A touch screen attaching apparatus and attaching method

Abstract

This invention discloses a touchscreen bonding device and method, belonging to the field of touchscreen manufacturing technology. The device includes a vacuum chamber, a door, an alignment plate, and a positioning bonding mechanism. The vacuum chamber has an inlet / outlet at one end and a push-pull mechanism on its outer wall. The door has a bonding platform for adsorbing and supporting the substrate; the door is configured to be driven by the push-pull mechanism to move the bonding platform relative to the vacuum chamber through the inlet / outlet. The alignment plate is configured corresponding to the bonding platform and is used to adsorb and support the touchscreen cover plate. The alignment plate rises and falls relative to the bonding platform to move the touchscreen cover plate towards the substrate. The positioning bonding mechanism is located on the door and above the bonding platform, and is used for pre-bonding and positioning of the touchscreen cover plate and substrate, removing air bubbles during vacuum bonding, and pressing and positioning. Specifically, this invention provides a touchscreen bonding device and method that can guarantee the quality of touchscreen bonding.

Description

Technical Field

[0001] This invention belongs to the field of touch screen manufacturing technology, specifically referring to a touch screen bonding device and bonding method. Background Technology

[0002] With the widespread application of touch screens in electronic devices such as automobiles, mobile phones, and tablets, the market has placed higher demands on the bonding accuracy, bonding quality, and production efficiency of touch screens. In particular, the requirements for touch sensitivity, touch positioning accuracy, and display effect after bonding are becoming increasingly stringent. Bonding quality directly determines the touch performance and lifespan of the touch screen and is one of the core factors affecting product competitiveness.

[0003] In existing touchscreen bonding technologies, considering that the area outside the vacuum chamber is an open workstation with ample space and no obstructions, high-precision visual positioning components can be flexibly arranged. This facilitates adjustment of the camera's optical path, expands the field of view, avoids interference from the vacuum environment on visual imaging, and also facilitates maintenance and parameter adjustment of the alignment mechanism, effectively improving alignment accuracy and production efficiency. Typically, the alignment of the touchscreen cover and substrate is completed outside the vacuum chamber, and the aligned cover and substrate are then transferred into the vacuum chamber for bonding. However, the lack of effective positioning constraints during the transfer process makes it easy for the cover and substrate to shift relative to each other, which can reduce alignment accuracy and lead to touch signal drift and inconsistent touch response.

[0004] Furthermore, during vacuum bonding, the defoaming and pressing actions lack precise coordination. Traditional technologies often employ simultaneous vacuum pressing with pressure rollers or a method of vacuuming first and then pressing. The former easily leads to air bubbles on the bonding surface being trapped inside the adhesive layer and unable to escape, forming residual air bubbles that affect display quality and cause uneven touch sensitivity and capacitance fluctuations. The latter, on the other hand, is prone to uneven force on the bonding surface due to improper pressing timing, resulting in problems such as loose edge bonding and delamination. This not only shortens the lifespan of the touchscreen but also causes localized touch malfunctions, further reducing product yield. Summary of the Invention In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a touch screen bonding device and bonding method to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted by this invention is as follows: This invention proposes a touchscreen bonding device, comprising: A vacuum chamber has an inlet and outlet at one end and a push-pull mechanism on its outer wall. The vacuum chamber is connected to a vacuum pump group for graded control of the vacuum environment. The vacuum pump group includes a main vacuum pump and an auxiliary vacuum pump. The door is sealed and adapted to the inlet and outlet of the vacuum chamber, and a bonding platform is provided on it for adsorbing and carrying the substrate. The door is configured to be driven by a push-pull mechanism to move the bonding platform relative to the vacuum chamber through the inlet and outlet. Alignment plate, configured to correspond to bonding stage, is used to adsorb and support touch screen cover plate. The alignment plate is raised and lowered relative to bonding stage to drive touch screen cover plate to move towards substrate, thereby completing the alignment and pre-bonding of touch screen cover plate and substrate. The positioning and bonding mechanism is located on the door of the box and above the bonding table. It is used for pre-bonding and positioning of the touch screen cover and substrate, removing air bubbles by roller pressing during vacuum bonding, and pressing and positioning. The positioning and bonding mechanism includes multiple sets of mounting plates with adjustable spacing. Each set of mounting plates is equipped with a set of oil-free vacuum cylinders below it. The free end of the oil-free vacuum cylinder is equipped with a roller frame, and a pressure roller is rotatably mounted on the roller frame.

[0006] Furthermore, the door and the vacuum chamber are located close to each other on one side, one of which is provided with a sealing groove and the other with a sealing strip.

[0007] Furthermore, casters are provided below the door.

[0008] Furthermore, the bonding platform and the alignment plate are respectively provided with a substrate contouring groove and a cover plate contouring groove. Both the substrate contouring groove and the cover plate contouring groove are provided with multiple sets of adsorption holes. Both the bonding platform and the alignment plate are provided with adsorption cavities, and the adsorption cavities are connected to the adsorption holes. An adsorption through hole is provided through the bottom wall of the adsorption cavity of the bonding platform. A substrate adsorption mechanism is provided on the outside of the vacuum box, which provides negative pressure adsorption force to the bonding platform through the adsorption through hole. The adsorption cavity of the alignment plate is connected to a first negative pressure pump through a telescopic corrugated pipe.

[0009] Furthermore, the substrate adsorption mechanism includes a telescopic cylinder, an adsorption air supply plate, and a second negative pressure pump. The adsorption air supply plate is located at the free end of the telescopic cylinder. The adsorption air supply plate has an air supply chamber inside and an air supply groove on its top wall. The air supply groove communicates with the air supply chamber. The air supply groove corresponds one-to-one with the adsorption through hole, and the diameter of the air supply groove is smaller than the diameter of the adsorption through hole. The second negative pressure pump is connected to the air supply chamber through a telescopic corrugated pipe.

[0010] Furthermore, one of the bottom wall of the bonding platform and the top wall of the adsorption air supply plate is provided with a sealing groove, and the other is provided with a sealing strip. Both the sealing groove and the sealing strip are located on the outside of the air supply groove and the adsorption through hole.

[0011] Furthermore, the push-pull mechanism includes a push-pull motor and two sets of symmetrically arranged push-pull assemblies. Each push-pull assembly includes a bearing seat, a push-pull screw, and a push-pull plate. The bearing seat is located on the outer wall of the vacuum chamber, and the push-pull screw is rotatably mounted on the bearing seat. The push-pull plate is threadedly connected to the push-pull screw, and the two sets of push-pull plates are respectively connected to both sides of the chamber door. The push-pull motor is located on the outer wall of the vacuum chamber, and one set of push-pull screws is connected to the output shaft of the push-pull motor. The two sets of push-pull screws rotate synchronously.

