Splicing type screen support using mortise and tenon joint structure

Abstract

The utility model provides a splicing type screen support using a mortise and tenon joint structure. The splicing type screen support comprises a base, an inner supporting column, an outer limiting sleeve and a first support assembly. The first bracket assembly comprises a tenon and a first support arm part; one end of the inner supporting column is arranged on the base; at least one mortise corresponding to the tenon is formed in the side portion of the inner supporting column, and the tenon is connected with the mortise in a matched mode. The outer limiting sleeve is provided with a bottom hole and a first clamping groove, the other end of the inner supporting column penetrates through the outer limiting sleeve from the bottom hole, the tenon and the mortise are wrapped with the inner side of the first clamping groove, and the first supporting arm part extends out of an opening of the first clamping groove. The tenon-and-mortise structure is limited through the first clamping groove of the outer limiting sleeve, and splicing and locking of the whole support are rapidly completed.

Description

Technical Field

[0001] This application relates to the field of display screen bracket technology, and in particular to a splicing screen bracket utilizing a mortise and tenon structure. Background Technology

[0002] Splicing screen brackets are support devices that enable flexible combination and positioning of multiple displays. Through modular design, these brackets integrate multiple screens into a single display, aiming to optimize efficiency, comfort, and space utilization in multi-screen work scenarios.

[0003] Most multi-screen splicing brackets on the market today use a structure of metal positioning sleeves and screw locking, or a ball head and snap-on structure.

[0004] However, the existing multi-screen splicing bracket structure makes the installation of the screen bracket relatively complicated. Utility Model Content

[0005] In view of the above problems, this application is made in order to provide a splicing screen bracket using a mortise and tenon structure that overcomes or at least partially solves the above problems.

[0006] This application discloses a splicing screen bracket using a mortise and tenon structure, comprising: a base, an inner support column, an outer limiting sleeve, and a first bracket assembly; the first bracket assembly includes a tenon and a first arm portion.

[0007] One end of the inner support column is disposed on the base;

[0008] The side of the inner support column is provided with at least one mortise corresponding to the tenon, and the tenon is connected to the mortise by fitting together.

[0009] The outer limiting sleeve has a bottom hole and a first slot. The other end of the inner support column passes through the bottom hole into the outer limiting sleeve. The inner side of the first slot covers the tenon and the mortise. The first support arm extends out from the opening of the first slot.

[0010] Furthermore, it also includes: a second support assembly; the second support assembly includes: a snap-fit ​​block and a second arm portion;

[0011] The outer limiting sleeve is provided with a second slot, and at least one limiting slot is provided on the inner side of the second slot;

[0012] The inner support column is provided with an abutment limiting strip corresponding to the second slot;

[0013] The snap-fit ​​block is connected between the limiting slot and the abutting limiting strip, and the snap-fit ​​block extends out from the opening of the second slot and is connected to the second support arm.

[0014] Furthermore, the inner side of the second card slot is provided with a magnetic block corresponding to the limiting slot; the card block is a magnetic component;

[0015] The magnetic block and the snap-fit ​​block are magnetically attached to each other.

[0016] Furthermore, the first support arm includes: front and rear side rotating rods, a first horizontal side rotating rod, and a first connecting seat;

[0017] One end of the front and rear side rotating rods is connected to the tenon, and the other end of the front and rear side rotating rods is connected to one end of the first horizontal side rotating rod; the other end of the first horizontal side rotating rod is connected to the first connecting seat.

[0018] Furthermore, the second support arm includes: a second horizontal side rotating rod and a second connecting seat;

[0019] One end of the second horizontal rotating rod is connected to the snap-fit ​​block, and the other end of the second horizontal rotating rod is connected to the second connecting seat.

[0020] Furthermore, the base includes: a clamping seat, an adjusting rod, and a support plate;

[0021] One end of the inner support column is disposed on one side of the top plate of the clamping seat; the support plate is disposed on the other side of the top plate;

[0022] The adjusting rod is movably connected to and passes through the base plate of the clamping seat via a thread; a gasket is provided at one end of the adjusting rod near the top plate;

[0023] When the base is installed on the tabletop, the support plate and the gasket are clamped on both sides of the tabletop.

