Mobile multimedia playing device

Abstract

The invention discloses a mobile multimedia playing device, which relates to the technical field of playing devices and comprises a player and a moving seat, and the player is mounted at the top end of the moving seat. According to the cleaning mechanism, starting and stopping of rotation of a cleaning roller are cooperatively controlled through lifting of a protection plate and transmission of a bevel gear, a brush plate, a scraping piece and a micro fan are matched for filtering, screen cleaning and impurity recycling are automatically completed when the protection plate shields, and secondary pollution is avoided; the supporting mechanism realizes that the protection plate moves downwards to synchronously drive the placement table to be horizontally placed through the track design of a guide groove, and is automatically stored during gravity resetting, so that the space is saved, and extra energy consumption is avoided; the protection mechanism accurately controls a protection plate to ascend and descend through a multi-stage electric push rod so as to isolate dust and impact, an'opening and closing-cleaning-storage 'integrated closed loop is formed, driving is conducted only through the multi-stage electric push rod, the transmission complexity is reduced, comprehensive energy consumption is reduced, and meanwhile protection reliability is improved and operation and maintenance cost is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of playback devices, and in particular to a mobile multimedia playback device. Background Art

[0002] Multimedia refers to the technology that can simultaneously acquire, process, edit, store and display two or more different types of information media, also known as multimedia technology. Nowadays, multimedia technology is often associated with computers. This is because the digitalization and interactive processing capabilities of computers have greatly promoted the development of multimedia technology. At present, multimedia advertising playback is widely used in conference halls, exhibition halls, hotels, shopping malls and other places.

[0003] According to a convenient multimedia playback device with the announcement number CN215495956U, it includes a support plate, an open box is fixedly installed on the top of the support plate, and the open box forms an opening upward; a multimedia touch all-in-one machine is placed inside the open box, the interior of the open box is slidably connected to a limit block, a positioning piece is provided on the open box, and the positioning piece is blocked by the limit block; a cleaning piece is provided on the open box, and the cleaning surface of the cleaning piece presses the display surface of the multimedia touch all-in-one machine. By placing the multimedia touch all-in-one machine inside the open box, it plays a role of storage, which is convenient for storage and transportation; by providing a cleaning piece, the display surface of the multimedia touch all-in-one machine can be stored and wiped clean when it is moved out.

[0004] Regarding the above-mentioned related schemes, the multimedia touch all-in-one machine that is moved in is stored and protected by an open box, and the multimedia touch all-in-one machine is wiped and cleaned by wiping cotton when it is stored and moved out. Although this method can achieve certain protection and cleaning effects, it requires manual pushing and pulling of the multimedia touch all-in-one machine to trigger the wiping cotton to wipe the screen. The operation is relatively laborious and cumbersome, and the wiping cotton is prone to form a source of pollution after absorbing impurities many times. When used repeatedly, it is easy to rebound particles to the surface of the screen. Therefore, it is necessary to frequently manually disassemble and replace the cleaning wiping cotton, resulting in a short maintenance cycle and easy damage to the cotton fiber structure. In addition, keyboards, remote controls and other devices are generally placed directly on the mobile rack, which makes it easy for dust to accumulate on the surface of keyboards, remote controls and other devices and easy to be accidentally touched and fall, causing damage. Summary of the Invention

[0005] The object of the present invention is to provide a mobile multimedia player to solve the technical problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a mobile multimedia playback device, comprising a player and a mobile base, wherein the player is mounted on the top of the mobile base, the player comprising a housing, a screen mounted in the middle of the front end of the housing, and a back cover mounted to the rear end of the housing with screws;

[0007] The front end of the player is provided with a protection mechanism connected to the movable seat, and the protection mechanism includes a protection plate movably connected to the front end of the player and side frames symmetrically arranged on both sides of the protection plate;

[0008] A cleaning mechanism connected to the player is provided at the top end of the inner side of the protective plate, the cleaning mechanism comprising a cleaning roller passing through the protective plate and a support frame detachably connected to the protective plate, and both sides of the cleaning roller are connected to the side frames via bearings, an end of the side frame away from the cleaning roller is connected to a rotating shaft via a bearing, a gear set is sleeved on the surface of the side frame and the rotating shaft, and a helical gear is sleeved on the side of the rotating shaft away from the gear set, and a brush plate and a scraper are sequentially provided on the inner side of the protective plate at the front end of the cleaning roller from top to bottom;

[0009] A supporting mechanism is provided at the front end of the protective plate, which includes a top frame welded to the movable seat, a vertical plate UV-cured and bonded to the protective plate, and a bottom frame movably connected to the protective plate, and a placement frame is movably connected between the vertical plate and the bottom frame.

