Automatic welding device for circuit board

Abstract

The invention discloses an automatic circuit board welding device which comprises an equipment body, a base, a welding machine located above the base and capable of transversely moving and a welding rod located on the welding machine are arranged on the equipment body, a lifting rod is arranged at the bottom of the welding machine, and the action end of the lifting rod is connected with a vertical rod through a circumferential shaking device. One side of the vertical rod is rotatably connected with a swing rod, one side of the swing rod is provided with a welding rod, the welding rod is rotatably and slidably connected with the vertical rod, and the vertical rod is provided with a first control combination used for controlling the swing rod to swing. According to the device, the circumference shaker is arranged between the lifting rod and the vertical rod, when the welding spot coverage area needs to be increased, the welding rod can be controlled to conduct small-radius circle drawing action in situ by starting the circumference shaker, and at the moment, a welding head at the bottom of the welding rod can guide a solution to increase the welding spot area; according to the arrangement, the welding spot can be expanded without frequently controlling the movement of the welding machine, so that the welding spot expanding device has the advantage of higher welding spot expanding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board soldering equipment, and in particular to an automatic circuit board soldering device. Background Art

[0002] Circuit boards are composed of integrated circuits, quartz resonators, fine-tuning capacitors and printed circuit boards. Circuit boards are mainly used to connect various electronic components in electronic equipment and play the role of structural supports. Circuit boards are the most active industry in the contemporary electronic component industry. Circuit boards use miniaturized and intuitive circuits, which play an important role in the mass production of fixed circuits and the optimization of electrical appliance layout. Welding devices are used in the production process of circuit boards for small household appliances. Soldering technology uses tin-based tin alloy materials as solder, and the solder melts and welds at a certain temperature.

[0003] In actual use, the circuit board is usually fixed on the welding table and welded by a handheld welding gun. In the process of manual welding, it is easy to cause inaccurate welding position and welding offset, which reduces the quality of welding. At present, some automatic welding equipment has appeared on the market. The welding rod set in this type of equipment has the function of horizontal and vertical movement, and then a positioning base is set to drive the jig for placing the circuit board and the wire to move back and forth, so that the circuit board can be welded at various positions. However, this type of welding equipment still has shortcomings when used: 1. The welding head cannot move in a circle quickly in place, and thus cannot quickly increase the solder joint area. For some situations where the solder joint area needs to be increased, it is usually necessary to frequently control the displacement of the welding rod to achieve it, so there is a deficiency of low welding efficiency; 2. The welding head is easy to adhere to the solder liquid during welding, which leads to the problem of dripping when the welding rod moves. At the same time, the solder joints after welding are irregular, which greatly reduces the connection strength after welding.

[0004] To this end, the present invention provides an automatic circuit board welding device. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic circuit board welding device in order to solve the problems mentioned in the background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A circuit board automatic welding device includes an equipment body, the equipment body is provided with a base, a welding machine located above the base and capable of moving laterally, and a welding rod located on the welding machine, a lifting rod is provided at the bottom of the welding machine, the action end of the lifting rod is connected to a vertical rod through a circular dither, one side of the vertical rod is rotatably connected to a swing rod, one side of the swing rod is provided with a welding rod, the welding rod and the vertical rod are rotatably and slidably connected, a control combination 1 for controlling the swing of the swing rod is provided on the vertical rod, and a control combination 2 is provided on the vertical rod, the control combination 2 has the function of controlling the synchronous sliding and rotation of the welding rod as well as the independent rotation.

[0008] As a further description of the above technical solution:

[0009] The circular jitter includes a connecting plate, a guide telescopic rod, a driving shaft and a control motor. A sliding sleeve is provided at the bottom of the connecting plate. The outer peripheral wall of the sliding sleeve is fixedly connected to one side of the guide telescopic rod and the vertical rod. The driving shaft is rotatably connected to the middle part of the connecting plate. One end of the driving shaft is fixedly connected to an eccentric shaft rotatably connected to the top of the vertical rod. The control motor is fixedly arranged on the top of the connecting plate and its output shaft is fixedly connected to the driving shaft. The top of the connecting plate is fixedly connected to the bottom of the lifting rod through a connecting seat.

[0010] As a further description of the above technical solution:

[0011] Two ear plates respectively close to both sides are welded at the bottom of the connecting plate, a guide shaft sleeved on the outside of the sliding sleeve is fixedly connected between the two ear plates, and a positioning hole rotatably connected to the eccentric shaft is opened at the top of the vertical rod.

