A display polarizer thermal cleaning system

Abstract

The present invention relates to the field of polarizer removal technology, specifically a display screen polarizer thermal cleaning system, comprising: a frame; a workbench; a driving device; an electric heating plate; a vacuum adsorption unit, and a detection device; after the electric heating plate heats the liquid crystal screen, the vacuum adsorption unit tightly adsorbs the polarizer on the surface of the liquid crystal screen, and the vacuum adsorption unit cooperates with the driving device to pull the polarizer off the surface of the liquid crystal screen when the driving device drives the liquid crystal screen to move horizontally. Compared with existing display screen polarizer thermal cleaning systems, the display screen polarizer thermal cleaning system of the present invention reduces the time required for manual adjustment of the scraper height each time the polarizer is scraped off a different liquid crystal screen, thereby improving the convenience of the equipment. At the same time, it can effectively avoid the occurrence of screen glass of the liquid crystal screen being squeezed and broken during the production process due to deviation in the adjustment of the scraper height, thereby improving the stability of production.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal screens, and in particular to a thermal cleaning system for polarizers on a display screen. Background Art

[0002] The full name of polarizer is polarizing film. The imaging of LCD screens of mobile phones, computers and other devices must rely on polarized light. During the production of LCD screens, if the polarizer is not pasted properly, the polarizer on the screen needs to be scraped off and reworked. When the polarizer is damaged, it is necessary to replace the polarizer. The original polarizer on the screen also needs to be scraped off and a new polarizer needs to be pasted again.

[0003] Partial polarizer removal technology. In order to improve the efficiency of polarizer removal, someone has produced a polarizer shoveling machine. The polarizer shoveling machine places the LCD screen flat on the workbench, moves a heated scraper from top to bottom, adjusts the distance between the scraper and the screen, and makes the polarizer on the LCD screen coincide with the bottom of the scraper in height, while the glass surface of the LCD screen does not coincide with the scraper in height. Then control the workbench to move the LCD screen in the direction of the scraper. After the LCD screen passes the scraper, the polarizer on the screen is hung by the scraper, and the glass of the screen will continue to move toward the rear of the scraper with the workbench, thereby separating the polarizer from the glass of the screen in preparation for subsequent rework of the screen. The Chinese patent with application number CN202221900823.6 and name “A LCM Thinned Glass Polarizer Repair and Disassembly Machine” also uses the principle of the above-mentioned polarizer shoveling machine to separate the polarizer of the screen.

[0004] However, when using the above method to scrape the polarizer, the thickness of the polarizer is generally between 0.135-0.225mm, and the setting range for the height between the scraper and the screen glass can only be between 0-0.225mm, and the precision requirement is very high. If the distance between the scraper and the screen glass is greater than the thickness of the polarizer, the scraper will not be able to scrape the polarizer; and if the height of the scraper is lower than the height of the screen glass, then as the workbench drives the screen toward the scraper, the scraper will squeeze the screen glass and the screen glass will be damaged. Moreover, the glass thickness and polarizer thickness of different types of LCD screens are different, and the polarizer scraper needs to be adjusted every time it is used, which is inconvenient to use.

[0005] Therefore, a display polarizer thermal cleaning system is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a display screen polarizer thermal cleaning system to solve the problem raised in the above-mentioned background technology that the screen glass of the liquid crystal screen is easily squeezed and damaged due to the deviation in the setting of the scraper distance when scraping the polarizer, improve the process stability when scraping the polarizer of the liquid crystal screen, and at the same time improve the ease of use of the equipment, so that the equipment can automatically adapt when removing polarizers from different models of LCD screens without the need for manual adjustment.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A display polarizer thermal cleaning system, comprising:

[0009] A rack, the rack being fixedly mounted on a bottom surface or a table;

[0010] A workbench, wherein the frame is horizontally provided with a workbench for supporting the LCD screen, and a fixing device for fixing the LCD screen is provided on the surface of the workbench. The fixing device may be a mechanical clamping method, a method of fixing the LCD screen on the workbench by vacuum adsorption, or other types of fixing methods;

[0011] The bottom of the workbench is provided with a driving device 1 for driving the workbench to move horizontally. The driving device can be a cylinder, an electric cylinder, an electric push rod, or a connecting rod to push the workbench to move horizontally. Other devices or mechanisms that can have the same functions as mentioned above can also be used to drive the workbench to move horizontally; the upper side of the workbench is provided with an electric heating plate for heating the LCD screen. The electric heating plate can be a stainless steel electric heating plate, a ceramic electric heating plate, a cast aluminum electric heating plate, a cast copper electric heating plate or other types of electric heating plates. The heating temperature of the electric heating plate is in the range of 80°C-250°C. The electric heating plate is plate-shaped, and the width of the electric heating plate is not less than the width of the LCD screen fixed on the workbench, so that the LCD screen can be fully heated;

