Welding device based on FPC board and component

Abstract

The invention belongs to the technical field of FPC board welding, and particularly relates to a welding device based on an FPC board and a component, the welding device comprises a thermocompression welding device, a placing table, a negative pressure mechanism arranged on the placing table and used for adsorbing the FPC board, and a door frame used for controlling a welding head to move, a hole is formed in the placing table, and an exhaust fan is arranged in the hole; a liquid feeding conical head is arranged in the placing table, the tip end of the liquid feeding conical head extends into the hole, a plugging ball is movably installed at the tip end of the liquid feeding conical head, a liquid nitrogen storage tank is arranged in the placing table, and a liquid feeding assembly is arranged in the placing table and used for extracting liquid nitrogen in the liquid nitrogen storage tank and feeding the liquid nitrogen into the liquid feeding conical head; by driving the contamination block to scratch the blocking ball, a small amount of liquid nitrogen is gasified to generate cold air flow, the cold air flow and the exhaust fan form collaborative cooling, the temperature of a plate body is stabilized, thermal stress deformation is avoided, the defects of insufficient soldering, partial soldering, continuous tin soldering and the like are effectively overcome, and the welding quality is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of FPC board welding technology, specifically a welding device based on FPC boards and components. Background Technology

[0002] Flexible printed circuits, with their flexibility, thinness, and high-density integration, have become core components for electrical connections in fields such as consumer electronics, automotive electronics, and medical devices.

[0003] Currently, the most widely used welding methods are mainly of three types: manual welding, which does not require complex equipment and is highly flexible, is suitable for small-batch production and repair; thermoforming welding is precise and reliable, suitable for fine-pitch solder joints and mass production, and is widely used in the assembly of components such as displays and camera modules; reflow soldering is compatible with surface mount technology, can efficiently handle complex circuits and fine-pitch components, and is the core welding process for mass production of mobile phones, automotive electronics and other products.

[0004] The core of thermocompression soldering is to form a stable intermetallic compound between the molten solder and the FPC board and component leads. The extrusion of the solder head can break the thin oxide layer that may exist on the surface of the pad, allowing the molten solder to fully wet the surface of the pad and leads, avoiding cold solder joints due to oxide layer obstruction. At the same time, the extrusion can expel air from the gaps between the solder joints, reduce bubbles and voids inside the solder joints, and improve the density and mechanical strength of the solder joints.

[0005] However, the flexible substrates commonly used in FPCs, such as polyimide and polyester, although they have good insulation, have limited high-temperature resistance and insufficient rigidity. Even when the temperature meets the process requirements, the molecular chain activity of the substrate will increase during welding, further enhancing its flexibility. Under the external force of hot-press welding or its own stress, it is very easy to deform. The weaker the resistance to deformation, the more wrinkles and warping will occur even with slight external force. This will cause the welding head 4 to be misaligned with the pad, and will also cause uneven stress on the solder joint, leading to defects such as cold solder joint, misaligned solder joint, and bridging, ultimately reducing the welding quality.

[0006] Therefore, the present invention provides a welding device for FPC boards and components. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by the present invention to solve its technical problem is: the welding device based on FPC board and components of the present invention includes a hot press welding device, a mounting platform, a negative pressure mechanism set on the mounting platform for adsorbing FPC board, and a gantry for controlling the movement of the welding head.

[0009] The mounting platform has holes, and an exhaust fan is installed inside the holes;

[0010] The inside of the placing table is provided with a liquid delivery cone head, the tip of the liquid delivery cone head extends into the hole, and a blocking ball is movably installed at the tip of the liquid delivery cone head;

[0011] The inside of the placing table is provided with a liquid nitrogen storage tank, and the inside of the placing table is provided with a liquid delivery assembly for extracting liquid nitrogen in the liquid nitrogen storage tank and delivering it into the liquid delivery cone head;

[0012] The gantry is slidably installed with a meandering frame, the meandering frame is connected with the welding head through a telescopic rod, and the bottom end of the meandering frame is provided with a transmission assembly for controlling the liquid nitrogen extraction of the liquid delivery assembly through the activation of the welding head;

[0013] The hole is rotatably installed with a rotating ring, and the outer wall of the rotating ring is fixedly installed with a contamination block for scraping the blocking ball.

