CN216118610U - Circuit board extension assembly and hard disk detection device - Google Patents

Abstract

The utility model provides a circuit board expansion assembly and hard disk detection equipment, wherein the circuit board expansion assembly comprises a mainboard and a first expansion card; the main board is provided with a first electronic element and a plurality of expansion card connectors, and the expansion card connectors are electrically connected with the first electronic element; the first expansion card is provided with a second electronic element and a plurality of mainboard connectors, and the mainboard connectors are electrically connected with the second electronic element; the first expansion card is positioned above the mainboard, and the mainboard connector is positioned at one side of the first expansion card close to the mainboard and is connected with the expansion card connectors in a one-to-one correspondence manner. By applying the circuit board expansion assembly provided by the embodiment of the utility model, the expansion card connectors are arranged on the mainboard, and the corresponding mainboard connectors are arranged on the expansion cards, so that the expansion cards can be connected with the mainboard, and the expansion of the functions of the mainboard is realized.

Description

Circuit board extension assembly and hard disk detection device

Technical Field

The utility model relates to the technical field of circuit boards, in particular to a circuit board extension assembly and hard disk detection equipment.

Background

Generally, since the internal space of a host of an electronic device is limited, if all functions are integrated on the host, the size of the host is very large, the size of the host is large, and it is not necessary to integrate all functions on the host. Therefore, only a core function module such as a processor is usually provided on the main board. If only be provided with core function modules such as treater on some hard disk check out test set's the mainboard, when needing to carry out synchronous test to a plurality of hard disks, or when needing to carry out synchronous test to the multiple parameter of hard disk, because functional module on the mainboard is less, just can't realize the synchronous test of multiple demand, leads to hard disk detection efficiency lower.

SUMMERY OF THE UTILITY MODEL

Based on this, the present invention provides a circuit board expansion assembly and a hard disk detection device, which have the advantages of being capable of performing function expansion on a motherboard of the hard disk detection device and facilitating improvement of detection efficiency of a hard disk.

According to a first aspect of the present invention, there is provided a circuit board expansion assembly, comprising a main board and a first expansion card; the main board is provided with a first electronic element and a plurality of expansion card connectors, and the expansion card connectors are electrically connected with the first electronic element; the first expansion card is provided with a second electronic element and a plurality of mainboard connectors, and the mainboard connectors are electrically connected with the second electronic element; the first expansion card is positioned above the mainboard, and the mainboard connector is positioned at one side of the first expansion card close to the mainboard and is connected with the expansion card connectors in a one-to-one correspondence manner.

In an optional embodiment, the main board is further provided with a plurality of first mounting holes; a plurality of second mounting holes are formed in the first expansion card, and the second mounting holes correspond to the first mounting holes one to one. .

In an optional embodiment, the device further comprises a main board fixing frame; the mainboard fixing frame is arranged between the mainboard and the first expansion card;

a plurality of limiting through holes are formed in the mainboard fixing frame and correspond to the expansion card connectors one by one; the main board connector penetrates through the limiting through hole to be connected with the expansion card connector.

In an optional embodiment, a plurality of first fixing pieces are arranged on the main board fixing frame, and a plurality of first fixing pieces correspond to a plurality of first mounting holes and a plurality of second mounting holes one to one.

In an optional embodiment, the first fixing member is a hollow rivet column, and has a first connecting portion for fixing the first expansion card and a second connecting portion for fixing the main board; the first connecting portion and the second connecting portion are communicated with each other, and a connecting piece is inserted into and connected with the main board and the first expansion card.

In an optional embodiment, a plurality of second fixing pieces are further arranged on the main board fixing frame; a plurality of third mounting holes are formed in the main board; the second fixing pieces correspond to the third mounting holes one to one.

In an optional embodiment, the main board fixing frame comprises a limiting plate and a vertical plate; the vertical plate is arranged around the limiting plate, extends from the limiting plate to the direction of the main board, and is connected with the limiting plate to form an accommodating space for accommodating the main board; the limiting plate is provided with the limiting through hole.

