Support for fixing circuit board

Abstract

The utility model discloses a support for fixing a circuit board, which comprises a clamping assembly for limiting the position of the circuit board and a flexible cushion layer, the flexible cushion layer is located below the clamping assembly, and the distance between the flexible cushion layer and the clamping assembly is adjustable. The device has the effect of improving the efficiency of small-batch maintenance, welding and circuit board disassembly of workers.

Description

Technical Field

[0001] The present application relates to the field of circuit board repair technology, and in particular to a bracket for fixing a circuit board. Background Art

[0002] As an important component of electronic products, circuit boards tend to be miniaturized, lightweight, and highly integrated along with the development of electronic products. Miniaturized circuit boards also make their production and maintenance more and more sophisticated. Usually, for small-batch production and maintenance of circuit boards, workers need to operate on the circuit boards one by one, so circuit board brackets are needed to limit the circuit boards to facilitate the work of the workers.

[0003] The circuit board bracket in the prior art cannot limit the position of components when welding or disassembling components, which not only causes the welded components to be lost, but also requires the position of components to be constantly adjusted during the welding process, resulting in low welding efficiency. Therefore, there is room for further improvement. Utility Model Content

[0004] In view of this, the present application provides a bracket for fixing circuit boards, which enables workers to conveniently limit the components on the circuit boards during small-batch production or repair of circuit boards, thereby improving the efficiency of workers in small-batch repair, welding, and disassembly of circuit boards.

[0005] In order to improve the efficiency of workers in repairing, welding, and disassembling circuit boards in small batches, the present application provides a bracket for fixing circuit boards.

[0006] The present application provides a bracket for fixing a circuit board using the following technical solution:

[0007] A bracket for fixing a circuit board, characterized in that it includes a clamping component and a flexible pad layer for limiting the position of the circuit board, the flexible pad layer is located below the clamping component, and the distance between the flexible pad layer and the clamping component is adjustable.

[0008] By adopting the above technical solution, first, the staff fixes the bracket for fixing the circuit board on the reversible welding rack, so that the bracket for fixing the circuit board can be easily reversed up and down. Secondly, the staff fixes the circuit board that has been plugged with components but soldered on the clamping assembly, so that the side of the circuit board with unfixed components is located on the upper side of the circuit board to prevent the components from falling off. Finally, the staff moves and presses the flexible pad to fix it on the end of the circuit board where the components are installed. After that, the staff reverses the circuit board so that the component end face of the circuit board is located at the lower end. At the same time, the flexible pad is also located below the component end face of the circuit board, so that the staff can operate on the non-component end of the circuit board. The flexible pad quickly limits the components on the circuit board on the one hand, and protects the components from damage on the other hand. When repairing the circuit board, similarly, the components on the circuit board are limited by the flexible pad, and then repair and replacement operations are performed, thereby improving the efficiency of the staff in small-batch repair, welding, and disassembly of the circuit board.

[0009] Preferably, it further comprises a supporting leg, wherein the supporting leg is connected to the clamping assembly, and the flexible pad is connected to the supporting leg, so that the flexible pad can move on the supporting leg.

[0010] By adopting the above technical solution, the flexible pad layer can quickly adjust the distance between itself and the clamping assembly through the supporting legs.

[0011] Preferably, it further comprises a bottom plate, wherein the bottom plate is connected to the supporting legs, and the flexible pad is connected to the bottom plate.

[0012] By adopting the above technical solution, the soft material of the flexible pad itself is sometimes not advantageous enough during the sliding connection with the legs. The special sliding connection base plate is helpful to improve the rate of change of the distance between the flexible pad and the circuit board.

[0013] Preferably, an oblong concave hole is provided on one side of the base plate, and a groove is provided on the other side of the base plate, and the base plate is connected to the supporting legs through the oblong concave hole and the groove.

[0014] By adopting the above technical solution, when the user needs to install the flexible pad on the leg, first clamp the oblong concave hole of the bottom plate on the other side of the leg, and then clamp the bottom plate through the groove, so that the bottom plate can be quickly and stably limited on the leg.

[0015] Preferably, the supporting leg is rotatably connected to the clamping assembly.

[0016] By adopting the above technical solution, the user rotates one leg to clamp the oblong recess of the base plate on the other leg, and then clamps the groove of the base plate by rotating the leg back, so that the base plate is quickly and stably limited on the leg.

[0017] Preferably, a locking nut is provided on the supporting leg, and the locking nut cooperates with the supporting leg.

