Reworking welding equipment and welding method for laminated circuit board production

Abstract

The invention relates to the technical field of laminated circuit board welding, and particularly discloses repair welding equipment for laminated circuit board production and a welding method.The repair welding equipment comprises a machine table, a displacement assembly, a welding assembly and a straightening assembly, and a conveying belt and a controller are installed on the machine table; the displacement assembly is erected on the conveying belt; the straightening assembly comprises a mounting plate, a first driving part and centering parts, the mounting plate is arranged on the welding assembly, two sets of symmetrical clamping plates are arranged on the mounting plate in a sliding mode, each set of clamping plates is symmetrically provided with two sets of centering parts, the first driving part is in transmission connection with the two sets of clamping plates, a liquid storage box for storing scaling powder is arranged on the welding assembly, and a spray head is arranged on the liquid storage box. A pressure sensor is arranged on the centering piece, and when the centering piece abuts against the component, the spray head sprays scaling powder to the pin. The method has the effects that the welding quality consistency and the process reliability are guaranteed, and the overall production efficiency is remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of laminated circuit board welding, and in particular to a rework welding device and welding method for laminated circuit board production. Background Art

[0002] With the rapid development of smart car technology, the proportion of onboard electronic devices in the overall vehicle system is increasing. As the core of onboard control and information interaction, the performance and stability of the vehicle computer system have a critical impact on vehicle safety and user experience. To achieve the design requirements of high performance and high integration, vehicle computer systems generally use stacked circuit boards to accommodate high-density wiring and multi-functional module integration within limited spaces. The accompanying circuit board soldering process is also developing towards high precision, high reliability, and automation, striving to ensure soldering consistency and component installation quality in high-volume manufacturing.

[0003] On existing automated soldering lines, component installation and soldering on laminated circuit boards are primarily handled using processes such as reflow soldering, wave soldering, or selective laser soldering. These devices precisely control the temperature curve, soldering path, and flux application to efficiently solder various surface mount devices or through-hole components. During the soldering process, slight component displacements can occur due to factors such as transport vibration, thermal deformation of the circuit board, positioning errors, or differences in wettability between the pad and the component pins, causing the solder joints to shift. In existing processes, once soldering defects such as cold solder joints and bridging occur, localized heating repair is typically employed. This involves reheating the solder joints with a hot air gun or infrared heating device to melt the tin and then adjust the component position to achieve reset. For example, in the related art, a patent with announcement number CN222441953U proposes a desoldering and rework station. The device uses a linear module to accurately move the cylinder and the connecting plate to achieve precise positioning of the solder joints on the circuit board. The heating element heats the solder joints on the circuit board. The generated hot air is directly blown to a specific area of ​​the circuit board through the air supply pipe and the air outlet nozzle. The tin suction pump cooperates with the suction pipe and the collection nozzle to absorb the molten solder and send the sucked solder to the collection box. The visual positioning sensor is installed on the lower surface of the connecting plate to accurately identify the position of the solder joints on the circuit board to improve the accuracy of desoldering.

[0004] However, during the aforementioned rework process, the heated resoldering method, which repositions and re-solders misaligned components, can cause thermal stress accumulation at the solder joints due to repeated heating. This can lead to micro-cracks or tearing between the pads and the solder balls on the pins. In severe cases, the pads can even fall off, leading to new risks of cold solder joints. This problem is particularly prominent in multi-layer PCBs, due to their complex structure and uneven heat conduction paths, which exacerbate the localized accumulation of thermal stress. Summary of the Invention

[0005] The present application provides a rework soldering device and soldering method for the production of laminated circuit boards. The device can accurately identify and locate, align in real time, and detect solder joints of rework components of laminated circuit boards. It not only realizes fully automated and intelligent rework, but also effectively reduces problems such as pad damage and bridging caused by thermal shock in traditional rework methods, ensures welding quality consistency and process reliability, and significantly improves overall production efficiency.

[0006] In the first aspect, the present application provides a rework soldering device for producing laminated circuit boards, which adopts the following technical solution: A rework soldering device for producing laminated circuit boards, comprising: A machine platform, wherein a conveyor belt for transporting the reworked circuit board is provided on the machine platform, and a controller is provided on the machine platform; A displacement assembly, comprising a longitudinal frame and a transverse frame, wherein the longitudinal frame is arranged on the machine platform and mounted on the conveyor belt, and the transverse frame is slidably arranged on the longitudinal frame, and a lifting arm is arranged on the transverse frame for lifting and lowering, and a switching member is arranged at one end of the lifting arm; A welding assembly, comprising a welding mount and a hot air gun, wherein a switching plate is provided on the switching member, the switching member can drive the switching plate to rotate, the welding mount is fixedly mounted on one end of the switching plate, and the hot air gun is fixedly mounted on the welding mount; The straightening assembly comprises a mounting plate, a first driving member and a centering member, the mounting plate being arranged on the welding mounting seat, two groups of clamping plates being slidably arranged on the mounting plate, and the two groups of clamping plates are symmetrically arranged along the length direction of the mounting plate, four groups of centering members are provided, and two groups of centering members are symmetrically arranged on each group of clamping plates, the first driving member is arranged on the mounting plate, the first driving member and the two groups of clamping plates are both transmission-connected, the first driving member can drive the two groups of clamping plates to approach or move away from each other on the mounting plate, multiple groups of centering members can act on components, and when the first driving member drives the two groups of clamping plates to approach each other, the four groups of centering members can adjust the offset position of the components to the correct design position; A liquid storage tank is provided on the welding mounting seat, and flux is filled in the liquid storage tank. A pressure pump is provided on the liquid storage tank, and the pressure pump is electrically connected to the controller. A nozzle is provided on the clamping plate, and the output end of the nozzle is directed toward the pin area of ​​the component. The nozzle is connected to the liquid storage tank, and a pressure sensor is provided on the centering piece, and the pressure sensor is electrically connected to the controller. When the centering piece abuts against the corner of the component, the pressure pump sprays flux onto the pin of the component through the nozzle.

[0007] By adopting the above technical solutions, the equipment integrates the conveyor belt, displacement components, welding components, alignment components and controller, realizing full process control such as automatic transportation, precise positioning and automatic welding during the rework process, significantly improving the convenience of operation and the level of operation automation; in particular, the multiple sets of centering parts and controllable clamping plates are set to fine-tune the positioning of components before welding, and can automatically correct the offset position to ensure that the components are accurately placed on the pads. The position of the components is detected by pressure sensors, and the flux is sprayed when the clamped components are in place. The spraying action is closely related to the position of the components, which not only effectively reduces defects such as cold solder joints and offset solder joints, improves welding consistency and reliability, but also improves the utilization rate of flux, while reducing human errors and material waste.

[0008] Optionally, the centering member includes a first support arm, a second support arm, a first abutment wheel and a second abutment wheel, the first abutment wheel is rotatably set at one end of the first support arm, the second abutment wheel is rotatably set at one end of the second support arm, the end of the first support arm away from the first abutment wheel is fixedly connected to the end of the second support arm away from the second abutment wheel, and the first support arm and the second support arm are cross-arranged, and a rotating shaft is provided at the connection between the first arm and the second arm, and the first arm and the second arm are rotatably set on the clamping plate through the rotating shaft, when the first driving member drives the two groups of clamping plates closer to each other, the first abutment wheel will first movably abut against the outer wall on one side of the component pin, and the second abutment wheel will movably abut against the outer wall on the length direction side of the component.

