PCB welding device

Abstract

The invention relates to the technical field of welding devices, and discloses a PCB welding device which comprises a base, a rotating disc is rotationally arranged on the upper surface of the base, and a plurality of containing grooves used for containing PCBs are formed in the upper surface of the rotating disc in a circumferential array mode; the welding assembly comprises an L-shaped mounting plate fixedly arranged on the outer surface of the base and a first strip-shaped frame arranged on the side face of the L-shaped mounting plate in a sliding mode, a second strip-shaped frame is arranged on the surface of the first strip-shaped frame in a sliding mode, and a mounting block is arranged on the lower surface of the second strip-shaped frame in a sliding mode; the welding assembly further comprises an electric soldering iron fixedly arranged at the bottom end of the mounting block and a soldering tin column arranged on the side face of the mounting block. By arranging the welding assembly, when the welding device is used for welding a PCB, automatic welding can be achieved, the positions of an electric soldering iron and a soldering tin column can be adjusted, then different positions on the PCB can be automatically welded, and the welding efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a PCB welding device. Background Art

[0002] PCB soldering refers to the process of connecting electronic components to wires or pads on the PCB printed circuit board.

[0003] At present, when soldering PCB boards, the traditional manual method is for a person to hold a soldering iron in one hand and solder the solder wire in the other hand. This soldering method is only suitable for soldering a small number of PCB boards. When a large number of PCB boards need to be soldered, this manual soldering method leads to low soldering efficiency and it is difficult to ensure the quality after soldering.

[0004] To this end, the present invention provides a PCB board welding device. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The present invention provides a PCB board welding device, comprising: A base, wherein a rotating disk is rotatably provided on the upper surface of the base, and a plurality of placement slots for placing PCB boards are provided in a circular array on the upper surface of the rotating disk; A welding assembly is used for welding a PCB board placed inside a placement slot, the welding assembly comprising an L-shaped mounting plate fixedly mounted on the outer surface of a base, and a first bar frame slidably mounted on the side of the L-shaped mounting plate, a second bar frame slidably mounted on the surface of the first bar frame, a mounting block slidably mounted on the lower surface of the second bar frame, a first motor for driving the first bar frame to rise and fall is fixedly mounted on the top of the L-shaped mounting plate, a second motor for driving the second bar frame to slide is fixedly mounted on the surface of the first bar frame, a third motor for driving the mounting block to move is fixedly mounted on the surface of the second bar frame, the welding assembly also comprising an electric soldering iron fixedly mounted on the bottom end of the mounting block, and a solder column mounted on the side of the mounting block.

[0007] The ejector assembly is used to drive the solder column to be automatically ejected when the soldering iron is close to the PCB board.

[0008] Preferably, a first rectangular groove is provided on the inner wall of the L-shaped mounting plate, and the output end of the first motor extends into the interior of the first rectangular groove and is fixedly provided with a first threaded column, a first slider is slidably provided on the inner wall of the first rectangular groove, and a first threaded hole is provided on the surface of the first slider which is threadedly connected to the outer surface of the first threaded column, and an end of the first slider is fixedly connected to the surface of the first bar frame.

[0009] By adopting the above technical solution, the first threaded column can be driven to rotate by the rotation of the first motor, and the rotation of the first threaded column can drive the first slider to move downward automatically, thereby driving the soldering iron and the solder column to automatically approach the PCB board.

[0010] Preferably, the output end of the second motor extends to the interior of the first bar frame and is fixedly provided with a second threaded column, the inner wall of the first bar frame is slidably provided with a second slider, the surface of the second slider is provided with a threaded hole threadedly connected to the outer surface of the second threaded column, and the end of the second slider is fixedly connected to the end of the second bar frame.

[0011] By adopting the above technical solution, the rotation of the second motor can drive the second threaded column to rotate, the rotation of the second threaded column can drive the second slider to move, and the movement of the second slider can drive the soldering iron and the solder column to move longitudinally, thereby realizing the adjustment of the longitudinal position of the soldering iron and the solder column.

[0012] Preferably, the output end of the third motor extends to the interior of the second bar frame and is fixed with a third threaded column, and the outer surface of the top end of the mounting block is slidably connected to the inner wall of the second bar frame, and the side of the mounting block is provided with a third threaded hole threadedly connected to the outer surface of the third threaded column.