[0012] The frame is also provided with a vacuum adsorption part, which is a device for adsorbing the polarizer on the surface of the liquid crystal screen by vacuuming. The vacuum adsorption part is externally connected to a vacuum pump and a gas tank; the frame is also provided with a detection device for detecting the distance between the vacuum adsorption part and the surface of the liquid crystal screen. The detection device can perform detection by laser detection or ultrasonic detection, or other detection methods. When the distance between the vacuum adsorption part and the surface of the liquid crystal screen is initially set, it can be adjusted by the detection device. The electric heating plate heats the liquid crystal screen until it exceeds the softening temperature of the UV glue used when the screen is pasted with the polarizer. The UV glue bonding the polarizer and the screen begins to soften, and the vacuum adsorption part is always in an air suction state. Subsequently, when the driving device drives the vacuum adsorption part to move horizontally to the bottom of the vacuum adsorption part, the air suction port of the vacuum adsorption part is blocked by the liquid crystal screen. After the air pressure of the vacuum adsorption part changes, the vacuum adsorption part adsorbs the polarizer on the surface of the liquid crystal screen and maintains the set pressure. Subsequently, the vacuum adsorption part rotates in the direction of the driving device. Since the vacuum adsorption part pulls the polarizer on the surface of the screen, the driving device moves horizontally forward with the liquid crystal screen, and the UV glue used to paste the polarizer on the liquid crystal screen decreases in viscosity after softening, at this time, as the vacuum adsorption part rotates with the polarizer, and the liquid crystal screen moves horizontally under the drive of the driving device, the polarizer on the liquid crystal screen can be torn off. When the vacuum adsorption unit absorbs the polarizer and rotates, in order to prevent the screen glass of the LCD screen from being damaged during the pulling process of the polarizer, the linear speed of the vacuum adsorption unit during rotation should be the same as the linear speed of the driving device driving the LCD screen to ensure that the screen glass of the LCD screen is evenly stressed during the pulling process and the screen glass is protected from damage.

[0013] At the same time, because it adopts the adsorption method, under the premise of fully heating the screen and completely softening the UV glue, by adjusting the size of the suction force, the distance between the vacuum adsorption part and the polarizer can be adsorbed to the polarizer as long as it is less than 0.5mm. Therefore, a certain error can be left when setting the distance. Even if the thickness of the polarizer used is different, the damage to the screen glass during the removal of the polarizer can be avoided as much as possible, thereby improving the stability of the production process. Because there is enough reserved space, when removing the polarizer of different models of LCD screens, the time for adjusting the equipment to reach the required accuracy can be reduced, thereby improving the convenience of the equipment and the production efficiency.

[0014] Preferably, the vacuum adsorption part includes a cylindrical pressure block horizontally arranged above the workbench, the axis of the cylindrical pressure block is parallel to the upper surface of the workbench, and the parallelism tolerance between the cylindrical pressure block and the workbench is less than or equal to 0.2mm. The frame is also provided with a second driving device, which can drive the pressure block to move linearly up and down. A plurality of vacuum suction cups are fixedly installed on the pressure block, and the vacuum suction cups are made of a polymer material such as polyurethane, nitrile rubber or vinyl. The plurality of vacuum suction cups are evenly arranged in multiple rows along the axis direction of the pressure block, and the vacuum suction cups in the same row are connected to each other. The suction cup end faces of the vacuum suction cups in each row are on the same surface, and the parallelism tolerance between the suction cup end faces of each suction cup is 0.1mm or less than 0.1mm, and the vacuum suction cups in each row are independently connected to an external vacuum pump. The circumference of the vacuum suction cups in multiple rows is evenly distributed on the surface of the pressure block, and the output end of the second driving device is horizontally connected to a motor one, and the output end of the motor one is coaxially fixedly connected to the end face of the pressure block and drives the pressure block to rotate. The cylindrical pressure block is conducive to allowing the vacuum suction cups evenly distributed on its surface to rotate evenly along the same trajectory. Under normal circumstances, for objects of the same mass, the mass distribution of the cylinder is more concentrated in the center and closer to the axis of rotation. Therefore, the moment of inertia generated during rotation is smaller than that of the prismatic shape, which can make the vacuum suction cup rotate more smoothly during the process and better adsorb the polarizer. At the same time, the pulling force on the LCD screen during the vacuum suction cup adsorbing and pulling the polarizer is more uniform, which helps to ensure that the LCD screen will not be damaged during the pulling process.

[0015] The axis of the cylindrical pressure block is parallel to the surface of the workbench, with a parallelism tolerance of less than or equal to 0.2mm. This is to ensure that each vacuum suction cup in each row can better absorb the polarizer when it is rotated to be perpendicular to the polarizer. However, if the parallelism tolerance between the axis of the cylindrical pressure block and the workbench is greater than 0.2mm, some of the vacuum suction cups will have gaps with the polarizer during the rotation of the pressure block due to non-parallelism. As a result, the vacuum suction cups cannot generate sufficient suction, and thus cannot pull the polarizer off the LCD screen.

[0016] During use, the drive unit drives the pressure block up and down, and can cooperate with the detection device to automatically detect the height between the pressure block and the LCD screen. This can automatically adjust the height of the pressure block to the appropriate position when removing the polarizer from different LCD screen models, thereby improving the automation level of the equipment. When the second drive unit drives the pressure block to the set position, all vacuum suction cups begin to pump air. In the initial position, one row of vacuum suction cups is set directly below the pressure block and facing vertically downward. When the LCD screen passes under it, the vacuum suction cups in this row absorb the polarizer on the screen surface. After the system determines that the vacuum suction cups in this row have absorbed something, it maintains pressure on this row and then controls the motor to cooperate with the first drive unit to begin rotating at the same linear speed as the first drive unit. The rotating motor first also starts to drive the pressure block to rotate in the direction of the LCD screen and cooperate with the first drive unit to pull the polarizer off the LCD screen. When the other row of vacuum suction cups on the pressure block contacts the polarizer on the LCD screen due to the rotation of the pressure block, they also absorb the polarizer and begin to pull the polarizer on the LCD screen. As the clamp rotates, the polarizer is completely pulled off the LCD screen once the drive mechanism completely releases it from the vacuum cups. A laser sensor can then be set up to detect when the LCD screen has completely left the clamp to determine if the polarizer has been completely pulled off. Once the polarizer is completely pulled off the LCD screen, each vacuum cup begins blowing air, releasing the attached polarizer from the clamp and blowing it off.

