Clamping and feeding device for assembling and welding of printed board and using method of clamping and feeding device

Abstract

The invention discloses a clamping and feeding device for assembling and welding a printed board and a using method. The clamping and feeding device comprises a welding workbench and a welding frame. A conveying belt is embedded in the welding workbench, the welding frame is fixedly arranged above the welding workbench, a welding assembly is arranged in the welding frame, clamping hydraulic rods are symmetrically arranged on the two sides of the welding workbench and located above the conveying belt, and the output ends of the clamping hydraulic rods are fixedly connected with clamping plates. The fixed end of the clamping hydraulic rod is arranged on the side wall of the welding workbench. A feeding frame is arranged at one end of the welding workbench, and a clamping and feeding assembly is arranged in the feeding frame. According to the invention, automatic feeding of multi-size printed boards can be realized, and the welding efficiency is improved; and the printed board can be limited at the central position, so that the welding position precision of a product is improved, the welding quality and the reliability of the product are remarkably improved, and the overall production efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic assembly welding of electronic and electrical products, and specifically refers to a clamping and feeding device for printed circuit board assembly welding and a use method thereof. Background Art

[0002] During the electronic assembly of printed circuit boards, when soldering components, the PCB needs to be clamped and fixed. The patent with the publication number CN212049090U discloses a new type of feeding device for printed circuit board production. The conveyor belt drives multiple isolation plates to move. The isolation plates can isolate the circuit boards in turn. When adjusting the feeding angle, the second motor drives the worm to rotate, the worm wheel drives the screw to rotate, the adjustment column drives the moving seat to move upward, the moving seat drives the mounting seat to rotate, the mounting seat drives the feeding plate to rotate, and the first bracket passively rotates on the fixed seat, so that the feeding position of the feeding device can be adjusted. However, the isolation plates in the patent are designed with a fixed spacing and cannot be adjusted according to the actual size of the printed board, which greatly limits the compatibility and flexibility of the device for printed boards of different specifications. Moreover, the positioning and transmission of the printed board only rely on the isolation plate, lacking a more stable clamping mechanism, which is easy to cause the printed board to shake or deviate during high-speed transmission or precision operation, thereby affecting the subsequent welding accuracy and quality. Especially for small, thin or high-precision printed boards, this instability is particularly prominent. The above two types of devices fail to solve the problem of automatic feeding of printed circuit boards of multiple sizes.

[0003] Therefore, there is an urgent need for a clamping and loading device that can stably clamp printed circuit boards of various sizes and can automatically load them. Summary of the invention

[0004] The object of the present invention is to provide a clamping and loading device for printed circuit board assembly and welding and a method for using the device, which can realize automatic loading of printed circuit boards of various sizes, improve welding efficiency, and ensure the accuracy of product welding position to overcome the shortcomings of the prior art that printed circuit boards of different sizes are inconvenient to load, have poor stability, and have low welding efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: On the one hand, the present invention provides a clamping and loading device for printed circuit board assembly and welding, comprising a welding workbench and a welding frame; the welding workbench is embedded with a conveyor belt, the welding frame is fixedly arranged above the welding workbench, a welding assembly is arranged inside the welding frame, clamping hydraulic rods are symmetrically arranged on both sides of the welding workbench and are above the conveyor belt, the output end of the clamping hydraulic rod is fixedly connected with a clamping plate, and the fixed end of the clamping hydraulic rod is arranged on the side wall of the welding workbench; a loading frame is arranged at one end of the welding workbench, and a clamping and loading assembly is arranged in the loading frame; the clamping plate is pushed to move by the clamping hydraulic rod so that the clamping plate clamps the printed circuit board on the conveyor belt, thereby limiting the printed circuit board to the center of the conveyor belt, so that the printed circuit board does not shake during welding, has higher stability, is convenient for welding, and also improves the welding quality.

[0006] Furthermore, the clamping and loading assembly includes a loading hydraulic rod and a loading assembly, one end of the loading hydraulic rod is connected to the bottom of the loading rack, and the other end is fixedly connected to a loading push plate; the loading assembly is arranged on one side of the upper part of the loading rack, and the loading hydraulic rod can push the loading push plate up and down, so that the height of the printed circuit boards stacked on the loading push plate is flush with the conveyor belt, which is convenient for clamping the top printed circuit board.

