WO2016078462A1

WO2016078462A1 - Backplane system, centralized exchange equipment and method for backplane connection and fixation

Info

Publication number: WO2016078462A1
Application number: PCT/CN2015/088060
Authority: WO
Inventors: 马德征
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-19
Filing date: 2015-08-25
Publication date: 2016-05-26
Also published as: CN105682352A

Abstract

Disclosed in the present invention are a backplane system, centralized exchange equipment and a method for backplane connection and fixation. A first engagement mechanism is arranged on the lower end of an upper backplane, a second engagement mechanism is arranged on the upper end of a lower backplane, the upper backplane and the lower backplane are engaged and connected with each other through the first engagement mechanism and the second engagement mechanism; during assembly, locating holes having corresponding locations are further formed on the first engagement mechanism and the second engagement mechanism, and then identical locating members are used to penetrate through the locating holes on the upper backplane and the lower backplane at the same time to fix the upper backplane and the lower backplane on a frame. During assembly, the upper backplane and the lower backplane in the backplane system of the present invention can be connected with each other through the mutually configured engagement mechanisms and then fixed on the frame through the same locating members; thus errors in assembly can be reduced, the problem is avoided that a card connector and a connector on the backplane cannot be perfectly aligned during exchange/intersection, so as to cause damages to pins and sockets of the connectors and further to equipment functions; the qualified rate of products is greatly raised during production, production efficiency is improved, and production cost is lowered.

Description

Backplane system, centralized switching device and backplane connection and fixing method

Technical field

The present invention relates to the field of communications, and in particular, to a backplane system, a centralized switching device, and a backplane connection and fixing method in the communication field.

Background technique

Centralized switching/crossing equipment is mainly used in the fields of OTN, PTN, and IP. With the rapid development of the Internet and 3G\4G services, the market has more and more demand for the scheduling capacity of switching equipment. At present, centralized switching/crossing devices mainly implement high-speed channel interconnection through backplane wiring. The larger the backplane size, the greater the number of wires, and the greater the number of cards, the greater the scheduling capacity of the device. However, the PCB manufacturer's processing capacity is limited, and the PCB cannot be oversized. Many manufacturers in the industry have adopted multiple backplane separation processing and finally assembled into the rack structure. FIG. 1 shows a single-sided device structure composed of two back plates, and the two back plates are named as an upper back plate 1 and a lower back plate 2, respectively. For the double-sided backboard, the capacity is doubled, and the structure of the other side is basically the same as that in FIG. 1. Here, a single side is taken as an example for brief introduction. In order for the line cards on the two separate backplanes to communicate with each other, the switch/crossover boards must be bridged across the two backplanes, and the switch/crossboards are vertically inserted into the backplane. Figure 2 shows the basic outline structure of the switch/cross board 3. The switch/cross board 3 is a single PCB structure, and the connector position is guaranteed in a vertical direction. However, after the two separate backplanes are assembled to the frame, the relative position is mainly limited by the structural positioning accuracy, and the connector of the exchange/cross-board 3 interconnection cannot be completely in a vertical direction, which may cause assembly errors. Specifically, as shown in FIG. 3, there is an error in the horizontal direction after assembly; as shown in FIG. 4, there is an error in the vertical direction after assembly, and there are cases where there are assembly errors in both the horizontal and vertical directions. If the switch/cross card 3 is plugged and unplugged on the device to be assembled, it is easy to accurately align the switch/cross-board connector 3 and the backplane connector, causing damage to the connector pins and sockets, resulting in device function. Damage, in production, will also greatly affect product yield, reduce production efficiency, and increase production costs. One of the main factors for the above error is that there is no direct connection between the upper back plate 1 and the lower back plate 2 and the upper and lower back plates 2 are fixed by respective positioning pins; resulting in assembly errors easily after assembly.

