Liquid crystal display screen protection device

Abstract

The liquid crystal display screen protection device comprises a display screen and a fixing frame, a lifting plate is arranged on the back face of the display screen, lifting of the lifting plate is controlled through a lifting mechanism, telescopic frames are movably arranged at the positions, close to the two ends, of the lifting plate, and a cleaning plate is arranged at one end of each telescopic frame; cleaning cotton used for wiping the front face of the display screen is arranged on the inner side of the cleaning plate, a cleaning assembly used for cleaning the cleaning cotton is arranged at the bottom of the display screen, the telescopic frame is controlled to stretch out and draw back through a rail transfer mechanism, and the cleaning plate is connected with a vibration mechanism. According to the invention, the protection plate is folded or unfolded, the protection plate can be used as a sun-shading and rain-shielding shed for protection when the protection plate is unfolded, and when severe weather occurs or the display screen is turned off, the protection plate shields the front surface of the display screen after being folded to form closed protection, so that direct damage of an outdoor environment to the display screen is reduced, and dust accumulation is also avoided; through linkage cooperation of a mechanical structure and motor control, full-automatic cleaning operation is achieved.

Description

Technical Field

[0001] This invention relates to the field of display screen protection technology, and specifically to a liquid crystal display screen protection device. Background Technology

[0002] Outdoor displays are electronic screens installed in open-air environments to display dynamic images, videos, text, and other information. They are used in advertising, transportation, and public services, and can play various commercial advertisements, city promotional videos, public service announcements, air quality indexes, and scenic area guidance information. With continuous technological advancements, outdoor LCD displays are developing towards greater energy efficiency and intelligence. On one hand, they are adopting low-power backlight technology to reduce energy consumption; on the other hand, they are integrating light sensors to automatically adjust screen brightness based on ambient light levels. Some products also support touch interaction functions to enhance user engagement.

[0003] Since the display screen is installed outdoors, and the outdoor environment is harsh, especially in strong winds and rain, the display screen is easily damaged. In addition, dust easily accumulates on the surface of the display screen in the outdoor environment, which affects the viewing effect. If it is cleaned manually regularly, the maintenance cost is high. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid crystal display screen protection device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid crystal display screen protective device, comprising a display screen and a fixing frame, wherein the bottom of the fixing frame is installed on the ground, the display screen is located inside the fixing frame, and a protective plate is provided near the top of the fixing frame. The protective plate is rotated by a motor to be retracted or unfolded, and the protective plate covers the front of the display screen after being retracted.

[0006] The display screen is equipped with a lifting plate on the back, and the lifting plate is controlled to rise and fall by a lifting mechanism;

[0007] The lifting plate is movably equipped with telescopic frames near both ends. One end of the telescopic frame is equipped with a cleaning plate, which is located on the front of the display screen. The inner side of the cleaning plate is equipped with cleaning cotton for wiping the front of the display screen, and the bottom of the display screen is equipped with a cleaning component for cleaning the cleaning cotton.

[0008] The telescopic frame is controlled to extend and retract via a track-changing mechanism, and the cleaning plate is connected to a vibration mechanism.

[0009] When the lifting plate rises, the telescopic frame moves, the cleaning plate moves away from the display screen, and the vibration mechanism is not triggered.

[0010] As the lifting platform descends, the telescopic frame moves again, bringing the cleaning platform closer to the display screen. The vibration mechanism is then activated, causing the cleaning cotton to clean the display screen using vibration.

[0011] Preferably, the track-changing mechanism includes track-changing frames located on both sides of the display screen. One side of the track-changing frame is provided with a trapezoidal guide groove, which is formed by connecting the first guide groove, the second guide groove, and the inclined groove end to end. One side of the telescopic frame is provided with a track-changing guide post, which is slidably connected to the trapezoidal guide groove.

[0012] The telescopic frame is provided with a guide column on one side, and the guide column is slidably connected to the lifting plate. A return spring is sleeved on the guide column.

