Homocentric-square-shaped gum positioning and pasting mechanism and method

Abstract

The invention relates to the technical field of gum pasting, in particular to a concentric-square-shaped gum positioning and pasting mechanism which comprises a gum fixing device and a transparent substrate fixing device, the transparent substrate fixing device comprises a transparent substrate fixing plate, and a fixing limiting block and an uncovering limiting block are arranged at the two ends of the transparent substrate fixing plate; the gum fixing device comprises a gum positioning table, a linear guide rail, a movable film tearing mechanism and a negative pressure gas circuit, two sliding blocks are arranged on the linear guide rail, and the sliding blocks are connected with the movable film tearing mechanism; a pressure-equalizing negative-pressure groove, a floating positioning block A and a floating positioning block B are arranged on the gum positioning table, and the pressure-equalizing negative-pressure groove is connected with an air pump through a negative-pressure air path; the movable film tearing mechanism comprises a fixed wing, an inclined plane frame, a contact rubber mat and a rotating shaft; through dynamic positioning, pressure-equalizing adsorption, mechanical optimization and modular design, the problems of easy deformation, many bubbles, low efficiency and the like in traditional back adhesive bonding are systematically solved, and the yield and speed of automatic production are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive backing positioning, in particular to a positioning and pasting mechanism and method for a circular adhesive backing. Background Art

[0002] 3M adhesive backing is an important part for achieving fixed connection of important components. The combination of transparent substrates (such as glass cover plates) with screens, touch and other functions is often used in white appliances, automotive interiors and other mechanisms. When producing the overall module, double-sided adhesive backing is required to bond the transparent substrate to other structural parts to achieve functional integrity.

[0003] Due to the characteristics of 3M adhesive backing such as easy deformation and soft material, there are many problems in manual attachment during the actual production process; the adhesive backing used in this patent is a circular structure, with a slender middle adhesive strip and a large bonding area at both ends. The transparent substrate is attached to the device, which is not a single-sided structure and requires higher attachment accuracy and requirements. Therefore, manual tearing of the film during operation can easily cause deformation. During the attachment process, bubbles, offsets, adhesive block stacking, and adhesive overflow are inevitable, resulting in low module appearance and bonding performance qualification rate and production efficiency. Summary of the Invention

[0004] A positioning and pasting mechanism for a circular adhesive backing, comprising an adhesive backing fixing device and a transparent substrate fixing device, wherein the transparent substrate fixing device comprises a transparent substrate fixing plate, and fixed limit blocks and cover opening limit blocks are provided at both ends of the transparent substrate fixing plate; The adhesive fixing device includes an adhesive positioning platform, a linear guide rail, a movable film tearing mechanism and a negative pressure air circuit. The linear guide rail is provided with two sliders, which are connected to the movable film tearing mechanism. The adhesive positioning platform is provided with a pressure-equalizing negative pressure tank and a floating positioning block A and a floating positioning block B, and the pressure-equalizing negative pressure tank is connected to an air pump through a negative pressure air circuit; The movable film tearing mechanism includes a fixed wing, an inclined plane frame, a contact rubber pad and a rotating shaft; the inclined plane frame is provided with two inclined planes in the horizontal moving direction, the middle section of the rotating shaft is provided with a concave and convex tooth-shaped groove, and centrifugal grooves are symmetrically opened on both sides, and the gap in the centrifugal groove is provided with a matching centrifugal bearing, and the release paper is clamped by the friction contact between the centrifugal bearing and the tooth-shaped groove.

[0005] A negative pressure pipeline is provided below the pressure-equalizing negative pressure tank. The negative pressure pipeline includes an internal pipeline, an external pipeline and a five-way valve. The internal pipelines are combined into an external pipeline and then connected to the air pump through the five-way valve.

[0006] The adhesive-backed positioning platform is provided with a contoured platform, wherein a hollowed-out area in the middle reserves space for the protruding components of the transparent substrate assembly.

