CN215729548U - Single board assembly, server unit and server - Google Patents

Abstract

The application provides a veneer component, a server unit and a server. The veneer assembly comprises: a base; the plurality of single boards are all arranged on the base; each single board in the multiple single boards comprises a PCB substrate, connectors inserted in the first direction and a guide piece extending in the first direction are arranged on the PCB substrate, and the guide piece is used for guiding the connectors on the same single board; the PCB substrate of the first single board is provided with a first connecting hole; the first connecting hole of the first single plate is sleeved on the first connecting column of the base, so that the first single plate is arranged on the base; and a gap extending along the second direction is formed between the first connecting hole and the first connecting column, so that the first single plate can move along the second direction relative to the base, and the second direction is perpendicular to the first direction. The problem of falling the needle can be avoided appearing in the connector to this application.

Description

Single board assembly, server unit and server

Technical Field

The present application relates to the field of computer technologies, and in particular, to a board assembly, a server unit, and a server.

Background

The single board is a common component in the server, and can be implemented in various forms such as a system motherboard, a power management board, a network data exchange board, and the like. The single board is provided with a connector, and the single board can be plugged on other electrical elements (for example, another single board) through the connector.

Take a blade server as an example. The blade server includes a subrack and a plurality of "blades" mounted on the subrack. The blade is provided with a cross inserting plate (one implementation form of a single plate), and after the blade is installed on a machine frame, the cross inserting plate of the blade is inserted into a back plate (another implementation form of the single plate) of the machine frame. In the prior art, the blade usually only comprises one transverse insertion plate, so that only one transverse insertion plate needs to be butted with one back plate in the installation process of the blade. With the development of computer technology, currently, a plurality of horizontal plug-in boards may exist in one blade, and therefore, when the blade is installed to a machine frame, a plurality of horizontal plug-in boards may be plugged into a plurality of backplanes.

However, in the manufacturing process of the blade, manufacturing errors and mounting errors inevitably exist. When the blade has a plurality of lateral insertion plates, manufacturing errors and mounting errors of the plurality of lateral insertion plates may be accumulated with each other, and a part of the lateral insertion plates may not be precisely butted against the back plate, thereby causing a problem of back-stitching of the connector.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present application provide a single board assembly, a server unit and a server, and the present application is described below in various aspects, and embodiments and advantages of the following aspects may be mutually referenced.

In a first aspect, an embodiment of the present application is directed to provide a veneer assembly, including: a base; the plurality of single boards are all arranged on the base; each of the plurality of boards includes a Printed Circuit Board (PCB) substrate, the PCB substrate is provided with a connector inserted along a first direction and a guide extending along the first direction, and the guide is used to guide the connector on the same board; the PCB substrate of the first single board is provided with a first connecting hole; the first connecting hole of the first single plate is sleeved on the first connecting column of the base, so that the first single plate is arranged on the base; and a gap extending along the second direction is formed between the first connecting hole and the first connecting column, so that the first single plate can move along the second direction relative to the base, and the second direction is perpendicular to the first direction.

According to the embodiment of the application, the first single board can float along the second direction relative to the base, and the floating can compensate the manufacturing/installation error of the single board assembly, so that the precise butt joint of the connector of the first single board is realized, and the problem of needle falling is avoided.

In some embodiments, the PCB substrate of the first board is provided with a plurality of first connection holes, the base is provided with a plurality of first connection posts, and the plurality of first connection holes are sleeved on the plurality of first connection posts in a one-to-one correspondence manner.

According to the embodiment of the application, the first veneer is beneficial to being stably installed on the base.

In some embodiments, the first connection post is a cylinder and the first connection hole is a kidney-shaped hole.

In some embodiments, the gap has a length in the second direction of 1 to 4 mm; or the length of the gap along the second direction is 0.35-0.55 times of the outer diameter of the connecting column.

