PFC bending equipment for fingerprint module production

Abstract

The present application relates to the technical field of soft circuit board processing, in particular to a PFC bending equipment for fingerprint module production, which is used for bending soft circuit boards, comprising a feeding conveying line, a limiting piece, a bending rod, a bending carrying assembly and a discharging conveying line. Compared with the traditional method, the technical scheme transports the limiting piece and the soft circuit board through the feeding conveying line and the discharging conveying line, and the conveying efficiency is high. The bending carrying assembly and the bending rod are arranged between the feeding conveying line and the discharging conveying line. The part of the soft circuit board extending out of the limiting piece is bent through the cooperation of the bending swing block and the bending rod. After bending, the soft circuit board that has completed bending is adsorbed and fixed by the adsorption assembly and carried to the discharging conveying line. The whole process has high automation degree, the overall bending steps are smooth and natural, and the bending efficiency is high. The limiting piece is provided with a heating coil, and the soft circuit board is heated by the heating coil.

Description

Technical Field

[0001] This invention relates to the field of flexible printed circuit board (FPCB) processing technology, specifically to a PFC bending device for fingerprint module production. Background Technology

[0002] Currently, fingerprint modules are commonly used in the electronics field, such as in fingerprint locks, mobile phones, and computers. The components of a fingerprint module are generally integrated onto an FPC (Flexible Printed Circuit) board. FPC boards are characterized by their space-saving, lightweight, and high flexibility; they can be shaped to fit space constraints. However, in fingerprint module manufacturing, certain areas of the flexible circuit board need to be bent to meet the assembly requirements of electronic products.

[0003] Patent document CN107911946B discloses a bending and straightening device for fingerprint module FPC flexible circuit boards, including a jig plate, a stamping and bending assembly, a bending adjustment assembly, a pressing assembly, and a clamping assembly. The jig plate is fixedly mounted on the bending adjustment assembly and is used to place the FPC flexible circuit board to be bent. The stamping and bending assembly, the pressing assembly, and the clamping assembly are all located above the bending adjustment assembly. The stamping and bending assembly includes a bending head and a magnet mounting block. The bending head is used to bend the bent FPC flexible circuit board, and the magnet mounting block contains a magnet that attracts and pulls the bent FPC flexible circuit board. The beneficial effects of this invention are: eliminating the internal stress of the FPC flexible circuit board, avoiding bending after bending, and improving the bending effect of the FPC flexible circuit board.

[0004] Patent document CN216502055U discloses a preheating bending device, comprising a turntable mounted on a frame and sequentially arranged along the rotation direction of the turntable, a loading / unloading station, a first preheating device, a first bending device, a second preheating device, and a second bending device. The loading / unloading station is used for loading or unloading workpieces. The first preheating device blows hot air to the first bending position of the workpiece, and the first bending device is used to press and bend the first bending position. The second preheating device blows hot air to the second bending position of the workpiece, and a third hot air mechanism blows hot air to the third bending position of the workpiece. The second bending device is used to bend the second and third bending positions. This preheating bending device can automatically preheat and bend multiple parts of a mobile phone flex cable.

[0005] In the aforementioned bending solutions for flexible printed circuit boards (FPCs), Patent Document 1 uses the reciprocating movement of a magnetic mounting block to pull the FPC, thereby eliminating internal stress and preventing bending deformation after bending. However, this reciprocating bending action can cause material fatigue, reducing bending strength and durability, which affects product quality. Patent Document 2, which preheats the mobile phone cable before bending, reduces stress during the bending process. However, this preheating is not standard preheating; it occurs only briefly before the workpiece enters the turntable for bending, resulting in insufficient preheating time and affecting the bending effect. Summary of the Invention

[0006] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a PFC bending equipment for fingerprint module production, which solves the problems of low bending efficiency, easy bending deformation of the circuit board after bending, and poor bending effect when bending flexible circuit boards.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A PFC bending device for fingerprint module production is used to bend flexible circuit boards. It includes a feeding conveyor line, a limiting component, a bending rod, a bending conveying assembly, and an unloading conveyor line. The limiting component is used to heat and constrain the flexible circuit board to be bent, wherein the portion of the flexible circuit board to be bent extends beyond the limiting component. The feeding conveyor line transports the limiting component and the flexible circuit board to the unloading conveyor line. The bending rod and the bending conveying assembly are arranged at the conveying junction of the feeding and unloading conveyors. The bending conveying assembly includes a bending swing block and an adsorption assembly that perform sequential, spaced circular motions under driving force. The bending swing block cooperates with the bending rod to bend the portion of the flexible circuit board extending beyond the limiting component. The adsorption assembly contacts the unbent portion of the flexible circuit board and forms a negative pressure area at the contact point to adsorb the flexible circuit board until it is transported to the unloading conveyor line.

[0009] Furthermore, the feeding conveyor line includes a horizontal conveying section and an inclined conveying section, with a conveyor belt rolling between the two;

[0010] The inclined conveyor section is located near the unloading conveyor line. The inclined conveyor section includes a lower base frame and an upper support frame, which are rotatably connected.

[0011] Furthermore, a positioning plate and multiple arc-shaped plates are provided between the support frame and the base frame. The positioning plate is located at the end of the support frame and the base frame. The bottom of the positioning plate is fixed to the base frame, and the top of the positioning plate is rotatably connected to the support frame through a pivot pin.