[0013] When the lifting plate rises, the guide column is located in guide groove one, and the cleaning plate is away from the display screen. When the guide column rises to the top of guide groove one, it enters guide groove two through the inclined groove, so that the cleaning plate is close to the display screen. The lifting plate descends so that the cleaning cotton cleans the display screen. When the guide column descends to the bottom of guide groove two, it returns to guide groove one through the inclined groove.

[0014] Preferably, one end of the guide post is provided with a limiting mechanism for limiting the reset spring. The limiting mechanism includes a fixing block fixedly connected to one end of the guide post. Two limiting blocks are slidably provided inside the fixing block. The two limiting blocks extend to both sides of the fixing block, and a compression spring is provided between the two limiting blocks.

[0015] A limiting plate is provided on one side of the upper end of the trapezoidal guide groove, and the limiting plate has an n-shaped structure.

[0016] When the guide column moves from guide groove one to guide groove two, the reset spring is compressed, and the limiting mechanism is triggered to move, causing the fixed block to move from one side of the limiting plate to the other side, so that the limiting block and the limiting plate form a limiting relationship.

[0017] Preferably, the vibration mechanism includes two sets of guide posts at both ends of the cleaning plate, and a guide block is provided at one end of the telescopic frame. The guide posts are slidably connected to the guide block.

[0018] A turntable is rotatably mounted on the telescopic frame. An eccentric shaft is provided on the end face of the turntable. A driving block is provided at one end of the guide post. A driving groove is provided on the driving block. The eccentric shaft is located inside the driving groove and is movably connected to the driving groove.

[0019] The turntable is coaxially mounted with gears, and a rack is provided on one side of the fixing frame;

[0020] When the lifting platform rises, the telescopic frame moves, and the gear and rack are laterally misaligned. When the lifting platform falls, the telescopic frame moves again, and the gear and rack mesh.

[0021] Preferably, the cleaning component includes a water collection tank fixedly installed at the bottom of the front of the display screen, the bottom of the water collection tank has an inclined structure, and a drain outlet is provided at the bottom of the downward inclined end;

[0022] A water inlet pipe is provided on one side of the water collection tank, and multiple water spray heads are evenly distributed in the radial direction of the water inlet pipe. The water spray heads are embedded in the inner side of the water collection tank.

[0023] In standby mode, the cleaning plate and cleaning cotton are located inside the water collection tank. When the display screen needs to be cleaned, the spray head sprays water onto the cleaning cotton. After the cleaning cotton has finished cleaning the display screen, the spray head sprays water onto the cleaning cotton again to rinse it.

[0024] Preferably, the guide block is provided with adjustment blocks on both sides for adjusting the distance between the cleaning plate and the display screen. The adjustment blocks are installed on the telescopic frame by two bolts, and an adjustment spring is sleeved on the bolt. The adjustment spring is located between the adjustment block and the telescopic frame.

[0025] Preferably, the lifting mechanism includes a lead screw rotatably mounted on a fixed frame, the lead screw being driven to rotate by a motor, a nut block being provided in the middle of the lifting plate, the nut block being threadedly connected to the lead screw, guide rails being provided on both sides of the fixed frame, and the lifting plate being slidably connected to the guide rails up and down by a slider.

[0026] Preferably, the upper end of the fixing frame is provided with a fixing plate, and the upper end of the display screen is mounted on the lower end of the fixing plate via a bracket.

[0027] Preferably, the inner side of the fixing frame is provided with a protective shell for protecting the structural components.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] This invention achieves fully automated cleaning operations, including cleaning preparation, vibration wiping, and self-cleaning reset, through the linkage of mechanical structures and motor control. The vertical movement of the lifting mechanism drives the telescopic frame to extend and retract through the track-changing mechanism, simultaneously realizing the linkage between the cleaning plate's contact with or away from the display screen and the start or stop of the vibration mechanism. That is, during the rising process, the cleaning plate moves away and the vibration mechanism is disconnected; during the falling process, the cleaning plate contacts and the vibration mechanism operates.