[0024] Furthermore, the first bracket assembly includes four groups; the mortise includes at least four; each group of the first bracket assembly is respectively connected to one of the mortise; and every two groups of the first bracket assembly are respectively disposed on both sides of the abutment limiting strip.

[0025] Furthermore, the second bracket assembly includes two sets; the limiting slot includes at least two; each set of the second bracket assembly is respectively connected to one of the limiting slots.

[0026] Furthermore, the outer limiting sleeve has a top hole on the side away from the bottom hole; the top hole is covered with a removable cap.

[0027] Furthermore, the base has a limiting insertion hole on the side near the inner support column; the outer limiting sleeve has a limiting protrusion corresponding to the limiting insertion hole on the side near the base; the limiting insertion hole and the limiting protrusion are engaged and connected.

[0028] This application has the following advantages:

[0029] In the embodiments of this application, addressing the complexity of screen bracket installation caused by existing multi-screen splicing bracket structures, this application provides a solution for limiting the mortise and tenon structure using the first slot of the outer limiting sleeve. Specifically: one end of the inner support column is disposed on the base; the side of the inner support column has at least one mortise corresponding to the tenon, and the tenon and mortise are connected by mating; the outer limiting sleeve has a bottom hole and a first slot, and the other end of the inner support column passes through the bottom hole into the outer limiting sleeve; the inner side of the first slot covers the tenon and mortise, and the first arm extends out from the opening of the first slot. By limiting the mortise and tenon structure using the first slot of the outer limiting sleeve, the splicing and locking of the entire bracket can be completed quickly. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the first structure of a splicing screen bracket using a mortise and tenon structure according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the second structure of a splicing screen bracket utilizing a mortise and tenon structure according to an embodiment of this application;

[0033] Figure 3 This is a first exploded structural diagram of a splicing screen bracket utilizing a mortise and tenon structure according to an embodiment of this application;

[0034] Figure 4 This is a second exploded structural diagram of a splicing screen bracket utilizing a mortise and tenon structure provided in an embodiment of this application;

[0035] Figure 5 This is a partial cross-sectional view of a splicing screen bracket using a mortise and tenon structure provided in an embodiment of this application;

[0036] Figure 6 This is a bottom view of the outer and middle limiting sleeves and the second support assembly provided in an embodiment of this application.

[0037] The attached figures are labeled as follows:

[0038] 1. Base; 11. Clamping seat; 111. Top plate; 112. Bottom plate; 12. Adjusting rod; 121. Shim; 13. Support plate; 14. Limiting insertion hole; 2. Inner support column; 21. Tenon; 22. Abutting limiting strip; 3. Outer limiting sleeve; 31. Bottom hole; 32. First slot; 33. Second slot; 331. Limiting slot; 332. Magnetic block; 34. Top hole; 35. Sealing cap; 36. Limiting protrusion; 4. First bracket assembly; 41. Tenon; 42. First arm; 421. Front and rear side rotating rods; 422. First horizontal side rotating rod; 423. First connecting seat; 5. Second bracket assembly; 51. Snap-fit ​​block; 52. Second arm; 521. Second horizontal side rotating rod; 522. Second connecting seat. Detailed Implementation

[0039] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] The inventors discovered through analysis of existing technologies that the fundamental reason why the installation of screen brackets is relatively complicated by existing multi-screen splicing bracket structures is that existing technical solutions require a large number of connecting and fastening structures to ensure the installation stability of multiple screens. During installation, adjustment, or maintenance, each fastening structure needs to be adjusted and locked individually to ensure the stability of the display screen installation.

[0041] At the same time, although existing technical solutions can meet general fixed requirements, there are still some usage issues, such as:

[0042] 1) Each screw or clip needs to be tightened individually to complete the splicing of multiple rods. Screwdrivers, hex wrenches and other tools must be carried when moving and temporarily setting up the exhibition. The operation is cumbersome and fasteners are easy to miss.

