Crimping jig for flexible circuit board of touch screen
By combining the touch screen clamping mechanism and the vacuum control mechanism, the problem of poor crimping and mechanical damage caused by minute displacement during the touch screen bonding process of flexible circuit boards is solved, realizing automated positioning and efficient production.
Patent Information
- Application Number
- CN202511397848.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-01-20
AI Technical Summary
In the touch screen manufacturing process, flexible circuit boards are prone to poor crimping due to slight displacement when being bonded to touch screen pins. Furthermore, traditional mechanical clamping methods can easily damage the circuitry and make component removal difficult, thus reducing production efficiency.
The touch screen and flexible circuit board are fixed by a touch screen clamping mechanism and a circuit board clamping mechanism respectively. The flexible circuit board is precisely aligned and automatically positioned by a vacuum control mechanism using negative pressure adsorption and non-contact positive pressure blowing, thus avoiding mechanical damage.
It achieves precise alignment and automated positioning of flexible circuit boards, improves production cycle time, avoids circuit board bending and solder joint damage, and ensures connection stability and production efficiency.
Smart Images
Figure CN121368081A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of equipment manufacturing printed circuit, in particular to a touch screen flexible circuit board crimping jig. BACKGROUND
[0002] In the manufacturing process of the touch screen, the flexible circuit board needs to be accurately bound to the specified pin of the touch screen through a hot pressing process, which is usually completed by using a hot press and a special crimping jig. In the process of binding the flexible circuit board to the resistive touch screen, a small piece of anisotropic conductive adhesive tape is usually cut according to the width of the flexible circuit board and the size of the binding area, and then it is accurately attached to the indium tin oxide pad area of the glass edge of the touch screen by using an attaching device (or manually with the help of tweezers). A small preheated pressure head is used to lightly press the anisotropic conductive adhesive, so that it is initially adhered to the glass. Secondly, the gold finger terminal of the flexible circuit board is accurately aligned with the anisotropic conductive adhesive tape pre-attached to the touch screen. After the alignment is completed, the pressure head of the hot press will be lowered and accurately pressed on the back of the flexible circuit board. The pressure head provides high temperature (usually about 180°C - 220°C) and high pressure at the same time, and maintains for a period of time (a few seconds to tens of seconds). Finally, the pressure head is lifted, and the binding point is naturally cooled to make the anisotropic conductive adhesive completely solidified to achieve the final connection strength.
[0003] In the process of binding the flexible circuit board to the touch screen, the base material and copper foil of the flexible circuit board are very thin, with a total thickness of zero point several millimeters or even thinner. The flexible circuit board is easy to bend and wind, so it is easy to cause poor crimping due to slight displacement during crimping. The traditional mechanical clamping method not only has poor fixing effect, but also easily damages the precise circuit and pad on the surface of the flexible circuit board. In addition, after crimping is completed, the flexible circuit board may sometimes stick to the jig due to static electricity, making it difficult to take out and requiring manual peeling by the operator, which not only risks damaging the product, but also reduces the production rhythm. SUMMARY
[0004] In view of the deficiencies in the prior art, the present application provides a touch screen flexible circuit board crimping jig to solve the problems raised in the background art.
[0005] The purpose of the present application is achieved by a touch screen flexible circuit board crimping jig, comprising: a support plate arranged on the workbench surface of a hot press; a touch screen clamping mechanism fixedly installed on the surface of the support plate; a circuit board clamping mechanism fixedly installed on the surface of the support plate, comprising a first base, an adjusting assembly and a loading platform, the adjusting assembly is installed on the first base, the loading platform is fixedly connected to the surface of the adjusting assembly, and the surface of the loading platform has a positioning groove; The limiting auxiliary mechanism is located between the touch screen clamping mechanism and the circuit board clamping mechanism, and comprises a second base and a limiting plate, the second base is fixedly connected to the surface of the support plate, the limiting plate is fixedly connected to the upper end of the second base, the surface of the limiting plate is provided with a first limiting groove on the side close to the touch screen clamping mechanism, and the surface of the limiting plate is provided with a second limiting groove on the side close to the circuit board clamping mechanism. The support plate is further provided with a vacuum control mechanism, the carrier is provided with a vacuum chamber, and the working surface of the carrier is provided with a first micropore array in communication with the vacuum chamber.
[0006] Preferably, the touch screen clamping mechanism comprises a support seat fixedly installed on the surface of the support plate, the surface of the support seat is fixedly connected with a support table, the surface of the support table is provided with a clamping groove, the surface of the support table is detachably connected with a clamping plate, the clamping plate and the limiting plate are in abutment with the short side of the touch screen, and a center clamping assembly is installed on the support seat.
[0007] Preferably, the center clamping assembly comprises a first motor, the output end of the first motor is fixedly connected with a first connecting rod, the two ends of the first connecting rod are both hingedly connected with a second connecting rod, the free end surface of the second connecting rod is hingedly connected with a sliding block, the surface of the sliding block is rotatably connected with a clamping wheel, the outer wall of the clamping wheel is in abutment with the long side of the touch screen, and the surface of the support table is provided with a sliding groove, and the sliding block is slidingly connected in the sliding groove.
