Board card fixing device and case

Abstract

The utility model discloses a board card fixing device and a case. The board card fixing device comprises a connecting plate and a supporting plate, the connecting plate extends along a first direction and is suitable for being fixed at one end of the board card; pulling assisting devices are hinged to the two ends of the connecting plate; the pulling assisting device extends in the first direction, and a clamping part is arranged on the connecting plate. The two supporting plates are suitable for being arranged on a to-be-installed surface at intervals. A sliding groove and a stop groove are formed in the inner side of the supporting plate. The sliding groove extends in the second direction and is suitable for being matched with the board card. The first direction is perpendicular to the second direction; a V-shaped elastic sheet is arranged in the stop groove; the head portion of the pulling assisting device is suitable for being detachably connected with the clamping portion when the board card is inserted between the two supporting plates, so that the tail portion of the pulling assisting device is arranged in the stopping groove and abuts against the V-shaped elastic piece in a matched mode. According to the utility model, the V-shaped elastic sheet provides elastic support for the board card in the first direction, so that the installation between the device and the board card is firmer, the vibration is effectively reduced, the supporting performance is stronger, the practicability is strong, and the stability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of board carrier technology, specifically to a board fixing device and chassis. Background Technology

[0002] With the development of electronic technology, experimental debugging has become commonplace. Multiple circuit boards are typically required during experiments. For ease of debugging and transport, these boards are usually installed within a computer case.

[0003] Chinese patent document CN207783382U discloses a circuit board fixing chassis. The chassis includes a box body formed by a bottom plate, front side plate, rear side plate, left side plate, right side plate, and top plate. A fixing assembly (i.e., circuit board fixing device) for positioning and fixing circuit boards is provided inside the box. The fixing assembly includes multiple upper insulating fixing rods and multiple lower insulating fixing rods arranged parallel to each other in the horizontal direction. Each upper insulating fixing rod corresponds to one lower insulating fixing rod. A first fixing groove is formed on the lower end face of each upper insulating fixing rod. A second fixing groove is formed on the upper end face of each lower insulating fixing rod corresponding to the first fixing groove. When installing a circuit board, the upper end of the board is inserted into the first fixing groove, and the lower end is inserted into the second fixing groove.

[0004] The aforementioned circuit board mounting chassis uses rubber feet on the bottom of the base plate for vibration damping. However, these rubber feet only reduce vibration impact between the chassis and the support, but cannot specifically mitigate vibration impact between the mounting components and each circuit board. Furthermore, there is no vibration damping structure between the mounting components and the circuit boards; that is, the mounting components do not provide any elastic support to the circuit boards in the vertical direction. Therefore, when this circuit board mounting chassis is used in a high-vibration environment, relying solely on the mounting components to hold the circuit boards carries a risk of failure, and may even lead to unexpected sliding, swaying, or vibration of the circuit boards. Utility Model Content

[0005] This utility model proposes a board fixing device and chassis to solve the technical problem that existing board fixing devices cannot provide elastic support for the board and have low reliability.

[0006] On the one hand, this utility model discloses a plate fixing device, including a connecting plate and a supporting plate;

[0007] The connecting plate extends along a first direction and is adapted to be fixed to one end of the plate; both ends of the connecting plate are hinged with pull-out aids; the pull-out aids extend along the first direction, and the connecting plate is provided with a snap-fit ​​part that is detachably connected to the head of the pull-out aid;

[0008] The support plates are two in number and are suitable for being spaced apart on the surface to be installed; the inner side of the support plates is provided with a sliding groove and a stop groove; the sliding groove extends along the second direction and is suitable for cooperating with the plate; the first direction is perpendicular to the second direction; the stop groove is provided with a V-shaped spring piece;

[0009] The head of the pull-out aid is adapted to connect with the snap-fit ​​portion when the plate is inserted between the two support plates, so that the tail of the pull-out aid is placed in the corresponding stop groove, and the pull-out aid abuts against the V-shaped spring. By setting the V-shaped spring in the stop groove, the V-shaped spring provides elastic support to the plate in the first direction, making the installation between the device and the plate more secure, achieving a vibration reduction effect, stronger support, greater practicality, and improved device reliability.