[0012] Furthermore, the positioning and bonding mechanism includes a support, a spacing adjustment screw, and a spacing adjustment slide. The support is located at one end of the bonding platform near the vacuum chamber. The spacing adjustment screw is rotatably positioned between the chamber door and the support. The spacing adjustment slide is located between the chamber door and the support and is parallel to the spacing adjustment screw. A spacing adjustment motor is located on the outside of the chamber door. One end of the spacing adjustment screw is connected to the output shaft of the spacing adjustment motor. A positioning plate is located on the chamber door. The positioning plate and multiple sets of mounting plates are hinged together by a scissor linkage. One end of a set of mounting plates away from the positioning plate is connected to the spacing adjustment screw by a thread, and the other end is slidably positioned on the spacing adjustment slide. The other sets of mounting plates have sliding holes at positions corresponding to the spacing adjustment screw. The diameter of the sliding holes is larger than the diameter of the spacing adjustment screw and is slidably positioned on the spacing adjustment slide.

[0013] Furthermore, the spacing adjustment slide rod is provided in at least two sets. Except for one set of mounting plates connected to the spacing adjustment screw, the two ends of the other sets of mounting plates are slidably disposed on the two sets of spacing adjustment slide rods.

[0014] Furthermore, when the positioning and bonding mechanism is not extended, the positioning and bonding mechanism is located at the end of the bonding table away from the vacuum box and does not obstruct the substrate contour groove.

[0015] Furthermore, a lifting drive mechanism is provided outside the vacuum chamber. The lifting drive mechanism includes two sets of symmetrically arranged lifting components and a top plate. The lifting components include a lifting motor, a support column, a lifting screw, and a lifting plate. The top plate is located at the upper end of the two sets of support columns. The lifting motor is located on the top plate. The lifting screw is rotatably located on the top plate and connected to the output shaft of the lifting motor. The lifting plate is connected to the lifting screw by a thread and is slidably located on the support column. The alignment plate is located on the lifting plate.

[0016] Furthermore, each of the two sets of lifting plates has a rotating shaft on one side of its opposite side. Both ends of the alignment plate are connected to the two sets of rotating shafts. One set of the lifting plates is equipped with a rotating motor. The output shaft of the rotating motor is parallel to the axis of the rotating shaft but not coaxial. The output shaft of the rotating motor is connected to the rotating shaft by a belt or chain drive. The rotating shaft on the lifting plate is a hollow shaft. One end of the telescopic corrugated tube is rotatably connected to the hollow rotating shaft, and the end of the telescopic corrugated tube connected to the hollow rotating shaft is a rigid tube.

[0017] The present invention also provides a bonding method for a dedicated bonding device for touch screens, specifically including the following steps: (1) Equipment initialization preparation Power on the equipment and the controller completes the system self-test (including the status calibration of each motor, cylinder, sensor and vacuum system); the positioning and bonding mechanism maintains the preset initial state, does not block the substrate contouring groove, and reserves operating space for subsequent feeding and alignment; the controller controls the push-pull mechanism to drive the box door to move the bonding table out of the vacuum box until the bonding table is completely moved out of the vacuum box inlet and outlet. (2) Substrate placement and adsorption fixation Place the touch screen substrate with pre-applied OCA adhesive into the substrate contour groove of the bonding table, activate the substrate adsorption mechanism, and the telescopic cylinder drives the adsorption air supply plate to rise, so that the air supply groove corresponds one-to-one with the adsorption through holes of the bonding table, and the double sealing structure between the adsorption air supply plate and the bonding table is properly bonded; activate the second negative pressure pump, and form a negative pressure adsorption circuit through the air supply chamber, adsorption through holes, adsorption chamber and adsorption holes to stably adsorb and position the substrate in the substrate contour groove to prevent displacement during subsequent operations, and remove the protective film on the surface of the pre-applied OCA adhesive. (3) Placement, flipping and alignment calibration of touch screen cover The rotating motor of the lifting drive mechanism is started, which drives the rotating shaft to rotate, thereby driving the alignment plate to flip up so that the cover plate contour groove faces upward. The touch screen cover plate that matches the substrate is placed in the cover plate contour groove of the alignment plate. The first negative pressure pump is started, and the cover plate is adsorbed and fixed through the adsorption chamber and adsorption holes. The rotating motor is activated again, driving the alignment plate to flip up so that the cover plate contour groove faces downward, so that the cover plate is vertically aligned with the substrate on the bonding table. (4) Pre-alignment and bonding Start the lifting motor to drive the lifting plate and slowly lower the alignment plate, so that the touch screen cover is close to the substrate until the cover and the pre-applied adhesive layer of the substrate make slight contact (contact pressure ≤0.02MPa); at this time, the controller cuts off the suction effect of the first negative pressure pump on the cover, and the cover is accurately covered on the substrate under its own weight and the initial adhesion of the adhesive layer, realizing the pre-alignment and bonding of the touch screen cover and the substrate; (5) Pre-bonding positioning and vacuum box transfer After pre-bonding is completed, the spacing adjustment motor of the positioning and bonding mechanism is started, driving the spacing adjustment screw to rotate. Since the set of mounting plates furthest from the positioning plate is threadedly connected to the spacing adjustment screw, and the remaining sets of mounting plates have sliding holes (the diameter of the sliding holes is larger than the diameter of the spacing adjustment screw) at corresponding positions on the spacing adjustment screw and are slidably mounted on the spacing adjustment slide rod, when the spacing adjustment screw rotates, it only drives the set of mounting plates furthest from the positioning plate to slide along the spacing adjustment slide rod. This set of mounting plates drives the remaining sets of mounting plates to move synchronously via a scissor linkage until the spacing between the sets of mounting plates is adjusted to the preset position suitable for the touchscreen, ensuring that the multiple pressure rollers can evenly cover the top of the touchscreen cover. Then, the multiple sets of oil-free vacuum cylinders of the positioning and bonding mechanism are controlled to... As the vacuum chamber extends, a pressure sensor monitors the output pressure in real time. When the pressure reaches 0.03~0.05MPa, the oil-free vacuum cylinder stops extending, and multiple sets of pressure rollers evenly press onto the top of the touch screen cover, positioning and locking the pre-bonded cover and substrate to ensure accurate alignment and prevent positional shifts when the push-pull mechanism moves the bonding table. This prevents misalignment of the touch area and affects touch accuracy. Subsequently, the servo push-pull motor of the push-pull mechanism is activated, driving two sets of push-pull screws to rotate synchronously through bevel gear transmission. This drives the push-pull plate to move the chamber door and bonding table along the guide rail into the vacuum chamber. When the chamber door moves to completely block the inlet and outlet of the vacuum chamber, the sealing strip of the chamber door embeds into the sealing groove of the vacuum chamber, achieving vacuum sealing. (6) Staged vacuum pumping and roller defoaming First stage (low vacuum stage): The controller starts the main vacuum pump of the staged vacuum pump group to evacuate the vacuum chamber to a low vacuum state of 500~1000Pa, maintain this vacuum level for 3~5s, initially remove the free air in the vacuum chamber, and prepare for subsequent defoaming. The vacuum sensor provides real-time feedback of vacuum level data to ensure pressure stability and avoid pressure sudden changes that could damage the touch electrode layer. The second stage (medium vacuum roller defoaming stage): The auxiliary vacuum pump is started to continue to raise the vacuum level in the vacuum chamber to a medium vacuum state of 20~50Pa; the controller controls the oil-free vacuum cylinders except for the first set of oil-free vacuum cylinders to retract synchronously, driving the corresponding pressure rollers to lift off the cover plate surface; then, by the reverse rotation of the spacing adjustment motor, the first set of pressure rollers is driven to move above the touch screen cover plate at a speed of 2~3mm / s. The pressure sensor controls the output pressure of this set of oil-free vacuum cylinders to be maintained at 0.08~0.12MPa. During the movement, the pressure rollers press the touch screen cover plate, squeezing out the air bubbles in the adhesive layer of the bonding surface between the touch screen cover plate and the substrate. The squeezed-out air bubbles are quickly removed through the adsorption holes and adsorption chamber of the bonding table and the air pumping system of the vacuum chamber, achieving efficient defoaming and avoiding the uneven touch sensing and capacitance value fluctuation caused by residual air bubbles, ensuring stable touch sensitivity; The third stage (high vacuum pressure holding stage): The auxiliary vacuum pump continues to work, evacuating the vacuum chamber to an ultimate high vacuum state of ≤10Pa; the controller controls all oil-free vacuum cylinders to extend synchronously, and multiple sets of pressure rollers press on the top of the touch screen cover plate, maintaining the pressure at 0.05~0.1MPa. All pressure rollers press in a static state for 6~10s to prevent air from entering the bonding surface, ensuring that the cover plate and the substrate are tightly bonded by the adhesive layer, while preventing the extruded air bubbles from seeping back, further ensuring stable touch signal transmission after bonding, and avoiding touch failure or response delay; (7) Depressurization and discharge and finished product handling After the pressure holding is completed, the controller stops the staged vacuum pump group, and the vacuum chamber slowly recovers to atmospheric pressure within 5-10 seconds to avoid pressure shock that could deform the touch screen, prevent damage to the touch electrode layer or displacement of the touch area, and affect touch performance. After the pressure inside the vacuum chamber returns to atmospheric pressure, the push-pull mechanism activates, driving the chamber door to move the bonding table out of the vacuum chamber. The controller then disconnects the negative pressure adsorption of the substrate adsorption mechanism, and the operator or automated material handling mechanism removes the bonded touch screen from the substrate contouring groove. The equipment is then reset to prepare for the next bonding process.