[0012] As a further description of the above technical solution:

[0013] The bottom end of the swing arm is fixedly connected to a positioning tube which is rotatably connected to the bottom end of the vertical rod. The control assembly includes a driving motor and a transmission gear. The top of the swing arm is fixedly connected to an arc plate. The driving motor is fixedly arranged on one side of the vertical rod and its output shaft is fixedly connected to the transmission gear. The transmission gear is meshed with the outer arc wall of the arc plate.

[0014] As a further description of the above technical solution:

[0015] The other side of the swing rod is fixedly connected with a guide block, and the guide block is provided with a rotating sleeve sleeved on the outside of the welding rod, and the rotating sleeve and the welding rod are slidably connected.

[0016] As a further description of the above technical solution:

[0017] The control combination 2 includes a screw, a first transmission shaft, a second transmission shaft, a third transmission shaft and a servo motor 1. One end of the positioning tube is fixedly connected to a square frame with a gap sleeved on the outside of the welding rod. The first transmission shaft and the second transmission shaft are respectively rotatably connected to the opposite sides of the square frame. The first transmission shaft and the positioning tube are coaxially arranged. The third transmission shaft is rotatably connected to one side of the square frame and one end of it is connected to the first transmission shaft and the second transmission shaft through a bevel gear set 1. The screw is rotatably connected to one side of the guide block and one end of it is connected to the second transmission shaft through a bevel gear set 2. A cantilever close to the top is rotatably connected to the welding rod, and the cantilever is screwed together with the screw. The servo motor 1 is fixedly arranged on one side of the vertical rod and its output shaft is fixedly connected to the first transmission shaft.

[0018] As a further description of the above technical solution:

[0019] The control combination 2 includes servo motor 2 and a transmission bevel gear disk, an arm rod is welded to the outer peripheral wall of the rotating sleeve, a suspension rod is fixedly connected to the outer side of the guide block, a ratchet shaft is arranged in the middle of the transmission bevel gear disk, the servo motor 2 is fixedly arranged on the top of the suspension rod and its output shaft is fixedly connected to the ratchet shaft, an eccentric shifting shaft which rotates and slides with the arm rod is fixedly connected to the back side of the transmission bevel gear disk, and the other end of the third transmission shaft is fixedly connected to an intermediate bevel gear disk which meshes with the transmission bevel gear disk.

[0020] As a further description of the above technical solution:

[0021] The top of the base is slidably connected to a portal frame, the top of the connecting plate is welded with a limiting sleeve mounted on the top crossbeam of the portal frame, the limiting sleeve is slidably connected to the crossbeam, and both sides of the portal frame are fixedly connected to a clamp mounting seat.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. In the present invention, a circular dither is arranged between the lifting rod and the vertical rod. When the coverage area of ​​the weld spot needs to be increased, the circular dither can be started to control the welding rod to draw a small radius circle in situ. At this time, the welding head at the bottom of the welding rod will guide the molten liquid to increase the area of ​​the weld spot. This arrangement can realize the expansion of the weld spot without frequently controlling the movement of the welding machine, thereby having the advantage of higher efficiency in the expansion of the weld spot.

[0024] 2. In the present invention, the welding rod is connected by rotating and sliding on one side of the vertical rod. When the welding rod rotates back and forth, the welding head on it will be separated from the welding liquid faster to avoid the problem of dripping. At the same time, the welding liquid will become more rounded under the rotation of the welding head, so that the appearance of the welding spot after welding is more rounded and the quality after welding is higher.

[0025] 3. In the present invention, the connecting plate on the circular dither is slidably connected to the portal frame, and the bottom of the portal frame and the base slide up and down in coordination. When the lifting rod is actuated, the connecting plate will drive the portal frame to move up and down, and then a mounting seat for connecting the pressing tool is arranged on the inner side of the portal frame, so that the device can press and release the circuit boards and wires on the fixture more quickly and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of an automatic circuit board welding device proposed by the present invention;

[0027] Figure 2 This is a schematic structural diagram of the coordination of a circular ditherer, a vertical rod, a swing rod, a control assembly 1 and a control assembly 2 of an automatic circuit board welding device proposed by the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram at the bottom;

[0029] Figure 4 A plan view showing the connection between a driving shaft, a connecting plate and a vertical rod of an automatic circuit board welding device proposed by the present invention;

[0030] Figure 5 for Figure 4 Bottom view of

[0031] Figure 6 The present invention is a schematic diagram of the connection between a connecting plate and a door frame of an automatic circuit board welding device proposed by the present invention.