[0030] By using the meshing transmission of gears and racks, the vertical motion of the lifting plate is converted into the rotational motion of the turntable. Then, through the cooperation of the eccentric shaft and the drive groove, the rotational motion is converted into the high-frequency reciprocating vibration of the cleaning plate, thereby increasing the wiping force.

[0031] The pre-wetting and post-rinsing of the cleaning cotton is achieved through the spray head of the water collection tank. The inclined water collection tank design ensures that the wastewater is discharged quickly, avoiding the growth of bacteria or residual stains on the cleaning cotton.

[0032] The protective panel is rotated by a motor to be retracted or unfolded. When unfolded, it can be used as a sunshade and rain shelter for protection. In case of severe weather or when the display screen is turned off, the protective panel is retracted to cover the front of the display screen, forming a closed protection, reducing the direct damage of the outdoor environment to the display screen, and also preventing dust accumulation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the protective plate structure after it has been stored according to the present invention;

[0034] Figure 2 This is a schematic diagram of the protective plate structure after it has been unfolded according to the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the present invention after the protective shell has been removed;

[0036] Figure 4 This is a rear view of the present invention after the protective shell has been removed;

[0037] Figure 5 This is a schematic diagram of the mechanism framework of the present invention;

[0038] Figure 6 This is a schematic diagram of the cleaning component structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the track-changing mechanism, the limiting mechanism, and the vibration mechanism of the present invention;

[0040] Figure 8 For the present invention Figure 7 Top view;

[0041] Figure 9 For the present invention Figure 7 Side view;

[0042] Figure 10 This is a schematic diagram of the limiting mechanism of the present invention.

[0043] In the diagram: 1. Display screen; 2. Mounting frame; 21. Mounting plate; 22. Protective shell; 3. Lifting mechanism; 31. Lifting plate; 32. Lead screw; 33. Nut block; 34. Guide rail; 4. Telescopic frame; 41. Guide column one; 5. Cleaning plate; 51. Cleaning cotton; 6. Cleaning components; 61. Water collection tank; 62. Drain outlet; 63. Water inlet pipe; 64. Spray head; 7. Track changing mechanism; 71. Track changing frame; 72. Trapezoidal guide groove; 73. Guide groove one; 74. 75. Guide groove 2; 76. Inclined groove; 77. Guide post for changing track; 78. Reset spring 1; 89. Limiting mechanism; 80. Fixing block; 81. Limiting block; 82. Compression spring; 83. Limiting plate; 90. Vibration mechanism; 91. Guide post 2; 92. Guide block; 921. Adjusting block; 922. Bolt; 923. Adjusting spring; 94. Turntable; 95. Eccentric shaft; 96. Drive block; 97. Drive groove; 98. Gear; 99. Rack; 10. Protective plate. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figure 1-10 The present invention provides a technical solution: a liquid crystal display screen protective device, including a display screen 1 and a fixing frame 2. The bottom of the fixing frame 2 is installed on the ground, and a fixing plate 21 is provided at the upper end of the fixing frame 2. The upper end of the display screen 1 is installed at the lower end of the fixing plate 21 through a bracket. A protective plate 10 is provided near the top of the fixing frame 2. The protective plate 10 is rotated by a motor to be stored or unfolded. After being stored, the protective plate 10 covers the front of the display screen 1. A protective shell 22 for protecting structural components is provided on the inner side of the fixing frame 2.

[0046] The protective plate 10 is rotated by a motor to be retracted or unfolded. When unfolded, it can be used as a sunshade and rain shelter for protection. In case of severe weather or when the display screen 1 is turned off, the protective plate 10 is retracted and covers the front of the display screen 1 to form a closed protection, reducing the direct damage of the outdoor environment to the display screen 1 and preventing dust accumulation.

[0047] The back of the display screen 1 is provided with a lifting plate 31. The lifting plate 31 is controlled to lift by a lifting mechanism 3. The lifting mechanism 3 includes a lead screw 32 rotatably mounted on a fixed frame 2. The lead screw 32 is driven to rotate by a motor. The lifting plate 31 is provided with a nut block 33 in the middle. The nut block 33 is connected to the lead screw 32 by a thread. The fixed frame 2 is provided with guide rails 34 on both sides. The lifting plate 31 is slidably connected to the guide rails 34 by a slider.