In an alternative embodiment, two oppositely arranged vertical plates are provided with vent holes.

In an optional embodiment, the main board fixing frame further comprises a connecting board; the connecting plate is arranged on one side, far away from the limiting plate, of the vertical plate and extends in the direction of the vertical plate back to the limiting plate, and a screw hole is formed in the connecting plate and corresponds to the mounting hole of the case.

In an optional embodiment, the main board is further provided with a plurality of heat sink mounting holes; the mainboard fixing frame is also provided with a plurality of third fixing parts, and the third fixing parts are in one-to-one correspondence with the heat dissipation device mounting holes.

In an optional embodiment, the system further comprises a second expansion card and a patch panel; the second expansion card is connected with the main board through the adapter board;

the second expansion card is provided with a plurality of first adapters;

a plurality of second adapters are arranged on one side of the adapter plate, which is far away from the main plate, and the second adapters are connected with the first adapters in a one-to-one correspondence manner;

and a plurality of third adapters are arranged on one side of the adapter plate close to the main board, and the plurality of third adapters are connected with the plurality of expansion card connectors in a one-to-one correspondence manner.

According to a second aspect of the present invention, there is provided a hard disk detection device, including a chassis, and the circuit board expansion assembly according to any one of the above embodiments, disposed inside the chassis.

By applying the technical scheme of the embodiment of the utility model, the expansion card connectors are arranged on the mainboard, and the corresponding mainboard connectors are arranged on the expansion cards, so that the expansion cards can be connected with the mainboard, the expansion of the functions of the mainboard is realized, and the synchronous detection of the hard disk is facilitated, and the detection efficiency of the hard disk is improved; meanwhile, the mainboard fixing frame is arranged to fix the mainboard and the expansion cards, so that the dimensional tolerance among all parts is reduced, the stability of the circuit board expansion assembly is improved, and the stable connection between the expansion cards and the mainboard is ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.

For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a first exploded view of a circuit board expansion assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first expansion card according to an embodiment of the present invention;

fig. 3 is a first perspective view of the motherboard fixing frame according to the embodiment of the utility model;

fig. 4 is a second perspective view of the motherboard fixing frame according to the embodiment of the utility model;

FIG. 5 is an installation diagram of a first expansion card according to an embodiment of the present invention;

FIG. 6 is a second exploded view of a circuit board expansion assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second expansion card according to the embodiment of the present invention;

fig. 8 is a first perspective view of the interposer according to the embodiment of the present invention;

fig. 9 is a second perspective view of the interposer according to the embodiment of the present invention;

fig. 10 is an installation diagram of a second expansion card according to the embodiment of the present invention.

In the figure: 10-a mainboard fixing frame, 11-a limiting plate, 111-a limiting through hole, 112-a first fixing piece, 113-a second fixing piece, 114-a third fixing piece, 12-a vertical plate, 121-a vent hole, 13-a connecting plate, 131-a screw hole, 20-a mainboard, 21-an expansion card connector, 22-a first mounting hole, 23-a third mounting hole, 24-a heat dissipation device mounting hole, 30-a first expansion card, 31-a mainboard connector, 32-a second mounting hole, 40-a second expansion card, 41-a first adapter, 42-a fifth mounting hole, 50-an adapter plate, 51-a second adapter, 52-a third adapter, 53-a fourth mounting hole and 60-a fan.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Some electronic devices such as hard disk detection devices are used for detecting hard disks, and a mainboard of the electronic devices is provided with core function modules such as a processor, so that when a plurality of hard disks need to be synchronously tested or a plurality of parameters of the hard disks need to be synchronously tested, because the number of the function modules on the mainboard is small, a plurality of synchronous tests cannot be realized, and the hard disk detection efficiency is low.