Summary of the invention

The main technical problem to be solved by the embodiments of the present invention is to provide a backplane system, a centralized switching device, and a backplane connection and fixing method, which solves the problem that assembly is prone to assembly errors due to no connection between the existing backplanes.

In order to solve the above technical problem, an embodiment of the present invention provides a backplane system, including an upper backboard and a lower backplane, wherein a lower end of the upper backplane is provided with a first engaging mechanism, and an upper end of the lower backboard is provided with a first The second bite mechanism, the upper back plate and the lower back plate are snap-fit connected by the first engaging mechanism and the second engaging mechanism.

In an embodiment of the present invention, the first engaging mechanism includes a first limiting groove, the groove depth of the first limiting groove is smaller than the thickness of the upper back plate; and the second engaging mechanism The first protruding position corresponding to the first limiting groove is disposed; the first protruding portion is fastened into the first limiting groove to realize the first engaging mechanism and the second a nip joint of the occlusion mechanism; and/or, the second occlusion mechanism includes a second limiting groove, the groove depth of the second limiting groove is smaller than a thickness of the lower back plate; the first occlusion mechanism a second boss having a position and a size corresponding to the second limiting groove, the second boss being fastened into the second limiting groove to realize the first engaging mechanism and the second engaging The bite connection of the mechanism.

In an embodiment of the invention, when the first engaging mechanism includes a first limiting groove, the first limiting groove is disposed on a front surface of the upper back plate; and the second engaging mechanism comprises The first boss is disposed on the front surface of the lower back plate; when the second engaging mechanism includes the second limiting groove, the second limiting groove is disposed on the front surface of the lower back plate; The second boss included in the first engaging mechanism is disposed on the front surface of the upper back plate.

In an embodiment of the present invention, when the first engaging mechanism includes the first limiting groove, the thickness of the first boss included in the second engaging mechanism is less than or equal to the thickness of the first limiting groove. Depth; when the second engaging mechanism includes the second limiting groove, the thickness of the second boss included in the first engaging mechanism is less than or equal to the depth of the second limiting groove.

In an embodiment of the present invention, when the first engaging mechanism includes only the first limiting groove, the first limiting groove width is equal to the upper back plate width; the second engaging mechanism corresponds to Included only in the first boss, the width of the first boss is equal to the width of the lower back plate; when the second meshing mechanism includes only the second limiting groove, the second limit groove width And corresponding to the width of the lower back plate; the first engaging mechanism correspondingly includes only the second boss, and the width of the second boss is equal to the width of the upper back plate.

In an embodiment of the present invention, when the first engaging mechanism includes the first limiting groove, the groove depth of the first limiting groove is one-half of the thickness of the upper back plate; When the second engaging mechanism includes the second limiting groove, the groove depth of the second limiting groove is one-half of the thickness of the lower back plate.

In order to solve the above problems, an embodiment of the present invention further provides a centralized switching device, including a rack, a positioning member, and a backplane system as described above, wherein the first engaging mechanism and the second engaging mechanism are respectively configured And a second positioning hole corresponding to the first positioning hole and the second positioning hole; the positioning member is in the After the upper back plate and the lower back plate are snap-fitted by the first engaging mechanism and the second engaging mechanism, pass through the first positioning hole, the second positioning hole, and the third on the frame A positioning hole fit secures the upper back plate and the lower back plate to the frame.

In order to solve the above problems, an embodiment of the present invention further provides a backplane connection method, including: providing a first occlusion mechanism at a lower end of the upper back panel, and a second occlusion mechanism at an upper end of the lower back panel; And the lower back plate is snap-connected by the first engaging mechanism and the second engaging mechanism.

