Feeding welding machine for electric contact terminal and feeding welding method

Abstract

The invention discloses a feeding and welding machine for an electric contact terminal and a feeding and welding method, and the feeding and welding machine comprises an object placing table, a feeding mechanism, a welding mechanism and a welding mechanism, the angle deviation rectifying device is used for keeping the axial direction of the electric contact terminal perpendicular to the table top and driving the electric contact terminal to rotate in the circumferential direction until the protruding direction of the crimping part is consistent with the preset target direction so as to adjust and rectify the circumferential angle of the electric contact terminal; and the welding head is used for translating the rectified electric contact terminal from the angle rectifying device to the substrate and welding the pin seat of the electric contact terminal on the substrate. According to the electric contact terminal welding device, the angle correction device can carry out angle adjustment and correction on the whole electric contact terminal, so that the crimping part on the electric contact terminal faces the preset target direction, the welding head translates the electric contact terminal to the substrate for welding, and when a plurality of electric contact terminals are welded on the same substrate, the electric contact terminal is welded on the substrate. And the crimping parts on the electric contact terminals can be ensured to face the same direction.

Description

Technical Field

[0001] This invention relates to the field of semiconductor technology, and in particular to a feeding and welding machine and a feeding and welding method for electrical contact terminals. Background Technology

[0002] The primary function of electrical contact terminals is to connect the DBC (copper-clad ceramic laminate) to the PCB (printed circuit board) in a semiconductor module. Currently, the connection methods between electrical contact terminals and circuit boards typically include soldering and crimping. For example... Figure 1 As shown on the right, the electrical contact terminals are inserted into pinholes on the circuit board and connected to the circuit board via solder. This soldering method makes disassembly difficult after installation and subsequent maintenance challenging. When connection problems occur, many parts are scrapped, resulting in high scrapping costs. Figure 1 As shown on the left, a crimping portion is formed on the electrical contact terminal. When the electrical contact terminal passes through the pinhole on the circuit board, the crimping portion presses against the circuit board, thus connecting the electrical contact terminal to the circuit board. Of the two installation methods described above, the crimping method is increasingly widely used because it is easier to install and remove.

[0003] In the above-mentioned crimping method, in order to ensure the uniformity of mechanical connection force on the circuit board and the stability of electrical connection, it is necessary to ensure that the orientation of the crimping part on the electrical contact terminal is controlled within a certain precision range.

[0004] However, before connecting the electrical contact terminals to the circuit board, they usually need to be pre-fixed to the substrate. Therefore, the orientation of the crimping portion on the electrical contact terminal is limited by the relative position of the electrical contact terminal mounted on the substrate. In the prior art, the electrical contact terminal is a separate type, including a pin seat and a pin body with a crimping portion. The process of mounting the electrical contact terminal on the substrate is basically as follows: first, the pin seat is soldered to the substrate, and then the pin body is punched and inserted into the socket of the pin seat, so that the pin seat and the pin body achieve electrical and mechanical connection.

[0005] The above installation method has the following problems: (1) During the process of punching and inserting the pin body on the pin seat, it is easy to cause damage to the insertion end of the pin body, deformation of the pin body, and damage to the pin seat, which will lead to the scrapping of the assembled electrical contact terminal and may also lead to the scrapping of the entire module; (2) After the pin body is deformed or damaged, it will cause dimensional deviation, and the pin body may be subjected to force and circumferentially deflected during the insertion of the pin seat, making it difficult to ensure the orientation of the crimping part on the electrical contact terminal, which will affect the uniformity of the force on the circuit board and the stability of the electrical connection after the circuit board is crimped with the electrical contact terminal. Summary of the Invention

[0006] This invention provides a feeding and welding machine and a feeding and welding method for electrical contact terminals. The purpose is to improve the feeding and installation process of electrical contact terminals on a substrate, reduce the circumferential angle error of the crimping part during installation, thereby improving the installation position accuracy of the electrical contact terminals and ensuring that the protrusion direction of the crimping part is controllable after the electrical contact terminals are installed on the substrate.

