Fastening device and circuit board assembly

Abstract

A fastening device comprises a fixing piece, a pressing piece, a guiding piece and an elastic piece, the fixing piece is used for being connected with a first plate body, and the fixing piece is provided with a containing cavity; the downward pressing piece is configured to penetrate through the first positioning hole so that the second plate body can be located between the fixing piece and the downward pressing piece; the guide piece is connected between the pressing piece and the fixing piece; one end of the elastic piece is connected with the cavity wall of the containing cavity, the other end of the elastic piece is connected with the guiding piece, and the elastic piece is configured to drive the guiding piece and the pressing piece to abut against the second plate body towards the fixing piece when the second plate body moves to the position between the pressing piece and the fixing piece. The invention further discloses a circuit board assembly. According to the fastening device and the circuit board assembly, the second board body is aligned with the fixing piece, when the second board body abuts against the fixing piece, the second board body is pushed to move between the fixing piece and the pressing piece, and the pressing piece clamps the second board body between the fixing piece and the pressing piece under the matching action of the guiding piece and the elastic piece; and the connection stability between the second plate body and the first plate body is improved.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to a fastening device and a circuit board assembly. Background Art

[0002] When installing a circuit board, an I-nail is usually used to fix the position of the circuit board. Due to the gap reserved between the I-nail and the circuit board, the circuit board and the chassis cannot be in close contact, resulting in poor conductivity of the circuit board. Summary of the invention

[0003] In view of this, it is necessary to provide a fastening device and a circuit board assembly to reduce the problem of poor conductivity when the circuit board is installed.

[0004] An embodiment of the present application provides a fastening device for fixing a first plate body to a second plate body, the second plate body being provided with a first positioning hole, the fastening device comprising a fixing member, a pressing member, a guide member and an elastic member, the fixing member being used to connect the first plate body, the fixing member being provided with a receiving cavity; the pressing member and the fixing member being spaced apart along a first direction, the pressing member being configured to pass through the first positioning hole so that the second plate body is located between the fixing member and the pressing member; one end of the guide member being provided in the receiving cavity, and the other end extending out of the fixing member; the elastic member being provided in the receiving cavity, one end of the elastic member being connected to the cavity wall of the receiving cavity, and the other end being connected to the guide member, the elastic member being configured to drive the guide member and the pressing member connected to the guide member to press the second plate body toward the fixing member when the second plate body moves between the pressing member and the fixing member.

[0005] The technical effects of the embodiments of the present application include: in the above-mentioned fastening device, when the second plate body needs to be installed on the first plate body, first align the first positioning hole on the second plate body with the fixing part installed on the first plate body, and when the second plate body is abutted against the fixing part, push the second plate body to move the second plate body between the fixing part and the pressing part, and the pressing part clamps the second plate body between the fixing part and the pressing part under the cooperation of the guide part and the elastic part, thereby improving the connection stability between the second plate body and the first plate body.

[0006] In some embodiments of the present application, the guide member includes a stop portion and a guide portion, the stop portion is disposed in the receiving cavity, one end of the guide portion is disposed in the receiving cavity and connected to the stop portion, and the other end extends out of the receiving cavity to be connected to the pressing member, the guide portion is slidably connected to the fixing member along the first direction, and the elastic member is sleeved on the outer wall of the guide portion and elastically supported between the stop portion and the cavity wall of the receiving cavity.

[0007] The technical effects of the embodiments of the present application include: when the second plate moves between the fixing member and the pressing member, the pressing member drives the guide part to move in a direction away from the fixing member, and at this time the stop member drives the elastic part to be compressed toward the inner wall of the accommodating cavity, and when the second plate moves to the pressing member and the fixing member, the elastic force of the elastic part acts on the stop member, and the stop member drives the guide part and the pressing member connected to the guide part to move toward the direction of the fixing member, so that the second plate is clamped between the pressing member and the fixing member, thereby improving the stability of the second plate when it is installed on the first plate.

[0008] In some embodiments of the present application, the fastening device further includes a limit member, which is disposed in the receiving cavity and on a side of the stop portion away from the guide portion, and is used to resist the stop portion.

[0009] The technical effects of the embodiments of the present application include: the limiting member reduces the risk of the stopper portion detaching from the receiving cavity when the guide portion moves along the first direction.