[0009] By adopting the above technical solution, two sets of symmetrically arranged clamping plates are slidably set on the mounting plate, and two sets of centering pieces are symmetrically installed on each set of clamping plates, forming a structural layout in which a total of four sets of centering pieces work together, so that the excellent effects of multi-point linkage, automatic correction and flexible guiding can be achieved in the process of clamping components. During operation, the clamping plates move synchronously toward the center under the drive of the electric push rod. If a set of centering pieces first contacts the outer wall of the component that is off-center, its abutment wheels will deflect under the reaction force, and the contact status will be fed back in real time through the pressure sensor. This flexible response mechanism not only prevents damage to components due to strong contact, but also actively triggers the control system to suspend clamping, spray flux first and complete the preheating preparation steps, thereby enhancing the reliability and intelligence of the process flow. The first abutment wheel and the second abutment wheel in the centering piece are deflected in coordination through the rotating shaft to achieve bidirectional precise guidance of the width and length directions of the component. The four sets of centering pieces have a mirror-symmetrical structure and synchronous displacement characteristics during the clamping process, ensuring that no matter what the initial offset direction of the component is, it can be forcibly corrected to the standard positioning center position of the mounting plate through the coordination of four points, greatly improving the positioning accuracy and clamping stability of component rework.

[0010] Optionally, it also includes a detection component, which includes a detection mounting base, a measuring meter and a second driving member. The detection mounting base is fixed on one end of the switching plate away from the welding mounting base, the measuring meter is fixed on the detection mounting base, the measuring meter is electrically connected to the controller, and a positive probe and a negative probe are respectively provided on the measuring meter. A carrying plate is fixed on the detection mounting base, and a first slide and a second slide are respectively slidably provided on the carrying plate. The positive probe is fixedly installed on the first slide, and the negative probe is fixedly installed on the second slide. The second driving member is arranged on the carrying plate, and the second driving member is transmission-connected to the first slide and the second slide. The second driving member can drive the first slide and the second slide to approach or move away from each other on the carrying plate, thereby realizing welding detection of components.

[0011] By adopting the above technical solution, an adjustable position positive and negative probe slide structure and a second drive component are set up, which can realize automatic detection of parameters such as the conductive performance and solder joint resistance of components after welding. The precise adjustment of the probe position adapts to electronic components of various sizes and arrangements, significantly improving the versatility and accuracy of detection; the detection component and the switching board are integrated into the design, and after the welding operation is completed, it automatically rotates and switches to the detection position, avoiding tedious steps such as manual handling and secondary positioning, realizing the "welding-detection" integrated process, and effectively improving production efficiency and welding reliability; at the same time, the measuring meter is electrically connected to the controller, and the detection results can be fed back to the system in real time for closed-loop control and defective product screening, ensuring the stability of rework quality, and providing reliable support for the automated rework process.

[0012] The cam is secured to the airtight container and has a first end secured thereto and a second end secured thereto for securing the container to the cam. The cam is secured to the upper and lower surfaces of the second frame by means of a latching mechanism, and the cam is secured to the upper and lower surfaces of the second frame by means of a latching mechanism.

[0013] By adopting the above technical solution, a reducing piece is provided at the air outlet of the hot air gun to form a structure with adjustable air outlet diameter. The reducing structure forms a linkage mechanism with the approaching action of the clamping plate, and the air outlet is adjusted synchronously during the melting of the solder and the adjustment of the component position, so that the hot air coverage range changes dynamically according to the state of the component, and the heat-affected zone is accurately controlled, while ensuring the reliability of welding and improving the overall rework efficiency; specifically, during the welding process, the hot air output by the hot air gun is adjusted and controlled by the reducing piece, and the hot air is smoothly transitioned from the initial high-density concentrated heating state to a dispersed and relaxed state by gradually expanding the diameter, effectively preventing the hot air from continuously concentrating heating in the local area of ​​the component, and avoiding adverse phenomena such as circuit board burning, desoldering or thermal stress cracking caused by excessive heat accumulation; in addition, the first hydraulic rod provided on the hot air gun and the second hydraulic rod driven by the clamping plate are jointly controlled, without the need for an additional electronic control system, and the natural action generated during the component clamping process is used to trigger the change of the reducing structure, thereby reducing the complexity of the system and improving the stability and intelligence.

[0014] Optionally, the detection component also includes a liquid storage box, which is fixed on the detection mounting base, the liquid storage box is filled with thermochromic insulating paint, a liquid outlet pipe is provided on the liquid storage box, a nozzle is provided at one end of the liquid outlet pipe, the nozzle is fixed on the supporting plate, and an electromagnetic valve is provided on the liquid outlet pipe, and the electromagnetic valve is electrically connected to the controller.

[0015] By adopting the above technical solution, the detection component is equipped with a liquid storage box filled with thermochromic insulating paint. Combined with the solenoid valve and nozzle structure, it can accurately mark components with welding defects during the welding detection process. The thermochromic insulating paint used changes color to colorless when heated, preventing the paint from splashing to other locations and affecting the neatness of the circuit board. At the same time, this marking method has insulating properties and will not affect the overall electrical performance and normal operation of the circuit board. It effectively improves the efficiency of identifying welding defects, facilitates subsequent manual or automated rework processing, significantly improves the traceability of rework quality and production efficiency, and reduces the risk of misjudgment and missed detection.

[0016] Optionally, the straightening assembly also includes a lifting member, the lifting member includes a telescopic driving member and a connecting arm, the telescopic driving member is fixed on the welding mounting seat, a sliding block is provided on the welding mounting seat, a guide rail is fixed on the connecting arm, the sliding block is slidably connected to the guide rail, the connecting arm is slidably set on the welding mounting seat through the sliding block, a connecting plate is fixed at one end of the connecting arm, the output end of the telescopic driving member is fixedly connected to the connecting plate, the end of the connecting arm away from the connecting plate is fixedly connected to the mounting plate, and the mounting plate is fixed at the end of the connecting arm away from the connecting plate.

[0017] By adopting the above technical solution, the lifting part includes a telescopic drive part and a connecting arm, which cooperates with the sliding connection between the sliding block and the guide rail to achieve precise lifting and stable support of the alignment component in the vertical direction. The telescopic drive part drives the connecting arm to drive the mounting plate to move up and down, ensuring that the clamping plate and centering part can be flexibly adjusted according to the height and position of the components to achieve precise clamping and fine-tuning alignment. This lifting structure not only improves the accuracy and reliability of component positioning, but also effectively improves the stability and repeatability of the stacked circuit board repair process; at the same time, the sliding guide design ensures the smoothness and smoothness of the lifting action, reduces mechanical wear and structural looseness, and enhances the overall service life and maintenance convenience of the equipment.

[0018] Optionally, the switching component includes a first motor, a driving gear and a driven gear, the first motor is fixed to one end of the lifting arm close to the machine, the driving gear is fixed to the output end of the first motor, a rotating part is fixed to the switching plate, and the switching plate is rotatably arranged at one end of the lifting arm close to the machine through the rotating part, the driven gear is coaxially fixed on the rotating shaft, the driving gear is engaged with the driven gear, and the first motor is electrically connected to the controller.

[0019] By adopting the above technical solution, the gear set driven by the first motor controls the rotation of the switching plate, thereby achieving rapid and automatic switching between the welding assembly and the inspection assembly without the need for human intervention, greatly improving the operating efficiency and the continuous operation capability of the equipment, and reducing positioning errors and time delays.

[0020] Optionally, a positioning camera is provided on the lifting arm, the positioning camera is provided on one side of the switching member, and the positioning camera is electrically connected to the controller.

[0021] By adopting the above technical solution, the integrated positioning camera can perform visual recognition and spatial positioning of the components to be repaired, and accurately transmit the position information to the controller for trajectory planning, thereby improving the accuracy of the repair action. This function can achieve precise alignment and avoid welding offset caused by position misjudgment.