[0018] By adopting the above technical solution, not only is it convenient to clamp the base plate on the support legs, but the distance between the base plate and the clamping assembly can also be stably and finely adjusted through the locking nut.

[0019] Preferably, the clamping assembly includes a clamping member and a sliding member, the clamping member is provided with a limiting groove for limiting the circuit board, the clamping member includes a first clamping member, a second clamping member and a third clamping member, the sliding member includes a first sliding member and a second sliding member, the first clamping member is arranged opposite to the second clamping member, the first sliding member is arranged opposite to the second sliding member, the clamping member is connected to the sliding member, so that the clamping assembly is rectangular, one end of the third clamping member is slidably connected to the first sliding member, and the other end is slidably connected to the second sliding member.

[0020] By adopting the above technical solution, the staff first fixes one end of the circuit board in the limiting groove of the first clamping member or the third clamping member, and limits the other end of the circuit board by sliding the third clamping member, thereby realizing the limitation of the bracket for fixing the circuit board for limiting plates of different sizes, so that the third clamping member can be used to achieve stable limitation of the circuit board, which can effectively limit the movement of the circuit board without damaging the circuit board. After the circuit board with components plugged in is clamped and fixed, the staff moves and presses the flexible pad to fix it on one end of the circuit board where the components are installed. In this way, the bracket for fixing the circuit board allows the staff to conveniently limit circuit boards of different sizes during the process of small-batch production or maintenance of circuit boards, without causing extrusion marks on the circuit boards, and can also effectively and safely limit the position of components to be soldered, thereby improving the efficiency of the staff in small-batch production of circuit boards of different sizes or maintenance of circuit boards of different sizes.

[0021] Preferably, a sliding groove is provided on the sliding member, a slider is provided in the sliding groove, a "U"-shaped block is provided at the end of the third clamping member, the "U"-shaped block is connected to the sliding member, and the "U"-shaped block is also connected to the slider.

[0022] By adopting the above technical solution, the third clamping member and the sliding member slide through the slider and the sliding groove, and the two ends of the third clamping member are limited between the two sliding members by the "U"-shaped block, so that the third clamping member slides through the "U"-shaped block and the sliding member, making the sliding of the third clamping member more stable.

[0023] Preferably, a locking mechanism is provided on the slider, and the locking mechanism can limit the position of the slider in the slide groove.

[0024] By adopting the above technical solution, the position of the third clamping member is limited by the locking mechanism, thereby stably limiting the position of the circuit board.

[0025] Preferably, a through hole is provided on the slider, and a step block groove is also provided on the slider below the through hole. The locking mechanism is at least partially located in the through hole and the step block groove, and a spring is also provided in the step block groove. One end of the spring abuts against the locking mechanism, and the other end abuts against the inner wall of the step block groove, so that the slider can also move to a limited extent through the spring after being locked by the locking mechanism.

[0026] By adopting the above technical solution, when the slider is locked by the locking mechanism, the slider can still move to a limited extent through the spring. Therefore, when the circuit board needs to be removed from between the clamping members, the user can quickly remove the circuit board by squeezing the spring through the third clamping member, which makes it easier for the user to remove the circuit board. This feature can also be used to quickly install the circuit board.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. First, the staff fixes the bracket for fixing the circuit board on the reversible welding rack, so that the bracket for fixing the circuit board can be easily reversed up and down. Secondly, the staff fixes the circuit board that has been plugged with components but soldered on the clamping assembly, so that the side of the circuit board with unfixed components is located on the upper side of the circuit board to prevent the components from falling off. Finally, the staff moves and presses the flexible pad to fix it on the end of the circuit board where the components are installed. After that, the staff reverses the circuit board so that the component end face of the circuit board is located at the lower end. At the same time, the flexible pad is also located below the component end face of the circuit board, so that the staff can operate on the non-component end of the circuit board. The flexible pad can quickly limit the components on the circuit board on the one hand and protect the components from damage on the other hand. When repairing the circuit board, similarly, the components on the circuit board are limited by the flexible pad, and then repair and replacement operations are performed, thereby improving the efficiency of staff in small-batch repair, welding, and disassembly of circuit boards.

[0029] 2. The user rotates one leg to fit the oblong recess of the base plate onto the other leg, and then rotates the leg back to fit the recess of the base plate, allowing the base plate to be quickly and stably positioned on the leg.

