Flying dust treatment equipment

Abstract

The utility model provides flying dust treatment equipment, and relates to the technical field of flying dust treatment equipment. Comprising a bottom plate; the universal wheels are positioned below the bottom plate; the handle is positioned above the bottom plate; the spraying equipment is connected with the upper surface of the bottom plate; the spraying equipment comprises a height adjusting assembly, a direction adjusting assembly, a spraying head connecting assembly, a water tank and a spraying head; the spray header connecting assembly comprises a mounting shell, and the bottom of the mounting shell is connected with the height adjusting assembly; quick replacement assemblies are arranged on the two sides of the mounting shell; the bottom face of the mounting shell is fixedly connected with the height adjusting assembly. The rear end face of the mounting shell is connected with the water tank through a water pipe. A mounting rod is arranged at the bottom of the spraying head; the mounting rod is fixedly connected with the bottom of the spraying head, and a clamping groove is formed in the mounting rod and connected with the mounting shell in a clamped mode. The quick replacement assembly is arranged in the mounting shell, and the mounting rod which can be clamped with the mounting shell is arranged at the bottom of the spray head, so that quick replacement of the spray head is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of dust control equipment, in particular to dust control equipment. Background Art

[0002] Construction sites are the main source of urban dust pollution. Since the road surface is hardened and lacks vegetation cover, the soil is directly exposed. Dust is blown into the atmosphere by wind, human influence and other factors, forming an open pollution source. It is an important component of the total suspended particulate matter in the ambient air. In particular, a large amount of dust is often accumulated on the prefabricated cement roads for vehicles on construction sites. Under the action of wind, the dust floats in the air, which can easily pose a threat to the respiratory health of construction workers. Therefore, a dust control equipment is needed.

[0003] Dust control equipment refers to equipment that can effectively control and reduce dust emissions generated during construction, industrial production or other activities. These equipment are designed to reduce the concentration of particulate matter in the air, thereby reducing the level of air pollution and protecting the environment and human health.

[0004] However, the dust control equipment in the prior art cannot quickly replace the sprinkler head. When the sprinkler head is damaged or blocked, the sprinkler system cannot work normally, resulting in a decrease in the dust control effect, which will increase the dust concentration in the environment and increase the risk of air pollution. Utility Model Content

[0005] The utility model provides a dust control device, which solves the technical problem that when the spray head of the existing dust control device is damaged or blocked, the spray head cannot be quickly replaced, resulting in a decrease in the dust control effect.

[0006] To solve the above technical problems, the technical solution of this novel invention is as follows:

[0007] A dust control device, comprising:

[0008] Base plate;

[0009] a universal wheel located below the bottom plate, and a handle located above the bottom plate;

[0010] A spray device connected to the upper surface of the base plate;

[0011] The spraying equipment includes a height adjustment component, a direction adjustment component, a spray head connection component, a water tank and a spray head;

[0012] The shower head connection assembly includes a mounting shell, and the bottom of the mounting shell is connected to the height adjustment assembly;

[0013] Quick-change components are provided on both sides of the mounting shell;

[0014] The bottom surface of the mounting shell is fixedly connected to the height adjustment assembly, and the rear end surface of the mounting shell is connected to the water tank through a water pipe;

[0015] A mounting rod is provided at the bottom of the spray head;

[0016] The mounting rod is fixedly connected to the bottom of the sprinkler head, and a clamping groove is arranged on the mounting rod and is clamped with the mounting shell.

[0017] Optionally, the quick-change assembly includes push rods arranged on both sides of the mounting shell;

[0018] The push rod passes through the side of the mounting shell and is connected to the push plate at one end and to the connecting plate at the other end;

[0019] The connecting plate is sleeved on the end of the slide rod, one end of the slide rod away from the connecting plate is fixedly connected to the baffle, and the baffle is fixedly connected to the mounting shell;

[0020] A spring is sleeved on the slide bar and is located between the connecting plate and the baffle.

[0021] Optionally, the quick-change assembly further includes a connecting block;

[0022] The two ends of the connecting plate are connected to the connecting block through a rotating rod.