[0010] Preferably, a multi-stage electric push rod is installed between the side frame and the movable seat, and the multi-stage electric push rod is symmetrically arranged about the central axis of the protective plate.

[0011] Preferably, a T-shaped plate is symmetrically provided at the rear end of the protective plate, and a T-shaped groove forming a sliding structure with the T-shaped plate is symmetrically opened at one end of the player close to the protective plate.

[0012] Preferably, the cleaning roller uses high-hardness ABS plastic as the supporting frame, and the outer layer of the supporting frame is wrapped with a high-elasticity silicone layer, and the silicone layer adopts a micron-level honeycomb pit design to increase the dust adsorption area while reducing the contact friction coefficient.

[0013] Preferably, both sides of the player are provided with an outer frame, the inner side of the outer frame is provided with a beveled tooth plate meshing with the bevel gear, the end of the beveled tooth plate away from the bevel gear is provided with a support rod forming a sliding structure with the outer frame, and a spring is connected between the support rod and the outer frame.

[0014] Preferably, the contact angle between the scraper and the cleaning roller is set to 30°-45°, and the scraper is made of silicone material, and the brush plate is made of nylon bristles.

[0015] Preferably, micro fans are equidistantly installed on the bottom end of the inner side of the support frame, and a filter frame is provided on the inner side of the support frame above the micro fans, and the filter frame and the support frame are connected by magnetism.

[0016] Preferably, guide rods are symmetrically arranged at one end of the placement frame, and guide grooves which form a sliding structure with the guide rods are formed on the sides of the two vertical plates close to each other. The guide grooves include inclined grooves and straight grooves located at both ends of the inclined grooves.

[0017] Preferably, pin shafts which form a rotating structure with the bottom frame are symmetrically arranged at the other end of the placement frame.

[0018] Preferably, movable grooves are symmetrically formed at the front end of the protection plate, and limiting rods are arranged inside the movable grooves. Limiting sleeves symmetrically arranged at the rear end of the bottom frame are slidably connected to the surfaces of the limiting rods.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In the cleaning mechanism of the mobile multimedia playing device, during the process of the vertical upward movement of the protection plate, the player screen is cleaned by the rotation of the cleaning roller. When the cleaning roller rotates to the end far from the screen, the brush plate, the scraping blade, the micro fan and the filter box cooperate to remove and filter and collect impurities, so as to ensure the effect of cleaning the screen and prevent secondary pollution. When the protection plate moves vertically downward, the cleaning roller stops rotating, so as to prevent the end of the cleaning roller that has not removed impurities from contacting the screen, so as to ensure the cleaning effect of the screen. Moreover, the linkage start and stop of the rotation of the cleaning roller is realized through the movement of the protection plate, which can reduce the number of independent driving components, reduce the transmission complexity and energy consumption.

[0021] 2. In the support mechanism of the mobile multimedia playing device, when the protection plate moves vertically downward, the top frame pushes the bottom frame to move vertically upward, and the placement frame is in a horizontal state through the cooperation of the guide rod and the guide groove, so as to expose and horizontally place devices such as keyboards and remote controls, which is convenient for subsequent operation and use. When the protection plate moves vertically upward, the placement frame gradually resets under the action of its own gravity, so as to realize the automatic storage protection and dust prevention of devices such as keyboards and remote controls, and at the same time reduce the space occupation, and no additional power source is required for driving, reducing the use energy consumption.

[0022] 3. In the protection mechanism of the mobile multimedia playing device, during the process of the multi-stage electric push rod working and telescoping, it can drive the protection plate to move vertically. When the protection plate moves vertically upward, the player screen can be blocked through the protection plate, so as to realize protection and dust prevention, and thus prevent being damaged by collision and affected by dust adhesion, and when the protection plate moves vertically downward, it is convenient to expose the screen of the player for normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present invention in a use state;

[0024] Figure 2Schematic three-dimensional structure diagram of the present invention in the unused state;

[0025] Figure 3 Schematic side-sectional structure diagram of the present invention;

[0026] Figure 4 This is the present invention Figure 3 Enlarged structure diagram at position A in the present invention;

[0027] Figure 5 Schematic three-dimensional structure diagram of the cleaning roller of the present invention;

[0028] Figure 6 Schematic three-dimensional structure diagram of the gear disc group and the helical tooth plate of the present invention;

[0029] Figure 7 Stereo exploded view of the filter frame and the support frame of the present invention;

[0030] Figure 8 Schematic three-dimensional structure diagram of the support mechanism of the present invention in the unfolded state;

[0031] Figure 9 Schematic three-dimensional structure diagram of the protection mechanism of the present invention.