[0010] Furthermore, the support plate is provided with a spring plate mounting groove; the spring plate mounting groove extends along a third direction and penetrates the support plate; the third direction is perpendicular to the first direction and the second direction respectively; the spring plate mounting groove is connected to the stop groove;

[0011] The V-shaped spring includes a first piece and a second piece connected together; the first piece is disposed in the spring mounting groove and extends into the stop groove; the first piece is fixed to the support plate by bolts.

[0012] The second piece is placed in the stop groove and is adapted to abut against the tail of the puller to limit the displacement of the connecting plate in the first direction;

[0013] The stop groove is adapted to limit the displacement of the tail of the connecting plate in the second direction when the tail of the puller is placed in the corresponding stop groove. Using the above solution, the cooperation between the puller and the stop groove effectively limits the displacement of the plate in the second direction; the cooperation between the puller and the V-shaped spring effectively limits the displacement of the plate in the first direction.

[0014] Furthermore, the pull-out aid includes a connecting body and a hook;

[0015] The connecting body extends along a first direction, with its middle portion hinged to the end of the connecting plate; the tail portion of the connecting body is adapted to be placed in the corresponding stop groove and abuts against the V-shaped spring piece.

[0016] The hook is hinged to the head of the connecting body, and the hook is adapted to be detachably connected to the locking part. This solution achieves a detachable connection between the puller and the locking part.

[0017] Furthermore, an arc-shaped spring piece is provided between the connecting body and the hook;

[0018] The arc-shaped spring is adapted to elastically support the hook when it is connected to the locking part. This design prevents the hook from rotating unexpectedly, thereby preventing it from accidentally disengaging from the locking part.

[0019] Furthermore, the support plate is provided with an extension portion, which is adapted to be connected to the surface to be installed via bolts. This design ensures a secure connection between the support plate, which is located on the top wall of the inner cavity of the enclosure, and the enclosure itself.

[0020] Furthermore, a connector is provided on one side of the board and is located at one end of the board;

[0021] The connecting plate is provided with a reinforcing portion; the connecting plate is adapted to be disposed opposite to the connector at both ends of the board and on the same side as the connector; the reinforcing portion is distributed between the connector and the pull-out aid. Using the above solution, the reinforcing portion can effectively increase the rigidity of the board and prevent damage to the board structure during the removal process.

[0022] Furthermore, the plate fixing device also includes a locking strip fixed on the plate, the locking strip being adapted to be positioned between the slide groove and the plate, so that the plate and the inner wall of the slide groove are in an interference fit. Using the above solution, the interference fit between the plate and the slide groove effectively restricts the displacement of the plate in the third direction.

[0023] On the other hand, this utility model also discloses a board fixing chassis, including a chassis body and the board fixing device;

[0024] The box body is a hollow cavity with an opening at the front end;

[0025] The two support plates of the plate fixing device are disposed opposite to each other on the top and bottom walls of the inner cavity of the box.

[0026] The stop grooves of the support plate are distributed at the open end of the housing. Using the above scheme, the card-fixed housing allows for quick assembly and disassembly of the circuit boards, ensuring good installation tightness, high reliability, and convenient assembly and disassembly.

[0027] Furthermore, several circuit board fixing devices are provided, spaced apart within the housing. This design effectively secures several circuit boards within the housing.

[0028] Furthermore, the housing is provided with clearance holes; these clearance holes are positioned opposite to the bolts used to fix the V-shaped spring clips. Using this design, the clearance holes can effectively avoid the corresponding bolts.

[0029] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0030] By setting a V-shaped spring in the stop groove, the V-shaped spring provides elastic support to the board in the first direction, making the installation between the device and the board more secure, achieving the effect of vibration reduction, stronger support, and greater practicality.

[0031] The engagement of the puller and the stop groove effectively limits the displacement of the plate in the second direction. The engagement of the puller and the V-shaped spring effectively limits the displacement of the plate in the first direction.

[0032] The interference fit between the circuit board and the slide rail effectively restricts the displacement of the circuit board in the third direction.

[0033] The circuit board mounting chassis allows for quick assembly and disassembly of circuit boards, ensuring good installation tightness, high reliability, and convenient assembly and disassembly operations.

[0034] The above description of the disclosed content and the following description of the embodiments are intended to demonstrate and explain the spirit and principle of the present invention, and to provide a further explanation of the scope of the patent application of the present invention. Attached Figure Description

[0035] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the board insertion and fixing device in this utility model;

[0037] Figure 2 This is a schematic diagram of the plate card being fixed on the plate card fixing device in this utility model;

[0038] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 This is a three-dimensional structural diagram of the plate card being fixed on the plate card fixing device in this utility model;

[0040] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0041] Figure 6 This is a schematic diagram of the board card being inserted into the chassis of this utility model.

