connected to the bottom of each of the two connecting plates. Each of the two connecting plates has an installation groove on an adjacent side of the support plate. Bolts are slidably connected inside the two installation grooves, and nuts are threaded onto the outer walls of the two bolts on opposite sides.

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

[0017] A flow divider is fixedly connected to the top right side of the chute, and a second motor is fixedly connected to the bottom of the chute. The output end of the second motor passes through the bottom of the chute and is fixedly connected to a swing arm.

[0018] As a further description of the above technical solution:

[0019] Multiple crossbeams are fixedly connected to the upper and lower ends of adjacent sides of the two support plates, and multiple support rods are fixedly connected to the top of the multiple crossbeams.

[0020] As a further description of the above technical solution:

[0021] The bracket has base plates fixedly connected to all four sides of its bottom. Casters are fixedly connected to the four corners of the bottom of the base plates. Feet are threadedly connected to the bottom of the base plates.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the locking block and the mounting rail connect the slide groove and the support plate. The tapered pin and the positioning pin hole engage with each other for further positioning. The eccentric wheel causes the slide rod to move downward through the connecting rod. The slide rod drives the wedge block downward to contact the wedge groove, making the connection between the locking block and the mounting rail more stable. At the same time, the tapered pin slides inside the groove through the damping spring, which plays a positioning role and avoids wear caused by vibration. The friction self-locking of the eccentric wheel allows the locking block and the mounting rail to be quickly and easily fixed and disassembled.

[0024] 2. In this utility model, when the material passes through the buffer plate, the impact force it carries causes the buffer plate to rotate. Through the action of the rotating rod, the slider slides inside the shell. While the slider moves, it exerts a squeezing effect on the second damping spring. After the second damping spring absorbs and dissipates the impact force, it resets the slider. At the same time, it drives the buffer plate to rotate and reset, thus buffering the material and preventing the material from colliding with the box wall or the bottom material from being deformed by pressure. Attached Figure Description

[0025] Figure 1 This is a perspective view of the easily disassembled sorting and packing production equipment proposed in this utility model.

[0026] Figure 2This is a front view of the easily disassembled sorting and packing production equipment proposed in this utility model.

[0027] Figure 3 This is a cross-sectional view of the support plate of the easily disassembled sorting and packing production equipment proposed in this utility model.

[0028] Figure 4 This is a cross-sectional view of the card block of the easily disassembled sorting and packing production equipment proposed in this utility model;

[0029] Figure 5 for Figure 1 Enlarged view of point A in the middle.

[0030] Legend:

[0031] 1. Frame; 2. Support plate; 3. Locking mechanism; 301. Mounting rail; 302. Slide rail; 303. Locking block; 304. Wedge groove; 305. Slide groove; 306. Wedge block; 307. Slide rod; 308. Connecting rod; 309. Eccentric wheel; 310. Groove; 311. Positioning assembly; 3111. Tapered pin; 3112. Damping spring one; 3113. Positioning pin hole; 4. Buffer mechanism; 401. Buffer plate; 4 02. Housing; 403. Slider; 404. Rotating rod; 405. Damping spring II; 406. Limiting groove; 5. Conveying mechanism; 501. Motor I; 502. Roller; 503. Conveyor belt; 6. Connecting plate; 7. Blocking plate; 8. Mounting groove; 9. Bolt; 10. Nut; 11. Diverter plate; 12. Motor II; 13. Swing arm; 14. Crossbeam; 15. Support rod; 16. Base plate; 17. Foot; 18. Casters. Detailed Implementation

[0032] 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.

[0033] Reference Figure 1 , Figure 3 and Figure 4This utility model provides an embodiment of a sorting and packing production equipment that is easy to disassemble, including a frame 1. Support plates 2 are fixedly connected to the top left and right sides of the frame 1. Locking mechanisms 3 are provided on the right sides of both support plates 2, and buffer mechanisms 4 are provided on the right sides of both locking mechanisms 3. A conveying mechanism 5 is provided between adjacent support plates 2. The locking mechanism 3 includes two mounting rails 301. The adjacent sides of the two mounting rails 301 are respectively fixedly connected to the right ends of the opposite sides of the corresponding support plates 2. The mounting rails 301 are used to slide with a locking block 303. A slide rail 302 is provided on the right side of the mounting rail 301. A locking block 303 is fixedly connected to the left end of both the front and rear sides of the slide rail 302. One side of each locking block 303 is slidably connected to the inner wall of the corresponding mounting rail 301. The locking blocks 303 and the mounting rail 301 allow the slide rail 302 to connect with the support plate 2. A wedge-shaped groove 304 is provided on the top of each locking block 303. A sliding groove 305 is provided on the upper side of the inner wall of each mounting rail 301. A wedge block 306 is slidably connected inside each sliding groove 305. The wedge block 306 secures the locking block 303 through the wedge-shaped groove 304. For positioning, the tops of the two wedges 306 are fixedly connected to slide rods 307, and the tops of the two slide rods 307 penetrate the top of the inner wall of the corresponding mounting rail 301. The slide rods 307 can drive the wedges 306 to move up and down. The upper middle part of the outer wall of the two slide rods 307 is fixedly connected to the connecting rods 308. The right side of the outer wall of the two connecting rods 308 is rotatably connected to the eccentric wheel 309, which achieves self-locking and allows for quick installation. The left side of the two locking blocks 303 is provided with a groove 310, and the inside of the two grooves 310 is provided with a positioning component 311. Positioning component 311 includes tapered pins 3111. The outer walls of the two tapered pins 3111 are slidably connected inside the groove 310. The right ends of the two tapered pins 3111 are fixedly connected to damping springs 3112. The damping springs 3112 prevent the tapered pins 3111 from wearing due to vibration. The right ends of the two damping springs 3112 are fixedly connected to the right ends of the corresponding grooves 310. The left side of the interior of the two mounting rails 301 are provided with positioning pin holes 3113. The engagement of the tapered pins 3111 with the positioning pin holes 3113 serves as a positioning function.

