Positioning and clamping device for circuit board welding processing and method thereof

Abstract

The application discloses a positioning and clamping device for circuit board welding processing and a method thereof. The positioning and clamping device comprises a base, a table top and a clamping mechanism. The clamping mechanism is arranged on both sides of the table top. The clamping mechanism comprises a linear motion mechanism and a clamping plate. The clamping plate is connected with the linear motion mechanism. The linear motion mechanism drives the clamping plate to move linearly on the table top. A contact switch is arranged on the contact surface of the clamping plate. The linear motion mechanism and the clamping plate realize mechanical clamping. The circuit board is positioned at the middle position of the table top. The welding process is carried out on the basis, the precision and accuracy of welding are improved, the welding quality is improved, the mechanical positioning and clamping device saves time and effort, speeds up the welding process, and reduces the labor cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of circuit board welding processing, and particularly relates to a positioning and clamping device for circuit board welding processing and a method thereof. BACKGROUND

[0002] Welding, also known as soldering, is a manufacturing process and technology that joins metal or other thermoplastic materials such as plastic by heating, high temperature or high pressure. There are many energy sources for modern welding, including gas flame, electric arc, laser, electron beam, friction and ultrasonic wave, etc. In addition to being used in factories, welding can also be carried out in various environments, such as outdoors, underwater and in space. No matter where, welding can pose a risk to the operator, so appropriate protective measures must be taken when welding. The injuries that welding can cause to the human body include burns, electric shock, vision impairment, inhalation of toxic gases, excessive ultraviolet radiation, etc.

[0003] In the processing of circuit boards, welding is an extremely important processing technology. Before welding, it is often necessary to pre-position and fix to avoid problems such as welding misplacement and deviation. At present, there is no mechanized positioning and clamping method in the welding processing of circuit boards, and there is also a lack of mechanized positioning and clamping equipment, and most rely on conventional positioning and fixing methods, which have the problems of low precision, time-consuming and labor-intensive. It is difficult to implement in a pipeline welding process. SUMMARY

[0004] The purpose of the present application is to provide a positioning and clamping device for circuit board welding processing and a method thereof. In view of the defects in the prior art, a mechanized positioning and clamping device is designed. The circuit board on the table is clamped mechanically by the synchronous movement of the clamping mechanisms on both sides, and the circuit board is positioned in the middle of the table. On this basis, the welding process is carried out, which improves the precision and accuracy of welding, improves the welding quality, and the mechanized positioning and clamping equipment and method save time and effort, and speed up the welding process.

[0005] In order to solve the above technical problems, the following technical solutions are adopted:

[0006] A positioning and clamping device for circuit board welding processing, comprising a base, a table and a clamping mechanism, characterized in that: the two sides of the table are respectively provided with clamping mechanisms, the clamping mechanism comprises a linear motion mechanism and a clamping plate, the clamping plate is connected to the linear motion mechanism, the linear motion mechanism drives the clamping plate to move linearly on the table, and the contact surface of the clamping plate is provided with a contact switch.

[0007] Further, the linear motion mechanism comprises a linear cylinder, a connecting rod and a push plate, the linear cylinder is connected with the connecting rod through a first piston rod, the connecting rod is connected with the push plate, and the push plate is connected with the clamping plate. The linear cylinder serves as a power source for linear motion and can drive the connecting rod, the push plate and the clamping plate to move linearly in an orderly manner, so as to clamp or release the circuit board. This driving mode is direct and effective, and is convenient to control.

[0008] Further, the linear motion mechanism further comprises a linear bearing box, the linear bearing box is connected with the push plate through a guide shaft, and the linear motion mechanism is provided with two linear bearing boxes. The linear bearing box has a linear guiding effect, so that the linear motion of the connecting rod, the push plate and the clamping plate is more stable. On the other hand, the linear bearing box plays an auxiliary supporting role, reduces the supporting pressure of the linear cylinder, and makes the whole linear motion mechanism more stable.

[0009] Further, the clamping plate is L-shaped and is fixed to the push plate through bolts. The contact surface of the clamping plate is formed with a clamping opening, the height of the clamping opening matches the height of the circuit board, a contact switch is arranged at the clamping opening, an edge pressing member is arranged at the upper end of the clamping opening, and the edge pressing member is connected through a spring. The clamping opening can engage the edge of the circuit board to improve the clamping and positioning effect, and the circuit board is more stable. The edge pressing member presses the edge of the circuit board by means of the rebound force of the spring, further improves the clamping and positioning effect, and has strong anti-impact force.

