PCB welding device for carrier module

By designing a carrier module with regulating components and cone gears, the PCB board welding device is used to solve the problem of the traditional welding device welding ting that cannot be adjusted according to the PCB board changes.

CN119347028APending Publication Date: 2025-01-24JIANGSU CHANGSHI JIYE ELECTRIC TECH CO LTD
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Patent Information

Application Number
CN202411747137.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-01-24

AI Technical Summary

Technical Problem

During the welding process of traditional welding devices, the welding head cannot change the pressure according to the changes in the PCB board, resulting in unstable welding quality, which may cause safety problems such as welding slag, component damage or splashing, short circuits, etc.

Method used

A carrier module is designed with a PCB plate welding device, including the chassis and mobile components. By adjusting the position and pressure of the welding ting of the welding ting of the module and the gear, the self -locking characteristics of the cone gear are used to maintain the stability of the welding ting.

Benefits of technology

The accurate control of the distance from the welding ting of the welding ting is reduced, and the safety problems such as splashing and short circuit due to improper pressure are reduced, and good contacts are formed between the welds and the PCB board, and the reliability of the welding quality and equipment are improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a PCB welding device for a carrier module, and relates to the technical field of carrier module production equipment.The PCB welding device comprises a case and a moving assembly, the top end of the moving assembly is slidably connected with a mounting shell, and an adjusting assembly is mounted on the inner wall of the mounting shell and comprises a first motor mounted on the inner wall of the mounting shell; a first connecting rod is rotatably connected to the inner wall of the crank, a second connecting rod is rotatably connected to the end, away from the crank, of the first connecting rod, a rotating block is rotatably connected to the bottom end of the second connecting rod, a push rod is fixedly connected to the bottom end of the rotating block, and a welding head is installed at the bottom end of the push rod; the inner wall of the first connecting rod is rotationally connected with a third connecting rod; according to the invention, the welding head is kept at a proper position for welding through the adjusting assembly, so that good contact between the welding flux and the element and between the welding flux and the PCB is ensured.
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Description

Technical Field

[0001] The invention relates to the technical field of carrier module production equipment, in particular to a PCB board welding device for a carrier module. Background Art

[0002] The carrier module refers to a circuit module that can realize wireless signal transmission. It is mainly composed of oscillators, modulators, detectors, amplifiers and other components. In wireless communication, the digital signal, voice or image sent by the device is modulated into a carrier signal and transmitted through the carrier module. After the carrier module at the receiving end receives the transmitted signal, it is demodulated and restored to the original signal. The complete communication link is composed of the carrier module at the transmitting end and the carrier module at the receiving end. The carrier module usually uses high-frequency oscillation, which has a long transmission distance and can pass through a variety of objects. Therefore, it has a wide range of applications in many fields. For example, in smart stadiums, the use of carrier modules can realize wireless automatic scoring, which improves the fairness of the game. In smart homes, carrier modules can realize the control and monitoring of smart lighting, temperature, security and other home appliances.

[0003] In the prior art, carrier modules usually need to be welded to PCB boards and components during production. However, during the welding process, the welding head of the traditional welding device cannot change the pressure according to the changes of the PCB board. If the pressure is too high, the solder may be over-melted, forming welding slag or causing damage to the components; if the pressure is too low, the solder may not be fully melted and a firm connection cannot be formed. This unstable welding quality will directly affect the performance and reliability of the carrier module. If the welding head is loaded with a telescopic rod, the operator needs to manually control the extension distance of the telescopic rod. If the operator makes a control error during mass production, the telescopic rod may cause the welding head to extend excessively, causing damage to the PCB board and components, and at the same time causing safety problems such as spatter and short circuit. Summary of the invention

