Knock-in type embedded expansion assembly

Abstract

The utility model discloses a knock-in type embedded expansion assembly, relates to the technical field of partition plate connection, and can solve the problem that an existing embedded part needs to be rotated, jacked, expanded and locked, so that the embedded part is troublesome to install. The knocking-in type embedded expansion assembly comprises an embedded part used for being embedded and fixed in a plate, and an expansion sleeve used for being knocked into the plate and arranged on the embedded part in a sleeving mode. The side, close to the embedded part, of the expansion sleeve is provided with an expansion seam, and the embedded part is provided with an expansion slope used for pushing the expansion sleeve to enable the expansion seam to expand.

Description

Technical Field

[0001] The utility model relates to the technical field of partition connection, in particular to a knock-in pre-buried expansion component. Background Art

[0002] Currently, in the furniture industry, cabinet shelves or partitions are usually connected using two-in-one or three-in-one connectors. When installing traditional two-in-one or three-in-one connectors, the cabinet must be laid down and assembled according to the steps.

[0003] When traditional three-in-one connectors are connected and installed, it is necessary to punch out a wheel mounting hole and an embedded part mounting hole on the first plate and the second plate respectively, as well as a connecting rod mounting hole located below the wheel mounting hole. When installing, generally the embedded part is first installed on the second plate, and then the connecting rod is screwed into the embedded part. Then, the first plate and the second plate that need to be connected are aligned, and the connector is inserted into the connector mounting hole. Then, the rotating wheel is installed in the wheel mounting hole of the first plate, and then the rotating wheel is screwed to complete the fastening of the first plate and the second plate.

[0004] Before the two panels are connected and installed, the existing expansion and fixing method of the embedded parts is to use other parts to screw in to expand their shape, thereby achieving the effect of fastening the embedded parts to the second panel. Not only is the installation of the embedded parts more troublesome, but the existing embedded parts need to be connected and fastened with the connecting parts before the two panels are installed. After the assembly is completed, the cabinet partitions cannot be freely disassembled and combined, and improvement is urgently needed.

[0005] Therefore, the inventor designed a knock-in pre-buried expansion component and proposed this application. Summary of the Invention

[0006] The purpose of this application is to provide a knock-in embedded expansion component to solve the problem that the existing embedded parts need to be rotated, pressed, expanded and locked, which makes the installation of the embedded parts difficult.

[0007] In order to solve the above technical problems, the present invention adopts the following solutions:

[0008] The present application provides a knock-in pre-embedded expansion assembly, comprising an embedded part for being embedded and fixed in a plate, and an expansion sleeve for being knocked into the plate and sleeved on the embedded part;

[0009] An expansion slot is provided on one side of the expansion sleeve close to the embedded part, and an expansion slope is provided on the embedded part for pushing the expansion sleeve to expand the expansion slot.

[0010] Optionally, a plurality of anti-slip annular protrusions are provided on the outer peripheral wall of the expansion sleeve.

[0011] Optionally, clamping protrusions are provided on both sides of the embedded part, and a clamping groove adapted to the clamping protrusion is provided on a side of the expansion sleeve close to the embedded part.

[0012] Optionally, a waist-shaped through cavity for mounting on the embedded part is provided in the expansion sleeve;

[0013] An end guide plate arranged obliquely downward is provided in the waist-shaped through cavity of the expansion sleeve;

[0014] One end of the expansion sleeve away from the embedded part is provided with a limiting step for preventing the end head from falling out, and the limiting step is located obliquely above the end head guide plate.

[0015] Optionally, a supporting inclined surface for supporting the end guide plate is provided on one side of the top of the embedded part, and a horizontal end limiting surface is provided on the other side of the top of the embedded part;

[0016] When the expansion sleeve is installed on the embedded part, the end limit surface is located directly below the limit step.

[0017] Optionally, an end-positioning plate connected to the bottom of the end guide plate is horizontally arranged in the waist-circular through cavity of the expansion sleeve;

[0018] When the expansion sleeve is installed on the embedded part, the horizontal height of the end limit surface is flush with or higher than the top surface height of the end position plate.

[0019] Optionally, the side of the end guide plate facing the limiting step is concavely curved.

[0020] Optionally, the cross-sectional shape of the expansion sleeve is waist-shaped or gourd-shaped;

[0021] The cross-sectional shape of the embedded part is a waist-shaped or gourd-shaped shape that matches the cross-sectional shape of the expansion sleeve.