[0010] Further, the base is provided with a lifting cylinder, the lifting cylinder is connected with a table bottom plate through a second piston rod, and the table bottom plate is connected with a table. The lifting cylinder gives the clamping and positioning device a lifting function, and the belt conveying line can complete a flow line type clamping and positioning operation, which significantly improves the welding efficiency and accuracy of the circuit board.

[0011] Further, the lifting cylinder is further provided with a sensing positioning mechanism, the sensing positioning mechanism comprises a travel switch assembly, a proximity switch assembly, a sensing sheet and a mounting rod, the travel switch assembly is arranged at the upper and lower portions of the mounting rod, the proximity switch assembly is arranged between the travel switch assemblies, the travel switch assembly and the proximity switch assembly sense the sensing sheet, the sensing sheet is mounted on the second piston rod or the table bottom plate, and the mounting rod is arranged close to the sensing sheet. The sensing positioning mechanism is used to position the lifting position of the table. According to each lifting position, each process of clamping and positioning is sequentially carried out to achieve the purpose of flow line type clamping and positioning and improve the stability of the process.

[0012] The positioning and clamping method of the positioning and clamping device is characterized in that the positioning and clamping device is used in cooperation with a circuit board conveying line, the circuit board conveying line adopts a belt conveying line, the belt conveying line is based on a chain conveying line, the two chains are replaced with narrow belts, the positioning and clamping device is sequentially arranged on the belt conveying line, and the positioning and clamping method comprises the following steps.

[0013] (1) First lifting: lifting cylinder lifting starts, the table rises, the circuit board on the belt conveying line is lifted and positioned to a certain height during the lifting process, and the lifting cylinder is closed;

[0014] (2) Clamping and positioning: the clamping mechanisms on both sides are simultaneously started, the clamping plates move synchronously, the circuit board is clamped and positioned to the middle position of the table;

[0015] (3) Second lifting: the lifting cylinder is started again, the table rises to the welding height, and the lifting cylinder is closed;

[0016] (4) Descending and resetting: after the set welding time, the lifting cylinder is started to descend, the clamping mechanism is reset during the descending process of the table, the circuit board falls back to the belt conveying line, and the table descends to the initial position, and the lifting cylinder is closed.

[0017] After optimization, according to the installation position of the clamping and positioning device, an infrared emitter is arranged below the belt conveying line, and an infrared receiver is arranged on the upper welding gun rack. When the circuit board reaches the position of the infrared emitter and the infrared receiver, the infrared signal is blocked, at which time the belt conveying line stops running, and this is used as a signal for starting the current clamping and positioning action. After resetting in step (4), the belt conveying line is started again, and the next circuit board enters again for clamping and positioning, and the cycle is repeated. The present application uses an infrared emitter and an infrared receiver to identify the position of the circuit board on the belt conveying line. When the infrared receiver cannot receive the infrared signal, it is determined that the circuit board has entered the welding area and blocked the infrared emitter, which is used as a welding signal, so as to accurately lift the circuit board. Based on the above method, workers do not need to monitor and manually control the clamping and positioning device in real time, which saves time and effort and improves the efficiency of welding.

[0018] Further, during the clamping and positioning process in step (2), the clamping plates on both sides move synchronously at the same speed under the control of the linear motion mechanism, and the clamping plates on both sides always maintain a relative position. During the movement, the circuit board is gradually pushed to the center position of the table, and finally clamped. In the clamped state, the contact switches of the clamping plates on both sides are pressed at the same time as the clamping and positioning completion signal, and the linear cylinder is closed. During the clamping and positioning process, the starting points of the clamping plates on both sides are opposite to each other, and move synchronously at the same speed, so that the clamping plates on both sides always maintain an opposite position. In this way, the circuit board that is deviated to the left or right can be corrected to the middle position, so as to accurately align the welding gun. The clamping and positioning completion signal is determined by the simultaneous pressing of the contact switches on both sides. This situation only occurs after the clamping and positioning is completed, and can be accurately determined.

[0019] After optimization, the descending and resetting process in step (4) includes a non-stopping mode and a stopping mode:

[0020] Non-stopping mode: the lifting cylinder is started to descend, the table gradually descends, the synchronous clamping mechanism starts to reset, when passing through the belt conveying line, the circuit board is separated from the clamping, and falls back to the belt conveying line; after the table descends to the initial position, the lifting cylinder is closed.