In some embodiments, along the extending direction of the first connecting column, one end of the first connecting column is connected to the first surface of the base, and the other end of the first connecting column is connected to the first limiting member; the first limiting piece is used for limiting the PCB substrate of the first single board between the first surface and the first limiting piece, and the distance between the first surface and the first limiting piece is larger than the thickness of the PCB substrate of the first single board. The embodiment of the application is beneficial to reducing the resistance of the first single plate in the floating process.

In some embodiments, the first retaining member is a threaded fastener that is threadedly coupled to the first connecting post.

In some embodiments, the plurality of single boards further includes a second single board, wherein the PCB substrate of the first single board and the PCB substrate of the second single board are disposed at intervals along the extending direction of the first connecting column. The method and the device are beneficial to increasing the board distribution area of the single board assembly.

In some embodiments, the direction of extension of the first connecting post is perpendicular or parallel to the first direction; and/or the PCB substrate of the first single board is perpendicular to the extending direction of the first connecting column.

In a second aspect, an embodiment of the present application is configured to provide a server unit, where the server unit includes the board component provided in any embodiment of the first aspect of the present application. The beneficial effects that can be achieved by the second aspect can refer to the beneficial effects of any implementation manner of the first aspect of the present application, and are not described herein again.

In a third aspect, an embodiment of the present application is directed to provide a server, including a backplane assembly and a server unit plugged in the backplane assembly, where the backplane assembly includes a single board assembly provided in any embodiment of the first aspect of the present application; alternatively, the server unit includes the single board component provided in any embodiment of the first aspect of the present application. The beneficial effects that can be achieved by the third aspect can refer to the beneficial effects of any one of the embodiments of the first aspect of the present application, and are not described herein again.

Drawings

FIG. 1 is an exemplary block diagram of a blade server provided by an embodiment of the present application;

FIG. 2 is a schematic view of a blade mounting arrangement provided in an embodiment of the present application;

fig. 3 is an exemplary structural diagram of a board assembly provided in an embodiment of the present application;

fig. 4a to fig. 4c are schematic diagrams illustrating an installation manner of a floating veneer according to an embodiment of the present application;

fig. 5 is a schematic diagram of another single-board floating manner provided in the present application;

fig. 6 is a schematic diagram of another single-plate floating manner provided in the present application.

Detailed Description

Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The embodiment of the application provides a veneer component for avoiding the problem of needle falling when a plurality of veneers are plugged simultaneously. In this embodiment, the single board assembly is applied to a blade server (or "plug-in device"), but the present application is not limited thereto. In other embodiments, the board assembly may be applied to other electronic devices such as a rack server, a display, a PC, and the like, as long as there is a need for docking a plurality of boards.

Fig. 1 is an exemplary block diagram of a blade server provided in an embodiment of the present application. Referring to FIG. 1, a blade server includes a subrack and a plurality of "blades" inserted on the subrack. Each blade (as a server unit) acts as an independent computer, can run an operating system, and has certain computing functions. After a plurality of blades in the blade server are interconnected through upper-layer software, more complex calculation can be completed. For example, IT blade servers may perform complex network data exchange functions. In each figure, the X direction is the longitudinal direction of the server, the Y direction is the width direction of the server, and the Z direction is the thickness direction of the server. Wherein, the X direction, the Y direction and the Z direction are vertical pairwise.

Fig. 2 is a schematic view of a blade mounting manner. Referring to fig. 2, the blade includes a veneer assembly 1, and the veneer assembly 1 includes a base 14 and a plurality of cross insertion boards (specifically, a cross insertion board 11, a cross insertion board 12, a cross insertion board 13) disposed on the base 14. Illustratively, the horizontal plug board 11 is a system motherboard of a blade, and by arranging the horizontal plug board 11, the blade can have an independent computing function; the cross inserting plate 12 is a power management plate of the blade and is used for managing a power supply (not shown) of the blade; the horizontal insertion board 13 is a data exchange board of the blade, and is used for implementing a network data exchange function of the blade.