In order to solve the above problem, an embodiment of the present invention further provides a method for fixing a backboard, comprising: providing a first engaging mechanism at a lower end of the upper back panel, and a second engaging mechanism at an upper end of the lower back panel, respectively a first positioning hole and a second positioning hole corresponding to a position on a second engaging mechanism; a third positioning hole corresponding to the first positioning hole and the second positioning hole in the frame Providing a positioning member; the positioning member passes through the first positioning hole and the second after the upper back plate and the lower back plate are engaged by the first engaging mechanism and the second engaging mechanism Positioning the holes and cooperating with a third positioning hole on the frame to fix the upper back plate and the lower back plate to the frame.

The beneficial effects of the embodiments of the present invention are:

The backplane system, the centralized switching device, and the backplane connection and fixing method provided by the embodiments of the present invention have a first engaging mechanism at a lower end of the upper backboard, and a second engaging mechanism, an upper backboard and an upper back of the lower backboard. The lower back plate is engaged by the first engaging mechanism and the second engaging mechanism; when the back plate is assembled, the positioning holes corresponding to the positions are further disposed on the first engaging structure and the second engaging structure, and then the same positioning member is simultaneously The upper back plate and the lower back plate are fixed to the frame through positioning holes on the upper back plate and the lower back plate. It can be seen that the upper back board and the lower back board in the embodiment of the present invention can be connected to each other through the same positioning member after being connected by the mutually configured engaging mechanism, thereby reducing assembly errors and avoiding exchange/cross board connection. The connector on the backplane and the backplane cannot be precisely aligned to cause damage to the connector pins and sockets, which may result in damage to the function of the device, which can greatly improve the product qualification rate, improve production efficiency, and reduce production cost in production.

DRAWINGS

Figure 1 is a schematic view showing an ideal assembly structure of a single-sided and a lower back plate;

2 is a schematic structural diagram of an exchange (cross) board;

Figure 3 is a schematic diagram 1 showing the error after assembly of the upper and lower back plates;

Figure 4 is a schematic diagram 2 showing the error after assembly of the upper and lower back plates;

FIG. 5 is a schematic structural diagram 1 of an upper and a lower back board according to Embodiment 1 of the present invention; FIG.

6 is a schematic structural view 2 of the upper and lower back plates according to Embodiment 1 of the present invention;

7 is a schematic structural view 3 of the upper and lower back plates according to Embodiment 1 of the present invention;

FIG. 8 is a schematic view showing the assembly of the upper and lower back plates according to the first embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

The backplane system provided in this embodiment includes an upper back board and a lower back board that cooperate with each other; wherein the lower end of the upper back board is connected to the upper end of the lower back board. Specifically, the lower end of the upper back plate is provided with a first engaging mechanism, and the upper end of the lower back plate is provided with a second engaging mechanism, and the upper back plate and the lower back plate are engaged by the first engaging mechanism and the second engaging mechanism. After the connection is connected by the connection structure, the assembly error of the upper back plate and the lower back plate in the horizontal and vertical directions during assembly can be reduced as much as possible.

The embodiment further provides a corresponding position on the first engaging mechanism and the second engaging mechanism (the first positioning hole and the second positioning hole are arranged to have an overlap in the vertical space for the positioning member to pass through after assembly). a first positioning hole and a second positioning hole of the area, and a third positioning hole corresponding to the first positioning hole and the second positioning hole is disposed on the frame of the centralized switching device; the positioning member is on the upper back plate and the lower positioning hole After the backplane is snap-fitted by the first engaging mechanism and the second engaging mechanism, the backplane and the lower backplane are fixed to the rack through the first positioning hole, the second positioning hole, and the third positioning hole on the frame. on. The positioning member and the third positioning hole may be configured to pass through the third positioning hole. For example, one end of the positioning member passing through the third positioning hole is provided with an external thread, and the third positioning hole is transmitted to cooperate with the corresponding nut; The positioning member and the third positioning hole may also be configured to stay in the third positioning hole. For example, the sidewall of the third positioning hole is provided with an internal thread, and the positioning member passes through one end of the first positioning hole and the second positioning hole. The external thread is provided, and the end penetrates the first positioning hole and the second positioning hole, and then enters the third positioning hole and cooperates with the internal thread in the third positioning hole.