[0032] In the figure: 1, player; 2, cleaning mechanism; 201, cleaning roller; 202, gear disc group; 203, rotating shaft; 204, support frame; 205, helical gear; 206, helical tooth plate; 207, support rod; 208, spring; 209, outer frame; 210, brush plate; 211, scraping blade; 212, filter frame; 213, micro fan; 3, support mechanism; 301, top frame; 302, vertical plate; 303, guide groove; 304, guide rod; 305, placement frame; 306, pin shaft; 307, bottom frame; 308, limit sleeve; 309, limit rod; 4, protection mechanism; 401, protection plate; 402, side frame; 403, multi-stage electric push rod; 404, T-shaped plate; 405, T-shaped groove; 5, moving seat. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1 - 4, the present invention provides a technical solution: a mobile multimedia playback device, which includes a player 1 and a mobile base 5, and the player 1 is installed at the top of the mobile base 5. The mobile base 5 includes a bottom plate, support legs symmetrically arranged at the top of the bottom plate, and universal wheels symmetrically arranged at the bottom of the bottom plate. The player 1 includes a housing, a screen installed in the middle of the front end of the housing, and a rear cover installed on the rear end of the housing with screws.

[0035] For this mobile multimedia playback device, after the rear cover is opened, it is convenient to maintain and repair the internal components of the player 1.

[0036] In Figures 1 - 4 and Figure 9 : A protection mechanism 4 is arranged at the front end of the player 1 and is connected to the mobile base 5. The protection mechanism 4 includes a protection plate 401 movably connected to the front end of the player 1 and side frames 402 symmetrically arranged on both sides of the protection plate 401. A multi-stage electric push rod 403 is installed between the side frame 402 and the mobile base 5, and the multi-stage electric push rod 403 is symmetrically arranged about the central axis of the protection plate 401.

[0037] For this mobile multimedia playback device, since the protection plate 401 and the player 1 are slidably connected through a T-shaped plate 404 and a T-shaped groove 405, during the operation and expansion / contraction of the multi-stage electric push rod 403, the side frame 402 at the top of the multi-stage electric push rod 403 can drive the protection plate 401 to move in the vertical direction. When the protection plate 401 moves vertically upward, the screen of the player 1 can be blocked by the protection plate 401 to achieve protection and dust prevention, thereby preventing damage caused by bumps and dust adhesion from affecting the use effect. When the protection plate 401 moves vertically downward, it is convenient to expose the screen of the player 1 for normal use.

[0038] In Figure 1 , Figure 2 and Figure 9 : T-shaped plates 404 are symmetrically arranged at the rear end of the protection plate 401, and T-shaped grooves 405 that form a sliding structure with the T-shaped plates 404 are symmetrically opened at one end of the player 1 close to the protection plate 401.

[0039] For this mobile multimedia playback device, it can play a role in supporting and guiding the protection plate 401, enabling the protection plate 401 to only move in the vertical direction, preventing deviation and inclination, and improving stability.

[0040] In Figure 1 , Figure 2 and Figures 4 - 7In the middle: At the top end inside the protective plate 401, a cleaning mechanism 2 connected to the player 1 is penetrated. The cleaning mechanism 2 includes a cleaning roller 201 penetrating the protective plate 401 and a support frame 204 detachably connected to the protective plate 401. Both sides of the cleaning roller 201 are connected to the side frame 402 through bearings. One end of the side frame 402 away from the cleaning roller 201 is connected to a rotating shaft 203 through a bearing. A gear disk group 202 is sleeved on the surfaces of the side frame 402 and the rotating shaft 203. On the side of the rotating shaft 203 away from the gear disk group 202, a helical gear 205 is sleeved. On both sides of the player 1, outer frames 209 are provided. Inside the outer frames 209, helical tooth plates 206 meshingly connected to the helical gear 205 are provided. At one end of the helical tooth plate 206 away from the helical gear 205, a support rod 207 forming a sliding structure with the outer frame 209 is provided. A spring 208 is connected between the support rod 207 and the outer frame 209;

