Information technology multimedia display device

Abstract

The invention discloses an information science and technology multimedia display device, and relates to the technical field of information science and technology, the information science and technology multimedia display device comprises a bottom plate, the periphery of the top of the bottom plate is fixedly provided with side plates, the two sides of the bottom plate are respectively provided with a lifting mechanism, and the lifting mechanism is characterized in that the lifting mechanism comprises a first screw rod; the first lead screws are movably installed on the two sides of the surface of the bottom plate, and the surfaces of the first lead screws are provided with two sections of threads opposite in direction. A third motor on the outer side of a bottom plate is started to drive a first lead screw to rotate, the directions of threads on the two sides of the surface of the first lead screw are opposite, and during rotation, two movable blocks in threaded connection with the surface of the first lead screw can perform reverse displacement, so that the distance between the bottoms of telescopic frames is shortened or increased, and a display screen installed on the top can be driven to move up and down under the effect of the Pythagorean theorem; when the device is used, a user can move the device to a proper position.

Description

Technical Field

[0001] The present invention relates to the technical field of information technology, and in particular to an information technology multimedia display device. Background Art

[0002] With the advent of the information age, people's life, study and work are inseparable from information technology, computers, networks, mobile communications, electronic banking, digital television... Faced with such a rapidly changing society, multimedia has been widely used in the display field. Multimedia technology refers to the technology of using computers to comprehensively process and manage various media information such as text, data, graphics, images, animation, sound, etc., so that users can interact with computers in real time through multiple senses. It is also called computer multimedia technology. Multimedia display stands are often used in some large companies, buildings, governments or administrative units.

[0003] The patent document with application number CN112066212A discloses an information technology multimedia display device, which includes: a base; at least one support frame fixedly arranged on the upper surface; a mounting frame, a guide rail support frame fixedly arranged at the corresponding position of the bottom, and the guide rail support frame and the support frame slidingly cooperate; a display screen cover plate, rotatably arranged at the end of the mounting frame, used to cover the mounting frame for protection; a telescopic driving member, installed on the base, used to drive the display screen cover plate to rotate and the mounting frame to rise and fall; wherein, a support member is slidably arranged at the bottom of the mounting frame, the top of the telescopic driving member is connected to the support member, and the support member is connected to the display screen cover plate through a pull line. The advantages of the present invention are simple structure, convenient operation, good safety, low production cost, and good synchronization.

[0004] The patent document with application number CN111594570A discloses an information technology multimedia rapid display device, including a placement box, a mounting column, a display screen, a shock absorbing mechanism, a cleaning mechanism and an adjustment mechanism, wherein the shock absorbing mechanism is located inside the placement box, and the shock absorbing mechanism is located inside the placement box, and the shock absorbing mechanism includes a stabilizing plate; the present invention effectively avoids the inability to buffer the vibration of the device when it is moved by setting a stabilizing plate, which is beneficial to improving the stability of the device and thus extending the service life of the device; the setting of a cleaning brush effectively avoids the surface of the display screen from being covered with dust after long-term use, which is inconvenient to clean, and is beneficial to maintaining the cleanliness of the surface of the display screen, thereby facilitating people to view the displayed information and facilitating better use of the device; the setting of a card block effectively avoids the inability to adjust the armrests on the device or the use of bolts to adjust, which is time-consuming and labor-intensive; the present invention is convenient for people of different heights to use, is easy to operate, and is highly practical.

[0005] However, the above device has the following two disadvantages in actual use:

[0006] First, although the above device can properly clean and remove dust from the display screen to a certain extent, in actual use, the above device lacks the ability to be stored. When the device is not in use, the device cannot be well stored, which can easily affect the service life of the device over time.

