TWI787801B - Multilayer connection structure - Google Patents

Abstract

A multilayer connection structure. The multilayer connection structure includes a first shell, a second shell, a third shell, a first connecting piece and a second connecting piece. The first shell includes a positioning part, a limit part, and a fixing part. The second housing includes a positioning groove, a limit groove, a first through hole, and a first installation hole. The limit part is used for embedding in the limit groove and the positioning part is used for embedding the positioning groove. The third housing includes a second mounting hole corresponding to the first through hole and a fixing hole corresponding to the first mounting hole. The fixing part is used to pass through the first through hole and extend into the second mounting hole. The first connection is used to extend the fixing hole through the first mounting hole to connect the second housing with the third housing. The second connection is used to extend through the second mounting hole and connect with the fixing part to connect the three shells. The multilayer connection structure provided by the invention has the advantages of simple structure, convenient disassembly, and quick disassembly.

Description

Multi-layer connection structure

The invention relates to a multilayer connection structure.

There are many ways to connect multiple components, but the traditional connection methods mostly use a large number of screw connections, or hot-melt connections, or ultrasonic welding, etc. The connection operation is inconvenient, and the exposed screws will also affect the appearance of the product.

Especially for the connection and fixation of multi-layer components whose structure is complex or needs to be miniaturized, if the traditional connection method is used, it will undoubtedly increase the volume of the structure and the difficulty of assembly.

In view of this, it is necessary to provide a multi-layer connection structure, which can realize fast assembly and connection of multi-layer connection parts, avoiding the use of connection methods such as welding or too many screws.

The invention provides a multilayer connection structure, which includes a first shell, a second shell, a third shell, a first connecting piece and a second connecting piece. The first housing includes a first surface and a second surface opposite to the first surface, and a positioning portion, a limiting portion and a fixing portion protrude from the first surface away from the second surface. The second housing includes a third surface and a fourth surface opposite to the third surface. The second housing is provided with a positioning groove, a limiting groove, a first through hole and a first mounting hole. The first through hole Both the hole and the first installation hole are set through the third surface and the fourth surface, the limiting part is used to extend into the limiting groove to limit the second housing, and the positioning part is used to extend into the positioning groove so that the second shell is fixed on the first shell. The third housing includes a second mounting hole corresponding to the first through hole and a positioning hole corresponding to the first mounting hole, the fixing part is used to pass through the first through hole and extend into the second mounting hole Inside. The first connecting piece is used to extend into the positioning hole through the first mounting hole to connect the second shell with the third shell. The second connecting piece is used to protrude through the second mounting hole and connect with the fixing part, so as to connect the second shell and the third shell with the first shell.

In the embodiment of the present application, the positioning portion includes a first positioning member, and the first positioning member includes a first connecting arm disposed on the first surface and a first positioning arm disposed on an end of the first connecting arm away from the first surface. Piece. The positioning slot includes a first positioning slot, the first positioning slot includes a first opening and the The first opening communicates with the first accommodating cavity, the first connecting arm is used for accommodating in the first opening, and the first positioning block is used for accommodating in the first accommodating cavity and engaging with the first positioning groove.

In the embodiment of the present application, the dimension of the first opening along the direction parallel to the third surface is greater than the dimension of the first positioning block along the direction parallel to the third surface.

In the embodiment of the present application, the positioning part further includes a second positioning member, and the second positioning member includes a second connecting arm disposed on the first surface, a second connecting arm disposed on an end of the second connecting arm away from the first surface. A positioning block and a hook disposed at an end of the second positioning block away from the second connecting arm, the hook extending toward the first surface. The positioning groove also includes a second positioning groove, the second positioning groove includes a second opening, a second accommodation cavity communicated with the second opening, and a protrusion disposed on a side of the second accommodation cavity close to the third surface, The protrusion extends toward the fourth surface, the second connecting arm is used to be accommodated in the second opening, the second positioning block is used to be accommodated in the second receiving cavity, and the hook is used to cooperate with the protrusion Snap.

In the embodiment of the present application, the dimension of the second opening along the direction parallel to the third surface is greater than the dimension of the second positioning block along the direction parallel to the third surface.

In the embodiment of the present application, the hook is one piece.