[0010] In some embodiments of the present application, the guide member further includes a protruding portion, the protruding portion protruding from the side of the stop portion away from the guide portion, and the limiting member is provided with a limiting hole for the protruding portion to extend into.

[0011] The technical effects of the embodiments of the present application include: the limiting hole reduces the risk of the guide member being displaced relative to the limiting member due to direct abutment against the limiting member.

[0012] In some embodiments of the present application, the outer side wall of the fixing member is provided with a plurality of latching teeth arranged at intervals, and the latching teeth are used for latching and connecting the first plate body.

[0013] The technical effects of the embodiments of the present application include: improving the connection strength between the fixing member and the first plate body.

[0014] In some embodiments of the present application, the pressing member includes a pressing part and a screw part, the pressing part and the fixing member are spaced apart along the first direction, the pressing part is provided with a through hole, the screw part is arranged in the through hole and is fixedly connected to the pressing part, and a threaded hole is provided at one end of the guide part away from the stop part, the guide part extends into the through hole and the screw part is threadedly connected to the threaded hole.

[0015] The technical effects of the embodiments of the present application include: improving the connection strength between the guide member and the pressing member.

[0016] In some embodiments of the present application, a supporting surface is provided on the side of the pressing portion facing the fixing member, and the supporting surface includes a clamping area and a guide area, the clamping area is used to clamp the second plate body, the guide area is arranged around the circumference of the clamping area and is inclined relative to the clamping area, and the guide area is used to make the second plate body slide along the guide area to the clamping area.

[0017] The technical effects of the embodiments of the present application include: when pushing the second plate body to move between the fixing member and the pressing member, the second plate body can slide along the guide area to the clamping area, thereby reducing the risk of the second plate body deviating from the moving trajectory during movement.

[0018] The present application also provides a circuit board assembly, including a first plate body, a second plate body and the above-mentioned fastening device, the fixing member is connected to the first plate body, the pressing member passes through the first positioning hole on the second plate body to make the second plate body contact the fixing member, the elastic member is configured to drive the compression between the cavity wall of the accommodating cavity and the guide member when the second plate body moves along the second direction, and the elastic member is also configured to drive the guide member and the pressing member connected to the guide member to press the second plate body toward the fixing member when the second plate body moves between the fixing member and the pressing member, and the first direction and the second direction are perpendicular to each other.

[0019] The technical effects of the embodiments of the present application include: in the above-mentioned circuit board assembly, the fastening device fixes the second board body on the first board body, and fastens the second board body and the first board body.

[0020] In some embodiments of the present application, the circuit board assembly further includes a locking member, which is configured to lock the other end of the first board and the second board after the fastening device connects one end of the first board and the second board.

[0021] The technical effects of the embodiments of the present application include: the locking member locks the other ends of the first plate body and the second plate body after the fastening device fastens the first plate body and the second plate body, thereby improving the connection stability between the first plate body and the second plate body.

[0022] In some embodiments of the present application, the first positioning hole includes a first positioning portion and a second positioning portion that are interconnected, and a projection of the second positioning portion in the second direction is located within a projection range of the first positioning portion in the second direction.

[0023] The technical effects of the embodiments of the present application include: the guide member slides into the second positioning portion along the first positioning portion and is held in the second positioning portion at the same time.

[0024] In the above-mentioned fastening device and circuit board assembly, when the second plate body needs to be installed on the first plate body, first align the first positioning hole on the second plate body with the fixing piece installed on the first plate body. When the second plate body is against the fixing piece, push the second plate body to move it between the fixing piece and the pressing piece. The pressing piece clamps the second plate body between the fixing piece and the pressing piece under the cooperation of the guide piece and the elastic piece, thereby improving the connection stability between the second plate body and the first plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a fastening device and a circuit board assembly according to an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the exploded structure of a fastening device according to an embodiment of the present application.

[0027] Figure 3 Schematic diagram of the structure of a fastening device according to an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the exploded structure of a fastening device according to an embodiment of the present application.

[0029] Figure 5 This is a schematic top view of the structure of a second plate passing through a pressing member according to an embodiment of the present application.

[0030] Figure 6 for Figure 5 Enlarged structural diagram of the components in the figure.

[0031] Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure along the section line AA.