[0030] 3. The staff first fixes one end of the circuit board in the limiting groove of the first clamping member or the third clamping member, and limits the other end of the circuit board by sliding the third clamping member, so as to realize the limiting of the bracket for fixing the circuit board for limiting plates of different sizes, so that the third clamping member can be used to achieve stable limiting of the circuit board by sliding, which can effectively limit the movement of the circuit board without damaging the circuit board. After the circuit board with components inserted is clamped and fixed, the staff moves and presses the flexible pad to fix it on one end of the circuit board where the components are installed. In this way, the bracket for fixing the circuit board allows the staff to conveniently limit the circuit boards of different sizes during the process of small-batch production or maintenance of circuit boards, without causing squeezing marks on the circuit boards, and can also effectively and safely limit the positions of components to be soldered, thereby improving the efficiency of the staff in small-batch production of circuit boards of different sizes or maintenance of circuit boards of different sizes;

[0031] 4. After the slider is locked by the locking mechanism, the slider can still move to a limited extent through the spring. When the circuit board needs to be removed from between the clamping members, the user can quickly remove the circuit board by squeezing the spring through the third clamping member, making it easier for the user to remove the circuit board. This feature can also be used to quickly install the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the circuit board and the bracket for fixing the circuit board in this embodiment;

[0033] Figure 2 This is a partial structural diagram of a bracket for fixing a circuit board in this embodiment;

[0034] Figure 3 In this embodiment Figure 2 The cross-sectional view along line AA is shown;

[0035] Figure 4 This is a partial structural diagram of a bracket for fixing a circuit board in this embodiment;

[0036] Figure 5 is a top view of a bracket for fixing a circuit board in this embodiment;

[0037] Figure 6 In this embodiment Figure 5 The cross-sectional view along line BB is shown;

[0038] Figure 7 In this embodiment Figure 5 The cross-sectional view along line CC is shown;

[0039] Figure 8 Schematic diagram of the structure of the base plate in this embodiment.

[0040] Figure numerals: 1. Clamping assembly; 2. Flexible pad; 3. Clamping member; 4. First clamping member; 5. Second clamping member; 6. Third clamping member; 7. Sliding member; 8. First sliding member; 9. Second sliding member; 10. "U"-shaped block; 11. Slide groove; 12. Slider; 13. Locking mechanism; 14. Through hole; 15. Step block; 16. Small ball; 17. Connecting member; 18. Leg; 19. Base plate; 20. Connecting block; 21. Limiting groove; 22. Spring; 23. Step block groove; 24. Oblong concave hole; 25. Groove; 26. Locking nut; 27. Limiting plate; 28. Foot pad; 29. ​​Bracket connector. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-8 This application is described in further detail.

[0042] An embodiment of the present application discloses a bracket for fixing a circuit board.

[0043] Reference Figures 1-8 , including a clamping component 1 for limiting the position of the circuit board, a flexible pad 2 and a support leg 18, the support leg 18 is connected to the clamping component 1, the support leg 18 is movably connected to the flexible pad 2, and the flexible pad 2 is located below the clamping component 1.

[0044] The clamping assembly 1 includes three clamping members 3 and two sliding members 7. The clamping member 3 is provided with a limiting groove 21 for limiting the circuit board, and the clamping member 3 and the sliding member 7 are located in the same plane. The clamping member 3 includes a first clamping member 4, a second clamping member 5 and a third clamping member 6. The sliding member 7 includes a first sliding member 8 and a second sliding member 9. The first clamping member 4 is arranged opposite to the second clamping member 5, and the first sliding member 8 is arranged opposite to the second sliding member 9, so that one end of the first clamping member 4 is bolted to the first sliding member 8, and the other end is bolted to the second The sliding member 9 is bolted, one end of the first clamping member 4 is bolted to the other end of the first sliding member 8, and the other end is bolted to the other end of the second sliding member 9. The first clamping member 4, the second clamping member 5, the first sliding member 8 and the second sliding member 9 form a rectangle, one end of the third clamping member 6 is slidingly connected to the first sliding member 8, and the other end is slidingly connected to the second sliding member 9, so that the third clamping member 6 is located between the first clamping member 4 and the second clamping member 5, and the third clamping member 6 can slide between the first clamping member 4 and the second clamping member 5.