[0007] On one hand, the present invention provides a feeding and welding machine for electrical contact terminals, wherein the electrical contact terminal includes a pin holder and a pin body connected to the pin holder, and the pin body has a crimping portion protruding along its outer diameter direction for crimping with a circuit board; the feeding and welding machine includes: A shelf, the surface of which is used to place the substrate; An angle correction device is used to keep the axial direction of the electrical contact terminal perpendicular to the platform surface and drive the electrical contact terminal to rotate circumferentially until the protrusion direction of the crimping part is consistent with the preset target direction, so as to adjust and correct the circumferential angle of the electrical contact terminal; and A welding head is used to move the corrected electrical contact terminal from the angle correction device to the substrate and weld the pin seat of the electrical contact terminal to the substrate.

[0008] As an optional implementation, the angle correction device includes: A turntable is provided with a positioning hole for inserting the needle seat. The positioning hole is coaxial with the rotation axis of the turntable and is perpendicular to the table surface of the storage platform. The monitoring unit is connected to the controller. When the needle seat is inserted into the positioning hole, the monitoring unit can monitor the electrical contact terminal and transmit the data to the controller. During the rotation of the electrical contact terminal with the turntable, when the protrusion direction of the crimping part is consistent with the preset target direction, the controller controls the turntable to stop rotating.

[0009] As an optional implementation, the turntable is provided with a negative pressure adsorption unit that communicates with the positioning hole and is used to create a negative pressure in the positioning hole; The positioning hole can be used to negatively adsorb the needle holder through the negative pressure adsorption unit, restricting the circumferential rotation of the needle holder relative to the positioning hole, so that the electrical contact terminal rotates together with the turntable.

[0010] As an optional implementation, a feeding device is also provided upstream of the angle correction device. The feeding device is used to adjust the electrical contact terminal to the feeding posture and feed it into the positioning hole of the turntable. In the loading posture, the axial direction of the electrical contact terminal is along the axial direction of the positioning hole.

[0011] As an optional implementation, the feeding device includes: The material feeding and conveying mechanism is used to sequentially feed and convey electrical contact terminals; The flipping mechanism is configured to pick up an electrical contact terminal from the discharge end of the material feeding and conveying mechanism and flip the picked-up electrical contact terminal to the loading posture; The transfer mechanism is configured to transfer the electrical contact terminals in the loading posture from the flipping mechanism to the positioning hole of the turntable.

[0012] As an optional implementation, the flipping mechanism includes: The turntable is rotatable about its own axis, and the axis of rotation of the turntable is perpendicular to the axis of rotation of the turntable. A first suction nozzle is disposed on the peripheral wall of the turntable and extends radially along the turntable; the first suction nozzle has a suction position and a discharge position, and reciprocates between the suction position and the discharge position under the drive of the turntable; When the first suction nozzle moves to a suction position near the end of the material feeding mechanism, the first suction nozzle picks up the electrical contact terminal from the end of the material feeding mechanism. When the first suction nozzle moves to the discharge position, the first suction nozzle rotates at a preset angle with the turntable and flips the electrical contact terminal to the feeding posture.

[0013] As an optional implementation, the inner diameter of the first suction nozzle is matched with the outer diameter of the needle holder, and the first suction nozzle picks up or releases the electrical contact terminal by sucking up or releasing the needle holder.

[0014] As an optional implementation, the transfer mechanism includes: The second suction nozzle is used to draw in or release the needle body; The movable mounting base is used to drive the second suction nozzle to reciprocate between directly above the discharge position and directly above the positioning hole of the turntable; When the second suction nozzle moves to directly above the discharge position, the first suction nozzle releases the needle seat, and the second suction nozzle picks up the needle body to retrieve the electrical contact terminal. When the second suction nozzle picks up material and moves directly above the positioning hole, the second suction nozzle releases the needle body, allowing the needle seat to extend into the positioning hole.