According to the technical scheme, the expansion card connectors are arranged on the mainboard, and the corresponding mainboard connectors are arranged on the expansion cards, so that the expansion cards can be connected with the mainboard, the expansion of the functions of the mainboard is realized, the synchronous detection of the hard disk is facilitated, and the detection efficiency of the hard disk is improved.

Referring to fig. 1, fig. 1 is a first exploded view of a circuit board expansion assembly according to an embodiment of the present invention.

The circuit board expansion assembly comprises a main board 20 and a first expansion card 30; the main board 20 is a core circuit board of the hard disk detection device, and is provided with core components such as a processor and the like for controlling the whole hard disk detection device; the first expansion card 30 is used for implementing function expansion to meet the test requirements of the hard disk.

A first electronic component (not shown) and a plurality of expansion card connectors 21 are arranged on the main board 20, and the expansion card connectors 21 are electrically connected with the first electronic component; the first expansion card 30 is provided with a second electronic component (not shown) and a plurality of motherboard connectors 31, and the motherboard connectors 31 are electrically connected with the second electronic component; the first expansion card 30 is located above the mainboard, and the mainboard connector 31 is located the first expansion card 30 is close to one side of the mainboard 20 and is connected with the expansion card connector 21 in a one-to-one correspondence manner, so that the expansion of the test function of the mainboard 20 is realized, and the hard disk test efficiency is improved.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a first expansion card according to an embodiment of the present invention.

In this embodiment, in order to fix the first expansion card 30 on the motherboard 20, the motherboard 20 is further provided with a plurality of first mounting holes 22; the first expansion card 30 is provided with a plurality of second mounting holes 32, the second mounting holes 32 are connected with the first mounting holes 22 in a one-to-one correspondence manner, and the first expansion card 30 can be fixed on the main board 20 through screw connection, so that the connection stability of the first expansion card 30 and the main board 20 is enhanced.

In an alternative embodiment, in order to make the first expansion card 30 more firmly connected with the motherboard 20, a motherboard holder 10 is further disposed between the first expansion card 30 and the motherboard 20, and the motherboard holder 10 is used for mounting the motherboard 20 and is in support connection with the first expansion card 30. A plurality of limiting through holes 111 are formed in the main board fixing frame 10, and the limiting through holes 111 correspond to the expansion card connectors 21 one by one; the board connector 31 passes through the limiting through hole 111 to connect with the expansion card connector 21.

Since the positions of the expansion card connector 21 and the first mounting hole 22 on the motherboard 20 are determined according to the layout requirement, the position of the limiting through hole 111 on the limiting plate 11 corresponds to the position of the expansion card connector 21 on the motherboard 20, the size of the limiting through hole 111 corresponds to the size of the expansion card connector 21, and the position of the first fixing member 112 corresponds to the position of the first mounting hole 22 on the motherboard 20.

Referring to fig. 3 and 4, fig. 3 is a first perspective view of the motherboard fixing frame according to the embodiment of the utility model; fig. 4 is a second perspective view of the motherboard fixing frame according to the embodiment of the utility model. The main board fixing frame 10 includes a limiting plate 11 and a vertical plate 32 disposed around the limiting plate 11. The limiting plate 11 is provided with a plurality of limiting through holes 111, the limiting through holes 111 correspond to the expansion card connectors 21 one by one, and the size of the limiting through holes 111 corresponds to the size of the expansion card connectors 21; the board connector 31 is connected to the expansion card connector 21 through the restriction through-hole 111.

In an alternative embodiment, the expansion card connector 21 may be a dual in-line receptacle; the board connector 31 may be a dip corresponding to the size and specification of a dip.

In an alternative embodiment, in order to enable the main board 20 to be stably mounted on the main board fixing frame 10, a plurality of first mounting holes 22 are further formed in the main board 20; the limiting plate 11 of the main board fixing frame 10 is provided with a plurality of first fixing pieces 112, the plurality of first fixing pieces 112 correspond to the plurality of first mounting holes 22 one by one, and a plurality of second mounting holes 32, which are connected and fixed through screws, so that the main board 20 is mounted on the main board fixing frame 10; and fixes the first expansion card 30 to the motherboard fixing frame 10.