[0007] Second, it is difficult to adjust the installation position of the above device at will after it is installed in one place, and it cannot be well applied to different places. Each installation and disassembly will waste a lot of time, which seriously affects the efficiency of use. Summary of the invention

[0008] The purpose of the present invention is to provide an information technology multimedia display device, which has the advantages of being able to accommodate a display screen and being convenient to move, thereby solving the common problem of being inconvenient to move.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an information technology multimedia display device, comprising a base plate, side plates are fixedly installed around the top of the base plate, lifting mechanisms are arranged on both sides of the base plate, and two groups of lifting mechanisms are arranged, characterized in that: the lifting mechanism comprises a first screw rod, the first screw rod is movably installed on both sides of the surface of the base plate, the surface of the first screw rod is provided with two sections of threads in opposite directions, the surfaces of the two sections of screws are threadedly installed with movable blocks, the top of the movable block is movably installed with a telescopic frame, and the top of the lifting mechanism is provided with an adjustment mechanism; the adjustment mechanism comprises a mounting block, a first motor is fixedly installed on the inner side of the mounting block, a driving wheel is fixedly installed on the top of the first motor, one side of the driving wheel is meshedly connected with a driven tooth, the inner side of the driven tooth is fixedly connected with a mounting rotating rod, and a bearing is arranged between the mounting rotating rod and the mounting block.

[0010] Preferably, a fixing frame is fixedly mounted on the inner side of the mounting rotating rod, a display screen is fixedly mounted on the surface of the fixing frame, and dust removal mechanisms are arranged on both sides of the fixing frame.

[0011] Preferably, the dust removal mechanism includes a second screw rod, the surface of the second screw rod is threadedly installed on a threaded block, a dust removal rod is fixedly installed on the inner side of the threaded block, the dust removal rod is made of soft material, the dust removal rod is in contact with the surface of the display screen, and the top of the second screw rod is fixedly connected to a second motor.

[0012] Preferably, a heat sink is installed on the back of the fixing frame through small screws, heat dissipation holes are arranged on the surface of the heat sink, a plurality of connection holes are arranged on the bottom of the fixing frame, and a plurality of switch buttons are arranged on both sides of the fixing frame.

[0013] Preferably, a third motor is fixedly connected to the top of the first screw rod and located on the outer side of the bottom plate, and a reinforcement block is fixedly installed on the bottom of the third motor.

[0014] Preferably, a position sensor is provided on the inner side of the fixing frame, and a buffer mechanism is provided on the middle part of the bottom plate surface.

[0015] Preferably, the buffer mechanism comprises a shock-absorbing spring, a buffer plate is fixedly connected to the top of the shock-absorbing spring, a surface of the buffer plate is made of a rubber cushion material, and a contact sensor is arranged on the surface of the buffer plate.

[0016] Preferably, first glass windows are provided on both the front and rear sides of the side panel, and reinforcement plates are fixedly installed on both the left and right sides of the side panel.

[0017] Preferably, a support rod is fixedly installed on the back side of the side panel, a push rod is fixedly installed on the top of the support rod, a non-slip soft film is provided on the surface of the push rod, and protective cover plates are movably installed on both the left and right sides of the top of the side panel.

[0018] Preferably, a second glass window is provided on the surface of the protective cover plate, a pull ring is also fixedly installed on the surface of the protective cover plate, and a self-locking universal wheel is fixedly installed on the bottom of the base plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention drives the first screw rod to rotate by starting the third motor on the outer side of the bottom plate. The threads on both sides of the surface of the first screw rod are in opposite directions. When rotating, the two movable blocks connected by threads on the surface can make reverse displacements, thereby shortening or increasing the spacing at the bottom of the telescopic frame. Under the action of the Pythagorean theorem, the display screen installed on the top can be driven up and down. When in use, the user can move the device to a suitable position and raise the display screen to a suitable height through the lifting mechanism. The display screen can be connected to the multimedia controller to play and display various contents. The adjustment mechanism can adjust the angle of the display screen. When the display screen needs to be displayed, lifting the display screen to a certain height will trigger the position sensor installed inside the fixed frame, automatically driving the first motor to operate, thereby erecting the display screen. Similarly, when the display screen needs to be folded, the lifting mechanism lowers it to a certain height, triggering the sensor, thereby controlling the first motor to drive the display screen to be flat, so as to facilitate the storage of the display screen and form a good protection for it.