[0008] Preferably, the outer wall of the clamping wheel is covered with a rubber ring.
[0009] Preferably, the adjusting assembly comprises a second motor fixed to the side wall of the first base, the output end of the second motor is fixedly connected with a ball screw, the outer wall of the ball screw is connected with a first sliding table through a nut seat, the surface of the first base is fixedly connected with a first guide rail, the first sliding table is slidingly connected with the first guide rail, the surface of the first sliding table is slidingly connected with a second sliding table, a differential head is connected between one side of the second sliding table and the first base, a shock absorber is fixedly connected between the other side of the second sliding table and the first base, the second sliding table is fixedly connected with the carrier, and the differential head and the ball screw are perpendicular to each other.
[0010] Preferably, the carrier is provided with symmetrical limiting blocks at one end close to the limiting auxiliary mechanism, the bottom of the limiting block is fixedly connected with a rubber pad, and the bottom of the rubber pad is attached to the surface of the touch screen.
[0011] Preferably, the bottom of the support plate is provided with a conveying mechanism, the conveying mechanism comprises a second guide rail and a pneumatic cylinder, the second guide rail and the pneumatic cylinder are both fixed on the workbench of the hot press, the support plate is slidingly connected to the surface of the second guide rail, and the output end of the pneumatic cylinder is fixedly connected with the support plate.
[0012] Preferably, the vacuum control mechanism comprises a vacuum generating unit, an air path integrated block, a positive air pressure generating unit and an air path switching valve, the positive air pressure generating unit is used for adjusting the pressure and flow of the output positive pressure gas, the air path integrated block has a first air path and a second air path which are independent of each other inside, the first air path is connected with the vacuum generating unit, the second air path is connected with the positive air pressure generating unit, the air path integrated block is provided with a working interface, the air path switching valve is fixedly installed in the air path integrated block, the air path switching valve is used for controlling the working interface to be communicated with the first air path or the second air path, and the working interface is connected with the vacuum chamber through a pipeline.
[0013] Preferably, the vacuum generating unit is a Venturi vacuum generator, and the positive air pressure generating unit is a proportional valve or a pressure regulating valve.
[0014] Preferably, the carrier is provided with a second micro-hole array at one end close to the limiting auxiliary mechanism, each hole in the second micro-hole array is an inclined hole, the vacuum chamber is divided into two sub-chambers which are in air-tight isolation from each other by a built-in sealing partition wall, one of the sub-chambers is communicated with the first micro-hole array, and the other sub-chamber is communicated with the second micro-hole array, the second micro-hole array is located between adjacent limiting blocks, each sub-chamber is connected with one working interface on the air path integrated block through an independent sub-pipeline, and an electromagnetic valve is fixedly installed on each sub-pipeline.
[0015] Compared with the prior art, the present application has the following beneficial effects: 1. The touch screen and the flexible circuit board are independently fixed by the touch screen clamping mechanism and the circuit board clamping mechanism, which provides a basis for accurate alignment. In addition, the vacuum chamber and the first micro-hole array in the carrier are controlled by the vacuum control mechanism, the flexible circuit board is fixed by negative pressure adsorption, the industry problems of difficult fixation and easy damage of flexible parts are solved, the fixation force is uniform and there is no mechanical damage, and at the same time, the vacuum system adopts non-contact positive pressure blowing demolding, which completely avoids the risks of bending, deformation and solder damage of the flexible circuit board caused by traditional manual peeling, realizes the automation of the process after crimping is completed, greatly improves the production rhythm and reduces manual intervention.
[0016] 2. The clamping groove preliminarily positions the touch screen, the clamping plate and the limiting plate cooperatively complete the bidirectional limiting of the short side of the touch screen, the center clamping assembly automatically clamps the long side of the touch screen and centers it, eliminates the product position error caused by manual placement deviation, realizes the rapid, accurate and automatic positioning of the touch screen, and ensures the uniformity of the reference of each crimping.
[0017] 3. During the initial placement of the flexible circuit board, the limiting block can position the gold finger terminals of the flexible circuit board. In addition, when the gold finger terminals of the flexible circuit board are transported to the indium tin oxide (ITO) pad area of the touch screen, the limiting block is located at the edge of the ITO pad of the touch screen. At this time, the limiting block can check whether the flexible circuit board and the touch screen are aligned. At the same time, when using a hot press, the limiting block can prevent the anisotropic conductive adhesive from flowing outside the touch screen pad area, thereby improving the connection stability between the gold finger terminals of the flexible circuit board and the ITO pad of the touch screen.
[0018] 4. Through the synergistic effect of the vacuum control mechanism and the second micro-hole array, uniform negative pressure guidance is achieved, causing the gold finger terminals of the flexible circuit board to move downwards towards the indium tin oxide pad area of the touch screen, thus playing an auxiliary role in crimping. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0020] Figure 1 This is a three-dimensional structural diagram of a touch screen flexible circuit board crimping fixture in one embodiment.
[0021] Figure 2 This is a schematic diagram of the structure of a touch screen clamping mechanism in one embodiment.
[0022] Figure 3 This is a schematic diagram of the centering clamping component structure in one embodiment.
[0023] Figure 4 This is a schematic diagram of the circuit board clamping mechanism in one embodiment.