The single board assembly 1 is mounted on a server subrack 2. A plurality of backplates (specifically, the backplane 31, the backplane 32, and the backplane 33) are arranged on the machine frame 2, and a plurality of horizontal flashboards of the veneer assembly 1 are inserted on the backplates in a one-to-one correspondence along a length direction (shown in the figure, X direction) (therefore, X direction is also referred to as "plugging direction"). Specifically, the horizontal inserting plate 11 is inserted on the back plate 31, the horizontal inserting plate 12 is inserted on the back plate 32, and the horizontal inserting plate 13 is inserted on the back plate 33. In this embodiment, the subrack 2 and the multiple backplanes disposed on the subrack 2 may be collectively referred to as a backplane assembly. In addition, in the present embodiment, the horizontal insertion plate and the back plate which are inserted into each other form a pair of single plates, for example, the horizontal insertion plate 13 and the back plate 33 form a pair of single plates. It can be understood that a plurality of pairs of single boards have the same plugging direction (X direction, as the first direction).

The backboard is provided with various communication interfaces, such as PCIe interfaces, VGA interfaces, redundant power supply interfaces and the like. After each cross plug board of the blade is plugged in the backboard, the blade can realize communication connection with external equipment through a communication interface on the backboard. For example, the communication connection with other blades or an upper computer is realized through a PCIe interface, or the communication connection with a display is realized through a VGA interface.

Next, the structure of the single board will be exemplarily described by taking the cross insertion board 11 and the back board 31 as an example. Referring to fig. 2, the horizontal insertion plate 11 includes a PCB substrate 111, a connector 112 is disposed on the PCB substrate 111, and the connector 112 has a jack; the back plate 31 includes a PCB substrate 311, a connector 312 is disposed on the PCB substrate 311, and the connector 312 has pins. The pins of the connector 312 may be inserted into the receptacles of the connector 112 in the plugging direction, thereby causing the crossbar 11 to be plugged onto the backplane 31.

Taking the horizontal insertion plate 11 and the back plate 31 as an example, the insertion process of a pair of single plates is exemplarily described. First, the base 14 is pushed in the plugging direction by the pull tab 141 on the base 14 (therefore, the base 14 is also referred to as a "pull tab strip"). When the base 14 is pushed, the horizontal inserting plate 11 is driven to move towards the direction of the back plate 31. Optionally, the base 14 is provided with a guide strip 142 extending along the plugging direction, and the frame 2 is provided with a guide slot 21 corresponding to the guide strip 142. Under the guiding action of the guiding strip 142/guiding groove 21, the moving direction of the base 14 can be limited to the plugging direction, so that the guiding can be provided for the plugging process of the connector. In this embodiment, the guide strip 142/guide groove 21 structure is referred to as a primary guide structure.

When the lateral flashboard 11 is moved to a position close to the back plate 31, the guide pins 313 on the back plate 31 can be inserted into the guide sleeves 113 (as guides) on the lateral flashboard 11. The guide pin 313 and the guide sleeve 113 both extend in the plugging direction for further guiding the plugging process of the connector. In this embodiment, the guide pin 313/guide sleeve 113 structure is referred to as a secondary guide structure. Continuing to push the base 14, the pins of the connector 312 can be inserted into the receptacles of the connector 112 under the guiding action of the guiding pin 313/guiding sleeve 113 structure, so that the cross-insertion plate 13 is inserted onto the back plate 33.

The plugging process of the two pairs of single boards (i.e. the horizontal plug board 12 and the back board 32, and the horizontal plug board 13 and the back board 33) may refer to the plugging process of the horizontal plug board 11 and the back board 31, which is not described in detail.

With the development of computer technology, the speed of connectors is higher and higher, the tolerance capability of the connectors is smaller and smaller, and the requirement of the precision (matching) of the plugging depth is higher and higher. In the manufacturing process of the veneer assembly 1, manufacturing errors and mounting errors inevitably occur. When the veneer assembly 1 has a plurality of lateral insert boards, manufacturing errors and mounting errors of the plurality of lateral insert boards are accumulated with each other. Thus, during the mounting of the veneer assembly 1 (i.e., during the mounting of the blades), part of the cross-blade may not be able to be precisely butted against the backplane, thereby causing a problem of connector back-stitching.