Specifically, the first fixing member 112 is a hollow rivet column, and has a first connecting portion for fixing the first expansion card 30 and a second connecting portion for fixing the main board 20; the first connecting portion and the second connecting portion are communicated with each other, so that a connecting member can be inserted into and connected with the main board 20 and the first expansion card 30.

The main board fixing frame 10 is further provided with four second fixing pieces 113; four third mounting holes 23 are formed in the main board 20; the four second fixing members 113 correspond to the four third mounting holes 23 one to one. Wherein, four second mounting 113 can be the screw hole to fix limiting plate 11 and mainboard 20 mutually, further improve mainboard mount 10 and mainboard 20's connection stability.

The main board fixing frame 10 comprises a limiting plate 11 and a vertical plate 12; the vertical plate 12 is arranged around the limiting plate 11, extends from the limiting plate 11 to the main board 20, and is connected with the limiting plate to form a containing space for containing the main board; the limiting plate 11 is provided with the limiting through hole 111. By providing the limiting through hole 111 on the limiting plate 11, the motherboard connector 31 of the first expansion card 30 is connected with the expansion card connector on the motherboard 20 through the limiting through hole 111.

In an alternative embodiment, in order to facilitate ventilation and heat dissipation of the main board 20, two oppositely disposed vertical plates 32 are provided with vent holes 121, the vent holes 121 correspond to the mounting positions of the heat dissipation devices, and the vent holes 121 may be rectangular vent holes.

In an alternative embodiment, in order to stably mount the motherboard holder 10 inside a chassis of an electronic device, the motherboard holder 10 further includes a connecting board 13; the connecting plate 13 is mounted on one side of the vertical plate 12 far away from the limiting plate 11 and extends from the vertical plate 12 in a direction away from the limiting plate 11, the connecting plate 13 is further provided with a screw hole 131, and the screw hole 131 corresponds to a mounting hole of the chassis.

In an alternative embodiment, in order to facilitate the installation of the heat sink 60 on the side of the motherboard 20 away from the first expansion card 30 to dissipate heat of the motherboard 20, a plurality of heat sink installation holes 24 are further formed on the motherboard 20; the motherboard fixing frame 10 is further provided with a plurality of third fixing members 114, and the plurality of third fixing members 114 correspond to the plurality of heat sink mounting holes 24 one to one. By the cooperation of the four heat sink mounting holes 24 and the third fixing member 114, the heat sink such as a fan can be mounted on the main board 20 by screw fixation. Since the heat sink 60 can be fixed to the motherboard fixing frame 10 by screws, the motherboard fixing frame 10 is partially stressed, and thus the motherboard 20 is not easily deformed, thereby preventing unstable connection due to deformation of the motherboard 20. The heat sink 60 may be a fan.

Referring to fig. 5, fig. 5 is an installation diagram of the first expansion card according to the embodiment of the present invention.

The first expansion card 30 is connected with the motherboard 20 through the motherboard connector 31 and the expansion card connector 21, so that expansion of related functions of the motherboard 20 is realized, and convenience are realized; the first expansion card 30 is positioned above the main board 20, so that the size of the expansion structure is small, and the size of the case is favorably reduced; further, the main board fixing frame 10 is further arranged between the first expansion card 30 and the main board 20, so that the main board 20 and the first expansion card 30 can be conveniently installed and connected, the stability of the expansion structure is improved, and poor contact caused by mechanical vibration is prevented.

Since the positions of the expansion card connector 21 and the first mounting hole on the motherboard 20 are determined according to the layout requirement, the position of the limiting through hole 111 on the limiting plate 11 corresponds to the position of the expansion card connector 21 on the motherboard 20, the size of the limiting through hole 111 corresponds to the size of the expansion card connector, and the position of the first fixing member 112 corresponds to the position of the first mounting hole on the motherboard 20.