[0014] The liquid delivery assembly comprises a temporary storage cylinder, a suction pipe, a delivery pipe and a piston, the temporary storage cylinder is fixedly installed in the inside of the placing table and is inclined downward towards the hole, the piston is slidably installed in the inside of the temporary storage cylinder, the suction pipe and the delivery pipe are arranged on the temporary storage cylinder, the other end of the suction pipe extends into the liquid nitrogen storage tank, the other end of the delivery pipe extends into the liquid delivery cone head, and one-way valves are arranged on the suction pipe and the delivery pipe.

[0015] The other end of the piston is fixedly installed with a piston rod, one end of the piston rod extends out of the temporary storage cylinder, and a tension spring is arranged between the piston rod and the temporary storage cylinder.

[0016] The transmission assembly comprises a winding wheel, a connecting rope and a rack, the winding wheel is rotatably installed at the bottom of the meandering frame, the outer wall of the winding wheel is fixedly installed with a rotating gear, the rack is fixedly installed on the gantry and is engaged with the rotating gear, one end of the connecting rope is fixedly connected with the winding wheel, and the other end extends into the inside of the placing table and is connected with the piston rod.

[0017] The hole is fixedly installed with a positioning ring, the positioning ring is composed of two rings, the outer wall of the positioning ring is attached to the inner wall of the hole, a containing groove is formed in the positioning ring, the liquid delivery cone head and the contamination block are located in the inside of the containing groove, the rotating ring is located in the inside of the containing groove, a friction block is fixedly installed at the top end of the rotating ring, the top end of the friction block is attached to the positioning ring, a plurality of friction blocks are arranged in an annular array, and gaps are left between each friction block.

[0018] The inside of the liquid delivery cone head is fixedly provided with a baffle, a flowing port for cooperating with the blocking ball is formed in the baffle, a liquid storage cavity is left between the baffle and the blocking ball, a push plate for pushing the blocking ball is slidably arranged in the inside of the rotating ring, and a temperature control mechanism is arranged on the placing table.

[0019] The inside of the rotating ring is provided with a control ring through a torsion spring, a sliding groove for the push plate to slide is formed in the control ring, a blocking plate for blocking the gap between the two friction blocks is fixedly arranged at the top end of the control ring, a plurality of blocking plates are arranged in an annular array, and an impeller is fixedly arranged on the inner wall of the rotating ring.

[0020] The inside of the placing table is fixedly provided with an annular air box, an air cylinder is fixedly arranged at the top end of the annular air box, an air rod is slidably arranged in the inside of the air cylinder, an air exhaust hole is formed in the outer wall of the air rod, and a heat dissipation metal plate is fixedly arranged at the top end of the air rod.

[0021] The inside of the containing groove is fixedly provided with a gas delivery pipe, a gas hole is formed in one end of the gas delivery pipe, and the other end of the gas delivery pipe extends into the inside of the annular air box.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The welding device based on the FPC board and components, which firstly accelerates the air flow circulation at the bottom of the FPC board through the exhaust fan, preliminarily reduces the flexibility of the FPC board to inhibit deformation, simultaneously drives the liquid delivery assembly through the transmission assembly, extracts liquid nitrogen to the liquid delivery cone head, and drives the contaminated block to scrape the blocking ball through the rotating ring, so that a small amount of liquid nitrogen is gasified to generate cold air flow, cooperates with the exhaust fan to form synergistic cooling, further weakens the activity of the molecular chain of the base material, strengthens the cooling effect, stabilizes the temperature of the plate body to avoid thermal stress deformation, effectively solves the problems of misalignment of the welding head and the pad, uneven force of the welding point, reduces defects such as virtual welding, offset welding and continuous soldering, and greatly improves the welding quality.