[0017] After the polarizer is attached to the vacuum cups, the angle between them changes as the drive mechanism moves the LCD screen away from the cups. If a gap forms between the polarizer and any of the cups as the LCD screen moves away from the cups, the cups' adhesion will decrease or even fail. By evenly distributing multiple rows of vacuum cups around the circumference of a cylindrical pressure block, as the LCD screen moves horizontally, the next row of vacuum cups rotates into contact with the polarizer, allowing the new vacuum cups to reattach the polarizer. The angle between the polarizer at that location and the surface of the vacuum cup in that row restarts from zero. This improves the stability of polarizer adhesion and ensures stable equipment operation.

[0018] Preferably, the electric heating plate is fixedly connected to the output end of the second driving device, and the pressure block is rotatably installed on the electric heating plate and is located behind the electric heating plate in the horizontal movement direction of the liquid crystal screen. In order to ensure that the vacuum suction cup can rotate smoothly when the pressure block rotates and prevent the vacuum suction cup from squeezing the liquid crystal screen, the end face of each vacuum suction cup is made of soft rubber. When each vacuum suction cup is rotated to a position directly below the pressure block, the lowest point of the vacuum suction cup is 0.5mm higher than the bottom of the electric heating plate. The 0.5mm gap can further reduce the squeezing of the liquid crystal screen by the vacuum suction cup during rotation, ensure the smoothness of the rotation process of the vacuum suction cup, avoid damage to the liquid crystal screen, and also ensure that the vacuum suction cup has sufficient suction force on the polarizer. The position between the electric heating plate and the pressure block is relatively fixed, and is driven up and down by the second driving device at the same time. The detection device is a pressure sensor fixedly installed between the heating plate and the output end of the driving device. The advantage of using a pressure sensor in the detection device is that it can automatically adapt to the height according to the thickness of the LCD screen, and can ensure that each time the LCD screen moves under the pressure block, the vacuum suction cup can contact the polarizer, and adsorb the polarizer on the surface of the LCD screen through its own suction, thereby ensuring the stability of the equipment. When in use, the second driving device drives the electric heating plate and the pressure block to move downward at the same time. At this time, the electric heating plate is aligned with the LCD screen. When the electric heating plate gradually descends and sticks to the LCD screen, the pressure sensor will detect the pressure between the LCD screen and the electric heating plate, and set a value as the standard value detected by the pressure sensor. The standard value is set to be less than or equal to 0.5N. After reaching the set pressure, the second driving device stops moving downward. A pressure less than or equal to 0.5N can ensure that the LCD screen will not break during the extrusion process, thereby improving the stability of the equipment during use. When the pressure reaches the set pressure, the second driving device stops, and the electric heating plate heats the LCD screen, so that the UV glue on the LCD screen softens. After the set heating time, the first driving device starts The workbench and the LCD screen thereon are driven to move horizontally toward the pressing block. The vacuum suction cup on the pressing block absorbs the polarizer on the LCD screen and then starts to cooperate with the driving device 1 to rotate at the same linear speed and pull the polarizer off the LCD screen. At this time, a part of the LCD screen is still between the workbench and the electric heating plate, and is limited in the vertical direction by the workbench and the electric heating plate. This can effectively offset the upward pulling force of the vacuum suction cup, and prevent the LCD screen from falling off the fixing device of the workbench due to the pulling of the polarizer by the vacuum suction cup. At the same time, it can also make the force on the LCD screen more stable when the polarizer is pulled off from the LCD screen, ensuring that the screen glass of the LCD screen will not be damaged, further improving the use effect of the equipment.

[0019] Preferably, the electric heating plate is also connected to a pressing plate. The pressing plate can be made of metal, or ABS, PE, PP, or other plastics with similar properties. When made of metal, the surface roughness of the bottom of the pressing plate is lower than Ra0.6 to ensure that the screen glass will not be damaged after contact with the screen glass from which the polarizer has been peeled. The pressing plate is located behind the pressing block and cooperates with the electric heating plate to sandwich the pressing block. The bottom of the pressing plate is flush with the bottom of the electric heating plate. After the polarizer is peeled off by the vacuum suction cup, the LCD screen will enter under the pressing plate. The pressing plate will cooperate with the workbench to continue to limit the screen glass in vertical height, further reducing the force on the peeling point between the non-polarizer and the screen glass, further ensuring that the screen glass of the LCD screen will not be damaged when the polarizer is peeled off, and further improving the use effect.

[0020] Preferably, a protrusion with a triangular cross-section is fixedly mounted on the underside of the pressure plate. The bottom of the protrusion is flush with the pressure plate, and the tip of the triangular protrusion is horizontally oriented toward the pressure plate. The angle of the protrusion tip is less than 30 degrees. After the vacuum suction cups pull up the polarizer, as the LCD screen continues to move horizontally, the tip of the triangular protrusion will be inserted into the opening gap between the polarizer and the screen glass. When the vacuum suction cups have an adsorption gap with the polarizer, resulting in insufficient suction and causing the polarizer to fall off, the tip of the protrusion can continuously insert between the polarizer and the screen glass as the LCD screen moves horizontally, scraping the polarizer off. The triangular protrusion also guides the polarizer diagonally upward to prevent the scraped polarizer from accumulating between the pressure plate and the pressure plate. The angle of the protrusion tip less than 30 degrees can better guide the polarizer upward. When the next row of vacuum suction cups rotates to directly below the pressure block, they will resume adsorption and pulling of the polarizer. The setting of the bumps further ensures the stability of the system's effect when removing the polarizer.