[0021] 2. The present invention can well fix the display screen by setting a fixed frame. The fixed frame has a certain space inside, which is also convenient for subsequent wiring operations. The dust removal mechanism can be set to clean the floating dust on the surface of the display screen. When the display screen is no longer in use, there may be a certain amount of floating dust on the surface. At this time, the dust removal rod can be driven up and down by controlling the second motor. The dust removal rod contacts the surface of the display screen and can well brush off the floating dust on the surface. The material on the surface of the dust removal rod is very soft and will not cause damage to the display screen. The heat dissipation plate can be set to keep the air inside the fixed frame circulating to prevent the display screen from overheating due to use and affecting its service life. The reinforcement block can be set to well enhance the stability of the installation of the third motor. The buffer mechanism can be set to prevent the display screen from being damaged when it falls when the display screen is laid flat and stored in the box. The impact mechanism can buffer it well, the material on the surface of the buffer plate is soft, which can prevent the display screen from being damaged when it hits the buffer plate, and the shock-absorbing spring at the bottom of the buffer plate can also dilute the impact of the fall well. When the display screen falls and touches the contact sensor on the surface of the buffer plate, the third motor driving the lifting mechanism can be automatically controlled to stop running to prevent it from continuing to fall. Through the setting of the first glass window, the user can observe the inside of the box from the outside. Through the setting of the push rod and the self-locking universal wheel, the device can be mobile, which is convenient for users to display multimedia in multiple venues without being restricted by space. The anti-slip soft film on the surface of the push rod can enhance the user's experience when pushing. Through the setting of the protective cover, the display screen can be properly protected after being stored. Through the setting of the pull ring, the user can open the protective cover conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front perspective view of the structure of the present invention;

[0023] Figure 2 It is a rear perspective view of the structure of the present invention;

[0024] Figure 3 It is a bottom-up stereogram of the structure of the present invention;

[0025] Figure 4 It is a sectional stereoscopic view of the interior of the structure of the present invention;

[0026] Figure 5 It is a three-dimensional enlarged view of the local structure of the present invention;

[0027] Figure 6 It is an enlarged stereoscopic view of the buffer mechanism structure of the present invention;

[0028] Figure 7 It is an enlarged stereoscopic view of the adjustment mechanism structure of the present invention;

[0029] Figure 8It is an enlarged stereoscopic view of the lifting mechanism structure of the present invention.

[0030] In the figure: 1. bottom plate; 2. side plate; 3. lifting mechanism; 301. first screw rod; 302. movable block; 303. telescopic frame; 4. adjusting mechanism; 401. mounting block; 402. first motor; 403. driving wheel; 404. driven gear; 405. mounting rotating rod; 406. bearing; 5. fixing frame; 6. display screen; 7. dust removal mechanism; 701. second screw rod; 702. threaded block; 703. dust removal rod; 704. second motor; 8. small screw; 9. heat sink; 10. third motor; 11. reinforcement block; 12. buffer mechanism; 1201. shock absorbing spring; 1202. buffer plate; 1203. contact sensor; 13. first glass window; 14. reinforcement plate; 15. support rod; 16. push rod; 17. protective cover; 18. second glass window; 19. pull ring; 20. self-locking universal wheel. DETAILED DESCRIPTION

[0031] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-5 The present invention provides a technical solution: an information technology multimedia display device, comprising a bottom plate 1, side plates 2 are fixedly installed around the top of the bottom plate 1, lifting mechanisms 3 are arranged on both sides of the bottom plate 1, and the lifting mechanisms 3 are arranged in two groups, characterized in that: the lifting mechanism 3 comprises a first screw rod 301, the first screw rod 301 is movably installed on both sides of the surface of the bottom plate 1, the surface of the first screw rod 301 is provided with two sections of threads in opposite directions, the surfaces of the two sections of screws are threadedly installed with movable blocks 302, the top of the movable block 302 is movably installed with a telescopic frame 303, and the top of the lifting mechanism 3 is provided with an adjustment mechanism 4; the adjustment mechanism 4 comprises a mounting block 401, a first motor 402 is fixedly installed on the inner side of the mounting block 401, a driving wheel 403 is fixedly installed on the top of the first motor 402, one side of the driving wheel 403 is meshedly connected with a driven tooth 404, the inner side of the driven tooth 404 is fixedly connected with a mounting rotating rod 405, and a bearing 406 is arranged between the mounting rotating rod 405 and the mounting block 401.