[0032] Legend:

[0033] 1. Base; 2. Welding machine; 3. Welding rod; 31. Cantilever; 4. Lifting rod; 5. Circular shaker; 51. Connecting plate; 511. Sliding sleeve; 512. Connecting seat; 513. Ear plate; 5131. Guide shaft; 514. Limit sleeve; 52. Guide telescopic rod; 53. Drive shaft; 531. Eccentric shaft; 54. Control motor; 6. Vertical rod; 61. Positioning hole; 7. Rocker; 71. Positioning tube; 711. Frame; 72. Arc plate; 73. Guide block; 731. Rotating sleeve; 7311, arm; 732, suspension rod; 8, control combination one; 81, drive motor; 82, transmission gear; 9, control combination two; 91, screw rod; 92, first transmission shaft; 93, second transmission shaft; 94, third transmission shaft; 941, intermediate bevel gear plate; 95, servo motor one; 96, servo motor two; 97, transmission bevel gear plate; 971, ratchet shaft; 972, eccentric shift shaft; 101, door frame; 1011, crossbeam; 1012, mounting seat. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-5 A circuit board automatic welding device includes a device body, which is used for soldering connections between circuit boards and wires. The device body is provided with a base 1, a welding machine 2 located above the base 1 and capable of moving laterally, and a welding rod 3 located on the welding machine 2. A welding head is provided at the bottom of the welding rod 3. After the welding head is heated, a wire feeder (not shown in the figure) feeds tin wire to the welding head position, the tin wire melts, and then the welding is completed.

[0037] In the present technical solution, a lifting rod 4 is provided at the bottom of the welding machine 2. The lifting rod 4 is an electric telescopic rod. The action end of the lifting rod 4 is connected to the vertical rod 6 through a circular dither 5. One side of the vertical rod 6 is rotatably connected to a swing rod 7. A welding rod 3 is provided on one side of the swing rod 7. When the circular dither 5 is started, it will drive the welding rod 3 to draw a circle with a small radius. The purpose is to increase the welding surface in situ and improve the welding efficiency.

[0038] Specifically, the circular ditherer 5 includes a connecting plate 51, a guide telescopic rod 52, a driving shaft 53 and a control motor 54. A sliding sleeve 511 is provided at the bottom of the connecting plate 51. In a specific implementation, it is preferred that two ear plates 513 respectively close to both sides are welded to the bottom of the connecting plate 51, and a guide shaft 5131 sleeved on the outside of the sliding sleeve 511 is fixedly connected between the two ear plates 513. The outer peripheral wall of the sliding sleeve 511 is fixedly connected to one side of the vertical rod 6 through the guiding telescopic rod 52. The guiding telescopic rod 52 is a common two-section telescopic structure. The guiding telescopic rod 52 is perpendicular to the sliding sleeve 511. The driving shaft 53 is rotatably connected to the middle part of the connecting plate 51. One end of the driving shaft 53 is fixedly connected to an eccentric shaft 531 rotatably connected to the top of the vertical rod 6. In the specific implementation, it is preferred that a positioning hole 61 rotatably connected to the eccentric shaft 531 is opened at the top of the vertical rod 6, and a bearing can be arranged between the positioning hole 61 and the eccentric shaft 531. When the driving shaft 53 rotates, the eccentric shaft 531 will drive the vertical rod 6 to draw a circle. At this time, the sliding sleeve 51 will slide adaptively, and the guiding telescopic rod 52 will extend and retract adaptively, thereby realizing a small radius circle drawing action of the welding head at the bottom of the welding rod 3. The control motor 54 is fixedly arranged on the top of the connecting plate 51 and its output shaft is fixedly connected to the driving shaft 53. The control motor 54 provides driving force for the rotation of the driving shaft 53. The top of the connecting plate 51 is fixedly connected to the bottom of the lifting rod 4 through the connecting seat 512. The connecting seat 512 is a door-type seat structure. When the lifting rod 4 is in motion, it can control the height of the vertical rod 6.

