Building powder material processing device

Abstract

The utility model relates to the related technical field of building material processing, in particular to a building powder material processing device, which comprises a moving box, a material storage box is arranged on one side of the top of the moving box, a material adding opening is formed in the top of the material storage box, a material discharging opening is formed in the bottom of the material storage box, supporting plates are fixedly connected to the two faces of the bottom of the material storage box, and the bottoms of the supporting plates are fixedly connected with the moving box. Under the cooperative action of the moving box, the storage box, the feeding port, the discharging port, the supporting plate, the first rotating shaft, the rectangular frame, the screen and the quantifying mechanism, the device can achieve the automatic quantitative discharging function, and the situation that building powder in the storage box is accumulated on the screen is avoided; the problems that an existing building powder material processing device does not have the automatic quantitative discharging function, a large amount of building powder is accumulated in the device, a screen is prone to being blocked, and the screening effect is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field related to building material processing, in particular to a building powder material processing device. Background Art

[0002] Accommodation is inseparable from housing. my country is a country with a large population in the world. In order to solve people's housing and transportation problems, many new buildings are built every year. The more new buildings are built, the more construction waste will be generated when they reach the end of their service life. If these demolished construction waste is used properly, it will be a huge wealth and will bring huge income to the development of society and cities. On the contrary, it will become a burden on urban development and become the culprit of environmental pollution. According to the concept of circular economy, it is feasible to use construction waste as raw materials.

[0003] The utility model patent, issued with announcement number CN220215771U, discloses a construction powder material processing device, belonging to the technical field related to construction material processing. The device addresses the problem that construction waste is typically crushed into powder for use as filling material, but the crushed material has different sizes due to different crushing effects. The device comprises a screening box with a support frame at the bottom. The screening box is provided with a sieve plate assembly for graded screening. The sieve plate assembly comprises a first sieve plate, a second sieve plate, and a guide plate. The first sieve plate, the second sieve plate, and the guide plate are evenly spaced from top to bottom between the inner walls of the support frame. The first sieve plate, the second sieve plate, and the guide plate are all arranged in an inclined manner, and the lower ends of the first sieve plate, the second sieve plate, and the guide plate are rotatably connected to the inner walls of the screening box. In this utility model, the inclined sieve plates, the second sieve plate, and the guide plate perform graded filtering of the material, enabling the classified collection of materials of different sizes, improving material utilization efficiency, and facilitating the selection of materials of different sizes according to different situations, thereby expanding the range of material applications.

[0004] However, the above patent still has shortcomings: although the patent can grade and screen construction powder, it does not have the function of automatic quantitative feeding, resulting in a large amount of construction powder accumulating inside the device, which easily causes the screen to be blocked, thereby affecting the screening effect. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a construction powder material processing device to solve the problem that the existing construction powder material processing device proposed in the above background technology does not have the function of automatic quantitative unloading, resulting in a large amount of construction powder accumulating inside the device, which easily causes the screen to be blocked, thereby affecting the screening effect.

[0006] The technical solution of the utility model is:

[0007] A construction powder material processing device comprises: a moving box; a storage box is provided on one side of the top of the moving box, a feeding port is provided on the top of the storage box, a discharge port is provided on the bottom of the storage box, support plates are fixedly connected to both sides of the bottom of the storage box, the bottoms of the support plates are fixedly connected to the moving box, a first rotating shaft is provided inside the discharge port, a rectangular frame is provided on the moving box near the discharge port, a screen is provided inside the rectangular frame; a quantitative mechanism is provided on the outer surface of the first rotating shaft located inside the discharge port to prevent a large amount of construction powder from accumulating on the screen; a rotating mechanism for controlling the reciprocating horizontal movement of the rectangular frame is provided on one side of the rectangular frame; a conveying mechanism for transporting the screened construction materials is provided at the bottom of the rectangular frame.

