Novel material conveying device

Abstract

The utility model relates to the technical field of conveying devices, in particular to a novel material conveying device. The device comprises a base, a conveying frame and a limiting frame, an angle adjusting mechanism is assembled between the base and the conveying frame, and a limiting guide mechanism is assembled between the conveying frame and the limiting frame. Through the structural design of the angle adjusting mechanism, the device rotates by starting the first motor, one end of the connecting plate rotates around the first rotating shaft, and therefore angle adjustment is flexibly conducted according to needs; through the structural design of a limiting guide mechanism, the distance between two mounting grooves is adjusted by rotating two rotating wheels, and conveyed materials are guided through guide wheels and prevented from falling off from the two sides to affect the conveying efficiency; and through the structural design of the conveying mechanism, a second motor is started to rotate, so that a conveying belt rotates outside a driving wheel and a driven wheel in a reciprocating mode, and continuous conveying of the materials is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of conveying devices, in particular to a novel material conveying device. Background Art

[0002] In the construction industry, efficient and accurate material transportation is crucial for the smooth progress of projects. With the continuous expansion of construction scale and the increasing sophistication of construction techniques, the demand for material transportation is also increasing. In the past, material transportation in construction projects relied primarily on manual handling, a method that was not only inefficient but also labor-intensive, easily leading to worker fatigue and injury. With technological advances, simple mechanical conveying devices began to emerge, but these devices often had limited functions and could not meet the diverse material transportation needs. To adapt to the development of modern construction projects, a variety of advanced material conveying devices have emerged. These devices can be customized to suit different material types and construction environments, for example, they can transport a variety of building materials such as sand, gravel, cement, and bricks. They can quickly and accurately transport materials to designated locations, reducing labor and time costs. Their precise conveying capabilities also help ensure construction quality. Material conveying devices can safely and efficiently transport materials to elevated work surfaces, providing strong support for the smooth progress of projects.

[0003] For example, patent CN218706118U discloses a material conveying device for construction projects, specifically relating to the technical field of conveying devices, including a mounting plate, a plurality of support rods evenly hinged at the bottom, the cross-sectional shapes of the plurality of support rods being all set to an inverted T shape, a plurality of electric telescopic rods evenly hinged at the bottom of the mounting plate, a bottom plate being commonly provided at the bottom of the plurality of electric telescopic rods, a groove being provided at the top of the mounting plate, a plurality of first through holes being evenly provided at the top of the mounting plate, a conveying mechanism being provided inside the groove, and a plurality of collecting mechanisms being evenly provided at the bottom of the mounting plate. By providing a conveying mechanism, the utility model significantly improves the anti-slip properties of the conveyor belt used for conveying in the device. Due to the improved anti-slip properties of the conveyor belt, the material conveyed by the device will not slip during the conveying process, thereby significantly improving the conveying reliability of the device.

[0004] When using the above technology, it was found that the following technical problems exist in the existing technology: the existing material conveying device for construction projects cannot flexibly adjust the angle according to actual needs to facilitate the transportation of materials, and there are no obstructions on both sides, so the transported materials are likely to fall from both sides. Therefore, there is room for improvement. For this reason, we designed a new material conveying device to provide another technical solution to the above technical problems. Utility Model Content

[0005] Based on this, it is necessary to provide a new material conveying device to address the above technical problems, which is used to solve the technical problems of angle adjustment and limiting the two sides to prevent materials from falling from the sides.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A novel material conveying device includes a base, a conveying frame and a limiting frame. The conveying frame is installed on the top of the base, and the limiting frames are fixed to the tops of both sides of the conveying frame. An angle adjustment mechanism is installed between the base and the conveying frame, and a limiting guide mechanism is installed between the conveying frame and the limiting frame.