[0013] By adopting the above technical solution, the rotation of the third motor can drive the third threaded column to rotate, and the rotation of the third threaded column can drive the mounting block to move, thereby realizing the adjustment of the lateral position of the electric soldering iron and the solder column.

[0014] Preferably, the ejection assembly includes a positioning cylinder fixed to the side of the mounting block through a mounting rod, and a sealing piston slidably arranged on the inner wall of the positioning cylinder, a plug-in groove is provided on the surface of the sealing piston, and the end of the solder column is plugged into the inside of the plug-in groove.

[0015] By adopting the above technical solution, the solder column can be effectively inserted into the insertion slot, thereby achieving effective fixation of the solder column.

[0016] Preferably, four connecting columns are fixedly provided at the bottom end of the positioning cylinder in a circular array, and a limiting ring is fixedly provided at the bottom end of the four connecting columns, and four spring sheets for limiting the solder column are fixedly provided on the inner wall of the limiting ring in a circular array.

[0017] By adopting the above technical solution, the solder column can be effectively limited under the action of the limiting ring and the spring sheet.

[0018] Preferably, the ejection assembly also includes a fixing plate fixed to the side of the L-shaped mounting plate, and a small push-type air pump fixed to the upper surface of the fixing plate, and a pressing plate for pressing the small push-type air pump is fixed to the lower surface of the first strip frame.

[0019] By adopting the above technical solution, the small push-type air pump can be pressed by the pressing plate.

[0020] Preferably, a return spring is provided inside the small push-type air pump, and an air intake pipe and an air inflation pipe extending to the lower surface of the fixed plate are respectively provided at the ends of the small push-type air pump, and an air intake one-way valve and an air inflation one-way valve are respectively provided on the surfaces of the air intake pipe and the air inflation pipe, and a hose extending to the inside of the positioning tube is fixedly provided at the other end of the air inflation pipe.

[0021] By adopting the above technical solution, when the small push-type air pump is pressed, the air tube and the hose can transport air to the inside of the positioning tube, thereby achieving the purpose of automatically ejecting the solder column.

[0022] Preferably, a driving component is provided inside the L-shaped mounting plate for driving the rotating disk to rotate to realize PCB board switching during the process of lifting and resetting the soldering iron, and the driving component includes a second rectangular groove opened on the inner wall of the L-shaped mounting plate, and the bottom end of the first threaded column extends to the inside of the second rectangular groove and is provided with a vertical rod rotatably connected to the bottom wall of the second rectangular groove, and a ratchet mechanism is provided at the bottom end of the first threaded column and the top end of the vertical rod.

[0023] By adopting the above technical solution, the ratchet mechanism can be used to drive the vertical rod to rotate when the first motor drives the first threaded column to rotate and drive the soldering iron and the solder column to move downward. In the process of the first motor reversing and driving the first threaded column to rotate in the opposite direction, the vertical rod will not be driven to rotate due to the action of the ratchet mechanism.

[0024] Preferably, a connecting plate is fixedly provided on the inner bottom wall of the L-shaped mounting plate, and a cross bar passing through the connecting plate is rotatably provided on the surface of the connecting plate, a rotating column rotatably connected to the upper surface of the base is fixedly provided on the lower surface of the rotating disk, and one end of the cross bar and the surface of the vertical bar are fixedly provided with a first bevel gear meshing with each other, the other end of the cross bar is fixedly provided with a second bevel gear, and the surface of the rotating column is fixedly provided with a bevel gear ring meshing with the second bevel gear.

[0025] By adopting the above technical solution, the horizontal rod can be driven to rotate by the rotation of the vertical rod, and the rotating column can be driven to rotate automatically by the rotation of the horizontal rod.

[0026] The beneficial effects of the present invention are: The PCB board welding device described in the present invention can realize automatic welding when welding the PCB board by setting a welding component, and can adjust the position of the electric soldering iron and the solder column, so as to realize automatic welding at different positions on the PCB board, thereby effectively improving the welding efficiency.

[0027] The PCB welding device of the present invention can realize the purpose of automatically ejecting the solder column during the process of welding the PCB board by using an electric soldering iron and a solder column, thereby ensuring the quality of welding.