[0021] Preferably, a plurality of levers are provided on the upper side of the electric heating plate, each of the levers is tangent to the pressing block, and the front end of each lever is chamfered with an arc, and the plurality of levers are evenly arranged along the axial direction of the pressing block, and the plurality of levers correspond to the gaps between the plurality of vacuum suction cups in each row, and are respectively inserted into the gaps between the corresponding vacuum suction cups in the opposite direction of rotation of the pressing block. When the polarizer is pulled by the vacuum suction cup and rotates with the pressing block, when it rotates and passes the position of the lever, the plurality of levers will peel off the polarizer from the vacuum suction cup of the row, preventing the polarizer from continuing to rotate with the pressing plate, allowing the vacuum suction cup of the row from which the polarizer has been peeled off to rotate back to the bottom to continue to adsorb and pull the polarizer, thereby freeing the vacuum suction cup of the row and improving the utilization rate of the suction cup. At the same time, it can also avoid the situation where the polarizer is wrapped around the pressing block in multiple layers and it is difficult to remove the polarizer from the pressing block by blowing air from the vacuum suction cup, thereby improving the continuity of use of the equipment. It should be noted that the distance between the endpoint of the non-fixed end of the lever and the tangent point between the lever and the pressing block should be less than the height of a vacuum suction cup. This is because if the lever is vertically tangent to the pressure block, when the vacuum suction cup rotates to be perpendicular to the lever, if the distance between the end point of the non-fixed end of the lever and the tangent point is greater than the height of one vacuum suction cup, when the vacuum suction cup adsorbs the polarizer and rotates to the lever with the pressure block, the polarizer will not be able to rotate past the lever and will be peeled off above the pressure block. When more and more polarizers are peeled off, it will cause accumulation and affect the rotation of the pressure block. If the distance between the non-fixed end of the lever and the tangent point is less than the height of one vacuum suction cup, the polarizer can rotate past the lever and be peeled off from the side of the pressure block by the lever when the pressure block returns. In this way, the polarizer will fall from the side of the pressure block under the action of gravity, and will not accumulate above the pressure block, ensuring the operational stability of the equipment. As the lever tilts, the lever becomes a hypotenuse. As long as the distance between the end point of the non-fixed end and the tangent point is less than the height of one vacuum suction cup, the above requirements will be met.

[0022] Preferably, a collection trough is fixedly mounted on the upper side of the heating plate, with the opening of the sidewall of the collection trough facing the pressing block. The bottom of the lever is fixed to the front end of the opening of the collection trough. The lever is tilted upward from the inside of the collection trough toward the pressing block and is tangent to the pressing block. The tilt angle of the lever is greater than 30° and less than 60°. After the lever peels the polarizer from the pressing block, the removed polarizer falls into the collection trough and is collected, facilitating subsequent manual processing and eliminating the need for manual cleaning after each polarizer removal. At the same time, the removed polarizer is prevented from interfering with the removal of the polarizer for the next LCD screen, thereby improving the operational continuity of the equipment. Because the lever is tilted and the bottom end of the lever is tangent to the pressing block, it is difficult to provide a support structure at the bottom of the lever. To ensure that the lever does not deform due to the pulling of the polarizer when peeling the polarizer from the vacuum suction cup for a long time, the lever needs to be made of steel and have a thickness of not less than 3mm. The inclined lever is located at the side wall opening of the collection tank, which enables the lever to smoothly guide the polarizer from the vacuum suction cup to the inside of the collection tank after it is peeled off. At the same time, the gravity of the polarizer is used to prevent the polarizer from piling up at the opening of the collection tank after being peeled off from the vacuum suction cup. When the slope is greater than 30°, the lever with a certain slope can allow the peeled polarizer to be guided to the inside of the collection tank more smoothly by utilizing the rotational inertia of the polarizer driven by the pressure block and the guiding effect of the lever. When it is less than 30°, the tilt angle of the lever is reduced and the guiding effect is improved. The polarizer will easily accumulate on the lever. If the angle of the lever is greater than 60°, the polarizer guided into the collection tank will easily accumulate at the intersection of the collection tank and the lever after it contacts the bottom of the collection tank because the transition angle becomes smaller and the guiding effect is also reduced, resulting in a decrease in the utilization rate of the space behind the collection tank. The polarizer accumulated at the intersection of the collection tank and the lever will affect the subsequent polarizer peeling and collection when it is higher than the height of the lever. Therefore, it is more reasonable to set the lever inclination angle between 30°-60°.

[0023] Preferably, a storage box for storing alcohol is provided on one side of the pressing plate close to the pressing block. The storage box can be made of PVC, PS, PE, PP or other types of plastic. A sponge roller is horizontally rotatably installed on the bottom of the pressing plate. The axial direction of the sponge roller is the same as the axial direction of the pressing block, that is, perpendicular to the horizontal forward direction of the LCD screen. A connecting pipe is provided between the sponge roller and the storage box for allowing alcohol to drip onto the surface of the sponge roller. The diameter of the connecting pipe is between 1-1.5mm (including the end points). Because the pore size less than 1mm is prone to clogging after long-term use, and the diameter greater than 1.5mm is easy to get clogged. The alcohol inside the storage box is likely to flow out from the connecting pipe naturally under the action of gravity, resulting in alcohol waste. At the same time, the density of the sponge roller is between 70-80H. Sponges with a density lower than 70H are likely to allow alcohol to leak from the connecting pipe, while sponges with a density higher than 80H are unlikely to evenly transport the alcohol to every part of the sponge roller through capillary action, making it difficult to coat the entire screen glass. In order to ensure that the sponge can evenly contact the surface of the screen glass, the lowest point of the sponge roller is 0.5-1mm lower than the bottom of the pressure plate. Because the sponge roller can deform during squeezing, and because the sponge roller is softer than the screen glass, the screen glass will not be damaged. A plurality of scraping strips are also provided at the bottom of the pressure plate. The scraping strips can be made of soft rubber or silicone. Each of the scraping strips is parallel to the axis of the sponge roller. The cross-section of each scraping strip is a downward semicircular shape. The lowest point of each scraping strip is 0.3-0.5mm lower than the bottom of the pressure plate. The reason for being lower than 0.3-0.5mm is to be able to scrape off the UV glue on the screen glass. The semicircular shape is to prevent the screen glass from being stuck at the bottom of the pressure plate and to serve as a guide. At the same time, the soft scraping strip can also be deformed by extrusion without hindering the movement of the screen glass and will not squeeze and damage the screen glass. The principle is as follows: when the screen glass with the polarizer removed enters under the pressure plate, the sponge roller will be squeezed when passing through the sponge roller and rotate with the horizontal drive of the screen glass. The sponge roller will use capillary action to evenly transport the alcohol inside the connecting pipe above to every part of the sponge roller, and evenly apply it to the screen glass as the screen glass rotates. The alcohol will dissolve the UV glue on the screen glass. Then the screen glass will pass through multiple scrapers, which will scrape off the alcohol and UV glue on the screen glass, reducing the subsequent manual cleaning steps of the UV glue, improving the use effect of the equipment, and improving production efficiency.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Compared with the existing method of scraping off polarizers with a scraper, the thermal cleaning system for display screen polarizers described in the present invention utilizes a method in which a vacuum suction cup is pressed against the polarizer on the surface of the liquid crystal screen from top to bottom and adsorbs it, and then the polarizer on the surface of the liquid crystal screen is pulled and removed by vacuum adsorption. A pressure sensor is used to detect and feedback the system, so that the vacuum suction cup automatically adapts to the thickness of the liquid crystal screen, reducing the time required for manual adjustment of the scraper height each time the polarizer is scraped off a different liquid crystal screen, thereby improving the convenience of the equipment. At the same time, the use of adsorption and pulling instead of squeezing and scraping to remove the polarizer can effectively avoid the squeezing and breakage of the LCD screen glass during the production process due to deviation in the scraper height adjustment, thereby improving the stability of production.

