PCBA selective welding equipment with reinspection AOI

Abstract

The invention relates to the technical field of PCBA (printed circuit board assembly) welding, in particular to PCBA selective welding equipment with reinspection AOI (automatic optical inspection), which comprises a frame body, a feeding device movably arranged on the frame body, a visual positioning device matched with the feeding device for use and a welding device matched with the feeding device for use, the feeding device is used for feeding PCBA boards to be machined, the visual positioning device is used for conducting visual positioning on the PCBA boards to be machined borne by the feeding device, the welding device is used for conducting welding treatment on the PCBA boards subjected to visual positioning, the frame body is provided with a control system, and the feeding device, the visual positioning device and the welding device are all electrically connected with the control system. Automatic visual inspection is achieved, welding parameters are adjusted in a targeted mode, the welding requirement of a high-quality circuit board is met, the situation of poor welding is avoided, the production cost is reduced, and the welding efficiency and the welding quality are improved.

Description

Technical Field

[0001] This invention relates to the field of PCBA board soldering technology, and in particular to a selective soldering device for PCBA with AOI re-inspection. Background Technology

[0002] Selective wave soldering, also known as selective wave soldering, is a through-hole soldering equipment used for PCB or PCBA components. Due to its different soldering advantages, it is now widely used in through-hole soldering of multilayer board structures with high soldering requirements and complex processes, such as military electronics, aerospace and marine electronics, automotive electronics, and printer equipment. Different solder joints on the same circuit board have different characteristics, such as heat capacity, pin spacing, and solder penetration requirements, and therefore require different soldering parameters. However, the characteristic of selective wave soldering is that it completes the soldering of all solder joints on the entire circuit board under the same set parameters. Therefore, different solder joints need to "compromise" with each other. This makes selective wave soldering difficult to meet the soldering requirements of high-quality circuit boards, and may even produce soldering defects that require resoldering correction, increasing production costs, reducing the long-term reliability of the circuit board, and affecting soldering efficiency and quality. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a PCBA selective soldering device with AOI for re-inspection.

[0004] To achieve the above objectives, the present invention provides a selective soldering device for PCBA with AOI re-inspection, comprising a frame, a feeding device movably mounted on the frame, a vision positioning device used in conjunction with the feeding device, and a welding device used in conjunction with the feeding device. The feeding device is used to carry and transport the PCBA board to be processed, the vision positioning device is used to visually position the PCBA board to be processed carried by the feeding device, and the welding device is used to perform welding processing on the visually positioned PCBA board. The frame is equipped with a control system, and the feeding device, vision positioning device, and welding device are all electrically connected to the control system.

[0005] Preferably, the feeding device includes a feeding assembly, an X-axis driver for driving the feeding assembly to move along the X-axis direction of the frame, and a Y-axis driver for driving the X-axis driver to move along the Y-axis direction of the frame. The feeding assembly includes a frame, a fixed arm disposed on the frame, a movable arm movably disposed on the frame, and a driving component drivenly connected to the movable arm. The X-axis driver is drivenly connected to the frame. The fixed arm is provided with a first suction head, and multiple first suction heads are provided, arranged at intervals along the length direction of the fixed arm. The movable arm is provided with a second suction head, and multiple second suction heads are provided, arranged at intervals along the length direction of the movable arm.

[0006] Preferably, the driving component includes a first lead screw and nut structure, a second lead screw and nut structure spaced apart from the first lead screw and nut structure, a servo motor drivenly connected to the first lead screw and nut structure, a first synchronous pulley disposed on the first lead screw and nut structure, a second synchronous pulley disposed on the second lead screw and nut structure, and a transmission belt drivingly connected between the first synchronous pulley and the second synchronous pulley. The output end of the first lead screw and nut structure is connected to a first connecting plate, and the output end of the second lead screw and nut structure is connected to a second connecting plate. Both the first connecting plate and the second connecting plate are connected to the movable arm.

[0007] Preferably, a first lifting cylinder is provided on the outer side of the fixed arm, and a second lifting cylinder is provided on the outer side of the movable arm. A support plate is provided between the fixed arm and the movable arm, and the output ends of both the first and second lifting cylinders are connected to the support plate.

[0008] Preferably, a first limit sensor is provided at both ends of the frame, and a first sensing baffle is provided at the output end of the second lead screw nut structure to cooperate with the first limit sensor.