[0007] The floating positioning block A and the floating positioning block B are placed symmetrically, and a profiling groove is provided at the corresponding position on the profiling table surface. The positioning block A and the positioning block B are trapezoidal bodies, and an inclined surface structure is provided in the moving direction of the guide rail, and they are connected to the bottom of the profiling groove through compression springs A and compression springs B.

[0008] The adhesive backing fixing device also includes a base, a bottom plate is provided on the base, and the adhesive backing positioning platform is installed on the bottom plate.

[0009] The sliding block is connected to the fixed wing.

[0010] The fixed limit block and the cover opening limit block are both provided with anti-wear rubber pads. The cover opening limit block includes a cover plate, a U-shaped block and a bolt. The cover plate and the U-shaped block are provided with threads.

[0011] A method for positioning and pasting a paper-shaped adhesive tape comprises the following steps: S1: Place the adhesive backing on the contoured surface of the adhesive backing positioning table, and use the trapezoidal inclined surface structure and compression spring of floating positioning block A and floating positioning block B for positioning; S2: Start the air pump to evenly absorb the adhesive through the negative pressure tank and adjust the position of the adhesive; S3: Slide the tearing mechanism to the starting point of the adhesive backing, and push the floating positioning block A and the floating positioning block B downward through the inclined frame until the tearing mechanism contacts the adhesive backing; S4: inserting the release paper into the toothed groove of the rotating shaft, clamping the release paper with the centrifugal bearing, starting the rotary motor to drive the rotating shaft to rotate and horizontally move the inclined plane frame; S5: Place the glass assembly into the fixed stopper and the cover opening stopper of the transparent substrate fixing plate, and tighten the bolts to complete the fixation; S6: Align the transparent substrate fixing plate with the glass positioning groove and press down to compress the floating positioning block A and the floating positioning block B to achieve complete adhesion between the adhesive and the glass.

[0012] In step S4, the inclined angle of the inclined plane frame decomposes the vertical pulling force into horizontal thrust, thereby reducing the tensile deformation of the adhesive.

[0013] In step S5, the fixed limit block and the cover opening limit block are embedded with anti-wear rubber pads to prevent the glass surface from being scratched.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The up and down floating design of the spring floating positioning block ensures the precise positioning of the adhesive while avoiding structural interference with other mechanical components, thereby improving operational smoothness and reliability.

[0015] 2. Use a pressure-equalizing negative pressure tank combined with a five-way valve to adjust the negative pressure distribution to ensure uniform pressure in each area during adhesive adsorption, avoid local deformation or warping, and improve bonding stability.

[0016] 3. The friction contact design between the centrifugal bearing and the toothed groove achieves stable clamping and release of the release paper. When the inclined plane frame moves horizontally, the vertical tension is decomposed into horizontal thrust through the inclined plane angle, effectively reducing the tensile deformation during the adhesive film tearing process. During the movement, the contact pad simultaneously smoothes the adhesive, significantly reducing the probability of bubbles and wrinkles, and improving the bonding quality.