[0022] Optionally, the centering member also includes a tension spring, a fixed column is fixed on the clamping plate, a first annular groove is provided on the fixed column, a convex column is fixed on one end of the second support arm close to the second abutting wheel, a second annular groove is provided on the convex column, one end of the tension spring is sleeved in the first annular groove, and the other end of the tension spring is sleeved in the second annular groove, the pressure sensor is arranged in the first annular groove, one end of the tension spring is pressed on the pressure sensor, and the pressure sensor is electrically connected to the controller.

[0023] By adopting the above technical solution, a tension spring and a pressure sensor are set in the centering piece. The setting of the tension spring realizes the automatic resetting function of the centering piece, ensuring that the centering piece can quickly and accurately restore its initial position after each clamping operation, thereby improving the reusability and work efficiency of the equipment; at the same time, the pressure sensor is set at the position of the tension spring, which can monitor the contact pressure between the centering piece and the corners of the component in real time, and accurately feedback the actual position of the component. After the feedback signal is transmitted to the controller, it can be used to accurately control the amount and timing of flux spraying by the pressure pump and the nozzle on the component pin area, ensuring that the flux evenly and accurately covers the welding area, thereby improving the wettability and welding quality of the solder joints, effectively improving the automation and intelligence level of the equipment, adapting to the rework needs of diversified components, and optimizing the welding rework process.

[0024] On the other hand, the present application provides a soldering method for a rework soldering device used in the production of laminated circuit boards, comprising the following steps: S1. Place the laminated circuit board to be repaired on a conveyor belt, and start the conveyor belt to transport the laminated circuit board to a preset fixed station; S2. Use the positioning camera to scan and identify the precise location information of the components to be repaired on the stacked circuit board and feed the information back to the controller. The controller controls the displacement assembly to accurately move the actuator assembly (soldering assembly and detection assembly) installed at the end of the lifting arm to the top of the components to be repaired; S3. The controller controls the first motor to drive the active gear to rotate the switching plate and move the welding assembly to the working position. Then, the controller controls the telescopic drive member to move the mounting plate downward. The first drive member drives the two sets of clamping plates closer together. When the centering member contacts the corner of the component, the pressure pump sprays flux onto the pins of the component through the nozzle. S4. The controller then activates the hot air gun to generate high-temperature hot air that blows directly toward the pin solder joint area of ​​the component to be repaired, using the high-temperature hot air to melt the solder at the component pin. During this period, the first driving member drives the two sets of clamping plates to continue to move closer to each other, and the alignment component is used to act on the component to accurately adjust it to the correct designed position of the laminated circuit board pad; S5. When the two sets of clamping plates approach each other, the side of the clamping plate abuts against and squeezes the output end of the second hydraulic rod, causing the output end of the first telescopic rod to retract inward and drive the outer plate to deflect outward, thereby causing the first hydraulic rod to drive the outer plate to deflect and, through the cooperation of the two sets of give way grooves and multiple sets of limit rods, push the inner and outer plates to move, so that the hot air output of the hot air gun is concentrated in one position and then gradually dispersed, protecting the surrounding components; S6. Turn off the hot air gun, and the molten solder cools and solidifies. The controller controls the first motor again to drive the switching plate to rotate, and rotates the detection assembly fixed at the other end of the switching plate to the working position so that it faces the components below that have been reworked. The detection assembly is used to detect the soldering status of the reworked components, evaluate the soldering quality, and feed back the detection results to the controller. S7. After the welding quality inspection is completed, the stacked circuit board falls back onto the conveyor belt, and the conveyor belt is started to transport the repaired stacked circuit board away from the fixed station.

[0025] By adopting the above technical solution, this welding method realizes the precise identification and positioning of components for repair of stacked circuit boards, flux spraying, hot air welding, real-time alignment, variable diameter protection, solder joint detection and other operations through a multi-step automatic control process. It not only realizes fully automated and intelligent repair, but also effectively reduces the problems of pad damage and bridging caused by thermal shock in traditional repair methods, ensures the consistency of welding quality and process reliability, and significantly improves overall production efficiency.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Through a multi-step automatic control process, the system can realize the precise identification and positioning of components for laminated PCB repair, flux spraying, hot air soldering, real-time alignment, variable diameter protection, solder joint detection and other operations. It not only realizes fully automated and intelligent rework, but also effectively reduces the problems of pad damage and bridging caused by thermal shock in traditional rework methods, ensures the consistency of welding quality and process reliability, and significantly improves the overall production efficiency.

[0027] 2. Two sets of symmetrically arranged clamping plates are slidably mounted on the mounting plate, and two sets of centering pieces are symmetrically installed on each set of clamping plates, forming a structural layout with a total of four sets of centering pieces working together. This achieves the excellent effects of multi-point linkage, automatic correction, and flexible guidance during the component clamping process. The contact status is fed back in real time via a pressure sensor. This flexible response mechanism not only prevents damage to components due to strong contact, but also actively triggers the control system to suspend clamping, pre-spray flux, and complete preheating preparation steps, thereby enhancing the reliability and intelligence of the process. 3. A reducer is set at the air outlet of the hot air gun to form a structure with adjustable air outlet diameter. The reducer structure forms a linkage mechanism with the approaching action of the clamping plate. The air outlet is adjusted synchronously during the process of solder melting and component adjustment. The hot air coverage range changes dynamically according to the status of the components, and the heat-affected zone is accurately controlled. While ensuring welding reliability, the overall rework efficiency is improved. At the same time, the first hydraulic rod set on the hot air gun and the second hydraulic rod driven by the clamping plate are jointly controlled. No additional electronic control system is required. The natural movement generated during the component clamping process triggers the change of the reducer structure, reducing system complexity and improving stability and intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the rework welding equipment in the embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the overall structure of the rework welding equipment in the embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the overall structure of the detection component and the welding component in the embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of the overall structure of the diameter reducing member in the embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of the overall structure of the straightening component in the embodiment of the present application.

[0033] Figure 6 yes Figure 5Enlarged schematic diagram of part A.

[0034] Reference numerals: 1, machine; 11, controller; 2. Conveyor belt; 3. Displacement assembly; 31. Longitudinal shift frame; 32. Transverse shift frame; 33. Lifting arm; 34. Switching member; 341. Switching plate; 3411. Rotating portion; 342. First motor; 343. Driving gear; 344. Driven gear; 35. Positioning camera; 4. Welding assembly; 41. Welding mounting base; 411. Sliding block; 42. Hot air gun; 421. Air outlet; 43. Liquid storage tank; 431. Pressure pump; 432. Nozzle; 44. Reducer; 441. Mounting sleeve; 442. Inner plate; 4421. Sliding rod; 443. Outer plate; 4431. First limiting rod; 4432. Second limiting rod; 444. First hydraulic rod; 445. Second hydraulic rod; 446. Limiting plate; 4461. First clearance groove; 4462. Second clearance groove; 447. Retaining ring; 5. Alignment assembly; 51. Mounting plate; 52. First driving member; 521. Electric push rod; 522. First pull rod; 523. Second pull rod; 524. Rotating arm; 53. Centering member; 531. First support arm; 532. Second support arm; 5321. Boss; 533. First abutment wheel; 534. Second abutment wheel; 535. Rotating shaft; 536. Tension spring; 54. Clamping plate; 541. Fixed column; 55. Pressure sensor; 56. Lifting member; 561. Telescopic driving member; 562. Connecting arm; 563. Guide rail; 564. Connecting plate; 6. Detection assembly; 61. Detection mounting base; 611. Carrying plate; 612. First slide; 613. Second slide; 62. Measuring meter; 621. Positive probe; 622. Negative probe; 63. Second driving member; 64. Liquid storage box; 641. Liquid outlet pipe; 642. Nozzle; 643. Solenoid valve. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] The present application discloses a rework soldering device and soldering method for producing laminated circuit boards. Figure 1 and Figure 2In the embodiment of the present application, the rework soldering equipment for the production of laminated circuit boards includes a machine 1, a conveyor belt 2, a displacement component 3, a welding component 4, a straightening component 5 and a detection component 6. The machine 1 serves as the installation base of the entire welding equipment. The conveyor belt 2 and the displacement component 3 are both installed on the machine 1, and the displacement component 3 is mounted above the conveyor belt 2. The welding component 4 and the detection component 6 are both installed on the displacement component 3, and the welding component 4 is located on one side of the displacement component 3, and the detection component 6 is located on the other side of the displacement component 3. The straightening component 5 is installed on the welding component 4, and the straightening component 5 is located on one side of the welding component 4.