[0009] Preferably, the frame is provided with a first guide rail, the X-axis driver is provided with a first slider that is slidably connected to the first guide rail, a second limit sensor is provided at both ends of the frame, the X-axis driver is provided with a second sensing baffle that works in conjunction with the second limit sensor, the frame is provided with a second guide rail, the frame is provided with a second slider that is slidably connected to the second guide rail, a third limit sensor is provided at both ends of the frame, and the frame is provided with a third sensing baffle that works in conjunction with the third limit sensor.

[0010] Preferably, the visual positioning device includes a stand, a light source mounted on the stand, an adjustment plate mounted on the front side of the stand, and a CCD camera mounted on the adjustment plate. The light source is located above the CCD camera. The adjustment plate has a first adjustment groove. The CCD camera has a fastening plate. The outer side of the CCD camera has a connection hole. The fastening plate has a fastening hole communicating with the connection hole and the first adjustment groove. The outer side of the adjustment plate has an outer cover surrounding the CCD camera.

[0011] Preferably, adjustment blocks are provided on both sides of the light source component. The adjustment blocks are L-shaped. A second adjustment groove is provided at the end of the adjustment block near the support frame. Mounting holes communicating with the second adjustment groove are provided on both sides of the support frame.

[0012] Preferably, the welding device includes a base, a movable platform movably disposed on the base, a welding head movably disposed on the movable platform, a Z-axis driver driven by the welding head, and a flux nozzle disposed on the base. The flux nozzle is located beside the welding head. The base is provided with a stand, the flux nozzle is provided with a height adjustment plate, the height adjustment plate is provided with a height adjustment groove, and the stand is provided with a fixing hole communicating with the height adjustment groove.

[0013] Preferably, the base is provided with a third guide rail, the mobile platform is provided with a third slider that is slidably connected to the third guide rail, and both ends of the base are provided with limit blocks, which abut against the outer wall of the mobile platform.

[0014] The beneficial effects of this invention are: to achieve automated visual inspection and targeted adjustment of welding parameters, to meet the welding requirements of high-quality circuit boards, to avoid welding defects, to reduce production costs, and to improve welding efficiency and welding quality. Attached Figure Description

[0015] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the feeding device of the present invention.

[0018] Figure 3 This is a schematic diagram of the feeding assembly structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the visual positioning device of the present invention.

[0020] Figure 5 This is an exploded structural diagram of the visual positioning device of the present invention.

[0021] Figure 6 This is a schematic diagram of the welding device structure of the present invention.

[0022] The reference numerals in the figures include: 1—Frame 11—First Guide Rail 12—Second Limit Sensor 13 - Second guide rail; 14 - Third limit sensor 2—Feeding device 21—Feeding assembly 211—Frame 212 – Fixed arm; 213 – Movable arm 214—Driver component; 2141—First lead screw and nut structure; 2142—Second lead screw and nut structure 2143 — Servo motor; 2144 — First synchronous pulley; 2145 — Second synchronous pulley 2146 — Drive belt 2147 — First connecting plate 2148 — Second connecting plate 215 – First suction head; 216 – Second suction head; 217 – First lifting cylinder 218 – Second lifting cylinder; 219 – Support plate; 2110 – First limit sensor 2111 — First sensing baffle; 2112 — Second slider; 2113 — Third sensing baffle 22 — X-axis driver 23 — Y-axis driver 24 — First slider 25 - Second sensor baffle 3—Visual positioning device; 31—Standing frame; 32—Light source component 33 – Adjustment plate; 34 – CCD camera; 35 – First adjustment slot 36 – Fastening plate; 37 – Connecting hole; 38 – Fastening hole 39—Outer cover; 310—Adjusting block; 311—Second adjusting groove 312 - Mounting Hole 4—Welding device; 41—Base; 42—Mobile platform 43—Welding head 44—Z-axis driver 45—Fluoride nozzle 46 – Stand; 47 – Height Adjustment Plate; 48 – Height Adjustment Slot 49 – Fixing hole; 410 – Third guide rail; 411 – Third slider 412 - Limiting Block 5—Control System. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1 to 6As shown, a selective soldering device for PCBA with AOI re-inspection according to the present invention includes a frame 1, a feeding device 2 movably disposed on the frame 1, a vision positioning device 3 used in conjunction with the feeding device 2, and a welding device 4 used in conjunction with the feeding device 2. The feeding device 2 is used to carry and transport the PCBA board to be processed. The vision positioning device 3 is used to perform visual positioning on the PCBA board to be processed carried by the feeding device 2. The welding device 4 is used to perform welding processing on the PCBA board after visual positioning. The frame 1 is provided with a control system 5. The feeding device 2, the vision positioning device 3, and the welding device 4 are all electrically connected to the control system 5.