[0032] Figure 8 This is a structural schematic diagram of a second plate body clamped between a fixing member and a pressing member in an embodiment of the present application.

[0033] Fig. 9 for Figure 8 Enlarged structural diagram of the components in the figure.

[0034] Fig.10 for Figure 8 Schematic diagram of the cross-sectional structure along the section line BB.

[0035] Fig.11 Schematic diagram of the structure of a locking member according to an embodiment of the present application.

[0036] Main component symbols

[0037] Fastening device 100

[0038] The first plate 10

[0039] The second plate 20

[0040] First positioning hole 21

[0041] First positioning portion 211

[0042] The second positioning portion 212

[0043] Second positioning hole 22

[0044] Fixing 30

[0045] Accommodation chamber 31

[0046] Tooth 32

[0047] Lower pressure piece 40

[0048] Lower pressing part 41

[0049] Through hole 411

[0050] Support surface 412

[0051] Compact area 4121

[0052] Guide area 4122

[0053] Screw part 42

[0054] Guide 50

[0055] Stopper 51

[0056] Guide portion 52

[0057] Threaded hole 521

[0058] Protrusion 53

[0059] Elastic member 60

[0060] Limiting piece 70

[0061] Limit hole 71

[0062] Circuit board assembly 200

[0063] Locking piece 80

[0064] Fixing portion 81

[0065] Locking portion 82

[0066] First direction Z

[0067] Second direction X

[0068] The third direction Y

[0069] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0071] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art belonging to the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The terms "vertical", "horizontal", "left", "right", "top", "bottom" and similar expressions used herein are only for illustrative purposes and are not intended to limit the present application.

[0073] It will be appreciated that when describing two components as being arranged in parallel / perpendicular, a tolerance of ±10% is allowed for the angle between the two components relative to the standard parallel / perpendicular.

[0074] An embodiment of the present application provides a fastening device for fixing a first plate body to a second plate body, wherein the second plate body is provided with a first positioning hole, and the fastening device comprises a fixing member, a pressing member, a guide member and an elastic member. The fixing member is used to connect the first plate body, and the fixing member is provided with a receiving cavity. The pressing member and the fixing member are arranged at intervals along a first direction, and the pressing member is configured to pass through the first positioning hole so that the second plate body is located between the fixing member and the pressing member. One end of the guide member is provided in the receiving cavity, and the other end extends out of the fixing member. The elastic member is provided in the receiving cavity, one end of the elastic member is connected to the cavity wall of the receiving cavity, and the other end is connected to the guide member, and the elastic member is configured to drive the guide member and the pressing member connected to the guide member to press against the second plate body toward the fixing member when the second plate body moves between the pressing member and the fixing member.

[0075] In the above-mentioned fastening device, when the second plate body needs to be installed on the first plate body, first align the first positioning hole on the second plate body with the fixing piece installed on the first plate body. When the second plate body is against the fixing piece, push the second plate body to move it between the fixing piece and the pressing piece. The pressing piece clamps the second plate body between the fixing piece and the pressing piece under the cooperation of the guide piece and the elastic piece, thereby improving the connection stability between the second plate body and the first plate body.

[0076] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0077] Please also read Figure 1 and Figure 2 The fastening device 100 provided in the embodiment of the present application is used to fix the first plate body 10 to the second plate body 20, and the second plate body 20 is provided with a first positioning hole 21.

[0078] Please also read Figure 2 , Figure 3 and Figure 4 The fastening device 100 includes a fixing member 30, a pressing member 40, a guide member 50 and an elastic member 60. The fixing member 30 is used to connect the first plate body 10, and the fixing member 30 is provided with a receiving cavity 31. The pressing member 40 and the fixing member 30 are arranged at intervals along the first direction Z, and the pressing member 40 is configured to pass through the first positioning hole 21 so that the second plate body 20 is located between the fixing member 30 and the pressing member 40. One end of the guide member 50 is arranged in the receiving cavity 31, and the other end extends out of the fixing member 30. The elastic member 60 is arranged in the receiving cavity 31, one end of the elastic member 60 is connected to the cavity wall of the receiving cavity 31, and the other end is connected to the guide member 50. The elastic member 60 is configured to drive the guide member 50 and the pressing member 40 connected to the guide member 50 to press the second plate body 20 toward the fixing member 30 when the second plate body 20 moves between the pressing member 40 and the fixing member 30.