[0022] Optionally, the cross-sectional shape of the expansion sleeve and the embedded part are both gourd-shaped, formed by splicing two circles, one large and one small.

[0023] Optionally, a second installation step is further provided at the bottom of the embedded part.

[0024] Beneficial effects of the utility model:

[0025] The expansion assembly of the present application includes an embedded part and an expansion sleeve. Since the embedded part is provided with an expansion slope, the cross-sectional size of the embedded part at the expansion slope is larger than the inner circumferential wall size of the expansion sleeve. After the embedded part and the expansion sleeve are assembled into an assembly, the installation can be completed by directly using a tool to knock the expansion sleeve so that it is completely fitted onto the embedded part. In the process of knocking in the expansion sleeve, the expansion slope will press the inner circumferential wall of the expansion sleeve, so that the side of the expansion sleeve with the expansion seam will expand toward the outer circumferential direction, and the expandable sleeve can be completely locked with the second plate.

[0026] Therefore, when installing the expansion component, the present application can fix the expansion component to the second plate by knocking with a tool. The installation process is extremely convenient and can effectively solve the problem that the existing embedded parts need to be rotated, pressed, expanded and locked, which makes the installation of the embedded parts troublesome. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the present application.

[0028] Figure 2 This is a schematic diagram of the three-dimensional explosion structure of Example 1 of the present application.

[0029] Figure 3 This is a schematic diagram of the cross-sectional explosion structure of Example 1 of the present application.

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of the expansion sleeve in Example 1 of the present application.

[0031] Figure 5 This is a schematic diagram of the top view of the structure of Example 1 of the present application.

[0032] Figure 6 This is a schematic diagram of the three-dimensional structure of Example 2 of the present application.

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the rod sleeve assembly in Example 2 of the present application when the interior is exposed.

[0034] Figure 8 This is a schematic diagram of the cross-sectional structure of Example 2 of the present application when in use.

[0035] Description of the accompanying figures: 1-rod sleeve assembly, 11-connecting rod body, 111-first end, 112-second end, 113-first conical surface, 114-second conical surface, 115-limiting protrusion, 12-connecting rod housing, 121-locking external thread, 122-housing connecting clamp, 123-housing connecting clamp groove, 124-first mounting step, 125-spring mounting groove, 13-spring body, 2-rotating wheel, 3-expansion assembly, 31-embedded part, 311 -Expansion inclined surface, 312-Support inclined surface, 313-Clamping protrusion, 314-End limiting surface, 315-Second installation step, 32-Expansion sleeve, 321-Waist-round through cavity, 322-Expansion seam, 323-Clamping slot, 324-Anti-slip ring protrusion, 325-End guide inclined plate, 326-Limiting step, 327-End in place flat plate, 4-First plate, 41-Connecting rod mounting hole, 42-Wheel mounting hole, 5-Second plate, 51-Embedded part mounting hole. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Example 1:

[0041] like Figures 1 to 5 As shown, this embodiment provides a knock-in embedded expansion assembly 3, comprising an embedded part 31 for being embedded and fixed in a plate, and an expansion sleeve 32 for being knocked into the plate and sleeved on the embedded part 31;

[0042] An expansion slit 322 is provided on one side of the expansion sleeve 32 close to the embedded part 31 , and an expansion slope 311 is provided on the embedded part 31 for pushing the expansion sleeve 32 to expand the expansion slit 322 .

[0043] The expansion assembly 3 of this embodiment includes an embedded part 31 and an expansion sleeve 32. Since the embedded part 31 is provided with an expansion slope 311, the cross-sectional size of the embedded part 31 at the expansion slope 311 is larger than the inner circumferential wall size of the expansion sleeve 32. After the embedded part 31 and the expansion sleeve 32 are assembled into an assembly, the expansion sleeve 32 is knocked into the embedded part 31 with a tool to complete the installation. In the process of knocking in the expansion sleeve 32, the expansion slope 311 will press the inner circumferential wall of the expansion sleeve 32, so that the side of the expansion sleeve 32 having the expansion seam 322 expands toward the outer circumferential direction, and the expansion sleeve 32 is completely locked with the second plate 5.