[0042] Explanation of icon numbers:

[0043] 1. Connecting plate; 11. Snap-fit ​​part; 12. Reinforcing part; 2. Pull-out aid; 21. Connecting body; 22. Hook; 23. Arc-shaped spring; 3. Support plate; 31. Slide groove; 32. Stop groove; 33. Spring mounting groove; 34. Extension part; 4. V-shaped spring; 5. Locking strip; 6. Housing; 61. Clearance hole; 7. Board; 8. Connector. Detailed Implementation

[0044] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0045] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the utility model.

[0046] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0047] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0048] On one hand, this application discloses a board fixing device. In this embodiment, please refer to... Figure 6 As shown, the board fixing device is adapted to be installed in the inner cavity of the housing 6 to detachably install the board 7 inside the housing 6.

[0049] Please see Figures 1-5As shown, the plate fixing device includes a connecting plate 1, a pull-out aid 2, a support plate 3, and a V-shaped spring 4. The connecting plate 1 extends along a first direction and is suitable for fixing to one end of the plate 7. Two pull-out aids 2 are symmetrically arranged at both ends of the connecting plate 1 and are hinged to it respectively. The pull-out aids 2 extend along the first direction. The connecting plate 1 has a snap-fit ​​part 11, which is detachably connected to the head of the pull-out aid 2. Two support plates 3 are used. The two support plates 3 are suitable for symmetrically spaced on the surface to be installed; that is, in this embodiment, the two support plates 3 are suitable for being spaced on two opposing inner walls of the housing 6 (e.g., ...). Figure 6 (As shown). A sliding groove 31 and a stop groove 32 are provided on the inner side of the support plate 3. The sliding groove 31 extends along a second direction. The first direction is perpendicular to the second direction. The sliding groove 31 is adapted to cooperate with the plate 7. A V-shaped spring piece 4 is provided in the stop groove 32. When the plate 7 is inserted between the two support plates 3, the head of the puller 2 is adapted to connect with the locking part 11, so that the tail of the puller 2 is placed in the corresponding stop groove 32, and the tail of the puller 2 abuts against the V-shaped spring piece 4. The V-shaped spring piece 4 is adapted to limit the puller 2 in the first direction. The upper and lower ends of the connecting plate 1 abut against the corresponding V-shaped spring piece 4 through the puller 2. The V-shaped spring piece 4 can effectively limit the displacement of the connecting plate 1 in the first direction, that is, the V-shaped spring piece 4 can effectively limit the displacement of the plate 7 in the first direction.

[0050] In this embodiment, the housing 6 is a hollow cavity with an open front end. The board fixing device is adapted to hold the board 7 upright inside the housing 6. The first direction is the vertical direction. The second direction is the front-to-back direction. The connecting plate 1 extends in the vertical direction. The board 7 extends in the front-to-back direction. A connector 8 is provided on one side of the board 7. The connector 8 is located at one end of the board 7, and the connecting plate 1 is adapted to be positioned opposite to the connector 8 at both ends of the board 7.

[0051] Specifically, the connecting plate 1 is suitable for fixing to the front end of the board 7, and the connector 8 is fixed to the rear end of the board 7. The pull-out aid 2 extends vertically and is distributed on the front side of the connecting plate 1. The support plate 3 extends in the front-back direction, the slide groove 31 extends in the front-back direction, and the stop groove 32 is provided in front of the slide groove 31. The two support plates 3 are disposed opposite to each other on the top and bottom walls of the inner cavity of the housing 6. The slide grooves 31 of the two support plates 3 are respectively adapted to mate with the upper and lower edges of the board 7.

[0052] After the upper and lower edges of the card 7 are fully inserted into the corresponding slots 31, the operator can rotate the head of the puller 2 to connect it with the locking part 11. After the head of the puller 2 is connected to the locking part 11, the tail of the puller 2 will be placed in the stop groove 32, and the tail of the puller 2 will abut against the V-shaped spring 4 to limit the vertical displacement of the card 7. The V-shaped spring 4 provides elastic support to the card 7 in the vertical direction, thereby achieving the effect of vibration reduction.