[0037] The conveyor belt 2 is used to transport the stacked circuit boards to be repaired to a fixed work station for repair; the displacement component 3 is used to drive the welding component 4 and the detection component 6 to move, so that the welding component 4 and the detection component 6 can accurately locate the components to be repaired on the stacked circuit boards; the welding component 4 can melt the solder for welding or desoldering; the straightening component 5 can straighten the installation position of the components after the welding component 4 melts the solder; the detection component 6 can detect the welding status of the components after the repair welding is completed to confirm that there is no risk of loose connection between the repaired components and the stacked circuit boards.

[0038] Reference Figure 1 and Figure 2 In the embodiment of the present application, the conveyor belt 2 includes a belt body, a driving roller, a tensioning roller, a conveying drive member, a support frame and a fixing member. The support frame is mounted on the machine 1, and the belt body is a closed ring. The driving roller and the tensioning roller are both rotatably arranged on the support frame, and the driving roller and the tensioning roller are symmetrically arranged along the length direction of the support frame. The belt body is wound around the driving roller and the tensioning roller, and the outer peripheral surface of the belt body is flush with the upper top surface of the support frame, and the width of the belt body is smaller than the width of the stacked circuit board. The conveying drive member is fixed on the support frame, and the output end of the conveying drive member is fixedly connected to the driving roller. The conveying drive member is set as a stepping motor, and the conveying drive member is electrically connected to the controller 11. When the driving roller rotates, it drives the belt body to circulate.

[0039] The fixing parts include a lifting drive part and a limiting guide rail. The limiting guide rail is fixed on the support frame. A positioning groove is provided on the limiting guide rail. An infrared sensor is provided on the limiting guide rail. The infrared sensor is electrically connected to the controller 11. There are two groups of limiting guide rails, and the two groups of limiting rails are symmetrically arranged along the width direction of the conveyor belt 2.

[0040] A lifting drive is fixed to the side wall of the support frame. The lifting drive can be configured as a lifting cylinder. A clamping plate is fixed to the output end of the lifting drive. When the reworked circuit board passes the infrared sensor, the lifting drive drives the clamping plate to extend vertically upward, thereby lifting the reworked circuit board. The clamping plate presses one side of the reworked circuit board along its length into the positioning groove. The fixing member is not shown in the drawings of the embodiment of this application.

[0041] Reference Figure 2 and Figure 3 In the embodiments of the present application, the displacement component 3 includes a longitudinal movement frame 31, a transverse movement frame 32, a lifting arm 33, a switching member 34, and a positioning camera 35. The longitudinal movement frame 31 is fixedly arranged on the machine table 1. The longitudinal movement frame 31 is arranged as a "冂"-shaped frame. The longitudinal movement frame 31 is erected on the conveyor belt 2. A slide rail is fixedly arranged on the longitudinal movement frame 31. There are two groups of longitudinal movement frames 31, and the two groups of longitudinal movement frames 31 are symmetrically arranged along the length direction of the machine table 1. The transverse movement frame 32 is arranged in a square column shape. One end of the transverse movement frame 32 is slidably connected to the slide rail on one group of longitudinal movement frames 31, and the other end of the transverse movement frame 32 is slidably connected to the slide rail on the other group of longitudinal movement frames 31. The transverse movement frame 32 is slidably arranged on the two groups of longitudinal movement frames 31. The transverse movement frame 32 and the two groups of longitudinal movement frames 31 together form a truss structure. A first driving mechanism for driving the transverse movement member to move is further installed between the transverse movement frame 32 and the longitudinal movement frame 31. The first driving mechanism is arranged as a motor screw mechanism.

[0042] A slide table is slidably arranged on the transverse movement frame 32. A second driving mechanism for driving the slide table to move is installed between the slide table and the transverse movement frame 32. The second driving mechanism can also be arranged as a motor screw mechanism.

[0043] The lifting arm 33 is slidably installed on the slide table in the vertical direction. A lifting rack is fixedly arranged on the lifting arm 33. A driving motor is fixedly arranged above the slide table. The driving motor is electrically connected to the controller 11. A first gear is fixedly arranged on the output end of the driving motor. The first gear meshes with the lifting rack.

[0044] A switching member 34 is arranged at one end of the lifting arm 33 close to the machine table 1. The switching member 34 includes a first motor 342, a driving gear 343, a driven gear 344, and a switching plate 341. The first motor 342 is arranged as a servo motor. The first motor 342 is electrically connected to the controller 11. The first motor 342 is fixedly arranged on the outer side wall of one end of the lifting arm 33 close to the machine table 1. The driving gear 343 is fixedly arranged on the output end of the motor. The switching plate 341 is arranged as a rectangular plate. A rotating portion 3411 is fixedly arranged at the central position of the switching plate 341. The rotating portion 3411 is arranged in a shaft shape. The switching plate 341 is rotationally arranged on the end surface of one end of the lifting arm 33 close to the machine table 1 through the rotating portion 3411. The driven gear 344 is coaxially fixedly arranged on the rotating shaft 535. The driving gear 343 meshes with the driven gear 344.

[0045] A positioning frame is fixedly arranged on the outer wall of one end of the lifting arm 33 close to the machine table 1. The positioning camera 35 is fixedly arranged on the positioning frame, and the positioning camera 35 is directly facing the machine table 1. The positioning camera 35 is electrically connected to the controller 11. The positioning camera 35 can quickly identify the position of the components to be repaired on the repaired circuit board and feed back the position information to the controller 11, so that the controller 11 can accurately control the lifting arm 33 to move above the components to be repaired.

[0046] Reference Figure 2 、 Figure 3 and Figure 4 In the embodiment of the present application, the welding assembly 4 includes a welding mounting base 41, a hot air gun 42, a reducer 44 and a liquid storage tank 43. The welding mounting base 41 is fixed to one end of the switching plate 341 in the length direction, and the hot air gun 42 is fixed on the welding mounting base 41. The hot air gun 42 is electrically connected to the controller 11; The reducer 44 includes a mounting sleeve 441, an inner plate 442, an outer plate 443, a limiting plate 446, a first hydraulic rod 444 and a second hydraulic rod 445. The hot air gun 42 is provided with an air outlet 421. The mounting sleeve 441 is fixedly sleeved on the air outlet 421. The inner plate 442 is provided as an arc-shaped plate. One end of the inner plate 442 is rotatably provided on the end of the mounting sleeve 441 away from the hot air gun 42 through a hinge structure, and a gap is reserved between one end of the inner plate 442 and the end of the mounting sleeve 441 away from the hot air gun 42. A sliding rod 4421 is fixedly provided at the other end of the inner plate 442. The limiting plate 446 is slidably provided on the sliding rod 4421. The sliding rod 4 An anti-slip ring is fixed to the end of 421 away from the inner plate 442, and a first make way groove 4461 and a second make way groove 4462 are respectively opened on the limit plate 446. The first make way groove 4461 and the second make way groove 4462 are symmetrically arranged along the length direction of the limit plate 446. A fixing ring 447 is fixedly sleeved on the mounting sleeve 441, and a connecting portion is fixed on the fixing ring 447. The connecting portion is set to a sheet made of flexible and high-temperature resistant material. The outer plate 443 is also set to an arc-shaped plate. One end of the outer plate 443 is fixedly connected to the end of the connecting portion away from the air outlet 421, and the other end of the outer plate 443 is respectively fixed with a first limit rod 4431 and a second limit rod 4432.