[0012] Using the pivot pin as the center of rotation for the support frame and base frame, multiple arc-shaped plates are arranged on the rotation radius of the support frame and base frame according to their different arc lengths. The bottom of the arc-shaped plates is fixed to the base frame. The body of the arc-shaped plates has an arc-shaped groove. Screws are threaded to the two sides of the support frame corresponding to the positions of the arc-shaped grooves. One end of the screw passes through the arc-shaped groove. Depending on the angle between the support frame and the base frame, the screw slides in the arc-shaped groove. After rotating and tightening the screw, the screw, the arc-shaped plate, and the support frame are fixed together, and the angle between the support frame and the base frame is determined.

[0013] Furthermore, an adjustment component is provided at one end of the inclined conveyor section near the unloading conveyor line. The adjustment component is used to install and adjust the relative position between the bending bar and the flexible circuit board to be bent.

[0014] The adjustment assembly includes side plates respectively disposed on both sides of the support frame. The side of the support frame has multiple sets of positioning holes from top to bottom, and the side plates have multiple sets of mounting slots from top to bottom. When any set of mounting slots coincides with the positioning holes, a bolt can be inserted and tightened to connect the side plate to the support frame.

[0015] One end of the side plate is connected to the support frame as the beginning end, and the other end of the side plate is the end end. A slope is formed between the beginning end and the end end of the side plate. Multiple U-shaped grooves are opened on the side plate body corresponding to the beginning end and the end end. Depending on the bending angle of the flexible circuit board to be bent, the two ends of the bending rod are respectively inserted into the corresponding U-shaped grooves.

[0016] Furthermore, the bending and conveying assembly is disposed between the inclined conveying section and the unloading conveying line, and a hydrostatic guide rail is provided at the bottom of the bending and conveying assembly;

[0017] The hydrostatic guide rail includes a guide rail body and a slider. The slider is slidably connected to the guide rail body. As the slider moves along the guide rail body, it drives the bending and conveying assembly to move synchronously. A base plate is provided at the bottom of the guide rail body. The base plate is connected and fixed to the inclined conveyor and the unloading conveyor line respectively through mounting brackets on both sides.

[0018] Furthermore, the limiting member includes a base plate, the top of the base plate is provided with a mounting groove, the mounting groove is provided with at least one guide opening for inserting the flexible circuit board to be bent, and two clamping plates are slidably arranged in the mounting groove with respect to the flexible circuit board.

[0019] A heating coil is provided on the bottom surface of the mounting slot at the position corresponding to the limiting constraint of the flexible circuit board. The heating coil is used to preheat the flexible circuit board to be bent before bending.

[0020] The bottom surface of the mounting slot is provided with a positioning groove, the opening direction of the positioning groove is perpendicular to the sliding direction of the clamping plate, a fixed round rod is provided in the positioning groove, and a return spring is sleeved on the rod body of the fixed round rod. The two ends of the return spring are respectively fixedly connected to the two clamping plates.

[0021] The clamp has an L-shaped structure consisting of a vertical part and a horizontal part. A fixing part is provided at the bottom of the vertical part corresponding to the positioning groove. The fixing part is slidably sleeved with the fixing rod. Rollers are provided at the positions where the inner wall of the vertical part contacts the two sides of the flexible circuit board. The rollers are in rolling connection with the flexible circuit board.

[0022] Furthermore, a fixing post is provided at the center position between the two clamping plates on the base plate. A guide groove is provided on the side of the fixing post facing the guide opening. A guide post is vertically arranged in the guide groove. A lifting spring is sleeved on the body of the guide post. A pressure plate is slidably sleeved on the guide post. A connecting plate is provided between the pressure plate and the clamping plates on both sides. The two ends of the connecting plate are rotatably connected to the pressure plate and the clamping plate, respectively.

[0023] Furthermore, the bending and conveying assembly includes a base, a hexagonal rotary drum, a conveying motor, and two upright plates. The bottoms of the two upright plates are fixedly connected to the base. The hexagonal rotary drum is rotatably disposed between the tops of the two upright plates. The conveying motor uses one of the upright plates as its assembly base, and the output end of the conveying motor passes through the upright plate and is connected to the hexagonal rotary drum.

[0024] Each of the six end faces of the hexagonal rotating cylinder is detachably connected to a mounting base, wherein at least one of the mounting bases is connected to the bending swing block via a connecting rod, and at least one mounting base is provided with the adsorption component.

[0025] Furthermore, the bending swing block has a long and curved main body structure, with the bending direction of the main body structure facing inward, and the two ends of the main body structure are respectively sharp and blunt rounded.

[0026] Furthermore, the adsorption assembly includes a cylinder, a fixed plate, and an adsorption element. The cylinder is fixedly connected to the mounting base, and the output end of the cylinder is connected to one end of the fixed plate. The fixed plate has multiple strip-shaped through holes, and the adsorption element is inserted into the strip-shaped through holes.

[0027] The adsorption component includes a hollow tube with a through-hole, the top of the hollow tube extending upward and forming an adsorption port that adsorbs onto the surface of the flexible circuit board, and the bottom of the hollow tube is connected to a vacuum pump via a flexible tube.