[0039] Furthermore, the welding rod 3 and the vertical rod 6 are rotatably and slidably connected. In the present embodiment, the rotation plane of the welding rod 3 is parallel to the vertical rod 6. The vertical rod 6 is provided with a control assembly 8 for controlling the swing of the swing rod 7. When the swing rod 7 swings, the welding rod 3 thereon will follow and swing back and forth, so that the welding rod 3 can be in a vertical state and an inclined state. When in an inclined state, the inclination angle will also be different. This arrangement cooperates with the lateral sliding function of the welding 2, which is convenient for welding different positions of the circuit board on the positioning fixture.

[0040] Specifically, the bottom end of the rocker arm 7 is fixedly connected to a positioning tube 71 which is rotatably connected to the bottom end of the vertical rod 6. The control assembly 8 includes a driving motor 81 and a transmission gear 82. The top of the rocker arm 7 is fixedly connected to an arc plate 72. The driving motor 81 is fixedly arranged on one side of the vertical rod 6 and its output shaft is fixedly connected to the transmission gear 82. The transmission gear 82 is meshed with the outer arc wall of the arc plate 72. When the transmission gear 82 rotates, it can drive the arc plate 72 to move, thereby driving the rocker arm 7 to swing.

[0041] Furthermore, a guide block 73 is fixedly connected to the other side of the rocker arm 7, and a rotating sleeve 731 is provided on the guide block 73 and is sleeved on the outside of the welding rod 3. The rotating sleeve 731 and the welding rod 3 are slidably connected. This arrangement enables the welding rod 3 and the rocker arm 7 to realize rotation and sliding functions. When the welding rod 3 rotates, it can drive the welding head to rotate. When the welding head rotates, the tin around it can easily and quickly detach from the welding head. At the same time, it can make the welding point more round and uniform, which has the advantage of improving the welding quality.

[0042] A second control assembly 9 is provided on the vertical rod 6, and the second control assembly 9 has the function of controlling the welding rod 3 to slide and rotate synchronously as well as to rotate independently.

[0043] Specifically, the control combination 2 9 includes a screw 91, a first transmission shaft 92, a second transmission shaft 93, a third transmission shaft 94 and a servo motor 1 95. One end of the positioning tube 71 is fixedly connected to a frame 711 that is sleeved on the outside of the welding rod 3. The first transmission shaft 92 and the second transmission shaft 93 are rotatably connected to the opposite sides of the frame 711 respectively. The first transmission shaft 92 and the positioning tube 71 are coaxially arranged. The third transmission shaft 94 is rotatably connected to one side of the frame 711 and one end thereof is connected to the first transmission shaft 92 and the second transmission shaft 93 through a bevel gear set 1. The bevel gear set 1 includes three transition bevel gears of the same or different sizes (as shown in the figure). This arrangement allows the first transmission shaft 92 to be able to rotate temporarily when it rotates. The second transmission shaft 93 is driven to rotate. The screw rod 91 is rotatably connected to one side of the guide block 73, and one end of the screw rod 91 is connected to the second transmission shaft 93 through a bevel gear set 2. The bevel gear set 2 includes two identical or different connected bevel gears (as shown in the figure). When the second transmission shaft 93 rotates, it can indirectly drive the screw rod 91 to rotate. A cantilever 31 close to the top is rotatably connected to the welding rod 3. The cantilever 31 and the screw rod 91 are screwed together. When the screw rod 91 rotates, the screw rod 3 can be driven axially by the screwing action to realize the slow feed control of the welding rod 3. The servo motor 95 is fixedly arranged on one side of the vertical rod 6 and its output shaft is fixedly connected to the first transmission shaft 92. The servo motor 95 provides driving force for the rotation of the first transmission shaft 92.

[0044] Furthermore, the control combination 29 includes a servo motor 296 and a transmission bevel gear disk 97. An arm 7311 is welded to the outer peripheral wall of the rotating sleeve 731. A suspension rod 732 is fixedly connected to the outer side of the guide block 73. A ratchet shaft 971 is provided in the middle of the transmission bevel gear disk 97. The function of the ratchet shaft 971 is that it will not drive the transmission bevel gear disk 97 to rotate when it rotates forward, but will drive the transmission bevel gear disk 97 to rotate when it rotates backward. The servo motor 96 is fixedly arranged on the top of the suspension rod 732 and its output shaft is fixedly connected to the ratchet shaft 971. The back side of the transmission bevel gear disk 97 is fixedly connected to an eccentric shift shaft 972 which rotates and slides with the arm 7311. In specific implementation, a waist-shaped hole adapted to the eccentric shift shaft 972 can be opened on the arm 7311. When the servo motor 96 drives the transmission bevel gear disk 97 to rotate, the eccentric shift shaft 972 drives the arm 7311 to swing back and forth, thereby driving the rotating sleeve 731 to rotate back and forth. The other end of the third transmission shaft 94 is fixedly connected to an intermediate bevel gear disk 941 which meshes with the transmission bevel gear disk 97. Therefore, when the welding rod 3 moves axially, it will also drive the rotating sleeve 731 to rotate back and forth. This situation is suitable for the situation where the welding rod 3 is away from the circuit board after welding. There is no need to start the servo motor 96. The purpose is to accelerate the detachment of the tin melt at the welding head to avoid the problem of dripping.