[0047] There are multiple groups of inner plates 442 and outer plates 443, and the multiple groups of inner plates 442 and outer plates 443 are distributed in a circle along the outer circumferential arm of the mounting sleeve 441, and the multiple groups of outer plates 443 are arranged on the outer circumferential side of the inner plate 442. The multiple groups of outer plates 443 and the fixed tube are combined to form a variable diameter limiting cylinder. The outer plates 443 and the inner plates 442 are staggered on the mounting sleeve 441, and the sliding rod 4421 is just located between the two adjacent groups of outer plates 443. At this time, the first clearance groove 4461 opened on the limiting plate 446 is plugged into and matched with the second limiting rod 4432 on the outer plate 443 on the adjacent side, and the second clearance groove 4462 is plugged into and matched with the first limiting rod 4431 on the outer plate 443 on the other adjacent side.

[0048] One end of the hot air gun 42 close to the air outlet 421 is fixedly provided with a fixing part. One end of the first hydraulic rod 444 is set as the output end, and the other end of the first hydraulic rod 444 is set as the fixed end. The fixed end of the first hydraulic rod 444 is rotatably connected to the fixing part, and the output end of the first hydraulic rod 444 is rotatably connected to a group of outer plates 443. The second hydraulic rod 445 is installed on the alignment component 5, and the first hydraulic rod 444 is in transmission connection with the second hydraulic rod 445.

[0049] The liquid storage tank 43 is fixedly arranged on the welding mounting seat 41, and the liquid storage tank 43 is located between the hot air gun 42 and the lifting arm 33. The liquid storage tank 43 is filled with a soldering flux. A pressure pump 431 is fixedly arranged on the liquid storage tank 43. The pressure pump 431 is electrically connected to the controller 11. An output pipe is fixedly arranged on the liquid storage tank 43. One end of the output end far away from the liquid storage tank 43 is fixedly provided with a nozzle 432. The nozzle 432 is communicated with the liquid storage tank 43 through the output pipe.

[0050] Refer to Figure 5 and Figure 6 In the embodiment of the present application, the alignment component 5 includes a lifting member 56, a mounting plate 51, a first driving member 52, a clamping plate 54 and a centering member 53. The lifting member 56 includes a telescopic driving member 561 and a connecting arm 562. A mounting part is fixedly arranged on the welding mounting seat 41. The telescopic driving member 561 is fixedly arranged on the mounting part. The telescopic driving member 561 can be set as a cylinder. A sliding block 411 is fixedly arranged on the welding mounting seat 41. A guide rail 563 is fixedly arranged on the connecting arm 562. The sliding block 411 is slidably connected to the guide rail 563. The connecting arm 562 is slidably arranged on the welding mounting seat 41 through the sliding block 411. One end of the connecting arm 562 is fixedly provided with a connecting plate 564. The output end of the telescopic driving member 561 is fixedly connected to the connecting plate 564. When the output end of the telescopic driving member 561 extends outwards, it will drive the connecting arm 562 to lift upwards. In this embodiment, two groups of lifting members 56 are provided, and the two groups of lifting members 56 are symmetrically arranged along the width direction of the welding mounting seat 41.

[0051] The mounting plate 51 is fixedly connected to the end of the connecting arm 562 far away from the connecting plate 564. The mounting plate 51 is set as a "冂"-shaped plate. Two groups of guide rods are fixedly arranged on the mounting plate 51. A distance sensor is arranged on the mounting plate 51. The distance sensor is electrically connected to the controller 11. The two groups of guide rods are symmetrically arranged along the width direction of the mounting plate 51. Multiple groups of circular sliders are fixedly arranged on both sides in the length direction of the clamping plate 54. The circular sliders are slidably connected to the guide rods. The clamping plate 54 is slidably arranged on the mounting plate 51 through the circular sliders.

[0052] The centering member 53 includes a first support arm 531, a second support arm 532, a first abutting wheel 533, a second abutting wheel 534, a tension spring 536 and a pressure sensor 55. The first abutting wheel 533 is rotatably set at one end of the first support arm 531, and the second abutting wheel 534 is rotatably set at one end of the second support arm 532. The end of the first support arm 531 away from the first abutting wheel 533 and the end of the second support arm 532 away from the second abutting wheel 534 are fixedly connected to form a centering arm, and the first support arm 531 and the second support arm 532 are cross-arranged, and the length of the first support arm 531 is smaller than the length of the second support arm 532.

[0053] A rotating shaft 535 is provided at the connection between the first support arm 531 and the second support arm 532. The centering arm is rotatably mounted on the clamping plate 54 via the rotating shaft 535. The centering arm is located on one side of the lengthwise direction of the clamping plate 54. A fixing post 541 is fixed to the corner of the clamping plate 54 near the centering arm. The fixing post 541 has a first annular groove. A protrusion 5321 is fixed to one end of the second support arm 532 near the second abutting wheel 534. The protrusion 5321 has a second annular groove. One end of a tension spring 536 is sleeved within the first annular groove, and the other end of the tension spring 536 is sleeved within the second annular groove.

[0054] The pressure sensor 55 is disposed in the first annular groove. One end of the tension spring 536 presses on the pressure sensor 55 . The pressure sensor 55 is electrically connected to the controller 11 .

[0055] The nozzle 432 is fixed on the center line of the clamping plate 54 in the length direction, and the nozzle 432 is located on the side of the clamping plate 54 away from the rotation axis. The spraying direction of the nozzle 432 is facing the soldering pad at the corresponding position on the circuit board, that is, the soldering position between the component pin and the soldering pad.

[0056] In this embodiment, two sets of clamping plates 54 are provided, symmetrically arranged along the length of the mounting plate 51. Two sets of centering members 53 are provided on each set of clamping plates 54, symmetrically arranged along the length of the clamping plates 54. Therefore, in this embodiment, a total of four sets of centering members 53 are provided, corresponding to the corners of the SMD components on the laminated circuit board. Two sets of nozzles 432 are also provided, corresponding one-to-one with the two sets of clamping plates 54.

[0057] The second hydraulic rod 445 is fixed to the mounting plate 51, and the output ends of the two hydraulic rods are movably abutted against one end of a set of clamping plates 54 near the rotating shaft. A first and a second fluid infusion tube are fixed to the second hydraulic rod 445, and the second hydraulic rod 445 is connected to the first hydraulic rod 444 through the first and second fluid infusion tubes. It is worth noting that both the first and second hydraulic rods 444, 445 are configured as telescopic rods filled with hydraulic oil, and the diameter of the first hydraulic rod 444 is larger than that of the second hydraulic rod 445.

[0058] The first driving member 52 includes an electric push rod 521, a first pull rod 522, a second pull rod 523 and a rotating arm 524. The electric push rod 521 is fixed on the mounting plate 51, and the output end of the electric push rod 521 is rotatably connected to a group of clamping plates 54. A rotating shaft is fixed to a side of the mounting plate 51 close to the machine 1, and the rotating shaft is located at the center of the mounting plate 51. The rotating arm 524 is rotatably set on the rotating shaft. One end of the first pull rod 522 is rotatably connected to a group of clamping plates 54, and the other end of the first pull rod 522 is rotatably connected to one end of the rotating arm 524. One end of the second pull rod 523 is rotatably connected to another group of clamping plates 54, and the other end of the second pull rod 523 is rotatably connected to an end of the rotating arm 524 away from the first pull rod 522.