[0015] On the other hand, the present invention also provides a feeding and welding method for electrical contact terminals, the feeding and welding method comprising the following steps: S100: Load the electrical contact terminal onto the angle correction device, and make the axial direction of the loaded electrical contact terminal perpendicular to the substrate; S200: The angle correction device drives the electrical contact terminal to rotate circumferentially until the protrusion direction of the crimping part is consistent with the preset target direction; S300: Move the electrical contact terminal onto the substrate and solder the pin seat of the electrical contact terminal onto the substrate.

[0016] As an optional implementation, steps S100 to S300 are sequentially performed on the same substrate and repeated multiple times, thereby welding multiple electrical contact terminals onto the same substrate, with the crimping portions on each electrical contact terminal facing the same direction.

[0017] In this embodiment of the invention, the needle body and needle seat are first fixedly connected to form an electrical contact terminal. Then, the overall angle of the electrical contact terminal is adjusted and corrected so that the crimping portion on the electrical contact terminal faces a preset target direction. Then, the welding head moves the electrical contact terminal onto the substrate for welding. This ensures that the circumferential attitude angle deviation of the electrical contact terminal on the substrate is controlled within ±5°. When multiple electrical contact terminals are welded to the same substrate, the crimping portion on each electrical contact terminal can be ensured to face in the same direction. When the circuit board is connected to the crimping portion on the electrical contact terminal, the circuit board can be ensured to be subjected to uniform force and the electrical contact is stable.

[0018] In addition, the needle holder and needle body are pre-assembled before the needle holder is soldered to the substrate. If the needle holder and needle body are damaged or deformed during the assembly process, they can be scrapped. Therefore, it will not damage the substrate, nor will it affect the verticality of the needle body installed on the base. Attached Figure Description

[0019] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the connection between electrical contact terminals and circuit boards in the prior art, where point A is the crimping method and point B is the soldering method; Figure 2 This is a schematic diagram of the installation of electrical contact terminals and substrate in the prior art; Figure 3 This is a schematic diagram of the structure of the electrical contact terminal in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the feeding and welding machine for electrical contact terminals in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the camera identifying the electrical contact terminal and the turntable rotating to adjust the circumferential angle of the electrical contact terminal.

[0021] Figure label: 100. Electrical contact terminal; 101. Pin body; 1011. Crimping part; 1012. Deformation hole; 1013. Guide part; 1014. Pin top surface; 102. Pin seat; 1021. Solder pad; 1022. Connecting post; 200, Circuit board; 300, Substrate; 400, Backing plate; 1. Angle correction device; 11. Turntable; 111. Positioning hole; 12. Recognition camera; 2. Welding joint; 3. Feeding device; 31. Vibrating feeder; 32. Material handling and conveying mechanism; 33. Tilting mechanism; 331. Turntable; 332. First suction nozzle; 34. Transfer mechanism; 341. Second suction nozzle; 342. Movable mounting base. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] The electrical contact terminal 100 is a Pressfit pin, including a pin body 101 and a pin seat 102, with the pin seat 102 connected to the first end of the pin body 101. A crimping portion 1011 is formed on the pin body 101, and a corresponding pin hole is provided on the circuit board 200. The crimping portion 1011 can be arranged in the pin hole of the circuit board 200. When the pin body 101 is inserted into the pin hole of the circuit board 200, the crimping portion 1011 on the pin body 101 is press-fitted with the circuit board 200, and the crimping portion 1011 undergoes cold deformation under pressure to form an electrical connection with the circuit board 200; thus, the electrical contact terminal 100 and the circuit board 200 are mechanically fixedly connected. The crimping portion 1011 is a protrusion formed on the pin body 101 and extending along the outer diameter direction of the pin body 101, used for crimping with the circuit board 200. A guide portion 1013 is formed on the end of the needle body 101 away from the needle holder 102. The guide portion 1013 is used to guide the circuit board 200 through the needle body 101. The needle holder 102 includes a solder pad 1021 for soldering and a connecting post 1022 connecting the needle body 101 and the solder pad 1021.