[0004] The object of the present invention is to provide a PCB board welding device for a carrier module to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention provides a PCB board welding device for a carrier module, comprising a chassis and a moving component, the top of the moving component is slidably connected to a mounting shell, the inner wall of the mounting shell is installed with an adjusting component, the adjusting component comprises a first motor installed on the inner wall of the mounting shell, one end of the first motor is rotatably connected to a crank, the inner wall of the crank is rotatably connected to a first connecting rod, the end of the first connecting rod away from the crank is rotatably connected to a second connecting rod, the bottom end of the second connecting rod is rotatably connected to a rotating block, the bottom end of the rotating block is fixedly connected to a push rod, a welding head is installed at the bottom end of the push rod, the inner wall of the first connecting rod is also rotatably connected to a third connecting rod, the end of the third connecting rod away from the first connecting rod is connected to a fourth connecting rod, one end of the fourth connecting rod is installed with a first sliding block, the inner wall of the first sliding block is rotatably connected to a screw rod, the bottom end of the screw rod is installed with a first bevel gear, one side outer wall of the first bevel gear is meshedly connected to the second bevel gear, a rotating shaft is installed in the middle of the second bevel gear, one end of the rotating shaft is rotatably connected to the second motor, and the outer walls of the rotating shaft and the screw rod are both connected to the first connecting plate.

[0006] Furthermore, a centering clamping assembly is installed inside the chassis, and the centering clamping assembly includes a mounting plate installed on the inner wall of the chassis, an electric telescopic rod is installed at the bottom end of the mounting plate, one end of the electric telescopic rod is slidably connected to a connecting rod, an end of the connecting rod away from the electric telescopic rod is fixedly connected to a second connecting plate, the top outer wall of the second connecting plate is connected to a second sliding block, a side of the top of the mounting plate away from the second sliding block is slidably connected to a third sliding block, an outer wall on one side of the bottom end of the second sliding block is connected to a first rack, an outer wall on one side of the bottom end of the third sliding block is connected to a second rack, a cylindrical gear is installed on the outer wall on the side opposite to the second rack and the first rack, a rotating rod is provided in the middle of the cylindrical gear, and the tops of the second sliding block and the third sliding block are both connected to a clamp.

[0007] Furthermore, vertical sliding bars are installed on both sides of the top of the chassis, and a sliding bar is installed on the outer wall on the side opposite to each vertical sliding bar.

[0008] Furthermore, a control panel is installed on one side outer wall of the chassis, and a plurality of control buttons are installed on the surface of the control panel. The control panel is electrically connected to the adjustment component and the centering clamping component.

[0009] Furthermore, the outer wall of the first motor is fixedly connected to the inner wall of the mounting shell, the end of the crank away from the first motor is rotatably connected to the inner wall of the mounting shell, the outer wall of the push rod is fixedly connected to the inner wall of the mounting shell, and the outer wall of one end of the first sliding block is slidably connected to a guide rail.

[0010] Furthermore, a sliding groove is provided on the inner wall of the installation shell, the inner wall of the sliding groove is slidably connected to the top outer wall of the moving component, and two vacuum adsorption plates are installed on one side of the bottom end of the installation shell.

[0011] Furthermore, a protective pad is installed on one side opposite to the two clamps. The material of the protective pad is an insulating flexible material, and the surface of the protective pad is evenly paved with anti-slip patterns.

[0012] Furthermore, the first rack and the second rack are meshingly connected to the cylindrical gear, the rotating rod is rotatably connected to the cylindrical gear, the end of the rotating rod away from the cylindrical gear is fixedly connected to the top of the mounting plate, and the second sliding block and the third sliding block are provided with a through groove on one side of the bottom end, and the width of each through groove is adapted to the width of the first rack and the second rack.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the adjustment is performed by rotating the bevel gear through the adjustment component, and the self-locking property of the bevel gear enables the adjustment component to maintain the stability of the welding head during the adjustment process, and it is not easy to loosen or slide, which helps to keep the welding head in the appropriate position for welding work, reduces safety problems such as spatter and short circuit caused by improper pressure, can achieve precise control of the extension distance of the welding head, and helps to ensure good contact between the solder and the components and the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front structure of a PCB board welding device for a carrier module; Figure 2 This is a schematic diagram of the overall structure of a PCB board welding device for a carrier module; Figure 3 This is a schematic diagram of the structure of a welding head in a PCB board welding device for a carrier module; Figure 4 It is a schematic diagram of the overall structure of an adjustment component in a PCB board welding device for a carrier module; Figure 5 It is an enlarged schematic diagram of an adjustment component in a PCB board welding device for a carrier module; Figure 6 It is a structural schematic diagram of a centering clamping assembly in a PCB board welding device for a carrier module; Figure 7 The present invention is a schematic diagram of the structure of a second sliding block in a PCB board welding device for a carrier module.