In the embodiment of the present application, the limiting portion includes two first limiting strips disposed opposite to each other and a second limiting strip connecting the two first limiting strips. The limiting groove is surrounded by two first side walls arranged oppositely and a second side wall connecting the two first side walls, the limiting part is used to extend into the limiting groove, and the first limiting bar is against The first side wall and the second limiting strip are against the second side wall.

In the embodiment of the present application, the two first side walls protrude toward one side of the limiting part to form a plurality of ribs, and the ribs are used to resist the two first limiting bars.

In the embodiment of the present application, the first side wall includes an inclined plane connected to the third surface and a vertical plane connected to the inclined plane, the vertical plane is perpendicular to the third surface, and the inclined plane forms an obtuse angle with the third surface.

In the embodiment of the present application, the limiting portion is an elastic member, and the elastic member is interference-fitted with the limiting groove.

Compared with the conventional technology, the multi-layer connection structure provided by the present invention is the connection structure of the three-layer shell, which adopts the snap-fit connection method combined with a small number of screw connections, which can realize the rapid assembly of the multi-layer shell, the overall structure is simple, and it is convenient for quick disassembly Traditional methods such as assembly and welding are not required, which greatly reduces the amount of screws used, and the product has fewer exposed screws, which will not affect the appearance of the product. It has a wide range of applications and can be used for connection and fixation between multi-layer shells in various scenarios.

1000,200: multi-layer connection structure

1: The first shell

11: First table

12: Second surface

13: Positioning Department

131: The first positioning part

1311: the first connecting arm

1312: the first positioning block

132: The second positioning part

1321: Second connecting arm

1322: The second positioning block

1323: hook

14,16: limit part

141: The first limit bar

142: The second limit bar

15: fixed part

151: Cylinder

152: hole position

2: Second shell

21: Third Surface

22: The fourth surface

23: positioning slot

231: the first tank

2311: first opening

2312: The first storage chamber

232: Second tank body

2321: second opening

2322: Second storage chamber

2323: Bump

24: limit slot

241: first side wall

2411: Bevel

2412: vertical surface

242: second side wall

243: Ribs

25: The first through hole

26: The first mounting hole

261: first hole wall

262: second hole wall

263: The first step

264: Second through hole

265: The third through hole

3: The third shell

31: fifth surface

32: Sixth Surface

33: positioning hole

34: Second mounting hole

341: third hole wall

342: Fourth Hole Wall

343: The second step

344: The fourth through hole

345: Fifth through hole

4: The first connector

41: The first connecting rod

42: The first connector

5: The second connector

51: Second connecting rod

52: Second connector

Fig. 1 is a schematic structural diagram of a multi-layer connection structure provided by an embodiment of the present invention.

FIG. 2 is a cross-sectional view along II-II of the multilayer connection structure provided in FIG. 1 .

Fig. 3 is a schematic structural diagram of a first housing provided by an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a connected first casing and a second casing provided by an embodiment of the present invention.

Fig. 5 is a sectional view along V-V after connecting the first housing and the second housing provided in Fig. 4 .

FIG. 6 is a sectional view along VI-VI after the connection of the first housing and the second housing provided in FIG. 4 .

Fig. 7 is a schematic structural diagram of a limiting part embedded in a limiting groove provided by an embodiment of the present invention.

FIG. 8 is a cross-sectional view along VIII-VIII of the multilayer connection structure provided in FIG. 1 .

Fig. 9 is a schematic structural diagram of a first installation hole provided by an embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a second mounting hole provided by an embodiment of the present invention.

Fig. 11 is a schematic structural view of a multi-layer connection structure provided by another embodiment of the present invention.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