[0028] The PCB board welding device described in the present invention can achieve the purpose of automatically switching the PCB boards after welding by setting a driving component, thereby further improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3 It is a side structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the first bar frame and the second bar frame of the present invention; Figure 5 The present invention Figure 4 The enlarged structural diagram at A in the middle; Figure 6 It is a schematic diagram of the three-dimensional structure of the positioning tube of the present invention; Figure 7 It is a schematic diagram of the positioning tube structure when viewed from above of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the positioning tube of the present invention.

[0030] Description of reference numerals: 100, base; 200, rotating disk; 300, placement slot; 400, welding assembly; 401, L-shaped mounting plate; 402, first bar frame; 403, second bar frame; 404, mounting block; 405, first motor; 406, second motor; 407, third motor; 408, electric soldering iron; 409, solder column; 4010, first threaded column; 4011, first slider; 4012, second threaded column; 4013, second slider; 4014, third threaded column; 500, ejector assembly; 501, positioning cylinder; 502, sealing piston; 503, plug-in slot; 504, limiting ring; 505, spring sheet; 506, fixing plate; 507, small push-type air pump; 508, pressing plate; 509, suction pipe; 5010, inflation pipe; 5011, suction one-way valve; 5012, inflation one-way valve; 5013, hose; 600, driving assembly; 601, vertical rod; 602, ratchet mechanism; 603, horizontal rod; 604, rotating column; 605, first bevel gear; 606, second bevel gear; 607, bevel gear ring. DETAILED DESCRIPTION

[0031] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples. Example

[0032] The following is a further detailed description of the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments. Figures 1 to 8 , this application provides a PCB board welding device, please refer to Figures 1 to 5 , comprising: a base 100, a rotating disk 200 is rotatably provided on the upper surface of the base 100, and a plurality of placement grooves 300 for placing PCB boards are provided on the upper surface of the rotating disk 200 in a circumferential array; a welding assembly 400, which is used to weld the PCB board placed inside the placement groove 300, and the welding assembly 400 comprises an L-shaped mounting plate 401 fixedly provided on the outer surface of the base 100, and a first strip frame 402 slidably provided on the side of the L-shaped mounting plate 401, and a second strip frame 400 is slidably provided on the surface of the first strip frame 402 3. A mounting block 404 is slidably provided on the lower surface of the second bar frame 403, and a first motor 405 for driving the first bar frame 402 to rise and fall is fixedly provided on the top of the L-shaped mounting plate 401. A second motor 406 for driving the second bar frame 403 to slide is fixedly provided on the surface of the first bar frame 402. A third motor 407 for driving the mounting block 404 to move is fixedly provided on the surface of the second bar frame 403. The welding assembly 400 further includes an electric soldering iron 408 fixedly provided on the bottom end of the mounting block 404, and a soldering column 409 provided on the side of the mounting block 404.

[0033] Please refer to Figure 3 and Figure 4A first rectangular groove is formed on the inner wall of the L-shaped mounting plate 401, and the output end of the first motor 405 extends to the inside of the first rectangular groove and is fixedly provided with a first threaded column 4010, a first slider 4011 is slidably provided on the inner wall of the first rectangular groove, and a first threaded hole threadedly connected to the outer surface of the first threaded column 4010 is formed on the surface of the first slider 4011, and the end of the first slider 4011 is fixedly connected to the surface of the first bar frame 402.

[0034] Specifically, the rotation of the first motor 405 can drive the first threaded column 4010 to rotate, and the rotation of the first threaded column 4010 can drive the first slider 4011 to automatically move downward, thereby driving the electric soldering iron 408 and the solder column 409 to automatically approach the PCB board.

[0035] Please refer to Figure 3 and Figure 4 The output end of the second motor 406 extends to the interior of the first bar frame 402 and is fixedly provided with a second threaded column 4012. A second slider 4013 is slidably provided on the inner wall of the first bar frame 402. A threaded hole threadedly connected to the outer surface of the second threaded column 4012 is opened on the surface of the second slider 4013, and the end of the second slider 4013 is fixedly connected to the end of the second bar frame 403.

[0036] Specifically, the second motor 406 can drive the second threaded column 4012 to rotate, the rotation of the second threaded column 4012 can drive the second slider 4013 to move, and the movement of the second slider 4013 can drive the soldering iron 408 and the solder column 409 to move longitudinally, thereby adjusting the longitudinal positions of the soldering iron 408 and the solder column 409.