[0015] In the figure: 1. Chassis; 2. Moving assembly; 3. Mounting shell; 4. First motor; 5. Crank; 6. First connecting rod; 7. Second connecting rod; 8. Rotating block; 9. Push rod; 10. Third connecting rod; 11. Fourth connecting rod; 12. First sliding block; 13. Screw; 14. First bevel gear; 15. Second bevel gear; 16. Rotating shaft; 17. Second motor; 18. First connecting plate; 19. Welding head; 20. Mounting plate; 21. Electric telescopic rod; 22. Connecting rod; 23. Second connecting plate; 24. Second sliding block; 25. Third sliding block; 26. First rack; 27. Second rack; 28. Cylindrical gear; 29. ​​Rotating rod; 30. Clamp; 31. Vertical sliding rod; 32. Control panel. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1 - Figure 7 The present invention provides a technical solution for a PCB board welding device for a carrier module: In an embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , including a chassis 1 and a moving component 2, the top of the moving component 2 is slidably connected to a mounting shell 3, the inner wall of the mounting shell 3 is installed with an adjusting component, the adjusting component includes a first motor 4 installed on the inner wall of the mounting shell 3, one end of the first motor 4 is rotatably connected to a crank 5, the inner wall of the crank 5 is rotatably connected to a first connecting rod 6, the end of the first connecting rod 6 away from the crank 5 is rotatably connected to a second connecting rod 7, the bottom end of the second connecting rod 7 is rotatably connected to a rotating block 8, the bottom end of the rotating block 8 is fixedly connected to a push rod 9, the bottom end of the push rod 9 is installed with a welding head 19, the first connecting rod 6 The inner wall is also rotatably connected to a third connecting rod 10, and the end of the third connecting rod 10 away from the first connecting rod 6 is connected to a fourth connecting rod 11, and one end of the fourth connecting rod 11 is installed with a first sliding block 12, and the inner wall of the first sliding block 12 is rotatably connected to a screw rod 13, and a first bevel gear 14 is installed at the bottom end of the screw rod 13, and a second bevel gear 15 is meshed and connected to an outer wall on one side of the first bevel gear 14, and a rotating shaft 16 is installed in the middle of the second bevel gear 15, and one end of the rotating shaft 16 is rotatably connected to a second motor 17, and the outer walls of the rotating shaft 16 and the screw rod 13 are connected to a first connecting plate 18.

[0018] It should be noted that the outer wall of the first motor 4 is fixedly connected to the inner wall of the mounting shell 3, which ensures the stability of the first motor 4 during operation. One end of the first motor 4 is rotatably connected to the crank 5, and when the first motor 4 is started, the crank 5 is synchronously driven to rotate. The first motor 4 serves as a power source, and the rotational power is directly transmitted to the crank 5 through the connection between the first motor 4 and the crank 5, so that the crank 5 rotates around a fixed point with the first motor 4 as the center, and the inner wall of the crank 5 is connected to the first connecting rod 6, and the first connecting rod 6 is driven by the crank 5 to convert the rotational motion into swinging. The first connecting rod 6 is rotatably connected to the second connecting rod 7 at the end away from the crank 5, and a connecting rod structure is formed through the rotational connection between the second connecting rod 7 and the first connecting rod 6, and the bottom end of the second connecting rod 7 is connected to a rotating block 8, and the bottom end of the rotating block 8 is fixedly connected to a push rod 9, and a welding head 19 is installed at the bottom end of the push rod 9. The push rod 9 can be moved on the inner wall of the mounting shell 3 by starting the first motor 4. The third connecting rod 10 is also rotatably connected to the inner wall of the first connecting rod 6, and the fixed connection between the outer wall of the second motor 17 and the inner wall of the mounting shell 3 ensures that the second motor 17 will not be displaced or shaken during operation, thereby enhancing the stability of the second motor 17. When the second motor 17 is started, the rotating shaft 16 is synchronously driven to rotate, and a second bevel gear 15 is connected to one end of the rotating shaft 16. The outer wall of the second bevel gear 15 is meshingly connected to the first bevel gear 14, and the rotational motion of the second motor 17 can be transmitted to the rotational motion of the screw rod 13 through the meshing connection. The first sliding block 12 is controlled by the rotation of the screw rod 13, and when the first sliding block 12 slides in the guide rail, the swing angle of the first connecting rod 6 driven by the third connecting rod 10 can be adjusted to realize the limit and control of the stroke of the welding head 19, and the stable transmission characteristics of the meshing connection are used to reduce error accumulation, thereby improving the positioning accuracy of the welding head 19.