The system implementation described below is only illustrative, and the The division is only a logical function division, and there may be another division method in actual implementation. In addition, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system requirements may also be implemented by the same unit or device through software or hardware. The words first, second, etc. are used to denote names and do not imply any particular order.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 to FIG. 4 and FIG. 8 , which is a multi-layer connection structure 1000 provided by an embodiment of the present invention. The multi-layer connection structure 1000 includes a first shell 1, a second shell 2, a third shell 3, The first connecting piece 4 and the second connecting piece 5 . The first housing 1 includes a first surface 11 and a second surface 12 opposite to the first surface 11, the first surface 11 is provided with a positioning portion 13 and a limiting portion 14 protruding away from the second surface 12 And the fixing part 15. The second housing 2 includes a third surface 21 and a fourth surface 22 opposite to the third surface 21, the fourth surface 22 is recessed toward the third surface 21 to form a positioning groove 23 and a limiting groove 24, which pass through the The third surface 21 and the fourth surface 22 are formed with a first through hole 25 and a first mounting hole 26 . The third housing 3 includes a fifth surface 31 and a sixth surface 32 opposite to the fifth surface 31, the fifth surface 31 is recessed toward the sixth surface 32 to form a positioning hole 33, passing through the fifth surface 31 and The sixth surface 32 is formed with a second mounting hole 34 . The limiting part 14 is used to insert into the limiting groove 24 to limit the second housing 2; the positioning part 13 is used to insert into the positioning groove 23 so that the second housing 2 is fixed on the first On a housing 1; the first mounting hole 26 corresponds to the positioning hole 33, and the first connecting member 4 is used to pass through the first mounting hole 26 and extend into the positioning hole 33 so that the second housing 2 Connected with the third housing 3; the fixing part 15 is used to pass through the first through hole 25 and extend into the second mounting hole 34, and the second connecting piece 5 is used to communicate with the second mounting hole 34 through the second mounting hole 34. The fixing portion 15 is connected to connect the first housing 1 , the second housing 2 and the third housing 3 .

Please refer to FIG. 3 , the first housing 1 is generally a sheet-like structure, and the positioning portion 13 , the limiting portion 14 and the fixing portion 15 are integrally formed with the first surface 11 .

In this embodiment, the first casing 1 , the second casing 2 and the third casing 3 can all be plastic casings.

Please refer to FIG. 2 to FIG. 4 , the positioning portion 13 includes a first positioning member 131 and a second positioning member 132 . The positioning groove 23 includes a first groove body 231 and a second groove body 232, the first positioning piece 131 is used to be embedded in the first groove body 231, and the second positioning piece 132 is used to be embedded in the second groove body 232, so that the second shell 2 is preliminarily fixed on the first shell 1.

Referring to FIG. 4 and FIG. 5 , in some embodiments, the first positioning member 131 includes a first connecting arm 1311 disposed on the first surface 11 and an end of the first connecting arm 1311 away from the first surface 11 . The first positioning block 1312 of . The first groove body 231 includes a first opening 2311 and a first accommodation chamber 2312 for accommodating the first positioning block 1312, the first opening 2311 communicates with the first accommodation chamber 2312, and the first accommodation chamber 2312 is parallel to the The width of the third surface 21 is greater than the width of the first opening 2311 , and the first opening 2311 and the first receiving cavity 2312 form an L-shaped structure. The first positioning block 1312 is used to snap into the first receiving chamber 2312 from the first opening 2311, the first connecting arm 1311 is located in the first opening 2311, so that the first positioning member 131 and the first The groove body 231 is engaged.

In this embodiment, the size of the first opening 2311 along the direction parallel to the third surface 21 is larger than the size of the first positioning block 1312, so that the first positioning block 1312 can extend into the first opening 2311 and snap into the Inside the first receiving cavity 2312 . At the same time, the length of the first connecting arm 1311 protruding from the first surface 11 is equal to the depth of the first opening 2311. Three surfaces 21 are in contact.

In this embodiment, the first groove body 231 is disposed through the third surface 21 and the fourth surface 22 .

Referring to FIG. 4 and FIG. 6 , the second positioning member 132 includes a second connecting arm 1321 disposed on the first surface 11 , and a second positioning block 1322 disposed on the end of the second connecting arm 1321 away from the first surface 11 . And a hook 1323 disposed on an end of the second positioning block 1322 away from the second connecting arm 1321 , the hook 1323 extends toward the first surface 11 . The second tank body 232 includes a second opening 2321 and a second accommodating chamber 2322 communicating with the second opening 2321. The raised protrusion 2323, the width of the second receiving cavity 2322 along the direction parallel to the third surface 21 is larger than the width of the second opening 2321, and the second opening 2321 and the second receiving cavity 2322 form an L-shaped structure. The second positioning block 1322 is used to be locked into the second receiving cavity 2322 through the second opening 2321, and the protrusion 2323 is used to lock the hook 1323 to realize the second positioning member 132 and the second slot body 232 snap-fit.