[0024] This invention provides a feeding and welding machine for electrical contact terminals 100, used to weld electrical contact terminals 100 onto a substrate 300, and ensuring that the crimping portion 1011 on the electrical contact terminal 100 faces a preset target direction. The feeding and welding machine includes a table, an angle correction device 1, and a welding head 2.

[0025] The table surface is used to place the substrate 300; the angle correction device 1 is used to keep the axial direction of the electrical contact terminal 100 perpendicular to the table surface and drive the electrical contact terminal 100 to rotate circumferentially until the protrusion direction of the crimping part 1011 is consistent with the preset target direction, so as to adjust and correct the circumferential angle of the electrical contact terminal 100; the welding head 2 is used to move the corrected electrical contact terminal 100 from the angle correction device 1 to the substrate 300 and weld the pin seat 102 of the electrical contact terminal 100 to the substrate 300.

[0026] Welding head 2 is welded using ultrasonic welding.

[0027] In this embodiment of the invention, the needle body 101 and the needle seat 102 are first fixedly connected to form an electrical contact terminal 100. Then, the angle of the electrical contact terminal 100 is adjusted and corrected so that the crimping portion 1011 on the electrical contact terminal 100 faces a preset target direction. Then, the welding head 2 moves the electrical contact terminal 100 onto the substrate 300 for welding. This ensures that the circumferential attitude angle deviation of the electrical contact terminal 100 on the substrate 300 is controlled within ±5°. When multiple electrical contact terminals 100 are welded onto the same substrate 300, the crimping portion 1011 on each electrical contact terminal 100 faces the same direction. When the circuit board 200 is connected to the crimping portion 1011 on the electrical contact terminal 100, the circuit board 200 is subjected to uniform force and the electrical contact is stable.

[0028] Furthermore, the needle holder 102 and the needle body 101 are pre-assembled before soldering the needle holder 102 to the substrate 300. If the needle holder 102 and the needle body 101 are damaged or deformed during the assembly process, they can be scrapped. Therefore, neither the substrate 300 will be damaged, nor will the verticality of the needle body 101 installed on the base be affected.

[0029] The needle body 101 has two crimping portions 1011, which are located on two pairs of sides perpendicular to the axial direction. A deformation hole 1012 is formed on the needle body 101 between the two crimping portions 1011. When the crimping portions 1011 are pressed against the inner wall of the pin hole in the circuit board 200, the two crimping portions 1011 are subjected to force and squeeze the deformation hole 1012, causing the deformation hole to deform adaptively. The crimping portions 1011 and the deformation hole 1012 form a fisheye shape. When the crimping portions 1011 on each electrical contact terminal 100 are oriented in the same direction, the deformation holes 1012 on each electrical contact terminal 100 are also oriented in the same direction.

[0030] The composition and working principle of the angle correction device 1 will be explained below.

[0031] The angle correction device 1 in this embodiment of the invention includes a turntable 11 and a detection unit.

[0032] The turntable 11 is provided with a positioning hole 111 for inserting the pin holder 102. The positioning hole 111 is coaxial with the rotation axis of the turntable 11 and is perpendicular to the table surface. When the substrate 300 is placed flat on the table surface, the axial direction of the positioning hole 111 is perpendicular to the substrate 300. When the pin holder 102 is coaxially inserted into the positioning hole 111, the axial direction of the electrical contact terminal 100 is perpendicular to the substrate 300 on the table. The turntable compensates for the rotation angle of the electrical contact terminal 100 according to the deviation of the orientation angle of the deformation hole.