[0008] Preferably, the quantitative mechanism includes: a quantitative wheel is fixedly connected to the outer surface of the first rotating shaft, and four quantitative grooves are evenly opened on the outer surface of the quantitative wheel; one end of the first rotating shaft is rotatably connected to the support plate, and the other end of the first rotating shaft passes through the support plate and extends to the groove wheel, the groove wheel is fixedly connected to the first rotating shaft, and a corresponding limiting wheel is provided on one side of the groove wheel, one side of the limiting wheel is fixedly connected to a circular plate, the top of the circular plate is fixedly connected to a connecting block, one side of the connecting block is fixedly connected to a cylindrical block, and the connecting block and the cylindrical block are adapted to the groove wheel.

[0009] Preferably, the rotating mechanism includes: a fixed block fixedly connected to one side of the rectangular frame, the internal rotation of the fixed block is connected to the second rotating shaft, the top end of the second rotating shaft is fixedly connected to a linkage rod, and the end of the linkage rod away from the second rotating shaft is fixedly connected to the third rotating shaft; the top end of the third rotating shaft is rotatably connected to a rotating plate, the center of the rotating plate is fixedly connected to a fourth rotating shaft, the top end of the fourth rotating shaft passes through the fixed plate and extends to the first motor, the first motor is fixedly connected to the support plate, the fixed plate is fixedly connected to the movable box, and the fourth rotating shaft is fixedly connected to the output end of the first motor.

[0010] Preferably, the conveying mechanism includes: a conveyor belt is provided at the bottom of the rectangular frame, a driving shaft is provided on the inner side of the conveyor belt, a driven shaft is provided on one side of the driving shaft, and the outer surfaces of the driving shaft and the driven shaft located at the conveyor belt are fixedly connected to conveying rollers; both ends of the driven shaft are rotatably connected to the moving box, the moving box is fixedly connected to a second motor near the driving shaft, the driving shaft is fixedly connected to the second motor, and the end of the driving shaft away from the second motor passes through the moving box and extends to the outside of the moving box; the end of the driving shaft located at the outside of the moving box is provided with a linkage mechanism for controlling the synchronous rotation of the circular plate and the driving shaft.

[0011] Preferably, the linkage mechanism includes: the driving shaft is fixedly connected to a first synchronous wheel at one end located outside the movable box, and the first synchronous wheel is connected to a second synchronous wheel through a synchronous belt; the center of the second synchronous wheel is fixedly connected to a fifth rotating shaft, and the fifth rotating shaft passes through the fixed frame away from the end of the second synchronous wheel and extends to the circular plate, the circular plate is fixedly connected to the fifth rotating shaft, and the fixed frame is fixedly connected to the support plate.

[0012] Preferably, two rollers are provided on both sides of the bottom of the rectangular frame, the centers of the rollers are rotatably connected to a sixth rotating shaft, and one end of the sixth rotating shaft away from the rollers is fixedly connected to the moving box.

[0013] Preferably, universal wheels with braking function are provided at the four corners of the bottom of the moving box, and the universal wheels are fixedly connected to the moving box.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Firstly, the utility model can realize the function of automatic quantitative unloading of materials through the cooperation of the movable box, the storage box, the feeding port, the discharging port, the support plate, the first rotating shaft, the rectangular frame, the screen and the quantitative mechanism, thereby avoiding the situation where the construction powder inside the storage box accumulates on the screen, and solves the problem that the existing construction powder material processing device does not have the function of automatic quantitative unloading, resulting in a large amount of construction powder accumulating inside the device, which easily causes the screen to be blocked, thereby affecting the screening effect.

[0016] Secondly, the utility model can separate larger impurities in the building powder through the coordinated action of the mobile box, storage box, feeding port, discharge port, support plate, first rotating shaft, rectangular frame, screen, rotating mechanism and conveying mechanism, and automatically convey the screened building powder, thereby avoiding the presence of larger impurities in the building powder, which affects the use effect of the building powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a building powder material processing device of the present utility model;

[0018] Figure 2 This is a side sectional structural diagram of a construction powder material processing device of the present invention;

[0019] Figure 3 This is a schematic diagram of the quantitative mechanism structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the rotating mechanism structure of the utility model;

[0021] Figure 5 For the utility model Figure 4 A in the middle is an enlarged structural diagram;

[0022] Figure 6 This is a schematic diagram of the conveying mechanism structure of the present utility model.