[0008] The angle adjustment mechanism includes a first motor, a first threaded screw, a first bearing, a matching block, a moving block, a cylindrical rod and a connecting strip. The first motor is fixed inside one end of the base, and the first threaded screw is fixed to the power output end of the first motor. The first bearing is fixed to the outside of one end of the first threaded screw. The first bearing is fixed to the base. The external thread of the first threaded screw is connected to the matching block. The matching block and the base are slidably connected. The top of the matching block is fixed with a moving block, and the two ends of the moving block are fixed with a cylindrical rod. The external rotation of the cylindrical rod is connected to the connecting strip.

[0009] Preferably, the angle adjustment mechanism also includes a first connecting seat, a first rotating shaft, a connecting plate, a second connecting seat and a second rotating shaft. The first connecting seat is fixed on both sides of the top of one end of the base, the two first connecting seats are internally rotatably connected to a first rotating shaft, the first rotating shaft is externally rotatably connected to a connecting plate, the second connecting seat is fixed on both sides of the bottom of one end of the connecting plate, the two second connecting seats are internally rotatably connected to the second rotating shaft, and the two connecting bars are rotatably connected to the second rotating shaft.

[0010] Preferably, the limit guide mechanism includes a second threaded screw, a second bearing, a rotating wheel, a mounting groove, a sliding rod, a limit head and a guide wheel. The internal thread of the limit frame is connected to the second threaded screw, one end of the second threaded screw is externally fixed with a second bearing, the other end of the second threaded screw is fixed with a rotating wheel, the outside of the second bearing is fixed with a mounting groove, two sliding rods are fixed on one side of the mounting groove, one end of the sliding rod is fixed with a limit head, the two sliding rods are both slidably connected to the limit frame, and a plurality of guide wheels are evenly distributed and rotatably connected inside the mounting groove.

[0011] Preferably, the interior of the conveying frame is equipped with a conveying mechanism, and the conveying mechanism includes a second motor, a driving bevel gear, a driven bevel gear, a driving wheel, a driven wheel and a conveyor belt. A second motor is fixed to one side of one end of the conveying frame, and the power output end of the second motor is fixed to the driving bevel gear, and the external meshing connection of the driving bevel gear is connected to the driven bevel gear. One end of the conveying frame is internally connected to the driving wheel, one end of the driving wheel is fixed to the driven bevel gear, and the other end of the conveying frame is internally connected to the driven wheel, and the driving wheel and the driven wheel are driven by a conveyor belt.

[0012] Preferably, a support wheel is rotatably connected in the middle of the conveyor frame, and a plurality of anti-slip protrusions are evenly distributed and fixed on the outside of the conveyor belt.

[0013] Preferably, a protective cover is fixed on one side of one end of the conveying frame and located on the outside of the second motor.

[0014] Preferably, a plurality of connecting columns are fixed to the top of the connecting plate, the tops of the plurality of connecting columns are fixed to the conveying frame, and self-locking universal wheels are fixed to the four end corners of the bottom of the base.

[0015] It can be seen without a doubt that the above-mentioned technical solution of this application can definitely solve the technical problem to be solved by this application.

[0016] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0017] 1. The present invention adopts the structural design of the angle adjustment mechanism, so that the device can be rotated by starting the first motor, so that one end of the connecting plate can be rotated around the first rotating shaft, thereby flexibly adjusting the angle as needed, thereby improving the flexibility of the material conveying device.

[0018] 2. The utility model adopts the structural design of the limit guide mechanism, so that the device can adjust the distance between the two installation grooves by rotating the two wheels, and guide the conveyed materials through the guide wheels to prevent them from falling on both sides and affecting the conveying efficiency.

[0019] 3. The utility model realizes continuous conveying of materials by means of the structural design of the conveying mechanism, so that the device can realize reciprocating rotation of the conveyor belt outside the driving wheel and the driven wheel by starting the second motor to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the base of the utility model;

[0023] Figure 3 This is a schematic diagram of the connection structure between the limit frame and the installation slot of the utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure of the installation groove section of the utility model;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the conveyor frame of the present utility model;

[0026] Figure 6 This is a schematic diagram of the connection structure of the base, conveying frame and limiting frame of the utility model.