[0024] 2. The welding device based on the FPC board and components, when the temperature of the FPC board exceeds the threshold value through the infrared temperature sensor, the electromagnet is triggered to push the push plate, so that the liquid nitrogen in the liquid storage cavity is released and rapidly gasified to generate strong cold air flow; on the other hand, the blocking plate is temporarily blocked between the friction blocks through the control ring, so that the cold air flow is accurately blown to the bottom of the plate through the exhaust fan after being fully gathered, the temperature of the plate body is stabilized to avoid thermal stress deformation, in the process, the cold air flow also pushes the air rod in the annular air box, drives the heat dissipation metal plate to be attached to the FPC board, strengthens the cold quantity conduction, and provides rigid support, solves the problems of misalignment of the welding head and the pad, uneven force of the welding point from the root, and significantly improves the welding reliability and the qualified rate of finished products. BRIEF DESCRIPTION OF DRAWINGS

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is a schematic diagram of the heat dissipation metal plate in this invention;

[0028] Figure 3 In this invention Figure 2 Enlarged view of point A in the image;

[0029] Figure 4 This is a cross-sectional view of the temporary storage cylinder in this invention;

[0030] Figure 5 In this invention Figure 4 Enlarged view of point B in the image;

[0031] Figure 6 This is a cross-sectional view of the positioning ring in this invention;

[0032] Figure 7 In this invention Figure 6 Enlarged view of point C in the image.

[0033] In the diagram: 1. Hot press welding device; 2. Placement platform; 3. FPC board; 4. Welding head; 5. Gantry; 6. U-shaped frame; 7. Connecting rope; 8. Heat dissipation metal plate; 9. Rack; 10. Temporary storage cylinder; 11. Piston; 12. Piston rod; 13. Suction pipe; 14. Exhaust fan; 15. Impeller; 16. Annular gas box; 17. Discharge pipe; 18. Gas cylinder; 19. Gas rod; 20. Exhaust hole; 21. Liquid delivery cone; 22. Baffle; 23. Sealing ball; 24. Positioning ring; 25. Rotating ring; 26. Contaminated block; 27. Gas delivery pipe; 28. Control ring; 29. ​​Sealing plate; 30. Friction block; 31. Push plate; 32. Slide groove; 33. Receiving tank; 34. Liquid storage chamber; 35. Flow outlet; 36. Rewinding wheel. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] The welding apparatus based on FPC board and components described in this embodiment of the invention includes a hot press welding device 1, a mounting platform 2, a negative pressure mechanism disposed on the mounting platform 2 for adsorbing FPC board 3, and a gantry 5 for controlling the movement of welding head 4.

[0036] The mounting platform 2 has holes, and an exhaust fan 14 is installed in the holes;

[0037] The exhaust fan 14 is built-in motor, when the welding starts, through the start of the exhaust fan 14, can drive air flow to the bottom end of the FPC board 3, accelerate the heat dissipation of the bottom of the FPC board 3, reduce the flexibility of the FPC board 3, solve the problem of FPC board 3 wrinkle, warping, lead to the problem of welding head and pad alignment offset.

[0038] The inside of the placing table 2 is provided with a liquid delivery cone 21, the tip of the liquid delivery cone 21 extends into the hole, and the tip of the liquid delivery cone 21 is movably installed with a blocking ball 23;

[0039] A rotating ring 25 is rotatably installed in the hole, and a contamination block 26 for scraping the blocking ball 23 is fixedly installed on the outer wall of the rotating ring 25.

[0040] The inside of the placing table 2 is provided with a liquid nitrogen storage tank, and the inside of the placing table 2 is provided with a liquid delivery assembly for extracting the liquid nitrogen in the liquid nitrogen storage tank and sending it into the liquid delivery cone 21;

[0041] The liquid nitrogen in the liquid nitrogen storage tank is extracted by the liquid delivery assembly and sent into the inside of the liquid delivery cone 21, at this time the liquid nitrogen will gasify to make the pressure in the inside of the liquid delivery cone 21 rise, and push the blocking ball 23 to extrude and block the opening of the liquid delivery cone 21, by controlling the rotation of the rotating ring 25, the contamination block 26 is in contact with the blocking ball 23 when rotating, and under the action of friction, the blocking ball 23 rotates, at this time the end of the blocking ball 23 contaminated with liquid nitrogen will be away from the liquid delivery cone 21, a small amount of liquid nitrogen reacts with air to produce a certain amount of cold air flow, at the same time, the exhaust fan 14 blows the cold air flow to the bottom of the FPC board 3, further improves the cooling effect, avoids local high temperature leading to deformation, and causes defects such as virtual welding, offset welding, and continuous tin, and finally reduces the problem of welding quality.