[0048] Among them, the lifting mechanism 3 serves as the power source for vertical movement. When the motor of the lifting mechanism 3 is started, it drives the lead screw 32 to rotate, and the nut block 33 drives the lifting plate 31 to move upward along the guide rail 34.

[0049] The lifting plate 31 is equipped with telescopic frames 4 near both ends. One end of the telescopic frame 4 is equipped with a cleaning plate 5, and the cleaning plate 5 is located on the front of the display screen 1. The inner side of the cleaning plate 5 is equipped with a cleaning cotton 51 for wiping the front of the display screen 1. The bottom of the display screen 1 is equipped with a cleaning component 6 for cleaning the cleaning cotton 51.

[0050] The cleaning component 6 includes a water collection tank 61 fixedly installed at the bottom of the front of the display screen 1. The bottom of the water collection tank 61 is inclined, and a drain outlet 62 is provided at the bottom of the downward inclined end. A water inlet pipe 63 is provided on one side of the water collection tank 61. Multiple water spray heads 64 are evenly distributed in the radial direction of the water inlet pipe 63. The water spray heads 64 are embedded inside the water collection tank 61. In standby mode, the cleaning plate 5 and the cleaning cotton 51 are located inside the water collection tank 61. When the display screen 1 needs to be cleaned, the water spray heads 64 spray water on the cleaning cotton 51. After the cleaning cotton 51 has finished cleaning the display screen 1, the water spray heads 64 spray water on the cleaning cotton 51 again to rinse it.

[0051] The telescopic frame 4 is installed near both ends of the lifting plate 31 and can be extended and retracted in the front and back. It provides a base for the installation and movement of the cleaning plate 5. One side of the frame is provided with a guide post 41, which is slidably connected to the lifting plate 31 in the front and back. The cleaning plate 5 is connected to the front end of the telescopic frame 4 and is a long strip that matches the width of the display screen 1. The cleaning cotton 51 fixed inside is made of a flexible material with high water absorption and low wear to avoid scratching the surface of the display screen 1.

[0052] The telescopic frame 4 is controlled to extend and retract via the track-changing mechanism 7. The cleaning plate 5 is connected to the vibration mechanism 9. When the lifting plate 31 rises, the telescopic frame 4 moves away from the display screen 1, and the vibration mechanism 9 is not triggered. When the lifting plate 31 falls, the telescopic frame 4 moves again, and the cleaning plate 5 moves closer to the display screen 1. The vibration mechanism 9 is triggered to run, so that the cleaning cotton 51 cleans the display screen 1 in a vibrating manner.

[0053] The track-changing mechanism 7 includes track-changing frames 71 located on both sides of the display screen 1. One side of the track-changing frame 71 is provided with a trapezoidal guide groove 72, which is connected end to end by a guide groove 1 73, a guide groove 2 74 and an inclined groove 75. One side of the telescopic frame 4 is provided with a track-changing guide post 76, which is slidably connected to the trapezoidal guide groove 72. One side of the telescopic frame 4 is provided with a guide post 1 41, which is slidably connected to the lifting plate 31. A return spring 77 is sleeved on the guide post 1 41. When the lifting plate 31 rises, the track-changing guide post 76 is located in the guide groove 1 73, and the cleaning plate 5 is away from the display screen 1. When the track-changing guide post 76 rises to the top of the guide groove 1 73, it enters the guide groove 2 74 through the inclined groove 75, so that the cleaning plate 5 is close to the display screen 1. The lifting plate 31 descends so that the cleaning cotton 51 cleans the display screen 1. When the track-changing guide post 76 descends to the bottom of the guide groove 2 74, it returns to the guide groove 1 73 through the inclined groove 75.