[0018] The technical solution provided by this invention has the following beneficial effects: (1) The pre-pressed cover plate and substrate are pre-locked outside the vacuum box by the positioning and bonding mechanism to form a mechanical constraint, so as to avoid the relative displacement of the cover plate and substrate during the process of the push-pull mechanism moving the bonding table into the box, ensuring the accuracy of the touch area alignment and solving the problems of touch signal drift and inconsistent response; (2) The positioning and bonding mechanism works in conjunction with the graded vacuum control of the vacuum box. In the medium vacuum stage, it switches to the single-roller moving roller pressing mode to actively expel air bubbles. In the high vacuum stage, it switches to the multi-roller static pressing mode to prevent air bubbles from seeping back. This achieves precise coordination between defoaming and pressing actions, completely solving the defects of air bubble residue and uneven force in traditional pressing methods, avoiding uneven touch sensing and local touch failure, and ensuring the touch sensitivity and consistency of the touch screen after bonding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a touchscreen bonding device and bonding method proposed in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a touchscreen bonding device and bonding method proposed in an embodiment of the present invention. Figure 2 ; Figure 3 This is a three-dimensional cross-sectional view of a touch screen bonding device and bonding method according to an embodiment of the present invention. Figure 4This is a schematic diagram of the positioning and bonding mechanism of a touch screen bonding device and bonding method according to an embodiment of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the alignment plate of a touch screen bonding device and bonding method according to an embodiment of the present invention. Figure 6 This is a three-dimensional cross-sectional view of the bonding table and substrate adsorption mechanism of a touch screen bonding device and bonding method according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the driving structure of the positioning and bonding mechanism of a touch screen bonding device and bonding method according to an embodiment of the present invention.

[0020] The components include: 1. Vacuum box; 2. Inlet / outlet; 3. Push-pull mechanism; 4. Box door; 5. Lamination table; 6. Alignment plate; 7. Mounting plate; 8. Oil-free vacuum cylinder; 9. Roller frame; 10. Pressure roller; 11. Sealing groove; 12. Sealing strip; 13. Moving wheel; 14. Substrate contouring groove; 15. Cover plate contouring groove; 16. Adsorption hole; 17. Adsorption chamber; 18. Adsorption through hole; 19. Telescopic cylinder; 20. Adsorption air supply plate; 21. Second negative pressure pump; 22. Air supply chamber; 23. Air supply groove. 4. Push-pull motor; 25. Bearing housing; 26. Push-pull screw; 27. Push-pull plate; 28. Support; 29. ​​Spacing adjustment screw; 30. Spacing adjustment slide bar; 31. Spacing adjustment motor; 32. Positioning plate; 33. Scissor lift linkage; 34. Top plate; 35. Lifting motor; 36. Support column; 37. Lifting screw; 38. Lifting plate; 39. Load-bearing column; 40. Telescopic corrugated pipe; 41. First negative pressure pump; 42. Drive shaft; 43. Bevel transmission gear; 44. Bevel drive gear.