To this end, in this embodiment, at least one of the plurality of cross boards of the veneer assembly 1 includes a floating cross board in floating connection with the base 14. The floating lateral insert plate can be displaced in the width direction (the illustrated Y direction, as the second direction) with respect to the base 14. In this way, during the plugging process of the horizontal plug board, the floating horizontal plug board can compensate the manufacturing/installation error of the single board assembly 1 through the displacement, so that the problem of needle falling of the connector is avoided.

In the present embodiment, the horizontal insertion plate 13 is provided as a floating horizontal insertion plate (as a first single plate), but the present application is not limited thereto. In other embodiments, one or more of the crosspiece plate 11, the crosspiece plate 12 and the crosspiece plate 13 may be provided as a floating crosspiece plate.

Fig. 3 is an exemplary structural diagram of the single board assembly 1 provided in this embodiment. Referring to fig. 3, the lateral insert plate 11 and the lateral insert plate 12 are fixedly installed on the bottom plate 143 of the base 14. For example, the PCB substrates of the lateral insertion plate 11 and the lateral insertion plate 12 are fixed to the bottom plate 143 by caulking.

The cross insertion plate 13 is mounted on the base 14 by a bracket 40. The bracket 40 includes a base frame 41 and a plurality of pillars 42 provided on the base frame 41. The chassis 41 of the bracket 40 is secured to the base plate 143 of the base 14 (e.g., to the base plate 143 by threaded fasteners). The support column 42 extends in the thickness direction (the illustrated Z direction, which is a third direction). The cross gate 13 is mounted to the bracket 40 (and thus to the base 14) by the upper ends of the legs 42.

Fig. 4a to 4c show an exemplary connection structure of the lateral insertion plate 13 and the support column 42. Wherein fig. 4a is an exploded view of the connection structure, fig. 4b is a top view (with screws removed) of the connection structure, and fig. 4c is a cross-sectional view of the connection structure. Referring to fig. 4a, the upper end of the strut 42 is a stepped shaft structure. Wherein, the upper end of the step shaft is a small-diameter end, and the lower end is a large-diameter end. The small-diameter end of the step shaft forms a connecting post 421 for connecting the lateral insert plate 13, and the step surface 422 of the step shaft forms a support surface (as a first surface) for supporting the lateral insert plate 13.

The PCB substrate 131 of the horizontal insertion plate 13 is provided with a connection hole 131a, and the connection hole 131a of the horizontal insertion plate 13 is sleeved on the connection post 421, so that the horizontal insertion plate 13 is connected to the bracket 40. It can be understood that, when the PCB substrate 131 is mounted on the connection post 421, the plane of the PCB substrate 131 is perpendicular to the extending direction (i.e., Z direction) of the connection post 421.

Referring to fig. 4b, the connection hole 131a on the PCB substrate 131 is a kidney-shaped hole. Wherein, the length L of the connection hole 131a is greater than the diameter D of the connection column 421. Thus, a gap a exists between the connection hole 131a and the connection post 421 in the width direction (shown in the Y direction), so that the lateral insert plate 13 can generate a displacement in the width direction with respect to the connection post 421 (and the base 14), which can compensate for a manufacturing/mounting error of the veneer assembly 1.

Specifically, referring to fig. 4b in combination with fig. 2, during the installation of the single board assembly 1, if the connectors 132 of the cross board 13 and the connectors 332 of the back board 33 cannot be aligned precisely in the plugging direction due to the manufacturing/installation error, the position of the cross board 13 may be adjusted in the width direction so that the connectors 132 and the connectors 332 are aligned with each other. Alternatively, during the position adjustment of the lateral inserting plate 13, the guide sleeve 133 of the lateral inserting plate 13 may be first aligned with the guide pin 333 of the back plate 33 in the inserting direction. After the guide sleeve 133 is aligned with the guide pin 333, the connector 132 and the connector 332 may be aligned with each other. Then, under the guiding action of the guide pin 333/guide sleeve 133, the precise butt joint of the connector 132 and the connector 332 is realized, so as to avoid the problem of needle falling of the connector.