[0043] 2) The addition or removal of modular side brackets and middle brackets usually relies on thread or pin engagement. When the quantity changes, the level needs to be readjusted section by section, resulting in poor overall screen posture consistency and a significant increase in assembly time.

[0044] 3) During long-term disassembly and assembly, screw wear and clip fatigue can easily lead to a decrease in locking force; at the same time, if fasteners are lost, they cannot be quickly replaced, posing a risk of screen drop.

[0045] 4) To protect the threads and ball end, additional foam channels or separator boxes are often required, which increases the volume and cost of logistics.

[0046] Reference Figure 1-6This application illustrates an embodiment of a splicing screen bracket utilizing a mortise and tenon structure, comprising: a base 1, an inner support column, an outer limiting sleeve, and a first bracket assembly; the first bracket assembly includes a tenon 41 and a first support arm 42;

[0047] One end of the inner support column is disposed on the base 1;

[0048] The side of the inner support column is provided with at least one mortise 21 corresponding to the tenon 41, and the tenon 41 is connected to the mortise 21.

[0049] The outer limiting sleeve has a bottom hole 31 and a first slot 32. The other end of the inner support column passes through the bottom hole 31 into the outer limiting sleeve. The inner side of the first slot 32 covers the tenon 41 and the mortise 21. The first support arm 42 extends out from the opening of the first slot 32.

[0050] In the embodiments of this application, addressing the complexity of screen bracket installation caused by existing multi-screen splicing bracket structures, this application provides a solution for limiting the mortise and tenon structure using the first slot 32 of the outer limiting sleeve. Specifically: one end of the inner support column is disposed on the base 1; the side of the inner support column has at least one mortise 21 corresponding to the tenon 41, and the tenon 41 and the mortise 21 are connected; the outer limiting sleeve has a bottom hole 31 and a first slot 32, and the other end of the inner support column passes through the bottom hole 31 into the outer limiting sleeve; the inner side of the first slot 32 covers the tenon 41 and the mortise 21, and the first support arm 42 extends out from the opening of the first slot 32. By limiting the mortise and tenon structure using the first slot 32 of the outer limiting sleeve, the splicing and locking of the entire bracket can be completed quickly.

[0051] The following will further describe a splicing screen bracket utilizing a mortise and tenon structure in this exemplary embodiment.

[0052] It should be noted that the first slot 32 can be disposed on the side of the outer limiting sleeve; when there are two first slots 32, the two first slots 32 can be disposed on the two sides of the outer limiting sleeve respectively; multiple tenons 21 can be symmetrically disposed on both sides of the inner support column to quickly connect multiple first bracket assemblies on both sides of the inner support column. Since the bracket structure does not contain independent screws or washers, the installation process of tightening screws can be eliminated, and installation can be carried out without the aid of tools, greatly improving assembly efficiency.

[0053] Reference Figure 3 and Figure 5 In one embodiment of this application, it further includes: a second support assembly; the second support assembly includes: a snap-fit ​​block 51 and a second arm portion 52;

[0054] The outer limiting sleeve is provided with a second slot 33, and at least one limiting slot 331 is provided on the inner side of the second slot 33.

[0055] The inner support column is provided with an abutment limiting strip 22 corresponding to the second slot 33;

[0056] The snap-fit ​​block 51 is connected between the limiting slot 331 and the abutting limiting strip 22. The snap-fit ​​block 51 extends out from the opening of the second slot 33 and is connected to the second support arm 52.

[0057] It should be noted that the front side of the outer limiting sleeve can be protruding, and the interior of the protruding part has a second groove 33 in the vertical direction. The abutting limiting strip 22 can be disposed between a plurality of symmetrically arranged tenons 21; the abutting limiting strip 22 can be used to cooperate with the second groove 33 to limit the outer limiting sleeve and the second bracket assembly. The second groove 33 can be provided with a limiting post coaxial with the length direction of the second groove 33, and the limiting slots 331 can be distributed along the length direction of the limiting post; the locking block 51 can be provided with an opening that can be fitted onto the limiting post. The position of the limiting slots 331 can correspond to the tenons 21; when there are multiple limiting slots 331, the second bracket assembly can move within the second groove 33 to the target limiting slot 331 and then engage the locking block 51 with the target limiting slot 331.