[0053] In this embodiment, the material of the V-shaped spring 4 includes, but is not limited to, high-toughness materials such as stainless steel, carbon steel, and copper alloy.

[0054] Please see Figures 2-5 As shown, to reduce the difficulty of installing the V-shaped spring 4, a spring mounting groove 33 is provided on the support plate 3. The spring mounting groove 33 extends along a third direction and penetrates the support plate 3. The third direction is perpendicular to the first and second directions respectively. In this embodiment, the third direction is the left-right direction. The spring mounting groove 33 is connected to the stop groove 32. The V-shaped spring 4 includes a first piece and a second piece connected together. The first piece is disposed in the spring mounting groove 33 and extends into the stop groove 32. The first piece can be fixed to the spring mounting groove 33 by screws or welding. In this embodiment, the first piece is fixed to the support plate 3 by bolts. The second piece is placed in the stop groove 32 and is suitable for abutting against the tail of the puller 2. The second piece is used to limit the displacement of the connecting plate 1 in the vertical direction, that is, the second piece can effectively limit the displacement of the plate 7 in the vertical direction and provide elastic support to the plate 7 in the vertical direction, thereby achieving the effect of vibration reduction.

[0055] When the tail of the puller 2 is placed in the corresponding stop groove 32, the stop groove 32 is used to limit the displacement of the connecting plate 1 in the front-back direction, that is, the stop groove 32 can effectively limit the displacement of the plate 7 in the front-back direction.

[0056] When the V-shaped spring 4 needs to be replaced, separate the bolt from the V-shaped spring 4, and then push the V-shaped spring 4 out of the spring mounting slot 33 in the left-right direction. After that, push the new V-shaped spring 4 into the spring mounting slot 33 in the left-right direction, and then use the bolt to fix the new V-shaped spring 4 on the support plate 3.

[0057] In this embodiment, the pull-out aid 2 includes a connecting body 21 and a hook 22. The connecting body 21 extends vertically. The middle part of the connecting body 21 is hinged to the end of the connecting plate 1. The tail of the connecting body 21 is adapted to be placed in a corresponding stop groove 32 and abuts against the second piece of the V-shaped spring 4. The hook 22 is hinged to the head of the connecting body 21 and is adapted to be detachably connected to the locking part 11.

[0058] Preferably, the locking part 11 is a locking post, symmetrically arranged on the left and right sides of the connecting plate 1. The locking hook 22 is provided with a slot for avoiding the connecting plate 1, so that the same locking hook 22 can be detachably connected with the locking posts arranged on the left and right sides of the connecting plate 1, thereby effectively improving the stability of the device.

[0059] An arc-shaped spring piece 23 is provided between the connecting body 21 and the hook 22 to improve the stability of the device. When the hook 22 is connected to the locking part 11, the arc-shaped spring piece 23 can elastically support the hook 22 to prevent the hook 22 from rotating accidentally, thereby preventing the hook 22 from accidentally disengaging from the locking part 11.

[0060] Furthermore, to achieve a locking connection between board 7 and slide 31, please refer to... Figure 1 As shown, the board fixing device also includes a locking strip 5. In this embodiment, the board 7 includes a first surface and a second surface arranged opposite to each other. The connector 8 is disposed on the first surface of the board 7. The locking strip 5 is disposed on the second surface of the board 7 and extends in the front-back direction. There are two locking strips 5, respectively disposed near the upper and lower edges of the board 7. When the upper and lower edges of the board 7 are placed in the corresponding slide grooves 31, the locking strip 5 is disposed between the slide grooves 31 and the board 7. When the board 7 is completely placed in the slide grooves 31, the operator can adjust the locking strip 5 so that the side of the locking strip 5 away from the board 7 and the second surface of the board 7 are respectively in close contact with the inner walls of both sides of the slide groove 31, that is, the interference fit between the board 7 and the slide groove 31, thereby locking the board 7 and the slide groove 31 together.

[0061] The locking strip 5 is prior art. Chinese patent document CN214708390U describes a printed circuit board locking device. This document details how the printed circuit board is mounted onto the slot structure using a wedge-shaped locking strip. Therefore, the locking strip 5 is prior art and will not be elaborated upon in this application.

[0062] In this embodiment, the locking strip 5 is a SureLock series locking strip.