[0041] In the process that the protective plate 401 of this mobile multimedia playing device vertically moves upward to shield and protect the screen of the player 1, through the meshing transmission between the helical gear 205 and the helical tooth plate 206, the gear disk group 202 is driven to drive the cleaning roller 201 to rotate counterclockwise, so as to realize the cleaning of the screen of the player 1. Since the helical tooth plate 206 is elastically connected to the outer frame 209 through the spring 208, when the protective plate 401 vertically moves downward, the helical tooth plate 206 is triggered to disengage from the helical gear 205 under the action of the spring 208, so that the gear disk group 202 is in a non-rotating state and the cleaning roller 201 stops rotating, thereby preventing the end of the cleaning roller 201 that has not removed impurities from contacting the screen, so as to ensure the cleaning effect of the screen. And through the movement of the protective plate 401, the linkage start and stop of the rotation of the cleaning roller 201 can be realized, which can reduce the number of independent driving components, reduce the transmission complexity and energy consumption.

[0042] In Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 7 In the middle: Inside the protective plate 401, a brush plate 210 and a scraping blade 211 are sequentially arranged from top to bottom in front of the cleaning roller 201. At the bottom end inside the support frame 204, micro air blowers 213 are equidistantly installed. Above the micro air blowers 213 inside the support frame 204, a filter frame 212 is provided. The filter frame 212 includes side plates, a filter frame main body installed at the rear end of the side plates, and a U-shaped handle installed at the front end of the side plates.

[0043] When the cleaning roller 201 rotates away from the screen end, the brush plate 210 and the scraping blade 211 in contact with the surface of the cleaning roller 201 cooperate to remove attached impurities, and cooperate with the micro fan 213 and the detachable filter frame 212 to filter and collect impurities, so as to ensure that the contact surface is clean for the next cleaning, guarantee the effect of cleaning the screen, prevent secondary pollution, and the synchronous cleaning action of the brush plate 210 and the scraping blade 211 on the cleaning roller 201, combined with the adsorption of impurities by the micro fan 213, can greatly improve the single - time cleaning efficiency of the surface of the cleaning roller 201, while reducing the replacement frequency of the brush plate 210. In addition, the detachable filter frame 212 and the micro fan 213 form a closed - type impurity recovery channel to avoid secondary attachment of impurities to the screen surface during the cleaning process.

[0044] In Figure 4 and Figure 5 : The cleaning roller 201 uses high - hardness ABS plastic as the support skeleton, and the outer layer of the support skeleton is wrapped with a high - elasticity silica gel layer, and the silica gel layer adopts a micron - level honeycomb - shaped pit design, which is used to increase the dust adsorption area while reducing the contact friction coefficient.

[0045] For this mobile multimedia playback device, by making the cleaning roller 201 use high - hardness ABS plastic as the support skeleton and wrapping the outer layer of the support skeleton with a high - elasticity silica gel layer, it not only ensures the structural strength but also avoids scratches when contacting the screen.

[0046] In Figure 4 、 Figure 5 and Figure 7 : The contact angle between the scraping blade 211 and the cleaning roller 201 is set to 30° - 45°, the scraping blade 211 is made of silica gel material, and the brush plate 210 uses nylon bristles.

[0047] For this mobile multimedia playback device, the 30° - 45° included angle can balance the scraping force and the coverage area, which can not only effectively peel off impurities but also avoid excessive wear of the scraping blade 211 or cleaning residues due to too small an angle. The silica gel has high flexibility and can adaptively deform when contacting the cleaning roller 201, ensuring that the scraping blade 211 is closely attached to the surface of the cleaning roller 201 and improving the impurity removal rate. The nylon bristles have a moderate hardness, can deeply clean the texture of the cleaning roller 201 to remove embedded particles, and at the same time have better anti - bending fatigue performance than natural fibers, which is suitable for high - frequency use. The brush plate 210 and the scraping blade 211 form a "brushing - scraping" dual - effect mechanism, that is, after the brush plate 210 loosens the impurities, the scraping blade 211 quickly peels them off, reducing the probability of secondary pollution.

[0048] In Figure 1 、 Figure 2 、 Figure 4 and Figure 7 : The filter frame 212 and the support frame 204 are magnetically connected.

[0049] The mobile multimedia playing device can facilitate the regular removal of the filter box 212 for cleaning or replacement, so as to ensure the filtering and collection effect of impurities.