[0059] More specifically, in the initial state, the clamping plates 54 are located at both ends of the mounting plate 51, and the tension spring 536 is in a retracted state. When the positioning camera 35 is positioned on the component to be repaired, the lifting plate is driven by the displacement truss to move above the component, and the mounting plate 51 is located directly above the component. It should be noted here that the positioning reference of the positioning camera 35 is based on the solder pad where the component is located, so the corresponding position of the mounting plate 51 is the correct installation position of the component.

[0060] When the distance sensor detects that the mounting plate 51 has moved to a suitable position, the output end of the electric push rod 521 is also retracted inward, and the two groups of clamping plates 54 are simultaneously driven to approach each other through the first pull rod 522 and the second pull rod 523. When a group of first abutting wheels 533 first abut against the outer wall on one side of the width direction of the component, since the hot air heater has not been started at this time and the component is fixedly soldered on the circuit board, the first abutting wheel 533 will deflect after receiving the reaction force and rotate to the side away from the corresponding rotating arm 524. This deflection action causes the pressure sensor 55 installed at this position to sense an abnormal pressure increase signal. The controller 11 instructs the electric push rod 521 to temporarily stop the action according to the signal, and at the same time starts the pressure pump 431 to spray flux to the pins of the component through the channel installed on the nozzle 432, in preparation for subsequent heating and disassembly. After spraying is completed, the controller 11 starts the hot air generator to deliver hot air to the solder area, and then starts the electric push rod 521 again to continue driving the clamping plate 54 inward. As the first abutment wheel 533 continues to deflect, it drives the connected second abutment wheel 534 to deflect synchronously in the direction of approaching the component to achieve two-way contact. Four symmetrical sets of centering pieces 53 are provided on the mounting plate 51. The displacement of these centering pieces 53 during the clamping process always remains strictly consistent. Therefore, no matter which direction the component is initially offset, it can be forced to be corrected to the preset center position under the coordination of four points.

[0061] At the same time, the edge of the clamping plate 54 on one side will gradually contact the output end of the second hydraulic rod 445 and apply an extrusion force to it, pushing the output end of the second hydraulic rod 445 to retract inward, driving the first telescopic rod connected thereto to shrink synchronously, and the telescopic action further drives the outer plate 443 on the hot air nozzle 432 to deflect outward. Since a limiting mechanism is provided between the outer plate 443 and the inner plate 442, the outer plate 443 will drive the inner plate 442 to deflect synchronously during the deflection process. This action causes the diameter of the air outlet 421 of the nozzle 432 to gradually increase, thereby causing the output hot air to transition from the initial high-density concentrated heating state to a dispersed and relaxed state, effectively preventing local ablation or thermal stress damage to the circuit board due to excessive concentration of hot air.

[0062] Finally, the controller 11 turns off the hot air blower, the electric push rod 521 drives the clamping plates 54 to move away from each other, and the telescopic driving member 561 drives the mounting plate 51 to move upward, thereby completing the repair of the components.

[0063] Of course, in other embodiments of the present application, the first drive member 52 may also be provided with other forms of mechanical mechanisms, as long as the first drive member 52 drives the two groups of clamping plates 54 to move closer to or away from each other. For example, the first drive member 52 may be provided with a motor gear mechanism, that is, the first drive member 52 includes a servo motor, a driving gear, a first rack and a second rack. The servo motor is fixed on the mounting plate 51, and the servo motor is electrically connected to the controller 11. The starting gear is fixed on the output end of the servo motor. One end of the first gear is fixedly connected to one group of clamping plates 54, and the other end of the first rack is engaged with the driving gear. One end of the second gear is fixedly connected to another group of clamping plates 54, and the other end of the second rack is also engaged with the driving gear. By controlling the direction of the servo motor, the two groups of clamping plates 54 can be moved closer to or away from each other.

[0064] Reference Figure 2 and Figure 3 In the embodiment of the present application, the detection assembly 6 includes a detection mounting base 61, a measuring meter 62, a second driving member 63 and a liquid storage box 64. The detection mounting base 61 is fixed on the end of the switching plate 341 away from the welding mounting base 41, and the measuring meter 62 is fixed on the detection mounting base 61. The measuring meter 62 is electrically connected to the controller 11. The measuring meter 62 is respectively provided with a positive probe 621 and a negative probe 622. A supporting plate 611 is fixed on the detection mounting base 61, and a first slide 612 and a second slide 613 are respectively slidably provided on the supporting plate 611. The positive probe 621 is fixedly inserted into the first slide 612, and the negative probe 622 is fixedly inserted into the second slide 613.

[0065] The second driving member 63 is arranged on the supporting plate 611. In the embodiment of the present application, the second driving member 63 has the same characteristic setting as the first driving member 52, and the connection setting between the second driving member 63 and the first slide 612 and the second slide 613 is also the same as the connection setting between the first driving member 52 and the two sets of clamping plates 54. The difference between the first driving member 52 and the second driving member 63 is that the overall size of the second driving member 63 is smaller than the overall size of the first driving member 52.

[0066] The liquid storage box 64 is fixed on the detection mounting base 61. The liquid storage box 64 is filled with thermochromic insulating paint. A liquid outlet pipe 641 is provided on the liquid storage box 64. A nozzle 642 is provided at one end of the liquid outlet pipe 641. The nozzle 642 is fixed on the supporting plate 611, and the nozzle 642 is facing the components. An electromagnetic valve 643 is provided on the liquid outlet pipe 641, and the electromagnetic valve 643 is electrically connected to the measuring meter 62.

[0067] The initial state of the solenoid valve 643 is set to the closed state. When the measuring meter 62 detects that the component is normally connected, the controller 11 will not control the solenoid valve 643 to open. When there is a loose connection between the component and the circuit board, the measuring meter 62 detects that the resistance at both ends of the component increases, and the controller 11 will control the solenoid valve 643 to open.

[0068] In more detail, after the components have been processed by the straightening assembly 5, the first motor 342 drives the switching plate 341 to rotate, switching the detection assembly 6 to the original working position of the straightening assembly 5, and then the second driving member 63 drives the first slide 612 and the second slide 613 to move closer to each other until the positive probe 621 abuts against one side of the component and the negative probe 622 abuts against the other side of the component. When there is a welding defect between the component and the pad, the resistance of the component detected by the measuring meter 62 will increase, so that the controller 11 controls the solenoid valve 643 to open, and the nozzle 642 will spray thermochromic insulating paint on the component for marking; after the detection is completed, the second driving member 63 drives the first slide 612 and the second slide 613 away from each other, and the lifting arm 33 is lifted upward.

[0069] The working principle of the rework soldering equipment for producing laminated circuit boards in the embodiment of the present application is as follows: the laminated circuit board to be reworked is placed on the conveyor belt 2, and the conveyor belt 2 is started to transport the laminated circuit board to a preset fixed station; when the infrared sensor detects the arrival of the laminated circuit board, the lifting drive member is triggered to drive the clamping plate to press one side of the laminated circuit board in the longitudinal direction into the positioning groove of the limiting guide rail, thereby completing the fixed positioning of the laminated circuit board; Start the positioning camera 35 on the displacement assembly 3, use the positioning camera 35 to scan and identify the precise position information of the components to be repaired on the laminated circuit board, and transmit the identified position coordinate information of the components to be repaired to the controller 11; the controller 11 controls the displacement assembly 3 to operate according to the received position coordinate information: Controlling the first driving mechanism to drive the transverse moving frame 32 to move along the slide rail on the longitudinal moving frame 31 to adjust the position in the first horizontal direction (e.g., X-axis); Controlling the second driving mechanism to drive the slide to move along the transverse frame 32 to adjust the position in the second horizontal direction (e.g., the Y axis); Control the driving motor to drive the lifting arm 33 to move up and down along the vertical direction (Z axis) through the gear rack mechanism to adjust the height position; Through the above three-axis linkage, the execution assembly (welding assembly 4 and detection assembly 6) installed at the end of the lifting arm 33 is accurately moved to the top of the component to be repaired.