[0027] In the figure: 1. base; 2. conveyor frame; 3. limit frame; 4. first motor; 5. first screw rod; 6. first bearing; 7. matching block; 8. moving block; 9. cylindrical rod; 10. connecting bar; 11. first connecting seat; 12. first rotating shaft; 13. connecting plate; 14. second connecting seat; 15. second rotating shaft; 16. second screw rod; 17. second bearing; 18. rotating wheel; 19. mounting slot; 20. sliding rod; 21. limit head; 22. guide wheel; 23. second motor; 24. driving bevel gear; 25. driven bevel gear; 26. driving wheel; 27. driven wheel; 28. conveyor belt; 29. supporting wheel; 30. anti-slip protrusion; 31. protective cover; 32. connecting column; 33. self-locking universal wheel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] Example 1

[0033] Reference Figure 1 - Figure 6 A novel material conveying device includes a base 1, a conveying frame 2 and a limiting frame 3. The conveying frame 2 is assembled on the top of the base 1, and the limiting frames 3 are fixed on the tops of both sides of the conveying frame 2. An angle adjustment mechanism is assembled between the base 1 and the conveying frame 2, and a limiting guide mechanism is assembled between the conveying frame 2 and the limiting frame 3.

[0034] The angle adjustment mechanism includes a first motor 4, a first threaded screw 5, a first bearing 6, a matching block 7, a moving block 8, a cylindrical rod 9 and a connecting bar 10. The first motor 4 is fixed inside one end of the base 1, and the first threaded screw 5 is fixed to the power output end of the first motor 4. The first bearing 6 is fixed to the outside of one end of the first threaded screw 5. The first bearing 6 is fixed to the base 1, and the external thread connection of the first threaded screw 5 is connected to the matching block 7. The matching block 7 and the base 1 are slidably connected. The top of the matching block 7 is fixed with a moving block 8, and both ends of the moving block 8 are fixed with a cylindrical rod 9. The external rotation of the cylindrical rod 9 is connected to the connecting bar 10; the angle adjustment mechanism also includes a first connecting seat 11, a first rotating shaft 12, a connecting plate 13, a second connecting seat 14 and a second rotating shaft 15. The first connecting seat 11 is fixed on both sides of the top of one end of the base 1. The two first connecting seats 11 are internally connected to a first rotating shaft 12. The first connecting seat 11 is fixed to the outside of the two first connecting seats 11. The external rotation of a rotating shaft 12 is connected to a connecting plate 13, and second connecting seats 14 are fixed on both sides of the bottom of one end of the connecting plate 13. The internal rotation of the two second connecting seats 14 is connected to the second rotating shaft 15, and the two connecting bars 10 are rotatably connected to the second rotating shaft 15; when the material conveying device is to be adjusted in angle according to actual needs, the first motor 4 is started, and the power output end of the first motor 4 drives the first threaded screw 5 to rotate, and the first threaded screw 5 drives the matching block 7 to slide inside the base 1, and the matching block 7 drives the moving block 8, and the moving block 8 drives the cylindrical rods 9 at both ends, and the cylindrical rod 9 drives the connecting bar 10 to rotate, and the connecting bar 10 drives the second rotating shaft 15, and the second rotating shaft 15 drives the second connecting seat 14, and the second connecting seat 14 drives the connecting plate 13 to rotate around the first rotating shaft 12. Through the rotation of the first rotating shaft 12, the angle adjustment of the connecting plate 13 is realized, thereby realizing the angle adjustment of the material conveying device;