[0023] One end of the connecting block is fixedly connected to the side of the clamping block, and the clamping block is sleeved on a support rod fixedly connected to the inner surface of the mounting shell;

[0024] The support rod is arranged perpendicularly to the push rod.

[0025] Optionally, a through hole is formed on the rear end surface of the mounting shell, and the distance between the two support rods connected to the same quick-change assembly is greater than the diameter of the through hole;

[0026] The diameter of the mounting rod is smaller than the diameter of the through hole, and the mounting rod can be engaged with the clamping block.

[0027] Optionally, the height adjustment assembly includes a box;

[0028] A threaded rod is provided in the box body, one end of the threaded rod is fixedly connected to the bottom of the lifting rod, and the other end is rotatably connected to the center of the worm gear;

[0029] The worm wheel is meshingly connected with the worm, and a rotating disk is arranged on the side of the worm;

[0030] The top of the lifting rod is fixedly connected to the bottom of the mounting shell.

[0031] Optionally, a limit block is provided on the side of the lifting rod, and the limit block is located inside the box body;

[0032] A limiting plate is arranged on the top of the box body, the limiting plate and the limiting block are on the same straight line, and the limiting block slides in the limiting plate.

[0033] Optionally, a scale plate is provided on the side of the box body.

[0034] Optionally, the direction adjustment component includes a connection disk, and the box body is arranged on the connection disk;

[0035] The bottom of the connecting plate is fixedly connected to one end of a connecting rod, and the other end of the connecting rod passes through the box body and the connecting plate and is connected to the motor.

[0036] Optionally, a groove is formed on the bottom plate;

[0037] The connecting disk and the motor are both arranged in the groove.

[0038] Optionally, a locking device is provided on the universal wheel.

[0039] The above solution of the utility model includes at least the following beneficial effects:

[0040] The above scheme of the utility model includes: a base plate; a universal wheel located below the base plate, a handle located above the base plate; a spray device connected to the upper surface of the base plate; the spray device includes a height adjustment component, a direction adjustment component, a spray head connection component, a water tank and a spray head; the spray head connection component includes a mounting shell, the bottom of the mounting shell is connected to the height adjustment component; quick-change components are arranged on both sides of the mounting shell; the bottom surface of the mounting shell is fixedly connected to the height adjustment component, and the rear end surface of the mounting shell is connected to the water tank through a water pipe; a mounting rod is arranged at the bottom of the spray head; the mounting rod is fixedly connected to the bottom of the spray head, and a card slot is arranged on the mounting rod, which is carded with the mounting shell. The technical scheme of the utility model, through the rotation of the motor in the direction adjustment component, drives the height adjustment component, the spray head connection component and the spray head arranged on the direction adjustment component to rotate, so as to adjust the angle of the spray head. The height of the spray head connection component of the height adjustment component plays a role in adjusting the height of the spray head. By arranging a quick-change component in the mounting shell and arranging a mounting rod capable of being snap-connected with the mounting shell at the bottom of the spray head, quick replacement of the spray head is achieved, thereby avoiding a decrease in dust control effect due to the inability to quickly replace the spray head when the spray head is damaged or blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A three-dimensional diagram of a dust control device of the utility model;

[0042] Figure 2 This is a schematic diagram of the structure of a direction adjustment component of a dust control device of the utility model;

[0043] Figure 3 This is a schematic diagram of the structure of a height adjustment component of a dust control device of the utility model;

[0044] Figure 4 This is a schematic diagram of the structure of a sprinkler head connection assembly of a dust control device of the utility model;

[0045] Figure 5 A schematic diagram of the structure of a sprinkler head of a dust control device of the utility model;

[0046] Figure 6 for Figure 4 Enlarged schematic diagram at point A in the middle.