[0079] In the above-mentioned fastening device 100, when the second plate body 20 needs to be installed on the first plate body 10, first align the first positioning hole 21 on the second plate body 20 with the fixing member 30 installed on the first plate body 10. When the second plate body 20 is abutted against the fixing member 30, the second plate body 20 is pushed so that the second plate body 20 moves between the fixing member 30 and the pressing member 40. The pressing member 40 clamps the second plate body 20 between the fixing member 30 and the pressing member 40 under the cooperation of the guide member 50 and the elastic member 60, thereby improving the connection stability between the second plate body 20 and the first plate body 10.

[0080] Please refer again Figure 1 and Figure 2 In this embodiment, each second plate body 20 is fixedly connected to the first plate body 10 via two fastening devices 100 , and the two fastening devices 100 are spaced apart along the third direction Y to improve the stability of the second plate body 20 installed on the first plate body 10 .

[0081] Optionally, the number of the fastening devices 100 can be adjusted according to the size of the second plate body 20 , that is, the number of the fastening devices 100 can be any one of 1, 3, 4, 5 and 6, thereby improving the versatility of the fastening devices 100 .

[0082] Please also read Figure 5 , Figure 6 and Figure 7 In some embodiments, the guide member 50 includes a stopper 51 and a guide member 52. The stopper 51 is disposed in the receiving cavity 31. One end of the guide member 52 is disposed in the receiving cavity 31 and connected to the stopper 51, and the other end extends out of the receiving cavity 31 to connect to the pressing member 40. The guide member 52 is slidably connected to the fixing member 30 along the first direction Z. The elastic member 60 is sleeved on the outer wall of the guide member 52 and elastically abuts between the stopper 51 and the cavity wall of the receiving cavity 31. When the second plate body 20 moves to between the fixing member 30 and the pressing member 40, the pressing member 40 drives the guide portion 52 to move in the direction away from the fixing member 30. At this time, the stop portion 51 drives the elastic member 60 to be compressed toward the inner wall of the accommodating cavity 31. When the second plate body 20 moves to the pressing member 40 and the fixing member 30, the elastic force of the elastic member 60 acts on the stop portion 51. The stop portion 51 drives the guide portion 52 and the pressing member 40 connected to the guide portion 52 to move in the direction of the fixing member 30, so that the second plate body 20 is clamped between the pressing member 40 and the fixing member 30, thereby improving the stability of the second plate body 20 when it is installed on the first plate body 10.

[0083] Please also read Figure 4 and Figure 7 In some embodiments, the fastening device 100 further includes a limit member 70, which is disposed in the receiving cavity 31 and is disposed on the side of the stop portion 51 away from the guide portion 52. The limit member 70 is used to resist the stop portion 51. The limit member 70 reduces the risk of the stop portion 51 being separated from the receiving cavity 31 when the guide portion 52 moves along the first direction Z.

[0084] Please continue reading Figure 4 and Figure 7 In some embodiments, the guide member 50 also includes a protrusion 53, which is protruding from the side of the stop portion 51 away from the guide portion 52. The limiting member 70 is provided with a limiting hole 71, and the limiting hole 71 is used for the protrusion 53 to extend into. The limiting hole 71 reduces the risk of directly abutting against the limiting member 70 and causing the guide member 50 to deviate relative to the limiting member 70.

[0085] The outer side wall of the fixing member 30 is provided with a plurality of latching teeth 32 arranged at intervals. The latching teeth 32 are used for latching and connecting the first plate body 10 to improve the connection strength between the fixing member 30 and the first plate body 10 .

[0086] Please continue reading Figure 4 and Figure 7In some embodiments, the pressing member 40 includes a pressing portion 41 and a screw portion 42. The pressing portion 41 and the fixing member 30 are spaced apart along the first direction Z. The pressing portion 41 is provided with a through hole 411. The screw portion 42 is provided in the through hole 411 and is fixedly connected to the pressing portion 41. A threaded hole 521 is provided at one end of the guide portion 52 away from the stopper portion 51. The guide portion 52 extends into the through hole 411 and the screw portion 42 is threadedly connected to the threaded hole 521, thereby improving the connection strength between the guide portion 50 and the pressing member 40.