[0021] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0022] The technical solutions in 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0023] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0024] See Figures 1-4 and Figure 7In this embodiment, the present invention provides a touch screen bonding device, including a vacuum chamber 1, a chamber door 4, an alignment plate 6, and a positioning bonding mechanism. The vacuum chamber 1 has an inlet / outlet 2 at one end, and a push-pull mechanism 3 on its outer wall. A vacuum pump group is connected to the vacuum chamber 1 to achieve graded control of the vacuum environment. The vacuum pump group includes a main vacuum pump and an auxiliary vacuum pump. The vacuum pump group and the graded control logic for the vacuum environment are both existing mature technologies. Vacuum parameters can be preset according to the bonding process requirements. A vacuum sensor is installed inside the vacuum chamber 1. The core purpose of graded vacuum control is to cooperate with subsequent roller pressing and defoaming to avoid abnormal touch signals caused by residual bubbles, and to prevent sudden changes in vacuum pressure from damaging the substrate. The touch electrode layer is located on the upper part of the vacuum chamber 1. The door 4 is sealed and adapted to the inlet / outlet 2 of the vacuum chamber 1, and a bonding platform 5 is provided on it for adsorbing and supporting the substrate. The door 4 is configured to be driven by the push-pull mechanism 3 to move the bonding platform 5 relative to the vacuum chamber 1 through the inlet / outlet 2. When the door 4 moves the bonding platform 5 out of the vacuum chamber 1, it facilitates the picking, placing and aligning of the substrate. When the door 4 moves the bonding platform 5 into the vacuum chamber 1, it cooperates with the graded vacuum environment inside the vacuum chamber 1 to achieve the bonding of the touch screen cover and the substrate, ensuring that the touch electrodes and the sensing area of ​​the cover are accurately aligned after bonding, and ensuring stable touch performance. The alignment plate 6 is configured to correspond to the bonding platform 5 and is used to adsorb and support the touch screen cover. The alignment plate 6 moves up and down relative to the bonding table 5 to move the touch screen cover towards the substrate, completing the pre-alignment and bonding of the touch screen cover and the substrate. In use, the touch screen cover is first placed on the alignment plate 6 and positioned by suction, aligning it with the position of the substrate on the bonding table 5. The descent of the alignment plate 6 moves the touch screen cover closer to and into contact with the substrate. At this point, the suction force of the alignment plate 6 on the touch screen cover is released, and the touch screen cover covers the substrate, achieving pre-alignment and bonding of the touch screen cover and the substrate. This ensures that the sensing area of ​​the cover is completely aligned with the touch electrodes of the substrate, avoiding touch dead zones or accidental touches caused by alignment deviations. The positioning and bonding mechanism is located on the door 4 and on the bonding table 5. This device is used for pre-bonding and positioning of the touchscreen cover and substrate, as well as for de-bubbling and pressing during vacuum bonding. Pre-bonding and positioning prevents positional shifts between the cover and substrate during transport. Precise pressing and de-bubbling ensure the touch sensitivity and consistency of the touchscreen after bonding, preventing touch failure caused by bubbles or uneven pressing. The positioning and bonding mechanism includes multiple sets of adjustable mounting plates 7. Each set of mounting plates 7 has an oil-free vacuum cylinder 8 below it. The free end of the oil-free vacuum cylinder 8 is equipped with a roller frame 9. A pressure roller 10 is rotatably mounted on the roller frame 9. The pressure roller 10 is made of silicone with a Shore hardness of 40-50HA, which ensures the pressing effect while preventing scratches on the touchscreen cover.

[0025] It should be noted that a drive source and controller are installed on the outside of the door 4. The drive source provides power to the oil-free vacuum cylinder 8. The connecting air pipe between the drive source and the oil-free vacuum cylinder 8 is existing technology and is not shown in the figure. The oil-free vacuum cylinder 8 is electrically connected to the controller to realize the independent control of multiple sets of oil-free vacuum cylinders 8, and precisely adjust the pressure of the pressure roller 10 in the corresponding area to ensure that the force on the touch electrode area is uniform, avoiding excessive pressure that may damage the touch electrode, and insufficient pressure that may result in poor adhesion and affect the touch signal.

[0026] In addition, a pressure sensor is installed at the air inlet of the oil-free vacuum cylinder 8. The pressure sensor is electrically connected to the controller and can monitor the output pressure of the oil-free vacuum cylinder 8 in real time, thereby accurately controlling its extension degree. This ensures that the pressing pressure of the pressure roller 10 on the touch screen cover is stable and controllable, avoiding product defects caused by excessive or insufficient pressure. In particular, it prevents excessive pressure from damaging the touch electrodes and insufficient pressure from causing air bubbles to remain, which can lead to problems such as decreased touch sensitivity and touch drift.

[0027] In this embodiment, each drive power source is located outside the vacuum chamber 1 to ensure stable and safe operation of the equipment.

[0028] See Figures 1-3 In this embodiment, the door 4 and the vacuum chamber 1 are close to each other on one side. One of them is provided with a sealing groove 11, and the other is provided with a sealing strip 12. When the door 4 moves to block the inlet / outlet 2 of the vacuum chamber 1, the sealing strip 12 is precisely embedded in the sealing groove 11, ensuring the sealing between the door 4 and the vacuum chamber 1, ensuring the stability of the graded vacuum environment, and providing a guarantee for the stable bonding effect of the touch performance. This avoids air entering due to poor sealing, which could generate bubbles and affect the touch sensing. The bottom of the door 4 is provided with a moving wheel 13. The moving wheel 13 supports the door 4 and, together with the push-pull mechanism 3, ensures the stability of the door 4's position movement drive.

[0029] See Figures 5-6 In this embodiment, the bonding platform 5 and the alignment plate 6 are respectively provided with a substrate contouring groove 14 and a cover plate contouring groove 15. Both the substrate contouring groove 14 and the cover plate contouring groove 15 are provided with multiple sets of adsorption holes 16. Both the bonding platform 5 and the alignment plate 6 are provided with adsorption cavities 17, which are connected to the adsorption holes 16. An adsorption through hole 18 is provided through the bottom wall of the adsorption cavity 17 of the bonding platform 5. A substrate adsorption mechanism is provided on the outside of the vacuum box 1. The adsorption through hole 18 provides a negative pressure adsorption force to the bonding platform 5, ensuring that the substrate can be stably adsorbed and positioned in the substrate contouring groove 14. The adsorption cavity 17 of the alignment plate 6 is connected to a first negative pressure pump 41 through a telescopic corrugated pipe 40. The first negative pressure pump 41 provides a negative pressure adsorption force to the alignment plate 6, ensuring that the touch screen cover can be stably adsorbed and positioned in the cover plate contouring groove 15.