It can be seen that the upper back board and the lower back board in the embodiment can be connected to each other through the locating mechanism disposed in the mutual arrangement and then fixed on the frame through the same positioning member, thereby reducing the installation precision of the back board and the reliability of the product, and reducing The damage rate of the exchange/cross-board connector can greatly improve the product qualification rate, increase production efficiency and reduce production cost in production.

The specific structures adopted by the first occlusion mechanism and the second occlusion mechanism in this embodiment may be specifically selected according to actual application scenarios. The following description will be made in conjunction with several exemplary ways shown in the drawings.

Referring to FIG. 5, the first engaging mechanism disposed at the lower end of the upper back plate 1 includes a first limiting groove 11 having a groove depth smaller than the thickness of the upper back plate 1. (That is, the groove does not penetrate the upper back plate in the thickness direction of the upper back plate 11). The second engaging mechanism disposed at the upper end of the lower back plate 2 includes a first boss 21 having a position and a size corresponding to the first limiting groove 11; at the time of assembly, the first boss 21 of the lower back plate 2 is fastened to A snap connection is achieved in the first limiting slot 11 of the upper back panel 1 .

The first limiting recess 11 of the upper back panel 1 and the first protruding bracket 21 of the lower back panel 2 are disposed on the same surface. For example, the first limiting recess 11 is disposed on the front surface of the upper back panel 1 . A corresponding first boss 21 is also provided on the front side of the lower back panel 2.

In this embodiment, the thickness of the first boss 21 of the lower back plate 2 is less than or equal to the depth of the first limiting groove 11 of the upper back plate 1; After the first boss 21 of the lower back panel 2 is fastened into the first limiting slot 11 of the upper back panel 1, the first boss 21 is flush with the upper and lower backplanes. Preferably, in the embodiment, the depth of the first limiting groove 11 of the upper back plate 1 is taken as one-half of the thickness of the upper back plate 1; the thickness of the first protruding portion 21 of the lower back plate 2 is equal to the upper back plate. The depth of the first limit groove 11 of 1.

In this embodiment, in order to ensure the acceptability of the new and old products and the versatility of the product, the size of the upper back plate 1 in FIG. 5 can still adopt the size of the existing upper back plate; the lower back plate 2 is on the existing lower back. On the basis of the plate, a first boss 21 of a certain length is extended at the upper end, so that the upper back plate 1 and the lower back plate 2 are buckled and lapped to be the same size as the existing upper and lower back plates.

In addition, as shown in FIG. 5, a first positioning hole 111 is disposed at the bottom of the first limiting groove 11, the first positioning hole 111 penetrates the back plate 1; and the second position of the first protrusion 21 is provided with a second position. The positioning hole 211 and the second positioning hole 211 penetrate the first boss 21 . The first positioning hole 111 and the second positioning hole 211 may completely coincide (or at least partially overlap) after assembly, so that the positioning member (specifically, the positioning pin) passes through the upper and lower back plates to be fixed on the frame.

Referring to FIG. 6 , the structure shown in FIG. 5 and the structure shown in FIG. 5 are reversely provided with a second limiting groove 22 on the lower back plate 2 , and the groove depth of the second limiting groove 22 is smaller than that. a thickness of the back plate 2; a second boss 12 having a position and a size corresponding to the second limiting groove 22 is disposed at a lower end of the upper back plate 1, and the second boss 12 of the upper back plate 1 is engaged at the time of assembly A snap connection is achieved in the second limiting slot 22 of the lower back panel 2.

The second boss 12 of the upper back panel 1 and the second limiting recess 22 of the lower back panel 2 are disposed on the same surface. For example, the second boss 12 is disposed on the front surface of the upper back panel 1 , corresponding to The second limiting groove 22 is also disposed on the front surface of the lower back plate 2.