[0063] On the other hand, this application discloses a board mounting chassis.

[0064] Please see Figure 6 As shown, the card fixing chassis includes a housing 6 and a card fixing device. Specifically, the housing 6 is a hollow cavity with an open front end. Two support plates 3 of the card fixing device are disposed opposite to each other on the top and bottom walls of the cavity of the housing 6 and extend in the front-rear direction. The stop grooves 32 of the support plates 3 are distributed at the open end of the housing 6, and the pull-out aids 2 are distributed on the front side of the connecting plate 1. When the card is fully inserted into the slide groove 31, the pull-out aids 2 are distributed at the open end of the housing 6 so that the operator can rotate the pull-out aids 2 to detachably connect the card hook 22 with the card engaging part 11.

[0065] In this embodiment, the housing 6 is provided with a clearance hole 61. The clearance hole 61 is arranged opposite to the bolt used to fix the V-shaped spring 4, so that the clearance hole 61 can effectively avoid the corresponding bolt.

[0066] In this embodiment, to ensure a stable connection between the support plate 3, which is installed on the top wall of the inner cavity of the housing 6, and the housing 6, the support plate 3 is provided with an extension 34 (e.g., Figure 4 (As shown). The extension 34 is horizontally positioned and adapted to fit against the top wall of the inner cavity of the housing 6. The extension 34 is adapted to be connected to the surface to be installed (i.e., the top wall of the inner cavity of the housing 6) by bolts. The support plate 3 of the bottom wall of the inner cavity of the housing 6 is connected to the housing 6 by bolts.

[0067] Furthermore, there are several board fixing devices. Several board fixing devices are arranged at intervals in the left-right direction inside the housing 6 so that multiple boards 7 can be installed inside the board fixing housing.

[0068] Furthermore, to effectively protect the connector 8, the connecting plate 1 is disposed on the same side as the connector 8, and the connecting plate 1 is provided with a reinforcing part 12. In this embodiment, both the connecting plate 1 and the connector 8 are disposed on the first side of the board 7, and the reinforcing part 12 is distributed between the connector 8 and the pull-out aid 2. When the board 7 is effectively disposed in the board fixing housing through the cooperation of the tail of the connecting body 21 and the stop groove 32, the reinforcing part 12 is located in front of the connector 8, which can effectively increase the rigidity of the board 7 and prevent damage to the structure of the board 7 during the removal of the board 7. In addition, the reinforcing part 12 effectively separates the connector 8 from the front opening of the housing 6, thereby preventing the operator from accidentally touching the connector 8 through the front opening of the housing 6, thus effectively protecting the connector 8.

[0069] The assembly process for mounting the circuit board in the chassis is as follows:

[0070] The V-shaped spring 4 is installed in the spring mounting slot 33 by bolts; thereafter, the support plate 3 is fixed in the inner cavity of the box 6 by bolts.

[0071] The working principle of the circuit board fixing chassis is as follows;

[0072] When the board mounting chassis is idle, only the support plate 3 is fixedly installed inside the board mounting chassis.

[0073] When the board 7 needs to be installed in the board fixing box, connect the connecting plate 1 to the board and separate the hook 22 from the locking part 11. Then, insert the side-standing board 7 into the box 6. Specifically, insert the rear end of the board 7 into the box 6 through the front opening of the box 6 so that the upper and lower edges of the board 7 are respectively placed in the corresponding sliding grooves 31. After the board 7 is fully inserted into the sliding grooves 31, rotate the hook 22 to connect the hook 22 with the locking part 11; after the hook 22 is connected to the locking part 11, the tail of the puller 2 will be placed in the stop groove 32, and the tail of the connecting body 21 will abut against the V-shaped spring 4. Then, lock the board 7 to the sliding groove 31 with the locking strip 5, that is, at this time, the board 7 is interference-fitted with the sliding groove 31 by the locking strip 5.

[0074] In summary, this invention achieves vibration reduction by incorporating a V-shaped spring within the stop groove, which provides elastic support to the circuit board in the first direction. This results in a more secure installation between the device and the circuit board, enhancing support and practicality. The cooperation between the puller and the stop groove effectively limits the displacement of the circuit board in the second direction (front-to-back). The cooperation between the puller and the V-shaped spring effectively limits the displacement of the circuit board in the first direction (vertical). The interference fit between the circuit board and the slide groove effectively limits the displacement of the circuit board in the third direction (left-to-right). The circuit board mounting housing allows for quick assembly and disassembly of the circuit board, ensuring good installation security, high reliability, and convenient assembly / disassembly operations.