[0007] Furthermore, the feeding assembly includes a fixed frame, one end of the fixed frame is fixedly connected to the inner wall of the upper part of the feeding frame, and the other end is connected to the outside of a feeding motor; a feeding screw is rotatably arranged in the fixed frame, the output end of the feeding motor is connected to the feeding screw, a feeding slider is slidably arranged in the fixed frame, the feeding screw is connected to the feeding slider, one end of a feeding connecting rod is fixedly connected to the lower part of the feeding slider, the other end of the feeding connecting rod is connected to a clamping assembly, a feeding guide rod is fixedly arranged in the fixed frame and the two feeding guide rods are symmetrically arranged on both sides of the feeding screw; the feeding guide rod passes through the feeding slider.

[0008] Furthermore, the clamping assembly includes a clamping bracket and a clamping screw; the outer side of the clamping bracket is connected to the feeding connecting rod, and a clamping limit block is arranged at the inner center, the clamping screw passes through the clamping limit block and both ends of the clamping screw are rotatably arranged on the inner side of the clamping bracket, and clamping plates are symmetrically arranged on both sides of the clamping screw; a clamping motor is arranged on the outer side of the clamping bracket and the output end of the clamping motor is connected to the clamping screw.

[0009] Furthermore, a left thread and a right thread are respectively arranged on both sides of the clamping screw, and the left thread and the right thread are symmetrically arranged on both sides of the clamping limit block, and the left thread and the right thread are both engaged with the corresponding clamping plate.

[0010] Furthermore, the welding assembly includes an adjusting screw; both ends of the adjusting screw are rotatably arranged above the inner wall of the welding frame, a welding slider is slidably arranged on the adjusting screw, a welding connecting rod is fixedly connected below the welding slider, and a welding head is fixedly connected below the welding connecting rod; an adjusting motor is arranged on the outside of the welding frame and the output end of the adjusting motor is connected to the adjusting screw.

[0011] In another aspect, the present invention further provides a method for using a clamping and loading device for printed circuit board assembly and welding, which specifically comprises the following steps: S1, the clamping and loading assembly arranged in the loading rack clamps the printed circuit board and moves it to the welding workbench; S2, the printed board reaches the top of the conveyor belt, and the clamping and loading assembly releases the printed board onto the conveyor belt, completing the clamping and loading of the printed board; this step not only realizes the automatic loading of the printed board, but also ensures its stability and safety during the transmission process; S3, the clamping hydraulic rod pushes the clamping plate to move, so that the clamping plate clamps the printed circuit board on the conveyor belt and limits the printed circuit board to the center of the conveyor belt; effectively preventing the shaking and deviation of the printed circuit board during welding, and improving welding efficiency and quality; S4, the welding assembly arranged inside the welding frame welds the printed circuit board.

[0012] Furthermore, in S2, after the printed board reaches above the conveyor belt, the clamping motor reverses, the clamping plate releases the printed board, and after the clamping and loading assembly completes loading, the clamping and loading assembly resets to the initial state and waits for the next loading operation.

[0013] Furthermore, the clamping assembly drives the clamping screw to rotate through the clamping motor, so that the clamping plate can move left and right on the clamping screw to clamp the printed circuit board; the feeding assembly drives the feeding screw to rotate through the feeding motor, so that the feeding slider moves left and right along the feeding guide rod under the movement of the feeding screw, and the feeding slider drives the feeding connecting rod, and the feeding connecting rod drives the clamping assembly.

[0014] Furthermore, the welding assembly drives the adjusting screw to rotate through the adjusting motor, so that the welding slider moves left and right on the adjusting screw, the welding slider drives the welding connecting rod to move, and the welding connecting rod drives the welding head to move.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a clamping and feeding device for printed circuit board assembly and welding. The clamping and feeding assembly can adjust the clamping spacing to achieve clamping of printed circuit boards of multiple sizes, and move the printed circuit boards to the conveyor belt to complete the clamping and feeding of the printed circuit boards. The clamping hydraulic rod pushes the clamping plate to move so that the clamping plate clamps the printed circuit board on the conveyor belt, thereby limiting the printed circuit board to the center of the conveyor belt for convenient welding. The present invention can not only realize the automatic feeding of printed circuit boards of multiple sizes and improve welding efficiency, but also limit the printed circuit board to the center position, improve the accuracy of product welding position, effectively reduce welding defects caused by position deviation during welding, such as cold welding and short circuit, significantly improve welding quality and product reliability, and further improve overall production efficiency.