[0034] Specifically, the device achieves precise positioning of the locking block 303 through the guiding action of the mounting rail 301, connecting the slide groove 305 to the support plate 2. The tapered pin 3111 at the front end of the locking block 303 tightly engages with the positioning pin hole 3113 on the inner side of the mounting rail 301, further ensuring positioning accuracy. When the handle is pressed down, the eccentric wheel 309 begins to rotate, performing a special circular rotation around the connecting rod 308 as the axis. The bottom of the outer wall of the eccentric wheel 309 contacts the top of the mounting rail 301. The connecting rod 308 is fixedly connected to the slide rod 307. As the rotation continues, the eccentric wheel 309, through leverage... The connecting rod 308 and the slide rod 307 are pushed downwards. The slide rod 307 then drives the wedge block 306 downwards to contact the wedge groove 304 and generate friction. The interaction between the wedge block 306 and the wedge groove 304 causes the locking block 303 to continue sliding into the mounting rail 301, thereby strengthening the connection stability between the locking block 303 and the mounting rail 301. The tapered pin 3111 slides in the groove 310 under the action of the damping spring, which not only plays a positioning role, but also prevents wear caused by vibration. The friction self-locking mechanism of the eccentric wheel 309 makes the fixing and disassembly of the locking block 303 and the mounting rail 301 quick and convenient.

[0035] Reference Figure 2 , Figure 3 and Figure 5The buffer mechanism 4 includes a buffer plate 401, the left end of which is rotatably connected to the right end of a slide groove 305. Housings 402 are fixedly connected to the front and rear sides of the top of the buffer plate 401. Slider blocks 403 are slidably connected inside the two housings 402. Limiting grooves 406 are formed on the front and rear sides of the interior of each housing 402, guiding and limiting the sliders 403 to prevent them from falling off. The front sides of the two sliders 403 are slidably connected to the inner walls of their respective limiting grooves 406. Rotating rods 404 are rotatably connected to the top of each slider 403. The other ends of the two rotating rods 404 are rotatably connected to the upper middle part of the front and rear sides of the right end of the corresponding slide groove 305. When the buffer plate 401 rotates, it drives the sliders 403 to move via the rotating rods 404. Damping springs 405 are fixedly connected to the lower middle part of the left end of each slider 403, absorbing and dissipating impact force. The other ends of the two damping springs 405 are fixedly connected to the inner left end of the corresponding housing 402. The conveying mechanism 5 includes a motor 501 and a conveyor belt 503. The rear end of the motor 501 is fixedly connected to the left front end of the front support plate 2. Rollers 502 are rotatably connected to the left and right ends of the adjacent sides of the two support plates 2. The two rollers 502 are connected by the conveyor belt 503. The conveyor belt 503 makes the rollers 502 rotate synchronously. The output end of the motor 501 passes through the front end of the support plate 2 and is fixedly connected to the front end of the corresponding roller 502. The motor 501 drives the roller 502 to rotate. A diverter plate 11 is fixedly connected to the top right side of the chute 305. A motor 12 is fixedly connected to the bottom of the chute 302. The output end of the motor 12 passes through the bottom of the chute 302 and is fixedly connected to a swing arm 13. The motor 12 drives the swing arm 13 to rotate to guide and divert different materials.