[0017] 4. The adhesive backing fixing device and the transparent substrate fixing device of the present invention are designed independently, which simplifies the transmission structure and reduces the complexity of the mechanism; the transparent substrate is quickly and accurately positioned through the limit groove and the linkage pressing mechanism, which greatly improves the production efficiency while ensuring the fitting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Axonometric diagram of the adhesive positioning device Figure 2 Axonometric diagram of glass positioning plate Figure 3 Schematic diagram of the bottom of the adhesive positioning device Figure 4 Schematic diagram of negative pressure equalizing tank and pipeline Figure 5 Axonometric diagram of floating positioning block 3 Figure 6 Axonometric diagram of floating positioning block 4 Figure 7 Axonometric diagram of the film tearing mechanism Figure 8 Axonometric diagram of the rotating shaft Figure 9 Schematic diagram of the shaft cross section In the figure: 1-adhesive positioning platform; 2-rectangular pressure-equalizing negative pressure groove; 3-floating positioning block 1; 301-positioning block 1; 302-compression spring 1; 4-floating positioning block 2; 401-positioning block 2; 402-compression spring 2; 5-movable paper tearing mechanism; 501-fixed wing; 502-inclined frame; 503-contact rubber pad 2; 504-rotating shaft; 505-rotating motor; 506-centrifugal tank; 507-centrifugal tank Mandrel bushing; 508-toothed groove; 6-negative pressure air circuit; 601-internal pipeline; 602-external pipeline; 7-glass fixing plate; 701-fixed limit block; 702-opening limit block; 703-cover plate; 704-U-shaped block; 705-bolt; 8-base plate; 9-glass positioning groove; 10-anti-wear rubber pad 1; 11-base; 12-linear guide rail; 13-slider; 14-five-way valve; 15-air pump; DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0020] like Figure 1-8 As shown, a positioning and pasting mechanism for circular adhesive backing includes two mechanisms: an adhesive fixing device and a transparent substrate fixing device. The adhesive fixing device mainly includes an adhesive positioning platform 1, a linear guide 12, a movable paper tearing mechanism 5, and a negative pressure air circuit 6. The adhesive positioning platform 1 has a contoured table top, with a hollowed-out area in the middle to leave space for the raised components of the transparent substrate assembly. A rectangular pressure-equalizing negative pressure tank 2 is provided on the contoured table top, and an internal pipeline 601 is opened below the pressure-equalizing negative pressure tank 2. The pipelines in the same area are connected to the external pipeline 602 after being combined. The four area pipelines are connected to the air pump 15 through a five-way valve 14. When the air pump 15 is started, the negative pressure generated in the air circuit 6 is used to absorb the adhesive backing. The negative pressure equalizing tank 2 evens out the air pressure to avoid pressure concentration.

[0021] There are two floating positioning blocks A3 at each end of the contoured table, and four floating positioning blocks B4 in the fine glue area, all symmetrically placed. Contoured grooves are provided at corresponding positions on the table. Positioning blocks 301A and 401B are both provided with inclined structures in the moving direction of the guide rail 12, and are connected to the bottom of the grooves via compression springs A302 and B402. The base 11 is provided with a bottom plate 8 and a back-adhesive positioning platform 1 in sequence, and the linear guide rail 12 has two sliders 13 which are connected to the movable film-tearing mechanism 5 on the back-adhesive positioning platform 1 by screw threads; the film-tearing mechanism 5 comprises an inclined frame 502, a fixed wing 501, a contact rubber pad 503 and a rotating shaft 504, wherein the fixed wing 501 is connected to the slider 13, the contact rubber pad 503 is in contact with the back-adhesive, the middle of the inclined frame 502 is hollowed out and a rotating shaft 504 is installed; the middle part of the inclined frame 502 is a concave-convex toothed groove 508, and one end is provided with a Rotate the motor 505; centrifugal grooves 506 of a certain depth are symmetrically opened on both sides of the centrifugal groove, with the A end close to the toothed groove 508 and the B end originally away from the toothed structure. The centrifugal groove 506 is equipped with a centrifugal bearing 507, which is shorter than the centrifugal groove 506; the centrifugal bearing 507 clamps and releases the adhesive-backed release paper by rotating in the centrifugal groove 506 and frictionally contacting the toothed structure; the rotating motor 505 drives the rotating shaft 504 to rotate, tightening the release film, and cooperates with the horizontal movement of the inclined frame 502 to complete the film tearing work. The upward pulling force during the film tearing process by the inclined surface decomposition can effectively reduce the deformation of the adhesive backing. Since the contact rubber pad 503 contacts and moves with the release film, it can effectively smooth the adhesive backing and avoid the generation of bubbles during bonding. The floating positioning blocks 3 and 4 are in contact with the inclined frame 502. They are automatically compressed by the inclined surface on the floating positioning block. When leaving, the spring bounces up to always maintain the positioning work.