[0024] Figure 5 This is a schematic diagram of the adjustment component structure in one embodiment.
[0025] Figure 6 This is a schematic diagram of the limiting auxiliary mechanism in one embodiment.
[0026] Figure 7 This is a front view structural diagram of the touch screen flexible circuit board crimping fixture in one embodiment.
[0027] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the diagram.
[0028] Figure 9 Fig. 2 is a schematic view of a cross-sectional structure of a supporting part in an embodiment.
[0029] Figure 10 Fig. 3 is a schematic view of a connection structure between a vacuum control mechanism and a supporting part in an embodiment.
[0030] Figure 11 Fig. 4 is a schematic view of a structure of a vacuum control mechanism in an embodiment.
[0031] Reference signs: 100, supporting plate; 200, touch screen clamping mechanism; 210, supporting seat; 220, supporting table; 230, clamping groove; 240, clamping plate; 250, centering clamping assembly; 251, first motor; 252, first connecting rod; 253, second connecting rod; 254, sliding block; 255, clamping wheel; 256, rubber ring; 260, sliding groove; 300, circuit board clamping mechanism; 301, vacuum chamber; 302, first micro-hole array; 303, second micro-hole array; 304, sealing partition wall; 310, first base; 320, adjusting assembly; 321, second motor; 322, ball screw; 323, first sliding table; 324, first guide rail; 325, second sliding table; 326, differential head; 327, shock absorber; 330, supporting part; 340, positioning groove; 350, limiting block; 360, rubber gasket; 400, limiting auxiliary mechanism; 410, second base; 420, limiting plate; 430, first limiting groove; 440, second limiting groove; 450, groove; 500, vacuum control mechanism; 510, vacuum generating unit; 520, gas path integrated block; 521, first gas path; 522, second gas path; 523, working interface; 530, positive pressure generating unit; 540, gas path switching valve; 550, electromagnetic valve; 600, conveying mechanism; 610, second guide rail; 620, air cylinder. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0033] As shown in Figures 1-11 Fig. 1, a touch screen flexible circuit board crimping jig includes a supporting plate 100, a touch screen clamping mechanism 200, a circuit board clamping mechanism 300, a limiting auxiliary mechanism 400, and a vacuum control mechanism 500.
[0034] Please refer to Figure 1The support plate 100 is arranged on the workbench of the hot press, and the touch screen clamping mechanism 200 is fixedly installed on the surface of the support plate 100.
[0035] Specifically, please refer to Figure 2 The touch screen clamping mechanism 200 comprises a support base 210 fixedly installed on the surface of the support plate 100, the surface of the support base 210 is fixedly connected with a support table 220, the surface of the support table 220 is provided with a clamping groove 230, and the surface of the support table 220 is detachably connected with a clamping plate 240. The clamping plate 240 and the limiting auxiliary mechanism 400 are both in abutment with the short side of the touch screen. A center clamping assembly 250 is installed on the support base 210, which is used for clamping the long side of the touch screen and fixing the touch screen in the center.
[0036] It should be noted that the surface of the support table 220 is provided with a plurality of adjusting holes (not labeled in the figure), and the surface of the clamping plate 240 is provided with an adjusting groove (not labeled in the figure). A bolt penetrates through the adjusting groove and the corresponding adjusting hole, so that the clamping plate 240 can be fixed on the support table 220 according to the length of the touch screen, and the position of the clamping plate 240 can be adjusted according to the size of the touch screen.
[0037] The clamping groove 230 preliminarily positions the touch screen, and the clamping plate 240 and the limiting auxiliary mechanism 400 cooperatively complete the bidirectional limiting of the short side of the touch screen. The center clamping assembly 250 automatically clamps the long side of the touch screen and makes it in the center, eliminating the product position error caused by manual placement deviation, realizing the rapid, accurate and automatic positioning of the touch screen, and ensuring the uniformity of the reference of each pressure connection.
[0038] Specifically, please refer to Figure 3 The center clamping assembly 250 comprises a first motor 251, which is a servo motor or a stepping motor with a limit. The output end of the first motor 251 is fixedly connected with a first connecting rod 252, both ends of the first connecting rod 252 are hingedly connected with a second connecting rod 253, the free end surface of the second connecting rod 253 is hingedly connected with a sliding block 254, the surface of the sliding block 254 is rotatably connected with a clamping wheel 255, the outer wall of the clamping wheel 255 is in abutment with the long side of the clamping touch screen, the surface of the support table 220 is provided with a sliding groove 260, and the sliding block 254 is slidingly connected in the sliding groove 260.
[0039] It should be noted that the cross-sectional area of the clamping wheel 255 is larger than that of the sliding block 254, which can prevent the clamping wheel 255 from being separated from the support table 220 during clamping, and the sliding groove 260 is a T-shaped groove.
[0040] The specific working process of the center clamping assembly 250 is as follows: 1. Initial state: the operator puts the touch screen into the clamping groove 230 of the support table 220, and puts one of its short edges close to the limiting auxiliary mechanism 400. At this time, the center clamping assembly 250 is in an open state, and the two sliders 254 are respectively located at the far end of the sliding groove 260, and the distance between the two clamping wheels 255 is greater than the length of the touch screen, leaving sufficient space for the touch screen to be put in. The first motor 251 is in standby.