[0036] Specifically, starting motor 501 causes roller 502 to rotate, conveying materials via conveyor belt 503. Then, as the materials slide along slide rail 302, motor 12 drives swing arm 13 to rotate, causing different materials to be diverted to both sides of diversion plate 11. Upon entering the packaging box, the materials come into contact with buffer plate 401. The kinetic energy carried by the materials pushes buffer plate 401 to rotate. As buffer plate 401 rotates, the angle between buffer plate 401 and the right side of slide rail 302 gradually increases. As the pressure gradually increases, the rotating rod 404 causes the slider 403 to move inside the housing 402. The limiting groove 406 is responsible for limiting the range of movement of the slider 403 and guiding its direction. During the movement, the slider 403 squeezes the damping spring 405, transmitting the impact force to it. After the damping spring 405 absorbs and dissipates the impact force, the slider 403 returns to its original position. At the same time, the buffer plate 401 also rotates back to its original position, buffering the material and ensuring that the material does not collide with the box wall or cause the bottom material to be subjected to excessive pressure and deform.

[0037] Reference Figure 1 , Figure 2 and Figure 3 Each of the two support plates 2 has a connecting plate 6 on its top side on an adjacent side. Each of the two connecting plates 6 has a blocking plate 7 fixedly connected to its bottom. The blocking plate 7 guides the material. Each of the two connecting plates 6 has an installation groove 8 on an adjacent side of the support plate 2. Each of the two installation grooves 8 has a bolt 9 slidably connected inside. Each of the outer walls of the two bolts 9 has a nut 10 threadedly connected to the side away from each other. The bolts 9 and nuts 10 are locked together to fix the connecting plate 6 to the support plate 2. Each of the two support plates 2 has multiple crossbeams 14 fixedly connected to its top side on an adjacent side. Each of the multiple crossbeams 14 has multiple support rods 15 fixedly connected to its top. The support rods 15 support the conveyor belt 503 and prevent it from falling. Each of the four sides of the bottom of the bracket has a base plate 16 fixedly connected. Each of the four corners of the bottom of the multiple base plates 16 has a caster 18 fixedly connected. The caster 18 facilitates movement. Each of the four sides of the bottom of the multiple base plates 16 has a foot 17 threadedly connected. The foot 17 adjusts the height.

[0038] Specifically, the disordered material above the conveyor belt 503 is blocked by the two baffle plates 7 and transported by the conveyor belt 503, so that the material can be arranged in an orderly manner, which facilitates the subsequent diversion work. The bolts 9 and nuts 10 are tightened to fix the baffle plates 7 to the support plate 2 through the connecting plate 6. At the same time, by moving the baffle plates 7 on both sides, the distance between the two baffle plates 7 is increased, and materials of different sizes can be arranged in an orderly manner. The bottom feet 17 provide stable support for the device and can adjust the height. The casters 18 make it easy to move the device.

[0039] Working principle: The device positions the locking block 303 via the guide rail 301, connecting the slide groove 305 to the support plate 2. Simultaneously, the tapered pin 3111 on the front side of the locking block 303 engages with the positioning pin hole 3113 on the inner side of the mounting rail 301 for further positioning. Pressing down the handle causes the eccentric wheel 309 to rotate. The eccentric wheel 309 rotates in a special circular motion around the connecting rod 308, causing the bottom of the outer wall of the eccentric wheel 309 to contact the top of the mounting rail 301. The connecting rod 308 is fixedly connected to the slide rod 307. With continued rotation, the eccentric wheel 309 is moved by the lever... The force drives the connecting rod 308 and the slide rod 307 to move downwards, causing the slide rod 307 to drive the wedge block 306 downwards to contact the wedge groove 304 and generate friction. This causes the locking block 303 to continue sliding into the mounting rail 301 through the action of the wedge block 306 and the wedge groove 304, making the connection between the locking block 303 and the mounting rail 301 more stable. At the same time, the tapered pin 3111 slides in the groove 310 through the damping spring 3112, which plays a positioning role and avoids wear caused by vibration. The friction self-locking of the eccentric wheel 309 allows the locking block 303 and the mounting rail 301 to be quickly and easily fixed and disassembled.

[0040] After the material is diverted through the slide 302, it slides into the packaging box. When the material passes through the buffer plate 401, the impact force it carries causes the buffer plate 401 to rotate. As the buffer plate 401 rotates, the angle between the buffer plate 401 and the right side of the slide 302 increases. At this time, the slider 403 slides inside the housing 402 through the action of the rotating rod 404. At the same time, the limiting groove 406 plays a limiting and guiding role. While the slider 403 moves, it exerts a squeezing effect on the second damping spring 405. At this time, the impact force is transmitted from the buffer plate 401 to the second damping spring 405 through the slider 403. After the second damping spring 405 absorbs and dissipates the impact force, it causes the slider 403 to reset. At the same time, it drives the buffer plate 401 to rotate and reset, thus buffering the material and preventing the material from colliding with the box wall or the bottom material from being deformed by pressure.