[0033] The monitoring unit is connected to the controller. When the needle seat 102 is inserted into the positioning hole 111, the monitoring unit can monitor the electrical contact terminal 100 and transmit the data to the controller. During the process of the electrical contact terminal 100 rotating together with the turntable 11, when the protrusion direction of the crimping part 1011 is consistent with the preset target direction, the controller controls the turntable 11 to stop rotating.

[0034] The monitoring unit can be a recognition camera 12, with the recognition end of the recognition camera 12 facing the end face of the needle body 101 away from the needle seat 102.

[0035] As an optional implementation, the end of the needle body 101 away from the needle seat 102 is the identified end, and the outer contour of the end face of the identified end is non-circular; the identified end is identified by the identification camera 12 and an identification pattern is formed, and the computer compares the identification pattern with the target pattern; the controller controls the rotation angle of the servo motor according to the degree of deviation between the identification pattern and the target pattern, thereby rotating the electrical contact terminal 100 circumferentially until the identification pattern and the target pattern coincide, so that the protrusion direction of the crimping part 1011 is oriented towards the preset target direction, that is, the deformation hole 1012 on the electrical contact terminal 100 is oriented in the same direction.

[0036] The needle body 101 can be cylindrical or cuboid. The outer contour of the identified end face on the needle body 101 can be triangular, quadrilateral, or pentagonal.

[0037] The turntable 11 is provided with a negative pressure adsorption unit that communicates with the positioning hole 111 and is used to create a negative pressure in the positioning hole 111. The positioning hole 111 can adsorb the needle seat 102 through the negative pressure adsorption unit, preventing the needle seat 102 from rotating circumferentially relative to the positioning hole 111, so that the electrical contact terminal 100 rotates together with the turntable 11.

[0038] In this embodiment of the invention, a feeding device 3 is also provided upstream of the angle correction device 1. The feeding device 3 is used to adjust the electrical contact terminal 100 to the feeding posture and feed it into the positioning hole 111 of the turntable 11. In the feeding posture, the axial direction of the electrical contact terminal 100 is along the axial direction of the positioning hole 111.

[0039] The feeding device 3 will be described below.

[0040] The feeding device 3 includes a vibrating material tray 31, a material conveying mechanism 32, a tilting mechanism 33, and a transfer mechanism 34.

[0041] The vibrating tray 31 holds multiple electrical contact terminals 100 and discharges them via vibration. The material handling and conveying mechanism 32 receives the electrical contact terminals 100 from the vibrating tray 31 and sequentially handles and conveys them. The material handling and conveying mechanism 32 includes a guide trough communicating with the discharge port of the vibrating tray 31 and a material handling assembly disposed on the guide trough. When the electrical contact terminals 100 are conveyed along the guide trough to the discharge end of the material handling and conveying mechanism 32, the needle seat 102 on the electrical contact terminal 100 faces the flipping mechanism 33 on the downstream side, while the needle body 101 faces away from the flipping mechanism 33.

[0042] After the flipping mechanism 33 picks up the needle seat 102 from the discharge end of the material feeding mechanism 32, it flips the electrical contact terminal 100 as a whole to the feeding position, so that the axial direction of the electrical contact terminal 100 is along the axial direction of the positioning hole 111. Optionally, the flipping mechanism 33 includes a turntable 331 and a first suction nozzle 332. The turntable 331 can rotate around its own axis, and the rotation axis of the turntable 331 is perpendicular to the rotation axis of the turntable 11. The first suction nozzle 332 is disposed on the peripheral wall of the turntable 331 and extends radially along the turntable 331. The first suction nozzle 332 has a suction position and a discharge position, and reciprocates between the suction position and the discharge position under the drive of the turntable 331. When the first suction nozzle 332 moves to the suction position near the end of the material conveying mechanism 32, the first suction nozzle 332 faces the needle seat 102 on the end of the material conveying mechanism 32, and the first suction nozzle 332 picks up the needle seat 102 to pick up the entire electrical contact terminal 100. The first suction nozzle 332 moves to the discharge position under the drive of the turntable 331. At this time, the first suction nozzle 332 rotates with the turntable 331 by a preset angle and flips the electrical contact terminal 100 to the feeding posture. The inner diameter of the first suction nozzle 332 is matched with the outer diameter of the needle holder 102. The first suction nozzle 332 picks up or releases the electrical contact terminal 100 by sucking up or releasing the needle holder 102.