[0087] Please also read Figure 8 , Fig. 9 and Fig.10 In some embodiments, a side of the pressing portion 41 facing the fixing member 30 is provided with a supporting surface 412, and the supporting surface 412 includes a pressing area 4121 and a guide area 4122, and the pressing area 4121 is used to press against the second plate 20. The guide area 4122 is arranged around the circumference of the pressing area 4121 and is inclined relative to the pressing area 4121, and the guide area 4122 is used to make the second plate 20 slide along the guide area 4122 to the pressing area 4121. When the second plate 20 is pushed to move between the fixing member 30 and the pressing member 40, the second plate 20 can slide along the guide area 4122 to the pressing area 4121, reducing the risk of the second plate 20 deviating from the moving track during the movement.

[0088] Please also read Figure 1 , Figure 2 and Figure 4 The present application also provides a circuit board assembly 200, comprising a first plate body 10, a second plate body 20 and the above-mentioned fastening device 100, wherein the fixing member 30 is connected to the first plate body 10, and the pressing member 40 passes through the first positioning hole 21 on the second plate body 20 to make the second plate body 20 contact the fixing member 30. The elastic member 60 is configured to drive the compression between the cavity wall of the receiving cavity 31 and the guide member 50 when the second plate body 20 moves along the second direction X. The elastic member 60 is also configured to drive the guide member 50 and the pressing member 40 connected to the guide member 50 to press the second plate body 20 toward the fixing member 30 when the second plate body 20 moves between the fixing member 30 and the pressing member 40, and the first direction Z is perpendicular to the second direction X. The fastening device 100 fixes the second plate body 20 on the first plate body 10, and fastens the second plate body 20 to the first plate body 10.

[0089] Please also read Figure 1 and Fig.11In some embodiments, the circuit board assembly 200 further includes a locking member 80, which is configured to lock the other end of the first board 10 and the second board 20 after the fastening device 100 connects one end of the first board 10 and the second board 20. The locking member 80 locks the other end of the first board 10 and the second board 20 after the fastening device 100 fastens and connects the first board 10 and the second board 20, thereby improving the connection stability between the first board 10 and the second board 20.

[0090] See also Fig.11 In some embodiments, the locking member 80 includes a fixing portion 81 and a locking portion 82, the fixing portion 81 is connected to the first plate body 10, the second plate body 20 is provided with a second positioning hole 22, the second positioning hole 22 and the first positioning hole 21 are spaced apart along the second direction X, the locking portion 82 passes through the second positioning hole 22 and is connected to the fixing portion 81, and the locking portion 82 cooperates with the fixing portion 81 to improve the connection strength between the first plate body 10 and the second plate body 20.

[0091] In this embodiment, the circuit board assembly 200 includes two locking members 80 , which are spaced apart along the third direction Y to improve the stability of locking the second board body 20 on the first board body 10 .

[0092] Optionally, the number of the locking members 80 can be adjusted according to the size of the second plate body 20 , that is, the number of the locking members 80 can be any one of 1, 3, 4, 5 and 6.

[0093] Please also read Figure 2 and Figure 3 In some embodiments, the first positioning hole 21 includes a first positioning portion 211 and a second positioning portion 212 that are interconnected, and the projection of the second positioning portion 212 in the second direction X is located within the projection range of the first positioning portion 211 in the second direction X, so that the guide member 50 slides into the second positioning portion 212 along the first positioning portion 211 and is clamped in the second positioning portion 212.

[0094] Please also read Figure 1 , Figure 7 and Fig.10 In some implementations, the step of fastening the second plate 20 to the first plate 10 by the fastening device 100 includes:

[0095] First, fix the fixing member 30 to the first plate body 10. When installing the second plate body 20, align the first positioning portion 211 in the first positioning hole 21 on the second plate body 20 with the pressing member 40, so that the pressing member 40 passes through the first positioning portion 211, and the second plate body 20 falls on the fixing member 30;

[0096] Next, the second plate 20 is pushed along the second direction X, so that the second plate 20 slides along the guide area 4122 on the pressing member 40 to the pressing area 4121 of the pressing member 40. At this time, the second plate 20 generates a thrust on the pressing member 40, so that the pressing member 40 drives the guide member 50 connected to the pressing member 40 to move in a direction away from the fixing member 30. At this time, the stopper 51 in the guide member 50 compresses the elastic member 60 in the fixing member 30.