[0030] See Figure 2 and Figure 6 In this embodiment, the substrate adsorption mechanism includes a telescopic cylinder 19, an adsorption air supply plate 20, and a second negative pressure pump 21. The adsorption air supply plate 20 is located at the free end of the telescopic cylinder 19. An air supply chamber 22 is provided inside the adsorption air supply plate 20, and an air supply groove 23 is provided on the top wall of the adsorption air supply plate 20. The air supply groove 23 communicates with the air supply chamber 22, and each air supply groove 23 corresponds to an adsorption through hole 18. The diameter of the air supply groove 23 is smaller than the diameter of the adsorption through hole 18. The second negative pressure pump 21 is connected to the air supply chamber via a telescopic corrugated pipe 40. 22 Connection; When the push-pull mechanism 3 moves the box door 4 and the bonding table 5 completely out of the vacuum box 1, the part of the bonding table 5 with the substrate contour groove 14 is exactly above the adsorption air supply plate 20. The adsorption air supply plate 20 is driven to rise by the telescopic cylinder 19, and the air supply groove 23 corresponds one-to-one with the adsorption through hole 18. Through the action of the second negative pressure pump 21, the substrate is stably placed in the substrate contour groove 14, ensuring that the substrate touch electrode area does not shift, laying the foundation for subsequent alignment bonding and stable touch performance.

[0031] See Figure 6 In this embodiment, one of the bottom wall of the bonding platform 5 and the top wall of the adsorption air supply plate 20 is provided with a sealing groove 11, and the other is provided with a sealing strip 12. The sealing groove 11 and the sealing strip 12 are both located on the outside of the air supply groove 23 and the adsorption through hole 18. With the diameter difference between the air supply groove 23 and the adsorption through hole 18, a double sealing structure is formed to avoid air leakage due to negative pressure suction, ensure the stability of substrate adsorption, and prevent substrate displacement from causing misalignment of the touch screen touch area, thereby affecting touch sensitivity and positioning accuracy.

[0032] See Figure 1 , Figure 2 and Figure 7 In this embodiment, the push-pull mechanism 3 includes a push-pull motor 24 and two sets of symmetrically arranged push-pull components. Each push-pull component includes a bearing seat 25, a push-pull screw 26, and a push-pull plate 27. The bearing seat 25 is located on the outer wall of the vacuum chamber 1. The push-pull screw 26 is rotatably mounted on the bearing seat 25. The push-pull plate 27 is connected to the push-pull screw 26 by a thread. The two sets of push-pull plates 27 are respectively connected to both sides of the chamber door 4. The push-pull motor 24 is located on the outer wall of the vacuum chamber 1. One set of push-pull screws 26 is connected to the output shaft of the push-pull motor 24. The two sets of push-pull screws 26 rotate synchronously.

[0033] As a specific embodiment, in order to ensure that the two sets of push-pull screws 26 rotate synchronously, a transmission shaft 42 is provided between the two sets of push-pull screws 26. The axis of the transmission shaft 42 is perpendicular to the axis of the two sets of push-pull screws 26. Two sets of bevel transmission gears 43 are provided at both ends of the transmission shaft 42. A set of bevel drive gears 44 is provided at the end of the two sets of push-pull screws 26 near the transmission shaft 42, and the two sets of bevel drive gears 44 mesh with the two sets of bevel transmission gears 43 respectively.

[0034] During operation, the push-pull motor 24 is started, which drives a set of push-pull screws 26 connected to it to rotate. The set of push-pull screws 26 drives the conical drive gear 44 on it to rotate. The conical drive gear 44 meshes with a set of conical transmission gears 43 to drive the transmission shaft 42 to rotate. The transmission shaft 42 drives another set of conical transmission gears 43 to rotate. And through the meshing between the other set of conical transmission gears 43 and the conical drive gear 44, it drives another set of push-pull screws 26 to rotate. The two sets of push-pull screws 26 work together to drive the push-pull plate 27 to move. The push-pull plate 27 drives the box door 4 to move relative to the vacuum box 1.

[0035] See Figure 4 In this embodiment, the positioning and bonding mechanism includes a support 28, a spacing adjustment screw 29, and a spacing adjustment slide 30. The support 28 is located at one end of the bonding table 5 near the vacuum chamber 1. The spacing adjustment screw 29 is rotatably positioned between the chamber door 4 and the support 28. The spacing adjustment slide 30 is located between the chamber door 4 and the support 28 and is parallel to the spacing adjustment screw 29. A spacing adjustment motor 31 is provided on the outside of the chamber door 4. One end of the spacing adjustment screw 29 is connected to the output shaft of the spacing adjustment motor 31. A positioning plate 32 is provided on the chamber door 4. The positioning plate 32 and multiple sets of mounting plates 7 are hinged together by a scissor fork linkage 33. One end of a set of mounting plates 7 of the positioning plate 32 is connected to the spacing adjustment screw 29 by a thread, and the other end is slidably mounted on the spacing adjustment slide bar 30. The other sets of mounting plates 7 are provided with sliding holes at the corresponding positions of the spacing adjustment screw 29. The diameter of the sliding holes is larger than the diameter of the spacing adjustment screw 29, and they are slidably mounted on the spacing adjustment slide bar 30. The difference in diameter between the sliding holes and the spacing adjustment screw 29 prevents the spacing adjustment screw 29 from driving the other mounting plates 7 to move. The even distribution of the pressure rollers 10 by adjusting the spacing ensures that the pressure rollers 10 evenly cover the cover plate, avoiding leakage pressure that causes air bubbles to remain, thereby preventing uneven touch sensing and touch failure.

[0036] During operation, the spacing adjustment motor 31 is started, which drives the spacing adjustment screw 29 to rotate. Driven by the spacing adjustment screw 29 and guided by the spacing adjustment slide bar 30, a set of mounting plates 7 away from the positioning plate 32 is moved. This set of mounting plates 7 drives the other sets of mounting plates 7 to move through the scissor linkage 33. The movement of the multiple sets of mounting plates 7 can drive the pressure rollers 10 on them to adjust the spacing, thereby adjusting the position of the pressure rollers 10 above the bonding table 5 so that the position of the pressure rollers 10 matches the pre-bonding positioning and vacuum bonding process of the touch screen cover and substrate. There are at least two sets of spacing adjustment slide bars 30. Except for the set of mounting plates 7 connected to the spacing adjustment screw 29, the two ends of the other sets of mounting plates 7 are slidably mounted on the two sets of spacing adjustment slide bars 30. The two sets of spacing adjustment slide bars 30 ensure the stability of the movement of the mounting plates 7. When the positioning and bonding mechanism is not extended, it is located at the end of the bonding table 5 away from the vacuum box 1 and does not block the substrate contour groove 14, so as to avoid affecting the alignment and bonding of the touch screen cover and the substrate.