[0075] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A plate fixing device, characterized in that, Includes a connecting plate (1) and a support plate (3); The connecting plate (1) extends along the first direction and is suitable for fixing to one end of the plate (7); both ends of the connecting plate (1) are hinged with pull-out aids (2); the pull-out aids (2) extend along the first direction, and the connecting plate (1) is provided with a snap-fit ​​part (11) that is detachably connected to the head of the pull-out aids (2). There are two support plates (3), which are suitable for being spaced apart on the surface to be installed; the inner side of the support plate (3) is provided with a sliding groove (31) and a stop groove (32); the sliding groove (31) extends along the second direction and is suitable for cooperating with the plate (7); the first direction is perpendicular to the second direction; the stop groove (32) is provided with a V-shaped spring piece (4). The head of the puller (2) is adapted to connect with the snap-fit ​​part (11) when the plate (7) is inserted between the two support plates (3), so that the tail of the puller (2) is placed in the corresponding stop groove (32), and the puller (2) abuts against the V-shaped spring (4).

2. The plate fixing device according to claim 1, characterized in that, The support plate (3) is provided with a spring plate mounting groove (33); the spring plate mounting groove (33) extends along a third direction and penetrates the support plate (3); the third direction is perpendicular to the first direction and the second direction respectively; the spring plate mounting groove (33) is connected to the stop groove (32); The V-shaped spring (4) includes a first piece and a second piece connected together; the first piece is disposed in the spring mounting groove (33) and extends into the stop groove (32); the first piece is fixed to the support plate (3) by bolts; The second piece is placed in the stop groove (32) and is adapted to abut against the tail of the puller (2) to limit the displacement of the connecting plate (1) in the first direction; The stop groove (32) is adapted to limit the displacement of the tail of the connecting plate (1) in the second direction when the tail of the puller (2) is placed in the corresponding stop groove (32).

3. The plate fixing device according to claim 1, characterized in that, The pull-out aid (2) includes a connecting body (21) and a hook (22); The connecting body (21) extends along the first direction, and its middle part is hinged to the end of the connecting plate (1); the tail of the connecting body (21) is adapted to be placed in the corresponding stop groove (32) and abut against the V-shaped spring piece (4); The hook (22) is hinged to the head of the connecting body (21), and the hook (22) is adapted to be detachably connected to the snap-fit ​​part (11).

4. The plate fixing device according to claim 3, characterized in that, An arc-shaped spring piece (23) is provided between the connecting body (21) and the hook (22). The arc-shaped spring piece (23) is adapted to elastically support the hook (22) when the hook (22) is connected to the locking part (11).

5. The plate fixing device according to claim 1, characterized in that, The support plate (3) is provided with an extension (34), which is adapted to be connected to the surface to be installed by bolts.

6. The plate fixing device according to claim 1, characterized in that, A connector (8) is provided on one side of the board (7) and is located at one end of the board (7); The connecting plate (1) is provided with a reinforcing part (12); the connecting plate (1) is adapted to be disposed opposite to the connector (8) at both ends of the board (7) and disposed on the same side as the connector (8); the reinforcing part (12) is distributed between the connector (8) and the puller (2).

7. The plate fixing device according to claim 1, characterized in that, It also includes a locking strip (5) fixed on the plate (7), the locking strip (5) being adapted to be disposed between the slide (31) and the plate (7) so that the plate (7) and the inner wall of the slide (31) are interference fit.

8. A circuit board mounting chassis, characterized in that, Includes a housing (6) and a plate fixing device as described in any one of claims 1 to 7; The box (6) is a hollow cavity with an opening at the front end; The two support plates (3) of the plate fixing device are respectively arranged on the top and bottom walls of the inner cavity of the box (6); The stop groove (32) of the support plate (3) is distributed at the opening end of the box (6).

9. The circuit board fixing chassis according to claim 8, characterized in that, The plate fixing device consists of several pieces, which are spaced apart inside the box (6).

10. The board fixing chassis according to claim 8, characterized in that, The housing (6) is provided with a clearance hole (61); the clearance hole (61) is arranged opposite to the bolt used to fix the V-shaped spring (4).

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