[0026] During operation, the feeding device 2 carries and transports the PCBA board to be processed, moving it to the position of the vision positioning device 3. The vision positioning device 3 performs position correction and compensation on the PCBA board carried by the feeding device 2 to comprehensively understand the position of each solder joint. The detection data is then sent to the control system 5. After further analysis and processing of the detection data, the control system 5 controls the welding device 4 to adjust the welding parameters of each solder joint, such as flux application amount, welding time, and welding peak height, to the optimal state. Then, the feeding device 2 moves the PCBA board to the position of the welding device 4. The welding device 4 performs precise welding work on each solder joint of the PCBA board according to the set welding parameters, effectively reducing the welding defect rate and achieving a zero-defect welding effect for through holes. The welding parameters of each solder joint can be "tailor-made," eliminating the need for compromise. This invention realizes automated visual inspection and targeted adjustment of welding parameters to meet the welding requirements of high-quality circuit boards, avoid welding defects, reduce production costs, and improve welding efficiency and quality.

[0027] The feeding device 2 in this embodiment includes a feeding assembly 21, an X-axis driver 22 for driving the feeding assembly 21 to move along the X-axis direction of the frame 1, and a Y-axis driver 23 for driving the X-axis driver 22 to move along the Y-axis direction of the frame 1. The feeding assembly 21 includes a frame 211, a fixed arm 212 disposed on the frame 211, a movable arm 213 movably disposed on the frame 211, and a driving member 214 drivenly connected to the movable arm 213. The X-axis driver 22 is drivenly connected to the frame 211. The fixed arm 212 is provided with a first suction head 215, and multiple first suction heads 215 are provided, which are spaced apart along the length direction of the fixed arm 212. The movable arm 213 is provided with a second suction head 216, and multiple second suction heads 216 are provided, which are spaced apart along the length direction of the movable arm 213. Specifically, both the X-axis driver 22 and the Y-axis driver 23 are existing linear modules. The X-axis driver 22 drives the feeding assembly 21 to move along the X-axis direction of the frame 1, and the Y-axis driver 23 drives the X-axis driver 22 to move along the Y-axis direction of the frame 1. The feeding assembly 21 is driven to move left and right and forward and backward through the cooperation between the X-axis driver 22 and the Y-axis driver 23. Since the driving component 214 can drive the movable arm 213 to move closer to or away from the fixed arm 212, the distance between the movable arm 213 and the fixed arm 212 can be adjusted according to the different sizes and specifications of PCBA boards, resulting in high work compatibility. In addition, multiple first suction heads 215 are arranged at intervals along the length direction of the fixed arm 212, and multiple second suction heads 216 are arranged at intervals along the length direction of the movable arm 213. The multiple first suction heads 215 and multiple second suction heads 216 can stably adsorb and smoothly transfer PCBA boards, resulting in high feeding efficiency.

[0028] The driving component 214 in this embodiment includes a first lead screw nut structure 2141, a second lead screw nut structure 2142 spaced apart from the first lead screw nut structure 2141, a servo motor 2143 drivenly connected to the first lead screw nut structure 2141, a first synchronous pulley 2144 disposed on the first lead screw nut structure 2141, a second synchronous pulley 2145 disposed on the second lead screw nut structure 2142, and a transmission belt 2146 drivingly connected between the first synchronous pulley 2144 and the second synchronous pulley 2145. The output end of the first lead screw nut structure 2141 is connected to a first connecting plate 2147, and the output end of the second lead screw nut structure 2142 is connected to a second connecting plate 2148. Both the first connecting plate 2147 and the second connecting plate 2148 are connected to the movable arm 213. Specifically, the servo motor 2143 drives the first lead screw nut structure 2141 to rotate. On one hand, the rotating first lead screw nut structure 2141 drives the first synchronous pulley 2144 to rotate synchronously. Since the first synchronous pulley 2144 drives the second synchronous pulley 2145 to rotate through the transmission belt 2146, the rotating second synchronous pulley 2145 further drives the second lead screw nut structure 2142 to rotate. On the other hand, the rotating first lead screw nut structure 2141 drives the first connecting plate 2147 to move along the length direction of the frame 211. At the same time, the rotating second lead screw nut structure 2142 drives the second connecting plate 2148 to move along the length direction of the frame 211. Since both the first connecting plate 2147 and the second connecting plate 2148 are connected to the movable arm 213, the driving component 214 and the movable arm 213 are connected, effectively driving the movable arm 213 to move closer to or away from the fixed arm 212, adjusting the distance between the movable arm 213 and the fixed arm 212. This method is highly practical and versatile.