[0028] The beneficial effects of this invention are:

[0029] Compared to traditional methods, this technical solution utilizes loading and unloading conveyor lines to transport the limiting components and flexible circuit boards, resulting in high conveying efficiency. A bending and handling assembly and bending rod are installed between the loading and unloading conveyor lines. The bending swing block and bending rod work together to bend the portion of the flexible circuit board extending beyond the limiting component. After bending, an adsorption assembly is used to hold the bent flexible circuit board in place and transport it to the unloading conveyor line. The entire process is highly automated, with smooth and natural bending steps and high bending efficiency. Furthermore, a heating coil is installed on the limiting component to heat the flexible circuit board for a longer duration, which helps reduce stress during subsequent bending processes, thereby optimizing the bending effect. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is a perspective view of the present invention;

[0032] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0033] Figure 3 This is a side view of the present invention;

[0034] Figure 4 This is a stereoscopic view of the inclined conveyor line in this invention. Figure 1 ;

[0035] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0036] Figure 6 yes Figure 4 A magnified view of a section at point C;

[0037] Figure 7 This is a stereoscopic view of the inclined conveyor line in this invention. Figure 2 ;

[0038] Figure 8 yes Figure 7 A magnified view of a section at point D;

[0039] Figure 9 This is a perspective view of the bending rod and adjusting assembly in this invention;

[0040] Figure 10 A perspective view of the limiting component and the flexible circuit board in this invention;

[0041] Figure 11 A perspective view of the limiting component in this invention;

[0042] Figure 12A perspective view of the clamping plate in this invention;

[0043] Figure 13 A perspective view of another embodiment of the limiting member in this invention;

[0044] Figure 14 A perspective view of the bending and conveying assembly and the hydrostatic guide rail in this invention;

[0045] Figure 15 A perspective view of the hexagonal rotating cylinder, the bending swing block, and the adsorption assembly in this invention;

[0046] Figure 16 A perspective view of the fixing plate and the adsorption component in this invention.

[0047] In the diagram: 1. Feeding conveyor line; 11. Horizontal conveyor section; 12. Inclined conveyor section; 121. Base frame; 122. Support frame; 1221. Trough; 1222. Positioning hole; 123. Drive component; 124. Positioning plate; 1241. Shaft pin; 125. Arc plate; 1251. Arc groove; 1252. Screw; 13. Conveyor belt; 14. Sensor; 15. Limiting bar; 2. Limiting component; 21. Base plate; 22. Mounting groove; 23. Positioning groove; 24. Fixed round rod; 25. Return spring; 26. Clamping plate; 261. Vertical part; 262. Horizontal part; 263. Fixed part; 264. Roller; 27. Heating coil; 28. Guide port; 29. ​​Fixed column; 291. Guide groove; 29 2. Guide column; 293. Pressure plate; 294. Lifting spring; 295. Connecting plate; 3. Flexible circuit board; 4. Bending bar; 41. Nut 1; 5. Bending and handling assembly; 51. Base; 52. Vertical plate; 53. Hexagonal rotary cylinder; 531. Mounting seat; 532. Connecting rod; 54. Bending swing block; 55. Adsorption assembly; 551. Cylinder; 552. Fixing plate; 5521. Strip through hole; 553. Adsorption component; 5531. Hollow tube; 5532. Nut 2; 5533. Corrugated rubber cover; 56. Handling motor; 6. Unloading conveyor line; 7. Adjustment assembly; 71. Side plate; 72. Mounting through groove; 73. U-shaped groove; 8. Guide rail body; 81. Slider; 82. Base plate; 83. Mounting bracket. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] Figure 1 , Figure 3A perspective view and a side view of a PFC bending device for fingerprint module production are shown. This PFC bending device is used to bend a flexible circuit board 3 and includes a feeding conveyor line 1, a limiting member 2, a bending rod 4, a bending conveying assembly 5, and an unloading conveyor line 6. The limiting member 2 is used to heat and constrain the flexible circuit board 3 to be bent, wherein the portion of the flexible circuit board 3 to be bent extends out of the limiting member 2. The feeding conveyor line 1 is used to convey the limiting member 2 and the flexible circuit board 3 to the unloading conveyor line 6. The conveying docking point of the material conveying line 6 is provided with a bending bar 4 and a bending and conveying assembly 5; the bending and conveying assembly 5 includes a bending swing block 54 that performs circular motion in sequence at intervals due to the driving force and an adsorption assembly 55. The bending swing block 54 cooperates with the bending bar 4 to bend the part of the flexible circuit board 3 that extends out of the limiting member 2; while the adsorption assembly 55 contacts the unbent part of the flexible circuit board 3 and forms a negative pressure area at the contact position to adsorb the flexible circuit board 3 until the flexible circuit board 3 is transported to the unloading conveying line 6.

[0050] During operation, the PFC bending equipment transports the limiting component 2 and the flexible circuit board 3 via the feeding conveyor line 1 and the unloading conveyor line 6, achieving high conveying efficiency. A bending transport assembly 5 and a bending rod 4 are installed between the feeding conveyor line 1 and the unloading conveyor line 6. The bending swing block 54, in cooperation with the bending rod 4, bends the portion of the flexible circuit board 3 extending beyond the limiting component 2. After bending, the adsorption assembly 55 adsorbs and fixes the bent flexible circuit board 3, then transports it to the unloading conveyor line 6. The entire process is highly automated, with smooth and natural bending steps and high bending efficiency. Furthermore, a heating coil 27 is installed on the limiting component 2 to heat the flexible circuit board 3. The heating time is longer, and the temperature is more uniform, which helps reduce stress during subsequent bending processes, thereby optimizing the bending effect.