[0019] See also Figure 6 , Figure 7 A centering clamping assembly is installed inside the chassis 1, and the centering clamping assembly includes a mounting plate 20 mounted on the inner wall of the chassis 1, an electric telescopic rod 21 is installed at the bottom end of the mounting plate 20, one end of the electric telescopic rod 21 is slidably connected to a connecting rod 22, an end of the connecting rod 22 away from the electric telescopic rod 21 is fixedly connected to a second connecting plate 23, a second sliding block 24 is connected to the top outer wall of the second connecting plate 23, a third sliding block 25 is slidably connected to the side of the top of the mounting plate 20 away from the second sliding block 24, a first rack 26 is connected to the outer wall of one side of the bottom end of the second sliding block 24, a second rack 27 is connected to the outer wall of one side of the bottom end of the third sliding block 25, a cylindrical gear 28 is installed on the outer wall of the side opposite to the second rack 27 and the first rack 26, a rotating rod 29 is provided in the middle of the cylindrical gear 28, and a clamp 30 is connected to the top of the second sliding block 24 and the third sliding block 25.

[0020] It should be noted that the centering clamping assembly installed inside the chassis 1 is used to fix the PCB board to be soldered. The start of the electric telescopic rod 21 fixedly connected to the bottom end of the mounting plate 20 drives the connecting rod 22 to extend and retract. When the connecting rod 22 is extended and retracted, it drives the second connecting plate 23 to push and pull horizontally. Because the top end of the second connecting plate 23 is fixedly connected to the second sliding block 24, the stability between the second connecting plate 23 and the second sliding block 24 is enhanced. The second sliding block 24 is horizontally moved on the top end of the mounting plate 20 by the movement of the second connecting plate 23. The cylindrical gear 28 can be moved by meshing the first rack 26 installed on one side of the bottom end of the second sliding block 24 with the cylindrical gear 28, and the cylindrical gear 28 can be rotated, and the middle part of the cylindrical gear 28 is rotatably connected to the rotating rod 29, and the bottom end of the rotating rod 29 is fixedly connected to the top of the mounting plate 20, which ensures the stability of the cylindrical gear 28 when transmitting rotational power. When the cylindrical gear 28 rotates, the second rack 27 meshing on one side will move linearly, so that the second sliding block 24 and the third sliding block 25 drive the two clamps 30 to clamp in the center.

[0021] See also Figure 1 , Figure 2 , vertical slide bars 31 are installed on both sides of the top of the chassis 1, and a slide bar is installed on the outer wall on the side opposite to each vertical slide bar 31.

[0022] It should be noted that the moving component 2 can position the installation shell 3 in the horizontal direction to the left and right, and the two vertical slide bars 31 can use the slide bars to position the moving component 2 in the horizontal direction of the installation shell 3 in a straight line. Providing multi-degree-of-freedom positioning can effectively improve the adaptability of the equipment and meet different welding requirements and changes in workpiece size.

[0023] See also Figure 1 , Figure 2 A control panel 32 is installed on one side outer wall of the chassis 1. A plurality of control buttons are installed on the surface of the control panel 32. The control panel 32 is electrically connected to the adjustment component and the centering clamping component.