[0045] When it is necessary to produce circuit boards in small batches, the staff will fix the bracket for fixing the circuit boards on a flippable welding rack so that the bracket for fixing the circuit boards can be easily turned upside down. Then, the circuit board that has been plugged with components but not soldered is fixed between the clamps 3. One end of the circuit board can be fixed in the limiting groove 21 of the first clamp 4 or the third clamp 6 first, and the limiting groove 21 of the third clamp 6 can be limited by sliding the third clamp 6 to limit the other end of the circuit board, thereby realizing the limitation of the bracket for fixing the circuit board for limiting plates of different sizes, so that the circuit board can be stably limited by sliding the third clamp 6, which can effectively limit the movement of the circuit board without damaging the circuit board. After the circuit board that has been plugged with components is clamped and fixed, the staff moves and presses the flexible pad 2 to fix it on the circuit board installation component. The flexible pad 2 can be placed on one end of the circuit board and reversed between the circuit boards so that the component end face of the circuit board is located at the lower end. At the same time, the flexible pad 2 is also located below the component end face of the circuit board, so that the staff can operate on the non-component end of the circuit board. The flexible pad 2 can quickly limit the components on the circuit board on the one hand and protect the components from damage on the other hand. After the installation is completed, the user removes the circuit board. The flexible pad can also prevent the components on the circuit board from falling, protecting the components of the circuit board. The components can be quickly retrieved for easy reinstallation. When the circuit board needs to be repaired, the user fixes the circuit board between the clamping parts 3 and uses the flexible pad to limit or protect the components that have been installed or are being installed. After the installation or removal is completed, the user removes the circuit board. The flexible pad can also prevent the components on the circuit board from falling, protecting the components of the circuit board.

[0046] Furthermore, in this embodiment, "U"-shaped blocks 10 are sleeved on both ends of the third clamping member 6, and the two "U"-shaped blocks 10 are respectively bitten on the first sliding member 8 and the second sliding member 9 through the opened "U" mouth. The "U"-shaped blocks 10 cooperate with the surface of the sliding member 7, and the inner wall of the "U"-shaped block 10 and the surface of the sliding member 7 are subjected to surface engineering treatment, so that the third clamping member 6 can be easily slid on the sliding member 7 through the "U"-shaped block 10.

[0047] Furthermore, in this embodiment, a slide groove 11 is provided at the lower end of the sliding member 7, and the slide groove 11 is a stepped groove. The width of the upper part of the slide groove 11 is greater than the width of the lower part of the slide groove 11. A slider 12 is provided in the slide groove 11. The cross-section of the slider 12 is stepped. The width of the upper part of the slider 12 is greater than the width of the lower part of the slider 12, and the width of the lower end of the slide groove 11 is less than the width of the upper part of the slider 12, but greater than the width of the lower part of the slider 12, that is, the lower part of the slider 12 is located outside the slide groove 11, and the third clamping member 6 is bolted to the slider 12, so that the third clamping member 6 and the sliding member 7 are slidably connected to the slide groove 11 through the slider 12.

[0048] Furthermore, in this embodiment, a locking mechanism 13 is provided on the slider 12, and the locking mechanism 13 is used to limit the position of the slider 12 in the slide groove 11, and then limit the position of the third clamping member 6 on the sliding member 7, so that after the user fixes the circuit board between the clamping members 3, the position of the third clamping member 6 is fixed by the locking mechanism 13, and the circuit board is stably and permanently limited between the clamping members 3.

[0049] Furthermore, in this embodiment, the locking mechanism 13 includes a step block 15, a ball 16 and a connecting piece 17. A step block groove 23 is provided at the lower portion of the slider 12. The slider 12 is provided with a through hole 14 on the upper wall of the step block groove 23. The ball 16 is located in the through hole 14. The step block 15 is located in the step block groove 23. The width of the upper portion of the step block 15 is greater than the width of the lower portion of the step block 15, and the width of the upper portion of the step block 15 is greater than the width of the lower portion of the slide groove 11. The connecting piece 17 is threadedly connected to the step block 15 so that the connecting piece 17 and the ball 16 are located on the same axis. The user locks or unlocks the connection between the slider 12 and the slider 7 by rotating the connecting piece 17. When the user needs to lock the position of the slider 12, the user rotates The connecting piece 17 and the step block 15 have an increased connection tightness, and the connecting piece 17 continuously rotates toward the top of the step block 15. After a period of time, the upper end of the connecting piece 17 squeezes the ball 16, the ball 16 squeezes the slider 12, and the slider 12 squeezes the upper end of the inner wall of the slide groove 11 of the sliding piece 7, thereby increasing the pressure between the slider 12 and the slide groove 11, thereby limiting the position of the slider 12 in the slide groove 11; when the user needs to unlock the position of the slider 12, the user rotates the connecting piece 17 in the opposite direction, and the connecting piece 17 rotates downward relative to the step block 15, and the ball 16 gradually reduces the squeezing of the slider 12, and the slider 12 gradually reduces the squeezing of the inner wall of the slide groove 11, thereby reducing the friction between the slider 12 and the slide groove 11.