[0037] Please refer to Figure 3 and Figure 4 The output end of the third motor 407 extends to the interior of the second bar frame 403 and is fixed with a third threaded column 4014, and the outer surface of the top end of the mounting block 404 is slidably connected to the inner wall of the second bar frame 403, and the side of the mounting block 404 is provided with a third threaded hole threadedly connected to the outer surface of the third threaded column 4014.

[0038] Specifically, the third motor 407 can be rotated to drive the third threaded column 4014 to rotate, and the rotation of the third threaded column 4014 can drive the mounting block 404 to move, thereby adjusting the lateral positions of the electric soldering iron 408 and the solder column 409.

[0039] The present invention provides a welding assembly 400 so that the welding device can place the PCB board in the placement groove 300 when welding the PCB board, and then start the first motor 405 to drive the first threaded column 4010 to rotate, and the rotation of the first threaded column 4010 drives the first slider 4011 to move downward, and the downward movement of the first slider 4011 drives the electric soldering iron 408 and the solder column 409 to automatically move downward to the surface of the PCB board to achieve automatic welding. When welding is required at other positions on the PCB board, the second motor 406 or the third motor 407 can be started before starting the first motor 405, and the first motor 406 or the third motor 407 can be started before starting the first motor 405. The rotation of the second motor 406 drives the second threaded column 4012 to rotate, and the rotation of the second threaded column 4012 drives the second slider 4013 to move, and the movement of the second slider 4013 drives the soldering iron 408 and the solder column 409 to move longitudinally. At the same time, the rotation of the third motor 407 drives the third threaded column 4014 to rotate, and the rotation of the third threaded column 4014 drives the mounting block 404 to move horizontally, thereby driving the soldering iron 408 and the solder column 409 to move horizontally, thereby adjusting the positions of the soldering iron 408 and the solder column 409, and then being able to realize automatic soldering at different positions on the PCB board, effectively improving the welding efficiency. Example

[0040] On the basis of the first embodiment, and different from the first embodiment, A PCB board welding device, please refer to Figures 5 to 8 , and also includes: an ejection component 500, which is used to drive the solder column 409 to automatically eject when the electric soldering iron 408 approaches the PCB board.

[0041] Please refer to Figures 5 to 8 The ejection assembly 500 includes a positioning cylinder 501 fixed to the side of the mounting block 404 through a mounting rod, and a sealing piston 502 slidably arranged on the inner wall of the positioning cylinder 501. The surface of the sealing piston 502 is provided with a plug-in groove 503, and the end of the solder column 409 is plugged into the inside of the plug-in groove 503.

[0042] Specifically, the solder column 409 can be effectively inserted into the insertion slot 503 to achieve effective fixation of the solder column 409 .

[0043] Please refer to Figure 8 The bottom end of the positioning cylinder 501 is fixed with four connecting columns in a circular array, and the bottom ends of the four connecting columns are fixed with a limiting ring 504. The inner wall of the limiting ring 504 is fixed with four spring sheets 505 in a circular array for limiting the solder column 409.

[0044] Specifically, under the action of the limiting ring 504 and the spring sheet 505 , the solder column 409 can be effectively limited.

[0045] Please refer to Figure 5 and Figure 8 The ejection assembly 500 also includes a fixing plate 506 fixed on the side of the L-shaped mounting plate 401, and a small push-type air pump 507 fixed on the upper surface of the fixing plate 506, and a pressing plate 508 for pressing the small push-type air pump 507 is fixed on the lower surface of the first strip frame 402.

[0046] Specifically, the small push-type air pump 507 can be pressed by the pressing plate 508 .

[0047] Please refer to Figure 5 and Figure 8 A return spring is arranged inside the small push-type air pump 507, and an air intake pipe 509 and an air charging pipe 5010 extending to the lower surface of the fixed plate 506 are respectively arranged at the ends of the small push-type air pump 507, and an air intake one-way valve 5011 and an air charging one-way valve 5012 are respectively arranged on the surfaces of the air intake pipe 509 and the air charging pipe 5010, and a hose 5013 extending to the inside of the positioning cylinder 501 is fixedly provided at the other end of the air charging pipe 5010.