[0050] In Figures 1 - 3 and Figure 8 、 Figure 9 : A support mechanism 3 is provided at the front end of the protection plate 401. The support mechanism 3 includes a top frame 301 welded to the moving seat 5, a vertical plate 302 UV-cured and bonded to the protection plate 401, and a bottom frame 307 movably connected to the protection plate 401. A placement frame 305 is movably connected between the vertical plate 302 and the bottom frame 307. The placement frame 305 includes a rectangular groove and a semicircular groove. When the placement frame 305 is in a vertical state, one end of devices such as a keyboard and a remote control is moved into the semicircular groove to achieve limiting. Guide rods 304 are symmetrically arranged at one end of the placement frame 305. Guide grooves 303 that form a sliding structure with the guide rods 304 are provided on the side of the two vertical plates 302 close to each other. The guide grooves 303 include an inclined groove and straight grooves at both ends of the inclined groove. Pin shafts 306 that form a rotating structure with the bottom frame 307 are symmetrically arranged at the other end of the placement frame 305. The bottom frame 307 is provided in a "U" - shaped structure. The top frame 301 includes a cross bar and L - shaped rods symmetrically arranged at the front end of the cross bar.

[0051] For the mobile multimedia playing device, when the protection plate 401 moves vertically downward, the top frame 301 pushes the bottom frame 307 to move vertically upward. Since the bottom end of the placement frame 305 is rotatably connected to the bottom frame 307 through the pin shaft 306 and the top end is slidably connected to the vertical plate 302 through the guide grooves 303 and the guide rods 304, the guide rods 304 at the top end of the placement frame 305 slide along the guide grooves 303 on the inner surface of the vertical plate 302. Since the guide grooves 303 are composed of an inclined groove and straight grooves at both ends of the inclined groove, when the guide rods 304 move from one straight groove to another straight groove, the placement frame 305 is in a horizontal state, so that devices such as a keyboard and a remote control leak out and are placed horizontally, facilitating subsequent operation and use. When the protection plate 401 moves vertically upward, the placement frame 305 gradually resets under the action of its own gravity, so as to realize the automatic storage protection and dust prevention of devices such as a keyboard and a remote control, while reducing the space occupation, and without the need for an additional power source to drive, reducing the energy consumption during use.

[0052] In Figure 1 、 Figure 2 、 Figure 8 and Figure 9 : Movable grooves are symmetrically provided at the front end of the protection plate 401, and limiting rods 309 are arranged inside the movable grooves. Limiting sleeves 308 symmetrically arranged at the rear end of the bottom frame 307 are slidably connected to the surfaces of the limiting rods 309.

[0053] This mobile multimedia playback device can play a role in supporting and guiding the bottom frame 307 through the cooperation of the limit sleeve 308 and the limit rod 309, enabling the bottom frame 307 to move only in the vertical direction, preventing deviation and tilt, and improving stability.

[0054] Working principle: When using this mobile multimedia playback device, the multi-stage electric push rod 403 is operated to contract. Through the sliding action between the protective plate 401 and the player 1, the side frame 402 at the top of the multi-stage electric push rod 403 drives the protective plate 401 to move vertically downward, so as to facilitate the exposure of the screen of the player 1. During this process, the top frame 301 pushes the bottom frame 307 to move vertically upward. Through the rotational action of the placement frame 305 on the bottom frame 307 and the sliding action between the top end and the vertical plate 302, the guide rod 304 at the top of the placement frame 305 slides along the guide groove 303 on the inner surface of the vertical plate 302. When the guide rod 304 moves from one straight groove to another straight groove, the placement frame 305 is in a horizontal state, so as to expose devices such as keyboards and remote controls and place them horizontally. At this time, the player 1 can work to play audio and video, pictures, etc. Moreover, the internal structure and working principle of the player 1 are all prior arts, so no more details will be described here;

[0055] After use, the multi-stage electric push rod 403 is operated to extend, so that the protective plate 401 moves vertically upward, thereby enabling the protective plate 401 to block the screen of the player 1 to achieve protection and dust prevention. During the process of the protective plate 401 moving vertically upward to block and protect the screen of the player 1, through the meshing transmission of the helical gear 205 and the helical tooth plate 206, the driving gear disc group 202 drives the cleaning roller 201 to rotate counterclockwise to clean the screen of the player 1. When the cleaning roller 201 rotates to the end far from the screen, the brush plate 210 and the scraping blade 211 in contact with the surface of the cleaning roller 201 cooperate to remove the attached impurities, and cooperate with the micro fan 213 and the detachable filter frame 212 to filter and collect the impurities, so as to ensure the cleanliness of the contact surface for the next cleaning, ensure the effect of cleaning the screen, and prevent secondary pollution. At the same time, the placement frame 305 gradually resets under the action of its own gravity to achieve automatic storage protection and dust prevention for devices such as keyboards and remote controls;