[0058] After the outer limiting sleeve is installed, the outer limiting sleeve is used to restrict the movement of the tenon 41, and the abutting limiting strip 22 is used to restrict the movement of the second bracket assembly. Therefore, the positioning and locking of brackets in multiple different directions can be completed at one time with only one assembly action.

[0059] Reference Figure 4-5 In one embodiment of this application, a magnetic block 332 corresponding to the limiting slot 331 is provided on the inner side of the second card slot 33; the card block 51 is a magnetic component;

[0060] The magnetic block 332 is magnetically attached to the snap-fit ​​block 51.

[0061] It should be noted that the magnetic attraction block 332 and the snap-fit ​​block 51 are magnetically connected to maintain the position of the snap-fit ​​block 51 and prevent the second bracket assembly from detaching or falling off during installation. The tenon and mortise structure of the first bracket assembly and the magnetic attraction structure of the second bracket assembly can achieve high repeatability and durability.

[0062] Reference Figure 3In one embodiment of this application, the first support arm 42 includes: front and rear side rotating rods 421, a first horizontal side rotating rod 422, and a first connecting seat 423;

[0063] One end of the front and rear side rotating rods 421 is connected to the tenon 41, and the other end of the front and rear side rotating rods 421 is connected to one end of the first horizontal side rotating rod 422; the other end of the first horizontal side rotating rod 422 is connected to the first connecting seat 423.

[0064] It should be noted that one end of the front and rear side rotating rods 421 can be connected to the tenon 41 through a damping hinge seat; the front and rear side rotating rods 421 can be used to adjust the movement of the display in the front and rear direction; the first horizontal side rotating rod 422 can be used to adjust the rotation of the display in the horizontal direction; the first connecting seat 423 can be used to connect the display.

[0065] Reference Figure 3 In one embodiment of this application, the second support arm 52 includes: a second horizontal side rotating rod 521 and a second connecting seat 522;

[0066] One end of the second horizontal rotating rod 521 is connected to the snap-fit ​​block 51, and the other end of the second horizontal rotating rod 521 is connected to the second connecting seat 522.

[0067] It should be noted that the second horizontal rotating rod 521 can be used to adjust the rotation of the display in the horizontal direction; the second connecting seat 522 can be used to connect the display.

[0068] Reference Figure 2-3 In one embodiment of this application, the base 1 includes: a clamping seat 11, an adjusting rod 12, and a support plate 13;

[0069] One end of the inner support column is disposed on one side of the top plate 111 of the clamping seat 11; the support plate 13 is disposed on the other side of the top plate 111;

[0070] The adjusting rod 12 is movably connected to and passes through the base plate 112 of the clamping seat 11 via a thread; a gasket 121 is provided at one end of the adjusting rod 12 near the top plate 111;

[0071] When the base 1 is installed on the tabletop, the support plate 13 and the pad 121 are clamped on both sides of the tabletop.

[0072] It should be noted that the adjusting rod 12 may include at least one. By manually rotating the adjusting rod 12, the adjusting rod 12 causes the pad 121 to gradually rise to abut against the bottom surface of the tabletop under the action of the thread, and tightens the fit between the pad 121 and the tabletop. With the auxiliary support of the support plate 13, the locking installation of the base 1 is completed, so that the entire bracket can be clamped on tabletops of different thicknesses.

[0073] In one embodiment of this application, the first bracket assembly includes four groups; the mortise 21 includes at least four; each group of the first bracket assembly is respectively connected to one of the mortise 21; and every two groups of the first bracket assembly are respectively disposed on both sides of the abutment limiting strip 22.

[0074] It should be noted that when there are multiple mortises 21, the number of the first bracket components installed may not exceed the number of mortises 21.