[0051] As an example, such as Figure 10 , Figure 11 As shown, the limiting component 2 includes a base plate 21. A mounting groove 22 is formed on the top of the base plate 21. The mounting groove 22 has at least one guide opening 28 for inserting a flexible circuit board 3 to be bent. Two clamping plates 26 are slidably arranged in the mounting groove 22 about the flexible circuit board 3 in a mirror image. A heating coil 27 is provided on the bottom surface of the mounting groove 22 at a position corresponding to the limiting constraint of the flexible circuit board 3. The heating coil 27 is used to preheat the flexible circuit board 3 to be bent before bending. A positioning groove 23 is formed on the bottom surface of the mounting groove 22. The opening direction of the positioning groove 23 is perpendicular to the sliding direction of the clamping plates 26. A fixing rod 24 is provided in the positioning groove 23. A return spring 25 is sleeved on the body of the fixing rod 24. The two ends of the return spring 25 are respectively fixed to the two clamping plates 26. Figure 12As shown, the clamp 26 has an L-shaped structure consisting of a vertical part 261 and a horizontal part 262. A fixing part 263 is provided at the bottom of the vertical part 261 corresponding to the positioning groove 23. The fixing part 263 is slidably sleeved with the fixing rod 24. Rollers 264 are provided at the positions where the inner wall of the vertical part 261 contacts the two sides of the flexible circuit board 3. The rollers 264 are in rolling connection with the flexible circuit board 3. The rolling direction of the rollers 264 changes according to the direction of insertion or withdrawal of the flexible circuit board 3.

[0052] In this design, the substrate 21 is fixed to the surface of the conveyor belt 13. When the conveyor belt 13 rolls, the guide opening 28 always faces the direction of the unloading conveyor line 6. When installing the flexible circuit board 3 to be bent, the two clamping plates 26 are separated, and the part of the flexible circuit board 3 that does not need to be bent is inserted into the space between the two clamping plates 26 through the guide opening 28, ensuring that the part of the flexible circuit board 3 that needs to be bent extends out of the guide opening 28. After determining the position of the flexible circuit board 3, the two clamping plates 26 are released. Under the action of the return spring 25, the two clamping plates 26 move towards each other along the fixed round rod 24 until the rollers 264 on the two clamping plates 26 clamp the two sides of the flexible circuit board 3 respectively. At this time, the heating coil 27 can heat the flexible circuit board 3 to be bent. The heating time is determined according to the conveying length of the conveyor belt 13. In terms of its own structure, when the bending swing block 54 contacts the bending portion of the flexible circuit board 3, the flexible circuit board 3 will bend around the bending rod 4. It should be noted that the bending angle and bending position of the flexible circuit board 3 will vary depending on the distance between the bending rod 4 and the flexible circuit board 3, as well as the distance and angle between the flexible circuit board 3 and the bending swing block 54. The horizontal part 262 will limit and fix the flexible circuit board 3 vertically during bending to prevent the flexible circuit board 3 from detaching from the limiting part 2. After bending is completed, the adsorption component 55 will adsorb the unbent horizontal part of the flexible circuit board 3 and pull the flexible circuit board 3 out from between the two clamping plates 26 along the direction of the guide port 28. During the extraction of the flexible circuit board 3, the roller 264 rolls along with it, making the extraction process smoother and avoiding damage to the flexible circuit board 3.

[0053] As a further refinement of the above technical solution, such as Figure 10 , Figure 11 As shown, the guide opening 28 has a chamfered surface. The chamfered surface facilitates the insertion of the flexible circuit board 3 and serves to guide the insertion of the flexible circuit board 3.

[0054] As an example, such as Figure 13As shown, a fixing post 29 is provided at the center position between the two clamping plates 26 on the base plate 21. A guide groove 291 is provided on the side of the fixing post 29 facing the guide opening 28. A guide post 292 is vertically arranged in the guide groove 291. A lifting spring 294 is sleeved on the body of the guide post 292. A pressure plate 293 is slidably sleeved on the guide post 292. A connecting plate 295 is provided between the pressure plate 293 and the clamping plates 26 on both sides. The two ends of the connecting plate 295 are rotatably connected to the pressure plate 293 and the clamping plate 26 respectively.

[0055] With the above structural design, it is easier to install the flexible circuit board 3 that needs to be bent. By pressing down on the pressure plate 293, the lifting spring 294 retracts, the pressure plate 293 moves downward along the guide post 292, the included angle between the connecting plates 295 increases, the two clamping plates 26 separate under the push of the connecting plates 295, and the return spring 25 is stretched. At this time, the part of the flexible circuit board 3 that does not need to be bent can be inserted into the space between the two clamping plates 26 along the guide opening 28. Then, the pressure plate 293 is released, and the pressure plate 293 returns to its original position under the action of the lifting spring 294. The clamping plates 26 on both sides also clamp the flexible circuit board 3 under the action of the return spring 25. The installation of the flexible circuit board 3 is simple and convenient.

[0056] As an example, such as Figure 1 , Figure 3 As shown, the feeding conveyor line 1 includes a horizontal conveying section 11 and an inclined conveying section 12, with the inclined conveying section 12 tilted upwards. The lower end of the inclined conveying section 12 is connected to the horizontal conveying section 11, and the higher end of the inclined conveying section 12 is close to the end of the unloading conveyor line 6. A conveyor belt 13 is rolled between the horizontal conveying section 11 and the inclined conveying section 12. Multiple limiting members 2 are fixed at intervals on the surface of the conveyor belt 13. During the rolling of the conveyor belt 13, the multiple limiting members 2 are driven to move synchronously. Multiple sensors 14 are arranged at intervals on both sides of the horizontal conveying section 11 and the inclined conveying section 12 along the conveying direction of the conveyor belt 13. The sensors 14 monitor the position of the limiting members 2 on the horizontal conveying section 11 and the inclined conveying section 12, which facilitates the coordination with the bending and handling assembly 5 and achieves a bending process with higher precision.

