Clamp for welding circuit board

Abstract

The utility model belongs to the technical field of clamps, and particularly relates to a clamp for welding a circuit board, which comprises a base, supporting plates symmetrically and fixedly mounted at the top of the base, a rotating plate rotationally mounted between the two supporting plates, a limiting groove formed in one side of the rotating plate, a first bidirectional threaded rod rotationally mounted in the limiting groove, and a second bidirectional threaded rod rotationally mounted in the limiting groove. Two limiting blocks are installed in the limiting groove and located on the first bidirectional threaded rod in a sliding mode, fixing rods are fixedly installed on one sides of the limiting blocks, sliding grooves are formed in the opposite sides of the two fixing rods, and second bidirectional threaded rods are rotatably installed in the sliding grooves. When the circuit board is welded, the circuit board does not shake, the quality of the welded circuit board is prevented from being affected, meanwhile, the circuit board can be turned over by 180 degrees, the back face of the circuit board can be welded, the circuit board does not need to be disassembled in the process, and convenience is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamps, and in particular relates to a clamp used for welding a circuit board. Background Art

[0002] The main function of the circuit board is to provide electrical connections and mechanical support for electronic components. Through carefully designed circuit layout, signal transmission and power distribution between various electronic components are achieved.

[0003] For example, the Chinese patent with the publication number CN207083303U discloses an adjustable clamp for circuit board welding, including a fixed back clamp, a movable limit buckle and a buffer gasket, wherein the fixed back clamp is provided with a movable guide rail groove inside, the movable guide rail groove is provided with a guide fixed stretching rod and a reset elastic member inside, and the guide fixed stretching rod is located inside the reset elastic member, a movable limit buckle is provided on one side of the guide fixed stretching rod, and a buffer gasket is provided on one side of the movable limit buckle. The utility model can effectively solve the problem that the clamp cannot be adjusted in size by providing a movable limit buckle, can expand the size between the buckles by pulling up the reset elastic member to meet the work of circuit boards of different sizes, and can effectively prevent the circuit board from being damaged due to the welding action when it is stuck by the buckle by providing a buffer gasket, thereby effectively extending the service life of the circuit board.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when used, such as: after the device fixes the circuit board, the reset elastic member has a certain elasticity, which will cause shaking when the circuit board is welded, which will affect the quality of the circuit board after welding, and after the device fixes the circuit board, it can only weld the top surface of the circuit board, and the back of the circuit board also needs to be welded. The device can only remove the circuit board and turn it over, and then fix it again before welding the back of the circuit board, which is inconvenient. In view of this, we propose a clamp for welding circuit boards. Utility Model Content

[0006] The purpose of the utility model is to provide a clamp for welding a circuit board to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a clamp for welding a circuit board, comprising:

[0008] The cam is provided with a plurality of movable lids, and the movable lid is provided with a plurality of movable lids, and the movable lid is provided with a plurality of movable lids on the movable lid.

[0009] A driving assembly, the driving assembly is located in the rotating plate and is used to drive the bidirectional threaded rod to rotate;

[0010] The motor is fixedly mounted on one side of one of the support plates, and the output end of the motor passes through one of the support plates and is fixed to the rotating plate.

[0011] In the present technical solution, when in use, the personnel places the circuit board between the two fixed rods, and then, through the provided driving assembly, the driving assembly drives the two-way threaded rod one to rotate, and under the action of the thread, the two-way threaded rod one will drive the two limit blocks to approach each other, and the two limit blocks will drive the corresponding fixed rods to approach each other until the two fixed rods are adjusted to appropriate positions, and then the staff can turn the knob on one of the two-way threaded rods two to drive one of the two-way threaded rods two to rotate, and under the action of the thread, one of the two-way threaded rods two will drive the two sliders to approach each other, and then the two sliders will drive the corresponding U-shaped plates to approach each other, and at the same time, the staff can also turn the knob on the other two-way threaded rod two by hand to drive the other two-way threaded rod two to rotate , then, another two-way threaded rod 2 will drive the other two sliders closer to each other, and the other two sliders will drive the corresponding U-shaped plates closer to each other, so that the four corners of the circuit board are respectively located on the top of the corresponding rubber pad 1. At this time, the four corners of the circuit board will be respectively located in the four U-shaped plates, and then the staff will turn the U-shaped plate by hand. Under the action of the thread, the U-shaped plate will rotate and move downward, and then the disc will also rotate and move downward until the rubber pad 2 at the bottom of the disc contacts the circuit board. At this time, the four corners of the circuit board will be fixed in the four U-shaped plates respectively, and then the circuit board can be welded. Under the action of rubber pad 2 and rubber pad 1, the materials of rubber pad 2 and rubber pad 1 are relatively soft, which avoids damage to the surface of the circuit board and can fix the circuit board more stably.