[0016] Specifically, the clamping and feeding assembly includes a feeding hydraulic rod and a feeding assembly, the feeding assembly is connected to the clamping assembly, the clamping assembly drives the clamping screw to rotate through the clamping motor, the left thread and the right thread are respectively arranged on both sides of the clamping screw, the left thread and the right thread are symmetrically arranged on both sides of the clamping limit block, the left thread and the right thread are meshed with the corresponding clamping plates, so that the two clamping plates can move left and right on the clamping screw, when the clamping motor is started and drives the clamping screw to rotate, the left thread and the right thread will respectively drive the clamping plates on both sides to move toward the center or outward. Due to the meshing of the thread and the clamping plate, the two clamping plates can be accurately approached or separated, thereby achieving the clamping of printing plates of different sizes.

[0017] Specifically, the loading hydraulic rod pushes the loading push plate up and down, so that the height of the printed circuit boards piled on the loading push plate is flush with the conveyor belt, which makes it easier for the clamping assembly to clamp the top printed circuit board, thereby improving the clamping efficiency and further improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is an overall schematic diagram of a clamping and loading device for printed circuit board assembly and welding in an embodiment of the present invention.

[0019] Figure 2 The figure is a schematic top view of the structure of a clamping and loading device for printed circuit board assembly and welding in an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the side view of a clamping and loading device for printed circuit board assembly and welding in an embodiment of the present invention Figure 4 The figure is a schematic diagram of the structure of a welding assembly of a clamping and loading device for printed circuit board assembly in an embodiment of the present invention.

[0021] Figure 5 The present invention is a schematic diagram of a structure of a loading component of a clamping loading device for printed circuit board assembly and welding in an embodiment of the present invention.

[0022] In the figure, 1. welding workbench; 2. conveyor belt; 3. welding frame; 5. clamping plate; 6. clamping hydraulic rod; 7. feeding frame; 9. feeding hydraulic rod; 10. feeding push plate; 11. feeding assembly; 12. clamping assembly; 13. fixed frame; 14. feeding slider; 15. feeding connecting rod; 16. feeding screw rod; 17. feeding motor; 18. clamping bracket; 19. clamping plate; 20. clamping screw rod; 21. clamping motor; 22. welding connecting rod; 23. welding head; 24. welding slider; 25. adjusting screw rod; 26. adjusting motor; 27. clamping limit block; 28. left thread; 29. ​​right thread; 30. feeding guide rod. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In conjunction with the accompanying drawings, a clamping and loading device for printed circuit board assembly and welding provided by the present invention is further described; See also Figure 1 to Figure 2, including a welding workbench 1 and a welding frame 3; the welding workbench 1 is embedded with a conveyor belt 2, the welding frame 3 is fixedly arranged above the welding workbench 1, and a welding assembly is arranged inside the welding frame 3. Clamping hydraulic rods 6 are symmetrically arranged on both sides of the welding workbench 1 and are located above the conveyor belt 2. The output end of the clamping hydraulic rod 6 is fixedly connected with a clamping plate 5, and the fixed end of the clamping hydraulic rod 6 is arranged on the side wall of the welding workbench 1; a loading rack 7 is arranged at one end of the welding workbench 1, and a clamping and loading assembly is arranged in the loading rack 7; the clamping and loading assembly clamps the printing plate and puts it above the conveyor belt 2, Thus, the clamping and loading of the printed circuit board is completed, and the clamping hydraulic rod 6 pushes the clamping plate 5 to move, so that the clamping plate 5 clamps the printed circuit board on the conveyor belt 2, thereby limiting the printed circuit board to the center of the conveyor belt 2, so that the printed circuit board does not shake during welding, has higher stability, is convenient for welding, and also improves the welding quality; the welding assembly arranged inside the welding frame 3 is used for welding the printed circuit board, and the welding assembly can move left and right to perform all-round welding on the printed circuit board, and can more accurately align the welding points, thereby greatly improving the welding accuracy and efficiency, avoiding the situation of leaking welding and cold welding, and further improving the overall quality and reliability of the product.