[0070] The controller 11 controls the first motor 342 to drive the driving gear 343 to rotate the switching plate 341, thereby rotating the welding assembly 4 fixed to one end of the switching plate 341 to the working position so that it faces the component to be repaired below. The controller 11 controls the telescopic driving member 561 to move the mounting plate 51 downward, and then controls the first driving member 52 to drive the two sets of clamping plates 54 closer to each other. When the centering member 53 contacts the corner of the component, the pressure pump 431 sprays flux onto the pins of the component through the nozzle 432. Then the controller 11 activates the hot air gun 42 to generate high-temperature hot air that blows directly toward the pin solder joint area of ​​the component to be repaired, using the high-temperature hot air to melt the solder at the component pin. During this period, the first driving member 52 drives the two sets of clamping plates 54 to continue to move closer to each other, and the alignment component 5 acts on the component to accurately adjust it to the correct designed position of the laminated circuit board pad. When the two groups of clamping plates 54 approach each other, the side of the clamping plate 54 abuts against and squeezes the output end of the second hydraulic rod 445, so that the output end of the first telescopic rod is retracted inward, driving the outer plate 443 to deflect outward. The extension and retraction of the hydraulic rod drives the outer plate 443 to deflect, and through the cooperation of multiple groups of give way grooves and multiple groups of limit rods, the inner plate 442 and the outer plate 443 are pushed to move. The variable diameter limit cylinder composed of multiple groups of staggered inner plates 442 and outer plates 443 changes its inner diameter, so that the hot air output from the air outlet 421 of the hot air gun 42 is concentrated in one position and then gradually dispersed, thereby enlarging the air outlet 421 of the hot air gun 42 and protecting the surrounding components. The hot air gun 42 is turned off, and the molten solder cools and solidifies. The controller 11 controls the first motor 342 again to drive the switching plate 341 to rotate, and the detection assembly 6 fixed to the other end of the switching plate 341 is rotated to the working position so that it faces the reworked components below. The detection assembly 6 is used to detect the soldering status of the reworked components, evaluate the soldering quality, and feed back the detection results to the controller 11. After the welding quality inspection is completed, the controller 11 controls the lifting drive to retract. The clamping plate descends, releasing the repaired laminated circuit board; the laminated circuit board falls back onto the conveyor belt 2, and the conveyor belt 2 is started to transport the repaired laminated circuit board away from the fixed station.

[0071] The present application also discloses a welding method for a rework welding device used in the production of a laminated circuit board, the method comprising the following steps: S1, conveying and fixing positioning, placing the laminated circuit board to be repaired on the conveyor belt 2, starting the conveyor belt 2 to transport the laminated circuit board to the preset fixed position; S2, visual positioning and precise displacement, using the positioning camera 35 to scan and identify the precise position information of the components to be repaired on the laminated circuit board and feed the information back to the controller 11. The controller 11 controls the displacement component 3 to accurately move the actuator components (soldering component 4 and detection component 6) installed at the end of the lifting arm 33 to the position directly above the components to be repaired; S3. Switch to the welding assembly 4. The controller 11 controls the first motor 342 to drive the driving gear 343 to drive the switching plate 341 to rotate and turn the welding assembly 4 to the working position. Then, the controller 11 controls the telescopic driving member 561 to drive the mounting plate 51 downward. The first driving member 52 drives the two sets of clamping plates 54 to move closer to each other. When the centering member 53 contacts the corner of the component, the pressure pump 431 sprays flux onto the pins of the component through the nozzle 432. S4, heating and alignment. The controller 11 then activates the hot air gun 42 to generate high-temperature hot air that blows directly toward the pin solder joint area of ​​the component to be repaired. The high-temperature hot air melts the solder at the component pin. During this period, the first driving member 52 drives the two sets of clamping plates 54 to continue to move closer to each other. The alignment component 5 acts on the component to accurately adjust it to the correct designed position of the laminated circuit board pad. S5. Hot air adjustment: When the two sets of clamping plates 54 approach each other, the side of the clamping plate 54 abuts against and squeezes the output end of the second hydraulic rod 445, causing the output end of the first telescopic rod to retract inward and drive the outer plate 443 to deflect outward, thereby causing the first hydraulic rod 444 to drive the outer plate 443 to deflect and, through the cooperation of the two sets of give way grooves and multiple sets of limit rods, push the inner plate 442 and the outer plate 443 to move, so that the hot air output of the hot air gun 42 is gradually dispersed from being concentrated in one position, protecting the surrounding components; S6, welding quality inspection: turn off the hot air gun 42, let the molten solder cool and solidify, and then the controller 11 controls the first motor 342 again to drive the switching plate 341 to rotate, and rotate the inspection component 6 fixed to the other end of the switching plate 341 to the working position, so that it faces the components below that have been reworked. The inspection component 6 is used to inspect the welding status of the reworked components, evaluate the welding quality, and feed back the inspection results to the controller 11; S7, release and unloading. After the welding quality inspection is completed, the controller 11 controls the jacking drive to retract; the clamping plate descends, releasing the laminated circuit board that has completed the repair, and the laminated circuit board falls back onto the conveyor belt 2. The conveyor belt 2 is started to transport the repaired laminated circuit board away from the fixed station.

[0072] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rework soldering equipment for producing laminated circuit boards, characterized in that: include: A machine platform, wherein a conveyor belt for transporting the reworked circuit board is provided on the machine platform, and a controller is provided on the machine platform; A displacement assembly, comprising a longitudinal frame and a transverse frame, wherein the longitudinal frame is arranged on the machine platform and mounted on the conveyor belt, and the transverse frame is slidably arranged on the longitudinal frame, and a lifting arm is arranged on the transverse frame for lifting and lowering, and a switching member is arranged at one end of the lifting arm; A welding assembly, comprising a welding mount and a hot air gun, wherein a switching plate is provided on the switching member, the switching member can drive the switching plate to rotate, the welding mount is fixedly mounted on one end of the switching plate, and the hot air gun is fixedly mounted on the welding mount; The straightening assembly comprises a mounting plate, a first driving member and a centering member, the mounting plate being arranged on the welding mounting seat, two groups of clamping plates being slidably arranged on the mounting plate, and the two groups of clamping plates are symmetrically arranged along the length direction of the mounting plate, four groups of centering members are provided, and two groups of centering members are symmetrically arranged on each group of clamping plates, the first driving member is arranged on the mounting plate, the first driving member and the two groups of clamping plates are both transmission-connected, the first driving member can drive the two groups of clamping plates to approach or move away from each other on the mounting plate, multiple groups of centering members can act on components, and when the first driving member drives the two groups of clamping plates to approach each other, the four groups of centering members can adjust the offset position of the components to the correct design position; A liquid storage tank is provided on the welding mounting seat, and flux is filled in the liquid storage tank. A pressure pump is provided on the liquid storage tank, and the pressure pump is electrically connected to the controller. A nozzle is provided on the clamping plate, and the output end of the nozzle is directed toward the pin area of ​​the component. The nozzle is connected to the liquid storage tank, and a pressure sensor is provided on the centering piece, and the pressure sensor is electrically connected to the controller. When the centering piece abuts against the corner of the component, the pressure pump sprays flux onto the pin of the component through the nozzle.