[0021] Stopping mode: the lifting cylinder is started to descend, the table gradually descends, when descending to the positioning height, the lifting cylinder is closed, the clamping mechanism starts to reset; after the set reset time, the lifting cylinder is started to descend again, when passing through the belt conveying line, the circuit board is separated from the clamping, and falls back to the belt conveying line; after the table descends to the initial position, the lifting cylinder is closed.

[0022] The non-stopping mode can quickly reset, speed up, and improve efficiency; the stopping mode is relatively more stable, gradually resets in order, and has a lower probability of failure and problems.

[0023] In order to solve the above technical problems, the following technical solutions are adopted:

[0024] The present application is a kind of positioning and clamping device for circuit board welding and its method, aiming at the defects in the prior art, a mechanized positioning and clamping device is designed, which mechanically clamps the circuit board on the table through the synchronous movement of the clamping mechanism on both sides, and positions the circuit board in the middle of the table. On this basis, the welding process is carried out, the precision and accuracy of welding are improved, the welding quality is improved, and the mechanized positioning and clamping device saves time and effort and speeds up the welding process. Its specific beneficial effects are as follows:

[0025] 1. The positioning and clamping device mechanically clamps through the linear motion mechanism and the clamping plate, positions the circuit board in the middle of the table, and carries out the welding process on this basis, improves the precision and accuracy of welding, improves the welding quality, and the mechanized positioning and clamping device saves time and effort and speeds up the welding process, reduces labor cost.

[0026] 2. The contact switch is used to determine the end of clamping to prevent the clamping mechanism from continuously applying force and damaging the circuit board, and the design is ingenious.

[0027] 3. The clamping plate can engage the edge of the circuit board through the clamping opening to improve the clamping and positioning effect, and the circuit board is more stable. The edge piece tightly presses the edge of the circuit board with the help of the spring rebound force, further improving the clamping and positioning effect and the anti-impact ability.

[0028] 4. The present application gives the clamping and positioning device lifting function through the lifting cylinder, and can complete the assembly line type clamping and positioning operation with the belt conveying line, which significantly improves the welding efficiency and welding accuracy of the circuit board.

[0029] 5. In the clamping and positioning process of this invention, the starting points of the clamping plates on both sides are opposite each other and move synchronously at the same speed, thereby keeping the clamping plates on both sides in a left-right opposite position. In this way, the circuit board that is deviated to the left or right will be corrected to the center position, thus accurately aligning with the welding gun. The clamping and positioning completion signal is indicated by the simultaneous pressing of the contact switches on both sides. This situation will only occur after the positioning and clamping are completed, allowing for precise determination. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the positioning and clamping device of the present invention;

[0032] Figure 2 This is a schematic diagram of the countertop;

[0033] Figure 3 This is a connection diagram of the clamping mechanism;

[0034] Figure 4 This is a schematic diagram of the clamping plate.

[0035] Figure 5 for Figure 4 Enlarged schematic diagram of point I in the middle;

[0036] Figure 6 This is a schematic diagram of the installation of the positioning and clamping device on the belt conveyor line.

[0037] Figure 7 This is a schematic diagram of a belt conveyor line viewed from above. Detailed Implementation

[0038] This invention provides a positioning and clamping device for circuit board soldering, and a positioning and clamping method of the positioning and clamping device, which will now be described in detail:

[0039] like Figures 1 to 5 As shown, a positioning and clamping device for circuit board soldering includes a base 1, a table 2, and a clamping mechanism. The base 1 is used to mount the table 2, and the clamping mechanism is mounted on the table 2.

[0040] A lifting cylinder 3 is installed on the base 1. The lifting cylinder 3 is connected to the table base plate 5 through the second piston rod 4, and the table base plate 5 is connected to the table 2. The lifting cylinder 3 enables the clamping and positioning device to lift, and in conjunction with the belt conveyor 21, it can complete the assembly line clamping and positioning operation, which significantly improves the efficiency and accuracy of circuit board soldering.