In this embodiment, the thickness of the second boss 12 of the upper back panel 1 is less than or equal to the depth of the second limiting recess 22 of the lower back panel 2 to ensure that the second boss 12 of the upper back panel 1 is fastened to the lower back. The second boss 12 of the second limiting slot 22 of the board 2 is flush with the upper and lower backplanes. Preferably, the depth of the second limiting groove 22 of the lower back plate 2 in the embodiment is taken as one-half of the thickness of the lower back plate 2; the thickness of the second boss 12 of the upper back plate 2 is equal to the lower back plate. The depth of the second limit groove 22 of 2.

In this embodiment, in order to ensure the acceptability of the new and old products and the versatility of the product, the size of the lower back plate 2 in FIG. 6 can still adopt the size of the existing upper back plate; the upper back plate 1 is on the existing upper back. On the basis of the plate, a second boss 12 of a certain length is extended at the lower end, so that the upper back plate 1 and the lower back plate 2 are folded and lapped to be the same size as the existing upper and lower back plates.

In addition, as shown in FIG. 6 , a second positioning hole 221 is disposed at the bottom of the second limiting groove 22 , and the second positioning hole 221 extends through the back plate 2 ; The positioning hole 121 and the second positioning hole 121 penetrate the second boss 12 . The first positioning hole 121 and the second positioning hole 221 may completely coincide (or at least partially overlap) after assembly, so that the positioning member (specifically, the positioning pin) passes through the upper and lower back plates to be fixed on the frame.

Referring to FIG. 7 , the figure shows an example of combining the two connection structures of FIG. 5 and FIG. 6 . The first limiting groove 11 and the second protrusion 12 are disposed at the lower end of the upper back plate 1 ; The upper end of the plate 2 is correspondingly provided with a first boss 21 and a second limiting groove 22; the upper back plate 1 and the lower back plate 2 are engaged with the first boss 21 by the first limiting groove 11 and the second convex portion The table 12 and the second limiting groove 22 are engaged with each other to achieve connection.

It should be understood that, in this embodiment, the number of the first limiting groove 11, the first boss 21, and the number of the second limiting groove 22 and the second boss 12 can be selected according to specific applications. . The more the number is set, the better the reliability of the connection. In this embodiment, when the first limiting groove 11 and the second boss 12 are simultaneously disposed on the upper back plate 1, the first limiting groove 11 and The second boss 12 is disposed on the same surface; the first boss 21 and the second limiting groove 22 on the corresponding lower back plate 2 are also disposed on the corresponding same surface. When the multi-engagement mechanism is provided, the positioning holes may be provided on each pair of the engaging mechanisms, or the positioning holes may be provided on the selected at least one pair of engaging mechanisms.

In addition to the connecting mechanism shown in FIG. 5-7, the first engaging mechanism of the embodiment may include only the first limiting groove, and the width of the first limiting groove is equal to the width of the upper back plate, that is, the first limiting concave. The width of the groove extends transversely through the lower end of the upper back plate; the width of the first boss on the lower back plate is equal to the width of the lower back plate; at this time, the first limit groove and the first boss are engaged and overlapped, up and down A side view of the back plate is shown in FIG. 8. The first limiting groove 11 at the lower end of the upper back plate 1 receives the first protrusions 21 at the upper end of the lower back plate 2 to achieve mutual engagement and overlapping.

Correspondingly, the second engaging mechanism may only include a second limiting groove, the second limiting groove width is equal to the width of the lower back plate; the first engaging mechanism correspondingly only includes the second protruding portion, and the width of the second protruding portion is equal to The width of the upper back panel. After assembly, the second limiting groove on the lower back plate receives the second protrusion of the lower end of the upper back plate to achieve mutual engagement and overlapping.