[0047] Description of reference numerals:

[0048] 1. Bottom plate; 2. Universal wheel; 3. Handle; 4. Water tank; 5. Water pipe; 6. Motor; 7. Connecting rod; 8. Connecting plate; 9. Box; 10. Turntable; 11. Worm; 12. Worm wheel; 13. Threaded rod; 14. Lifting rod; 15. Limit block; 16. Limit plate; 17. Mounting shell; 18. Sprinkler head; 19. Mounting rod; 20. Push plate; 21. Push rod; 22. Connecting plate; 23. Turning rod; 24. Connecting block; 25. Block; 26. Support rod; 27. Sliding rod; 28. Spring; 29. ​​Baffle; 30. Slot; 31. Scale plate. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] like Figure 1 , Figure 2 and Figure 5 As shown, an embodiment of the utility model provides a dust control device, comprising:

[0051] Bottom plate 1;

[0052] A universal wheel 2 is located below the bottom plate 1, and a handle 3 is located above the bottom plate 1;

[0053] A spraying device connected to the upper surface of the base plate 1;

[0054] The spraying equipment includes a height adjustment component, a direction adjustment component, a spray head connection component, a water tank 4 and a spray head 18;

[0055] The shower head connection assembly includes a mounting shell 17, and the bottom of the mounting shell 17 is connected to the height adjustment assembly;

[0056] The mounting shell 17 is provided with quick-change components on both sides;

[0057] The bottom surface of the mounting shell 17 is fixedly connected to the height adjustment assembly, and the rear end surface of the mounting shell 17 is connected to the water tank 4 through the water pipe 5;

[0058] A mounting rod 19 is provided at the bottom of the spray head 18;

[0059] The mounting rod 19 is fixedly connected to the bottom of the sprinkler head 18 . A clamping groove 30 is provided on the mounting rod 19 and is clamped with the mounting shell 17 .

[0060] In the above embodiment, a plurality of evenly distributed universal wheels 2 are provided below the base plate 1 to facilitate the movement of the dust control equipment, and a handle 3 is provided above the base plate 1 to facilitate the pushing of the dust control equipment. A groove is provided on the upper surface of the base plate 1, and the direction adjustment component is provided in the groove. A height adjustment component is provided above the direction adjustment component, and the top of the height adjustment component is fixedly connected to the spray head connection component. The front end surface of the mounting shell 17 is engaged with the mounting rod 19 provided at the bottom of the spray head 18, thereby fixing the spray head 18. The spray head 18 is used to spray clean water to reduce dust. A water pump is provided in the water tank 4, and the water pipe 5 connecting the mounting shell 17 and the water tank 4 is a hose, which ensures that water can flow from the water tank 4 into the spray head 18 when the spray head connection component rotates and moves up and down.

[0061] The technical solution of the utility model is to rotate the motor 6 in the direction adjustment component to drive the height adjustment component, the spray head connection component and the spray head 18 arranged on the direction adjustment component to rotate, so as to adjust the angle of the spray head 18. The height of the spray head connection component of the height adjustment component is used to adjust the height of the spray head 18. By arranging a quick replacement component in the mounting shell 17 and arranging a mounting rod 19 at the bottom of the spray head 18 that can be snapped with the mounting shell 17, the spray head 18 can be quickly replaced, avoiding the dust control effect from being reduced due to the inability to quickly replace the spray head 18 when the spray head 18 is damaged or blocked.

[0062] In an optional embodiment of the present utility model, the quick-change assembly includes push rods 21 disposed on both sides of the mounting shell 17;

[0063] The push rod 21 passes through the side of the mounting shell 17 and is connected to the push plate 20 at one end and to the connecting plate 22 at the other end;

[0064] The connecting plate 22 is sleeved on the end of the slide bar 27, and one end of the slide bar 27 away from the connecting plate 22 is fixedly connected to the baffle 29, and the baffle 29 is fixedly connected to the mounting shell 17;

[0065] The slide bar 27 is sleeved with a spring 28 , and the spring 28 is located between the connecting plate 22 and the baffle 29 .

[0066] In an optional embodiment of the present utility model, the quick-change assembly further includes a connecting block 24;

[0067] The two ends of the connecting plate 22 are connected to the connecting block 24 through the rotating rod 23.

[0068] One end of the connecting block 24 is fixedly connected to the side of the clamping block 25, and the clamping block 25 is sleeved on a supporting rod 26 fixedly connected to the inner surface of the mounting shell 17;

[0069] The support rod 26 is arranged perpendicular to the push rod 21 .