[0041] The lifting cylinder 3 is also equipped with an induction positioning mechanism, which includes two travel switch assemblies 14, three proximity switch assemblies 15, an induction sheet 12 and a mounting rod 13. The two travel switch assemblies 14 are respectively arranged at the upper and lower parts of the mounting rod 13, and are used to limit the maximum stroke range of the lifting cylinder 3. The proximity switch assemblies 15 are arranged between the travel switch assemblies 14, and the three proximity switches are arranged in sequence from top to bottom, and correspond to three set lifting positions respectively, so as to cooperate with the positioning and clamping operation of the positioning and clamping device. The travel switch assemblies 14 and the proximity switch assemblies 15 can sense the induction sheet 12, so as to obtain the position information of the lifting. The induction sheet 12 is connected to the table bottom plate 5 through a long connecting rod 12, and can be lifted together with the lifting table 2. The mounting rod 13 is arranged close to the induction sheet 12. The induction positioning mechanism is used to position the lifting position of the table 2, and according to each lifting position, each process of clamping and positioning is sequentially carried out, so as to achieve the purpose of assembly line clamping and positioning, and improve the stability of the process.

[0042] The clamping mechanism is arranged on both sides of the table 2, that is, one clamping mechanism is arranged on each of the left and right sides. The clamping mechanism includes a linear motion mechanism and a clamping plate 9. The linear motion mechanism is installed below the table 2 and is connected to the clamping plate 9. The clamping plate 9 is located above the table 2. The linear motion mechanism drives the clamping plate 9 to move linearly on the table 2.

[0043] The linear motion mechanism includes a linear cylinder 16, a connecting rod 17 and a push plate 8. The linear cylinder 16 is connected to the connecting rod 17 through a first piston rod 10. The connecting rod 17 is connected to the push plate 8. The push plate 8 is connected to the clamping plate 9. The linear cylinder 16 serves as a power source for linear motion, and can drive the connecting rod 17, the push plate 8 and the clamping plate 9 to move linearly in an orderly manner, so as to achieve the purpose of clamping or releasing the circuit board. This driving mode is direct and effective, and is convenient to control.

[0044] The linear motion mechanism also includes a linear bearing box 6. The linear bearing box 6 is connected to the push plate 8 through a guide shaft 7. The linear motion mechanism is provided with two linear bearing boxes 6 (as shown in Figure 3 The linear bearing box 6 has a linear guiding effect, so that the linear motion of the connecting rod 17, the push plate 8 and the clamping plate 9 is more stable. On the other hand, the linear bearing box 6 plays an auxiliary supporting role, reduces the supporting pressure of the linear cylinder, and makes the whole linear motion mechanism more stable.

[0045] The clamping plate 9 is L-shaped and is fixed to the push plate 8 through bolts, a contact surface of the clamping plate 9 is formed with a clamping opening 19, the height of the clamping opening 19 matches the height of the circuit board, a contact switch 20 is arranged at the clamping opening 19, an edge pressing piece 18 is arranged at the upper end of the clamping opening 19, and the edge pressing piece 18 is connected through a spring. The edge of the circuit board can be clamped through the clamping opening 19 to improve the clamping and positioning effect, and the circuit board is more stable. The edge of the circuit board is pressed by the rebound force of the spring of the edge pressing piece 18, and the clamping and positioning effect is further improved, and the anti-external force impact capability is strong. The contact switch 20 is used to determine the end of clamping, so as to prevent the clamping mechanism from continuously applying force and damaging the circuit board, and the design is ingenious.

[0046] The positioning and clamping device provided by the application realizes mechanical clamping through a linear motion mechanism and a clamping plate 9, and enables the circuit board to be positioned at the middle position of the table top 2, so that the welding process is carried out on this basis, the precision and accuracy of welding are improved, the welding quality is improved, and the mechanical positioning and clamping device saves time and effort, speeds up the welding process, and reduces labor costs.

[0047] As shown in Figures 1 to 7 The positioning and clamping method of the positioning and clamping device comprises the following steps:

[0048] The positioning and clamping device is used in cooperation with a circuit board conveying line, the circuit board conveying line adopts a belt conveying line 21, the belt conveying line 21 is based on a chain conveying line, the chains on the two sides are replaced with narrow belts 24, the two ends of the circuit board are respectively arranged on the corresponding belts 24, and the circuit board is transported through the rotation of the belts 24. The belt conveying line 21 is one kind of belt conveying line 21, and is a conventional conveying line. The width of the belt conveying line 21 matches the length of the circuit board, and the circuit board can be exactly arranged on the belt conveying line 21.

[0049] The positioning and clamping devices are sequentially arranged on the belt conveying line 21, the area where the belt conveying line 21 is arranged with the positioning and clamping devices is provided with supporting legs 23, the supporting legs 23 are connected with a horizontal rod 25, the horizontal rod 25 is connected with the fixed mounting rod 13 to match the inductive sheet 12 on the positioning and clamping device.