[0045] Example 2

[0046] See also Figure 1 and Figure 6 , and the difference from Example 1 is that the top of the base 1 is slidably connected to the door frame 101 up and down. During the specific implementation, the support rod can be slidably connected to the bottom of the door frame 101, and the bottom of the support rod is fixedly connected to the base 1. A positioning platform fixedly connected to the base 1 is installed below the door frame 101, and a socket for plugging and matching with the fixture is provided on the positioning platform. When in use, the fixture carrying the circuit board and the welding wire is placed on the positioning platform, and a limiting sleeve 514 is welded on the top of the connecting plate 51 and is sleeved on the top crossbeam 1011 of the door frame 101. The limiting sleeve 514 is slidably connected to the crossbeam 1011. When the connecting plate 51 moves downward, it will drive the door frame 101 to move downward. Both sides of the door frame 101 are fixedly connected with a fixture mounting seat 1012. The function of the fixture mounting seat 1012 is to install a press adapted for circuit board welding. This arrangement makes the clamping and positioning control of the circuit board and the wire to be welded on the fixture faster and more convenient, wherein the setting of the limiting sleeve 514 does not affect the lateral movement of the welding machine 2.

[0047] Working principle: When in use, place the jig for placing the circuit board and the wire to be welded on the positioning table on the base 1, then control the lifting rod 4 to push, the connecting plate 51 drives the door frame 101 to move downward, and the press connected to the inner side of the door frame 101 through the mounting seat 1012 will press the circuit board and the wire on the jig, and then control the welding machine 2 to slide horizontally, and then start the drive motor 81 to drive the transmission gear 82 to rotate, thereby driving the swing rod 7 to swing until the welding head of the welding rod 3 faces the welding part, start the servo motor 95, the first transmission shaft 92 is driven to rotate, and the second transmission shaft 93 drives the screw rod 91 to rotate. At this time, the welding rod 3 will move axially and drive the welding head close to the welding part, control the welding rod 3 to heat, and then control the external wire feeder to deliver tin wire to the welding head, the tin wire is melted, and then the welding is completed. When the welding spot area needs to be increased, the control motor 54 is started, and the driving shaft 53 will drive the eccentric shaft 531 to rotate, thereby driving the vertical rod 6 to draw a circle with a small radius. At this time, the welding head will also draw a circle with a small radius, thereby increasing the welding spot area. When the welding liquid adheres to the welding head, the servo motor 2 96 is started at this time. Under the transmission of the eccentric shift shaft 972, the rotating sleeve 731 drives the welding rod 3 to rotate back and forth, so that the welding head and the molten liquid are separated faster, and at the same time, the welding liquid at the welding spot can be driven to be more rounded, and the welding spot will be more rounded after solidification, thereby improving the firmness of the connection after welding.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic circuit board welding device, comprising a device body, the device body is provided with a base (1), a welding machine (2) located above the base (1) and capable of moving laterally, and a welding rod (3) located on the welding machine (2), a lifting rod (4) is provided at the bottom of the welding machine (2), characterized in that: The action end of the lifting rod (4) is connected to a vertical rod (6) through a circular shaker (5); one side of the vertical rod (6) is rotatably connected to a swing rod (7); a welding rod (3) is arranged on one side of the swing rod (7); the welding rod (3) and the vertical rod (6) are rotatably and slidably connected; a control assembly 1 (8) for controlling the swing of the swing rod (7) is arranged on the vertical rod (6); a control assembly 2 (9) is arranged on the vertical rod (6); the control assembly 2 (9) has the function of controlling the synchronous sliding and rotation of the welding rod (3) as well as the independent rotation.