[0043] The transfer mechanism 34 is configured to transfer the electrical contact terminal 100 in the loading posture from the flipping mechanism 33 to the positioning hole 111 of the turntable 11. The transfer mechanism 34 includes a second suction nozzle 341 and a movable mounting base 342. The second suction nozzle 341 is used to pick up or release the needle body 101; the movable mounting base 342 is used to drive the second suction nozzle 341 to reciprocate between directly above the discharge position and directly above the positioning hole 111 of the turntable 11. When the second suction nozzle 341 moves to directly above the discharge position, the first suction nozzle 332 releases the needle seat 102, and the second suction nozzle 341 picks up the needle body 101 to pick up the electrical contact terminal 100. When the second suction nozzle 341 moves to directly above the positioning hole 111 after picking up the needle body, the second suction nozzle 341 releases the needle body 101, so that the needle seat 102 extends into the positioning hole 111.

[0044] The basic working principle of the feeding and welding machine for the electrical contact terminal 100 in this embodiment of the invention is as follows: The vibrating feeder 31 feeds the electrical contact terminals 100 into the guide trough via vibration. The material handling assembly handles the electrical contact terminals 100 so that when the electrical contact terminals 100 are conveyed along the guide trough to the discharge end of the material handling conveying mechanism 32, the needle seat 102 on the electrical contact terminals 100 faces the flipping mechanism 33, while the needle body 101 faces away from the flipping mechanism 33. The first suction nozzle 332 moves to the suction position under the drive of the turntable 331. The first suction nozzle 332 faces the needle seat 102 located at the end of the guide trough and picks up the needle seat 102 to pick up the entire electrical contact terminal 100. The turntable 331 rotates 90° to move the first suction nozzle 332 to the discharge position and flip the electrical contact terminals 100 to the feeding posture. At this time, the needle seat 102 is located above the needle body 101. The second suction nozzle 341 picks up the needle body 101 longitudinally, thereby picking up the entire electrical contact terminal 100; after picking up the material, the second suction nozzle 341 moves to directly above the positioning hole 111 and releases the needle body 101, so that the needle seat 102 below the needle body 101 falls into the positioning hole 111.

[0045] The negative pressure environment formed within the positioning hole 111 attracts the needle holder 102, ensuring that the electrical contact terminal 100 and the turntable 11 are relatively fixed. The turntable 11 is driven to rotate by a servo motor, causing the electrical contact terminal 100 to rotate with the turntable 11. This rotation of the electrical contact terminal 100 adjusts the orientation of the protrusion of its crimping portion 1011. The recognition camera 12 takes a picture of the electrical contact terminal 100 and identifies the offset angle of the top surface shape of the needle body 101 until the protrusion of the crimping portion 1011 is aligned with the preset target direction, at which point the servo motor stops. The welding head 2 picks up the needle body 101 from the turntable 11 to collect the entire electrical contact terminal 100, translates the electrical contact terminal 100 onto the substrate 300, and then welds the needle holder 102 to the base.

[0046] This invention also provides a feeding and welding method for an electrical contact terminal 100, which includes the following steps: S100: Load the electrical contact terminal 100 onto the angle correction device 1, and make the axial direction of the loaded electrical contact terminal 100 perpendicular to the substrate 300. S200: The angle correction device 1 drives the electrical contact terminal 100 to rotate circumferentially until the protrusion direction of the crimping part 1011 is consistent with the preset target direction. S300: Move the electrical contact terminal 100 onto the substrate 300 and solder the pin seat 102 of the electrical contact terminal 100 onto the substrate 300.