[0026] 2. The present invention provides a display screen polarizer thermal cleaning system. Based on the above-mentioned beneficial effects, the electric heating plate is used to heat the polarizer in close contact with the upper surface of the liquid crystal screen, thereby improving the heating efficiency of the polarizer. At the same time, the pressing block and the vacuum suction cup are arranged behind the electric heating plate to ensure that the polarizer has been fully heated before the vacuum suction cup adsorbs and pulls the polarizer, thereby ensuring the removal effect of the polarizer. At the same time, when the electric heating plate pulls the polarizer with the vacuum suction cup, the pressing block is used to press and limit the part of the liquid crystal screen from which the polarizer has been pulled off, thereby avoiding damage to the screen glass due to uneven force during the pulling of the polarizer, further ensuring the operating stability of the equipment, and ensuring the product integrity of the screen glass after the polarizer is removed.

[0027] 3. The thermal cleaning system for display screen polarizers described in the present invention further configures the pressing block into a cylindrical shape, and evenly distributes a plurality of vacuum suction cups on the outer surface of the pressing block. The pressing block absorbs the polarizer and then rotates, and cooperates with the workbench to drive the horizontal movement of the liquid crystal screen to pull the polarizer off the liquid crystal screen. The plurality of vacuum suction cups evenly distributed on the pressing block can ensure that a new vacuum suction cup rotates to contact the polarizer after a set distance and re-absorbs the polarizer. Compared with the method of pulling the polarizer off vertically or the method of fixing the vacuum suction cup and pulling the polarizer off by the horizontal movement of the liquid crystal screen, It can effectively prevent the vacuum suction cup from leaking the polarizer due to the change in the angle between the polarizer and the vacuum suction cup during the relative movement between the LCD screen and the vacuum suction cup, and prevent the polarizer from falling during the adsorption and pulling process of the vacuum suction cup, further improving the stability of the equipment when removing the polarizer. At the same time, a pressing plate is set behind the pressing block to further ensure the stability of the force on the screen glass during the removal of the polarizer, and a scraper and a sponge roller are set on the pressing plate to clean the UV glue remaining on the surface of the screen glass after the polarizer is removed, reducing the subsequent cleaning steps required and improving the convenience of the equipment production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 It is a front view of the present invention;

[0030] Figure 3 For the present invention Figure 2 Middle AA section view;

[0031] Figure 4 For the present invention Figure 3 Enlarged view of middle B;

[0032] Figure 5 This is a schematic diagram of the structure of the present invention when the polarizer is removed;

[0033] Figure 6 Schematic diagram of the structure of the workbench and the driving device in the first embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the structure of the workbench and the driving device 1 in the second embodiment of the present invention.

[0035] In the figure: 1. Frame; 2. Workbench; 3. Fixing device; 4. Driving device 1; 5. Electric heating plate; 6. Pressing block; 7. Vacuum suction cup; 8. Driving device 2; 9. Detection device; 10. Motor 1; 11. Pressing plate; 12. Bump; 13. Push rod; 14. Collecting tank; 15. Storage box; 16. Sponge roller; 17. Connecting pipe; 18. Scraper; 19. Polarizer; 20. Screen glass; 21. Horizontal plate; 22. Mounting plate; 23. Rotary joint; 24. Polished rod bolt. DETAILED DESCRIPTION

[0036] Example 1: The polarizer removal target is a 6.39-inch mobile phone LCD screen.