[0033] Specifically, the third motor 10 on the outside of the bottom plate 1 is started to drive the first screw rod 301 to rotate. The thread directions on both sides of the surface of the first screw rod 301 are opposite. When rotating, the two movable blocks 302 connected by the thread on its surface can be displaced in the opposite direction, thereby shortening or increasing the spacing at the bottom of the telescopic frame 303. Under the action of the Pythagorean theorem, the display screen 6 installed on the top can be driven up and down. When in use, the user can move the device to a suitable position, and raise the display screen 6 to a suitable height through the lifting mechanism 3. The display screen 6 can be connected to a multimedia controller to play and display various contents. The adjustment mechanism 4 can adjust the angle of the display screen 6. When the display screen 6 needs to be displayed, lifting the display screen 6 to a certain height will trigger the position sensor installed inside the fixed frame 5, automatically driving the first motor 402 to operate, thereby erecting the display screen 6. Similarly, when the display screen 6 needs to be folded, the lifting mechanism 3 lowers it to a certain height, triggering the sensor, thereby controlling the first motor 402 to drive the display screen 6 to be flat, so as to facilitate the storage of the display screen 6 and form a good protection for it.

[0034] A fixing frame 5 is fixedly mounted on the inner side of the mounting rotating rod 405 , a display screen 6 is fixedly mounted on the surface of the fixing frame 5 , and dust removal mechanisms 7 are arranged on both sides of the fixing frame 5 .

[0035] Specifically, by setting the fixed frame 5, the display screen 6 can be well fixed. The fixed frame 5 has a certain space inside, which is also convenient for subsequent wiring operations. By setting the dust removal mechanism 7, the floating dust on the surface of the display screen 6 can be cleaned. When the display screen 6 is no longer in use, there may be a certain amount of floating dust on the surface. At this time, the dust removal rod 703 can be driven up and down by controlling the second motor 704. The dust removal rod 703 contacts the surface of the display screen 6 and can well brush off the floating dust on its surface.

[0036] The dust removal mechanism 7 includes a second screw rod 701, the surface of which is threadedly installed on a threaded block 702, and a dust removal rod 703 is fixedly installed on the inner side of the threaded block 702. The dust removal rod 703 is made of soft material and is in contact with the surface of the display screen 6. The top of the second screw rod 701 is fixedly connected to a second motor 704.

[0037] Specifically, the material on the surface of the dust removal rod 703 is very soft and will not cause damage to the display screen 6 .

[0038] A heat sink 9 is installed on the back of the fixing frame 5 through a small screw 8. The surface of the heat sink 9 is provided with heat dissipation holes. The bottom of the fixing frame 5 is provided with a plurality of connection holes. Both sides of the fixing frame 5 are provided with a plurality of switch buttons.

[0039] Specifically, by disposing the heat sink 9, the air inside the fixing frame 5 can be kept circulating, thereby preventing the display screen 6 from being overheated during use and affecting its service life.

[0040] The third motor 10 is fixedly connected to the top of the first screw rod 301 and located on the outer side of the bottom plate 1 , and a reinforcement block 11 is fixedly installed on the bottom of the third motor 10 .

[0041] Specifically, by disposing the reinforcement block 11, the installation stability of the third motor 10 can be greatly enhanced.

[0042] A position sensor is arranged inside the fixing frame 5 , and a buffer mechanism 12 is arranged at the middle portion of the surface of the bottom plate 1 .

[0043] Specifically, through the setting of the buffer mechanism 12, when the display screen 6 is laid flat and stored in the box, in order to prevent the display screen 6 from being damaged when falling, the buffer mechanism 12 can buffer it well. The material on the surface of the buffer plate 1202 is soft, which can prevent the display screen 6 from being damaged when it hits the buffer plate 1202, and the shock-absorbing spring 1201 at the bottom of the buffer plate 1202 can also effectively dilute the impact of falling.

[0044] The buffer mechanism 12 includes a shock absorbing spring 1201 , the top of which is fixedly connected with a buffer plate 1202 , the surface of the buffer plate 1202 is made of a rubber cushion material, and a contact sensor 1203 is arranged on the surface of the buffer plate 1202 .