[0029] In this embodiment, a first lifting cylinder 217 is provided on the outer side of the fixed arm 212, and a second lifting cylinder 218 is provided on the outer side of the movable arm 213. A support plate 219 is provided between the fixed arm 212 and the movable arm 213, and the output ends of the first lifting cylinder 217 and the second lifting cylinder 218 are both connected to the support plate 219. Specifically, a first lifting cylinder 217 is provided on the outer side of the fixed arm 212, and a second lifting cylinder 218 is provided on the outer side of the movable arm 213. The output ends of the first lifting cylinder 217 and the second lifting cylinder 218 are both connected to the support plate 219. When the first lifting cylinder 217 and the second lifting cylinder 218 drive the support plate 219 to move downward, the support plate 219 fits against the middle of the PCBA board, ensuring that while the movable arm 213 and the fixed arm 212 stably adsorb the two sides of the PCBA board, they provide stable and reliable support for the middle of the PCBA board, thus preventing the middle of the PCBA board from bending and tilting due to insufficient support and uneven force, which would affect the welding quality.

[0030] In this embodiment, a first limit sensor 2110 is provided at both ends of the frame 211, and a first sensing baffle 2111 is provided at the output end of the second lead screw nut structure 2142 to cooperate with the first limit sensor 2110. Specifically, when the first limit sensor 2110 detects the obstruction of the first sensing baffle 2111, it immediately sends a signal to the servo motor 2143 to control the servo motor 2143 to stop operating, thereby effectively limiting the displacement distance of the movable arm 213, with good limiting effect and high degree of automation.

[0031] In this embodiment, the frame 1 is provided with a first guide rail 11, the X-axis driver 22 is provided with a first slider 24 that is slidably connected to the first guide rail 11, the two ends of the frame 1 are provided with second limit sensors 12, the X-axis driver 22 is provided with a second sensing baffle 25 that cooperates with the second limit sensors 12, the frame 1 is provided with a second guide rail 13, the frame 211 is provided with a second slider 2112 that is slidably connected to the second guide rail 13, the two ends of the frame 1 are provided with a third limit sensor 14, and the frame 211 is provided with a third sensing baffle 2113 that cooperates with the third limit sensor 14. Specifically, when the Y-axis driver 23 drives the X-axis driver 22 to move along the Y-axis direction of the frame 1, the X-axis driver 22 is slidably connected to the first guide rail 11 via the first slider 24, resulting in smooth and efficient movement. When the second limit sensor 12 detects the obstruction of the second sensing baffle 25, it immediately sends a signal to the Y-axis driver 23, controlling the Y-axis driver 23 to stop operating, thereby effectively limiting the displacement distance of the X-axis driver 22, resulting in a good limiting effect. When the X-axis driver 22 drives the feeding assembly 21 to move along the X-axis direction of the frame 1, the frame 211 is slidably connected to the second guide rail 13 via the second slider 2112, resulting in smooth and efficient movement. When the third limit sensor 14 detects the obstruction of the third sensing baffle 2113, it immediately sends a signal to the X-axis driver 22, controlling the X-axis driver 22 to stop operating, thereby effectively limiting the displacement distance of the feeding assembly 21, resulting in a good limiting effect.