[0012] When it is necessary to weld the back of the circuit board, the staff starts the motor so that the output shaft of the motor drives the rotating plate to rotate. Subsequently, the rotating plate will drive the two limit blocks to rotate, and the two limit blocks will drive the corresponding fixing rods to rotate, so that the fixed circuit board can be rotated 180°, so that the back of the circuit board can be welded.

[0013] In the above technical solution, further, the driving component includes:

[0014] A power cavity, the power cavity is opened in the rotating plate, a worm wheel is rotatably installed in the power cavity, a worm is rotatably installed in the power cavity and on one side of the worm wheel, the worm wheel is meshed with the worm, one end of the worm wheel passes through one side of the power cavity and extends into the limiting groove, and one end of the worm wheel is coaxially connected with the bidirectional threaded rod, a motor is fixedly installed on the top of the rotating plate, the output end of the motor passes through the top of the rotating plate and extends into the power cavity, and the output end of the motor is coaxially connected with the worm.

[0015] In this technical solution, the motor is started so that the output shaft of the motor drives the worm to rotate in the forward direction. Under the action of meshing, the worm will drive the worm wheel to rotate, and then the worm wheel will drive the bidirectional threaded rod 1 to rotate. Under the action of the thread, the bidirectional threaded rod 1 will drive the two limit blocks closer to each other.

[0016] In the above technical solution, further, one end of the worm gear is rotationally connected to the limiting groove, and the output shaft of the motor is rotationally connected to the rotating plate and the power chamber.

[0017] In this technical solution, it is ensured that the worm gear can operate normally; it is ensured that the motor can operate normally.

[0018] In the above technical solution, further, the limit block is threadedly connected to a bidirectional threaded rod, and the bidirectional threaded rod is provided with two sections of threads with opposite rotation directions.

[0019] In this technical solution, under the action of the thread, the two-way threaded rod will drive the two limit blocks to move closer to or away from each other when it rotates.

[0020] In the above technical solution, further, the sliding block is threadedly connected to the second bidirectional threaded rod, and the second bidirectional threaded rod is provided with two sections of threads with opposite rotation directions.

[0021] In this technical solution, under the action of the thread, the two-way threaded rod 2 will drive the two sliders to move closer to each other or away from each other when it rotates.

[0022] In the above technical solution, further, a rubber pad 2 is fixedly installed on the bottom of the disc, a rubber pad 1 is fixedly installed on the U-shaped plate and directly below the rubber pad 2, and a knob is fixedly installed on one end of the bidirectional threaded rod 2.

[0023] In this technical solution, under the action of rubber pad 2 and rubber pad 1, the materials of rubber pad 2 and rubber pad 1 are relatively soft, avoiding damage to the surface of the circuit board, and at the same time can fix the circuit board more stably; the two-way threaded rod 2 can be rotated more conveniently through the knob.

[0024] In the above technical solution, further, the output shaft of the motor is rotatably connected to one of the support plates.

[0025] In this technical solution, it is ensured that the motor can run normally.

[0026] The beneficial effects of the utility model are:

[0027] The clamp for welding the circuit board ensures that the circuit board can be stably clamped and fixed through the cooperation among the supporting plate, the rotating plate, the limiting groove, the first bidirectional threaded rod, the motor, the fixing rod, the U-shaped plate, the hand-tightened screw, the limiting block, the sliding groove, the second bidirectional threaded rod, the disc, the sliding block and the driving component. When welding the circuit board, the circuit board will not shake, thus avoiding affecting the quality of the circuit board after welding. At the same time, the circuit board can be turned over 180 degrees so that the back side of the circuit board can be welded. This process does not require the circuit board to be disassembled, which is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0029] Figure 2 This is one of the structural schematic diagrams of the interior of the rotating plate in the utility model;

[0030] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0031] Figure 4 It is a schematic diagram of the regional structure of the U-shaped plate in the utility model;

[0032] Figure 5 This is the second schematic diagram of the structure inside the rotating plate in the utility model;

[0033] Figure 6 It is a schematic diagram of the regional structure of the fixing rod in the utility model.