[0045] Specifically, when the display screen 6 falls and touches the contact sensor 1203 on the surface of the buffer plate 1202, the third motor 10 driving the lifting mechanism 3 can be automatically controlled to stop running to prevent it from continuing to fall.

[0046] First glass windows 13 are provided on both the front and rear sides of the side panel 2 , and reinforcing plates 14 are fixedly installed on both the left and right sides of the side panel 2 .

[0047] Specifically, the first glass window 13 is provided so that the user can observe the interior of the box from the outside.

[0048] A support rod 15 is fixedly installed on the back of the side panel 2, a push rod 16 is fixedly installed on the top of the support rod 15, a non-slip soft film is provided on the surface of the push rod 16, and protective cover plates 17 are movably installed on both sides of the top of the side panel 2.

[0049] Specifically, by setting the push rod 16 and the self-locking universal wheel 20, the device can be made mobile, which is convenient for users to display multimedia in multiple venues without being restricted by space, and the anti-slip film on the surface of the push rod 16 can enhance the user's experience when pushing.

[0050] A second glass window 18 is disposed on the surface of the protective cover plate 17 , a pull ring 19 is also fixedly mounted on the surface of the protective cover plate 17 , and a self-locking universal wheel 20 is fixedly mounted on the bottom of the base plate 1 .

[0051] Specifically, by providing the protective cover 17 , the display screen 6 can be properly protected after being stored, and by providing the pull ring 19 , it is convenient for the user to open the protective cover 17 .

[0052] Working principle: When the device is used, the third motor 10 on the outer side of the bottom plate 1 is started to drive the first screw rod 301 to rotate. The thread directions on both sides of the surface of the first screw rod 301 are opposite. When rotating, the two movable blocks 302 connected by the thread on its surface can make reverse displacements, thereby shortening or increasing the spacing at the bottom of the telescopic frame 303. Under the action of the Pythagorean theorem, the display screen 6 installed on the top can be driven up and down. When in use, the user can move the device to a suitable position and raise the display screen 6 to a suitable height through the lifting mechanism 3. The display screen 6 can be connected to a multimedia controller to play and display various contents. The adjustment mechanism 4 can adjust the angle of the display screen 6. When the display screen 6 needs to display When the display screen 6 is lifted to a certain height, the position sensor installed inside the fixing frame 5 will be triggered, which will automatically drive the first motor 402 to operate, thereby erecting the display screen 6. Similarly, when the display screen 6 needs to be folded up, the lifting mechanism 3 will lower it to a certain height, triggering the sensor, thereby controlling the first motor 402 to drive the display screen 6 to be laid flat, so as to facilitate the storage of the display screen 6 and form a good protection for it. The display screen 6 can be well fixed by the fixing frame 5, and there is a certain space inside the fixing frame 5, which is also convenient for subsequent wiring operations. The dust removal mechanism 7 can clean the dust on the surface of the display screen 6. When the display screen 6 is no longer in use, there may be a certain amount of dust on the surface. The dust removal rod 703 can be driven up and down by controlling the second motor 704. The dust removal rod 703 contacts the surface of the display screen 6, which can effectively wipe off the floating dust on its surface. The material on the surface of the dust removal rod 703 is very soft and will not cause damage to the display screen 6. The stability of the installation of the third motor 10 can be well enhanced by the reinforcement block 11. When the display screen 6 is laid flat and stored in the box, the buffer mechanism 12 can effectively buffer the display screen 6 to prevent it from being damaged when it falls. The material on the surface of the buffer plate 1202 is soft, which can prevent the display screen 6 from being damaged when it hits the buffer plate 1202. The shock-absorbing spring 1201 at the bottom of the buffer plate 1202 can also effectively dilute the When the display screen 6 falls and touches the contact sensor 1203 on the surface of the buffer plate 1202 due to the impact of falling, the third motor 10 driving the lifting mechanism 3 can be automatically controlled to stop running to prevent it from continuing to fall. The first glass window 13 can allow the user to observe the interior of the box from the outside. The push rod 16 and the self-locking universal wheel 20 can make the device movable, which is convenient for users to display multimedia in multiple venues without being restricted by space. The anti-slip film on the surface of the push rod 16 can enhance the user's experience when pushing. The protective cover 17 can be used to properly protect the display screen 6 after it is stored, and the pull ring 19 can facilitate the user to open the protective cover 17.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An information technology multimedia display device, comprising a bottom plate (1), side plates (2) are fixedly mounted around the top of the bottom plate (1), lifting mechanisms (3) are arranged on both sides of the bottom plate (1), and the lifting mechanisms (3) are arranged in two groups, characterized in that: The lifting mechanism (3) comprises a first screw rod (301), the first screw rod (301) is movably mounted on both sides of the surface of the bottom plate (1), the surface of the first screw rod (301) is provided with two sections of threads in opposite directions, the surfaces of the two sections of the screw are both threadedly mounted with movable blocks (302), the top of the movable block (302) is movably mounted with a telescopic frame (303), and the top of the lifting mechanism (3) is provided with an adjustment mechanism (4); The adjustment mechanism (4) comprises a mounting block (401), a first motor (402) being fixedly mounted on the inner side of the mounting block (401), a driving wheel (403) being fixedly mounted on the top of the first motor (402), a driven tooth (404) being meshingly connected to one side of the driving wheel (403), a mounting rotating rod (405) being fixedly connected to the inner side of the driven tooth (404), and a bearing (406) being arranged between the mounting rotating rod (405) and the mounting block (401).