[0075] In one embodiment of this application, the second bracket assembly includes two sets; the limiting slot 331 includes at least two; each set of the second bracket assembly is respectively connected to one of the limiting slots 331.

[0076] It should be noted that when there are multiple limiting slots 331, the number of the second bracket components installed may not exceed the number of limiting slots 331.

[0077] Reference Figure 3 In one embodiment of this application, the outer limiting sleeve has a top hole 34 on the side away from the bottom hole 31; the top hole 34 is covered by a removable cap 35.

[0078] It should be noted that when installing the outer limiting sleeve, the cap 35 can be removed first to allow the top hole 34 and bottom hole 31 to communicate with the atmosphere, thereby reducing the resistance of assembling the outer positioning sleeve; after the outer limiting sleeve is installed on the inner support column, the cap 35 can be reinstalled.

[0079] Reference Figure 3 and Figure 6 In one embodiment of this application, the base 1 is provided with a limiting insertion hole 14 on the side near the inner support column; the outer limiting sleeve is provided with a limiting protrusion 36 corresponding to the limiting insertion hole 14 on the side near the base 1; the limiting insertion hole 14 and the limiting protrusion 36 are connected in cooperation.

[0080] It should be noted that the limiting insertion hole 14 and the limiting protrusion 36 can improve the tightness of the assembly between the inner support column and the outer limiting sleeve, enabling the bracket to withstand stronger loads. The limiting protrusion 36 can be disposed at the second slot 33 of the protrusion. Multiple limiting insertion holes 14 and limiting protrusions 36 can be included; the limiting insertion holes 14 and limiting protrusions 36 can correspond one-to-one.

[0081] In one specific implementation, a splicing screen bracket utilizing a mortise and tenon structure, as described in the embodiments of this application, can be assembled in the following manner:

[0082] First, fix the base 1 to the edge of the tabletop. The clamping seat 11 of the base 1 is naturally fitted onto the edge of the tabletop. By manually rotating the adjusting rod 12, the washer 121 at the top of the adjusting rod 12 is pushed upward by the thread side, gradually abutting against the lower surface of the tabletop. At the same time, the support plate 13 extending forward from the top of the clamping seat 11 abuts against the upper surface of the tabletop, forming a firm and reliable three-point clamping structure. At this time, the inner support column that is fixedly connected to the top of the clamping seat 11 extends vertically upward, becoming the main load-bearing rod for subsequent structural installation.

[0083] Then, according to the requirements, several first bracket components are assembled on the left and right sides of the inner support column: each first bracket component is directly inserted into the pre-set dovetail mortise 21 at the end of the inner support column through its tenon 41 part. After insertion, the damping hinge seat outside the tenon 41, combined with the front and rear side rotating rods 421 and the first horizontal side rotating rod 422, can provide the installed display with the freedom of front and rear tilt and horizontal angle adjustment.

[0084] Then, remove the cap 35 of the outer limiting sleeve and put the outer limiting sleeve down from the top of the inner support column. At this time, the first slot 32 on the outer limiting sleeve is offset from the position of the tenon 41 and the damping hinge seat that have been installed on the inner support column to avoid interference and allow the outer limiting sleeve to descend smoothly.

[0085] Then, when the outer limiting sleeve moves down to the area of ​​the abutting limiting strip 22 near the middle of the inner support column, the snap-fit ​​block 51 of the second bracket assembly can be inserted from the opening of the second slot 33 on the front side of the outer limiting sleeve, slide down along the second slot 33 to the target height, and after reaching the appropriate position, the snap-fit ​​block 51 moves horizontally to snap into the limiting slot 331, and is automatically attracted and locked by the magnetic block 332 to ensure that the second bracket assembly is stably fixed.