[0034] The symbols in the figure are:

[0035] 1. Base; 2. Support plate; 3. Rotating plate; 4. Limiting groove; 5. Two-way threaded rod 1; 6. Motor; 7. Electric motor; 8. Fixed rod; 9. U-shaped plate; 10. Hand screw; 11. Limiting block; 12. Slide groove; 13. Two-way threaded rod 2; 14. Power chamber; 15. Worm gear; 16. Worm; 17. Rubber pad 1; 18. Disc; 19. Rubber pad 2; 20. Slider. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0037] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0039] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0040] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0041] Embodiment 1:

[0042] See also Figure 1 - Figure 6 As shown, this embodiment provides a clamp for welding a circuit board, comprising:

[0043] A base 1, a support plate 2 is symmetrically fixedly installed on the top of the base 1, a rotating plate 3 is rotatably installed between the two support plates 2, a limiting groove 4 is provided on one side of the rotating plate 3, a two-way threaded rod 5 is rotatably installed in the limiting groove 4, two limiting blocks 11 are slidably installed in the limiting groove 4 and on the two-way threaded rod 5, a fixed rod 8 is fixedly installed on one side of the limiting block 11, and a slide groove 12 is provided on the opposite sides of the two fixed rods 8, a two-way threaded rod 13 is rotatably installed in the slide groove 12, and two sliders 20 are slidably installed in the slide groove 12 and on the two-way threaded rod 13, a U-shaped plate 9 is fixedly installed on one side of the slider 20, a hand screw 10 is threadedly installed on the U-shaped plate 9, a disc 18 is fixedly installed on the bottom of the hand screw 10, and one end of the two-way threaded rod 13 passes through one side of the slide groove 12 and extends to the outside;

[0044] A driving assembly, which is located in the rotating plate 3 and is used to drive the bidirectional threaded rod 5 to rotate;

[0045] The motor 7 is fixedly mounted on one side of one of the support plates 2 , and the output end of the motor 7 passes through one of the support plates 2 and is fixed to the rotating plate 3 .

[0046] Among them, when in use, the personnel places the circuit board between the two fixing rods 8, and then, through the set driving assembly, the driving assembly drives the two-way threaded rod 1 5 to rotate, and under the action of the thread, the two-way threaded rod 1 5 will drive the two limit blocks 11 to approach each other, and the two limit blocks 11 will drive the corresponding fixing rods 8 to approach each other, until the two fixing rods 8 are adjusted to a suitable position, and then the staff can turn the knob on one of the two-way threaded rods 2 13 to drive one of the two-way threaded rods 2 13 to rotate, and under the action of the thread, one of the two-way threaded rods 2 13 will drive two of the sliders 20 to approach each other, and then, the two sliders 20 will drive the corresponding U-shaped plates 9 to approach each other, and at the same time, the staff can also turn the knob on the other two-way threaded rod 2 13 by hand to drive the other two-way threaded rod 2 13 to rotate, and then, Another two-way threaded rod 2 13 will drive the other two sliders 20 to approach each other, and the other two sliders 20 will drive the corresponding U-shaped plates 9 to approach each other, so that the four corners of the circuit board are respectively located on the top of the corresponding rubber pad 17. At this time, the four corners of the circuit board will be respectively located in the four U-shaped plates 9. Then the staff will turn the U-shaped plate 9 by hand. Under the action of the thread, the U-shaped plate 9 will rotate and move downward. Then, the disc 18 will also rotate and move downward until the rubber pad 2 19 at the bottom of the disc 18 contacts the circuit board. At this time, the four corners of the circuit board will be fixed in the four U-shaped plates 9 respectively. Then, the circuit board can be welded. Under the action of the rubber pad 2 19 and the rubber pad 1 17, the materials of the rubber pad 2 19 and the rubber pad 1 17 are relatively soft, which avoids damage to the surface of the circuit board and can fix the circuit board more stably.

[0047] When it is necessary to weld the back side of the circuit board, the staff starts the motor 7 so that the output shaft of the motor 7 drives the rotating plate 3 to rotate. Subsequently, the rotating plate 3 drives the two limit blocks 11 to rotate, and the two limit blocks 11 drive the corresponding fixing rods 8 to rotate, so that the fixed circuit board can be rotated 180°, so that the back side of the circuit board can be welded.