[0047] Furthermore, steps S100 to S300 are sequentially performed on the same substrate 300 and repeated multiple times, thereby welding multiple electrical contact terminals 100 onto the same substrate 300, and the orientation of the crimping portion 1011 on each electrical contact terminal 100 is consistent, that is, the orientation of the deformation hole 1012 on the electrical contact terminal 100 is consistent.

[0048] In the first embodiment, the end of the needle body 101 away from the needle seat 102 is the identified end, and the outer contour of the end face of the identified end is non-circular; step S200 also includes the following steps: using the identification camera 12 to identify the identified end and form an identification pattern, using a computer to compare the identification pattern with the target pattern; rotating the electrical contact terminal 100 according to the degree of deviation between the identification pattern and the target pattern until the identification pattern and the target pattern coincide, so that the protrusion direction of the crimping part 1011 faces the preset target direction.

[0049] As a second implementation, the recognition camera 12 is used to identify the target mark on the table and a target coordinate system is established based on the target mark; the outer contour of the needle body 101 away from the needle seat 102 is non-circular, and a mark point is set at the top corner of the non-circular end; step S200 also includes the following steps: using the recognition camera 12 to identify the mark point and determine the coordinates of the mark point in the target coordinate system; rotating the electrical contact terminal 100 according to the positional deviation between the coordinates of the mark point and the target coordinates so that the mark point is aligned with the target mark, thereby making the protrusion direction of the crimping part 1011 face the preset target direction.

[0050] Optionally, after the electrical contact terminal 100 is fed onto the turntable 11, a vacuum negative pressure is formed in the positioning hole 111 to adsorb and limit the needle seat 102, preventing the electrical contact terminal 100 from deviating at an angle during rotation. After feeding, the recognition camera 12 takes a picture of the electrical contact terminal 100 and establishes a coordinate system for the electrical contact terminal 100 based on the shape of the needle top surface 1013. When the shape of the needle top surface 1013 is rectangular, the coordinate system of the electrical contact terminal 100 is obtained by taking the center of the rectangle as the origin, the long side of the rectangle as the X' axis, and the short side of the rectangle as the Y' axis. The computer automatically calculates the angle deviation between the coordinate system of the electrical contact terminal 100 and the target coordinate system established according to the frame, and obtains the angle deviation of the crimping part 1011 of the electrical contact terminal 100. The turntable 11 rotates to compensate for the calculated angle deviation, so that the coordinate system of the electrical contact terminal 100 is consistent with the X and Y axes of the machine coordinate system, thereby ensuring that the crimping parts 1011 of each electrical contact terminal 100 are oriented in the same direction.

[0051] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A feeding and welding machine for electrical contact terminals, characterized in that, The electrical contact terminal includes a pin holder and a pin body connected to the pin holder. The pin body has a crimping portion that protrudes along its outer diameter and is used for crimping with the circuit board. The feeding and welding machine includes: A shelf, the surface of which is used to place the substrate; An angle correction device is used to keep the axial direction of the electrical contact terminal perpendicular to the platform surface and drive the electrical contact terminal to rotate circumferentially until the protrusion direction of the crimping part is consistent with the preset target direction, so as to adjust and correct the circumferential angle of the electrical contact terminal; and A welding head is used to move the corrected electrical contact terminal from the angle correction device to the substrate and weld the pin seat of the electrical contact terminal to the substrate.

2. The feeding and welding machine according to claim 1, characterized in that, The angle correction device includes: A turntable is provided with a positioning hole for inserting the needle seat. The positioning hole is coaxial with the rotation axis of the turntable and is perpendicular to the table surface of the storage platform. The monitoring unit is connected to the controller. When the needle seat is inserted into the positioning hole, the monitoring unit can monitor the electrical contact terminal and transmit the data to the controller. During the rotation of the electrical contact terminal with the turntable, when the protrusion direction of the crimping part is consistent with the preset target direction, the controller controls the turntable to stop rotating.