[0054] The vibration mechanism 9 includes two sets of guide posts 91 at both ends of the cleaning plate 5, a guide block 92 at one end of the telescopic frame 4, the guide posts 91 and the guide block 92 are slidably connected, a turntable 93 is rotatably mounted on the telescopic frame 4, an eccentric shaft 94 is provided on the end face of the turntable 93, a drive block 95 is provided at one end of the guide posts 91, a drive groove 96 is provided on the drive block 95, the eccentric shaft 94 is located inside the drive groove 96, and the eccentric shaft 94 is movably connected to the drive groove 96, a gear 97 is coaxially mounted on the turntable 93, and a rack 98 is mounted on one side of the fixed frame 2. When the lifting plate 31 rises, the telescopic frame 4 moves, and the gear 97 and the rack 98 are laterally offset. When the lifting plate 31 falls, the telescopic frame 4 moves again, and the gear 97 and the rack 98 are meshed.

[0055] One end of the guide post 41 is provided with a limiting mechanism 8 for limiting the return spring 77. The limiting mechanism 8 includes a fixing block 81 fixedly connected to one end of the guide post 41. Two limiting blocks 82 are slidably provided inside the fixing block 81. The two limiting blocks 82 extend to both sides of the fixing block 81. A compression spring 83 is provided between the two limiting blocks 82. A limiting plate 84 is provided on one side of the upper end of the trapezoidal guide groove 72. The limiting plate 84 has an n-shaped structure. When the guide post 76 moves from the first guide groove 73 into the second guide groove 74, the return spring 77 is compressed. The limiting mechanism 8 is triggered at the same time, causing the fixing block 81 to move from one side of the limiting plate 84 to the other side, so that the limiting block 82 and the limiting plate 84 form a limiting relationship.

[0056] During the ascent of the lifting plate 31, the guide column 76 on the telescopic frame 4 slides along the guide groove 73 of the guide frame 71, the cleaning plate 5 remains away from the display screen 1, the gear 97 and the rack 98 are laterally offset, and the vibration mechanism 9 does not work. When the guide column 76 rises to the top of the guide groove 73, it slides into the guide groove 74 through the inclined groove 75. At this time, the return spring 77 is compressed, the telescopic frame 4 extends backward, and the cleaning plate 5 drives the cleaning cotton 51 closer to the display screen 1. Simultaneously, the limiting mechanism 8 is triggered, and the fixing block 81 moves from one side of the limiting plate 84 to the other side. The compression spring 83 first contracts and then rebounds, causing the limiting block 82 to first retract into the fixing block 81, and then extend out through the compression spring 83, so that the limiting block 82 and the limiting plate 84 form a limit, locking the cleaning plate 5 in a fitted state. At the same time as the telescopic frame 4 extends, the gear 97 aligns with the rack 98 on one side of the fixing frame 2. Then the motor of the lifting mechanism 3 reverses, driving the lifting plate 31 to move downward along the guide rail 34. During the descent, the gear 97 meshes with the rack 98. The vertical movement of the lifting plate 31 drives the gear 97 to roll, which in turn drives the turntable 93 to rotate. The eccentric shaft 94 on the turntable 93 drives the drive block 95 to reciprocate through the drive groove 96. The cleaning plate 5 vibrates at high frequency along the second guide post 91. The cleaning cotton 51 wipes the entire front of the display screen 1 in a vibrating manner to remove dust and stains. When the lifting plate 31 descends to the bottom limit position, the cleaning operation is completed. At this time, the guide post 76 on the telescopic frame 4 returns to the first guide groove 73 along the inclined groove 75 at the bottom of the second guide groove 74. The reset spring 77 resets, the telescopic frame 4 retracts, and the cleaning plate 5 drives the cleaning cotton 51 away from the display screen 1 and back into the water collection tank 61. Simultaneously, the gear 97 and the rack 98 are laterally misaligned, and the vibration mechanism 9 stops working.

[0057] Through the linkage of mechanical structure and motor control, a fully automated cleaning operation is achieved, which includes cleaning preparation, vibration wiping, and self-cleaning reset. The vertical movement of the lifting mechanism 3 drives the telescopic frame 4 to extend and retract through the track changing mechanism 7, and simultaneously realizes the linkage between the cleaning plate 5 adhering to or moving away from the display screen 1 and the vibration mechanism 9 starting or stopping. That is, during the rising process, the cleaning plate 5 moves away and the vibration mechanism 9 is disconnected, and during the falling process, the cleaning plate 5 adheres and the vibration mechanism 9 runs.