Alternatively, referring to FIG. 4b, the gap A has a dimension of 1-4 mm (e.g., 2.3 mm); alternatively, the size of the gap A is 0.35 to 0.55 times (e.g., 0.46 times) the diameter D of the connecting column 421. The above-mentioned dimension of the clearance a can simplify the position adjustment process of the lateral insert plate 13 while satisfying the compensation of the manufacturing/mounting error. Here, the size of the gap a is a difference between the length L of the connection hole 131a and the diameter D of the connection post 421. That is, when there is a gap on both sides of the connection stud 421 (gap a1 and gap a2, respectively), the size of gap a is the sum of the sizes of gap a1 and gap a 2.

Optionally, the width W of the kidney-shaped hole is slightly larger than the diameter D of the connecting column 421, so as to reduce the resistance of the horizontal inserting plate 13 during position adjustment. For example, the difference between the width W and the diameter D is 0.5 mm.

In this embodiment, the length direction of the connection hole 131a is the Y direction to achieve the floating of the lateral insert plate 13 in the Y direction, but the present application is not limited thereto. For example, in another embodiment, the length direction of the connection hole 131a is the X direction to achieve the floating of the horizontal insertion plate 13 in the X direction.

Referring to fig. 4a and 4c, the upper end of the connection column 421 is connected to the stopper 50. The stopper 50 serves to limit the PCB substrate 131 of the cross pin 13 between the step 422 and the stopper 50, thereby securely connecting the cross pin 13 to the support post 42. Optionally, referring to fig. 4c, a distance H between the limiting member 50 and the step surface 422 is greater than a thickness T of the PCB substrate 131 of the horizontal insertion plate 13, so as to achieve the purpose of further reducing resistance of the horizontal insertion plate 13 during position adjustment. For example, the difference between the distance H and the thickness T is 0.5 mm.

In the present embodiment, the position-limiting member 50 is a screw (serving as a threaded fastener). An internal thread is arranged on the connecting column 421, and an external thread on the screw is screwed with the connecting column 421 through the internal thread. The diameter of the screw head 51 is larger than the width W of the connection hole 131a so that the PCB substrate 131 of the cross-insertion plate 13 can be confined between the screw head and the step 422. Since the screw is a standard component, the manufacturing cost of the single plate assembly 1 can be reduced when the screw is used as the stopper 50. However, the present application is not limited thereto, and in other embodiments, other structures may be adopted as the limiting member, for example, a pin inserted into the connecting column 421 in the width direction is adopted as the limiting member.

Referring to fig. 4a, in the embodiment, the connecting column 421 is a cylinder, and the connecting hole 131a is a kidney-shaped hole, but the application is not limited thereto. In other embodiments, the connection post 421 and the connection hole 131a may be provided in other shapes, for example, the connection post 421 may be a square post, and the connection hole 131a may be a rectangular hole, as long as there is a gap between the connection post 421 and the connection hole 131a in the width direction.

Referring to fig. 3 and 4a in combination, in this embodiment, the number of the connection posts 421 (a part of the support post 42 in fig. 3) and the number of the connection holes 131a are respectively 6, and the 6 connection holes 131a are sleeved on the 6 connection posts 421 in a one-to-one correspondence manner. This arrangement facilitates stable attachment of the cross gate 13 to the bracket 40, but the present application is not limited thereto. In other embodiments, the number of connecting studs 421/connecting holes 131a can be other numbers, such as 1, 3, etc.