[0044] Therefore, when installing the expansion component 3, the present application can install and fix the expansion component 3 to the second plate 5 by knocking with a tool. The installation process is extremely convenient and can effectively solve the problem that the existing embedded parts 31 need to be rotated, pressed, expanded and locked, which makes the installation of the embedded parts 31 troublesome.

[0045] Specifically, in this embodiment, Figures 1 to 5 As shown, the outer wall of the expansion sleeve 32 is provided with a plurality of anti-slip annular protrusions 324. By providing the anti-slip annular protrusions 324, this embodiment can improve the locking force between the expansion sleeve 32 and the second plate 5 after deformation, thereby preventing the expansion sleeve 32 from falling out. The cross-sectional shape of the anti-slip annular protrusions 324 in this embodiment can be a right-angled triangle, with its inclined surface tilted downward, and one of the right-angled sides perpendicular to the outer wall of the expansion sleeve 32, so that the provision of the anti-slip annular protrusions 324 does not affect the insertion of the expansion sleeve 32. At the same time, when the expansion sleeve 32 is pulled outward and tends to fall out, its right-angled side can form a blocking structure to prevent the expansion sleeve 32 from falling out. Of course, in some embodiments, the cross-sectional shape of the anti-slip annular protrusions 324 can also be designed as an obtuse triangle, an acute triangle, or a rectangle, etc., which are not given as examples here. In some embodiments, technicians can also replace the anti-slip annular protrusions 324 with external threads or other anti-slip structures, which are not given as examples here.

[0046] Specifically, in this embodiment, Figures 1 to 3 As shown, the embedded part 31 is provided with clamping protrusions 313 on both sides, and the expansion sleeve 32 is provided with a clamping groove 323 adapted to the clamping protrusions 313 on the side near the embedded part 31. When the expansion sleeve 32 is hammered onto the embedded part 31, the clamping protrusions 313 are completely locked into the clamping grooves 323, thereby completely clamping the expansion sleeve 32 and the embedded part 31 through the clamping protrusions 313 and the clamping protrusions 313. In this embodiment, the clamping protrusions 313 and the clamping grooves 323 are both ratchet-shaped structures, which facilitates locking while preventing the clamping protrusions 313 from falling out of the clamping grooves 323. In some embodiments, the clamping protrusions 313 and the clamping grooves 323 can also adopt other tooth-shaped structures, which will not be described in detail here.

[0047] Specifically, in this embodiment, Figures 2 to 4 As shown, the expansion sleeve 32 is provided with a waist-shaped through cavity 321 for installation on the embedded part 31;

[0048] An end guide plate 325 is provided in the waist-shaped through cavity 321 of the expansion sleeve 32 and is tilted downward.

[0049] The end of the expansion sleeve 32 away from the embedded part 31 is provided with a limiting step 326 for preventing the end head from falling out. The limiting step 326 is located obliquely above the end head guide plate 325. By providing the inclined end head guide plate 325, after the second end head 112 moves to the expansion assembly 3, as the first plate 4 moves, the entire connecting rod body 11 continues to move toward the second end head 112. Under the action of the elastic member body, the second end head 112 will continue to press against the end head guide plate 325 until the second end head 112 moves below the limiting step 326. At this time, the first plate 4 and the second plate 5 only need to rotate the rotating wheel 2 to be completely locked. In this state, when moving the second plate 5 to separate from the first plate 4, it is only necessary to overcome the elastic force of the elastic member body.

[0050] Specifically, in this embodiment, Figure 2 and Figure 3 As shown, one side of the top of the embedded part 31 is provided with a supporting inclined surface 312 for supporting the end guide plate 325, and the other side of the top of the embedded part 31 is provided with a horizontal end limiting surface 314;

[0051] When the expansion sleeve 32 is installed on the embedded component 31 , the end stop surface 314 is located directly below the stop step 326 .

[0052] The waist-shaped through cavity 321 of the expansion sleeve 32 is also horizontally provided with an end-positioning flat plate 327 connected to the bottom of the end guide plate 325;

[0053] When the expansion sleeve 32 is installed on the embedded part 31, the horizontal height of the end limit surface 314 is flush with or higher than the top surface height of the end position plate 327, so that after the rotating wheel 2 is screwed to loosen the first plate 4 and the second plate 5, the second end 112 is pressed on the end limit surface 314 under the action of the elastic member or is in a naturally relaxed state and close to the end limit surface 314, which facilitates the second end 112 to move to the end position plate 327 and the end guide plate 325 without being stuck, thereby preventing the second end 112 from being unable to move out of the expansion assembly 3.