[0058] By using the meshing transmission of gear 97 and rack 98, the vertical motion of lifting plate 31 is converted into the rotational motion of turntable 93. Then, through the cooperation of eccentric shaft 94 and drive groove 96, the rotational motion is converted into high-frequency reciprocating vibration of cleaning plate 5, thereby increasing the wiping force.

[0059] The pre-wetting and post-rinsing of the cleaning cotton 51 are achieved through the spray head 64 of the water collection tank 61. The inclined water collection tank 61 design ensures that the sewage is discharged quickly, avoiding the growth of bacteria or residual stains on the cleaning cotton 51.

[0060] The guide block 92 has adjustment blocks 921 on both sides for adjusting the distance between the cleaning plate 5 and the display screen 1. The adjustment blocks 921 are installed on the telescopic frame 4 by two bolts 922. An adjustment spring 923 is sleeved on the bolts 922. The adjustment spring 923 is located between the adjustment block 921 and the telescopic frame 4. When installing the cleaning plate 5, the position of the cleaning plate 5 can be adjusted by the bolts 922 so that the cleaning cotton 51 can reasonably squeeze the display screen 1.

[0061] Working principle and usage process of this invention:

[0062] Standby state: The cleaning plate 5 and the cleaning cotton 51 are stored in the water collection tank 61, the telescopic frame 4 is in the retracted state, the cleaning cotton 51 does not contact the display screen 1, the lifting plate 31 is at the bottom position, there is no water spraying in the water collection tank 61, and the drain outlet 62 remains unobstructed.

[0063] Start-up preparation: The cleaning component 6 is started, the water inlet pipe 63 is filled with cleaning water, the spray head 64 sprays water to pre-wet the cleaning cotton 51 in the water collection tank 61, and stops spraying water after wetting is completed.

[0064] Rising switching state: The motor of the lifting mechanism 3 starts, driving the lead screw 32 to rotate, and the nut block 33 drives the lifting plate 31 to move upward along the guide rail 34;

[0065] During the lifting process of the lifting plate 31, the guide column 76 on the telescopic frame 4 slides along the guide groove 73 of the guide frame 71, the cleaning plate 5 stays away from the display screen 1, the gear 97 and the rack 98 are laterally offset, and the vibration mechanism 9 does not work.

[0066] When the guide column 76 rises to the top of the guide groove 1 73, it slides into the guide groove 2 74 through the inclined groove 75. At this time, the reset spring 77 is compressed, the telescopic frame 4 extends backward, and the cleaning plate 5 drives the cleaning cotton 51 to approach the display screen 1.

[0067] Synchronously, the limiting mechanism 8 is triggered, and the fixed block 81 moves from one side of the limiting plate 84 to the other side. The compression spring 83 first contracts and then rebounds, causing the limiting block 82 to first retract into the fixed block 81, and then extend out through the compression spring 83, so that the limiting block 82 and the limiting plate 84 form a limit, locking the cleaning plate 5 in a close fit. At the same time as the telescopic frame 4 extends, the gear 97 aligns with the rack 98 on one side of the fixed frame 2, preparing for the vibration mechanism 9 to start.

[0068] Vibration cleaning during descent: After the lifting plate 31 rises to its top limit position, the motor reverses and drives the lifting plate 31 to move downward along the guide rail 34. During the descent, the gear 97 meshes with the rack 98. The vertical movement of the lifting plate 31 drives the gear 97 to roll, which in turn drives the turntable 93 to rotate. The eccentric shaft 94 on the turntable 93 drives the drive block 95 to reciprocate through the drive groove 96. The cleaning plate 5 vibrates at high frequency along the guide post 91. The cleaning cotton 51 wipes the entire front of the display screen 1 in a vibrating manner to remove dust and stains.