[0037] See Figures 1-3 and Figure 7 In this embodiment, a lifting drive mechanism is provided outside the vacuum chamber 1. The lifting drive mechanism includes two sets of symmetrically arranged lifting components and a top plate 34. The lifting components include a lifting motor 35, a support column 36, a lifting screw 37, and a lifting plate 38. The top plate 34 is located at the upper end of the two sets of support columns 36. The lifting motor 35 is located on the top plate 34. The lifting screw 37 is rotatably located on the top plate 34 and connected to the output shaft of the lifting motor 35. The lifting plate 38 is connected to the lifting screw 37 by a thread and is slidably located on the support column 36. The alignment plate 6 is located on the lifting plate 38.

[0038] During operation, the lifting motor 35 is started, which drives the lifting screw 37 to rotate. Driven by the lifting screw 37 and guided by the support column 36, the alignment plate 6 can be lifted and lowered. When the alignment plate 6 descends, it drives the touch screen cover to contact and align with the substrate.

[0039] See Figures 1-2 In this embodiment, each of the two sets of lifting plates 38 has a rotating shaft on one side opposite to the other. The two ends of the alignment plate 6 are connected to the two sets of rotating shafts. A rotating motor is provided on one set of lifting plates 38. The output shaft of the rotating motor is parallel to the axis of the rotating shaft and is not coaxial. The output shaft of the rotating motor is connected to the rotating shaft by a belt or chain. The rotating shaft on one set of lifting plates 38 is a hollow shaft. One end of the telescopic corrugated pipe 40 is rotatably connected to the hollow rotating shaft, and the end of the telescopic corrugated pipe 40 connected to the hollow rotating shaft is a rigid pipe.

[0040] During operation, the rotating motor is started, which drives the rotating shaft on a set of lifting plates 38 to rotate. Driven by the rotating shaft, the alignment plate 6 can be flipped. When the cover plate contour groove 15 of the alignment plate 6 faces upward, it is convenient to place the touch screen cover. When the cover plate contour groove 15 of the alignment plate 6 faces downward, the touch screen cover is aligned with the substrate. Furthermore, during the flipping process of the alignment plate 6, the first negative pressure pump 41 can always provide negative pressure adsorption force to the cover plate contour groove 15 to ensure the positioning accuracy of the touch screen cover.

[0041] It should be noted that the structure of the rotating motor driving the alignment plate 6 to rotate and flip through the rotating shaft is existing technology. Therefore, the rotating motor and rotating shaft are not specifically shown in this embodiment. However, the omission of this structure does not affect the understanding of this solution by those skilled in the art.

[0042] See Figure 2 In this embodiment, the lifting plate 38 includes an upper lifting plate and a lower lifting plate. A load-bearing column 39 is provided between the upper and lower lifting plates. The upper lifting plate is connected to the lifting screw 37 by a thread and is slidably mounted on the support column 36. The alignment plate 6 is rotatably mounted on the lower lifting plate via a rotating shaft. The load-bearing column 39 ensures that the alignment plate 6 drives the cover plate to descend from between the spacing adjustment screw 29 and the spacing adjustment slide bar 30 of the positioning and bonding mechanism to the position where it contacts the substrate on the bonding table 5.