[0086] Then, continue pressing down the outer limiting sleeve until its bottom end completely covers the top of the base 1. At this time, the outer shell of the outer limiting sleeve plays a limiting and anti-disengagement role for the tenon 41 of the first bracket assembly. At the same time, the abutting limiting strip 22 on the inner support column provides a horizontal limiting for the second bracket assembly. After assembly, the limiting protrusion 36 of the outer limiting sleeve will also be inserted into the limiting insertion hole 14 of the base 1. The limiting protrusion 36 and the limiting insertion hole 14 can be an interference fit to enhance the positioning and load-bearing capacity of the overall outer limiting sleeve. Thus, all the first and second bracket assemblies can be locked and fixed synchronously with just one pressing action of the outer limiting sleeve, without the need for individual locking.

[0087] Finally, tighten the cap 35 to complete the assembly. Users can adjust the angle and position of each display piece as needed by rotating the levers to achieve quick assembly, stable support, and multi-angle adjustment.

[0088] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0089] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0090] The foregoing has provided a detailed description of a splicing screen bracket utilizing a mortise and tenon structure. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A spliced screen support using a mortise and tenon structure, characterized by, The utility model provides a kind of adjustable desk, including: Base, inner support column, outer limiting sleeve and first support assembly;The first support assembly includes tenon and first arm part; One end of the inner support column is arranged in the base; The side of the inner support column is provided with at least one mortise corresponding to the tenon, and the tenon is connected with the mortise; The outer limiting sleeve is provided with a bottom hole and a first clamping groove, the other end of the inner support column is arranged in the outer limiting sleeve from the bottom hole, the inner side of the first clamping groove is covered in the tenon and the mortise, and the first arm part is stretched out from the opening of the first clamping groove.

2. The screen support of claim 1, wherein, Also includes: Second support assembly;The second support assembly includes: clamping block and second arm part; The outer limiting sleeve is provided with a second clamping groove, and at least one limiting clamping port is provided in the inner side of the second clamping groove; The inner support column is provided with an abutting limiting strip corresponding to the second clamping groove; The clamping block is connected between the limiting clamping port and the abutting limiting strip, and the clamping block is stretched out from the opening of the second clamping groove and connected with the second arm part.

3. The screen support of claim 2, wherein, The inner side of the second clamping groove is provided with a magnetic block corresponding to the limiting clamping port;The clamping block is a magnetic piece; The magnetic block and the clamping block are magnetically adsorbed and connected.

4. The screen support of claim 1, wherein, The first arm part includes: front and back side rotary lever, first horizontal side rotary lever and first connecting seat; One end of the front and back side rotary lever is connected with the tenon, and the other end of the front and back side rotary lever is connected with one end of the first horizontal side rotary lever;The other end of the first horizontal side rotary lever is connected with the first connecting seat.

5. The screen support of claim 2, wherein, The second arm part includes: second horizontal side rotary lever and second connecting seat; One end of the second horizontal side rotary lever is connected with the clamping block, and the other end of the second horizontal side rotary lever is connected with the second connecting seat.

6. The screen support of claim 1, wherein, The base includes: clamping seat, adjusting rod and support plate; One end of the inner support column is arranged on one side of the top plate of the clamping seat;The support plate is arranged on the other side of the top plate; The adjusting rod is movably connected by thread and arranged in the bottom plate of the clamping seat;The end of the adjusting rod close to the top plate is provided with a gasket; When the base is installed on the table plate, the support plate and the gasket are clamped on both sides of the table plate.

7. The screen support of claim 2, wherein, The first support assembly includes four groups;The mortise includes at least four;Each group of the first support assembly is connected with one mortise respectively;Every two groups of the first support assembly are arranged on both sides of the abutting limiting strip respectively.

8. The screen support of claim 7, wherein, The second support assembly includes two groups;The limiting clamping port includes at least two;Each group of the second support assembly is connected with one limiting clamping port respectively.

9. The screen support of claim 1, wherein, The outer limiting sleeve is provided with a top hole on the side away from the bottom hole;The top hole is covered with a detachable cap.

10. The screen support of claim 1, wherein, The base is provided with a limiting insertion hole on the side close to the inner support column;The outer limiting sleeve is provided with a limiting protrusion corresponding to the limiting insertion hole on the side close to the base;The limiting insertion hole and the limiting protrusion are connected.

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