[0035] The interior of the conveyor frame 2 is equipped with a conveying mechanism, which includes a second motor 23, a driving bevel gear 24, a driven bevel gear 25, a driving wheel 26, a driven wheel 27 and a conveyor belt 28. A second motor 23 is fixed to one side of one end of the conveyor frame 2, and a driving bevel gear 24 is fixed to the power output end of the second motor 23. The external meshing connection of the driving bevel gear 24 is connected to the driven bevel gear 25. One end of the conveyor frame 2 is internally connected to the driving wheel 26 for rotation. One end of the driving wheel 26 is fixed to the driven bevel gear 25. The other end of the conveyor frame 2 is internally connected to the driven wheel 27 for rotation. The driving wheel 26 and the driven wheel 27 are driven by a conveyor belt 28. The middle of the conveyor frame 2 is rotatably connected to a support The wheel 29 and the conveyor belt 28 are evenly distributed and fixed with multiple anti-slip protrusions 30 on the outside; when the material on the material conveying device is to be conveyed, the second motor 23 is started, and the power output end of the second motor 23 drives the active bevel gear 24 to rotate, and the active bevel gear 24 drives the driven bevel gear 25 to rotate, and the driven bevel gear 25 drives the active wheel 26 to rotate. The transmission between the active wheel 26 and the driven wheel 27 is through the conveyor belt 28. The support wheel 29 supports the conveyor belt 28 to prevent the middle part of the conveyor belt 28 from being concave due to excessive weight of the material and affecting the transportation of the material. The anti-slip protrusions 30 increase the friction effect to prevent the material from slipping during transportation, which is beneficial to the transportation of the material.

[0036] A protective cover 31 is fixed to one side of one end of the conveying frame 2 and located outside the second motor 23; the setting of the protective cover 31 protects the moving parts of the material conveying, which can effectively prevent people from being accidentally touched and injured, and can effectively reduce the occurrence of accidents;

[0037] A plurality of connecting columns 32 are fixed to the top of the connecting plate 13, the tops of the plurality of connecting columns 32 are fixed to the conveying frame 2, and self-locking universal wheels 33 are fixed to the four end corners of the bottom of the base 1; through the setting of the connecting columns 32, the connecting plate 13 and the conveying frame 2 are connected, and through the setting of the self-locking universal wheels 33, the material conveying device can be flexibly moved according to actual needs.

[0038] Example 2

[0039] Reference Figure 3 and Figure 4A new type of material conveying device, the limiting guide mechanism includes a second threaded screw 16, a second bearing 17, a rotating wheel 18, a mounting groove 19, a sliding rod 20, a limiting head 21 and a guide wheel 22. The internal thread of the limiting frame 3 is connected to the second threaded screw 16, one end of the second threaded screw 16 is fixed to the outside of the second bearing 17, the other end of the second threaded screw 16 is fixed to the rotating wheel 18, the outside of the second bearing 17 is fixed with a mounting groove 19, one side of the mounting groove 19 is fixed with two sliding rods 20, one end of the sliding rod 20 is fixed with a limiting head 21, and the two sliding rods 20 are both slidably connected to the limiting frame 3. There are multiple guide wheels 22 evenly distributed and connected in rotation inside the installation groove 19; when the material transported by the material conveying device needs to be limited and guided, the rotating wheel 18 is rotated, and the rotating wheel 18 drives the second threaded screw 16 to rotate, the second threaded screw 16 drives the second bearing 17, and the second bearing 17 drives the installation groove 19 to move. The installation groove 19 drives the two sliding rods 20 to slide inside the limit frame 3, and the limit head 21 controls the movable range of the installation groove 19. When the material contacts the guide wheel 22, the guide wheel 22 will rotate, thereby realizing the limited guidance of the transported material and preventing the material from falling from both sides and affecting the conveying efficiency.

[0040] The use process of a new material conveying device provided by the utility model is as follows:

[0041] When the material conveying device needs to be adjusted in angle according to actual needs, a first motor 4 is fixed inside one end of the base 1, a first screw rod 5 is fixed to the power output end of the first motor 4, a first bearing 6 is fixed to the outside of one end of the first screw rod 5, the first bearing 6 is fixed to the base 1, the external thread connection of the first screw rod 5 is connected with a matching block 7, the matching block 7 and the base 1 are slidably connected, a moving block 8 is fixed on the top of the matching block 7, a cylindrical rod 9 is fixed at both ends of the moving block 8, and a connecting strip 10 is connected to the outside of the cylindrical rod 9 for rotation; a first connecting seat 11 is fixed on both sides of the top of one end of the base 1, the two first connecting seats 11 are internally connected to a first rotating shaft 12, the first rotating shaft 12 is externally connected to a connecting plate 13, and the connecting plate 13 is connected to the outside of the connecting plate 13. A second connecting seat 14 is fixed on both sides of the bottom of one end, and the internal rotation of the two second connecting seats 14 is connected to the second rotating shaft 15, and the two connecting bars 10 are rotatably connected to the second rotating shaft 15; then the first motor 4 is started, and the power output end of the first motor 4 drives the first threaded screw 5 to rotate, and the first threaded screw 5 drives the matching block 7 to slide inside the base 1, and the matching block 7 drives the moving block 8, and the moving block 8 drives the cylindrical rods 9 at both ends, and the cylindrical rods 9 drive the connecting bar 10 to rotate, and the connecting bar 10 drives the second rotating shaft 15, and the second rotating shaft 15 drives the second connecting seat 14, and the second connecting seat 14 drives the connecting plate 13 to rotate around the first rotating shaft 12. Through the rotation of the first rotating shaft 12, the angle adjustment of the connecting plate 13 is realized, thereby realizing the angle adjustment of the material conveying device;

[0042] When the material transported by the material conveying device needs to be limited and guided, since the limiting frames 3 are fixed on both sides of the conveying frame 2, the internal thread of the limiting frame 3 is connected with a second threaded screw 16, and a second bearing 17 is fixed to the outside of one end of the second threaded screw 16, and a rotating wheel 18 is fixed to the outside of the second bearing 17. A mounting groove 19 is fixed to one side of the second bearing 17, and two sliding rods 20 are fixed on one side of the mounting groove 19, and a limiting head 21 is fixed at one end of the sliding rod 20, and the two sliding rods 20 are slidably connected to the limiting frame 3; then the rotating wheel 18 is rotated, and the rotating wheel 18 drives the second threaded screw 16 to rotate, the second threaded screw 16 drives the second bearing 17, and the second bearing 17 drives the mounting groove 19 to move, and the mounting groove 19 drives the two sliding rods 20 to slide inside the limiting frame 3, and the limiting head 21 controls the movable range of the mounting groove 19. When the material contacts the guide wheel 22, the guide wheel 22 will rotate, thereby realizing the limited guiding of the transported material and preventing the material from falling from both sides and affecting the conveying efficiency;

[0043] When the material on the material conveying device is to be conveyed, since a second motor 23 is fixed to one side of one end of the conveying frame 2, a driving bevel gear 24 is fixed to the power output end of the second motor 23, and the external meshing connection of the driving bevel gear 24 is connected to the driven bevel gear 25, one end of the conveying frame 2 is internally connected to the driving wheel 26, one end of the driving wheel 26 is fixed to the driven bevel gear 25, and the other end of the conveying frame 2 is internally connected to the driven wheel 27, and the driving wheel 26 and the driven wheel 27 are driven by a conveyor belt 28; thereby starting The second motor 23 is driven, and the power output end of the second motor 23 drives the driving bevel gear 24 to rotate, the driving bevel gear 24 drives the driven bevel gear 25 to rotate, and the driven bevel gear 25 drives the driving wheel 26 to rotate. The driving wheel 26 and the driven wheel 27 are transmitted through the conveyor belt 28. The support wheel 29 supports the conveyor belt 28 to prevent the middle part of the conveyor belt 28 from being concave due to excessive weight of the material and affecting the transportation of the material. The anti-slip protrusion 30 increases the friction effect to prevent the material from slipping during transportation, which is conducive to the transportation of the material.