[0070] In an optional embodiment of the present utility model, a through hole is opened on the rear end surface of the mounting shell 17, and the distance between the two support rods 26 connected to the same quick-change assembly is greater than the diameter of the through hole;

[0071] The diameter of the mounting rod 19 is smaller than the diameter of the through hole, and the mounting rod 19 can be engaged with the clamping block 25 .

[0072] In the above three embodiments, Figure 4 , Figure 5 and Figure 6 As shown, a set of quick-change components are arranged on both sides of the mounting shell 17, and the quick-change components are symmetrically arranged in the mounting shell 17. The push disk 20 is arranged on the outside of the mounting shell 17 and is fixedly connected to the push rod 21, which plays a role in pushing the quick-change components to move inside the mounting shell 17. The other end of the push rod 21 is fixedly connected to the side of the connecting plate 22, and one end of the side of the connecting plate 22 away from the push rod 21 is sleeved on the end of the slide rod 27, so that when the disk is pushed, the connecting plate 22 can slide along the slide rod 27, and the other end of the slide rod 27 is fixedly connected to the baffle 29 fixed inside the mounting shell 17, which plays a role in limiting the moving range of the quick-change components. A spring 28 is sleeved on the outside of the slide rod 27 to provide elastic support and reset the quick-change components when the disk is not pushed.

[0073] The top and bottom of the connecting plate 22 are both hinged to one end of the rotating rod 23, and the other end of the rotating rod 23 is hinged to the connecting block 24. Since the connecting block 24 is fixedly connected to the clamping block 25 and the clamping block 25 is sleeved on the supporting rod 26, and the supporting rod 26 is vertically arranged with the pushing rod 21, when the pushing plate 20 is pushed, the connecting plate 22 moves along the sliding rod 27 toward the inside of the mounting shell 17, and at the same time, the connecting block 24 and the clamping block 25 move along the connecting rod 7 toward the edge of the mounting shell 17.

[0074] The through hole is located on the rear end surface of the mounting shell 17, and the center of the through hole is located between the two support rods 26 connected to the same quick-change assembly. When in use, after pushing the push plate 20, the clamping block 25 moves along the direction of the support rod 26 toward the edge of the mounting shell 17, and at this time, the mounting rod 19 can be inserted into the through hole, and the old sprinkler head 18 can be taken out, and the mounting rod 19 at the bottom of the new sprinkler head 18 can be placed into the through hole. After stopping pushing the push plate 20, under the action of the elastic force of the spring 28, the quick-change assembly is reset, and the clamping block 25 moves along the support rod 26, and finally clamps into the clamping groove 30 on the mounting rod 19, so as to fix the sprinkler head 18.

[0075] In an optional embodiment of the present utility model, the height adjustment assembly includes a box 9;

[0076] A threaded rod 13 is disposed in the box body 9, one end of the threaded rod 13 is fixedly connected to the bottom of the lifting rod 14, and the other end is rotatably connected to the center of the worm gear 12;

[0077] The worm wheel 12 is meshedly connected with the worm 11, and a rotating disk 10 is provided on the side of the worm 11;

[0078] The top of the lifting rod 14 is fixedly connected to the bottom of the mounting shell 17 .

[0079] In the above embodiment, if Figure 3 As shown, a worm wheel 12 is disposed in the housing 9, the worm wheel 12 is disposed on the side of the worm 11 and meshed with the worm 11, one end of the worm 11 is located outside the housing 9 and fixedly connected to the turntable 10. The middle portion of the worm wheel 12 is threadedly connected to the outer surface of the threaded rod 13, and one end of the threaded rod 13 is fixedly connected to the bottom of the lifting rod 14.

[0080] When in use, the worm wheel 12 is driven to rotate by rotating the turntable 10, thereby moving the threaded rod 13 and the lifting rod 14 up and down. Since one end of the lifting rod 14 is fixedly connected to the bottom surface of the mounting shell 17, the height of the spray head connection assembly and the spray head 18 can be adjusted.

[0081] In an optional embodiment of the present utility model, a limit block 15 is provided on the side of the lifting rod 14, and the limit block 15 is located inside the box body 9;

[0082] A limiting plate 16 is disposed on the top of the box body 9 . The limiting plate 16 and the limiting block 15 are located on the same straight line, and the limiting block 15 slides in the limiting plate 16 .