[0057] As a further refinement of the above technical solution, such as Figure 4 As shown, the inclined conveyor 12 includes a lower base frame 121 and an upper support frame 122, which are rotatably connected, and the included angle between the support frame 122 and the base frame 121 is less than 90°.

[0058] As a further refinement of the above technical solution, such as Figure 4As shown, the support frame 122 includes drive members 123 disposed at both ends thereon. The drive members 123 are used to drive the conveyor belt 13 to rotate cyclically. The structure of the drive members 123 varies depending on the structure of the conveyor belt 13. When the conveyor belt 13 is a belt, the drive members 123 drive the rotating rollers to rotate using a drive motor. After the rotating rollers located inside the conveyor belt 13 tighten the conveyor belt 13, the rotating rollers rotate, and the conveyor belt 13 rolls accordingly. When the conveyor belt 13 is a chain conveyor belt, the drive members 123 drive the chain to roll using a drive motor. The chain is usually composed of metal links with plates fixed on them. The links are connected by pins. The plates are usually made of metal or plastic, and there are usually gaps between the plates. When the chain is driven by the drive motor, the chain and the plates connected to the chain move together. The plates on the chain roll on the horizontal conveying section 11 and the inclined conveying section 12, conveying the limiting member 2 and the flexible circuit board 3 to be bent along the conveyor line direction.

[0059] As a further refinement of the above technical solution, such as Figure 1 , Figure 2 As shown, when the conveyor belt 13 is a belt, a limit bar 15 is provided at the position of the connection between the horizontal conveying section 11 and the inclined conveying section 12. The limit bar 15 is used to restrict and constrain the conveyor belt 13, so that the conveyor belt 13 rolls tightly against the horizontal conveying section 11 and the inclined conveying section 12, and prevents the conveyor belt 13 from floating in the air at the connection between the horizontal conveying section 11 and the inclined conveying section 12.

[0060] As a further refinement of the above technical solution, such as Figure 4 , Figure 5 , Figure 6 As shown, a positioning plate 124 and multiple arc-shaped plates 125 are provided between the support frame 122 and the base frame 121. The positioning plate 124 and multiple arc-shaped plates 125 are all located on both sides of the support frame 122 and the base frame 121. The positioning plate 124 is located at the end of the support frame 122 and the base frame 121. The bottom of the positioning plate 124 is fixed to the base frame 121, and the top of the positioning plate 124 is rotatably connected to the support frame 122 through a shaft pin 1241. The shaft pin 1241 serves as the support frame 122 and the base frame 121. At the center of rotation of the frame 121, multiple arc-shaped plates 125 are arranged on the rotation radius of the support frame 122 and the base frame 121 according to their different arc lengths. The bottom of the arc-shaped plate 125 is fixed to the base frame 121. The body of the arc-shaped plate 125 is provided with an arc-shaped groove 1251. Both sides of the support frame 122 are provided with wire grooves 1221. Screws 1252 are threadedly connected to the positions in the wire grooves 1221 that coincide with the arc-shaped grooves 1251. One end of the screw 1252 passes through the arc-shaped groove 1251.

[0061] Depending on the bending angle and bending location of the flexible circuit board 3 to be bent, the angle between the support frame 122 and the base frame 121 can be designed to adjust the highest point that the conveyor belt 13 can reach when conveying the limiting member 2. This allows for adjustment of the angle between the flexible circuit board 3 to be bent and the bending and handling assembly 5. By changing the relative position of the flexible circuit board 3, more flexibility can be provided in selecting the bending position and bending angle of the flexible circuit board 3. During the process of adjusting the angle between the support frame 122 and the base frame 121, the screw 1252 will slide in the arc groove 1251. After rotating and tightening the screw 1252, the screw 1252, the arc plate 125, and the support frame 122 are fixed together, and the angle between the support frame 122 and the base frame 121 is limited.

[0062] As an example, such as Figure 4 , Figure 7 , Figure 8 , Figure 9 As shown, an adjustment component 7 is provided at one end of the inclined conveyor section 12 near the unloading conveyor line 6. The adjustment component 7 is used to install and adjust the relative position between the bending rod 4 and the flexible circuit board 3 to be bent.

[0063] As a further refinement of the above technical solution, the adjusting component 7 includes side plates 71 respectively disposed on both sides of the support frame 122. Multiple sets of positioning holes 1222 are formed on the side of the support frame 122 from top to bottom, with two holes in each set. Multiple sets of mounting slots 72 are formed through the side plates 71 from top to bottom. The mounting slots 72 are strip-shaped, and the size of one set of mounting slots 72 can cover the positioning holes 1222. When any set of mounting slots 72 coincides with a positioning hole 1222, inserting and tightening bolts will adjust the side plate 71. The plate 71 is connected to the support frame 122; the end of the side plate 71 connected to the support frame 122 is the first end, and the other end of the side plate 71 is the last end. A slope is formed between the first end and the last end of the side plate 71. The body of the side plate 71 is provided with multiple U-shaped grooves 73 corresponding to the first end and the last end. The top of the U-shaped grooves 73 is open. When installing the bending rod 4, the two ends of the bending rod 4 are respectively inserted into the corresponding U-shaped grooves 73 of the two side plates 71. The opening of multiple U-shaped grooves 73 can improve the freedom of bending angle and bending contour selection during bending.