In an alternative embodiment, a second expansion card 40 and a patch panel 50 are also included.

Referring to fig. 6, fig. 6 is a second exploded view of the circuit board expansion assembly according to the embodiment of the utility model.

The second expansion card 40 is used to implement the expansion of the motherboard function, and the implemented function expansion may be different from the function expansion implemented by the first expansion card 30. Since the position and number of the connectors on the second expansion card 40 do not correspond to those of the expansion card connectors of the motherboard 20, the second expansion card 40 cannot be directly connected to the motherboard 20, and therefore the second expansion card 40 needs to be connected to the motherboard 20 through the adapter board 50.

Referring to fig. 7 to 9, fig. 7 is a schematic structural diagram of a second expansion card according to an embodiment of the present invention; fig. 8 is a first perspective view of the interposer according to the embodiment of the present invention; fig. 9 is a second perspective view of the interposer according to the embodiment of the utility model.

Specifically, the second expansion card 40 is provided with a plurality of first adapters 41; a plurality of second adapters 51 are arranged on one side of the adapter plate 50 away from the main plate 20, and the plurality of second adapters 51 are connected with the plurality of first adapters 41 in a one-to-one correspondence manner; a plurality of third adapters 52 are disposed on a side of the interposer close to the motherboard 20, and the plurality of third adapters 52 are connected with the plurality of expansion card connectors 21 in a one-to-one correspondence manner.

The second expansion card 40 is connected to the second adapter 51 through the first adapter 41 to realize the connection between the second expansion card 40 and the adapter board 50, and the third adapter 52 is connected to the expansion card connector 21 to realize the connection between the adapter board 50 and the motherboard 20, and further realize the connection between the second expansion card 40 and the motherboard 20.

In an alternative embodiment, the expansion card connector 21 may be a dual in-line receptacle; the third adapter 52 may be a dip pin corresponding to the size and specification of a dip seat; the second adapter 51 may be a dip and the first adapter 41 may be a dip corresponding to the size and specification of the dip.

In order to facilitate the stable connection of the adapter plate 50, a fourth mounting hole 53 is further formed on the adapter plate 50, and a fifth mounting hole 42 is further formed on the second expansion card 40; a plurality of second fixing parts 113 are further arranged on one side of the mainboard fixing frame 10 close to the second expansion card 40; the fifth mounting hole 53 corresponds to the fourth mounting hole 53, the second fixing member 113, and the first mounting hole 22, so that the second expansion card 40, the interposer 50, the motherboard fixing frame 10, and the motherboard 20 are fixedly mounted together, the mounting stability of the expansion structure is improved, and poor contact of the connector caused by mechanical shaking is prevented.

Referring to fig. 10, fig. 10 is an installation diagram of a second expansion card according to an embodiment of the present invention.

The second expansion card is connected with the mainboard through the adapter plate, so that the expansion of related functions of the mainboard is realized, and the expansion is convenient and fast; the second expansion card is positioned above the mainboard, so that the size of the expansion structure is smaller, and the reduction of the volume of the case is facilitated; furthermore, still be provided with the mainboard mount between second expansion card and the mainboard to the mainboard of being convenient for and the erection joint of second expansion card have improved extension structure's stability, prevent because the contact failure that mechanical vibration brought.

According to a second aspect of the present invention, there is provided a hard disk detection device, including a case, a processor disposed inside the case, and a circuit board extension assembly as described in any one of the above embodiments; the processor is arranged on the mainboard, and each expansion card connector on the mainboard is electrically connected with the processor.