In this embodiment, the size of the second opening 2321 along the plane where the third surface 21 is located is larger than the size of the second positioning block 1322, so that the second positioning block 1322 can extend into the second opening 2321 and snap into the second positioning block 1322. Inside the second accommodating chamber 2322 . At the same time, the length of the second connecting arm 1321 protruding from the first surface 11 is equal to the depth of the second opening 2321. Three surfaces 21 are in contact.

In this embodiment, the second groove body 232 is disposed through the third surface 21 and the fourth surface 22 .

In this embodiment, the hook 1323 is an elastic piece. When the second positioning member 132 is inserted into the second groove body 232, the protrusion 2323 presses the elastic piece to deform the elastic piece so that the second positioning The block 1322 is embedded in the second receiving cavity 2322, and when the elastic piece enters the second receiving cavity 2322, the elastic piece recovers and deforms to engage with the protrusion 2323, so as to realize the positioning of the second positioning member 132 in the second groove body 232. position. By setting the hook 1323 as an elastic piece, it is easy to operate during positioning and the connection is stable.

Referring to FIG. 3 and FIG. 7 , the limiting portion 14 includes two first limiting bars 141 opposite to each other and a second limiting bar 142 connecting the two first limiting bars 141 . The limiting groove 24 is surrounded by two first side walls 241 oppositely arranged and a second side wall 242 connecting the two first side walls 241, the limiting part 14 is embedded in the limiting groove 24, and the first limiting bar 141 against the first sidewall 241 , and the second limiting strip 142 against the second sidewall 242 .

In this embodiment, the two first side walls 241 protrude toward the side of the limiting portion 14 to form a plurality of ribs 243, and the ribs 243 are used to strengthen the extrusion of the two first limiting bars 141, so that the The limiting portion 14 is fastened in the limiting groove 24 .

In this embodiment, referring to FIG. 2 , the rib 243 is arc-shaped along a section parallel to the third surface 21 , and the arc-shaped rib 243 makes it easier for the limiting portion 14 to fit into the limiting groove 24 .

In this embodiment, the first side wall 241 includes a slope 2411 and a vertical surface 2412, the vertical surface 2412 is set perpendicular to the third surface 21, the slope 2411 is set at an obtuse angle with the third surface 21, so that the limiting groove 24 The size of the opening is larger than the size of the limiting portion 14 , so that the limiting portion 14 is inserted into the limiting groove 24 .

Please refer to FIG. 9 , referring to FIG. 2 and FIG. 8 , the first mounting hole 26 on the second housing 2 includes a first hole wall 261 , a second hole wall 262 and second hole wall 262 between the first step portion 263, the first hole wall 261 surrounds the second through hole 264, the second hole wall 262 surrounds the third through hole 265, the second through hole 264 and the third The through holes 265 are coaxial, the diameter of the second through hole 264 is larger than the diameter of the third through hole 265 , and the diameter of the positioning hole 33 on the third housing 3 is smaller than or equal to the diameter of the third through hole 265 . The first connecting member 4 includes a first connecting rod 41 and a first connecting head 42, the size of the first connecting head 42 along the direction parallel to the third surface 21 is larger than the size of the first connecting rod 41, the first connecting rod 41 extends into the positioning hole 33 through the second through hole 264 and the third through hole 265, and the first connecting head 42 abuts against the surface of the first stepped portion 263 close to the second through hole 264 to realize the second through hole 264. The connection between the second housing 2 and the third housing 3 .

In this embodiment, the hole wall of the positioning hole 33 is provided with an internal thread, the first connecting piece 4 is a screw with a cap, and the surface of the first connecting rod 41 is provided with an external thread that engages with the internal thread. The first connecting member 4 is screwed into the positioning hole 33 to realize the connection between the second shell 2 and the third shell 3 .

In this embodiment, there are two first mounting holes 26 , and there are also two corresponding positioning holes 33 and first connecting parts 4 . The second casing 2 and the third casing 3 can be initially connected and fixed by the two first connecting pieces 4 .