[0022] The transparent substrate fixing device 7 is provided with a fixed limit block 701 and a cover-opening limit block 702 at both ends. The cover-opening limit block includes a cover plate 703 and a U-shaped block 704, which is provided with a thread. The transparent substrate is fixed by screwing in two bolts 705; the fixed limit block 701 and the cover-opening limit block 702 are both provided with anti-wear rubber pads 706 to protect the contact surface of the transparent substrate.

[0023] like Figure 1-8 As shown, the circular adhesive positioning and pasting mechanism of this patent consists of an adhesive fixing device and a transparent substrate fixing device. The specific implementation method is as follows: The adhesive fixing device includes an adhesive positioning platform 1, a linear guide 12, a movable film-tearing mechanism 5, and a negative pressure air circuit 6. The adhesive positioning platform 1 has a hollowed-out area in the middle of its contoured surface to accommodate the protruding components of the transparent substrate assembly. A rectangular pressure-equalizing negative pressure tank 2 is located on the surface, connected to an external pipe 602 via an internal pipe 601 below. These four pipes connect to an air pump 15 via a five-way valve 14. When the air pump 15 is activated, the suction force generated by the negative pressure circuit 6 is uniformly applied to the adhesive through the pressure-equalizing negative pressure tank 2, preventing deformation caused by localized pressure concentration.

[0024] Two floating positioning blocks A3 are symmetrically positioned at each end of the contouring tabletop, while four floating positioning blocks B4 are located in the fine glue area. Contouring slots are defined at the corresponding positions on the tabletop. Positioning blocks A3 and B4 are trapezoidal, with inclined surfaces along the direction of movement of the linear guide rail 12. These blocks are connected to the bottom of the contouring slots via compression springs A302 and B402, enabling the machine to float upward and downward.

[0025] The base 11 is provided with a bottom plate 8 and an adhesive positioning platform 1, a linear guide rail 12 is fixed to the base 11, and two sliders 13 thereon are connected to the movable film tearing mechanism 5 by screw threads. The movable film tearing mechanism 5 comprises: Fixed wing 501: fixed to the slider 13; Inclined frame 502: has two inclined planes in the horizontal moving direction, and a rotating shaft 504 is installed in the hollow area in the middle; The rotating shaft 504 has a concave-convex toothed groove 508 in the middle section, and centrifugal grooves 506 are symmetrically provided on both sides. The clearance inside the centrifugal grooves 506 is matched with the centrifugal bearing bush 507. Contact adhesive pad 503: in contact with the adhesive backing surface.

[0026] The rotating motor 505 drives the rotating shaft 504, causing the centrifugal bearing 507 to frictionally contact the toothed grooves 508 within the centrifugal groove 506, thereby clamping and releasing the release paper. When the ramp frame 502 moves horizontally, the inclined surface converts vertical tension into horizontal thrust, reducing stretching and deformation of the adhesive. Simultaneously, the contact pad 503 smoothes the adhesive as it moves, effectively suppressing air bubbles. When the ramp frame 502 makes contact, the floating positioning blocks A3 and B4 are compressed to be flush with the table surface, ensuring smooth movement of the mechanism. After disengagement, springs return the components to maintain positioning.

[0027] The transparent substrate securing device includes a transparent substrate securing plate 7, with fixed stoppers 701 and lid-opening stoppers 702 at each end. The lid-opening stopper 702 comprises a cover plate 703, a U-shaped block 704, and a bolt 705. The cover plate 703 and the U-shaped block 704 are internally threaded, and the transparent substrate is secured by tightening the bolt 705. Anti-wear rubber pads 706 are embedded in the fixed stopper 701 and the lid-opening stopper 702 to prevent scratches on the transparent substrate surface. When the transparent substrate securing plate 7 is closed, it is precisely positioned using the glass positioning groove 9. Pressing down drives the floating positioning blocks A3 and B4 to compress, ensuring that the adhesive backing is fully adhered to the transparent substrate.