[0044] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A new material conveying device, characterized in that: The invention comprises a base (1), a conveying frame (2) and a limiting frame (3); the top of the base (1) is equipped with the conveying frame (2); the tops of both sides of the conveying frame (2) are fixed with limiting frames (3); an angle adjustment mechanism is equipped between the base (1) and the conveying frame (2); and a limiting guide mechanism is equipped between the conveying frame (2) and the limiting frame (3); The angle adjustment mechanism comprises a first motor (4), a first threaded screw (5), a first bearing (6), a matching block (7), a moving block (8), a cylindrical rod (9) and a connecting strip (10); the first motor (4) is fixed inside one end of the base (1); the first threaded screw (5) is fixed to the power output end of the first motor (4); the first bearing (6) is fixed to the outside of one end of the first threaded screw (5); the first bearing (6) and the base (1) are fixed; the external thread of the first threaded screw (5) is connected to the matching block (7); the matching block (7) and the base (1) are slidably connected; the top of the matching block (7) is fixed with a moving block (8); the two ends of the moving block (8) are fixed with a cylindrical rod (9); the external rotation of the cylindrical rod (9) is connected to the connecting strip (10).

2. A novel material conveying device according to claim 1, characterized in that: The angle adjustment mechanism further comprises a first connecting seat (11), a first rotating shaft (12), a connecting plate (13), a second connecting seat (14) and a second rotating shaft (15); the first connecting seat (11) is fixed on both sides of the top of one end of the base (1); the two first connecting seats (11) are internally rotatably connected to a first rotating shaft (12); the first rotating shaft (12) is externally rotatably connected to a connecting plate (13); the second connecting seat (14) is fixed on both sides of the bottom of one end of the connecting plate (13); the two second connecting seats (14) are internally rotatably connected to the second rotating shaft (15); and the two connecting bars (10) are rotatably connected to the second rotating shaft (15).

3. A novel material conveying device according to claim 1, characterized in that: The limiting guide mechanism comprises a second threaded screw (16), a second bearing (17), a rotating wheel (18), a mounting groove (19), a sliding rod (20), a limiting head (21) and a guide wheel (22); the internal thread of the limiting frame (3) is connected to the second threaded screw (16); one end of the second threaded screw (16) is externally fixed with a second bearing (17); the other end of the second threaded screw (16) is fixed with a rotating wheel (18); the outside of the second bearing (17) is fixed with a mounting groove (19); two sliding rods (20) are fixed on one side of the mounting groove (19); one end of the sliding rod (20) is fixed with a limiting head (21); the two sliding rods (20) are both slidably connected to the limiting frame (3); and a plurality of guide wheels (22) are evenly distributed and rotatably connected inside the mounting groove (19).

4. A novel material conveying device according to claim 1, characterized in that: The conveying frame (2) is internally equipped with a conveying mechanism, which comprises a second motor (23), a driving bevel gear (24), a driven bevel gear (25), a driving wheel (26), a driven wheel (27) and a conveyor belt (28). The second motor (23) is fixed to one side of one end of the conveying frame (2), the power output end of the second motor (23) is fixed to the driving bevel gear (24), the external meshing connection of the driving bevel gear (24) is connected to the driven bevel gear (25), one end of the conveying frame (2) is internally connected to the driving wheel (26), one end of the driving wheel (26) is fixed to the driven bevel gear (25), the other end of the conveying frame (2) is internally connected to the driven wheel (27), and the driving wheel (26) and the driven wheel (27) are driven by the conveyor belt (28).

5. A novel material conveying device according to claim 4, characterized in that: The middle of the conveying frame (2) is rotatably connected to a support wheel (29), and the outside of the conveyor belt (28) is evenly distributed and fixed with a plurality of anti-slip protrusions (30).

6. A novel material conveying device according to claim 4, characterized in that: A protective cover (31) is fixed on one side of one end of the conveying frame (2) and located outside the second motor (23).

7. A novel material conveying device according to claim 2, characterized in that: A plurality of connecting columns (32) are fixed on the top of the connecting plate (13), the tops of the plurality of connecting columns (32) are fixed to the conveying frame (2), and self-locking universal wheels (33) are fixed on the four end corners of the bottom of the base (1).

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