[0064] Depending on the bending angle of the flexible circuit board 3 to be bent, the horizontal height of the side plate 71 relative to the support frame 122 can be adjusted by matching the mounting slots 72 and positioning holes 1222 of different heights. This also adjusts the horizontal height of the side plate 71 relative to the limiting member 2 on the conveyor belt 13. The horizontal height of the bending rod 4 located between the two side plates 71 is also adjusted. This allows for the selection of a more suitable bending point based on the size of the flexible circuit board 3 or the bending position when bending the flexible circuit board 3. If the spacing, angle, or size between the bending rod 4 and the flexible circuit board 3 is not properly selected, the flexible circuit board 3 may be damaged during the bending process, affecting the service life and performance of the entire flexible circuit board 3.

[0065] As a further refinement of the above technical solution, the two ends of the bending bar 4 extending out of the side plate 71 are provided with threads, and nuts 41 are threadedly connected to the threads. By tightening the nuts 41, the bending bar 4 is pressed against the side plate 71, and the position of the bending bar 4 is further locked.

[0066] As a further refinement of the above technical solution, the shape and radius of the bending rod 4 vary depending on the bending angle and bending range of the flexible circuit board 3. The size of the bending rod 4 will affect the bending radius of the flexible circuit board 3. If the size of the bending rod 4 is not appropriate, it may cause excessive bending or insufficient bending at the bending point of the flexible circuit board 3.

[0067] As an example, such as Figure 3 , Figure 14 As shown, the bending and conveying assembly 5 is located between the inclined conveyor section 12 and the unloading conveyor line 6. The bottom of the bending and conveying assembly 5 is equipped with a hydrostatic guide rail. The hydrostatic guide rail enables the bending and conveying assembly 5 to move with high precision, which facilitates precise adjustment of the position of the bending and conveying assembly 5 relative to the upper limit member 2 of the conveyor belt 13, and helps to improve bending accuracy.

[0068] As a further refinement of the above technical solution, the hydrostatic guide rail includes a guide rail body 8, a slider 81, and an oil supply system. The slider 81 is slidably connected to the guide rail body 8. The oil supply system is used to form a pressure-bearing oil film between the guide rail body 8 and the slider 81. The pressure-bearing oil film can reduce friction, thereby achieving high-precision positioning of the slider 81. During the movement of the slider 81 along the guide rail body 8, it drives the bending and conveying assembly 5 to move synchronously. The driving force for the movement of the slider 81 comes from the cooperation of the motor and the lead screw. A base plate 82 is provided at the bottom of the guide rail body 8. The base plate 82 is connected to the inclined conveying part 12 and the unloading conveying line 6 respectively through the mounting brackets 83 on both sides.

[0069] As an example, such as Figure 14As shown, the bending and conveying assembly 5 includes a base 51, a hexagonal rotary drum 53, a conveying motor 56, and two upright plates 52. The bottoms of the two upright plates 52 are fixedly connected to the base 51. The hexagonal rotary drum 53 is rotatably disposed between the tops of the two upright plates 52. The conveying motor 56 uses one of the upright plates 52 as its assembly base, and the output end of the conveying motor 56 passes through the upright plate 52 and is connected to the hexagonal rotary drum 53.

[0070] As a further refinement of the above technical solution, such as Figure 15 As shown, the hexagonal drum 53 has six end faces, each of which is detachably connected to a mounting base 531. During the rotation of the hexagonal drum 53, all six end faces are sequentially directed toward the limiting member 2 conveyed by the conveyor belt 13. At least one mounting base 531 is connected to a bending swing block 54 via a connecting rod 532, and at least one mounting base 531 is provided with an adsorption component 55. During the rotation of the hexagonal drum 53, neither the bending swing block 54 nor the adsorption component 55 will come into contact with the base 51.

[0071] As a further refinement of the above technical solution, the bending swing block 54 has a long and curved main structure, and the bending direction of the main structure is inward, that is, towards the end face of the hexagonal rotating cylinder 53. The two ends of the bending swing block 54 are respectively sharp and blunt rounded, and the distance between the two ends of the bending swing block 54 and the hexagonal rotating cylinder 53 is also different. During bending, once the limiting member 2 moves into place, the conveyor belt 13 stops. At this time, the part of the flexible circuit board 3 to be bent extends out of the limiting member 2 and is located above the bending bar 4. The hexagonal drum 53 is driven to rotate by the conveying motor 56. The hexagonal drum 53 drives the connecting rod 532 and the bending swing block 54 to rotate. The relatively sharp end of the bending swing block 54 first contacts the flexible circuit board 3. At this time, the flexible circuit board 3 bends about the bending bar 4. As the hexagonal drum 53 rotates, the relatively blunt end of the bending swing block 54 contacts the flexible circuit board 3. Because the distance between the two ends of the bending swing block 54 and the hexagonal drum 53 is also different, it ensures that the flexible circuit board 3 is gradually bent into place. After the bending is in place, the hexagonal drum 53 will stop rotating for a period of time. This is called the 'bending holding time'. The bending swing block 54 is kept in contact with the flexible circuit board 3 to ensure that the stress is reduced and to reduce the rebound amplitude or bending deformation of the flexible circuit board 3 after bending.