[0043] The present invention also provides a bonding method for a dedicated bonding device for touch screens, specifically including the following steps: (1) Equipment initialization preparation Power on the equipment and the controller completes the system self-test (including the status calibration of each motor, cylinder, sensor and vacuum system); the positioning and bonding mechanism maintains the preset initial state and does not block the substrate contouring groove 14, leaving operating space for subsequent feeding and alignment; the controller controls the push-pull mechanism 3 to move, drive the box door 4 to move the bonding table 5 out of the vacuum box 1 until the bonding table 5 is completely moved out of the inlet and outlet 2 of the vacuum box 1. (2) Substrate placement and adsorption fixation The touch screen substrate with pre-applied OCA adhesive is placed in the substrate contour groove 14 of the bonding table 5. The substrate adsorption mechanism is activated, and the telescopic cylinder 19 drives the adsorption air supply plate 20 to rise, so that the air supply groove 23 corresponds one-to-one with the adsorption through hole 18 of the bonding table 5. The double sealing structure between the adsorption air supply plate 20 and the bonding table 5 is properly bonded. The second negative pressure pump 21 is activated, and a negative pressure adsorption circuit is formed through the air supply chamber 22, the adsorption through hole 18, the adsorption chamber 17 and the adsorption hole 16 to stably adsorb and position the substrate in the substrate contour groove 14 to prevent displacement during subsequent operations. The protective film on the surface of the pre-applied OCA adhesive is then removed. (3) Placement, flipping and alignment calibration of touch screen cover The rotating motor of the lifting drive mechanism is started, which drives the rotating shaft to rotate, thereby driving the alignment plate 6 to flip up so that the cover plate contour groove 15 faces upward. The touch screen cover plate that matches the substrate is placed in the cover plate contour groove 15 of the alignment plate 6. The first negative pressure pump 41 is started, and the cover plate is adsorbed and fixed through the adsorption chamber 17 and adsorption hole 16. The rotating motor is activated again, driving the alignment plate 6 to flip up so that the cover plate contour groove 15 faces downward, so that the cover plate is vertically aligned with the substrate on the bonding table 5. (4) Pre-alignment and bonding Start the lifting motor 35, drive the lifting plate 38 to slowly lower the alignment plate 6, so that the touch screen cover is close to the substrate until the cover and the pre-adhesive layer of the substrate make slight contact (contact pressure ≤0.02MPa); at this time, the controller cuts off the adsorption effect of the first negative pressure pump 41 on the cover, and the cover is accurately covered on the substrate under its own weight and the initial adhesion of the adhesive layer, realizing the pre-alignment and bonding of the touch screen cover and the substrate; (5) Pre-bonding positioning and transfer of vacuum box 1 After pre-bonding is completed, the spacing adjustment motor 31 of the positioning and bonding mechanism is started, driving the spacing adjustment screw 29 to rotate. Since the set of mounting plates 7 far from the positioning plate 32 is connected to the spacing adjustment screw 29 by threads, and the other sets of mounting plates 7 are provided with sliding holes (the diameter of the sliding holes is larger than the diameter of the spacing adjustment screw 29) at the corresponding positions of the spacing adjustment screw 29 and are slidably mounted on the spacing adjustment slide rod 30, when the spacing adjustment screw 29 rotates, it only drives the set of mounting plates 7 far from the positioning plate 32 to slide along the spacing adjustment slide rod 30. This set of mounting plates 7 drives the other sets of mounting plates 7 to move synchronously through the scissor fork linkage 33 until the spacing between the sets of mounting plates 7 is adjusted to the preset position to match the touch screen, ensuring that the multiple sets of pressure rollers 10 can evenly cover the top of the touch screen cover. Then, the multiple sets of oil-free vacuum of the positioning and bonding mechanism are controlled. Cylinder 8 extends synchronously, and the pressure sensor monitors the output pressure in real time. When the pressure reaches 0.03~0.05MPa, the oilless vacuum cylinder 8 stops extending, and multiple sets of pressure rollers 10 are evenly pressed on the top of the touch screen cover to position and lock the pre-bonded cover and substrate, ensuring the accuracy of their alignment and preventing positional shifts between them when the push-pull mechanism 3 moves the bonding table 5, thus preventing misalignment of the touch area and affecting touch accuracy. Then, the servo push-pull motor 24 of the push-pull mechanism 3 is started, which drives two sets of push-pull screws 26 to rotate synchronously through bevel gear transmission, driving the push-pull plate 27 to move the box door 4 and the bonding table 5 along the guide rail into the vacuum box 1. When the box door 4 moves to completely block the inlet and outlet 2 of the vacuum box 1, the sealing strip 12 of the box door 4 is embedded in the sealing groove 11 of the vacuum box 1 to achieve vacuum sealing. (6) Staged vacuum pumping and roller defoaming First stage (low vacuum stage): The controller starts the main vacuum pump of the staged vacuum pump group to evacuate the vacuum chamber 1 to a low vacuum state of 500~1000Pa, maintain this vacuum level for 3~5s, initially remove the free air in the vacuum chamber 1, and prepare for subsequent defoaming. The vacuum sensor provides real-time feedback of vacuum level data to ensure pressure stability and avoid pressure sudden changes that could damage the touch electrode layer. The second stage (medium vacuum roller defoaming stage): The auxiliary vacuum pump is started to continue to raise the vacuum level in the vacuum chamber 1 to a medium vacuum state of 20~50Pa; the controller controls the other oil-free vacuum cylinders 8 except the first set of oil-free vacuum cylinders 8 to retract synchronously, driving the corresponding pressure rollers 10 to lift off the cover plate surface; then, by the reverse rotation of the spacing adjustment motor 31, the first set of pressure rollers 10 is driven to move above the touch screen cover plate at a speed of 2~3mm / s. The pressure sensor controls the output pressure of the oil-free vacuum cylinders 8 to be maintained at 0.08~0.12MPa. During the movement, the pressure rollers 10 roll the touch screen cover plate, squeezing out the air bubbles in the adhesive layer of the bonding surface between the touch screen cover plate and the substrate. The squeezed-out air bubbles are quickly removed through the adsorption holes 16 and adsorption chambers 17 of the bonding table 5 and the air pumping system of the vacuum chamber 1, achieving efficient defoaming, avoiding the residual air bubbles that cause uneven touch sensing and capacitance value fluctuations, and ensuring stable touch sensitivity; The third stage (high vacuum pressure holding stage): The auxiliary vacuum pump continues to work, evacuating the vacuum chamber 1 to an ultimate high vacuum state of ≤10Pa; the controller controls all oil-free vacuum cylinders 8 to extend synchronously, and multiple sets of pressure rollers 10 press on the top of the touch screen cover plate, with the pressure maintained at 0.05~0.1MPa. All pressure rollers 10 press in a static state for 6~10s to prevent air from entering the bonding surface, ensuring that the cover plate and the substrate are tightly bonded by the adhesive layer, while preventing the extruded air bubbles from seeping back, further ensuring stable touch signal transmission after bonding, and avoiding touch failure or response delay; (7) Depressurization and discharge and finished product handling After the pressure holding is completed, the controller stops the staged vacuum pump group, and the vacuum chamber 1 slowly recovers to atmospheric pressure within 5-10 seconds to avoid pressure shock causing deformation of the touch screen, prevent damage to the touch electrode layer or displacement of the touch area, and affect touch performance. After the pressure in the vacuum chamber 1 recovers to atmospheric pressure, the push-pull mechanism 3 is activated, driving the chamber door 4 to move the bonding table 5 out of the vacuum chamber 1. The controller disconnects the negative pressure adsorption of the substrate adsorption mechanism, and the operator or the automated material handling mechanism removes the bonded touch screen product from the substrate contouring groove 14. Then the equipment is reset to prepare for the next bonding process.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A touchscreen bonding device, characterized in that, include: A vacuum chamber (1) is provided with a push-pull mechanism (3) on its outer wall. The vacuum chamber (1) is connected to a vacuum pump group for graded control of the vacuum environment. The vacuum pump group includes a main vacuum pump and an auxiliary vacuum pump. The box door (4) is provided with a bonding platform (5) for adsorbing and carrying the substrate. The box door (4) is configured to be driven by the push-pull mechanism (3) to move the bonding platform (5) relative to the vacuum box (1) through the inlet and outlet (2). Alignment plate (6) is configured to correspond to bonding table (5) for adsorbing and carrying touch screen cover plate. The alignment plate (6) is raised and lowered relative to bonding table (5) to drive touch screen cover plate to move towards substrate. The positioning and bonding mechanism is located on the door (4) and is used for pre-bonding and positioning of the touch screen cover and substrate, removing air bubbles during vacuum bonding and pressing and positioning. The positioning and bonding mechanism includes multiple sets of mounting plates (7) with adjustable spacing. Each set of mounting plates (7) is provided with a set of oil-free vacuum cylinders (8) below it. The free end of the oil-free vacuum cylinders (8) is provided with a roller frame (9), and a pressure roller (10) is rotatably provided on the roller frame (9).