It should be understood that the protrusions and recesses on the upper back plate and the lower back plate in this embodiment can be formed by first obtaining a complete PCB board and then milling the corresponding length and thickness of the PCB board in the corresponding area. It should be understood that the upper back board and the lower back board in this embodiment may be a single-sided PCB board or a double-sided PCB board.

Embodiment 2:

In order to better understand the embodiment of the present invention, the connection mechanism shown in FIG. 8 is taken as an example, combined with a specific size of the upper and lower back plates, and the limit plate and the corresponding groove are formed by milling the PCB board of the corresponding length and thickness. The method of the protrusion is taken as an example to further explain the embodiment of the present invention.

Specifically, in the embodiment, the thickness of the upper and lower back plates are both 6.5 mm, and the widths of the upper and lower back plates are the same; in order to ensure the versatility of the size, the present embodiment is additionally based on the existing upper and lower back plates. The extension extends 7 mm, and the 7 mm that grows are respectively at the lower end of the upper back panel and the upper end of the lower back panel (ie, the junction of the upper and lower back panels). Then, a PCB having a length of 14 mm and a thickness of half of the PCB (ie, 3.25 mm) is milled on the front surface of the lower back plate to form a first limit groove having a groove depth of 3.25 mm at the lower end of the upper back plate, and The bottom of a limiting slot forms at least one first positioning hole (or first mounting hole) penetrating the upper backing plate. Cutting a PCB having a length of 14 mm and a thickness of half of the PCB (ie, 3.25 mm) on the back surface of the lower back plate surface to form a first protrusion having a thickness of 3.25 mm on the front surface of the upper end of the lower back plate; and forming on the first protrusion a second positioning hole (or a second mounting hole) corresponding to the position of the first mounting hole on the upper back plate and extending through the first protrusion. During assembly, the first protrusion on the lower back plate overlaps the first limiting groove of the upper back plate to realize the snap connection of the upper back plate and the lower back plate, and then passes through the upper and lower back through the same positioning pin. The positioning holes on the board are fixed to the rack. Then insert the swap/cross board into the upper and lower backplanes.

At present, the positional accuracy of the PCB positioning hole can reach 0.0508mm, and the large-sized back plate can reach 0.254mm, which is much higher than the processing precision of the frame. Thus, through the solution of the embodiment of the present invention, the mounting alignment of the upper and lower back plates can effectively improve the accuracy in both the horizontal direction and the vertical direction, thereby avoiding damage to the cross board connector and the back board when the switching/cross board is inserted into the back board. Connector socket. Increased production efficiency and product reliability, reducing production costs and maintenance costs.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

As described above, according to the above embodiments and the preferred embodiment, the upper back plate and the lower back plate can be connected to each other through the locating mechanism disposed at the same time and then fixed to the frame by the same positioning member, thereby reducing assembly errors and avoiding exchange. /The connector on the cross-board connector and the backplane cannot be precisely aligned, causing damage to the connector pins and sockets, which may result in damage to the function of the device, which can greatly improve the product qualification rate and improve the production efficiency in production. reduce manufacturing cost.

Claims

A backplane system includes an upper backboard and a lower backboard, wherein a lower end of the upper backboard is provided with a first engaging mechanism, and an upper end of the lower backboard is provided with a second engaging mechanism, the upper backboard and the The back plate is coupled by the first engaging mechanism and the second engaging mechanism.
The backplane system according to claim 1, wherein the first engaging mechanism comprises a first limiting groove, the groove depth of the first limiting groove is smaller than a thickness of the upper back plate; The second engaging mechanism includes a first boss that is disposed at a position and a size corresponding to the first limiting groove; the first boss is fastened into the first limiting slot to implement the first engaging mechanism and the a bite connection of the second bite mechanism;

and / or,

The second engaging mechanism includes a second limiting groove, the groove depth of the second limiting groove is smaller than the thickness of the lower back plate; the first engaging mechanism includes a position and a size and the second limit a second boss corresponding to the groove, the second boss being fastened into the second limiting groove to realize a snap connection of the first engaging mechanism and the second engaging mechanism.
The backplane system according to claim 2, wherein when the first engaging mechanism includes a first limiting groove, the first limiting groove is disposed at a front surface of the upper back plate; The first boss included in the occlusion mechanism is correspondingly disposed on a front surface of the lower back plate;