[0072] Depending on the bending angle and bending position, the contact position between the bending swing block 54 and the flexible circuit board 3 will also be different. However, after bending to the correct position, the bending swing block 54 will perform a 'bending hold time' to improve the bending quality.

[0073] As a further refinement of the above technical solution, the adsorption component 55 includes a cylinder 551, a fixing plate 552, and an adsorption element 553. The cylinder 551 is fixedly connected to the mounting base 531. The output end of the cylinder 551 is connected to one end of the fixing plate 552. The fixing plate 552 has multiple strip-shaped through holes 5521. The adsorption element 553 is inserted into the strip-shaped through holes 5521. The adsorption element 553 includes a hollow tube 5531. The hollow tube 5531 passes through the strip-shaped through holes 5521. The top of the hollow tube 5531 extends upward and forms an adsorption port that adsorbs onto the surface of the flexible circuit board 3. The bottom of the hollow tube 5531 is connected to a vacuum pump through a flexible tube.

[0074] After bending is complete, the hexagonal drum 53 rotates, and the bending swing block 54 no longer contacts the flexible circuit board 3. The bending swing block 54 rotates towards the base 51, while the adsorption component 55 rotates towards the bent flexible circuit board 3 until the adsorption port at the top of the hollow tube 5531 rotates and moves to above the unbent horizontal part of the flexible circuit board 3. During this process, the distance between the hollow tube 5531 and the flexible circuit board 3 can be adjusted by extending or retracting the output end of the cylinder 551. When the top adsorption port of the hollow tube 5531 is in contact with the surface of the flexible circuit board 3, the hexagonal drum 53 stops rotating, and the vacuum pump is activated. The vacuum pump draws away the air at the adsorption port through the hollow tube 5531 and forms a negative pressure area, thereby adsorbing and fixing the flexible circuit board 3. After ensuring reliable adsorption, the flexible circuit board 3 can be pulled out from between the two clamping plates 26 by retracting the output end of the cylinder 551. During the extraction process, the roller 264 rolls smoothly without damaging the flexible circuit board 3. After the flexible circuit board 3 is completely extracted, the two clamping plates 26 approach each other, while the hexagonal drum 53 rotates in the opposite direction. The adsorption component 55 drives the already bent flexible circuit board 3 to rotate. After rotating in the opposite direction for a certain angle, the already bent flexible circuit board 3 contacts the unloading conveyor line 6. The bending swing block 54 rotates to above the inclined conveyor section 12. At this time, the vacuum pump can be turned off, and the adsorption component 55 stops adsorbing the flexible circuit board 3. The flexible circuit board 3 is then placed on the unloading conveyor line 6. After the unloading conveyor line 6 is started, the already bent flexible circuit board 3 moves along the unloading conveyor line 6 to the next process, and the conveyor belt 13 can start rolling. The limiting member 2 on the conveyor belt 13 drives the flexible circuit board 3 to be bent toward the bending and transporting component 5 to start the bending process of the next flexible circuit board 3.

[0075] As a further refinement of the above technical solution, the hollow tube 5531 has two nuts 5532 connected to its body by thread. The two nuts 5532 are separated about the strip-shaped through hole 5521. Tightening the two nuts 5532 can further lock and limit the position of the hollow tube 5531 in the strip-shaped through hole 5521 and prevent shaking.

[0076] As a further refinement of the above technical solution, a corrugated rubber cover 5533 is fitted at the bottom of the hollow tube 5531. A filter screen is installed inside the corrugated rubber cover 5533. The filter screen can protect the vacuum pump from the influence of external environment such as dust, dirt, sand, wood chips or metal chips, moisture, and water mist. The corrugated rubber cover 5533 can achieve better mechanical sealing through its elastic material properties, thereby effectively preventing these unwanted substances from entering the interior of the hollow tube 5531.

[0077] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A PFC bending device for fingerprint module production, used for bending flexible circuit boards, characterized in that, The system includes a feeding conveyor line, a limiting component, a bending bar, a bending and conveying assembly, and an unloading conveyor line. The limiting component is used to heat and constrain the flexible circuit board to be bent, wherein the portion of the flexible circuit board to be bent extends out of the limiting component. The feeding conveyor line is used to transport the limiting component and the flexible circuit board to the unloading conveyor line. The bending bar and the bending and conveying assembly are provided at the conveying junction of the feeding and unloading conveyors. The bending and conveying assembly includes a bending swing block and an adsorption assembly that perform sequential and spaced circular motions under the action of a driving force. The bending swing block cooperates with the bending bar to bend the portion of the flexible circuit board that extends out of the limiting component. The adsorption assembly contacts the unbent portion of the flexible circuit board and forms a negative pressure area at the contact point to adsorb the flexible circuit board until it is transported to the unloading conveyor line. The feeding conveyor line includes a horizontal conveying section and an inclined conveying section, with a conveyor belt rolling between the two. The inclined conveyor section is located near the unloading conveyor line. The inclined conveyor section includes a lower base frame and an upper support frame, which are rotatably connected. An adjustment component is provided at one end of the inclined conveyor section near the unloading conveyor line. The adjustment component is used to install and adjust the relative position between the bending bar and the flexible circuit board to be bent. The adjustment assembly includes side plates respectively disposed on both sides of the support frame. The side of the support frame has multiple sets of positioning holes from top to bottom, and the side plates have multiple sets of mounting slots from top to bottom. When any set of mounting slots coincides with the positioning holes, a bolt can be inserted and tightened to connect the side plate to the support frame. One end of the side plate is connected to the support frame as the beginning end, and the other end of the side plate is the end end. A slope is formed between the beginning end and the end end of the side plate. Multiple U-shaped grooves are opened on the side plate body corresponding to the beginning end and the end end. Depending on the bending angle of the flexible circuit board to be bent, the two ends of the bending rod are respectively inserted into the corresponding U-shaped grooves.