[0042] The gantry 5 is slidably installed with a backshaped frame 6, the backshaped frame 6 is connected with the welding head 4 through the extension rod, the bottom end of the backshaped frame 6 is provided with a transmission assembly for controlling the liquid delivery assembly to extract liquid nitrogen through the start of the welding head 4;

[0043] Through the transmission assembly, the liquid delivery assembly can extract liquid nitrogen and send it into the liquid delivery cone 21 for standby when the welding head 4 is started.

[0044] The liquid delivery assembly includes a temporary storage cylinder 10, a suction pipe 13, a delivery pipe 17 and a piston 11, the temporary storage cylinder 10 is fixedly installed in the inside of the placing table 2 and is inclined downward towards the hole, the piston 11 is slidably installed in the inside of the temporary storage cylinder 10, the suction pipe 13 and the delivery pipe 17 are both provided on the temporary storage cylinder 10, the other end of the suction pipe 13 extends into the liquid nitrogen storage tank, the other end of the delivery pipe 17 extends to the liquid delivery cone 21, and one-way valves are provided on the suction pipe 13 and the delivery pipe 17.

[0045] The one-way valve arranged on the suction pipe 13 can only allow the flow from the liquid nitrogen storage tank to the temporary storage cylinder 10, and the one-way valve arranged on the delivery pipe 17 can only allow the flow from the temporary storage cylinder 10 to the liquid delivery cone 21.

[0046] Therefore, when the piston 11 slides from the right side to the left side (refer to Figure 4 ), the liquid nitrogen in the liquid nitrogen storage tank can be extracted through the suction pipe 13 and into the temporary storage cylinder 10 (an electromagnetic valve is arranged on the liquid nitrogen storage tank to cooperate with the sliding of the piston 11 to realize the extraction of liquid nitrogen), and then the piston 11 is controlled to slide from the left side to the right side, so that the liquid nitrogen in the temporary storage cylinder 10 is delivered into the inside of the liquid delivery cone 21. Since the liquid nitrogen is not easy to completely remain in a liquid state after entering the temporary storage cylinder 10, the pressure will affect the reset of the piston 11, so the temporary storage cylinder 10 is arranged obliquely to make part of the liquid nitrogen flow into the inside of the liquid delivery cone 21, which is convenient for the subsequent rotation of the rotating ring 25 to drive the contamination block 26 to contact the blocking ball 23, so that the blocking ball 23 rotates and reacts with the contaminated liquid nitrogen and air to generate a certain cold air flow, which is blown to the bottom of the FPC board 3 in cooperation with the exhaust fan 14, so as to avoid local high temperature causing deformation and causing defects such as virtual welding, partial welding, and continuous tin, and finally reducing the welding quality.

[0047] The other end of the piston 11 is fixedly installed with a piston rod 12, one end of the piston rod 12 extends out of the temporary storage cylinder 10, and a tension spring is arranged between the piston rod 12 and the temporary storage cylinder 10.

[0048] When the piston rod 12 drives the piston 11 to move towards the left side, the tension spring will also be deformed at this time and store elastic potential energy. Through the rotation of the rotating ring 25 to drive the contamination block 26 to contact the blocking ball 23, the blocking ball 23 rotates and reacts with the contaminated liquid nitrogen and air until the liquid nitrogen in the temporary storage cylinder 10 is consumed and the internal pressure is less than the elastic force of the tension spring, at which time the piston rod 12 and the piston 11 are reset.

[0049] The transmission assembly includes a winding wheel 36, a connecting rope 7, and a rack 9. The winding wheel 36 is rotatably installed at the bottom of the back-shaped frame 6, the outer wall of the winding wheel 36 is fixedly installed with a rotating gear, the rack 9 is fixedly installed on the gantry 5 and meshes with the rotating gear, one end of the connecting rope 7 is fixedly connected with the winding wheel 36, and the other end extends into the inside of the placement table 2 and is connected with the piston rod 12.

[0050] When the welding head 4 slides downward in preparation for welding, the welding head 4 drives the loop frame 6 to slide downward via the telescopic rod. The winding wheel 36, located at the bottom of the loop frame 6, winds up the connecting rope 7 through the cooperation of the rotating gear and rack 9. When winding, the connecting rope 7 pulls the piston rod 12 and piston 11 to slide from right to left inside the temporary storage cylinder 10. The welding head 4 makes a single large downward movement when welding the FPC board 3, which is convenient for replacing the FPC board 3 after welding. This single sliding movement drives the piston rod 12 and piston 11 to slide inside the temporary storage cylinder 10, and the liquid nitrogen in the liquid nitrogen storage tank is drawn into the temporary storage cylinder 10 for later use in conjunction with the suction pipe 13 and the discharge pipe 17.