[0023] In the picture:

[0024] 1. Moving box; 2. Storage box; 3. Feeding port; 4. Discharging port; 5. Support plate; 6. First rotating shaft; 7. Rectangular frame; 8. Screen; 9. Dosing mechanism; 10. Rotating mechanism; 11. Conveying mechanism; 12. Dosing wheel; 13. Dosing slot; 14. Grooved wheel; 15. Limiting wheel; 16. Circular plate; 17. Connecting block; 18. Cylindrical block; 19. Fixed block; 20. Second rotating shaft; 21. Linkage rod; 2 2. Third rotating shaft; 23. Rotating plate; 24. Fourth rotating shaft; 25. Fixed plate; 26. First motor; 27. Conveyor belt; 28. Driving shaft; 29. Driven shaft; 30. Conveyor roller; 31. Second motor; 32. Linkage mechanism; 33. First synchronous wheel; 34. Synchronous belt; 35. Second synchronous wheel; 36. Fifth rotating shaft; 37. Fixed frame; 38. Roller; 39. Sixth rotating shaft; 40. Universal wheel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1 to 6 The present invention describes the above technical solution in detail through the following embodiments:

[0027] A construction powder material processing device comprises: a mobile box 1; a storage box 2 is provided on one side of the top of the mobile box 1, a feeding port 3 is provided on the top of the storage box 2, a discharge port 4 is provided at the bottom of the storage box 2, support plates 5 are fixedly connected to both sides of the bottom of the storage box 2, the bottoms of the support plates 5 are fixedly connected to the mobile box 1, a first rotating shaft 6 is provided inside the discharge port 4, a rectangular frame 7 is provided near the discharge port 4 of the mobile box 1, a screen 8 is provided inside the rectangular frame 7; a quantitative mechanism 9 is provided on the outer surface of the first rotating shaft 6 located inside the discharge port 4 to prevent a large amount of construction powder from accumulating on the screen 8; a rotary mechanism for controlling the reciprocating horizontal movement of the rectangular frame 7 is provided on one side of the rectangular frame 7. Rotating mechanism 10; a conveying mechanism 11 for transporting the screened building materials is provided at the bottom of the rectangular frame 7. The user pours the building powder into the storage box 2 through the feeding port 3, and then starts the conveying mechanism 11 and the rotating mechanism 10. The conveying mechanism 11 drives the first rotating shaft 6 to rotate intermittently while running. The first rotating shaft 6 cooperates with the quantitative mechanism 9 and the discharge port 4, so that the building powder falls onto the screen 8 in a quantitative manner. At the same time, the rotating mechanism 10 controls the screen 8 to move horizontally back and forth inside the mobile box 1, so that the building powder falls onto the conveying mechanism 11 through the sieve holes on the screen 8, and the conveying mechanism 11 transports the screened building powder.

[0028] like Figure 3 As shown, the quantitative mechanism 9 includes: a quantitative wheel 12 is fixedly connected to the outer surface of the first rotating shaft 6, and four quantitative grooves 13 are evenly opened on the outer surface of the quantitative wheel 12; one end of the first rotating shaft 6 is rotatably connected to the support plate 5, and the other end of the first rotating shaft 6 passes through the support plate 5 and extends to the groove wheel 14, the groove wheel 14 is fixedly connected to the first rotating shaft 6, and a matching limiting wheel 15 is provided on one side of the groove wheel 14, and a circular plate 16 is fixedly connected to one side of the limiting wheel 15, and a connecting block 17 is fixedly connected to the top of the circular plate 16, and a cylindrical block 18 is fixedly connected to one side of the connecting block 17. 7 and the cylindrical block 18 are adapted to the groove wheel 14. The circular plate 16 rotates while driving the connecting block 17 and the limiting wheel 15, so that the connecting block 17 performs a turnover motion. The connecting block 17 drives the cylindrical block 18 while rotating. The cooperation of the cylindrical block 18 and the limiting wheel 15 causes the groove wheel 14 to rotate 90 degrees. When the groove wheel 14 rotates, it drives the first rotating shaft 6. The first rotating shaft 6 drives the quantitative wheel 12, so that the quantitative wheel 12 produces an intermittent rotation of 90 degrees. The purpose of quantitative discharge of the building powder inside the storage box 2 is carried out through the cooperation of the quantitative groove 13 on the surface of the quantitative wheel 12 and the discharge port 4.