[0037] refer to Figures 1 to 6 , a display polarizer thermal cleaning system, wherein:

[0038] The frame 1 is fixedly installed horizontally on the ground, the workbench 2 is slidably installed horizontally on the frame 1, and the driving device 4 is arranged on the frame 1 below the workbench 2. The driving device 4 adopts an electric screw to drive the workbench 2 horizontally, and cooperates with the slide rail to enable the workbench 2 to run smoothly. The fixing device 3 is arranged on the upper surface of the workbench 2. The fixing device 3 adopts the form of vacuum adsorption. A groove with the same size as the LCD screen is started on the workbench 2. A plurality of adsorption holes are opened inside the groove. Each adsorption hole is interconnected and connected to an external vacuum generator. The vacuum generator controls its vacuum to perform vacuum adsorption on the bottom of the LCD screen. The driving device 28 also adopts an electric screw rod. A cross plate 21 is fixedly installed on the driving device 28. The driving device 28 drives the cross plate 21 to move horizontally up and down. A mounting plate 22 is horizontally installed below the cross plate 21 with four light rod bolts 24. The mounting plate 22 can slide up and down along the four light rod bolts 24. A detection device 9 is set between the mounting plate 22 and the cross plate 21. The detection device 9 is a pressure sensor (described later). The model of the pressure sensor is FMZJ-1kg, and the measuring range is 0-1kg. After the pressure sensor is set between the mounting plate 22 and the cross plate 21, the mounting plate 22 can no longer slide up and down. In the initial state, the pressure between the pressure sensor and the mounting plate 22 is zero. A pressure block 6 is installed horizontally and rotatably just below the mounting plate 22. The pressure block 6 is cylindrical, and the axis of the pressure block 6 is parallel to the upper surface of the workbench 2, with a parallelism tolerance of 0.2mm. The circumference of the pressure block 6 is evenly distributed. There are four rows of vacuum suction cups 7, which are all made of nitrile rubber. There are seven vacuum suction cups 7 in each row, and the vacuum suction cups 7 in each row are evenly arranged along the axis of the pressing block 6. Four empty slots are provided in the center of the pressing block 6, which are respectively connected to the four rows of vacuum suction cups 7. One end of the pressing block 6 is provided with a rotary joint 23 along the axis of the pressing block 6. The model of the rotary joint 23 is MQR4-S24. The rotary joint 23 is a four-input and four-output rotary joint 23. The four air outlets are respectively connected to the four rows of vacuum suction cups 7. The ports of the vacuum suction cups 7 are made of soft rubber. When the vacuum suction cup 7 is located at the lowest end of the pressing block 6, it is 0.5 mm higher than the bottom surface of the electric heating plate 5. The four air inlets are respectively connected to the external vacuum generator. A motor 10 is provided at one section of the pressing block 6. The motor 10 adopts a stepping motor. The motor 10 is fixedly mounted on the mounting plate 22, and the output end is fixedly connected to the axis of the pressing block 6 with a coupling.

[0039] An electric heating plate 5 is also fixedly installed below the mounting plate 22. The heating range of the electric heating plate 5 is 80°C-170°C. The electric heating plate 5 and the pressing block 6 are connected to the mounting plate 22 together. The relative position remains unchanged, and the pressing block 6 is located behind the electric heating plate 5 based on the forward direction of the driving device 4 (that is, the driving device drives the LCD screen to pass through the electric heating plate 5 first and then through the pressing block 6). The electric heating plate 5 is made of stainless steel. The bottom of the electric heating plate 5 is a complete plane. The working surface of the electric heating plate 5 faces downward, and the surface roughness of the working surface is Ra1.6. When each vacuum suction cup 7 rotates to the bottom of the pressing block 6, the bottom of each vacuum suction cup 7 is flush with the bottom of the electric heating plate 5. A collecting tank 14 is also provided above the electric heating plate 5. Seven levers 13 are provided inside the collecting tank 14. Each lever 13 is made of steel. The thickness of each lever 13 is 3 mm. The seven levers 13 are evenly arranged along the axis of the pressing block 6, and each lever 13 is staggered with the vacuum suction cup 7. Each lever 13 is tilted upward against the direction of rotation of the pressing block 6, with an inclination angle of 40°, and is tangent to the surface of the pressing block 6.

[0040] A pressing plate 11 is also fixedly installed below the mounting plate 22. The pressing plate 11 is located behind the pressing block 6. The pressing plate 11 is made of 304 stainless steel. The bottom surface roughness of the pressing plate 11 is Ra0.6. The bottom surface of the pressing plate 11 is flush with the bottom surface of the electric heating plate 5. A protrusion 12 is horizontally welded to the front end of the pressing plate 11. The protrusion 12 is triangular. The tip of the protrusion 12 is horizontally facing the direction of the pressing plate 11. The angle of the tip is 30° and it is tilted upward in the direction away from the pressing block 6. The bottom of the protrusion 12 is flush with the bottom of the pressing plate 11 and the roughness is also Ra0.6. A storage box 15 is fixedly installed on the top of the pressing plate 11. The storage box 15 is filled with 60% alcohol. The storage box 1 5 is rotatably installed directly below a sponge roller 16, the density of the sponge roller 16 is 80H, a connecting pipe 17 with a diameter of 1mm is opened between the sponge roller 16 and the storage box 15, the connecting pipe 17 is located in the middle of the sponge roller 16, the lowest point of the sponge roller 16 is 1mm lower than the bottom of the pressure plate 11, the bottom of the pressure plate 11 is provided with a groove at a distance of 1610mm from the sponge roller, a scraper 18 is provided every 5mm inside the groove, a total of four scrapers 18 are provided, the scrapers 18 are all semicircular sealing silicone strips with a diameter of 3mm, the arc of the semicircular scrapers 18 is downward, and the lowest point of each scraper 18 is 0.5mm lower than the bottom of the pressure plate 11.