Please refer to FIG. 10 , referring to FIG. 2 and FIG. 8 , the second mounting hole 34 on the third housing 3 includes a third hole wall 341 , a fourth hole wall 342 The second step portion 343 between the fourth hole walls 342, the third hole wall 341 surrounds the fourth through hole 344, the fourth hole wall 342 surrounds the fifth through hole 345, the fourth through hole 344 Coaxial with and communicating with the fifth through hole 345 , the diameter of the fourth through hole 344 is larger than the diameter of the fifth through hole 345 . The diameter of the first through hole 25 on the second housing 2 is smaller than or equal to the diameter of the fifth through hole 345 . The fixing portion 15 on the first housing 1 is used to extend through the first through hole 25 to the opening of the fifth through hole 345 , the fixing portion 15 includes a cylinder 151 and is formed by surrounding the cylinder 151 The hole 152 extends along a direction perpendicular to the first surface 11 , and the opening direction faces the second casing 2 . The second connecting member 5 includes a second connecting rod 51 and a second connecting head 52, the size of the second connecting head 52 along the direction parallel to the third surface 21 is larger than the size of the second connecting rod 51, the second connecting rod 51 extends into the hole 152 of the fixing part 15 through the fourth through hole 344 and the fifth through hole 345, and the second connecting head 52 abuts against the surface of the second stepped part 343 close to the fourth through hole 344 , so as to realize the connection of the first shell 1 , the second shell 2 and the third shell 3 .

In this embodiment, the inner wall of the cylinder 151 is provided with an internal thread, and the surface of the second connecting rod 51 is provided with an external thread engaged with the internal thread. By screwing the second connecting piece 5 into the solid In the fixed part 15 , the connection of the first shell 1 , the second shell 2 and the third shell 3 is realized.

In this embodiment, there are two second mounting holes 34 , and there are two corresponding first through holes 25 , fixing portions 15 and second connecting pieces 5 . The first shell 1, the second shell 2 and the third shell 3 are further connected and fixed by two second connectors 5 to realize the connection of multiple shells, avoiding the use of too many screws or welding for connection, and at the same time it can Avoid too many exposed screws affecting the appearance of the product.

Referring to FIG. 1 to FIG. 8 , the cooperative assembly method of the multi-layer connection structure 1000 provided by the present invention is as follows: firstly, the second housing 2 and the third housing 3 are connected and fixed by the first connector 4 .

Then, snap the first positioning piece 131 , the second positioning piece 132 and the limiting part 14 on the first housing 1 into the corresponding first groove body 231 , second groove body 232 and limiting groove of the second housing 2 24, while the fixing part 15 on the first housing 1 extends into the second installation hole 34 through the first through hole 25 of the second housing 2 to achieve preliminary fixing.

Next, the second connecting member 5 is screwed into the hole 152 of the fixing portion 15 through the second mounting hole 34 , finally realizing the connection and fixing of the first shell 1 , the second shell 2 and the third shell 3 .

This method has a multi-layer connection structure of 1000, which is simple and quick to connect and fix, and does not require traditional methods such as welding and screw connection, greatly reduces the amount of screws used, and does not affect the appearance of the product.

Please refer to Fig. 11, the second embodiment of the present invention also provides a multi-layer connection structure 200, the main difference between the multi-layer connection structure 200 and the multi-layer connection structure 1000 of the first embodiment is that the limiting part 16 is an elastic member, and the elastic The width of the component is slightly larger than the width of the limiting groove 24, and the limiting portion 16 and the limiting groove 24 are fixed to each other by interference fit, so as to realize the limiting effect on the second housing 2. It should be noted that within the scope of the spirit or basic features of the present invention, the specific solutions applicable to the first embodiment can also be correspondingly applicable to the second embodiment. For the sake of saving space and avoiding repetition, in I won't repeat it here. In this embodiment, the limiting portion 16 and the limiting groove 24 are fixed to each other by interference fit, so as to realize the limiting effect on the second shell 2, which is convenient for assembly, and at the same time, the second shell can also be strengthened. The stability of body 2.