[0032] The visual positioning device 3 of this embodiment includes a stand 31, a light source 32 disposed on the stand 31, an adjustment plate 33 disposed on the front side of the stand 31, and a CCD camera 34 disposed on the adjustment plate 33. The light source 32 is located above the CCD camera 34. The adjustment plate 33 is provided with a first adjustment groove 35. The CCD camera 34 is provided with a fastening plate 36. The outer side of the CCD camera 34 is provided with a connection hole 37. The fastening plate 36 is provided with a fastening hole 38 communicating with the connection hole 37 and the first adjustment groove 35. The outer side of the adjustment plate 33 is provided with an outer cover 39, which surrounds the CCD camera 34. Specifically, the light source 32 is set on the top of the stand 31, and the light source 32 is located above the CCD camera 34. The CCD camera 34 can be adjusted up and down relative to the adjustment plate 33. Then, external screws are used to pass through the connecting hole 37 and the first adjustment groove 35 in sequence and then connect and fix it to the fastening hole 38. Through the cooperation between the CCD camera 34 and the fastening plate 36, the CCD camera 34 is positioned after the height is adjusted. The height adjustment effect is good and the versatility is strong.

[0033] In this embodiment, the light source component 32 has adjustment blocks 310 on both sides. The adjustment blocks 310 have an L-shaped structure, and a second adjustment groove 311 is provided at the end of the adjustment block 310 near the support frame 31. Mounting holes 312 communicating with the second adjustment grooves 311 are provided on both sides of the support frame 31. Specifically, the light source component 32 can be adjusted vertically relative to the support frame 31. Preferably, six mounting holes 312 are provided. External screws are used to pass through the second adjustment grooves 311 and then connect and fix to the mounting holes 312, thereby positioning the light source component 32 after height adjustment. This results in good height adjustment and strong versatility.

[0034] The welding device 4 in this embodiment includes a base 41, a movable platform 42 movably disposed on the base 41, a welding head 43 movably disposed on the movable platform 42, a Z-axis driver 44 drivenly connected to the welding head 43, and a flux nozzle 45 disposed on the base 41. The flux nozzle 45 is located beside the welding head 43. The base 41 is provided with a stand 46, the flux nozzle 45 is provided with a height adjustment plate 47, the height adjustment plate 47 is provided with a height adjustment groove 48, and the stand 46 is provided with a fixing hole 49 communicating with the height adjustment groove 48. Specifically, the feeding device 2 moves the PCBA board to the welding device 4. The flux nozzle 45 is located beside the welding head 43. First, the flux in the flux tank enters the flux nozzle 45 under low pressure or pump pressure. The flux nozzle 45 mixes the pressurized flux with ultrasonic vibration, directly atomizing the flux into particles smaller than 38μm. This results in finer spraying and a lower risk of clogging, thus accurately and evenly spraying the flux onto the designated hole positions on the PCBA board. The main function of the flux is to remove oxides from the solder and the surface of the PCBA board, achieving the necessary cleanliness of the metal surface and preventing soldering defects. The surface of the flux nozzle 45 is re-oxidized, which reduces the surface tension of the solder and improves the welding performance. The flux nozzle 45 moves up and down relative to the stand 46 through the height adjustment plate 47 to adjust the working height position. After the external screw passes through the height adjustment groove 48, it is connected and fixed to the fixing hole 49, thereby fixing the position of the flux nozzle 45 after adjusting the working height position. The adjustment is simple and convenient, and the work compatibility is high. Then, the Z-axis driver 44 drives the welding head 43 to move upward and approach the specified hole position on the PCBA board. The welding head 43 performs fine welding work on each solder point of the PCBA board according to the set welding parameters.

[0035] In this embodiment, the base 41 is provided with a third guide rail 410, and the moving platform 42 is provided with a third slider 411 slidably connected to the third guide rail 410. Limiting blocks 412 are provided at both ends of the base 41, and the limiting blocks 412 abut against the outer wall of the moving platform 42. Specifically, the moving platform 42 is driven by an external driving mechanism, such as a cylinder or linear module. The moving platform 42 is slidably connected to the third guide rail 410 via the third slider 411, thereby adjusting the position of the welding head 43 according to different work requirements. Two limiting blocks 412 are provided at both ends of the base 41. When the limiting blocks 412 abut against the outer wall of the moving platform 42, the displacement distance of the moving platform 42 is limited, resulting in a significant limiting effect.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A selective soldering apparatus with re-inspection AOI for PCBA, characterized in that: Including frame, the feeding device that is movably arranged in the frame, the visual positioning device that is used with the feeding device and the welding device that is used with the feeding device, the feeding device is used to carry and transport the PCBA board to be processed, the visual positioning device is used for visual positioning to the PCBA board to be processed carried by the feeding device, the welding device is used for welding treatment to the PCBA board after visual positioning, the frame is provided with control system, the feeding device, visual positioning device, welding device are electrically connected with control system.