[0024] It should be noted that the control panel 32 can be used to quickly start and shut down the machine and adjust the welding joint 19, so that the staff can conveniently operate the entire equipment to ensure the continuity and efficiency of production.

[0025] See also Figure 3 A sliding groove is provided on the inner wall of the mounting shell 3 , and the inner wall of the sliding groove is slidably connected to the outer wall of the top end of the moving component 2 , and two vacuum adsorption plates are installed on one side of the bottom end of the mounting shell 3 .

[0026] It should be noted that the sliding groove on the inner wall of the mounting shell 3 allows the mounting shell 3 to slide smoothly on the top of the moving component 2 to ensure the good operation of the equipment, reduce friction and wear, and extend the service life of the equipment. At the same time, the vacuum suction cup installed at the bottom of the mounting shell 3 allows the mounting shell 3 to absorb the components, reducing the contact of the staff with the components and reducing the risk of component damage or contamination due to human factors.

[0027] Working principle: The mounting shell 3 is installed on the top of the moving component 2, so that the mounting shell 3 can be moved in the horizontal direction of the moving component 2 to meet the welding requirements of different positions. The crank 5 rotated by the first motor 4 starts to rotate by starting the first motor 4. The inner wall of the crank 5 is rotated to connect the first connecting rod 6. The end of the first connecting rod 6 away from the crank 5 is rotated to connect the second connecting rod 7. The rotation of the crank 5 drives the movement of the first connecting rod 6. One end of the second connecting rod 7 is rotated to connect the rotating block 8. The rotating block 8 A push rod 9 is fixedly installed at the bottom. When the first motor 4 is started, the crank 5 and the first connecting rod 6 work together to push the second connecting rod 7 to drive the push rod 9 to move up and down, and the height of the welding head 19 is adjusted in real time to ensure that the appropriate welding pressure is always maintained during the welding process. The inner wall of the first connecting rod 6 is also rotatably connected to the third connecting rod 10, and the end of the third connecting rod 10 away from the first connecting rod 6 is connected to the fourth connecting rod 11, and the first sliding block 12 is connected through the fourth connecting rod 11. The outer wall of the first sliding block 12 is slidably connected to the guide The first sliding block 12 is provided with a thread groove on its inner wall, and the thread arranged on the inner wall of the thread groove matches the thread on the surface of the screw rod 13, so the inner wall of the first sliding block 12 is threadedly connected with the outer wall of the screw rod 13, and the second bevel gear 15 is driven to rotate synchronously by the rotation of the second motor 17. Specifically, when the second motor 17 starts to start and rotates, the power is transmitted to the second bevel gear 15 through the rotating shaft 16. Since the second bevel gear 15 is meshed with the first bevel gear 14, the rotational motion can be transmitted to each other, and the screw rod 13 is rotated synchronously with the second bevel gear 15. The bottom end is fixedly connected to the first bevel gear 14, so when the first bevel gear 14 rotates with the rotation of the second bevel gear 15, the screw rod 13 will also rotate. The rotation of the screw rod 13 can allow the matching first sliding block 12 to move along the axial direction of the screw rod 13. This axial movement is the effect of the adaptation of the thread on the screw rod 13 to the inner wall thread of the first sliding block 12. The movement of the first sliding block 12 will drive the third connecting rod 10 to adjust the displacement of the first connecting rod 6, so that the distance the push rod 9 is pushed out will change to adapt to different work requirements.

[0028] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A PCB welding device for a carrier module, comprising a chassis (1) and a moving component (2), characterized in that: The top end of the moving component (2) is slidably connected to a mounting shell (3), the inner wall of the mounting shell (3) is installed with an adjustment component, and the adjustment component comprises a first motor (4) installed on the inner wall of the mounting shell (3), one end of the first motor (4) is rotatably connected to a crank (5), the inner wall of the crank (5) is rotatably connected to a first connecting rod (6), the end of the first connecting rod (6) away from the crank (5) is rotatably connected to a second connecting rod (7), the bottom end of the second connecting rod (7) is rotatably connected to a rotating block (8), the bottom end of the rotating block (8) is fixedly connected to a push rod (9), the bottom end of the push rod (9) is installed with a welding head (19), and the inner wall of the first connecting rod (6) is also rotatably connected to A third connecting rod (10) is connected, and one end of the third connecting rod (10) away from the first connecting rod (6) is connected to a fourth connecting rod (11), one end of the fourth connecting rod (11) is installed with a first sliding block (12), the inner wall of the first sliding block (12) is rotatably connected to a screw rod (13), the bottom end of the screw rod (13) is installed with a first bevel gear (14), one side outer wall of the first bevel gear (14) is meshingly connected to a second bevel gear (15), a rotating shaft (16) is installed in the middle of the second bevel gear (15), one end of the rotating shaft (16) is rotatably connected to a second motor (17), and the outer walls of the rotating shaft (16) and the screw rod (13) are both connected to a first connecting plate (18).