[0041] 2. Start and drive: the operator can issue a start instruction through the control system, which can be a button, PLC or automatic sensor signal. After receiving the signal, the first motor 251 starts to rotate.
[0042] 3. Linkage transmission and motion conversion: the rotary motion of the first motor 251 directly drives the synchronous rotation of the first linkage 252 fixedly connected thereto. The two ends of the first linkage 252 are respectively hinged to a second linkage 253. When the first linkage 252 rotates, it pulls or pushes the two second linkages 253, and the other end of the second linkage 253 is hinged to the slider 254. The motion of the second linkage 253 transmits force to the slider 254, but this force is along the direction of the linkage, and the slider 254 is constrained in the sliding groove 260 and can only move linearly. Therefore, the swinging motion of the second linkage 253 is converted into the precise linear motion of the slider 254 in the sliding groove 260.
[0043] 4. Synchronous opposite motion and clamping: since the first linkage 252 is an integral component, its rotation will synchronously drive the left and right second linkages 253 and sliders 254. The designed linkage assembly ensures that the two sliders 254 always move simultaneously towards the center or simultaneously move away from the center. During clamping, they move towards each other. As the sliders 254 move towards the center, the clamping wheels 255 fixed thereon also move towards the center. Finally, the outer wall of the clamping wheels 255 gently contacts and compresses the two long edges of the touch screen from left and right.
[0044] 5. Center positioning and completion: since the mechanism is completely symmetrical and driven by the same motor, the two clamping wheels 255 move the same distance. Therefore, they will accurately push the geometric center of the touch screen to a position coinciding with the design center line of the mechanism, achieving automatic centering. The first motor 251 stops rotating when it reaches the preset clamping position or receives the preset torque signal, and the clamping process is completed. At this time, the short edge of the touch screen is limited by the first limiting groove 430 and the clamping plate 240, and the long edge is clamped by the two clamping wheels 255, and is accurately fixed in the predetermined position.
[0045] 6. Release: when the crimping process is completed, the control system instructs the first motor 251 to rotate in reverse, through the connecting rod assembly, to drive the two sliders 254 and the clamping wheels 255 to move away from each other, loosen the clamping of the touch screen, and return to the initial open state, facilitating the operator or automatic equipment to take away the finished product.
[0046] The center clamping assembly 250 is driven by the first motor 251, that is, the two clamping wheels 255 on both sides can be controlled synchronously to move towards or away from each other, the structure is compact, the motion synchronization is good, and the accuracy of the center is ensured. In addition, the clamping wheels 255 adopt rolling contact, which reduces the risk of scratching when rubbing against the long side of the touch screen.
[0047] It should be noted that the outer wall of the clamping wheel 255 is covered with a rubber ring 256, which further increases the friction and prevents slipping during clamping. In addition, the rubber material is soft, providing good cushioning and greatly reducing the risk of scratching or crushing the edge of the touch screen glass.
[0048] Please refer to Figure 1 , the circuit board clamping mechanism 300 is fixedly installed on the surface of the support plate 100, and the circuit board clamping mechanism 300 comprises a first base 310, an adjusting assembly 320 and a carrier 330. The adjusting assembly 320 is installed on the first base 310, and the carrier 330 is fixedly connected to the surface of the adjusting assembly 320. The surface of the carrier 330 has a positioning groove 340.
[0049] Specifically, please refer to Figure 4 and Figure 5 , the adjusting assembly 320 comprises a second motor 321 fixedly connected to the sidewall of the first base 310, the output end of the second motor 321 is fixedly connected with a ball screw 322, the outer wall of the ball screw 322 is connected with a first sliding table 323 through a nut seat, the surface of the first base 310 is fixedly connected with a first guide rail 324, the first sliding table 323 is slidingly connected with the first guide rail 324, the surface of the first sliding table 323 is slidingly connected with a second sliding table 325, a differential head 326 is connected between one side of the second sliding table 325 and the first base 310, a shock absorber 327 is fixedly connected between the other side of the second sliding table 325 and the first base 310, the second sliding table 325 is fixedly connected with the carrier 330, and the differential head 326 is perpendicular to the ball screw 322.
[0050] Among them, the second motor 321 is a servo motor or a stepping motor, the nut seat is slidingly connected with the first sliding table 323, and the nut seat is threadedly connected with the ball screw 322.
[0051] The specific working process of the adjusting assembly 320 is as follows: 1. Coarse adjustment in X-axis direction Start driving: the operator starts the second motor 321 through the control system.
[0052] Motion conversion: The second motor 321 rotates, driving the ball screw 322 fixedly connected therewith to rotate synchronously.
[0053] Linear motion: The rotational motion of the ball screw 322 is converted into precise linear motion by the nut seat thereon.
[0054] Overall movement: Since the first sliding table 323 is in sliding connection with the first guide rail 324, the entire first sliding table 323 and all components thereon will move smoothly along the X-axis direction.
[0055] The purpose of this step is to perform rough positioning of a large stroke. It quickly moves the stage 330 fixed with the flexible circuit board to the approximate area where the touch screen is located, so that the pads of the flexible circuit board are substantially aligned with the pins of the touch screen in the X direction, preparing for the fine adjustment that follows. The high precision of the ball screw pair ensures that even in the rough adjustment stage, the movement has good positioning accuracy and repeatability.