[0054] Specifically, in this embodiment, Figure 4 and Figure 5 As shown, the side of the end guide plate 325 facing the limiting step 326 is concavely curved to facilitate guiding.

[0055] Specifically, in this embodiment, Figures 1 to 5 As shown, the cross-sectional shape of the expansion sleeve 32 is gourd-shaped;

[0056] The cross-sectional shape of the embedded part 31 is a gourd shape that matches the cross-sectional shape of the expansion sleeve 32. In some embodiments, the cross-sectional shape of the expansion sleeve 32 and the embedded part 31 can also be a round shape or other shapes, which will not be described in detail here.

[0057] Furthermore, the cross-sectional shapes of the expansion sleeve 32 and the embedded component 31 are both gourd-shaped, formed by splicing two circles, one large and one small, to avoid incorrect installation direction of the embedded component 31.

[0058] Specifically, in this embodiment, Figures 1 to 3 As shown, a second installation step 315 is further provided at the bottom of the embedded part 31 to facilitate confirmation that the expansion sleeve 32 is installed in place.

[0059] Example 2:

[0060] Based on the above embodiment 1, Figures 6 to 8 As shown, this embodiment provides a connection system for partition installation, which also includes a rotating wheel 2 for installation on the first plate 4 and a rod sleeve assembly 1 for connecting and locking the first plate 4 and the second plate 5, wherein:

[0061] The rod sleeve assembly 1 includes a housing assembly and a connecting rod body 11 disposed within the housing assembly and reciprocating along its axis. Both ends of the connecting rod body 11 extend outside the housing assembly and are respectively provided with a first end 111 for engaging with the rotating wheel 2 and a second end 112 for engaging with the expansion assembly 3.

[0062] The rod sleeve assembly 1 further includes an elastic member body for pushing the connecting rod body 11 to move toward the second end 112 . The elastic member body is sleeved on the connecting rod body 11 and is located in the housing assembly.

[0063] This embodiment redesigns the rod sleeve assembly 1 with a first end 111 and a second end 112, so that after the rotating wheel 2 and the expansion assembly 3 are respectively installed on the first plate 4 and the second plate 5, the rod sleeve assembly 1 can be inserted into the first plate 4. Since the connecting rod body 11 in the rod sleeve assembly 1 can move back and forth in the shell assembly, the first plate 4 and the second plate 5 can be directly pressed and pushed to the corresponding position of the second plate 5 when connected and installed, so that the second end 112 of the rod sleeve assembly 1 is stuck in the expansion assembly 3, and then the rotating wheel 2 is driven to rotate, and the connecting rod body 11 is driven to move toward the first end 111, so that the second end 112 and the expansion assembly 3, as well as the first end 111 and the rotating wheel 2 are locked, and then the first plate 4 and the second plate 5 are locked.

[0064] In this embodiment, to disassemble the first plate 4 and the second plate 5, the rotating wheel 2 can be directly screwed to move the connecting rod body 11 toward the second end 112. At this time, the second end 112 and the expansion component 3 are no longer completely locked. At this time, the first plate 4 can be pushed or pulled out of the second plate 5. When pushing or pulling the first plate 4 and the second plate 5 to separate, it is only necessary to overcome the elastic force of the elastic member body. The separation process of the first plate 4 and the second plate 5 is relatively easy and convenient.

[0065] Therefore, in this embodiment, the mutual cooperation of the rotating wheel 2, the specially designed rod sleeve assembly 1 and the expansion assembly 3 makes the connection system and connection process reconstructed by this application completely overturn the traditional cabinet installation process, so that before the first plate 4 and the second plate 5 are completely locked, the first plate 4 can easily overcome the elastic force of the elastic member body to be clamped in or out of the expansion assembly 3 of the second plate 5, and after the first plate 4 and the second plate 5 are locked, the first end 111 and the second end 112 of the connecting rod body 11 are completely clamped in the rotating wheel 2 and the expansion assembly 3 respectively, and under the action of tension, the connection between the first plate 4 and the second plate 5 can be made extremely firm; the locking state and the loosening state of the first plate 4 and the second plate 5 of this application can be achieved only by screwing the rotating wheel 2, so that the installation and disassembly of the first plate 4 and the second plate 5 are extremely convenient, which can not only achieve the technical effect that each layer and partition can be disassembled and combined at any time, but also reduce the labor intensity of workers, greatly reduce the risk of on-site installation for workers, and improve the efficiency of cabinet installation.