[0050] Furthermore, in this embodiment, a spring 22 is provided between the slider 12 and the step block 15. The spring has a pre-tightening force, so that after the user fixes the position of the third clamping member 6 through the locking mechanism 13, the spring 22 between the slider 12 and the step block 15 also allows the slider 12 to move to a limited extent, thereby allowing the user to quickly disassemble the circuit board by compressing the spring 22 through the slider 12.

[0051] Furthermore, in this embodiment, connecting holes are provided at both ends of the clamping member 3 and the sliding member 7. When the clamping member 3 and the sliding member 7 are fixedly connected, connecting blocks 20 are provided at the ends of the clamping member 3 and the sliding member 7. The side wall of the connecting block 20 is provided with a connecting groove in the shape of a right triangle. The clamping member 3 and the sliding member 7 are partially overlapped and vertically placed in the connecting groove. A bolt member is axially installed on the connecting block 20; preferably, the bottom end of the connecting block 20 is flat so that the connecting block 20 can be directly used as a support leg 18.

[0052] Furthermore, in this embodiment, the side wall of the connecting block 20 is integrally connected to a rotating shaft, and a support leg 18 is sleeved on the rotating shaft, so that the support leg 18 can rotate on the rotating shaft. A limiting plate 27 is also sleeved on the rotating shaft, and a screw is threadedly connected to the axis of the rotating shaft, so that the user can adjust the difficulty of rotating the support leg 18 and the rotating shaft by the tightness of the connection between the screw and the rotating shaft. When the user needs to install a flexible pad, the user rotates the support leg 18 to clamp the flexible pad between the support legs 18, thereby achieving the installation of the flexible pad and the support leg 18.

[0053] Furthermore, in this embodiment, a bottom plate 19 is provided on the flexible pad layer 2, and a protrusion is provided on the bottom plate 19 for limiting the flexible pad. The bottom plate 19 is also provided with a grid through hole 14 for reducing the overall weight of the bottom plate 19. An oblong recessed hole 24 is provided on one side of the bottom plate 19, and a groove 25 is provided on the other side. When the user needs to install the flexible pad on the leg 18, the user rotates one side of the leg 18, clamps the oblong recessed hole 24 of the bottom plate 19 on the other side of the leg 18, and clamps the groove 25 of the bottom plate 19 by rotating the leg 18, so that the bottom plate 19 is quickly and stably limited on the leg 18.

[0054] Furthermore, in this embodiment, a thread is provided on the surface of the support leg 18, and a locking nut 26 is threadedly connected to the support leg 18. The user squeezes the base plate 19 by rotating the locking nut 26. The locking nut 26 can cause the base plate 19 to perform precise small-scale displacement, stably and precisely changing the distance between the base plate 19 and the clamping assembly 1, so as to change the distance between the flexible pad and the clamping assembly 1.

[0055] Furthermore, in this embodiment, a foot pad 28 is connected to the lower end of the support leg 18. The foot pad 28 can buffer the friction between the support leg 18 and the work platform, protect the work platform, and reduce working noise. Moreover, since the foot pad 28 has a certain deformation ability, it is beneficial to increase the probability of the support leg 18 stably supporting the circuit board and increase the stability of the support leg 18 supporting the circuit board.

[0056] Furthermore, in this embodiment, the material of the flexible pad layer 2 is elastic, which effectively increases the extrusion tightness between the flexible pad layer 2 and the end faces of the circuit board components and protects the components on the circuit board.

[0057] Furthermore, in this embodiment, a bracket connector 29 is provided on the surface of the sliding member 7, and the bracket connector 29 is used to connect with the flippable welding frame. A protrusion is integrally connected to the bracket connector 29 to facilitate the clamping connection between the bracket connector 29 and the flippable welding frame.

[0058] Furthermore, in this embodiment, the material of the bracket connector 29 has excellent friction properties and a certain elastic deformation capability.

[0059] Furthermore, in this embodiment, the present invention has no special restrictions on the movable connection between the flexible pad 2 and the support leg 18. A common sliding or moving structure that is familiar to those skilled in the art and can change the distance between the flexible pad 2 and the clamping assembly 1 can be used. Those skilled in the art can make adjustments in various aspects according to specific needs; preferably, the flexible pad 2 can be sleeved on the support leg 18, and the elastic deformation of the flexible pad 2 is used to maintain a tight connection between the support leg 18 and the flexible pad 2; preferably, after the flexible pad 2 is sleeved on the support foot, the position of the flexible pad is fine-tuned by tightening the nut 26.