[0056] 2. Y-axis fine adjustment After the X-axis rough adjustment is completed, fine adjustment in the Y-axis direction is needed to ensure perfect alignment.
[0057] Operating the differential head 326: The operator slowly and finely rotates the differential head 326 using a tool such as a wrench. The differential head 326 is a displacement adjustment device with extremely high precision.
[0058] Push fine adjustment: One end of the top rod of the differential head 326 is pushed against the first base 310, and the other end is pushed against the first sliding table 323. Rotating the differential head 326 will cause its top rod to extend or retract.
[0059] Precise displacement: When the top rod extends, it will push the second sliding table 325 to move a very small distance along the Y-axis direction.
[0060] Final positioning: Since the stage 330 is fixed to the second sliding table 325, this small movement will be directly and without delay transmitted to the stage 330 and the flexible circuit board thereon. The operator observes the alignment of the FPC and the touch screen leads (with the aid of a microscope or a CCD vision system) and finely rotates the differential head 326 until they are completely coincident in the Y direction.
[0061] Shock absorber 327 action: During this process, the shock absorber 327 fixed on the other side not only provides a counteracting support force to balance the pushing force generated by the differential head 326, but more importantly, it can effectively absorb small vibrations from the outside and the device itself, preventing the precisely adjusted position from shifting due to vibrations, ensuring the stability of the adjustment process and the reliability of the final result.
[0062] The second motor 321 and the ball screw 322 provide large stroke and high precision coarse adjustment driving in the X-axis direction, facilitating the conveying of the flexible circuit board to the touch screen, and the micro head 326 provides extremely precise fine adjustment capability in the Y-axis direction, facilitating micron-level alignment adjustment, meeting the requirements of super-high precision crimping, and the shock absorber 327 effectively absorbs the vibration generated during the adjustment in the Y-axis direction, ensuring the position stability of the flexible circuit board and preventing alignment deviation caused by vibration. The structure realizes multi-stage precise adjustment combining electromechanical, and takes into account the adjustment efficiency and final precision.
[0063] It should be noted that the end of the carrier 330 close to the limiting auxiliary mechanism 400 has symmetrical limiting blocks 350, and the bottom of the limiting block 350 is fixedly connected with a rubber pad 360, and the bottom of the rubber pad 360 is attached to the surface of the touch screen.
[0064] When the flexible circuit board is placed in the positioning groove 340, in order to facilitate the subsequent crimping work, the gold finger terminal of the flexible circuit board needs to be exposed, at this time, the gold finger terminal of the flexible circuit board is not in contact with the carrier 330. When the flexible circuit board is initially placed, the limiting block 350 can play a role in positioning the position of the gold finger terminal of the flexible circuit board. In addition, when the gold finger terminal of the flexible circuit board is conveyed to the touch screen indium tin oxide pad area, the limiting block 350 is located at the edge of the touch screen indium tin oxide pad. At this time, the limiting block 350 can play a role in verifying whether the flexible circuit board is aligned with the touch screen, and at the same time, when the hot press is used for hot pressing, the limiting block 350 can prevent the anisotropic conductive adhesive from flowing out of the touch screen pad area, thereby improving the connection stability between the gold finger terminal of the flexible circuit board and the touch screen indium tin oxide pad.
[0065] Please refer to Figure 6 and Figure 7 , the limiting auxiliary mechanism 400 is located between the touch screen clamping mechanism 200 and the circuit board clamping mechanism 300, and the limiting auxiliary mechanism 400 includes a second base 410 and a limiting plate 420, the second base 410 is fixedly connected to the surface of the supporting plate 100, and the limiting plate 420 is fixedly connected to the upper end of the second base 410. The surface of the limiting plate 420 has a first limiting groove 430 close to one side of the touch screen clamping mechanism 200, and the surface of the limiting plate 420 has a second limiting groove 440 close to one side of the circuit board clamping mechanism 300.
[0066] Please refer to Figure 6 , Figure 7 and Figure 8 , the first limiting groove 430 and the second limiting groove 440 are both L-shaped grooves, and the inner bottom wall of the second limiting groove 440 is in sliding connection with the bottom of the carrier 330, facilitating the conveying of the gold finger terminal of the flexible circuit board on the carrier 330 to the upper side of the touch screen indium tin oxide pad area.
[0067] wherein, referring to Figure 6 , the surface of the limiting plate 420 is further provided with a groove 450, the inner wall of the groove 450 is located on the same plane as the outer wall of the limiting plate 420 on the same side, and when the gold finger terminal of the flexible circuit board on the carrier 330 is transported to the upper side of the indium tin oxide pad area of the touch screen, the limiting plate 420 can play a role in verifying whether the center of the carrier 330 is aligned with the center of the support table 220.