3. The feeding and welding machine according to claim 2, characterized in that, The turntable is provided with a negative pressure adsorption unit that communicates with the positioning hole and is used to create a negative pressure in the positioning hole; The positioning hole can be used to negatively adsorb the needle holder through the negative pressure adsorption unit, restricting the circumferential rotation of the needle holder relative to the positioning hole, so that the electrical contact terminal rotates together with the turntable.

4. The feeding and welding machine according to claim 2, characterized in that, An upstream device for feeding is provided for adjusting the electrical contact terminal to the feeding posture and feeding it into the positioning hole of the turntable. In the loading posture, the axial direction of the electrical contact terminal is along the axial direction of the positioning hole.

5. The feeding and welding machine according to claim 4, characterized in that, The feeding device includes: The material feeding and conveying mechanism is used to sequentially feed and convey electrical contact terminals; The flipping mechanism is configured to pick up an electrical contact terminal from the discharge end of the material feeding and conveying mechanism and flip the picked-up electrical contact terminal to the loading posture; The transfer mechanism is configured to transfer the electrical contact terminals in the loading posture from the flipping mechanism to the positioning hole of the turntable.

6. The feeding and welding machine according to claim 5, characterized in that, The flipping mechanism includes: The turntable is rotatable about its own axis, and the axis of rotation of the turntable is perpendicular to the axis of rotation of the turntable. A first suction nozzle is disposed on the peripheral wall of the turntable and extends radially along the turntable; the first suction nozzle has a suction position and a discharge position, and reciprocates between the suction position and the discharge position under the drive of the turntable; When the first suction nozzle moves to a suction position near the end of the material feeding mechanism, the first suction nozzle picks up the electrical contact terminal from the end of the material feeding mechanism. When the first suction nozzle moves to the discharge position, the first suction nozzle rotates at a preset angle with the turntable and flips the electrical contact terminal to the feeding posture.

7. The feeding and welding machine according to claim 6, characterized in that, The inner diameter of the first suction nozzle matches the outer diameter of the needle holder. The first suction nozzle picks up or releases the electrical contact terminal by sucking up or releasing the needle holder.

8. The feeding and welding machine according to claim 6 or 7, characterized in that, The transfer mechanism includes: The second suction nozzle is used to draw in or release the needle body; The movable mounting base is used to drive the second suction nozzle to reciprocate between directly above the discharge position and directly above the positioning hole of the turntable; When the second suction nozzle moves to directly above the discharge position, the first suction nozzle releases the needle seat, and the second suction nozzle picks up the needle body to retrieve the electrical contact terminal. When the second suction nozzle picks up material and moves directly above the positioning hole, the second suction nozzle releases the needle body, allowing the needle seat to extend into the positioning hole.

9. A method for feeding and soldering electrical contact terminals, characterized in that, The electrical contact terminal has a pressing portion that protrudes outward along a direction perpendicular to the axial direction, the pressing portion being used for pressing with the circuit board; the feeding and soldering method includes the following steps: S100: Load the electrical contact terminal onto the angle correction device, and make the axial direction of the loaded electrical contact terminal perpendicular to the substrate; S200: The angle correction device drives the electrical contact terminal to rotate circumferentially until the protrusion direction of the crimping part is consistent with the preset target direction; S300: Move the electrical contact terminal onto the substrate and solder the pin seat of the electrical contact terminal onto the substrate.

10. The feeding and welding method according to claim 9, characterized in that, Steps S100 to S300 are sequentially performed on the same substrate and repeated multiple times to solder multiple electrical contact terminals onto the same substrate, with the crimping portions on each electrical contact terminal facing the same direction.

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