Referring to fig. 3, in the present embodiment, the PCB substrates of each horizontal insertion plate are parallel to each other (both parallel to the bottom plate 143 of the substrate). Since the horizontal insertion plate 13 is supported at the upper end of the support column 42, the PCB substrate 131 of the horizontal insertion plate 13 is located in a different plane from the PCB substrates of the other horizontal insertion plates. That is, along the extending direction of the supporting posts 42 (i.e. the extending direction of the connecting posts 421, shown as Z direction), the PCB substrate 131 of the horizontal inserting plate 13 and the PCB substrate 111 of the horizontal inserting plate 11 are arranged at intervals, so that the PCB substrate 131 of the horizontal inserting plate 13 and the PCB substrate 111 of the horizontal inserting plate 11 can be located in the spaces with different heights, thereby increasing the board distribution area of the blade. Alternatively, the connector 132 of the cross board 13 is disposed on the lower surface of the PCB substrate 131 thereof, so that the structural design of the single board assembly 1 can be made more compact.

In the present embodiment, the extending direction of the support post 42 is the thickness direction (shown as the Z direction), so that the plane of the PCB substrate 131 is parallel to the plugging direction, but the present application is not limited thereto. For example, in other embodiments, the extending direction of the support posts 42 is the plugging direction (shown as X direction), so that the plane of the PCB substrate 131 is perpendicular to the plugging direction (i.e. the PCB substrate 131 is disposed facing the back plate 33).

The above describes an exemplary structure in which the present embodiment provides a single board assembly, a blade, and a server, but the present application is not limited thereto, and other modifications may be made by those skilled in the art.

For example, in the present embodiment, a pair of single boards inserted into each other are fixed by a back board, and the horizontal insertion board floats. In other embodiments, a mode that the back plate floats and the transverse inserting plate is fixed can also be adopted. For example, a waist-shaped hole is formed in the PCB substrate of the back plate, a connecting column is arranged on the machine frame, and the waist-shaped hole of the back plate is sleeved on the connecting column of the machine frame so as to realize the floating connection of the back plate and the machine frame.

In addition, the floating single plates can be different from each other in different single plate pairs. For example, in the single plate pair composed of the horizontal inserting plate 11 and the back plate 31, the horizontal inserting plate 11 may be used as a floating single plate, and the back plate 31 may be used as a fixed single plate; in the single plate pair composed of the horizontal inserting plate 12 and the back plate 32, the back plate 32 can be used as a floating single plate, and the horizontal inserting plate 12 can be used as a fixed single plate. By the flexible configuration of each single board, the adaptability and the competitiveness of the product can be improved.

For another example, in the present embodiment, the floating direction of the single plate is mainly one direction (i.e., Y direction), but the present application is not limited thereto. In other embodiments, the single plate may float in two or three directions. For example, in another embodiment, the kidney-shaped hole has a gap a between the connecting column in both the width direction and the length direction, so that the single plate can float in both the width direction and the length direction.

For another example, in the present embodiment, the bracket and the base are fixedly connected, but the present application is not limited thereto. In other embodiments, the support may be floatingly coupled to the base. For example, a waist-shaped hole is formed in the bottom frame of the support, a connecting column is arranged on the bottom plate of the base, and the waist-shaped hole of the support is sleeved on the connecting column of the base so as to realize floating connection between the support and the base. In this embodiment, the manufacturing/installation error of the veneer assembly can also be compensated by the floating amount of the bracket.

Compared with other modes for compensating the manufacturing error of the single plate assembly, the embodiment has the advantages of not influencing the utilization rate of the single plate, not changing the layout of the single plate and having simple structure. The following is compared separately with two other error compensation approaches of the single board assembly.

Fig. 5 shows the first way. Specifically, fig. 5 provides a fixing assembly including a fixing bracket, a fixing plate, a supporter, and an elastic member. The fixed support is connected with the support, the elastic object is arranged between the fixed support and the support, and the floating connector is fixed on the fixed assembly through the fixed plate. The mode can solve the problem of poor contact of the floating connector caused by machining errors. However, in the scheme, the guiding capacity of the connector is improved, the occupied area of the single board is large, and the availability of the layout of the single board is low.