[0083] In the above embodiment, if Figure 2 and Figure 3 As shown, two limit plates 16 are arranged on the top of the box body 9, and the limit plates 16 are arranged vertically with the top of the box body 9 and are in the same straight line as the limit blocks 15. The limit plates 16 are groove-shaped structures, and the bottom of the limit plates 16 is an open end and communicates with the inside of the box body 9. Since the limit plates 16 are slidably connected with the limit blocks 15 arranged on the side of the lifting rod 14, when the lifting rod 14 moves up and down, the limit blocks 15 move in the limit plates 16. Furthermore, the top of the limit plates 16 is a closed end, which plays a role in limiting the height of the lifting rod 14.

[0084] In an optional embodiment of the present invention, a scale plate 31 is provided on the side of the box body 9 .

[0085] In the above embodiment, if Figure 3 As shown, the box body 9 is preferably a transparent box body, and the scale plate 31 serves to observe the lifting height of the lifting rod 14.

[0086] In an optional embodiment of the utility model, the direction adjustment assembly includes a connection disk 8, and the box body 9 is arranged on the connection disk 8;

[0087] The bottom of the connecting plate 8 is fixedly connected to one end of the connecting rod 7 , and the other end of the connecting rod 7 passes through the box body 9 and the connecting plate 8 to be connected to the motor 6 .

[0088] In the above embodiment, if Figure 2 As shown, the transmission shaft of the motor 6 is fixedly connected to the bottom of the connection plate 8 through the connecting rod 7, and the box 9 is placed on the connection plate 8. When the motor 6 rotates, the connection plate 8 and the height adjustment assembly, the sprinkler head connector and the sprinkler head 18 on the connection plate 8 are driven to rotate, thereby adjusting the direction of the sprinkler head 18.

[0089] In an optional embodiment of the utility model, a groove is formed on the bottom plate 1;

[0090] The connecting plate 8 and the motor 6 are both arranged in the groove.

[0091] In the above embodiment, the bottom of the motor 6 is fixed in the groove. The shape of the cross section of the groove is the same as that of the connecting plate 8, and the depth of the groove is the same as the height of the direction adjustment component.

[0092] In an optional embodiment of the present invention, a locking device is provided on the universal wheel 2 .

[0093] The working principle and use of the dust control equipment described in the utility model are as follows:

[0094] The appropriate sprinkler head 18 is selected according to the size of the dust range. By pressing the push plates 20 on both sides, the two push rods 21 control the two connecting plates 22 to move toward each other along the two sliding rods 27 respectively. In the process of the two connecting plates 22 moving toward each other, the connecting plates 22 squeeze the springs 28, and the two sets of rotating rods 23 rotate in the opposite direction. In the process of the two sets of rotating rods 23 rotating in the opposite direction, the connecting blocks 24 connected to the rotating rods 23 respectively control the card blocks 25 to move along the support rods 26. Then, the two mounting rods 19 at the bottom of the sprinkler head 18 are inserted into the interior of the mounting shell 17 to connect the water pipe 5 to the bottom of the sprinkler head 18. Then, the two push plates 20 can be loosened. The spring 28 loses the squeezing of the connecting plate 22 and generates a reset movement to push the connecting plate 22 to move. When the two connecting plates 22 are pushed by the two springs 28 and move away from each other, the two rotating rods 23 will rotate relatively, and then the two card blocks 25 will be stuck in the card slots 30 on the mounting rods 19, thereby forming a limit for the mounting rods 19, and completing the rapid installation of the sprinkler head 18.

[0095] During the dust reduction process, when it is necessary to adjust the angle of the sprinkler head 18, start the motor 6 to control the connecting rod 7 to rotate, and the connecting plate 8 drives the box body 9 to rotate through the connecting rod 7. The mounting shell 17 is driven to rotate through the lifting rod 14 connected to the box body 9, so that the spraying direction of the sprinkler head 18 connected to the mounting shell 17 can be adjusted.