[0041] The specific workflow is as follows:

[0042] In the initial state, one of the rows of vacuum suction cups 7 on the pressing block 6 is located directly below the pressing block 6. Place the groove on the workbench 2 corresponding to the LCD screen on the workbench 2, and the fixing device 3 on the workbench 2 firmly adsorbs the bottom of the LCD screen on the workbench 2 by vacuum adsorption. Then the driving device 1 4 drives the workbench 2 to move forward until the LCD screen on the workbench 2 is aligned with the electric heating plate 5. The electric heating plate 5 is kept stable at 100°C. Driven by the driving device 2 8, the electric heating plate 5 moves downward at a speed of 0.05m / s. When the electric heating plate 5 drops to a position 210mm away from the workbench, the speed of the driving device 2 8 is changed to 0.01m / min and moves downward. When the electric heating plate 5 contacts the surface of the LCD screen, the pressure sensor will be squeezed upward by the mounting plate 22. When the pressure is detected to reach 0.3N, the driving device 2 8 stops driving the electric heating plate 5 downward and maintains the position unchanged. Then the electric heating plate 5 remains in contact with the surface of the LCD screen for 1min, and then the driving device 1 4 starts to drive the heated LCD screen to move forward at a constant speed of 0.6m / min, and then all the vacuum suction cups 7 start to pump air. The row of vacuum suction cups 7 located directly below the pressure block 6 is constantly pumping air. When the surface of the LCD screen passes through the row of vacuum suction cups 7, the row of vacuum suction cups 7 is blocked. After detecting the air pressure change of a row of vacuum suction cups 7, the motor 10 starts to drive the pressure block 6 and the vacuum suction cups 7 on the pressure block 6 to rotate in the direction of the LCD screen. After the vacuum suction cups 7 adsorb the polarizer 19 on the surface of the LCD screen, they begin to pull upward, so that the polarizer 19 separates from the screen glass 20 of the LCD screen. The linear speed of the motor 10 is the same as the moving speed of the drive device 4, both of which are 0.6m / min. Every time the pressure block 6 rotates a quarter, the vacuum suction cups 7 in the next row will contact the surface of the LCD screen and continue to adsorb the polarizer 19 on the surface of the LCD screen and rotate and pull it. When the vacuum suction cups 7 in a row drive the polarizer 19 to rotate to the lever 13 in the upper left corner, the lever 13 will peel off the polarizer 19 adsorbed by the vacuum suction cups 7 in that row from the vacuum suction cups 7 in that row and guide it into the collection tank 14. When the vacuum suction cups 7 in each row no longer adsorb the polarizer 19, that is, when the air pressure at the vacuum suction cups 7 in each row returns to its initial state, it is determined that the polarizer 19 has been removed, and the external vacuum generator stops vacuuming the vacuum suction cups 7 in each row.

[0043] When the polarizer 19 adsorbed by the vacuum suction cup 7 falls off during the rotation of the pressing block 6, the tip of the protrusion 12 will be inserted into the gap between the polarizer 19 and the screen glass 20, and as the LCD screen continues to move horizontally, the polarizer 19 and the screen glass 20 will be separated and wait for the subsequent vacuum suction cup 7 to re-adsorb and pull it into the collection tank 14.

[0044] The screen glass 20 of the LCD screen with the polarizer 19 pulled off will enter horizontally just below the pressure plate 11. After entering below the pressure plate 11, it will first pass through the sponge roller 16. The screen glass 20 will drive the sponge roller 16 to rotate and squeeze the sponge roller 16. Since the sponge stick is connected to the storage box 15 above, the alcohol inside the storage box 15 will fall onto the sponge roller 16 and spread to the entire sponge roller 16 under the capillary action of the sponge roller 16. It will also drive the sponge roller 16 with the screen glass 20. The alcohol on the sponge roller 16 will be smeared on the screen glass 20 as the screen glass 20 passes by, and the alcohol can dissolve the residual UV glue on the screen glass 20. Then, the screen glass 20 begins to pass through the scraping bar 18, and the scraping bar 18 scrapes the alcohol and UV glue on the screen glass 20 off the screen. When the screen glass 20 completely leaves the pressure plate 11, the polarizer 19 on the screen glass 20 has been removed and the UV glue has also been cleaned. At this point, the entire polarizer 19 scraping process is completed.

[0045] It is only necessary to remove the screen from the fixing device 3 and reinstall a liquid crystal screen without removing the polarizer 19 on the workbench 2, and repeat the above steps to achieve continuous production.

[0046] In this embodiment, the device can only clean one piece at a time. After cleaning, the LCD screen needs to be removed and a new LCD screen needs to be reinstalled before continuing cleaning. It is suitable for small batch production.

[0047] Example 2:

[0048] Reference 1 to Figure 5 ,as well as Figure 7, which differs from Example 1 in that: the drive device 1 4 is an annular conveyor belt (described below), on which multiple workbenches 2 are fixedly mounted. The interval between each workbench 2 is 300mm, and the temperature of the electric heating plate 5 is also 100°C. To ensure that each LCD screen can be fully heated, the speed of the annular conveyor belt is 0.6m / min, and each workbench 2 passes under the electric heating plate 5, the pressing block 6, and the pressing plate 11. The fixing device 3 is a groove on the workbench 2 with the same size as the LCD screen. There is no vacuum pumping function inside the groove. The front end of the electric heating plate 5 is provided with an inclined guide slope, which slopes downward in the direction of the annular conveyor belt. After the control drive device 2 8 is lowered to the set height, the annular conveyor belt is started. Only one person is required to continuously place the screen into the groove of the workbench 2. When the LCD screen passes through the electric heating plate 5, it is fixed by the electric heating plate 5 and the groove on the workbench 2, so that it will not move, and will not cause any impact when removing the polarizer 19. As each workbench 2 carries the LCD screens through the electric heating plate 5, the pressing block 6, and the pressing plate 11, it removes the polarizer 19 from the LCD screens, as in Example 1. When unloading, the screen glass 20, with the polarizer 19 removed, is removed from the other side of the workbench 2. Compared to Example 1, the use of an endless conveyor belt as the drive device 4 enables continuous production, making it suitable for removing polarizers 19 from LCD screens in large quantities.