By applying the technical scheme of the embodiment of the utility model, the expansion card connectors are arranged on the mainboard, and the corresponding mainboard connector is arranged on each expansion card, so that each expansion card can be connected with the mainboard, the expansion of the functions of the mainboard is realized, and the synchronous detection of the hard disk is facilitated, and the detection efficiency of the hard disk is improved. Meanwhile, the mainboard fixing frame is used for installing the mainboard and the fan, so that the connection between the mainboard and each expansion card is more stable, and poor contact caused by mechanical shaking is not easy to occur; and still be convenient for install heat abstractor and dispel the heat to the mainboard, and the setting that each mounting hole was makes the mainboard be difficult for appearing warping because the atress is uneven.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (12)

1. A circuit board expansion assembly, comprising: the system comprises a mainboard and a first expansion card;

the main board is provided with a first electronic element and a plurality of expansion card connectors, and the expansion card connectors are electrically connected with the first electronic element;

the first expansion card is provided with a second electronic element and a plurality of mainboard connectors, and the mainboard connectors are electrically connected with the second electronic element;

the first expansion card is positioned above the mainboard, and the mainboard connector is positioned at one side of the first expansion card close to the mainboard and is connected with the expansion card connectors in a one-to-one correspondence manner.

2. The circuit board expansion assembly of claim 1, wherein: the main board is also provided with a plurality of first mounting holes; a plurality of second mounting holes are formed in the first expansion card, and the second mounting holes correspond to the first mounting holes one to one.

3. The circuit board expansion assembly of claim 2, wherein: the mainboard fixing frame is also included; the mainboard fixing frame is arranged between the mainboard and the first expansion card;

a plurality of limiting through holes are formed in the mainboard fixing frame and correspond to the expansion card connectors one by one; the main board connector penetrates through the limiting through hole to be connected with the expansion card connector.

4. The circuit board expansion assembly of claim 3, wherein: the mainboard fixing frame is provided with a plurality of first fixing parts, a plurality of first fixing parts are in one-to-one correspondence with the first mounting holes and the second mounting holes.

5. The circuit board expansion assembly of claim 3, wherein: the first fixing piece is a hollow riveting column and is provided with a first connecting part for fixing the first expansion card and a second connecting part for fixing the main board; the first connecting portion and the second connecting portion are communicated with each other, and a connecting piece is inserted into and connected with the main board and the first expansion card.

6. The circuit board expansion assembly of claim 3, wherein: the mainboard fixing frame is also provided with a plurality of second fixing pieces; a plurality of third mounting holes are formed in the main board; the second fixing pieces correspond to the third mounting holes one to one.

7. The circuit board expansion assembly of claim 3, wherein: the main board fixing frame comprises a limiting plate and a vertical plate; the vertical plate is arranged around the limiting plate, extends from the limiting plate to the direction of the main board, and is connected with the limiting plate to form an accommodating space for accommodating the main board; the limiting plate is provided with the limiting through hole.

8. The circuit board expansion assembly of claim 7, wherein: and vent holes are formed in the two oppositely arranged vertical plates.

9. The circuit board expansion assembly of claim 7, wherein: the mainboard fixing frame also comprises a connecting plate; the connecting plate is arranged on one side, far away from the limiting plate, of the vertical plate and extends in the direction of the vertical plate back to the limiting plate, and a screw hole is formed in the connecting plate and corresponds to the mounting hole of the case.

10. The circuit board expansion assembly of claim 3, wherein: the main board is also provided with a plurality of heat dissipation device mounting holes; the mainboard fixing frame is also provided with a plurality of third fixing parts, and the third fixing parts are in one-to-one correspondence with the heat dissipation device mounting holes.

11. The circuit board expansion assembly of claim 1, wherein: the system also comprises a second expansion card and a patch panel; the second expansion card is connected with the main board through the adapter board;

the second expansion card is provided with a plurality of first adapters;

a plurality of second adapters are arranged on one side of the adapter plate, which is far away from the main plate, and the second adapters are connected with the first adapters in a one-to-one correspondence manner;

and a plurality of third adapters are arranged on one side of the adapter plate close to the main board, and the plurality of third adapters are connected with the plurality of expansion card connectors in a one-to-one correspondence manner.

12. A hard disk detection device is characterized in that: comprising a chassis and a circuit board extension assembly according to any one of claims 1 to 11 arranged inside the chassis.

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