[0041] 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 sequencing and packing production plant for easy disassembly, comprising a frame (1), characterized in that: The top left and right sides of the frame (1) are fixedly connected with support plates (2), and the right sides of the two support plates (2) are provided with locking mechanisms (3), the right sides of the two locking mechanisms (3) are provided with buffer mechanisms (4), and the adjacent two support plates (2) are provided with conveying mechanisms (5). The locking mechanism (3) includes two mounting rails (301). The adjacent sides of the two mounting rails (301) are fixedly connected to the right ends of the opposite sides of the corresponding support plates (2). A slide rail (302) is provided on the right side of the two mounting rails (301). A locking block (303) is fixedly connected to the left ends of the front and rear sides of the slide rail (302). One side of the two locking blocks (303) is slidably connected to the inner wall of the corresponding mounting rail (301). A wedge groove (304) is provided on the top of each of the two locking blocks (303). A sliding groove (305) is provided on the upper side of the inner wall of each of the two mounting rails (301). Both of the two slide grooves (305) are slidably connected to the inside of the two slide blocks (306), and the top of each of the two slide blocks (306) is fixedly connected to the top of the slide rod (307). The top of each of the two slide rods (307) passes through the top of the inner wall of the corresponding mounting rail (301). The upper middle part of the outer wall of each of the two slide rods (307) is fixedly connected to the connecting rod (308). The right side of the outer wall of each of the two connecting rods (308) is rotatably connected to the eccentric wheel (309). The left side of each of the two locking blocks (303) is provided with a groove (310), and the inside of each of the two grooves (310) is provided with a positioning component (311).

2. The easily disassembled sequencing-by-ligation production apparatus of claim 1, wherein: The buffer mechanism (4) includes a buffer plate (401). The left end of the buffer plate (401) is rotatably connected to the right end of the slide groove (305). The top front and rear sides of the buffer plate (401) are fixedly connected to housings (402). The interiors of the two housings (402) are slidably connected to sliders (403). The front and rear sides of the interiors of the two housings (402) are provided with limiting grooves (406). The front sides of the two sliders (403) are slidably connected to the inner walls of the corresponding limiting grooves (406). The tops of the two sliders (403) are rotatably connected to rotating rods (404). The other ends of the two rotating rods (404) are rotatably connected to the upper middle part of the front and rear sides of the right end of the corresponding slide groove (305). The lower middle part of the left end of the two sliders (403) is fixedly connected to damping springs (405). The other ends of the two damping springs (405) are fixedly connected to the left inner side of the corresponding housing (402).

3. The easily disassembled sequencing-by-ligation cartridge production apparatus of claim 1, wherein: The positioning component (311) includes a tapered pin (3111), the outer walls of the two tapered pins (3111) are slidably connected inside the groove (310), the right ends of the two tapered pins (3111) are fixedly connected to a damping spring (3112), the right ends of the two damping springs (3112) are respectively fixedly connected to the inner right end of the corresponding groove (310), and the left side of the inner side of the two mounting rails (301) are provided with positioning pin holes (3113).

4. The easily disassembled sequencing-by-ligation cartridge production apparatus of claim 1, wherein: The conveying mechanism (5) includes a motor (501) and a conveyor belt (503). The rear end of the motor (501) is fixedly connected to the left front end of the front support plate (2). Rollers (502) are rotatably connected to the left and right ends of adjacent sides of the two support plates (2). The two rollers (502) are connected by transmission through the conveyor belt (503). The output end of the motor (501) passes through the front end of the support plate (2) and is fixedly connected to the front end of the corresponding roller (502).

5. The easily disassembled sequencing-by-ligation production apparatus of claim 1, wherein: A connecting plate (6) is provided on the top of each adjacent side of the two support plates (2), and a blocking plate (7) is fixedly connected to the bottom of each of the two connecting plates (6). An installation groove (8) is provided on each adjacent side of the two connecting plates (6) and the support plate (2). Bolts (9) are slidably connected inside the two installation grooves (8), and nuts (10) are threadedly connected to the outer walls of the two bolts (9) on the side away from each other.

6. The easily disassembled sequencing-by-ligation production apparatus of claim 1, wherein: A diverter plate (11) is fixedly connected to the top right side of the slide (305), and a motor (12) is fixedly connected to the bottom of the slide (302). The output end of the motor (12) passes through the bottom of the slide (302) and is fixedly connected to a swing arm (13).

7. The easily disassembled sequencing-by-ligation production apparatus of claim 1, wherein: Multiple crossbeams (14) are fixedly connected to the upper and lower ends of adjacent sides of the two support plates (2), and multiple support rods (15) are fixedly connected to the top of the multiple crossbeams (14).

8. The easily disassembled sequencing-by-ligation production apparatus of claim 1, wherein: The bracket is fixedly connected to a base plate (16) around its bottom, and casters (18) are fixedly connected to the four corners of the bottom of the multiple base plates (16). The multiple base plates (16) are threadedly connected to feet (17) around their bottom.

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