[0048] Embodiment 2:

[0049] This embodiment provides a clamp for welding a circuit board. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving component includes:

[0050] A power chamber 14 is provided in the rotating plate 3. A worm wheel 15 is rotatably installed in the power chamber 14. A worm 16 is rotatably installed in the power chamber 14 and on one side of the worm wheel 15. The worm wheel 15 is meshed with the worm 16. One end of the worm wheel 15 passes through one side of the power chamber 14 and extends into the limiting groove 4. One end of the worm wheel 15 is coaxially connected to a bidirectional threaded rod 5. A motor 6 is fixedly installed on the top of the rotating plate 3. The output end of the motor 6 passes through the top of the rotating plate 3 and extends into the power chamber 14. The output end of the motor 6 is coaxially connected to the worm 16.

[0051] Among them, start the motor 6, so that the output shaft of the motor 6 drives the worm 16 to rotate in the forward direction. Under the action of meshing, the worm 16 will drive the worm wheel 15 to rotate, and then the worm wheel 15 will drive the bidirectional threaded rod 5 to rotate. Under the action of the thread, the bidirectional threaded rod 5 will drive the two limit blocks 11 to approach each other.

[0052] Embodiment 3:

[0053] This embodiment provides a clamp for welding circuit boards. In addition to the technical solutions of the above embodiments, it also has the following technical features: one end of the worm gear 15 is rotatably connected to the limit groove 4, and the output shaft of the motor 6 is rotatably connected to the rotating plate 3 and the power chamber 14.

[0054] Among them, it is ensured that the worm gear 15 can operate normally; it is ensured that the motor 6 can operate normally.

[0055] Embodiment 4:

[0056] This embodiment provides a clamp for welding circuit boards. In addition to the technical solutions of the above embodiments, it also has the following technical features: the limit block 11 is threadedly connected to the bidirectional threaded rod 5, and the bidirectional threaded rod 5 is provided with two sections of threads with opposite rotation directions.

[0057] Wherein, under the action of the thread, when the bidirectional threaded rod 5 rotates, it will drive the two limit blocks 11 to move closer to or away from each other.

[0058] Embodiment 5:

[0059] This embodiment provides a clamp for welding circuit boards. In addition to the technical solutions of the above embodiments, it also has the following technical features: the slider 20 is threadedly connected to the bidirectional threaded rod 13, and the bidirectional threaded rod 13 is provided with two sections of threads with opposite rotation directions.

[0060] Wherein, under the action of the thread, when the bidirectional threaded rod 13 rotates, it will drive the two sliders 20 to move closer to each other or away from each other.

[0061] Embodiment 6:

[0062] The present embodiment provides a clamp for welding circuit boards. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: a rubber pad 2 19 is fixedly installed on the bottom of the disk 18, a rubber pad 17 is fixedly installed on the U-shaped plate 9 and directly below the rubber pad 2 19, and a knob is fixedly installed on one end of the bidirectional threaded rod 2 13.

[0063] Among them, under the action of rubber pad 2 19 and rubber pad 1 17, the materials of rubber pad 2 19 and rubber pad 1 17 are relatively soft, avoiding damage to the surface of the circuit board, and at the same time can fix the circuit board more stably; the two-way threaded rod 2 13 can be rotated more conveniently through the knob.

[0064] Embodiment 7:

[0065] This embodiment provides a clamp for welding a circuit board. In addition to the technical solutions of the above embodiments, it also has the following technical features: the output shaft of the motor 7 is rotatably connected to one of the support plates 2.

[0066] In this case, it is ensured that the motor 7 can run normally.

[0067] Working principle: When in use, the personnel places the circuit board between the two fixed rods 8, and then starts the motor 6 so that the output shaft of the motor 6 drives the worm 16 to rotate in the forward direction. Under the action of meshing, the worm 16 will drive the worm wheel 15 to rotate, and then the worm wheel 15 will drive the two-way threaded rod 15 to rotate. Under the action of the thread, the two-way threaded rod 15 will drive the two limit blocks 11 to approach each other, and the two limit blocks 11 will drive the corresponding fixed rods 8 to approach each other until the two fixed rods 8 are adjusted to the appropriate position. Then, the staff can turn the knob on one of the two-way threaded rods 13 and make it drive one of the two-way threaded rods 13 to rotate. Under the action of the thread, one of the two-way threaded rods 13 will drive two of the sliders 20 to approach each other, and then the two sliders 20 will drive the corresponding U-shaped plates 9 to approach each other. At the same time, the staff can also turn the knob on the other two-way threaded rod 13 by hand. And make it drive another two-way threaded rod 213 to rotate, then, another two-way threaded rod 213 will drive the other two sliders 20 to approach each other, and the other two sliders 20 will drive the corresponding U-shaped plates 9 to approach each other, so that the positions of the four corners of the circuit board are respectively located on the top of the corresponding rubber pad 17. At this time, the four corners of the circuit board will be respectively located in the four U-shaped plates 9, and then the staff will turn the U-shaped plate 9 by hand. Under the action of the thread, the U-shaped plate 9 will rotate and move downward, and then the disc 18 will also rotate and move downward until the rubber pad 219 at the bottom of the disc 18 contacts the circuit board. At this time, the four corners of the circuit board will be fixed in the four U-shaped plates 9 respectively, and then the circuit board can be welded. Under the action of the rubber pad 219 and the rubber pad 117, the materials of the rubber pad 219 and the rubber pad 117 are relatively soft, which avoids damage to the surface of the circuit board and can fix the circuit board more stably.