[0028] One implementation step of this patent is as follows: Step 1: Adhesive positioning and adsorption Place the adhesive: Place the circular adhesive on the contoured surface of the adhesive positioning table 1, and perform preliminary positioning through the trapezoidal inclined surface structure of the floating positioning block A3 and the floating positioning block B4 and the compression spring A302 and the compression spring B402; Start negative pressure adsorption: Turn on the air pump 15 to evenly adsorb the adhesive through the negative pressure equalization tank 2, and use the five-way valve 14 to adjust the negative pressure in each area to ensure that the adhesive is flat and without deformation; Fine-tune the position: Manually or via sensors, adjust the adhesive position to precisely align with the contoured tabletop.

[0029] Step 2: Remove the release paper Move the film tearing mechanism to the starting end: slide the film tearing mechanism 5 along the linear guide rail 12 to the starting end of the adhesive backing, and the inclined plane frame 502 contacts the inclined plane of the floating positioning block A3 and the floating positioning block B4, pressing them down to be flush with the table surface to avoid interference of the mechanism; Clamping the release paper: insert the adhesive-backed release paper into the tooth-shaped groove 508 of the rotating shaft 504, start the rotary motor 505 to drive the rotating shaft 504 to rotate, and the centrifugal bearing 507 rubs against the tooth-shaped groove 508 under the action of centrifugal force to clamp the release paper; Uniform speed film tearing: The inclined plane frame 502 moves horizontally, and its inclined plane angle decomposes the vertical pulling force into horizontal thrust, thereby reducing the tensile deformation of the adhesive. At the same time, the contact adhesive pad 503 smoothes the adhesive as it moves, thereby reducing the generation of bubbles.

[0030] Step 3: Fixing and bonding the transparent substrate Fix the transparent substrate: insert one side of the transparent substrate (such as a glass cover) into the fixed stopper 701, and place the other side into the U-shaped block 704 of the cover opening stopper 702, and tighten the bolts 705 to complete the fixation; Press down and fit: Align the transparent substrate fixing plate 7 with the glass positioning groove 9 and press lightly, drive the floating positioning block A3 and the floating positioning block B4 to compress back to ensure that the backing adhesive is in full contact with the transparent substrate; Check the bonding quality: Use the pressure sensor or visually inspect the bonding area to confirm that there are no bubbles, misalignment or glue overflow.

[0031] Step 4: Reset and cycle operation Reset the film tearing mechanism: Move the movable film tearing mechanism 5 back to the starting end along the linear guide rail 12, and the floating positioning block A3 and the floating positioning block B4 are reset under the action of the spring; Replace the adhesive backing and substrate: Remove the bonded components, replace the new adhesive backing and transparent substrate, and repeat the above steps for the next cycle.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

Claims

1. A positioning and pasting mechanism for a paper-shaped adhesive tape, characterized in that: It comprises a back glue fixing device and a transparent substrate fixing device, wherein the transparent substrate fixing device comprises a transparent substrate fixing plate (7), and both ends of the transparent substrate fixing plate (7) are provided with a fixed limit block (701) and a cover opening limit block (702); The adhesive fixing device comprises an adhesive positioning platform (1), a linear guide rail (12), a movable film-tearing mechanism (5), and a negative pressure air circuit (6); two sliders (13) are provided on the linear guide rail (12); the sliders (13) are connected to the movable film-tearing mechanism (5); The adhesive-backed positioning platform (1) is provided with a pressure-equalizing negative pressure tank (2), a floating positioning block A (3), and a floating positioning block B (4); the pressure-equalizing negative pressure tank (2) is connected to an air pump (15) via a negative pressure air path (6); The movable film tearing mechanism (5) comprises a fixed wing (501), an inclined plane frame (502), a contact rubber pad (503) and a rotating shaft (504); the inclined plane frame (502) is provided with two inclined planes in the horizontal moving direction, the middle section of the rotating shaft (504) is provided with a concave-convex tooth-shaped groove (508), and centrifugal grooves (506) are symmetrically opened on both sides, and a matching centrifugal bearing (507) is provided in the gap inside the centrifugal groove (506), and the release paper is clamped by friction contact between the centrifugal bearing (507) and the tooth-shaped groove (508).