2. A PCB board welding device for a carrier module as claimed in claim 1, characterized in that: A centering clamping assembly is installed inside the chassis (1), and the centering clamping assembly comprises a mounting plate (20) mounted on the inner wall of the chassis (1), an electric telescopic rod (21) is mounted on the bottom end of the mounting plate (20), one end of the electric telescopic rod (21) is slidably connected to a connecting rod (22), an end of the connecting rod (22) away from the electric telescopic rod (21) is fixedly connected to a second connecting plate (23), a top outer wall of the second connecting plate (23) is connected to a second sliding block (24), and a top end of the mounting plate (20) away from the second connecting plate (23) is fixedly connected to a second connecting plate (23), and a second sliding block (24) is connected to a second sliding block (24). A third sliding block (25) is slidably connected to one side of the second sliding block (24); a first rack (26) is connected to an outer wall on one side of the bottom end of the second sliding block (24); a second rack (27) is connected to an outer wall on one side of the bottom end of the third sliding block (25); a cylindrical gear (28) is mounted on an outer wall on a side opposite to the second rack (27) and the first rack (26); a rotating rod (29) is provided in the middle of the cylindrical gear (28); and a clamp (30) is connected to the top of each of the second sliding block (24) and the third sliding block (25).

3. A PCB board welding device for a carrier module as claimed in claim 2, characterized in that: Vertical sliding bars (31) are installed on both sides of the top of the chassis (1), and a sliding bar is installed on the outer wall on one side opposite to each of the vertical sliding bars (31).

4. A PCB board welding device for a carrier module as claimed in claim 3, characterized in that: A control panel (32) is installed on one side outer wall of the chassis (1), a plurality of control buttons are installed on the surface of the control panel (32), and the control panel (32) is electrically connected to the adjustment component and the centering clamping component.

5. A PCB board welding device for a carrier module as claimed in claim 4, characterized in that: The outer wall of the first motor (4) is fixedly connected to the inner wall of the mounting shell (3); the end of the crank (5) away from the first motor (4) is rotatably connected to the inner wall of the mounting shell (3); the outer wall of the push rod (9) is fixedly connected to the inner wall of the mounting shell (3); and the outer wall of one end of the first sliding block (12) is slidably connected to a guide rail.

6. A PCB board welding device for a carrier module as claimed in claim 5, characterized in that: The inner wall of the installation shell (3) is provided with a sliding groove, the inner wall of the sliding groove is slidably connected to the outer wall of the top end of the moving component (2), and two vacuum adsorption plates are installed on one side of the bottom end of the installation shell (3).

7. A PCB board welding device for a carrier module as claimed in claim 6, characterized in that: A protective pad is installed on one side opposite to the two clamps (30); the material of the protective pad is an insulating flexible material, and the surface of the protective pad is evenly paved with anti-slip patterns.

8. A PCB board welding device for a carrier module as claimed in claim 7, characterized in that: The first rack (26) and the second rack (27) are meshingly connected to the cylindrical gear (28), the rotating rod (29) is rotatably connected to the cylindrical gear (28), one end of the rotating rod (29) away from the cylindrical gear (28) is fixedly connected to the top of the mounting plate (20), and the bottom ends of the second sliding block (24) and the third sliding block (25) are each provided with a through groove, and the width of each through groove is adapted to the width of the first rack (26) and the second rack (27).