2. The touchscreen bonding device according to claim 1, characterized in that, The bonding platform (5) and the alignment plate (6) are respectively provided with a substrate contouring groove (14) and a cover plate contouring groove (15). The substrate contouring groove (14) and the cover plate contouring groove (15) are provided with multiple sets of adsorption holes (16). The bonding platform (5) and the alignment plate (6) are provided with adsorption cavities (17). The adsorption cavities (17) are connected to the adsorption holes (16). The bottom wall of the adsorption cavity (17) of the bonding platform (5) is provided with an adsorption through hole (18). The vacuum box (1) is provided with a substrate adsorption mechanism on the outside. The adsorption through hole (18) provides negative pressure adsorption force to the bonding platform (5). The adsorption cavity (17) of the alignment plate (6) is connected to the first negative pressure pump (41) through the telescopic corrugated pipe (40).

3. The touchscreen bonding device according to claim 2, characterized in that, The substrate adsorption mechanism includes a telescopic cylinder (19), an adsorption air supply plate (20), and a second negative pressure pump (21). The adsorption air supply plate (20) is located at the free end of the telescopic cylinder (19). An air supply chamber (22) is provided inside the adsorption air supply plate (20). An air supply groove (23) is provided on the top wall of the adsorption air supply plate (20). The air supply groove (23) is connected to the air supply chamber (22). The air supply groove (23) corresponds one-to-one with the adsorption through hole (18), and the diameter of the air supply groove (23) is smaller than the diameter of the adsorption through hole (18). The second negative pressure pump (21) is connected to the air supply chamber (22) through a telescopic corrugated pipe (40).

4. The touchscreen bonding device according to claim 1, characterized in that, The push-pull mechanism (3) includes a push-pull motor (24) and two sets of symmetrically arranged push-pull components. The push-pull components include a bearing seat (25), a push-pull screw (26), and a push-pull plate (27). The bearing seat (25) is located on the outer wall of the vacuum chamber (1). The push-pull screw (26) is rotatably mounted on the bearing seat (25). The push-pull plate (27) is connected to the push-pull screw (26) by a thread. The two sets of push-pull plates (27) are respectively connected to the two sides of the chamber door (4). The push-pull motor (24) is located on the outer wall of the vacuum chamber (1). One set of push-pull screws (26) is connected to the output shaft of the push-pull motor (24). The two sets of push-pull screws (26) rotate synchronously.

5. The touchscreen bonding device according to claim 1, characterized in that, The positioning and bonding mechanism includes a support (28), a spacing adjustment screw (29), and a spacing adjustment slide (30). The support (28) is located at one end of the bonding table (5) near the vacuum chamber (1). The spacing adjustment screw (29) is rotatably positioned between the chamber door (4) and the support (28). The spacing adjustment slide (30) is located between the chamber door (4) and the support (28) and is parallel to the spacing adjustment screw (29). A spacing adjustment motor (31) is provided on the outside of the chamber door (4). One end of the spacing adjustment screw (29) is parallel to the spacing adjustment motor (31). The output shaft of the box door (4) is connected to the positioning plate (32). The positioning plate (32) and multiple sets of mounting plates (7) are hinged together by a scissor link (33). One end of the mounting plate (7) away from the positioning plate (32) is connected to the spacing adjustment screw (29) by a thread, and the other end is slidably mounted on the spacing adjustment slide rod (30). The other sets of mounting plates (7) are provided with sliding holes at the corresponding positions of the spacing adjustment screw (29). The diameter of the sliding hole is larger than the diameter of the spacing adjustment screw (29) and is slidably mounted on the spacing adjustment slide rod (30).

6. The touchscreen bonding device according to claim 5, characterized in that, The spacing adjustment slide (30) is provided in at least two sets. Except for one set of mounting plates (7) connected to the spacing adjustment screw (29), the two ends of the other sets of mounting plates (7) are slidably disposed on the two sets of spacing adjustment slides (30).

7. The touchscreen bonding device according to claim 1, characterized in that, The vacuum chamber (1) is provided with a lifting drive mechanism. The lifting drive mechanism includes two sets of symmetrically arranged lifting components and a top plate (34). The lifting components include a lifting motor (35), a support column (36), a lifting screw (37), and a lifting plate (38). The top plate (34) is located at the upper end of the two sets of support columns (36). The lifting motor (35) is located on the top plate (34). The lifting screw (37) is rotatably located on the top plate (34) and connected to the output shaft of the lifting motor (35). The lifting plate (38) is connected to the lifting screw (37) by a thread and is slidably located on the support column (36). The alignment plate (6) is located on the lifting plate (38).

8. The touchscreen bonding device according to claim 7, characterized in that, Both sets of lifting plates (38) are provided with rotating shafts on opposite sides. The two ends of the alignment plate (6) are connected to the two sets of rotating shafts. One set of lifting plates (38) is provided with a rotating motor. The output shaft of the rotating motor is parallel to the axis of the rotating shaft and is not coaxial. The output shaft of the rotating motor is connected to the rotating shaft by a belt or chain. The rotating shaft on one set of lifting plates (38) is a hollow shaft. One end of the telescopic corrugated pipe (40) is rotatably connected to the hollow rotating shaft, and the end of the telescopic corrugated pipe (40) connected to the hollow rotating shaft is a rigid pipe.

9. A bonding method for a touchscreen bonding device, characterized in that, Specifically, the following steps are included: S1. External loading and pre-lamination: Outside the vacuum chamber, the touch screen cover is aligned and pre-lamination is performed with the substrate having an adhesive layer. S2, Pre-pressure locking: Apply pre-pressure to the cover plate and substrate after initial bonding to maintain their relative position during transfer into the box; S3. Insertion and Vacuuming: The pre-pressed and locked cover plate and substrate are moved into the vacuum chamber and sealed. Then, the vacuum chamber is evacuated. S4. Graded Collaborative Roller Defoaming: During the vacuuming process, different vacuum pressures are controlled to defoam and bond the product in collaboration with the pressure rollers. S5. Unloading: After restoring the vacuum chamber to normal pressure, remove the laminated product.

10. The bonding method of a touch screen bonding device according to claim 9, characterized in that, In step S4, the vacuum pressure and the pressure roller work together to perform the following operations: S41, maintain a low vacuum state of 500~1000Pa for 3~5s to initially remove the free air in the vacuum chamber (1); S42. Under a medium vacuum of 20~50Pa, control the movement of the first pressure roller on the surface of the cover plate to squeeze out air bubbles in the bonding layer. S43. Under the extreme high vacuum state of ≤10Pa, control multiple pressure rollers to press statically onto the surface of the cover plate to maintain the bonding pressure and prevent air bubbles from seeping back.

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