[0048] Specifically, the small push-type air pump 507 can be pressed, and the air tube 5010 and the hose 5013 can transport air to the interior of the positioning tube 501 to achieve the purpose of automatically ejecting the solder column 409.

[0049] The present invention provides an ejector assembly 500. During the process of soldering the PCB board by the electric soldering iron 408 and the soldering column 409, after each soldering, the end of the soldering column 409 is shortened due to the melting of the soldering column 409. At this time, when soldering the next location of the PCB board, the first motor 405 can be started to rotate in reverse to drive the electric soldering iron 408 and the soldering column 409 to lift and reset, and then the first motor 405 can be started to rotate in the forward direction to drive the electric soldering iron 408 and the soldering column 409 to move downward to the next soldering location. The first slider 401 The downward movement of the first bar frame 402 can drive the first bar frame 402 to move downward. After the first bar frame 402 moves downward to the specified position, it can drive the pressing plate 508 to press the small push-type air pump 507, so that the gas in the small push-type air pump 507 can be filled into the positioning cylinder 501 through the inflation tube 5010, thereby driving the sealing piston 502 in the positioning cylinder 501 to move. The movement of the sealing piston 502 drives the solder column 409 to automatically extend from the inside of the positioning cylinder 501, thereby achieving the purpose of automatically ejecting the solder column 409 and ensuring the quality of welding.

[0050] Please refer to Figure 4A driving component 600 is provided inside the L-shaped mounting plate 401 for driving the rotating disk 200 to rotate to realize PCB board switching during the lifting and resetting process of the electric soldering iron 408. The driving component 600 includes a second rectangular groove opened on the inner wall of the L-shaped mounting plate 401, and the bottom end of the first threaded column 4010 extends to the inside of the second rectangular groove and is provided with a vertical rod 601 rotatably connected to the bottom wall of the second rectangular groove, and a ratchet mechanism 602 is provided at the bottom end of the first threaded column 4010 and the top end of the vertical rod 601.

[0051] Specifically, when the first motor 405 drives the first threaded column 4010 to rotate and drive the soldering iron 408 and the solder column 409 to move downward, the vertical rod 601 can be driven to rotate through the ratchet mechanism 602. When the first motor 405 reverses and drives the first threaded column 4010 to rotate in the opposite direction, the vertical rod 601 will not be driven to rotate due to the action of the ratchet mechanism 602.

[0052] Please refer to Figure 4 A connecting plate is fixedly provided on the inner bottom wall of the L-shaped mounting plate 401, and a cross bar 603 penetrating the connecting plate is rotatably provided on the surface of the connecting plate. A rotating column 604 rotatably connected to the upper surface of the base 100 is fixedly provided on the lower surface of the rotating disk 200, and a first bevel gear 605 meshing with each other is fixedly provided on one end of the cross bar 603 and the surface of the vertical bar 601, a second bevel gear 606 is fixedly provided on the other end of the cross bar 603, and a bevel gear ring 607 meshing with the second bevel gear 606 is fixedly provided on the surface of the rotating column 604.

[0053] Specifically, the rotation of the vertical rod 601 can drive the horizontal rod 603 to rotate, and the rotation of the horizontal rod 603 can also drive the rotating column 604 to rotate automatically.

[0054] Among them, the present invention sets a driving component 600. In the process of driving the electric soldering iron 408 and the solder column 409 to rise and reset by reversing the first motor 405, the rotation of the first threaded column 4010 can drive the vertical rod 601 to rotate under the action of the ratchet mechanism 602. The rotation of the vertical rod 601 drives the horizontal rod 603 to rotate under the action of the two first bevel gears 605. The rotation of the horizontal rod 603 drives the rotating column 604 to rotate under the action of the second bevel gear 606 and the bevel gear ring 607. The rotation of the rotating column 604 drives the rotating disk 200 to rotate, thereby achieving the purpose of automatically switching the PCB board after welding, and further improving the welding efficiency.