2. The rework soldering equipment for producing laminated circuit boards according to claim 1, characterized in that: The centering member includes a first support arm, a second support arm, a first abutment wheel and a second abutment wheel, the first abutment wheel is rotatably set at one end of the first support arm, the second abutment wheel is rotatably set at one end of the second support arm, the end of the first arm away from the first abutment wheel is fixedly connected to the end of the second arm away from the second abutment wheel, and the first arm and the second arm are cross-arranged, and a rotating shaft is provided at the connection between the first arm and the second arm, and the first arm and the second arm are rotatably set on the clamping plate through the rotating shaft, when the first driving member drives the two groups of clamping plates closer to each other, the first abutment wheel will first movably abut against the outer wall on one side of the component pin, and the second abutment wheel will movably abut against the outer wall on the side of the component length direction.

3. The rework soldering equipment for producing laminated circuit boards according to claim 1, characterized in that: It also includes a detection component, which includes a detection mounting base, a measuring meter and a second driving member. The detection mounting base is fixedly provided at one end of the switching plate away from the welding mounting base, the measuring meter is fixedly provided on the detection mounting base, the measuring meter is electrically connected to the controller, and the measuring meter is respectively provided with a positive probe and a negative probe. The detection mounting base is fixedly provided with a carrying plate, and a first slide and a second slide are respectively slidably provided on the carrying plate. The positive probe is fixedly provided on the first slide, and the negative probe is fixedly provided on the second slide. The second driving member is provided on the carrying plate, and the second driving member is transmission-connected to the first slide and the second slide. The second driving member can drive the first slide and the second slide to move closer to or away from each other on the carrying plate, thereby realizing welding detection of components.

4. The rework soldering equipment for producing laminated circuit boards according to claim 1, characterized in that: The cam is provided with an air outlet, and the air outlet is provided with a reducing member for adaptively adjusting the size of the air outlet, and the reducing member includes a mounting sleeve, an inner plate, an outer plate, a first hydraulic rod and a second hydraulic rod, and the mounting sleeve is sleeved on the air outlet, and one end of the inner plate is rotatably mounted on one end of the mounting sleeve, and the other end of the inner plate is fixedly provided with a sliding rod, and the sliding rod is slidably provided with a limit plate, and the limit plate is symmetrically provided with a first makeshift groove and a second makeshift groove, and the mounting sleeve is sleeved with a fixing ring, one end of the outer plate is connected to one end of the fixing ring, and the other end of the outer plate is symmetrically fixed with a first limit rod and a second limit rod, and the inner plate and the outer plate are provided with multiple groups, and the multiple groups of the inner plates and the outer plates are staggered along the circumferential direction of the mounting sleeve, and the outer plate is located on the outer peripheral side of the inner plate, and the multiple groups of the outer plates and the inner plates form a surrounding shape. The cam is connected to the second support frame of the second support frame by means of a pin, and the pin is connected to the support frame by means of a pin.

5. The rework soldering equipment for producing laminated circuit boards according to claim 3, characterized in that: The detection component also includes a liquid storage box, which is fixed on the detection mounting base. The liquid storage box is provided with a liquid outlet pipe, one end of the liquid outlet pipe is provided with a nozzle, the nozzle is fixed on the supporting plate, and the liquid outlet pipe is provided with an electromagnetic valve, which is electrically connected to the controller.

6. The rework soldering equipment for producing laminated circuit boards according to claim 1, characterized in that: The straightening assembly also includes a lifting member, which includes a telescopic driving member and a connecting arm. The telescopic driving member is fixedly mounted on the welding mounting seat, a sliding block is provided on the welding mounting seat, a guide rail is fixedly provided on the connecting arm, the sliding block is slidably connected to the guide rail, and the connecting arm is slidably arranged on the welding mounting seat through the sliding block. A connecting plate is fixedly provided at one end of the connecting arm, the output end of the telescopic driving member is fixedly connected to the connecting plate, the end of the connecting arm away from the connecting plate is fixedly connected to the mounting plate, and the mounting plate is fixed at the end of the connecting arm away from the connecting plate.

7. The rework soldering equipment for producing laminated circuit boards according to claim 1, characterized in that: The switching component includes a first motor, a driving gear and a driven gear. The first motor is fixed to one end of the lifting arm close to the machine platform, the driving gear is fixed to the output end of the first motor, a rotating part is fixed to the switching plate, and the switching plate is rotatably arranged on the end of the lifting arm close to the machine platform through the rotating part. The driven gear is coaxially fixed to the rotating shaft, the driving gear is engaged with the driven gear, and the first motor is electrically connected to the controller.

8. The rework soldering equipment for producing laminated circuit boards according to claim 7, characterized in that: A positioning camera is provided on the lifting arm, the positioning camera is provided on one side of the switching component, and the positioning camera is electrically connected to the controller.

9. The rework soldering equipment for producing laminated circuit boards according to claim 2, characterized in that: The centering member also includes a tension spring, a fixing column is fixedly provided on the clamping plate, a first annular groove is provided on the fixing column, a convex column is fixedly provided on one end of the second support arm close to the second abutting wheel, a second annular groove is provided on the convex column, one end of the tension spring is sleeved in the first annular groove, and the other end of the tension spring is sleeved in the second annular groove, the pressure sensor is arranged in the first annular groove, one end of the tension spring is pressed on the pressure sensor, and the pressure sensor is electrically connected to the controller.

10. A soldering method applicable to the rework soldering equipment for producing laminated circuit boards according to any one of claims 1 to 9, characterized in that: The steps include: S1. Place the laminated circuit board to be repaired on a conveyor belt, and start the conveyor belt to transport the laminated circuit board to a preset fixed station; S2. Use the positioning camera to scan and identify the precise location information of the components to be repaired on the stacked circuit board and feed the information back to the controller. The controller controls the displacement assembly to accurately move the actuator assembly (soldering assembly and detection assembly) installed at the end of the lifting arm to the top of the components to be repaired; S3. The controller controls the first motor to drive the active gear to rotate the switching plate and move the welding assembly to the working position. Then, the controller controls the telescopic drive member to move the mounting plate downward. The first drive member drives the two sets of clamping plates closer together. When the centering member contacts the corner of the component, the pressure pump sprays flux onto the pins of the component through the nozzle. S4. The controller then activates the hot air gun to generate high-temperature hot air that blows directly toward the pin solder joint area of ​​the component to be repaired, using the high-temperature hot air to melt the solder at the component pin. During this period, the first driving member drives the two sets of clamping plates to continue to move closer to each other, and the alignment component is used to act on the component to accurately adjust it to the correct designed position of the laminated circuit board pad; S5. When the two sets of clamping plates approach each other, the side of the clamping plate abuts against and squeezes the output end of the second hydraulic rod, causing the output end of the first telescopic rod to retract inward and drive the outer plate to deflect outward, thereby causing the first hydraulic rod to drive the outer plate to deflect and, through the cooperation of the two sets of give way grooves and multiple sets of limit rods, push the inner and outer plates to move, so that the hot air output of the hot air gun is concentrated in one position and then gradually dispersed, protecting the surrounding components; S6. Turn off the hot air gun, and the molten solder cools and solidifies. The controller controls the first motor again to drive the switching plate to rotate, and rotates the detection assembly fixed at the other end of the switching plate to the working position so that it faces the components below that have been reworked. The detection assembly is used to detect the soldering status of the reworked components, evaluate the soldering quality, and feed back the detection results to the controller. S7. After the welding quality inspection is completed, the stacked circuit board falls back onto the conveyor belt, and the conveyor belt is started to transport the repaired stacked circuit board away from the fixed station.

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