[0050] According to the installation position of the clamping and positioning device, an infrared emitter 26 is arranged below the belt conveying line 21, and an infrared receiver 27 is arranged on the welding gun rack 22 above, and the infrared receiver 27 is used to receive the infrared light emitted by the infrared emitter 26.

[0051] Based on the above structure, the positioning and clamping method comprises the following steps:

[0052] (1) When the circuit board enters the welding position, the front end of the circuit board is in the same vertical plane as the infrared emitter 2 and the infrared receiver 27, blocking the reception of the infrared signal, at which time the belt conveying line 21 stops running and serves as the signal for starting the current clamping positioning action; the present application uses the infrared emitter 26 and the infrared receiver 27 to identify the position of the circuit board on the belt conveying line 21, and when the infrared receiver 27 cannot receive the infrared signal, it is determined that the circuit board has entered the welding area and blocked the infrared emitter 26, which serves as the welding signal, thereby achieving the purpose of accurately lifting the circuit board. Based on the above method, there is no need for workers to monitor and manually control the clamping positioning device in real time, saving time and effort and improving the efficiency of welding.

[0053] (2) First lifting: the output position of the table top 2 corresponds to the lowest proximity switch assembly 15 (i.e. the sensing sheet 12 is aligned with the proximity switch assembly 15), the lifting cylinder 3 is started to rise, the table top 2 rises, and in the rising process, the circuit board on the belt conveying line 21 is lifted and lifted to the positioning height, corresponding to the middle proximity switch assembly 15 (i.e. the sensing sheet 12 is aligned with the proximity switch assembly 15), the lifting cylinder 3 is closed;

[0054] (3) Clamping positioning: the clamping plates 9 on both sides move synchronously at the same speed under the control of the linear motion mechanism, and the clamping plates 9 on both sides always maintain a relative position, gradually pushing the circuit board to the center position of the table top 2 during the movement, and finally clamping; in the clamping state, the contact switches 20 of the clamping plates 9 on both sides are pressed at the same time as the clamping positioning completion signal, and the linear cylinder 16 is closed. During the clamping positioning process, the starting points of the clamping plates 9 on both sides are opposite to each other, moving synchronously at the same speed, so that the clamping plates 9 on both sides always remain in opposite positions, thereby correcting the circuit board that is deviated to the left or right to the middle position, thereby accurately aligning the welding gun. The clamping positioning completion signal is determined by the simultaneous pressing of the contact switches 20 on both sides, which only occurs after the positioning and clamping are completed, and can be accurately determined.

[0055] (4) Second lifting: the lifting cylinder 3 is started to rise again, the table top 2 rises to the welding height, corresponding to the highest proximity switch assembly 15 (i.e. the sensing sheet 12 is aligned with the proximity switch assembly 15), the lifting cylinder 3 is closed, and the welding operation begins;

[0056] (5) Descending reset: after the set welding time, the welding is completed, the lifting cylinder 3 is started to descend, and the descending reset begins, including the non-stop mode and the stop mode:

[0057] Non-stop mode: the lifting cylinder 3 is started to descend, the table top 2 gradually descends, and the synchronous clamping mechanism begins to reset, when passing through the belt conveying line 21, the circuit board has been released from the clamping and falls back to the belt conveying line 21; after the table top 2 descends to the initial position, the lifting cylinder 3 is closed.

[0058] Stay mode: the lifting cylinder 3 is started to drop, the table 2 is gradually lowered, when it is lowered to the positioning height, the lifting cylinder 3 is closed, the clamping mechanism starts to return to reset; after the set return reset time, the lifting cylinder 3 is started to drop again, when it passes the belt conveying line 21, the circuit board has been separated from the clamping, and falls back to the belt conveying line 21; after the table 2 is lowered to the initial position, the lifting cylinder 3 is closed.

[0059] The above non-stay mode can quickly return to reset, speed up and improve efficiency; and the stay mode is relatively more stable, gradually and orderly returns to reset, and the probability of failure and problems is relatively low.

[0060] (6) After the lowering reset, the belt conveying line 21 is started again, after the next circuit board enters, clamping and positioning are carried out again, steps (2) to (5) are repeated, and the circulation is realized, so that the positioning and clamping in the pipeline mode are realized, and the welding operation in the pipeline mode is realized.

[0061] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited thereto. Any simple change, equivalent replacement or modification made on the basis of the present application to solve the basically same technical problem and realize the basically same technical effect is covered in the protection scope of the present application.