2. The PFC bending equipment for fingerprint module production according to claim 1, characterized in that, A positioning plate and multiple arc-shaped plates are provided between the support frame and the base frame. The positioning plate is located at the end of the support frame and the base frame. The bottom of the positioning plate is fixed to the base frame, and the top of the positioning plate is rotatably connected to the support frame through a pivot pin. Using the pivot pin as the center of rotation for the support frame and base frame, multiple arc-shaped plates are arranged on the rotation radius of the support frame and base frame according to their different arc lengths. The bottom of the arc-shaped plates is fixed to the base frame. The body of the arc-shaped plates has an arc-shaped groove. Screws are threaded to the two sides of the support frame corresponding to the positions of the arc-shaped grooves. One end of the screw passes through the arc-shaped groove. Depending on the angle between the support frame and the base frame, the screw slides in the arc-shaped groove. After rotating and tightening the screw, the screw, the arc-shaped plate, and the support frame are fixed together, and the angle between the support frame and the base frame is determined.

3. The PFC bending equipment for fingerprint module production according to claim 1, characterized in that, The bending and conveying assembly is disposed between the inclined conveying section and the unloading conveying line, and a hydrostatic guide rail is provided at the bottom of the bending and conveying assembly. The hydrostatic guide rail includes a guide rail body and a slider. The slider is slidably connected to the guide rail body. As the slider moves along the guide rail body, it drives the bending and conveying assembly to move synchronously. A base plate is provided at the bottom of the guide rail body. The base plate is connected and fixed to the inclined conveyor and the unloading conveyor line respectively through mounting brackets on both sides.

4. The PFC bending equipment for fingerprint module production according to claim 1, characterized in that, The limiting member includes a base plate, the top of which is provided with a mounting groove. The mounting groove has at least one guide opening for inserting the flexible circuit board to be bent. Two clamping plates are slidably arranged in the mounting groove with respect to the flexible circuit board. A heating coil is provided on the bottom surface of the mounting slot at the position corresponding to the limiting constraint of the flexible circuit board. The heating coil is used to preheat the flexible circuit board to be bent before bending. The bottom surface of the mounting slot is provided with a positioning groove, the opening direction of the positioning groove is perpendicular to the sliding direction of the clamping plate, a fixed round rod is provided in the positioning groove, and a return spring is sleeved on the rod body of the fixed round rod. The two ends of the return spring are respectively fixedly connected to the two clamping plates. The clamp has an L-shaped structure consisting of a vertical part and a horizontal part. A fixing part is provided at the bottom of the vertical part corresponding to the positioning groove. The fixing part is slidably sleeved with the fixing rod. Rollers are provided at the positions where the inner wall of the vertical part contacts the two sides of the flexible circuit board. The rollers are in rolling connection with the flexible circuit board.

5. The PFC bending equipment for fingerprint module production according to claim 4, characterized in that, A fixing post is provided at the center position between the two clamping plates on the base plate. A guide groove is provided on the side of the fixing post facing the guide opening. A guide post is vertically arranged in the guide groove. A lifting spring is sleeved on the body of the guide post. A pressure plate is slidably sleeved on the guide post. A connecting plate is provided between the pressure plate and the clamping plates on both sides. The two ends of the connecting plate are rotatably connected to the pressure plate and the clamping plate, respectively.

6. The PFC bending equipment for fingerprint module production according to claim 1, characterized in that, The bending and conveying assembly includes a base, a hexagonal rotary drum, a conveying motor, and two upright plates. The bottoms of the two upright plates are fixedly connected to the base. The hexagonal rotary drum is rotatably disposed between the tops of the two upright plates. The conveying motor uses one of the upright plates as its assembly base, and the output end of the conveying motor passes through the upright plate and is connected to the hexagonal rotary drum. Each of the six end faces of the hexagonal rotating cylinder is detachably connected to a mounting base, wherein at least one of the mounting bases is connected to the bending swing block via a connecting rod, and at least one mounting base is provided with the adsorption component.

7. A PFC bending equipment for fingerprint module production according to claim 1 or 6, characterized in that, The bending pendulum block has a long and curved main structure, with the bending direction of the main structure facing inward. The two ends of the bending pendulum block are respectively sharp and blunt.

8. A PFC bending equipment for fingerprint module production according to claim 6, characterized in that, The adsorption assembly includes a cylinder, a fixed plate, and an adsorption element. The cylinder is fixedly connected to the mounting base, and the output end of the cylinder is connected to one end of the fixed plate. The fixed plate has multiple strip-shaped through holes, and the adsorption element is inserted into the strip-shaped through holes. The adsorption component includes a hollow tube with a through-hole, the top of the hollow tube extending upward and forming an adsorption port that adsorbs onto the surface of the flexible circuit board, and the bottom of the hollow tube is connected to a vacuum pump via a flexible tube.

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