[0060] The present invention has no special restrictions on the relative arrangement of the first clamping member 4 and the second clamping member 5, and has no special restrictions on the specific sliding structure of the third clamping member 6 between the first clamping member 4 and the second clamping member 5. It is sufficient to use the functions that are well known to those skilled in the art to achieve the relative arrangement of the first clamping member 4 and the second clamping member 5 and the sliding of the third clamping member 6 between the first clamping member 4 and the second clamping member 5.

[0061] The present invention has no special restrictions on the specific structure of the distance change between the flexible pad layer 2 and the clamping component 1. Any structure that is familiar to those skilled in the art and can realize the function of changing the distance between the flexible pad layer 2 and the clamping component 1 can be used. Those skilled in the art can make adjustments in various aspects according to specific needs; preferably, the flexible pad layer 2 and the clamping component 1 realize the distance change between the flexible pad layer 2 and the clamping component 1 through the above-mentioned support legs 18.

[0062] It should be noted that the various embodiments of the present application can be arbitrarily combined into new embodiments if the solutions do not conflict and the technical solutions can coexist.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bracket for fixing a circuit board, characterized in that: The invention comprises a clamping component (1) for defining the position of a circuit board and a flexible pad (2), wherein the flexible pad (2) is located below the clamping component (1), and the distance between the flexible pad (2) and the clamping component (1) is adjustable.

2. The bracket according to claim 1, characterized in that: It also includes a support leg (18), the support leg (18) is connected to the clamping assembly (1), and the flexible pad (2) is connected to the support leg (18), so that the flexible pad (2) can move on the support leg (18).

3. The bracket according to claim 2, characterized in that: It also includes a bottom plate (19), the bottom plate (19) is connected to the supporting legs (18), and the flexible cushion layer (2) is connected to the bottom plate (19).

4. The bracket according to claim 3, characterized in that: An oblong concave hole (24) is provided on one side of the bottom plate (19), and a groove (25) is provided on the other side of the bottom plate (19). The bottom plate (19) is connected to the supporting leg (18) via the oblong concave hole (24) and the groove (25).

5. The bracket according to claim 4, characterized in that: The supporting leg (18) is rotatably connected to the clamping assembly (1).

6. The bracket according to claim 2 or 5, characterized in that: The supporting leg (18) is provided with a locking nut (26), and the locking nut (26) cooperates with the supporting leg (18).

7. The bracket according to claim 2, characterized in that: The clamping assembly (1) includes a clamping member (3) and a sliding member (7). The clamping member (3) is provided with a limiting groove (21) for limiting the circuit board. The clamping member (3) includes a first clamping member (4), a second clamping member (5) and a third clamping member (6). The sliding member (7) includes a first sliding member (8) and a second sliding member (9). The first clamping member (4) and the second clamping member (5) are arranged opposite to each other, and the first sliding member (8) and the second sliding member (9) are arranged opposite to each other. The clamping member (3) and the sliding member (7) are connected, so that the clamping assembly (1) is rectangular. One end of the third clamping member (6) is slidably connected to the first sliding member (8), and the other end is slidably connected to the second sliding member (9).

8. The bracket according to claim 7, characterized in that: The sliding member (7) is provided with a sliding groove (11), and a sliding block (12) is provided in the sliding groove (11). The end of the third clamping member (6) is provided with a "U"-shaped block (10), and the "U"-shaped block (10) is connected to the sliding member (7), and the "U"-shaped block (10) is also connected to the sliding block (12).

9. The bracket according to claim 8, characterized in that: The slider (12) is provided with a locking mechanism (13), and the locking mechanism (13) can limit the position of the slider (12) in the slide groove (11).

10. The bracket according to claim 9, characterized in that: The slider (12) is provided with a through hole (14), and the slider (12) is further provided with a step block groove (23) at the lower part of the through hole (14). The locking mechanism (13) is at least partially located in the through hole (14) and the step block groove (23), and a spring (22) is further provided in the step block groove (23). One end of the spring (22) abuts against the locking mechanism (13), and the other end abuts against the inner wall of the step block groove (23), so that the slider (12) can also move to a limited extent through the spring (22) after being locked by the locking mechanism (13).

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