[0051] A positioning ring 24 is fixedly installed inside the hole. The positioning ring 24 consists of two rings, an upper and a lower one. The outer wall of the positioning ring 24 fits against the inner wall of the hole. A receiving groove 33 is formed inside the positioning ring 24. The liquid delivery cone 21 and the contaminated block 26 are both located inside the receiving groove 33. A rotating ring 25 is located inside the receiving groove 33. A friction block 30 is fixedly installed on the top of the rotating ring 25. The top of the friction block 30 fits against the positioning ring 24. Multiple friction blocks 30 are arranged in a circular array, and a gap is left between each friction block 30.

[0052] The rotating ring 25 is positioned between the upper and lower rings, with the top of the rotating ring 25 not touching the bottom of the upper ring. When the rotating ring 25 rotates, it drives multiple friction blocks 30 to rub against the bottom of the upper ring. Through friction, the contact area between the upper ring and the friction blocks 30 heats up. At this time, the rotating ring 25, in conjunction with the contamination block 26, causes the sealing ball 23 to rotate and reacts the contaminated liquid nitrogen with the air, generating a certain amount of cold airflow. This cold airflow can only be discharged through the gaps between the multiple friction blocks 30. When discharged, it will come into contact with the heated part of the upper ring and the friction blocks 30, thereby consuming part of the temperature of the cold airflow. This avoids the problem of excessive temperature difference between the FPC board 3 and the solder joint when the welding has just started and the temperature is not high, which could generate thermal stress and cause deformation of the FPC board 3.

[0053] A baffle 22 is fixedly installed inside the liquid delivery cone 21. The baffle 22 has a flow port 35 for cooperating with the sealing ball 23. A liquid storage cavity 34 is left between the baffle 22 and the sealing ball 23. A push plate 31 for pushing the sealing ball 23 is slidably installed inside the rotating ring 25. A temperature control mechanism is provided on the placement platform 2. By receiving a signal that the temperature of the FPC board 3 exceeds the threshold, the push plate 31 is controlled to slide.

[0054] The temperature control mechanism includes an infrared temperature sensor and an electromagnet. The infrared temperature sensor monitors the temperature of the FPC board 3 in real time and sets a safety threshold (for example, 80°C). When the temperature of the FPC board 3 exceeds the threshold, the infrared temperature sensor triggers a signal to control the electromagnet to be powered on and push the push plate 31 to slide inside the rotating ring 25. When the push plate 31 slides to the position of the containing groove 33, the rotation of the rotating ring 25 will push the push plate 31 to push the blocking ball 23, which slides inside the liquid delivery cone head 21 and blocks the flow port 35 on the baffle 22. At this time, the liquid nitrogen in the liquid storage cavity 34 will enter the inside of the containing groove 33 and react quickly with the air to produce a large amount of cold gas, which will then enter the hole through the gap between the multiple friction blocks 30, and finally be blown under the FPC board 3 by the exhaust fan 14 to stabilize the temperature of the FPC board 3 and avoid the problem of continuous welding of the FPC board 3 causing its deformation due to overheating, thereby affecting the welding quality. The push plate 31 is installed inside the rotating ring 25 by a return spring. After the temperature returns to the threshold, the electromagnet is powered off, and the push plate 31 is reset under the action of the return spring to maintain the temperature of the FPC board 3.

[0055] The inside of the rotating ring 25 is installed with a control ring 28 through a torsion spring. The control ring 28 is provided with a sliding groove 32 for the push plate 31 to slide. The top end of the control ring 28 is fixedly installed with a blocking plate 29 for blocking the gap between the two friction blocks 30. The blocking plate 29 is arranged in an annular array. The inner wall of the rotating ring 25 is fixedly installed with an impeller 15.