[0026] Example 2 See also Figure 1 , Figure 2 , Figure 3 and Figure 5 On the basis of Example 1, the clamping and loading assembly is further described. The clamping and loading assembly includes a loading hydraulic rod 9 and a loading assembly 11. One end of the loading hydraulic rod 9 is connected to the bottom of the loading frame 7, and the other end is fixedly connected to a loading push plate 10; the loading hydraulic rod 9 gradually extends or shortens, and can drive the loading push plate 10 to rise or fall steadily in the vertical direction. As the loading push plate 10 gradually rises, the printed circuit boards stacked thereon are also slowly lifted. When the loading push plate 10 rises to a certain height, the printed circuit boards stacked on the top are flush with the surface of the conveyor belt 2 below, so that the top printed circuit board can be clamped conveniently; The feeding assembly 11 is arranged on one side of the upper part of the feeding frame 7; the feeding assembly 11 includes a fixed frame 13, one end of the fixed frame 13 is fixedly connected to the inner side wall of the upper part of the feeding frame 7, and the other end is connected to the outer side of the feeding motor 17; a feeding screw rod 16 is rotatably arranged in the fixed frame 13, and the output end of the feeding motor 17 is connected to the feeding screw rod 16, and the rotation of the feeding motor 17 can drive the feeding screw rod 16 to rotate; a feeding guide rod 30 is fixedly arranged in the fixed frame 13 and two feeding guide rods 30 are symmetrically arranged on both sides of the feeding screw rod 16; the feeding guide rod 30 passes through a feeding slider 14, and the feeding screw rod 16 is connected to the feeding slider 14 by a thread, and the rotation of the feeding screw rod 16 drives the feeding slider 14 to move on the feeding guide rod 30, and one end of the feeding connecting rod 15 is fixedly connected to the lower part of the feeding slider 14, and the other end of the feeding connecting rod 15 is connected to the clamping assembly 12, and the clamping assembly 12 clamps the printed circuit board.

[0027] The clamping assembly 12 includes a clamping bracket 18 and a clamping screw 20; the outer side of the clamping bracket 18 is connected to the feeding connecting rod 15, and a clamping limit block 27 is arranged at the inner center, the clamping screw 20 passes through the clamping limit block 27 and the two ends of the clamping screw 20 are rotatably arranged on the inner side of the clamping bracket 18, and clamping plates 19 are symmetrically arranged on both sides of the clamping screw 20; a clamping motor 21 is arranged on the outer side of the clamping bracket 18 and the output end of the clamping motor 21 is connected to the clamping screw 20; the left thread 28 and the right thread 29 are respectively arranged on both sides of the clamping screw 20 The left thread 28 and the right thread 29 are symmetrically arranged on both sides of the clamping limit block 27, and the left thread 28 and the right thread 29 are both engaged with the corresponding clamping plate 19; the rotation of the clamping motor 21 can drive the clamping screw 20 to rotate, and the rotation of the clamping screw 20 can drive the clamping plate 19 to rotate, and the threads arranged at both ends of the clamping screw 20 are opposite, so the two clamping plates 19 rotate in opposite directions when rotating, and then the distance between the two clamping plates 19 can be adjusted, so that the clamping assembly 12 can clamp printed circuit boards of different sizes and clamp them firmly.

[0028] Example 3 See also Figures 1 to 4On the basis of Example 2, the welding assembly is further described, and the welding assembly includes an adjusting screw 25; the two ends of the adjusting screw 25 are rotatably arranged above the inner wall of the welding frame 3, a welding slider 24 is slidably arranged on the adjusting screw 25, a welding connecting rod 22 is fixedly connected below the welding slider 24, and a welding head 23 is fixedly connected below the welding connecting rod 22; an adjusting motor 26 is arranged on the outer side of the welding frame 3, and the output end of the adjusting motor 26 is connected to the adjusting screw 25; the adjusting motor 26 rotates to drive the adjusting screw 25 to rotate, and the adjusting screw 25 rotates to enable the welding slider 24 to slide on the adjusting screw 25, and then the welding slider 24 drives the welding connecting rod 22 to rotate. The rod 22 and the welding head 23 realize precise position control and adjustment during the welding operation, further improving the welding quality and the convenience of operation. The welding head 23 can move left and right above the clamping hydraulic rod 6 and the clamping plate 5, thereby realizing the precise coverage and positioning of the printed circuit board in the working area by the welding head. The clamping hydraulic rod 6 pushes the clamping plate 5 to move, so that the clamping plate 5 clamps the printed circuit board on the conveyor belt 2, thereby limiting the printed circuit board to the center of the conveyor belt 2. This not only effectively prevents the shaking and displacement of the printed circuit board during welding, but also ensures that the welding head 23 can accurately align with the welding points on the printed circuit board to operate, thereby significantly improving the welding accuracy and efficiency.