When the second engaging mechanism includes the second limiting groove, the second limiting groove is disposed on a front surface of the lower back plate; the second protruding portion of the first engaging mechanism is correspondingly disposed on the The front of the upper back panel.
The backplane system according to claim 2 or 3, wherein when the first engaging mechanism includes the first limiting groove, the thickness of the first boss included in the second engaging mechanism is less than or equal to the first The depth of the limit groove;

When the second engaging mechanism includes the second limiting groove, the thickness of the second boss included in the first engaging mechanism is less than or equal to the depth of the second limiting groove.
The backplane system according to claim 2 or 3, wherein when the first engaging mechanism includes only the first limiting groove, the first limiting groove width is equal to the upper backing plate width; The second engaging mechanism correspondingly includes only the first boss, and the width of the first boss is equal to the width of the lower back plate;

When the second engaging mechanism includes only the second limiting groove, the second limiting groove width is equal to the lower back plate width; the first engaging mechanism correspondingly includes only the second protruding portion, The width of the second boss is equal to the width of the upper back plate.
The backplane system according to claim 4, wherein when the first engaging mechanism comprises the first limiting groove, the groove depth of the first limiting groove is two-half of the thickness of the upper back plate One;

When the second engaging mechanism includes the second limiting groove, the groove depth of the second limiting groove is one-half of the thickness of the lower back plate.
A centralized switching device, comprising a rack, a positioning member, and the backplane system according to any one of claims 1-6, The first engaging mechanism and the second engaging mechanism are respectively provided with a first positioning hole and a second positioning hole corresponding to the position, and the frame is provided with a position and the first positioning hole and the second positioning hole Corresponding third positioning holes; the positioning member passes through the first positioning hole after the upper back plate and the lower back plate are engaged by the first engaging mechanism and the second engaging mechanism And a second positioning hole and cooperates with a third positioning hole on the frame to fix the upper back plate and the lower back plate on the frame.
A backplane connection method includes:

a first engaging mechanism is disposed at a lower end of the upper back plate, and a second engaging mechanism is disposed at an upper end of the lower back plate;

The upper back plate and the lower back plate are snap-fit connected by the first engaging mechanism and the second engaging mechanism.
The backplane connection method according to claim 8, wherein the first engaging mechanism comprises a first limiting groove, the groove depth of the first limiting groove is smaller than a thickness of the upper back plate; The second engaging mechanism includes a first boss that is disposed at a position and a size corresponding to the first limiting groove; the first boss is fastened into the first limiting slot to implement the first engaging mechanism and a snap connection of the second engaging mechanism;

and / or,

The second engaging mechanism includes a second limiting groove, the groove depth of the second limiting groove is smaller than the thickness of the lower back plate; the first engaging mechanism includes a position and a size and the second limit a second boss corresponding to the groove, the second boss being fastened into the second limiting groove to realize a snap connection of the first engaging mechanism and the second engaging mechanism.
A method for fixing a backboard, comprising:

a first engaging mechanism is disposed at a lower end of the upper back plate, a second engaging mechanism is disposed at an upper end of the lower back plate, and a first positioning hole corresponding to the position is disposed on the first engaging mechanism and the second engaging mechanism, respectively a second positioning hole; a third positioning hole corresponding to the first positioning hole and the second positioning hole on the frame; and a positioning member;

The positioning member passes through the first positioning hole, the second positioning hole and the ground after the upper back plate and the lower back plate are engaged by the first engaging mechanism and the second engaging mechanism. A third positioning hole on the frame cooperates to fix the upper back plate and the lower back plate to the frame.