2. An information technology multimedia display device according to claim 1, characterized in that: A fixing frame (5) is fixedly mounted on the inner side of the mounting rotating rod (405), a display screen (6) is fixedly mounted on the surface of the fixing frame (5), and dust removal mechanisms (7) are arranged on both sides of the fixing frame (5).

3. An information technology multimedia display device according to claim 2, characterized in that: The dust removal mechanism (7) comprises a second screw rod (701), the surface of the second screw rod (701) is threadedly mounted on a threaded block (702), a dust removal rod (703) is fixedly mounted on the inner side of the threaded block (702), the dust removal rod (703) is made of a soft material, the dust removal rod (703) is in contact with the surface of the display screen (6), and a second motor (704) is fixedly connected to the top of the second screw rod (701).

4. The information technology multimedia display device according to claim 2, characterized in that: A heat sink (9) is mounted on the back of the fixing frame (5) via a small screw (8), and heat sink holes are arranged on the surface of the heat sink (9). A plurality of connection holes are arranged at the bottom of the fixing frame (5), and a plurality of switch buttons are arranged on both sides of the fixing frame (5).

5. The information technology multimedia display device according to claim 1, characterized in that: A third motor (10) is fixedly connected to the top of the first screw rod (301) and located on the outside of the bottom plate (1), and a reinforcing block (11) is fixedly installed on the bottom of the third motor (10).

6. The information technology multimedia display device according to claim 2, characterized in that: A position sensor is arranged on the inner side of the fixing frame (5), and a buffer mechanism (12) is arranged in the middle of the surface of the bottom plate (1).

7. An information technology multimedia display device according to claim 6, characterized in that: The buffer mechanism (12) comprises a shock absorbing spring (1201), the top of the shock absorbing spring (1201) is fixedly connected to a buffer plate (1202), the surface of the buffer plate (1202) is made of a rubber cushion material, and a contact sensor (1203) is arranged on the surface of the buffer plate (1202).

8. The information technology multimedia display device according to claim 1, characterized in that: The front and rear sides of the side panel (2) are both provided with first glass windows (13), and the left and right sides of the side panel (2) are both fixedly mounted with reinforcement plates (14).

9. The information technology multimedia display device according to claim 1, characterized in that: A support rod (15) is fixedly mounted on the back of the side panel (2), a push rod (16) is fixedly mounted on the top of the support rod (15), a non-slip soft film is provided on the surface of the push rod (16), and protective cover plates (17) are movably mounted on both left and right sides of the top of the side panel (2).

10. An information technology multimedia display device according to claim 9, characterized in that: A second glass window (18) is arranged on the surface of the protective cover plate (17), a pull ring (19) is also fixedly mounted on the surface of the protective cover plate (17), and a self-locking universal wheel (20) is fixedly mounted on the bottom of the base plate (1).

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