[0069] Cleaning cotton 51 self-cleaning and reset: When the lifting plate 31 descends to the bottom limit position, the cleaning operation is completed. At this time, the guide column 76 on the telescopic frame 4 returns to the guide groove 73 along the inclined groove 75 at the bottom of the guide groove 2 74. The reset spring 77 resets, the telescopic frame 4 retracts, and the cleaning plate 5 drives the cleaning cotton 51 away from the display screen 1 and back into the water collection tank 61. Simultaneously, the gear 97 and the rack 98 are laterally misaligned, and the vibration mechanism 9 stops working.

[0070] The cleaning component 6 is activated again, and the spray head 64 sprays water onto the cleaning cotton 51 to rinse it and remove the stains left during the wiping process. The rinsing wastewater is collected along the inclined bottom of the water collection tank 61 and discharged into the drain outlet 62. After rinsing is completed, the spray head 64 stops spraying water.

[0071] In addition, the protective plate 10 is rotated by a motor to be stored or unfolded. When unfolded, it can be used as a sunshade and rain shelter for protection. In case of severe weather or when the display screen 1 is turned off, the protective plate 10 is stored and covers the front of the display screen 1 to form a closed protection, reducing the direct damage of the outdoor environment to the display screen 1 and preventing dust accumulation.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective device for a liquid crystal display screen, comprising a display screen (1) and a mounting bracket (2), wherein the bottom of the mounting bracket (2) is mounted on the ground, and the display screen (1) is located inside the mounting bracket (2), characterized in that: The fixed frame (2) is provided with a protective plate (10) near the top, the protective plate (10) is stored or unfolded by rotating under the control of a motor, and the protective plate (10) is shielded in front of the display screen (1) after being stored; The back of the display screen (1) is provided with a lifting plate (31), and the lifting plate (31) is controlled to lift by a lifting mechanism (3); The lifting plate (31) is movably provided with a telescopic frame (4) near both ends, one end of the telescopic frame (4) is provided with a cleaning plate (5), and the cleaning plate (5) is located in front of the display screen (1), the inner side of the cleaning plate (5) is provided with cleaning cotton (51) for wiping the front of the display screen (1), and the bottom of the display screen (1) is provided with a cleaning assembly (6) for cleaning the cleaning cotton (51); The telescopic frame (4) is controlled to stretch and retract by a variable rail mechanism (7), and the cleaning plate (5) is connected with a vibrating mechanism (9); When the lifting plate (31) rises, the telescopic frame (4) moves, the cleaning plate (5) moves away from the display screen (1), and the vibrating mechanism (9) is not triggered; When the lifting plate (31) descends, the telescopic frame (4) moves again, the cleaning plate (5) approaches the display screen (1), and the vibrating mechanism (9) triggers operation, so that the cleaning cotton (51) cleans the display screen (1) in a vibrating manner.

2. A liquid crystal display screen protection device according to claim 1, characterized in that: The variable rail mechanism (7) comprises variable rail frames (71) located on both sides of the display screen (1), one side of the variable rail frame (71) is provided with a trapezoidal guide groove (72), the trapezoidal guide groove (72) is connected in sequence by a guide groove one (73), a guide groove two (74) and an inclined groove (75), one side of the telescopic frame (4) is provided with a variable rail guide column (76), and the variable rail guide column (76) is in sliding connection with the trapezoidal guide groove (72); One side of the telescopic frame (4) is provided with a guide column one (41), the guide column one (41) is in sliding connection with the lifting plate (31) front and back, and the guide column one (41) is sleeved with a reset spring (77); When the lifting plate (31) rises, the variable rail guide column (76) is located in the guide groove one (73), the cleaning plate (5) moves away from the display screen (1), when the variable rail guide column (76) rises to the top of the guide groove one (73), it enters the guide groove two (74) through the inclined groove (75), so that the cleaning plate (5) approaches the display screen (1), the lifting plate (31) descends, and the cleaning cotton (51) cleans the display screen (1), when the variable rail guide column (76) descends to the bottom of the guide groove two (74), it returns to the guide groove one (73) through the inclined groove (75).