2. The selective soldering equipment with AOI re-inspection for PCBA according to claim 1, characterized in that: The feeding device includes a feeding assembly, an X-axis driver for driving the feeding assembly to move along the X-axis direction of the frame, and a Y-axis driver for driving the X-axis driver to move along the Y-axis direction of the frame. The feeding assembly includes a frame, a fixed arm arranged on the frame, a movable arm movably arranged on the frame, and a driving member drivingly connected with the movable arm. The X-axis driver is drivingly connected with the frame. The fixed arm is provided with a plurality of first suction heads arranged at intervals along the length direction of the fixed arm. The movable arm is provided with a plurality of second suction heads arranged at intervals along the length direction of the movable arm.

3. The selective soldering equipment with AOI re-inspection for PCBA according to claim 2, characterized in that: The driving member includes a first lead screw nut structure, a second lead screw nut structure arranged at intervals with the first lead screw nut structure, a servo motor drivingly connected with the first lead screw nut structure, a first synchronous wheel arranged on the first lead screw nut structure, a second synchronous wheel arranged on the second lead screw nut structure, and a transmission belt drivingly connected between the first synchronous wheel and the second synchronous wheel. The output end of the first lead screw nut structure is connected with a first connecting plate. The output end of the second lead screw nut structure is connected with a second connecting plate. The first connecting plate and the second connecting plate are both connected with the movable arm.

4. The selective soldering equipment with AOI re-inspection for PCBA according to claim 2, characterized in that: The outer side of the fixed arm is provided with a first lifting cylinder, and the outer side of the movable arm is provided with a second lifting cylinder. A supporting plate is arranged between the fixed arm and the movable arm. The output end of the first lifting cylinder and the output end of the second lifting cylinder are both connected with the supporting plate.

5. The selective soldering equipment with AOI re-inspection for PCBA according to claim 3, characterized in that: Both ends of the frame are provided with a first limit sensor. The output end of the second lead screw nut structure is provided with a first sensing baffle cooperatively used with the first limit sensor.

6. The selective soldering equipment with re-inspection AOI for PCBA according to claim 2, characterized in that: The frame is provided with a first guide rail. The X-axis driver is provided with a first sliding block slidingly connected with the first guide rail. Both ends of the frame are provided with a second limit sensor. The X-axis driver is provided with a second sensing baffle cooperatively used with the second limit sensor. The frame is provided with a second guide rail. The frame is provided with a second sliding block slidingly connected with the second guide rail. Both ends of the frame are provided with a third limit sensor. The frame is provided with a third sensing baffle cooperatively used with the third limit sensor.

7. The selective soldering equipment with re-inspection AOI for PCBA according to claim 1, characterized in that: The visual positioning device comprises a stand, a light source part arranged on the stand, an adjusting plate arranged on the front side of the stand, and a CCD camera arranged on the adjusting plate, the light source part is located above the CCD camera, the adjusting plate is provided with a first adjusting groove, the CCD camera is provided with a fastening plate, the outer side of the CCD camera is provided with a connecting hole, the fastening plate is provided with a fastening hole in communication with the connecting hole and the first adjusting groove, the outer side of the adjusting plate is provided with an outer cover, and the outer cover surrounds the CCD camera.

8. The selective soldering equipment with re-inspection AOI for PCBA according to claim 7, characterized in that: The two sides of the light source part are provided with adjusting blocks, the adjusting blocks are in L-shaped structure, one end of the adjusting block close to the stand is provided with a second adjusting groove, and the two sides of the stand are provided with mounting holes in communication with the second adjusting grooves.

9. The selective soldering equipment with AOI for re-inspecting the PCBA according to claim 1, characterized in that: The welding device comprises a base, a moving platform movably arranged on the base, a welding head movably arranged on the moving platform, a Z-axis driver in driving connection with the welding head, and a flux spraying head arranged on the base, the flux spraying head is located beside the welding head, the base is provided with a stand, the flux spraying head is provided with a height adjusting plate, the height adjusting plate is provided with a height adjusting groove, and the stand is provided with a fixing hole in communication with the height adjusting groove.

10. The selective soldering apparatus with AOI re-inspection for PCBA according to claim 9, characterized in that: The base is provided with a third guide rail, the moving platform is provided with a third sliding block in sliding connection with the third guide rail, and the two ends of the base are provided with limiting blocks, the limiting blocks abut against the outer wall of the moving platform.

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