[0055] Working principle: When the welding device is welding the PCB board, the PCB board can be placed in the placement groove 300, and then the first motor 405 is started to drive the first threaded column 4010 to rotate, and the rotation of the first threaded column 4010 drives the first slider 4011 to move downward, and the downward movement of the first slider 4011 drives the electric soldering iron 408 and the solder column 409 to automatically move downward to the surface of the PCB board to achieve automatic welding. When welding is required at other positions on the PCB board, the second motor 406 or the third motor 407 can be started before the first motor 405 is started, and the rotation of the second motor 406 drives the second threaded column 4012 to rotate, and the rotation of the second threaded column 4012 drives the second slider 4013 to move downward. The movement of the second slider 4013 drives the electric soldering iron 408 and the solder column 409 to move longitudinally. At the same time, the rotation of the third motor 407 drives the third threaded column 4014 to rotate. The rotation of the third threaded column 4014 drives the mounting block 404 to move horizontally, thereby driving the electric soldering iron 408 and the solder column 409 to move horizontally, thereby adjusting the positions of the electric soldering iron 408 and the solder column 409, and then being able to automatically solder different positions on the PCB board, effectively improving the welding efficiency. In addition, in the process of soldering the PCB board with the electric soldering iron 408 and the solder column 409, after each welding, the end of the solder column 409 will be shortened due to the melting of the solder column 409. At this time, when soldering the next position of the PCB board When soldering, the first motor 405 can be started to rotate in reverse to drive the electric soldering iron 408 and the solder column 409 to lift and reset, and then the first motor 405 can be started to rotate forward to drive the electric soldering iron 408 and the solder column 409 to move downward to the next soldering position. The first slider 4011 moves downward to drive the first bar frame 402 to move downward. After the first bar frame 402 moves downward to the specified position, it can drive the pressing plate 508 to press the small push-type air pump 507, so that the gas in the small push-type air pump 507 can be filled into the positioning cylinder 501 through the inflation tube 5010, thereby driving the sealing piston 502 in the positioning cylinder 501 to move. The movement of the sealing piston 502 drives the solder column 409 to automatically move out of the positioning cylinder 501. 501 extends out from the inside, thereby achieving the purpose of automatic ejection of the solder column 409, ensuring the quality of welding, and in the process of driving the electric soldering iron 408 and the solder column 409 to rise and reset by reversing the first motor 405, the rotation of the first threaded column 4010 can drive the vertical rod 601 to rotate under the action of the ratchet mechanism 602, and the rotation of the vertical rod 601 drives the cross bar 603 to rotate under the action of the two first bevel gears 605, and the rotation of the cross bar 603 drives the rotating column 604 to rotate under the action of the second bevel gear 606 and the bevel gear ring 607, and the rotation of the rotating column 604 drives the rotating disk 200 to rotate, thereby achieving the purpose of automatically switching the PCB boards after welding, and further improving the welding efficiency.

[0056] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A PCB board welding device, characterized in that: include: A base (100), wherein a rotating disk (200) is rotatably provided on the upper surface of the base (100), and a plurality of placement grooves (300) for placing PCB boards are provided in a circular array on the upper surface of the rotating disk (200); A welding assembly (400) is used to weld a PCB board placed in a placement groove (300), the welding assembly (400) comprising an L-shaped mounting plate (401) fixedly mounted on the outer surface of a base (100), and a first strip frame (402) slidably mounted on the side of the L-shaped mounting plate (401), a second strip frame (403) being slidably mounted on the surface of the first strip frame (402), a mounting block (404) being slidably mounted on the lower surface of the second strip frame (403), and the L-shaped mounting plate (401) having a plurality of strip frames (401) and a plurality of strip frames (402) being slidably mounted on the lower surface of the second strip frame (403). A first motor (405) for driving the first bar frame (402) to rise and fall is fixedly arranged on the top, a second motor (406) for driving the second bar frame (403) to slide is fixedly arranged on the surface of the first bar frame (402), a third motor (407) for driving the mounting block (404) to move is fixedly arranged on the surface of the second bar frame (403), and the welding assembly (400) further comprises an electric soldering iron (408) fixedly arranged on the bottom end of the mounting block (404), and a soldering column (409) arranged on the side of the mounting block (404); The ejection assembly (500) is used to drive the solder column (409) to be automatically ejected when the electric soldering iron (408) is brought close to the PCB board.