[0029] Example 4 A method for using a clamping and loading device for printed circuit board assembly and welding, specifically comprising the following steps: S1, the clamping assembly 12 of the clamping and loading assembly arranged in the loading rack 7 drives the clamping screw 20 to rotate through the clamping motor 21, so that the clamping plate 19 can move left and right on the clamping screw 20, clamp the printed circuit board and move it to the welding workbench 1; the left thread and the right thread are respectively arranged on both sides of the clamping screw, and the left thread and the right thread are symmetrically arranged on both sides of the clamping limit block, and the left thread and the right thread are both engaged with the corresponding clamping plates, so that both clamping plates can move left and right on the clamping screw. When the clamping motor is started and drives the clamping screw to rotate, the left thread and the right thread will respectively drive the clamping plates on both sides to move toward the center or outward. Due to the engagement of the thread and the clamping plate, the two clamping plates can be accurately approached or moved away, thereby realizing the clamping of printed circuit boards of different sizes. This step not only realizes the automatic loading of printed circuit boards, but also ensures their stability and safety during the transmission process; S2, the printed board arrives above the conveyor belt 2, the feeding assembly 11 of the clamping feeding assembly drives the feeding screw 16 to rotate through the feeding motor 17, so that the feeding slider 14 moves left and right along the feeding guide rod 30 under the movement of the feeding screw 16, so that the feeding slider 14 drives the feeding connecting rod 15 to move, the feeding slider 14 not only maintains a high degree of stability, but also transmits the movement to the clamping assembly 12 through the feeding connecting rod 15, the feeding connecting rod 15 drives the clamping assembly 12, the clamping motor 21 of the clamping assembly 12 reverses, the clamping plate releases the printing plate, and after the clamping feeding assembly completes the feeding, the clamping feeding assembly resets to the initial state and waits for the next feeding operation; S3, the clamping hydraulic rod 6 pushes the clamping plate 5 to move, so that the clamping plate 5 clamps the printed circuit board on the conveyor belt 2, and the printed circuit board is confined at the center of the conveyor belt 2; the shaking and deviation of the printed circuit board during the welding process are effectively prevented, and the welding efficiency and quality are improved; S4, the welding assembly arranged inside the welding frame 3 drives the adjusting screw 25 to rotate through the adjusting motor 26, so that the welding slider 24 moves left and right on the adjusting screw 25, and the welding slider 24 drives the welding connecting rod 22 to move. The welding slider 24 not only maintains a high degree of stability and flexibility, but also accurately transmits the movement to the welding head 23 through the welding connecting rod 22. The welding connecting rod 22 drives the welding head 23 to move to weld the printed circuit board. With the precise movement and positioning of the welding head 23, it begins to perform efficient and accurate welding operations on the welding points on the printed circuit board.

[0030] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A clamping and feeding device for printed circuit board assembly and welding, characterized in that: The invention comprises a welding workbench (1) and a welding frame (3); the welding workbench (1) is embedded with a conveyor belt (2); the welding frame (3) is fixedly arranged above the welding workbench (1); a welding assembly is arranged inside the welding frame (3); clamping hydraulic rods (6) are symmetrically arranged on both sides of the welding workbench (1) and are located above the conveyor belt (2); the output end of the clamping hydraulic rod (6) is fixedly connected to a clamping plate (5); the fixed end of the clamping hydraulic rod (6) is arranged on the side wall of the welding workbench (1); a loading frame (7) is arranged at one end of the welding workbench (1); a clamping loading assembly is arranged inside the loading frame (7).

2. A clamping and feeding device for printed circuit board assembly and welding according to claim 1, characterized in that: The clamping and loading assembly comprises a loading hydraulic rod (9) and a loading assembly (11); one end of the loading hydraulic rod (9) is connected to the bottom of the loading rack (7), and the other end is fixedly connected to a loading push plate (10); the loading assembly (11) is arranged on one side of the upper part of the loading rack (7).