[0056] When the exhaust fan 14 rotates, it will guide the airflow from the impeller 15. The rotation of the impeller 15 will drive the rotating ring 25 to rotate synchronously. When the infrared temperature sensor detects that the temperature of the FPC board 3 exceeds the threshold, it will trigger a signal to control the electromagnet to be powered on and push the push plate 31 to slide inside the rotating ring 25. At this time, the push plate 31 will pass through the sliding groove 32 and enter the inside of the containing groove 33. At this time, the rotation of the rotating ring 25 will drive the push plate 31 to slide horizontally inside the sliding groove 32 until it reaches the end. At this time, the control ring 28 will also rotate a distance and drive the multiple blocking plates 29 to block the gaps between the multiple friction blocks 30. At this time, the push plate 31 will push the blocking ball 23, which will slide inside the liquid delivery cone head 21 and block the flow port 35 on the baffle 22. At this time, the liquid nitrogen in the liquid storage cavity 34 will enter the inside of the containing groove 33 and react quickly with the air to produce a large amount of cold gas to stay inside the containing groove 33.

[0057] The bottom of the push plate 31 is elastically mounted with a clamping block matched with the control ring 28, and the sliding track of the clamping block is provided with an inclination at both ends, when the push plate 31 is not pushed out, the push plate 31 is clamped with the control ring 28 through the clamping block, when the push plate 31 is pushed out, the clamping block is disconnected with the control ring 28, so that the push plate 31 can drive the control ring 28 to rotate, at the same time, the control ring 28 is connected through the torsion spring, so that when the rotating ring 25 stops rotating, the torsion spring drives the control ring 28 to reset (at this time, the positions of the friction block 30 and the blocking plate 29 are corresponding), and the clamping block is clamped with the control ring 28 again.

[0058] The inside of the placing table 2 is fixedly installed with an annular air box 16, the top end of the annular air box 16 is fixedly installed with an air cylinder 18, the inside of the air cylinder 18 is slidably installed with an air rod 19, the outer wall of the air rod 19 is provided with an air exhaust hole 20, and the top end of the air rod 19 is fixedly installed with a heat dissipation metal plate 8.

[0059] The inside of the containing groove 33 is fixedly installed with a gas feeding pipe 27, the gas feeding pipe 27 is provided with a gas hole at one end of the containing groove 33, and the other end of the gas feeding pipe 27 extends into the inside of the annular air box 16.

[0060] When the infrared temperature measurement sensor detects that the temperature of the FPC board 3 exceeds the threshold value, a trigger signal is generated, the electromagnet is powered on, and the push plate 31 is pushed to slide in the inside of the rotating ring 25, at this time, the push plate 31 pushes the blocking ball 23 to discharge the liquid nitrogen in the liquid storage cavity 34 into the inside of the containing groove 33, and drives the multiple blocking plates 29 to block the gap between the multiple friction blocks 30 through the control ring 28, at this time, the liquid nitrogen in the containing groove 33 reacts rapidly with the air to produce a large amount of cold gas remaining in the inside of the containing groove 33, the gas enters the inside of the annular air box 16 through the gas feeding pipe 27, and as the gas increases, the air rod 19 is lifted upwards until the gas in the annular air box 16 is discharged through the air exhaust hole 20 and contacts the heat dissipation metal plate 8, because the air rod 19 slides upwards, the heat dissipation metal plate 8 is brought into contact with the FPC board 3, the temperature of the cold gas absorbed by the metal mesh plate is utilized to enhance the cold utilization rate and reduce the cold loss, and the exhaust fan 14 is further used to improve the heat dissipation efficiency.

[0061] The above-mentioned front, back, left, right, up and down are based on the drawings in the specification Figure 1 as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0062] In the description of the application, it is to be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings and are used only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the application.

[0063] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A welding device based on FPC board and components, comprising a hot pressure welding device (1), a placing table (2), a negative pressure mechanism arranged on the placing table (2) for adsorbing an FPC board (3), and a portal (5) for controlling the movement of a welding head (4). characterized in that A hole is formed in the placing table (2), and an exhaust fan (14) is arranged in the hole. A liquid delivery cone (21) is arranged in the placing table (2), the tip of the liquid delivery cone (21) extends into the hole, and a sealing ball (23) is movably arranged at the tip of the liquid delivery cone (21). A liquid nitrogen storage tank is arranged in the placing table (2), and a liquid delivery assembly is arranged in the placing table (2) for extracting liquid nitrogen in the liquid nitrogen storage tank and delivering it into the liquid delivery cone (21). A meandering frame (6) is slidably arranged on the portal (5), the meandering frame (6) is connected to the welding head (4) through a telescopic rod, and a transmission assembly is arranged at the bottom end of the meandering frame (6) for controlling the liquid delivery assembly to extract liquid nitrogen through the activation of the welding head (4). A rotating ring (25) is rotatably arranged in the hole, and a contamination block (26) is fixedly arranged on the outer wall of the rotating ring (25) for scraping the sealing ball (23).