[0029] like Figure 2 and Figure 4As shown, the rotating mechanism 10 includes: a fixed block 19 is fixedly connected to one side of the rectangular frame 7, the interior of the fixed block 19 is rotatably connected to the second rotating shaft 20, the top of the second rotating shaft 20 is fixedly connected to the linkage rod 21, and the end of the linkage rod 21 away from the second rotating shaft 20 is fixedly connected to the third rotating shaft 22; the top of the third rotating shaft 22 is rotatably connected to the rotating plate 23, and the center of the rotating plate 23 is fixedly connected to the fourth rotating shaft 24, the top of the fourth rotating shaft 24 passes through the fixed plate 25 and extends to the first motor 26, the first motor 26 is fixedly connected to the support plate 5, and the fixed plate 25 is fixedly connected to the mobile box 1, the fourth rotating shaft 24 is fixedly connected to the output end of the first motor 26, the first motor 26 is started, the output end of the first motor 26 drives the fourth rotating shaft 24, the fourth rotating shaft 24 drives the rotating plate 23, the rotating plate 23 drives the third rotating shaft 22 to rotate, and while the third rotating shaft 22 rotates, it drives one end of the linkage rod 21 so that the other end of the linkage rod 21 drives the fixed block 19 through the second rotating shaft 20, the fixed block 19 drives the rectangular frame 7, and the rectangular frame 7 drives the screen 8 to perform reciprocating horizontal motion, thereby screening the building powder on the screen 8.

[0030] like Figure 6 As shown, the conveying mechanism 11 includes: a conveyor belt 27 is provided at the bottom of the rectangular frame 7, a driving shaft 28 is provided on one side of the inner side of the conveyor belt 27, and a driven shaft 29 is provided on one side of the driving shaft 28. The outer surfaces of the driving shaft 28 and the driven shaft 29 located at the conveyor belt 27 are fixedly connected to conveying rollers 30; both ends of the driven shaft 29 are rotatably connected to the moving box 1, and the moving box 1 is fixedly connected to a second motor 31 near the driving shaft 28. The driving shaft 28 is fixedly connected to the second motor 31, and the end of the driving shaft 28 away from the second motor 31 passes through the moving box 1 and extends to the outside of the moving box 1; the end of the driving shaft 28 located outside the moving box 1 is provided with a linkage mechanism 32 for controlling the synchronous rotation of the circular plate 16 and the driving shaft 28. When the second motor 31 is started, the output end of the second motor 31 drives the driving shaft 28 to rotate. While the driving shaft 28 rotates, the conveyor belt 27 is driven by the cooperation of the driven shaft 29 and the conveying roller 30, so that the conveyor belt 27 can transport the screened building powder.

[0031] like Figure 1 and Figure 6As shown, the linkage mechanism 32 includes: the driving shaft 28 is fixedly connected to the first synchronous wheel 33 at one end outside the moving box 1, and the first synchronous wheel 33 is connected to the second synchronous wheel 35 through a synchronous belt 34; the center of the second synchronous wheel 35 is fixedly connected to the fifth rotating shaft 36, and the fifth rotating shaft 36 passes through the fixed frame 37 away from the end of the second synchronous wheel 35 and extends to the circular plate 16. The circular plate 16 is fixedly connected to the fifth rotating shaft 36, and the fixed frame 37 is fixedly connected to the support plate 5. When the driving shaft 28 rotates, it drives the first synchronous wheel 33. The first synchronous wheel 33 drives the second synchronous wheel 35 through the synchronous belt 34. The second synchronous wheel 35 drives the fifth rotating shaft 36, so that the fifth rotating shaft 36 rotates inside the fixed frame 37 while driving the circular plate 16.