2. The automatic circuit board soldering device according to claim 1, characterized in that: The circular ditherer (5) includes a connecting plate (51), a guide telescopic rod (52), a driving shaft (53) and a control motor (54). A sliding sleeve (511) is provided at the bottom of the connecting plate (51). The outer peripheral wall of the sliding sleeve (511) is fixedly connected to one side of the vertical rod (6) through the guide telescopic rod (52). The driving shaft (53) is rotatably connected to the middle part of the connecting plate (51). One end of the driving shaft (53) is fixedly connected to an eccentric shaft (531) rotatably connected to the top of the vertical rod (6). The control motor (54) is fixedly arranged on the top of the connecting plate (51) and its output shaft is fixedly connected to the driving shaft (53). The top of the connecting plate (51) is fixedly connected to the bottom of the lifting rod (4) through a connecting seat (512).

3. The automatic circuit board soldering device according to claim 2, characterized in that: Two ear plates (513) are welded to the bottom of the connecting plate (51) and are close to both sides respectively. A guide shaft (5131) sleeved on the outside of the sliding sleeve (511) is fixedly connected between the two ear plates (513). A positioning hole (61) rotatably connected to the eccentric shaft (531) is opened at the top of the vertical rod (6).

4. The automatic circuit board soldering device according to claim 1, characterized in that: The bottom end of the swing rod (7) is fixedly connected to a positioning tube (71) rotatably connected to the bottom end of the vertical rod (6); the control assembly (8) comprises a driving motor (81) and a transmission gear (82); the top of the swing rod (7) is fixedly connected to an arc plate (72); the driving motor (81) is fixedly arranged on one side of the vertical rod (6) and its output shaft is fixedly connected to the transmission gear (82); the transmission gear (82) is meshed with an outer arc wall of the arc plate (72).

5. The automatic circuit board soldering device according to claim 4, characterized in that: A guide block (73) is fixedly connected to the other side of the swing rod (7), and a rotating sleeve (731) sleeved on the outside of the welding rod (3) is provided on the guide block (73), and the rotating sleeve (731) and the welding rod (3) are slidably connected.

6. The automatic circuit board soldering device according to claim 5, characterized in that: The control assembly (9) comprises a screw (91), a first transmission shaft (92), a second transmission shaft (93), a third transmission shaft (94) and a servo motor (95); one end of the positioning tube (71) is fixedly connected to a square frame (711) which is sleeved on the outside of the welding rod (3); the first transmission shaft (92) and the second transmission shaft (93) are rotatably connected to opposite sides of the square frame (711); the first transmission shaft (92) and the positioning tube (71) are coaxially arranged; the third transmission shaft (94) is rotatably connected to the positioning tube (71). One side of the frame (711) and one end of which is connected to the first transmission shaft (92) and the second transmission shaft (93) through a bevel gear set 1; the screw rod (91) is rotatably connected to one side of the guide block (73) and one end of which is connected to the second transmission shaft (93) through a bevel gear set 2; a cantilever (31) close to the top is rotatably connected to the welding rod (3); the cantilever (31) and the screw rod (91) are screwed together; the servo motor 1 (95) is fixedly arranged on one side of the vertical rod (6) and its output shaft is fixedly connected to the first transmission shaft (92).

7. The automatic circuit board soldering device according to claim 6, characterized in that: The control assembly 2 (9) comprises a servo motor 2 (96) and a transmission bevel gear disc (97); an arm (7311) is welded to the outer peripheral wall of the rotating sleeve (731); a suspension rod (732) is fixedly connected to the outer side of the guide block (73); a ratchet shaft (971) is arranged in the middle of the transmission bevel gear disc (97); the servo motor 2 (96) is fixedly arranged on the top of the suspension rod (732) and its output shaft is fixedly connected to the ratchet shaft (971); an eccentric shifting shaft (972) which is rotatably and slidably matched with the arm (7311) is fixedly connected to the back side of the transmission bevel gear disc (97); and the other end of the third transmission shaft (94) is fixedly connected to an intermediate bevel gear disc (941) which meshes with the transmission bevel gear disc (97).

8. The automatic circuit board soldering device according to claim 2, characterized in that: The top of the base (1) is slidably connected to a portal frame (101) in an up-and-down manner, a limiting sleeve (514) is welded to the top of the connecting plate (51) and is sleeved on a top crossbeam (1011) of the portal frame (101), the limiting sleeve (514) and the crossbeam (1011) are slidably connected, and a clamp mounting seat (1012) is fixedly connected to both sides of the portal frame (101).

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