2. A positioning and pasting mechanism for a paper-shaped adhesive tape according to claim 1, characterized in that: A negative pressure pipeline (6) is provided below the pressure-equalizing negative pressure tank (1), and the negative pressure pipeline (6) comprises an internal pipeline (601), an external pipeline (602), and a five-way valve (14). The internal pipelines (601) are combined into an external pipeline (602), which is then connected to the air pump (15) via the five-way valve (14).

3. The positioning and pasting mechanism of the paper-shaped adhesive according to claim 1, characterized in that: The adhesive-backed positioning platform (1) is provided with a contoured platform, wherein a hollowed-out area in the middle reserves space for the raised components of the transparent substrate assembly.

4. The positioning and pasting mechanism of the paper-shaped adhesive according to claim 1, characterized in that: The floating positioning block A (3) and the floating positioning block B (4) are both symmetrically placed, and a profiling groove is provided at a corresponding position on the profiling table surface. The positioning block A (301) and the positioning block B (401) are trapezoidal bodies, and an inclined surface structure is provided along the moving direction of the linear guide rail (12), and are respectively connected to the bottom of the profiling groove through a compression spring A (302) and a compression spring B (402).

5. The positioning and pasting mechanism of the paper-shaped adhesive according to claim 1, characterized in that: The adhesive backing fixing device further comprises a base (11), a bottom plate (8) is provided on the base (11), and the adhesive backing positioning platform (1) is mounted on the bottom plate (8).

6. The positioning and pasting mechanism of the paper-shaped adhesive according to claim 1, characterized in that: The slider (13) is connected to the movable film-tearing mechanism (5) via the fixed wing (501).

7. The positioning and pasting mechanism of the paper-shaped adhesive according to claim 1, characterized in that: The fixed limit block (701) and the cover opening limit block (702) are both provided with anti-wear rubber pads (706). The cover opening limit block (702) comprises a cover plate (703), a U-shaped block (704) and a bolt (705). The cover plate (703) and the U-shaped block (704) are provided with threads.

8. A method for positioning and pasting a paper-shaped adhesive tape, characterized in that: The following steps are involved: S1: Place the adhesive backing on the contoured surface of the adhesive backing positioning table (1), and use the trapezoidal inclined surface structure of the floating positioning block A (3) and the floating positioning block B (4) and the compression spring A (302) and the compression spring B (402) for positioning; S2: Start the air pump (15), evenly absorb the adhesive through the negative pressure tank (2), and adjust the position of the adhesive; S3: Slide the tearing mechanism (5) to the beginning of the adhesive backing, and push the floating positioning block A (3) and the floating positioning block B (4) downward through the inclined frame (502) until the tearing mechanism (5) contacts the adhesive backing; S4: inserting the release paper into the toothed groove (508) of the rotating shaft (504), clamping the release paper through the centrifugal bearing (507), starting the rotating motor (505) to drive the rotating shaft (504) to rotate and horizontally move the inclined plane frame (502); S5: Place the glass assembly into the fixed stopper (701) and the cover opening stopper (702) of the transparent substrate fixing plate (7), and tighten the bolts (705) to complete the fixation; S6: Align the transparent substrate fixing plate (7) with the glass positioning groove (9) and press it down to compress the floating positioning block A (3) and the floating positioning block B (4) to achieve complete adhesion between the back glue and the glass.

9. The method for positioning and pasting a paper-shaped adhesive tape according to claim 8, characterized in that: In step S4, the inclined plane angle of the inclined plane frame (502) decomposes the vertical pulling force into the horizontal thrust.

10. The method for positioning and pasting a paper-shaped adhesive tape according to claim 8, characterized in that: In step S5, the fixed limit block (701) and the cover opening limit block (702) are embedded with anti-wear rubber pads (706).

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