[0096] When the height needs to be adjusted, it is only necessary to rotate the turntable 10 to rotate the worm 11 and the worm wheel 12, and the threaded rod 13 is controlled to rotate by the worm wheel 12. During the rotation of the threaded rod 13, the lifting rod 14 will move along the threaded rod 13. When the lifting rod 14 moves, the positions of the mounting shell 17 and the sprinkler head 18 will also change, thereby achieving the height position adjustment of the sprinkler head 18.

[0097] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A dust control device, characterized in that: include: Bottom plate (1); A universal wheel (2) located below the base plate (1), and a handle (3) located above the base plate (1); A spray device connected to the upper surface of the base plate (1); The spraying equipment comprises a height adjustment component, a direction adjustment component, a spray head connection component, a water tank (4) and a spray head (18); The shower head connection assembly comprises a mounting shell (17), the bottom of the mounting shell (17) being connected to the height adjustment assembly; Quick-change components are arranged on both sides of the installation shell (17); The bottom surface of the mounting shell (17) is fixedly connected to the height adjustment assembly, and the rear end surface of the mounting shell (17) is connected to the water tank (4) via a water pipe (5); A mounting rod (19) is provided at the bottom of the spray head (18); The mounting rod (19) is fixedly connected to the bottom of the shower head (18); a clamping groove (30) is provided on the mounting rod (19) and is clamped to the mounting shell (17).

2. The dust control equipment according to claim 1 is characterized in that: The quick-change assembly comprises push rods (21) arranged on both sides of the mounting shell (17); The push rod (21) passes through the side of the mounting shell (17) and is connected to the push plate (20) at one end and to the connecting plate (22) at the other end; The connecting plate (22) is sleeved on the end of the slide rod (27), one end of the slide rod (27) away from the connecting plate (22) is fixedly connected to the baffle (29), and the baffle (29) is fixedly connected to the mounting shell (17); The slide bar (27) is sleeved with a spring (28), and the spring (28) is located between the connecting plate (22) and the baffle (29).

3. The dust control equipment according to claim 2 is characterized in that: The quick-change assembly also includes a connecting block (24); The two ends of the connecting plate (22) are connected to the connecting block (24) via a rotating rod (23). One end of the connecting block (24) is fixedly connected to the side of a clamping block (25), and the clamping block (25) is sleeved on a supporting rod (26) fixedly connected to the inner surface of the mounting shell (17); The support rod (26) is arranged perpendicularly to the push rod (21).

4. The dust control equipment according to claim 3 is characterized in that: A through hole is formed on the rear end surface of the mounting shell (17), and the distance between the two support rods (26) connected to the same quick-change assembly is greater than the diameter of the through hole; The diameter of the mounting rod (19) is smaller than the diameter of the through hole, and the mounting rod (19) can be engaged with the clamping block (25).

5. The dust control equipment according to claim 1, characterized in that: The height adjustment assembly comprises a box (9); A threaded rod (13) is arranged in the box body (9), one end of the threaded rod (13) is fixedly connected to the bottom of the lifting rod (14), and the other end is rotatably connected to the center of the worm gear (12); The worm wheel (12) is meshingly connected with the worm (11), and a rotating disk (10) is arranged on the side of the worm (11); The top of the lifting rod (14) is fixedly connected to the bottom of the mounting shell (17).

6. The dust control equipment according to claim 5, characterized in that: A limit block (15) is provided on the side of the lifting rod (14), and the limit block (15) is located on the inner side of the box body (9); A limiting plate (16) is arranged on the top of the box body (9); the limiting plate (16) and the limiting block (15) are located on the same straight line; and the limiting block (15) slides in the limiting plate (16).

7. The dust control equipment according to claim 6, characterized in that: A scale plate (31) is provided on the side of the box body (9).

8. The dust control equipment according to claim 5, characterized in that: The direction adjustment component comprises a connection disk (8), and the box body (9) is arranged on the connection disk (8); The bottom of the connecting plate (8) is fixedly connected to one end of the connecting rod (7), and the other end of the connecting rod (7) passes through the box (9) and the connecting plate (8) to be connected to the motor (6).

9. The dust control equipment according to claim 8, characterized in that: The bottom plate (1) is provided with a groove; The connecting disk (8) and the motor (6) are both arranged in the groove.

10. The dust control equipment according to claim 1, characterized in that: The universal wheel (2) is provided with a locking device.

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