3. A clamping and feeding device for printed circuit board assembly and welding according to claim 2, characterized in that: The feeding assembly (11) comprises a fixed frame (13), one end of the fixed frame (13) is fixedly connected to the inner side wall of the upper part of the feeding frame (7), and the other end is connected to the outer side of the feeding motor (17); a feeding screw rod (16) is rotatably arranged in the fixed frame (13), and the output end of the feeding motor (17) is connected to the feeding screw rod (16); a feeding slider (14) is slidably arranged in the fixed frame (13), the feeding screw rod (16) is connected to the feeding slider (14), one end of a feeding connecting rod (15) is fixedly connected below the feeding slider (14), and the other end of the feeding connecting rod (15) is connected to the clamping assembly (12); a feeding guide rod (30) is fixedly arranged in the fixed frame (13), and two feeding guide rods (30) are symmetrically arranged on both sides of the feeding screw rod (16); the feeding guide rod (30) passes through the feeding slider (14).

4. A clamping and loading device for printed circuit board assembly and welding according to claim 3, characterized in that: The clamping assembly (12) comprises a clamping bracket (18) and a clamping screw (20); the outer side of the clamping bracket (18) is connected to the feeding connecting rod (15), and a clamping limit block (27) is arranged at the center of the inner side; the clamping screw (20) passes through the clamping limit block (27) and both ends of the clamping screw (20) are rotatably arranged on the inner side of the clamping bracket (18), and clamping plates (19) are symmetrically arranged on both sides of the clamping screw (20); a clamping motor (21) is arranged on the outer side of the clamping bracket (18), and the output end of the clamping motor (21) is connected to the clamping screw (20).

5. A clamping and loading device for printed circuit board assembly and welding according to claim 4, characterized in that: A left thread (28) and a right thread (29) are respectively provided on both sides of the clamping screw (20); the left thread (28) and the right thread (29) are symmetrically arranged on both sides of the clamping limit block (27); and the left thread (28) and the right thread (29) are both engaged with the corresponding clamping plate (19).

6. A clamping and loading device for printed circuit board assembly and welding according to claim 5, characterized in that: The welding assembly comprises an adjusting screw (25); both ends of the adjusting screw (25) are rotatably arranged above the inner wall of the welding frame (3); a welding slider (24) is slidably arranged on the adjusting screw (25); a welding connecting rod (22) is fixedly connected below the welding slider (24); and a welding head (23) is fixedly connected below the welding connecting rod (22); an adjusting motor (26) is arranged outside the welding frame (3), and the output end of the adjusting motor (26) is connected to the adjusting screw (25).

7. A method for using a clamping and loading device for printed circuit board assembly and welding as claimed in claim 6, characterized in that: The following steps are involved: S1, a clamping and loading assembly provided in a loading rack (7) clamps the printed circuit board and moves it toward the welding workbench (1); S2, the printed circuit board arrives above the conveyor belt (2), and the clamping and loading assembly releases the printed circuit board onto the conveyor belt (2), completing the clamping and loading of the printed circuit board; S3, the clamping hydraulic rod (6) pushes the clamping plate (5) to move, so that the clamping plate (5) clamps the printed circuit board on the conveyor belt (2) and limits the printed circuit board to the center of the conveyor belt (2); S4, the welding assembly arranged inside the welding frame (3) welds the printed circuit board.

8. The method for using the clamping and loading device for printed circuit board assembly and welding according to claim 7, characterized in that: In S2, after the printed board reaches the top of the conveyor belt (2), the clamping motor (21) is reversed, the clamping plate (19) releases the printed board, and after the clamping and loading assembly completes loading, the clamping and loading assembly is reset to the initial state and waits for the next loading operation.

9. The method for using the clamping and loading device for printed circuit board assembly and welding according to claim 8, characterized in that: The clamping assembly (12) drives the clamping screw (20) to rotate via the clamping motor (21), so that the clamping plate (19) can move left and right on the clamping screw (20) to clamp the printed circuit board; the feeding assembly (11) drives the feeding screw (16) to rotate via the feeding motor (17), so that the feeding slider (14) moves left and right along the feeding guide rod (30) under the movement of the feeding screw (16), and the feeding slider (14) drives the feeding connecting rod (15), and the feeding connecting rod (15) drives the clamping assembly (12).

10. The method for using the clamping and loading device for printed circuit board assembly and welding according to claim 9, characterized in that: The welding assembly drives the adjusting screw (25) to rotate via the adjusting motor (26), so that the welding slider (24) moves left and right on the adjusting screw (25), the welding slider (24) drives the welding connecting rod (22) to move, and the welding connecting rod (22) drives the welding head (23) to move.

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