2. A PCB board welding device according to claim 1, characterized in that: The inner wall of the L-shaped mounting plate (401) is provided with a first rectangular groove, and the output end of the first motor (405) extends into the interior of the first rectangular groove and is fixedly provided with a first threaded column (4010), the inner wall of the first rectangular groove is slidably provided with a first slider (4011), and the surface of the first slider (4011) is provided with a first threaded hole threadably connected to the outer surface of the first threaded column (4010), and the end of the first slider (4011) is fixedly connected to the surface of the first bar frame (402).

3. A PCB board welding device according to claim 1, characterized in that: The output end of the second motor (406) extends to the interior of the first bar frame (402) and is fixedly provided with a second threaded column (4012); a second slider (4013) is slidably provided on the inner wall of the first bar frame (402); a threaded hole threadedly connected to the outer surface of the second threaded column (4012) is provided on the surface of the second slider (4013); and an end of the second slider (4013) is fixedly connected to an end of the second bar frame (403).

4. A PCB board welding device according to claim 1, characterized in that: The output end of the third motor (407) extends to the interior of the second bar frame (403) and is fixedly provided with a third threaded column (4014), and the outer surface of the top end of the mounting block (404) is slidably connected to the inner wall of the second bar frame (403), and the side surface of the mounting block (404) is provided with a third threaded hole threadedly connected to the outer surface of the third threaded column (4014).

5. A PCB board welding device according to claim 1, characterized in that: The ejection assembly (500) comprises a positioning cylinder (501) fixed to the side of the mounting block (404) via a mounting rod, and a sealing piston (502) slidably arranged on the inner wall of the positioning cylinder (501); a plug-in groove (503) is provided on the surface of the sealing piston (502), and the end of the solder column (409) is plugged into the inside of the plug-in groove (503).

6. A PCB board welding device according to claim 5, characterized in that: The bottom end of the positioning cylinder (501) is fixedly provided with four connecting columns in a circular array, and the bottom ends of the four connecting columns are fixedly provided with a limiting ring (504), and the inner wall of the limiting ring (504) is fixedly provided with four spring sheets (505) in a circular array for limiting the solder column (409).

7. A PCB board welding device according to claim 5, characterized in that: The ejection assembly (500) further comprises a fixing plate (506) fixedly mounted on a side of the L-shaped mounting plate (401), and a small push-type air pump (507) fixedly mounted on an upper surface of the fixing plate (506), and a pressing plate (508) for pressing the small push-type air pump (507) is fixedly mounted on a lower surface of the first strip frame (402).

8. A PCB board welding device according to claim 7, characterized in that: A return spring is arranged inside the small push-type air pump (507), and an air intake pipe (509) and an air charging pipe (5010) extending to the lower surface of the fixing plate (506) are arranged at the ends of the small push-type air pump (507), and an air intake one-way valve (5011) and an air charging one-way valve (5012) are arranged on the surfaces of the air intake pipe (509) and the air charging pipe (5010), respectively, and a hose (5013) extending to the inside of the positioning tube (501) is fixedly arranged at the other end of the air charging pipe (5010).

9. A PCB board welding device according to claim 2, characterized in that: The L-shaped mounting plate (401) is provided with a driving assembly (600) for driving the rotating disk (200) to rotate to achieve PCB board switching during the process of lifting and resetting the electric soldering iron (408), the driving assembly (600) comprising a second rectangular groove provided on the inner wall of the L-shaped mounting plate (401), the bottom end of the first threaded column (4010) extending into the inside of the second rectangular groove and provided with a vertical rod (601) rotatably connected to the bottom wall of the second rectangular groove, and a ratchet mechanism (602) is provided at the bottom end of the first threaded column (4010) and the top end of the vertical rod (601).

10. A PCB board welding device according to claim 9, characterized in that: A connecting plate is fixedly provided on the inner bottom wall of the L-shaped mounting plate (401), and a cross bar (603) penetrating the connecting plate is rotatably provided on the surface of the connecting plate; a rotating column (604) is fixedly provided on the lower surface of the rotating disk (200) and is rotatably connected to the upper surface of the base (100); one end of the cross bar (603) and the surface of the vertical bar (601) are both fixedly provided with a first bevel gear (605) meshing with each other; the other end of the cross bar (603) is fixedly provided with a second bevel gear (606), and a bevel gear ring (607) meshing with the second bevel gear (606) is fixedly provided on the surface of the rotating column (604).

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