[0056] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mobile multimedia player device, comprising a player (1) and a mobile base (5), and the player (1) is installed at the top of the mobile base (5). The player (1) includes a housing, a screen installed in the middle of the front end of the housing, and a rear cover installed at the rear end of the housing by screws. It is characterized in that: A protection mechanism (4) connected to the mobile base (5) is provided at the front end of the player (1), and the protection mechanism (4) includes a protection plate (401) movably connected to the front end of the player (1) and side frames (402) symmetrically arranged on both sides of the protection plate (401); A cleaning mechanism (2) connected to the player (1) is penetrated through the top end inside the protection plate (401). The cleaning mechanism (2) includes a cleaning roller (201) penetrating through the protection plate (401) and a support frame (204) detachably connected to the protection plate (401). Both sides of the cleaning roller (201) are connected to the side frames (402) through bearings. A rotating shaft (203) is connected to one end of the side frame (402) far from the cleaning roller (201) through a bearing. A gear disc group (202) is sleeved on the surfaces of the side frame (402) and the rotating shaft (203). And a helical gear (205) is sleeved on one side of the rotating shaft (203) far from the gear disc group (202). A brush plate (210) and a scraping blade (211) are sequentially arranged from top to bottom at the front end of the cleaning roller (201) inside the protection plate (401); A support mechanism (3) is provided at the front end of the protection plate (401). The support mechanism (3) includes a top frame (301) welded to the mobile base (5), a vertical plate (302) adhesively bonded to the protection plate (401) by UV curing, and a bottom frame (307) movably connected to the protection plate (401). A placement frame (305) is movably connected between the vertical plate (302) and the bottom frame (307).

2. The mobile multimedia playback device according to claim 1, wherein: A multi-stage electric push rod (403) is installed between the side frame (402) and the mobile base (5), and the multi-stage electric push rod (403) is symmetrically arranged about the central axis of the protection plate (401).

3. A mobile multimedia playback device according to claim 1, characterized in that: T-shaped plates (404) are symmetrically arranged at the rear end of the protection plate (401). T-shaped grooves (405) which form a sliding structure with the T-shaped plates (404) are symmetrically opened at one end of the player (1) close to the protection plate (401).

4. A mobile multimedia playback device according to claim 1, wherein: The cleaning roller (201) uses high-hardness ABS plastic as a support skeleton, and a high-elastic silicone layer is wrapped outside the support skeleton. And the silicone layer adopts a micron-level honeycomb-shaped pit design to increase the dust adsorption area while reducing the contact friction coefficient.

5. A mobile multimedia playback device according to claim 1, characterized in that: Outer frames (209) are provided on both sides of the player (1). A helical tooth plate (206) meshing with the helical gear (205) is provided inside the outer frame (209). A support rod (207) which forms a sliding structure with the outer frame (209) is provided at one end of the helical tooth plate (206) far from the helical gear (205). A spring (208) is connected between the support rod (207) and the outer frame (209).

6. A mobile multimedia playback device according to claim 1, characterized in that: The contact angle between the scraping blade (211) and the cleaning roller (201) is set to 30°-45°, the scraping blade (211) is made of silica gel, and the brush plate (210) is made of nylon bristles.

7. A mobile multimedia playback device according to claim 1, characterized in that: Miniature fans (213) are equidistantly installed at the bottom end inside the support frame (204), a filter frame (212) is arranged above the miniature fans (213) inside the support frame (204), and the filter frame (212) is magnetically connected to the support frame (204).

8. A mobile multimedia playback device according to claim 1, characterized in that: Guide rods (304) are symmetrically arranged at one end of the placement frame (305), guide grooves (303) which form a sliding structure with the guide rods (304) are formed on the side of the two vertical plates (302) close to each other, and the guide grooves (303) include inclined grooves and straight grooves at both ends of the inclined grooves.

9. The mobile multimedia playback device according to claim 8, characterized in that: Pin shafts (306) which form a rotating structure with the bottom frame (307) are symmetrically arranged at the other end of the placement frame (305).

10. A mobile multimedia playback device according to claim 9, characterized in that: Activity grooves are symmetrically formed at the front end of the protection plate (401), limiting rods (309) are arranged inside the activity grooves, and limiting sleeves (308) symmetrically arranged at the rear end of the bottom frame (307) are slidably connected to the surfaces of the limiting rods (309).

Images