Compared with the conventional technology, the multi-layer connection structure provided by the present invention is the connection structure of the three-layer shell, which adopts the snap-fit connection method combined with a small number of screw connections, which can realize the rapid assembly of the multi-layer shell, The overall structure is simple, easy to disassemble and assemble quickly, no traditional methods such as welding are required, the amount of screws is greatly reduced, and the exposed screws of the product are few, which will not affect the appearance of the product. It has a wide range of applications and can be used between multi-layer shells in various scenarios. The connection is fixed.

1000: multi-layer connection structure

1: The first shell

2: Second shell

3: The third shell

Claims (10)

A multi-layer connection structure, including: a first shell, including a first surface and a second surface opposite to the first surface, the first surface is away from the second surface and is provided with a positioning part, a limiting position portion and fixing portion; the second housing includes a third surface and a fourth surface opposite to the third surface, and the second housing is provided with a positioning groove, a limiting groove, a first through hole and a first through hole. A mounting hole, the first through hole and the first mounting hole both pass through the third surface and the fourth surface, and the limiting part is used to extend into the limiting groove to align the The second housing is limited, and the positioning part is used to extend into the positioning groove so that the second housing is fixed on the first housing; the third housing includes a The second mounting hole corresponding to the hole and the positioning hole corresponding to the first mounting hole, the fixing part is used to pass through the first through hole and extend into the second mounting hole; the first connecting piece, used to extend into the positioning hole through the first mounting hole to connect the second housing with the third housing; and a second connecting piece, used to extend into the positioning hole through the second mounting hole And be connected with the fixing part, so that the second shell and the third shell are connected with the first shell. The multi-layer connection structure according to claim 1, wherein the positioning part includes a first positioning member, and the first positioning member includes a first connecting arm arranged on the first surface and a first connecting arm arranged on the first connecting arm. The first positioning block at the end of the arm away from the first surface; the positioning groove includes a first positioning groove, and the first positioning groove includes a first opening and a first receiving cavity communicating with the first opening, the The first connecting arm is configured to be accommodated in the first opening, and the first positioning block is configured to be accommodated in the first accommodation cavity and engaged with the first positioning groove. The multi-layer connection structure according to claim 2, wherein the dimension of the first opening along the direction parallel to the third surface is larger than the dimension of the first positioning block along the direction parallel to the third surface. The multi-layer connection structure according to claim 2, wherein the positioning part further includes a second positioning part, and the second positioning part includes a second connecting arm disposed on the first surface, a second connecting arm disposed on the second The second positioning block at the end of the connecting arm away from the first surface and the hook provided at the end of the second positioning block away from the second connecting arm, the hook extends toward the first surface; the positioning The groove also includes a second positioning groove, and the second positioning groove includes a second opening, a second accommodation cavity communicated with the second opening, and a protrusion disposed on a side of the second accommodation cavity close to the third surface. block, the protruding block extends toward the fourth surface, the second connecting arm is used to be accommodated in the second opening, the second positioning block is used to be accommodated in the second accommodation cavity, and The hook is used to engage with the bump. The multi-layer connection structure according to claim 4, wherein the dimension of the second opening along the direction parallel to the third surface is larger than the dimension of the second positioning block along the direction parallel to the third surface. The multi-layer connection structure according to claim 4, wherein the hook is an elastic piece. The multi-layer connection structure according to claim 1, wherein the limiting part includes two first limiting strips arranged oppositely and a second limiting strip connecting the two first limiting strips; The positioning groove is surrounded by two first side walls arranged oppositely and a second side wall connecting the two first side walls, the limiting part is used to extend into the limiting groove, and the first limiting part The bar is against the first side wall, and the second limiting bar is against the second side wall. The multi-layer connection structure according to claim 7, wherein the two first side walls protrude toward the side of the limiting part to form a plurality of ribs, and the ribs are used to resist the two first limit strip. The multi-layer connection structure according to claim 7, wherein the first side wall includes an inclined plane connected to the third surface and a vertical plane connected to the inclined plane, the vertical plane is perpendicular to the third surface, and The inclined plane forms an obtuse angle with the third surface. The multi-layer connection structure according to claim 1, wherein the limiting portion is an elastic member, and the elastic member is interference-fitted with the limiting groove.

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