[0066] Specifically, in this embodiment, Figure 7 As shown, the connecting rod body 11 is further provided with a limiting protrusion 115 located inside the housing assembly;

[0067] One end of the elastic member body presses on the limiting protrusion 115, and the other end presses on the shell assembly. By setting the elastic member body, after the rod sleeve assembly 1 is installed in the first plate 4, the second end 112 tends to extend outward under the elastic force of the elastic member body. In the process of installing and connecting the first plate 4 and the second plate 5, after the first plate 4 is pressed on the second plate 5, the compressed elastic member body will continue to apply pressure to the limiting protrusion 115, so that after the second end 112 moves to the corresponding position, the second end 112 of the connecting rod body 11 can be smoothly inserted into the expansion assembly 3 under the elastic force of the elastic member body, thereby realizing the preliminary connection between the first plate 4 and the second plate 5. At this time, the first plate 4 and the second plate 5 are in an unlocked and relaxed state.

[0068] Specifically, in this embodiment, Figure 7As shown, the main body of the elastic member is a helical spring. Those skilled in the art can also set the main body of the elastic member as an elastic structure such as a wave spring or a disc spring according to needs, and no further examples will be given here.

[0069] Specifically, in this embodiment, as Figure 6 and Figure 7 shown, the housing assembly includes two connecting rod housings 12 that are arranged in a buckled manner;

[0070] An elastic member installation groove is provided in the connecting rod housing 12. After the elastic member installation grooves of the two connecting rod housings 12 are buckled, a sealed cavity can be formed. The main body of the elastic member and the limiting protrusion 115 are both located in the sealed cavity formed by the two elastic member installation grooves. The two connecting rod housings 12 arranged in a buckled manner set in this embodiment can facilitate the installation of the main body of the elastic member.

[0071] Specifically, in this embodiment, the cross-sectional shape of the connecting rod housing 12 is semi-circular. In some embodiments, those skilled in the art can also set the cross-sectional shape of the connecting rod housing 12 as any one or combination of a C-shaped or U-shaped, and no further details will be given here.

[0072] Specifically, in this embodiment, as Figure 6 and Figure 7 shown, the two connecting rod housings 12 have the same structure, which can reduce the manufacturing cost of the connecting rod housing 12;

[0073] On one end face of the connecting rod housing 12, a number of housing connection lugs 122 are provided, and on the other end face, a number of housing connection slots 123 are provided;

[0074] The two connecting rod housings 12 are buckled and fixed by the housing connection lugs 122 and the housing connection slots 123. Through the snap-fitting fixation, the two connecting rod housings 12 can form a cylindrical housing assembly after being buckled and pressed together, which is convenient for installation. In some embodiments, connection methods such as bolt connection can also be used, and no further examples will be given here.

[0075] Specifically, in this embodiment, as Figure 6 and Figure 7 shown, one end of the connecting rod housing 12 close to the second end 112 is provided with a first installation step 124, which is convenient for the staff to judge whether the rod sleeve assembly 1 is knocked in place when knocking it in.

[0076] Specifically, in this embodiment, as Figure 6 and Figure 7As shown, the outer peripheral wall of the connecting rod housing 12 is also provided with an anti-slip thread to increase the connection friction between the housing assembly and the first plate 4, and prevent the rod sleeve assembly 1 from falling out after being installed in the first plate 4. In some embodiments, technicians can replace the anti-slip thread with several annular protrusion structures, which will not be given as examples here.

[0077] Specifically, in this embodiment, Figure 6 and Figure 7 As shown, the first end 111 and the second end 112 are both larger than the connecting rod body 11;

[0078] A first diameter-reduced section is provided on a side of the first end 111 facing the housing assembly;

[0079] A second reduced diameter section is provided on a side of the second end 112 facing away from the housing assembly;

[0080] The first and second diameter-reducing sections are both directed from the first end 111 toward the second end 112. The first and second diameter-reducing sections facilitate the first end 111 to fit into the rotating wheel 2 and the second end 112 to fit into the expansion assembly 3.