Compared with the mode, the floating of the single board is realized by arranging the waist-shaped hole on the PCB substrate of the single board, the occupied area of the single board is obviously reduced, and the utilization rate of the single board is not influenced.

Fig. 6 shows a second approach. Specifically, fig. 6 provides a computer device comprising a first single board, a second single board, a floating assembly, and a handle bar. The floating assembly comprises a sliding module and a fixed seat, the first single plate is fixed on the sliding module, the sliding module is connected with the fixed seat in a sliding mode, and the fixed seat is fixed on the handle strip. The first single board is provided with a first connector, the second single board is provided with a second connector, and the first single board and the second single board are in butt joint through the first connector and the second connector. When the first connector and the second connector are dislocated, the first single plate slides along the sliding module in the first direction for reducing the butt joint dislocation to complete the butt joint, so that the problem of needle falling caused by forced butt joint of the connectors can be prevented. In the mode, the floating alignment of the connector is realized based on an additional floating mechanism, and the floating mechanism is complex in structure, difficult to assemble and high in cost.

Compared with the mode, the floating of the single board is realized by arranging the waist-shaped hole on the PCB substrate of the single board, the layout of the connector of the single board is not changed, an additional floating mechanism is not added, and the manufacturing cost can be obviously reduced.

Claims (10)

1. A veneer assembly, comprising:

a base;

the plurality of single boards are all arranged on the base; each single board in the multiple single boards comprises a PCB substrate, the PCB substrate is provided with a connector inserted along a first direction and a guide part extending along the first direction, and the guide part is used for guiding the connector on the same single board;

the plurality of single boards comprise a first single board, and a PCB substrate of the first single board is provided with a first connecting hole; the first connecting hole of the first single plate is sleeved on the first connecting column of the base, so that the first single plate is installed on the base; a gap extending along a second direction is formed between the first connection hole and the first connection column, so that the first single plate can move along the second direction relative to the base, and the second direction is perpendicular to the first direction.

2. The board assembly according to claim 1, wherein the PCB substrate of the first board has a plurality of first connection holes, the base has a plurality of first connection posts, and the plurality of first connection holes are disposed on the plurality of first connection posts in a one-to-one correspondence manner.

3. The veneer assembly according to claim 1, wherein said first connecting post is a cylinder and said first connecting hole is a kidney-shaped hole.

4. The veneer assembly according to claim 1, wherein the length of said gap in said second direction is 1 to 4 mm; or the length of the gap in the second direction is 0.35-0.55 times of the outer diameter of the connecting column.

5. The veneer assembly according to claim 1, wherein along the extending direction of the first connecting column, one end of the first connecting column is connected to the first surface of the base, and the other end of the first connecting column is connected to the first limiting member;

the first limiting member is configured to limit the PCB substrate of the first single board between the first surface and the first limiting member, and a distance between the first surface and the first limiting member is greater than a thickness of the PCB substrate of the first single board.

6. The veneer assembly according to claim 5, wherein said first retaining member is a threaded fastener threadedly connected to said first connecting post.

7. The veneer assembly according to claim 1, wherein the plurality of veneers further comprises a second veneer, wherein the PCB substrate of the first veneer and the PCB substrate of the second veneer are arranged at intervals along the extending direction of the first connecting column.

8. The veneer assembly according to claim 1, wherein the extending direction of the first connecting column is perpendicular or parallel to the first direction; and/or the PCB substrate of the first single board is perpendicular to the extending direction of the first connecting column.

9. A server unit, characterized in that the server unit comprises a single board assembly according to any one of claims 1 to 8.

10. A server, comprising a backplane assembly and a server unit plugged in the backplane assembly, wherein the backplane assembly comprises the single board assembly according to any one of claims 1 to 8; alternatively, the server unit comprises a single board assembly according to any one of claims 1 to 8.

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