2. The soldering device based on FPC board and components according to claim 1, characterized in that: The liquid delivery assembly comprises a temporary storage cylinder (10), a suction pipe (13), a delivery pipe (17), and a piston (11), the temporary storage cylinder (10) is fixedly arranged in the placing table (2) and is inclined downward towards the hole, the piston (11) is slidably arranged in the temporary storage cylinder (10), the suction pipe (13) and the delivery pipe (17) are arranged on the temporary storage cylinder (10), one end of the suction pipe (13) extends into the liquid nitrogen storage tank, and the other end of the delivery pipe (17) extends into the liquid delivery cone (21), and one-way valves are arranged on the suction pipe (13) and the delivery pipe (17).

3. The apparatus according to claim 2, wherein: A piston rod (12) is fixedly arranged at the other end of the piston (11), one end of the piston rod (12) extends out of the temporary storage cylinder (10), and a tension spring is arranged between the piston rod (12) and the temporary storage cylinder (10).

4. The apparatus according to claim 3, characterized in that: The transmission assembly comprises a winding wheel (36), a connecting rope (7), and a rack (9), the winding wheel (36) is rotatably arranged at the bottom of the meandering frame (6), a rotating gear is fixedly arranged on the outer wall of the winding wheel (36), the rack (9) is fixedly arranged on the portal (5) and engages with the rotating gear, one end of the connecting rope (7) is fixedly connected with the winding wheel (36), and the other end extends into the placing table (2) and is connected with the piston rod (12).

5. The apparatus according to claim 4, wherein: The hole is fixedly installed with a positioning ring (24), the positioning ring (24) is composed of two rings, the outer wall of the positioning ring (24) is attached to the inner wall of the hole, the positioning ring (24) forms an accommodating groove (33) in the inside, the liquid sending cone head (21) and the staining block (26) are located in the inside of the accommodating groove (33), the rotating ring (25) is located in the inside of the accommodating groove (33), the top end of the rotating ring (25) is fixedly installed with a friction block (30), the top end of the friction block (30) is attached to the positioning ring (24), the friction block (30) is arranged in an annular array, and a gap is formed between each friction block (30).

6. The apparatus according to claim 5, wherein: The inside of the liquid sending cone head (21) is fixedly installed with a baffle (22), the baffle (22) is provided with a flowing port (35) for cooperating with the blocking ball (23), a liquid storage cavity (34) is formed between the baffle (22) and the blocking ball (23), the inside of the rotating ring (25) is slidably installed with a push plate (31) for pushing the blocking ball (23), the placing table (2) is provided with a temperature control mechanism, the push plate (31) is controlled to slide by receiving a signal that the temperature of the FPC board (3) exceeds a threshold value.

7. The apparatus according to claim 6, wherein: The inside of the rotating ring (25) is installed with a control ring (28) through a torsion spring, the control ring (28) is provided with a sliding groove (32) for sliding of the push plate (31), the top end of the control ring (28) is fixedly installed with a blocking plate (29) for blocking the gap between the two friction blocks (30), the blocking plate (29) is arranged in an annular array, and the inner wall of the rotating ring (25) is fixedly installed with an impeller (15).

8. The apparatus according to claim 7, characterized in that: The inside of the placing table (2) is fixedly installed with an annular air box (16), the top end of the annular air box (16) is fixedly installed with an air cylinder (18), the inside of the air cylinder (18) is slidably installed with an air rod (19), the outer wall of the air rod (19) is provided with an air exhaust hole (20), and the top end of the air rod (19) is fixedly installed with a heat dissipation metal plate (8). The inside of the accommodating groove (33) is fixedly installed with a gas sending pipe (27), one end of the gas sending pipe (27) is provided with an air hole in the accommodating groove (33), and the other end of the gas sending pipe (27) extends into the inside of the annular air box (16).

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