[0081] Specifically, in this embodiment, Figure 6 and Figure 7 The outer peripheral wall of the first diameter-reduced section is curved, so that the rotating wheel 2 pulls the first end head 111 more smoothly.

[0082] In this embodiment, when connecting the panels of the cabinet, follow the steps below:

[0083] S1. Open an embedded mounting hole on the second plate 5 and knock the expansion assembly 3 into the embedded mounting hole of the second plate 5;

[0084] S2. Open a rotating wheel mounting hole 42 and a connecting rod mounting hole 41 on the first plate 4, and install the rotating wheel 2 into the rotating wheel mounting hole 42;

[0085] S3, knock the rod sleeve assembly 1 into the connecting rod mounting hole 41, and make its first end 111 snap into the rotating wheel 2;

[0086] S4 , first press the first plate 4 onto the second plate 5 and move the first plate 4 so that the second end 112 of the connecting rod body 11 is inserted into the expansion assembly 3 .

[0087] S5 , rotating the rotating wheel 2 to drive the connecting rod body 11 to move toward the first end 111 , so that the first plate 4 and the second plate 5 are completely locked.

[0088] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described again here.

[0089] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A knock-in pre-buried expansion assembly, characterized in that: It comprises an embedded part (31) for being embedded and fixed in a plate, and an expansion sleeve (32) for being knocked into the plate and sleeved on the embedded part (31); An expansion slit (322) is provided on one side of the expansion sleeve (32) close to the embedded part (31), and an expansion inclined surface (311) for pushing the expansion sleeve (32) to expand the expansion slit (322) is provided on the embedded part (31).

2. A knock-in pre-buried expansion assembly according to claim 1, characterized in that: A plurality of anti-slip ring protrusions (324) are provided on the outer peripheral wall of the expansion sleeve (32).

3. The knock-in pre-buried expansion assembly according to claim 1, characterized in that: Clamping protrusions (313) are provided on both sides of the embedded part (31), and a clamping groove (323) adapted to the clamping protrusion (313) is provided on one side of the expansion sleeve (32) close to the embedded part (31).

4. The knock-in pre-buried expansion assembly according to claim 1, characterized in that: The expansion sleeve (32) is provided with a waist-shaped through cavity (321) for being installed on the embedded part (31); An end guide plate (325) arranged obliquely downward is provided in the waist-shaped through cavity (321) of the expansion sleeve (32); One end of the expansion sleeve (32) away from the embedded part (31) is provided with a limiting step (326) for preventing the end head from falling out, and the limiting step (326) is located obliquely above the end head guide plate (325).

5. The knock-in pre-buried expansion assembly according to claim 4, characterized in that: One side of the top of the embedded part (31) is provided with a supporting inclined surface (312) for supporting the end guide plate (325), and the other side of the top of the embedded part (31) is provided with a horizontal end limiting surface (314); When the expansion sleeve (32) is installed on the embedded part (31), the end limiting surface (314) is located directly below the limiting step (326).

6. The knock-in pre-buried expansion assembly according to claim 5, characterized in that: An end-positioning plate (327) connected to the bottom of the end guide plate (325) is also horizontally arranged in the waist-circular through cavity (321) of the expansion sleeve (32); When the expansion sleeve (32) is installed on the embedded part (31), the horizontal height of the end stop surface (314) is flush with or higher than the top surface height of the end position plate (327).

7. The knock-in pre-buried expansion assembly according to claim 4, characterized in that: The side of the end guide plate (325) facing the limiting step (326) is concavely curved.

8. The knock-in pre-buried expansion assembly according to claim 4, characterized in that: The cross-sectional shape of the expansion sleeve (32) is a waist circle or a gourd shape; The cross-sectional shape of the embedded part (31) is a waist-shaped or gourd-shaped shape that matches the cross-sectional shape of the expansion sleeve (32).

9. The knock-in pre-buried expansion assembly according to claim 8, characterized in that: The cross-sectional shape of the expansion sleeve (32) and the embedded part (31) are both gourd-shaped, formed by splicing two circles, one large and one small.

10. The knock-in pre-buried expansion assembly according to claim 1, characterized in that: A second installation step (315) is also provided at the bottom of the embedded part (31).

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