[0068] It should be noted that the clamping plate 240 and the limiting plate 420 are in abutment with the short side of the touch screen, and the limiting plate 420 cooperates with the clamping plate 240 to play a role in clamping and fixing the short side of the touch screen. In addition, when the gold finger terminal of the flexible circuit board on the carrier 330 is transported to the upper side of the indium tin oxide pad area of the touch screen, the limiting plate 420 can play a role in limiting the movement range of the carrier 330, and can prevent the end of the carrier 330 from directly contacting the end of the touch screen glass, thereby reducing the risk of damaging the edge of the touch screen glass.
[0069] Please refer to Figure 9 and Figure 10 , the vacuum control mechanism 500 is fixedly installed on the support plate 100, the carrier 330 is provided with a vacuum chamber 301, the working surface of the carrier 330 is provided with a first micro-hole array 302 in communication with the vacuum chamber 301, and the vacuum control mechanism 500 is used for inputting negative pressure vacuum or positive pressure gas into the vacuum chamber 301.
[0070] Specifically, please refer to Figure 10 and Figure 11 , the vacuum control mechanism 500 includes a vacuum generating unit 510, an air path integrated block 520, a positive pressure generating unit 530, and an air path switching valve 540, the positive pressure generating unit 530 is used for adjusting the pressure and flow of the output positive pressure gas, the air path integrated block 520 has a first air path 521 and a second air path 522 which are independent of each other inside, the first air path 521 is connected with the vacuum generating unit 510, the second air path 522 is connected with the positive pressure generating unit 530, the air path integrated block 520 is provided with a working interface 523, and the air path switching valve 540 is fixedly installed in the air path integrated block 520. The air path switching valve 540 is used for controlling the working interface 523 to communicate with the first air path 521 or the second air path 522, and the working interface 523 is connected with the vacuum chamber 301 through a pipeline.
[0071] It should be noted that the vacuum generating unit 510 is a Venturi vacuum generator, the input port of the vacuum generating unit 510 is connected to a compressed air source which has a stable pressure and is filtered, the positive pressure generating unit 530 is a proportional valve or a pressure regulating valve, and the air path switching valve 540 is a three-position five-way double-electric-control electromagnetic valve. In addition, please refer to Figure 9 ,Figure 10 and Figure 11 The second micropore array 303 is located at one end of the carrier 330 close to the limiting auxiliary mechanism 400, each hole in the second micropore array 303 is an inclined hole, the vacuum chamber 301 is divided into two sub-chambers in gas-tight isolation by the built-in sealing partition wall 304, one of the sub-chambers is in communication with the first micropore array 302, and the other sub-chamber is in communication with the second micropore array 303, the second micropore array 303 is located between the adjacent limiting blocks 350, each sub-chamber is connected with one working interface 523 on the gas circuit integration block 520 through an independent sub-pipe, and the working interface 523 is two in total, and an electromagnetic valve 550 is fixedly installed on each sub-pipe.
[0072] It should be noted that the vacuum control mechanism 500 further comprises a controller, the controller is electrically connected with the vacuum generating unit 510, the positive air pressure generating unit 530, the gas circuit switching valve 540 and the electromagnetic valve 550, and the controller is used for controlling start and stop and switching.
[0073] The specific working process of the vacuum control mechanism 500 is as follows: 1. Mode one: vacuum adsorption fixing process (crimping preparation stage) This mode is used to firmly and flatly adsorb and fix the flexible circuit board in the positioning groove 340 of the carrier 330 before crimping.
[0074] Instruction issuing: when the operator puts the flexible circuit board into the positioning groove 340, the controller issues an "adsorption" instruction.
[0075] Gas circuit switching: after receiving the signal, the gas circuit switching valve 540 acts to switch to a position in which the first working interface 523 is in communication with the first gas circuit 521, and at the same time, the electromagnetic valve 550 of the corresponding sub-chamber of the first micropore array 302 is opened.
[0076] Vacuum generation: the vacuum generating unit 510 starts to work, and compressed air passes through the generator to generate strong adsorption force at the vacuum port thereof according to the Venturi effect.
[0077] Negative pressure establishment: the generated vacuum negative pressure reaches the sub-chamber in communication with the first micropore array 302 on the carrier 330 through the first gas circuit 521, the gas circuit switching valve 540, the first working interface 523 and the connecting pipe.
[0078] Workpiece adsorption: the air in the sub-chamber in communication with the first micropore array 302 is quickly sucked away to form a negative pressure, the negative pressure acts on the entire back surface of the flexible circuit board through the first micropore array 302 to generate uniform and strong adsorption force, and the soft flexible circuit board is tightly and flatly adsorbed on the working surface of the carrier 330 to perfectly overcome the problems of easy warping and displacement.
[0079] Hold state: The vacuum state is maintained until the pressure bonding process is completed.
[0080] Mode one uses uniform negative pressure adsorption to replace the traditional mechanical clamping, completely avoiding physical damage to the surface of the flexible circuit board, ensuring that the flexible circuit board is absolutely flat during the entire pressure bonding process, and ensuring the pressure bonding quality.
[0081] 2. Mode two: second micro-pore array 303 adsorption guidance (during pressure bonding) Because a small piece of anisotropic conductive adhesive tape is preliminarily attached to the indium tin oxide pad area of the glass edge of the touch screen before pressure bonding, when the flexible circuit board is moved directly above the touch screen, the gold finger terminal of the flexible circuit board does not contact the indium tin oxide pad area of the touch screen, and during pressure bonding, the gold finger terminal of the flexible circuit board is directly pressure-bonded to the indium tin oxide pad area of the touch screen. Therefore, this mode is used to move the gold finger terminal of the flexible circuit board downward in the direction of the indium tin oxide pad area of the touch screen after fixation, before starting pressure bonding, to assist in pressure bonding.