[0068] When it is necessary to weld the back side of the circuit board, the staff starts the motor 7 so that the output shaft of the motor 7 drives the rotating plate 3 to rotate. Subsequently, the rotating plate 3 drives the two limit blocks 11 to rotate, and the two limit blocks 11 drive the corresponding fixing rods 8 to rotate, so that the fixed circuit board can be rotated 180°, so that the back side of the circuit board can be welded.

[0069] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A clamp for welding a circuit board, characterized in that: include: A base (1), a support plate (2) is symmetrically fixedly installed on the top of the base (1), a rotating plate (3) is rotatably installed between the two support plates (2), a limiting groove (4) is provided on one side of the rotating plate (3), a bidirectional threaded rod (5) is rotatably installed in the limiting groove (4), two limiting blocks (11) are slidably installed in the limiting groove (4) and on the bidirectional threaded rod (5), a fixing rod (8) is fixedly installed on one side of the limiting block (11), and the two fixing rods (8) are both opposite to each other on one side. A slide groove (12) is provided, a bidirectional threaded rod (13) is rotatably installed in the slide groove (12), two sliders (20) are slidably installed in the slide groove (12) and on the bidirectional threaded rod (13), a U-shaped plate (9) is fixedly installed on one side of the slider (20), a hand screw (10) is threadedly installed on the U-shaped plate (9), a disc (18) is fixedly installed on the bottom of the hand screw (10), and one end of the bidirectional threaded rod (13) passes through one side of the slide groove (12) and extends to the outside; A driving assembly, the driving assembly being located in the rotating plate (3) and being used to drive the bidirectional threaded rod (5) to rotate; A motor (7) is fixedly mounted on one side of one of the support plates (2), and an output end of the motor (7) passes through one of the support plates (2) and is fixed to the rotating plate (3).

2. A clamp for welding a circuit board according to claim 1, characterized in that: The drive assembly comprises: A power chamber (14), wherein the power chamber (14) is opened in the rotating plate (3), a worm wheel (15) is rotatably installed in the power chamber (14), a worm (16) is rotatably installed in the power chamber (14) and located on one side of the worm wheel (15), the worm wheel (15) is meshed with the worm (16), one end of the worm wheel (15) passes through one side of the power chamber (14) and extends into the limiting groove (4), and one end of the worm wheel (15) is coaxially connected to the bidirectional threaded rod (5), a motor (6) is fixedly installed on the top of the rotating plate (3), the output end of the motor (6) passes through the top of the rotating plate (3) and extends into the power chamber (14), and the output end of the motor (6) is coaxially connected to the worm (16).

3. A clamp for welding a circuit board according to claim 2, characterized in that: One end of the worm wheel (15) is rotationally connected to the limiting groove (4), and the output shaft of the motor (6) is rotationally connected to the rotating plate (3) and the power chamber (14).

4. A clamp for welding a circuit board according to claim 1, characterized in that: The limit block (11) is threadedly connected to the bidirectional threaded rod (5), and the bidirectional threaded rod (5) is provided with two sections of threads with opposite rotation directions.

5. A clamp for welding a circuit board according to claim 1, characterized in that: The slide block (20) is threadedly connected to the second bidirectional threaded rod (13), and the second bidirectional threaded rod (13) is provided with two sections of threads with opposite rotation directions.

6. A clamp for welding a circuit board according to claim 1, characterized in that: A second rubber pad (19) is fixedly mounted on the bottom of the circular disc (18), a first rubber pad (17) is fixedly mounted on the U-shaped plate (9) and directly below the second rubber pad (19), and a knob is fixedly mounted on one end of the second bidirectional threaded rod (13).

7. A clamp for welding a circuit board according to claim 1, characterized in that: The output shaft of the motor (7) is rotationally connected to one of the support plates (2).

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