[0049] At the same time, if the speed of the endless conveyor belt needs to be increased, the temperature of the electric heating plate 5 needs to be increased so that the electric heating plate 5 can heat the liquid crystal screen to the temperature at which the UV glue softens in a shorter time.

[0050] Functions and implementation processes not described in this embodiment are the same as those in the first embodiment, so they will not be described in detail.

[0051] The above two embodiments are merely examples among the many embodiments of the present invention. Various changes are possible without violating the principles of the present invention. The embodiments produced by those skilled in the art who modify the present invention without creative work also fall within the scope of protection of the present invention.

Claims

1. A display polarizer thermal cleaning system, comprising: Rack (1); A workbench (2), wherein a workbench (2) for carrying a liquid crystal screen is horizontally arranged on the frame (1), a fixing device (3) for fixing the liquid crystal screen is arranged on the surface of the workbench (2), a driving device (4) for driving the workbench (2) to move horizontally is arranged at the bottom of the workbench (2), and an electric heating plate (5) for heating the liquid crystal screen is arranged on the upper side of the workbench (2); The invention is characterized in that: the frame (1) is further provided with a vacuum adsorption part, and the frame (1) is further provided with a detection device (9) for detecting the distance between the vacuum adsorption part and the surface of the liquid crystal screen. After the electric heating plate (5) heats the liquid crystal screen, the vacuum adsorption part closely adsorbs the polarizer (19) on the surface of the liquid crystal screen. After the vacuum adsorption part adsorbs the polarizer (19), it rotates along the moving direction of the driving device (4) and pulls the polarizer (19) off the liquid crystal screen. The linear speed of the vacuum adsorption part during rotation is the same as the linear speed of the driving device (4). The vacuum adsorption part includes a cylindrical pressing block (6) horizontally arranged above the workbench (2), the axis of the cylindrical pressing block (6) is parallel to the upper surface of the workbench (2), and the parallelism tolerance is less than or equal to 0.2 mm. The frame (1) is also provided with a second driving device (8), and the second driving device (8) can drive the pressing block (6) to move linearly up and down. A plurality of vacuum suction cups (7) are fixedly installed on the pressing block (6), and the plurality of vacuum suction cups (7) are arranged in a plurality of rows along the axis direction of the pressing block (6). The plurality of rows of vacuum suction cups (7) are evenly distributed on the surface of the pressing block (6). A motor (10) is horizontally arranged on the pressing block (6), and the output end of the motor (10) is fixedly connected to the end face of the pressing block (6) and drives the pressing block (6) to rotate. The electric heating plate (5) is fixedly connected to the output end of the second driving device (8); the pressure block (6) is rotatably mounted behind the electric heating plate (5); and the position between the pressure block (6) and the electric heating plate (5) remains relatively fixed; the end face of each vacuum suction cup (7) is made of soft rubber; when each vacuum suction cup (7) is rotated to a position directly below the pressure block (6), the lowest point of the vacuum suction cup (7) is 0.5 mm higher than the bottom of the electric heating plate (5); and the detection device (9) is a pressure sensor fixedly mounted between the heating plate and the output end of the driving device.

2. The display polarizer thermal cleaning system according to claim 1, characterized in that: A pressing plate (11) is also fixedly mounted on the electric heating plate (5). The pressing plate (11) is made of metal or plastic. When the pressing plate (11) is made of metal, the bottom surface roughness of the pressing plate (11) is lower than Ra0.

6. The pressing plate (11) is located behind the pressing block (6). The pressing plate (11) cooperates with the electric heating plate (5) to sandwich the pressing block (6). The bottom of the pressing plate (11) is flush with the bottom of the electric heating plate (5).

3. The display polarizer thermal cleaning system according to claim 2, characterized in that: A protrusion (12) is fixedly mounted on the lower side of the pressing plate (11), the cross section of the protrusion (12) is triangular, the bottom of the protrusion (12) is flush with the pressing plate (11), the tip of the triangular protrusion (12) is horizontally oriented toward the pressing block (6), and the angle of the tip of the protrusion (12) is less than 30°.

4. The display polarizer thermal cleaning system according to claim 2, wherein: A plurality of levers (13) are provided on the upper side of the electric heating plate (5), each of the levers (13) is tangent to the pressing block (6), and the plurality of levers (13) are evenly arranged along the axial direction of the pressing block (6). The plurality of levers (13) correspond to the gaps between the plurality of vacuum suction cups (7) in each row, and are respectively inserted into the gaps between the corresponding vacuum suction cups (7) in the direction opposite to the rotation direction of the pressing block (6). The distance between the end point of the non-fixed end of the lever (13) and the tangent point between the lever (13) and the pressing block (6) is less than the height of one vacuum suction cup (7).

5. The display polarizer thermal cleaning system according to claim 4, characterized in that: A collecting trough (14) is fixedly mounted on the upper side of the heating plate, the opening of the side wall of the collecting trough (14) faces the direction of the pressing block (6), the bottom of the shifting rod (13) is fixed to the front end of the opening of the collecting trough (14), the shifting rod (13) is made of steel, the thickness of the shifting rod (13) is not less than 3 mm, the shifting rod (13) is inclined upward from the inside of the collecting trough (14) toward the pressing block (6) and is tangent to the pressing block (6), and the inclination angle of the shifting rod is greater than 30° and less than 60°.

6. The display polarizer thermal cleaning system according to claim 2, wherein: A storage box (15) for storing alcohol is provided on one side of the pressing plate (11) close to the pressing block (6); a sponge roller (16) is horizontally rotatably installed at the bottom of the pressing plate (11); a connecting pipe (17) is provided between the sponge roller (16) and the storage box (15) for allowing alcohol to drip onto the surface of the sponge roller (16); the size of the connecting pipe (17) is between 1 and 1.5 mm; and a plurality of scraping strips (18) are also provided at the bottom of the pressing plate (11).

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