[0082] Instruction issuance: When the operator moves the gold finger terminal of the flexible circuit board directly above the indium tin oxide pad area of the touch screen, the controller issues an "adsorption" instruction.
[0083] Air path switching: After receiving the signal, the air path switching valve 540 acts to switch to a position that allows the second working interface 523 to communicate with the first air path 521, and at the same time, the electromagnetic valve 550 corresponding to the sub-chamber of the second micro-pore array 303 is opened.
[0084] Vacuum generation: The vacuum generation unit 510 starts to work, and compressed air passes through the generator to generate strong adsorption force at the vacuum port thereof according to the Venturi effect.
[0085] Negative pressure establishment: The generated vacuum negative pressure passes through the first air path 521, the air path switching valve 540, the second working interface 523, the connecting pipeline, and finally reaches the sub-chamber on the stage 330 that communicates with the second micro-pore array 303.
[0086] Hold state: The vacuum state is maintained until the pressure bonding process is completed.
[0087] Mode two uses uniform negative pressure guidance to move the gold finger terminal of the flexible circuit board downward in the direction of the indium tin oxide pad area of the touch screen, to assist in pressure bonding.
[0088] 3. Mode three: positive pressure blowing demolding process (after pressure bonding is completed) This mode is used to safely blow the flexible circuit board away from the stage 330 after hot pressure bonding is completed, to realize automatic demolding.
[0089] Instruction issuing: after the crimping cycle ends and the hot press head rises, the controller issues a "demolding" instruction.
[0090] Gas path switching: the gas path switching valve 540 receives a signal and moves to a position that allows both working interfaces 523 to communicate with the second gas path 522. At the same time, the electromagnetic valve 550 controlling each sub-chamber is closed.
[0091] Positive pressure generation: the positive air pressure generation unit 530 starts working, accurately adjusting the output pressure and flow of compressed air to output a soft and controllable positive pressure gas.
[0092] Positive pressure injection: the adjusted positive pressure gas passes through the second gas path 522, the gas path switching valve 540, and the working interface 523 connecting pipeline to be injected into the vacuum chamber 301 in reverse.
[0093] Blowing away the workpiece: the positive pressure gas uniformly blows out from the vacuum chamber 301 through the first micro-pore array 302 and the second micro-pore array 303, forming an air cushion between the flexible circuit board and the working surface of the carrier 330, effectively overcoming the vacuum adsorption force, electrostatic force, and possible trace adhesion, smoothly lifting and blowing the flexible circuit board away from the carrier 330.
[0094] Component removal: the operator or automated equipment can easily remove the crimped assembly.
[0095] Non-contact air blowing demolding completely avoids the risks of bending, deformation, and solder damage of the flexible circuit board that may be caused by traditional manual peeling, realizes automation of the process after crimping, greatly improves the production rhythm, and reduces manual intervention.
[0096] In addition, please refer to Figure 1 , the bottom of the support plate 100 is also provided with a conveying mechanism 600, the conveying mechanism 600 includes a second guide rail 610 and a gas cylinder 620, the second guide rail 610 and the gas cylinder 620 are both fixed on the working surface of the hot press, the support plate 100 is slidingly connected to the surface of the second guide rail 610, and the output end of the gas cylinder 620 is fixedly connected with the support plate 100.
[0097] It should be noted that the working surface of the hot press is also provided with two displacement sensors (not labeled in the figure), which are electrically connected with the gas cylinder 620 to limit the movement distance of the support plate 100.
[0098] The conveying mechanism 600 at the bottom of the support plate 100 realizes the automatic entry and exit of the entire jig in the hot press, facilitates the integration of the jig into the automatic production line, eliminates the need for manual pushing and pulling, and greatly improves the production rhythm and automation level.
[0099] The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.
Claims
1. A touch panel flexible wiring board crimping jig characterized by comprising: The utility model relates to a kind of touch screen clamping mechanism and line board clamping mechanism, including: Supporting plate (100) is arranged on the workbench surface of hot press; Touch screen clamping mechanism (200) is fixedly installed on the surface of the supporting plate (100); Line board clamping mechanism (300) is fixedly installed on the surface of the supporting plate (100), and includes first base (310), adjusting assembly (320) and stage (330), the adjusting assembly (320) is installed on first base (310), the stage (330) is fixedly connected on the surface of adjusting assembly (320), and the surface of the stage (330) has locating groove (340); Limiting auxiliary mechanism (400) is located between touch screen clamping mechanism (200) and line board clamping mechanism (300), and includes second base (410) and limiting plate (420), the second base (410) is fixedly connected on the surface of supporting plate (100), the limiting plate (420) is fixedly connected on the upper end of second base (410), the surface of the limiting plate (420) is close to the side of touch screen clamping mechanism (200) with first limiting slot (430), the surface of the limiting plate (420) is close to the side of line board clamping mechanism (300) with second limiting slot (440); Wherein, vacuum control mechanism (500) is also installed on the supporting plate (100), vacuum chamber (301) is opened in the stage (330), and the working surface of the stage (330) is provided with first micropore array (302) in communication with vacuum chamber (301), and the vacuum control mechanism (500) is used to input negative pressure vacuum or positive pressure gas to vacuum chamber (301).