3. A liquid crystal display screen protection device according to claim 2, wherein: One end of the guide column one (41) is provided with a limiting mechanism (8) for limiting the reset spring (77), the limiting mechanism (8) comprises a fixed block (81) fixedly connected with one end of the guide column one (41), two limiting blocks (82) are slidably arranged in the fixed block (81), the two limiting blocks (82) extend to both sides of the fixed block (81), and a compression spring (83) is arranged between the two limiting blocks (82); The upper end of the trapezoidal guide groove (72) is provided with a limiting plate (84), and the limiting plate (84) is an n-shaped structure; When the guide column (76) enters the guide slot two (74) from the guide slot one (73), the reset spring (77) is compressed, the limiting mechanism (8) is triggered to operate, the fixed block (81) moves from one side of the limiting plate (84) to the other side, and the limiting block (82) forms a limiting relationship with the limiting plate (84).

4. The liquid crystal display screen protection device of claim 1, wherein: The vibration mechanism (9) comprises two groups of guide columns two (91) at both ends of the cleaning plate (5), and one end of the telescopic frame (4) is provided with a guide block (92). The telescopic frame (4) is rotatably provided with a rotating disc (93), the end surface of the rotating disc (93) is provided with an eccentric shaft (94), one end of the guide column two (91) is provided with a driving block (95), the driving block (95) is provided with a driving groove (96), the eccentric shaft (94) is located in the driving groove (96), and the eccentric shaft (94) is movably connected with the driving groove (96). The rotating disc (93) is coaxially provided with a gear (97), and one side of the fixed frame (2) is provided with a rack (98). When the lifting plate (31) rises, the telescopic frame (4) moves, the gear (97) is transversely staggered with the rack (98), when the lifting plate (31) descends, the telescopic frame (4) moves again, and the gear (97) is in meshing connection with the rack (98).

5. The liquid crystal display screen protection device of claim 1, wherein: The cleaning assembly (6) comprises a water collecting groove (61) fixedly installed on the front bottom of the display screen (1), the bottom of the water collecting groove (61) is of an inclined structure, and the bottom of the downwardly inclined end is provided with a water outlet (62). One side of the water collecting groove (61) is provided with a water inlet pipe (63), a plurality of water spraying heads (64) are uniformly distributed in the radial direction of the water inlet pipe (63), and the water spraying heads (64) are inlaid in the inner side of the water collecting groove (61). When waiting, the cleaning plate (5) and the cleaning cotton (51) are located in the water collecting groove (61), when it is necessary to clean the display screen (1), the water spraying heads (64) spray water on the cleaning cotton (51), and after the cleaning cotton (51) cleans the display screen (1), the water spraying heads (64) spray water on the cleaning cotton (51) again for flushing.

6. A liquid crystal display screen protection device according to claim 4, wherein: The guide block (92) is provided with adjusting blocks (921) on both sides for adjusting the distance between the cleaning plate (5) and the display screen (1), the adjusting blocks (921) are installed on the telescopic frame (4) through two bolts (922), the bolts (922) are provided with adjusting springs (923), and the adjusting springs (923) are located between the adjusting blocks (921) and the telescopic frame (4).

7. The LCD protection device of claim 1, wherein: The lifting mechanism (3) comprises a lead screw (32) rotatably installed on the fixed frame (2), the lead screw (32) is driven to rotate by a motor, the middle part of the lifting plate (31) is provided with a nut block (33), the nut block (33) is connected with the lead screw (32) through threads, both sides of the fixed frame (2) are provided with guide rails (34), and the lifting plate (31) is slidably connected with the guide rails (34) through a sliding block.

8. The liquid crystal display screen protection device of claim 1, wherein: The fixed frame (2) is provided with a fixed plate (21) at the upper end, and the display screen (1) is installed on the lower end of the fixed plate (21) through a support.

9. The liquid crystal display screen protection device of claim 1, wherein: The fixed frame (2) is internally provided with a protective shell (22) for the protective structure.

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