[0032] like Figure 4 and Figure 5 As shown, two rollers 38 are provided on both sides of the bottom of the rectangular frame 7, and the centers of the rollers 38 are rotatably connected to the sixth rotating shaft 39. The ends of the sixth rotating shaft 39 away from the rollers 38 are fixedly connected to the moving box 1. The cooperation of the rollers 38 and the sixth rotating shaft 39 can enable the rectangular frame 7 to perform flexible horizontal reciprocating movement inside the moving box 1.

[0033] like Figure 1 As shown, universal wheels 40 with braking function are provided at the four corners of the bottom of the moving box 1, and the universal wheels 40 are fixedly connected to the moving box 1, making it convenient for users to move and fix the device.

[0034] Working principle: The user pours the building powder into the storage box 2 through the feeding port 3, and then starts the second motor 31. The output end of the second motor 31 drives the driving shaft 28 to rotate. The driving shaft 28 drives the first synchronous wheel 33 while rotating. The first synchronous wheel 33 drives the second synchronous wheel 35 through the synchronous belt 34. The second synchronous wheel 35 drives the fifth rotating shaft 36, so that the fifth rotating shaft 36 rotates inside the fixed frame 37 and drives the circular plate 16. The circular plate 16 rotates while driving the connecting block 17 and the limiting wheel 15, so that the connecting block 17 performs a turnover motion. The connecting block 17 drives the cylindrical block 18 while rotating. The cooperation of the cylindrical block 18 and the limiting wheel 15 makes The groove wheel 14 rotates 90 degrees, and the groove wheel 14 drives the first rotating shaft 6 while rotating, and the first rotating shaft 6 drives the metering wheel 12, so that the metering wheel 12 produces an intermittent rotation of 90 degrees. The metering groove 13 on the surface of the metering wheel 12 cooperates with the discharge port 4 to quantitatively discharge the building powder inside the storage box 2. The device can realize the function of automatic quantitative discharge, avoiding the situation that the building powder inside the storage box 2 accumulates on the screen 8, and solves the problem that the existing building powder material processing device does not have the function of automatic quantitative discharge, resulting in a large amount of building powder accumulating inside the device, which easily causes the screen 8 to be blocked, thereby affecting the screening effect.

[0035] The first motor 26 is started, and the output end of the first motor 26 drives the fourth rotating shaft 24, and the fourth rotating shaft 24 drives the rotating plate 23, and the rotating plate 23 drives the third rotating shaft 22 to rotate. While the third rotating shaft 22 rotates, it drives one end of the linkage rod 21 so that the other end of the linkage rod 21 drives the fixed block 19 through the second rotating shaft 20, and the fixed block 19 drives the rectangular frame 7. The rectangular frame 7 is moved back and forth horizontally through the cooperation of the roller 38 and the sixth rotating shaft 39, and the rectangular frame 7 drives the screen 8 to move back and forth horizontally, thereby screening the building powder on the screen 8. At the same time, while the driving shaft 28 rotates, it drives the conveyor belt 27 through the cooperation of the driven shaft 29 and the conveying roller 30, so that the conveyor belt 27 conveys the screened building powder. The purpose is to enable the device to separate larger impurities in the building powder and automatically convey the screened building powder, thereby avoiding the construction powder containing larger impurities, thereby affecting the use effect of the construction powder.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction powder material processing device, comprising: Moving box (1); It is characterized in that a storage box (2) is provided on one side of the top of the movable box (1), a feeding port (3) is provided on the top of the storage box (2), a discharge port (4) is provided on the bottom of the storage box (2), support plates (5) are fixedly connected to both sides of the bottom of the storage box (2), the bottoms of the support plates (5) are fixedly connected to the movable box (1), a first rotating shaft (6) is provided inside the discharge port (4), a rectangular frame (7) is provided on the movable box (1) near the discharge port (4), and a screen (8) is provided inside the rectangular frame (7); The outer surface of the first rotating shaft (6) located inside the discharge port (4) is provided with a quantitative mechanism (9) for preventing a large amount of building powder from accumulating on the screen (8); A rotating mechanism (10) for controlling the rectangular frame (7) to move back and forth horizontally is provided on one side of the rectangular frame (7); A conveying mechanism (11) for transporting the screened building materials is provided at the bottom of the rectangular frame (7).