2. The touch panel flexible wiring board crimping jig according to claim 1, wherein The touch screen clamping mechanism (200) includes a support seat (210) fixedly installed on the surface of the supporting plate (100), the surface of the support seat (210) is fixedly connected with a support table (220), the surface of the support table (220) is provided with a clamping groove (230), and the surface of the support table (220) is detachably connected with a clamping plate (240), the clamping plate (240) and the limiting plate (420) are in contact with the short side of the touch screen, and a center clamping assembly (250) is installed on the support seat (210), the center clamping assembly (250) is used for clamping the long side of the touch screen and fixing the touch screen in the center.
3. The touch panel flexible wiring board crimping jig according to claim 2, characterized by The center clamping assembly (250) includes a first motor (251), the output end of the first motor (251) is fixedly connected with a first connecting rod (252), the two ends of the first connecting rod (252) are hingedly connected with a second connecting rod (253), the free end surface of the second connecting rod (253) is hingedly connected with a sliding block (254), the surface of the sliding block (254) is rotatably connected with a clamping wheel (255), the outer wall of the clamping wheel (255) is in contact with the long side of the clamping touch screen, and the surface of the support table (220) is provided with a sliding groove (260), and the sliding block (254) is slidingly connected in the sliding groove (260).
4. The touch panel flexible wiring board crimping jig according to claim 3, characterized by The outer wall of the clamping wheel (255) is covered with a rubber ring (256).
5. The crimping jig for a touch panel flexible wiring board according to claim 1, wherein The adjusting assembly (320) comprises a second motor (321) fixed to the sidewall of the first base (310), the output end of the second motor (321) is fixedly connected with a ball screw (322), the outer wall of the ball screw (322) is connected with a first sliding table (323) through a nut seat, the surface of the first base (310) is fixedly connected with a first guide rail (324), the first sliding table (323) is slidably connected with the first guide rail (324), the surface of the first sliding table (323) is slidably connected with a second sliding table (325), one side of the second sliding table (325) and the first base (310) are connected with a differential head (326), the other side of the second sliding table (325) and the first base (310) are fixedly connected with a shock absorber (327), the second sliding table (325) is fixedly connected with a carrier (330), and the differential head (326) and the ball screw (322) are perpendicular to each other.
6. The touch panel flexible wiring board crimping jig according to claim 5, wherein The carrier (330) is provided with symmetrical limiting blocks (350) at one end close to the limiting auxiliary mechanism (400), the bottom of the limiting block (350) is fixedly connected with a rubber pad (360), and the bottom of the rubber pad (360) is attached to the surface of the touch screen.
7. The touch panel flexible wiring board crimping jig according to claim 6, wherein The bottom of the supporting plate (100) is provided with a conveying mechanism (600), the conveying mechanism (600) comprises a second guide rail (610) and a gas cylinder (620), the second guide rail (610) and the gas cylinder (620) are fixed on the workbench surface of the hot press, the supporting plate (100) is slidably connected to the surface of the second guide rail (610), and the output end of the gas cylinder (620) is fixedly connected with the supporting plate (100).
8. The crimping jig for a touch panel flexible wiring board according to any one of claims 1 to 7, wherein The vacuum control mechanism (500) comprises a vacuum generating unit (510), an air path integrated block (520), a positive air pressure generating unit (530) and an air path switching valve (540), the positive air pressure generating unit (530) is used for adjusting the pressure and flow of output positive pressure gas, the air path integrated block (520) has a first air path (521) and a second air path (522) which are independent of each other in the inside, the first air path (521) is connected with the vacuum generating unit (510), the second air path (522) is connected with the positive air pressure generating unit (530), the air path integrated block (520) is provided with a working interface (523), the air path switching valve (540) is fixedly installed in the air path integrated block (520), the air path switching valve (540) is used for controlling the working interface (523) to communicate with the first air path (521) or the second air path (522), and the working interface (523) is connected with the vacuum chamber (301) through a pipeline.
9. The touch panel flexible wiring board crimping jig according to claim 8, wherein The vacuum generating unit (510) is a Venturi vacuum generator, and the positive air pressure generating unit (530) is a proportional valve or a pressure regulating valve.
10. The touch panel flexible wiring board crimping jig according to claim 8, wherein The carrier (330) has a second micropore array (303) near one end of the limiting auxiliary mechanism (400), each hole in the second micropore array (303) is an inclined hole, the vacuum chamber (301) is divided into two sub-chambers in gas-tight isolation by a built-in sealing partition wall (304), one of the sub-chambers is in communication with the first micropore array (302), and the other sub-chamber is in communication with the second micropore array (303), the second micropore array (303) is located between adjacent limiting blocks (350), each sub-chamber is connected with a working interface (523) on the gas path integrated block (520) through an independent sub-pipe, and an electromagnetic valve (550) is fixedly installed on each sub-pipe.