Claims

1. A positioning and clamping device for circuit board soldering, comprising a base, a table, and a clamping mechanism, characterized in that: The clamping mechanisms are respectively arranged on both sides of the platform. Each clamping mechanism includes a linear motion mechanism and a clamping plate. The clamping plate is connected to the linear motion mechanism, which pushes the clamping plate to move linearly on the platform. A contact switch is installed on the contact surface of the clamping plate. The linear motion mechanism includes a linear cylinder, a connecting rod, and a push plate. The linear cylinder is connected to the connecting rod via a first piston rod, the connecting rod is connected to the push plate, and the push plate is connected to the clamping plate. The linear motion mechanism also includes a linear bearing housing, which is connected to the push plate via a guide shaft. The linear motion mechanism has two linear bearing housings. The clamping plate is L-shaped and fixed to the push plate with bolts. The contact surface of the clamping plate forms a clamping opening. The height of the clamp is matched with the height of the circuit board. The contact switch is provided at the clamp. A pressing edge is provided at the upper end of the clamp, and the pressing edge is connected by a spring. The base is provided with a lifting cylinder. The lifting cylinder is connected to the table base plate through a second piston rod. The table base plate is connected to the table. The lifting cylinder is also equipped with a sensing and positioning mechanism. The sensing and positioning mechanism includes a limit switch assembly, a proximity switch assembly, a sensing plate, and a mounting rod. The limit switch assembly is located at the upper and lower parts of the mounting rod. The proximity switch assembly is located between the limit switch assemblies. The limit switch assembly and the proximity switch assembly sense the sensing plate. The sensing plate is mounted on the second piston rod or the table base plate. The mounting rod is located close to the sensing plate. This positioning and clamping device is used in conjunction with a circuit board conveyor line, which is a belt conveyor line based on a chain conveyor line. The chains on both sides are replaced with narrow belts. The positioning and clamping devices are arranged in an orderly manner on the belt conveyor line, and the positioning and clamping method includes the following steps: (1) One-time lifting: The lifting cylinder starts to lift, the platform rises, the circuit board on the belt conveyor is lifted during the lifting process and lifted to the positioning height, and the lifting cylinder is closed. (2) Clamping and positioning: The clamping mechanisms on both sides start simultaneously, the clamping plates move synchronously, clamp the circuit board, and position it in the middle of the table; (3) Secondary rise: The lifting cylinder starts to rise again, the table rises to the welding height, and the lifting cylinder closes; (4) Descending and Resetting: After the set welding time, the lifting cylinder starts descending. During the descent of the table, the clamping mechanism retracts and resets, and the circuit board falls back to the belt conveyor. After the table descends to the initial position, the lifting cylinder closes. The descent and resetting process includes a non-stop mode and a stop mode. Non-stop mode: The lifting cylinder starts to descend, the platform gradually descends, and the clamping mechanism starts to return to its original position. When passing the belt conveyor, the circuit board has been released from the clamp and falls back onto the belt conveyor. Once the platform has descended to its initial position, the lifting cylinder will shut off. Dwell Mode: The lifting cylinder starts to descend, and the platform gradually descends. When it reaches the positioning height, the lifting cylinder closes, and the clamping mechanism begins to retract and reset. After the set retraction and reset time, the lifting cylinder starts to descend again. When passing the belt conveyor, the circuit board has been disengaged from the clamp and falls back onto the belt conveyor. After the platform descends to the initial position, the lifting cylinder closes. According to the installation position of the clamping and positioning device, an infrared transmitter is set below the belt conveyor and a corresponding infrared receiver is set on the welding gun frame above. When the circuit board reaches the position of the infrared transmitter and the infrared receiver, the reception of the infrared signal is blocked. At this time, the belt conveyor stops running and is used as the signal to start the current clamping and positioning action. After the reset in step (4), the belt conveyor starts again. After the next circuit board enters, the clamping and positioning is performed again, and so on.

2. The positioning and clamping device for circuit board welding processing according to claim 1, characterized in that: During the clamping and positioning process in step (2), the clamping plates on both sides move synchronously at the same speed under the control of the linear motion mechanism. The clamping plates on both sides keep their positions relative at all times. During the movement, the circuit board is gradually pushed to the center of the table and finally clamped. In the clamping state, the contact switches of the clamping plates on both sides are pressed at the same time as a clamping and positioning completion signal, and the linear cylinder is closed.

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