2. A construction powder material processing device according to claim 1, characterized in that: The quantitative mechanism (9) comprises: A dosing wheel (12) is fixedly connected to the outer surface of the first rotating shaft (6), and four dosing grooves (13) are evenly arranged on the outer surface of the dosing wheel (12); One end of the first rotating shaft (6) is rotatably connected to the support plate (5), and the other end of the first rotating shaft (6) passes through the support plate (5) and extends to the groove wheel (14). The groove wheel (14) is fixedly connected to the first rotating shaft (6). A matching limiting wheel (15) is provided on one side of the groove wheel (14). A circular plate (16) is fixedly connected to one side of the limiting wheel (15). A connecting block (17) is fixedly connected to the top of the circular plate (16). A cylindrical block (18) is fixedly connected to one side of the connecting block (17). The connecting block (17) and the cylindrical block (18) are matched with the groove wheel (14).

3. A construction powder material processing device according to claim 1, characterized in that: The rotating mechanism (10) comprises: A fixed block (19) is fixedly connected to one side of the rectangular frame (7), a second rotating shaft (20) is rotatably connected to the interior of the fixed block (19), a linkage rod (21) is fixedly connected to the top end of the second rotating shaft (20), and a third rotating shaft (22) is fixedly connected to the end of the linkage rod (21) away from the second rotating shaft (20); The top end of the third rotating shaft (22) is rotatably connected to a rotating plate (23), the center of the rotating plate (23) is fixedly connected to a fourth rotating shaft (24), the top end of the fourth rotating shaft (24) passes through the fixed plate (25) and extends to the first motor (26), the first motor (26) is fixedly connected to the support plate (5), the fixed plate (25) is fixedly connected to the moving box (1), and the fourth rotating shaft (24) is fixedly connected to the output end of the first motor (26).

4. A construction powder material processing device according to claim 1, characterized in that: The conveying mechanism (11) comprises: A conveyor belt (27) is provided at the bottom of the rectangular frame (7), a driving shaft (28) is provided on one side of the inner portion of the conveyor belt (27), a driven shaft (29) is provided on one side of the driving shaft (28), and a conveyor roller (30) is fixedly connected to the outer surfaces of the driving shaft (28) and the driven shaft (29) located at the conveyor belt (27); Both ends of the driven shaft (29) are rotatably connected to the moving box (1); a second motor (31) is fixedly connected to the moving box (1) near the driving shaft (28); the driving shaft (28) is fixedly connected to the second motor (31); an end of the driving shaft (28) away from the second motor (31) passes through the moving box (1) and extends to the outside of the moving box (1); One end of the driving shaft (28) located outside the moving box (1) is provided with a linkage mechanism (32) for controlling the circular plate (16) and the driving shaft (28) to rotate synchronously.

5. A construction powder material processing device according to claim 4, characterized in that: The linkage mechanism (32) comprises: One end of the driving shaft (28) located outside the moving box (1) is fixedly connected to a first synchronous wheel (33), and the first synchronous wheel (33) is connected to a second synchronous wheel (35) via a synchronous belt (34); The center of the second synchronous wheel (35) is fixedly connected to a fifth rotating shaft (36); one end of the fifth rotating shaft (36) away from the second synchronous wheel (35) passes through a fixing frame (37) and extends to a circular plate (16); the circular plate (16) is fixedly connected to the fifth rotating shaft (36); and the fixing frame (37) is fixedly connected to the support plate (5).

6. A construction powder material processing device according to claim 1, characterized in that: Two rollers (38) are provided on both sides of the bottom of the rectangular frame (7), the centers of the rollers (38) are rotatably connected to a sixth rotating shaft (39), and one end of the sixth rotating shaft (39) away from the rollers (38) is fixedly connected to the moving box (1).

7. A construction powder material processing device according to claim 1, characterized in that: Universal wheels (40) with a braking function are provided at the four corners of the bottom of the moving box (1), and the universal wheels (40) are fixedly connected to the moving box (1).

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