[0097] Next, after the second plate body 20 moves between the fixing member 30 and the pressing member 40, the elastic member 60 generates elastic force on the stopper 51 in the guide member 50, so that the guide member 50 drives the pressing member 40 to generate pressure toward the fixing member 30, thereby fastening the second plate body 20 between the fixing member 30 and the pressing member 40;

[0098] Finally, the other end of the second plate body 20 is fixed to the first plate body 10 through the locking member 80 to improve the stability of the second plate body 20 on the first plate body 10 .

[0099] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A fastening device for fixing a first plate to a second plate, wherein the second plate is provided with a first positioning hole, characterized in that: The fastening device comprises: A fixing member, used for connecting the first plate, wherein the fixing member is provided with a receiving cavity; A pressing member and the fixing member are spaced apart along a first direction, and the pressing member is configured to pass through the first positioning hole so that the second plate is located between the fixing member and the pressing member; A guide member, one end of which is disposed in the receiving cavity and the other end of which extends out of the fixing member; An elastic member is arranged in the accommodating cavity, one end of the elastic member is connected to the cavity wall of the accommodating cavity, and the other end is connected to the guide member. The elastic member is configured to drive the guide member and the pressing member connected to the guide member to press the second plate body toward the fixed member when the second plate body moves between the pressing member and the fixed member.

2. The fastening device according to claim 1, characterized in that: The guide member includes a stop portion and a guide portion, the stop portion is arranged in the receiving cavity, one end of the guide portion is arranged in the receiving cavity and connected to the stop portion, and the other end extends out of the receiving cavity to connect to the pressing member, the guide portion is slidably connected to the fixing member along the first direction, and the elastic member is sleeved on the outer side wall of the guide portion and elastically supported between the stop portion and the cavity wall of the receiving cavity.

3. The fastening device according to claim 2, characterized in that: The fastening device further comprises a limiting member, which is arranged in the receiving cavity and on a side of the stopper away from the guide portion, and is used to abut against the stopper.

4. The fastening device according to claim 3, characterized in that: The guide member further comprises a protruding portion, the protruding portion is protrudingly arranged on a side of the stop portion away from the guide portion, and the limiting member is provided with a limiting hole, the limiting hole is used for the protruding portion to extend therein.

5. The fastening device according to claim 1, characterized in that: The outer side wall of the fixing member is provided with a plurality of latching teeth arranged at intervals, and the latching teeth are used for latching and connecting the first plate body.

6. The fastening device according to claim 2, characterized in that: The pressing member includes a pressing part and a screw part, the pressing part and the fixing member are spaced apart along the first direction, the pressing part is provided with a through hole, the screw part is arranged in the through hole and is fixedly connected to the pressing part, the guide part is provided with a threaded hole at one end away from the stop part, the guide part extends into the through hole and the screw part is threadedly connected to the threaded hole.

7. The fastening device according to claim 6, characterized in that: The pressing portion is provided with a supporting surface on the side facing the fixing member, and the supporting surface includes a clamping area and a guiding area, the clamping area is used to clamp the second plate body, the guiding area is arranged around the circumference of the clamping area and is inclined relative to the clamping area, and the guiding area is used to make the second plate body slide along the guiding area to the clamping area.

8. A circuit board assembly, characterized in that: It includes a first plate body, a second plate body and a fastening device as described in any one of claims 1 to 7, the fixing member is connected to the first plate body, the pressing member passes through the first positioning hole on the second plate body to make the second plate body contact the fixing member, the elastic member is configured to drive the compression between the cavity wall of the accommodating cavity and the guide member when the second plate body moves along the second direction, and the elastic member is also configured to drive the guide member and the pressing member connected to the guide member to press the second plate body toward the fixing member when the second plate body moves between the fixing member and the pressing member, and the first direction and the second direction are perpendicular to each other.

9. The circuit board assembly according to claim 8, wherein: The circuit board assembly further includes a locking member configured to lock the other end of the first board and the second board after the fastening device connects one end of the first board and the second board.

10. The circuit board assembly according to claim 8, wherein: The first positioning hole includes a first positioning portion and a second positioning portion that are interconnected, and a projection of the second positioning portion in the second direction is located within a projection range of the first positioning portion in the second direction.

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