Expansion sleeve

Abstract

The utility model provides an expansion sleeve which comprises a plurality of expansion blocks capable of being encircled to form a barrel-shaped structure, at least one elastic ring arranged on the outer sides of the expansion blocks in a sleeving mode and used for fixing the expansion blocks, and a conical block arranged in an inner cavity of the barrel-shaped structure. The conical block can drive the expansion blocks to expand when moving in the axial direction of the first inner cavity of the cylindrical structure, the number of the expansion blocks is four, the elastic ring is an O-shaped ring, grooves matched with the elastic ring are formed in the outer walls of the expansion blocks, the grooves are formed in the middles of the outer walls of the expansion blocks, the conical block is a conical nut, and the conical nut is connected with the conical block. The conical block comprises a columnar part and a conical part integrally formed with the columnar part, the outer diameter of the conical part is gradually reduced in the direction away from the columnar part, the expansion sleeve is arranged into a plurality of separable and foldable forms, and the expansion sleeve has the advantages of being simple in structure, convenient to machine and low in manufacturing cost, and meanwhile has the advantages of being convenient to disassemble and assemble, high in reliability and the like. And later maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of connection accessories, in particular to an expansion sleeve used for connecting a carbon fiber rod and an annular bracket in the CBCT field. Background Art

[0002] At present, most of the expansion sleeves connecting the CBCT carbon fiber rod and the annular bracket on the market are integrated. For example, the patent application number is 201910911344.0 and the authorization announcement number is CN110513372B. This patent discloses an expansion sleeve for fixed connection. In the scheme disclosed in the above patent, bolts are used to squeeze the support plate outward to achieve the fit and compression between the outer side of the support plate and the borehole wall. The support plate that plays an expansion role in the above patent is an integrated structure. This integrated structure mainly has the following problems: 1. The integrated structure is complex and the processing and manufacturing cost is high; 2. The integrated expansion sleeve structure is difficult to disassemble after installation, which causes great trouble for later maintenance. Therefore, it is necessary to design a separate expansion sleeve to solve the above problems. Utility Model Content

[0003] The utility model provides a separate combined expansion sleeve, which has the advantages of simple structure, convenient processing, low cost, convenient disassembly and assembly, and convenient later maintenance.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The expansion sleeve includes a plurality of expansion blocks that can be combined to form a cylindrical structure, at least one elastic ring that is sleeved on the outside of the plurality of expansion blocks for fixing the expansion blocks, and a conical block arranged in the inner cavity of the cylindrical structure, wherein the conical block can drive the plurality of expansion blocks to expand when it moves axially along the inner cavity of the cylindrical structure.

[0006] Preferably, the number of the expansion blocks is 4.

[0007] Preferably, the elastic ring is an O-ring.

[0008] Preferably, the outer wall of the expansion block is provided with a groove which cooperates with the elastic ring.

[0009] Preferably, the groove is arranged in the middle of the outer wall of the expansion block.

[0010] Preferably, the conical block is a conical nut, and the conical block comprises a columnar portion and a conical portion integrally formed with the columnar portion, and an outer diameter of the conical portion decreases in a direction away from the columnar portion.

[0011] Preferably, a moving portion matched with the columnar portion is provided on an inner wall on one side of the expansion block, and an expansion portion matched with the conical portion is provided on an inner wall on the other side of the expansion block.

[0012] Preferably, the outer diameter of the columnar portion is smaller than the inner diameter of the moving portion.

[0013] Preferably, the inner diameter of the expansion portion is smaller than the outer diameter of the end of the conical portion close to the columnar portion and larger than the outer diameter of the end of the conical portion away from the columnar portion.

[0014] Preferably, the length of the movable portion along the axial direction of the expansion block is greater than the length of the expansion portion along the axial direction of the expansion block.

[0015] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0016] 1. In the utility model, the expansion sleeve includes a plurality of expansion blocks that can be combined to form a complete cylindrical structure, and the plurality of expansion blocks are fixed by an elastic ring. Since the elastic ring has a certain elasticity, the fixing effect on the expansion block is flexible, and the plurality of expansion blocks are movable. When the conical block moves along an axial direction of the inner cavity of the cylindrical structure, the plurality of expansion blocks can be driven to expand, so that the carbon fiber rod is fixed by the expansion and squeezing effect of the expansion block. At the same time, when maintenance and disassembly are required in the later stage, the carbon fiber rod can be put in a loose state by shrinking the expansion block. Therefore, the utility model has the advantages of simple structure, convenient processing and low manufacturing cost by arranging the expansion sleeve into a plurality of detachable and closable forms. At the same time, it has the advantages of convenient disassembly and assembly, and convenient for later maintenance.

[0017] 2. In the utility model, the conical block includes a columnar portion and a conical portion, a moving portion is provided on the inner wall of one side of the expansion block, and an expansion portion is provided on the inner wall of the other side, wherein the moving portion is matched with the columnar portion, and the expansion portion is matched with the conical portion. When in use, when a plurality of expansion blocks are combined to form a cylindrical structure, the conical block can utilize the columnar portion to move in the inner cavity of the moving portion, and when the conical portion is brought into contact with the expansion portion and further moved, the plurality of expansion blocks are driven to expand outward, thereby utilizing the conical surface of the conical portion to drive the inner side of the expansion portion to achieve stable expansion of the expansion portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 2 for Figure 1 A three-dimensional diagram from the other side;

[0020] Figure 3 for Figure 1 Exploded diagram of

[0021] Figure 4 for Figure 2 Exploded diagram of

[0022] Figure 5 It is a structural schematic diagram of the expansion block;

[0023] Figure 6 It is a structural schematic diagram of a conical block;

[0024] Figure 7 This is a usage state diagram of the utility model.

[0025] Explanation of reference numerals: 10, expansion block; 110, moving portion; 120, expansion portion; 20, elastic ring; 30, conical block; 310, columnar portion; 320, conical portion; 40, groove. DETAILED DESCRIPTION

[0026] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0027] To achieve the above purpose, the embodiments of the present invention adopt the following technical solutions: Figure 1 , Figure 2 , an expansion sleeve, comprising an expansion block 10, an elastic ring 20 and a conical block 30, the number of the expansion blocks is multiple, and the multiple expansion blocks can be combined to form a complete cylindrical structure. Specifically in this embodiment, the number of the expansion blocks is four, and the number of the elastic ring 20 is at least one. The elastic ring is arranged on the outer wall of the cylindrical structure formed by the multiple expansion blocks, and is used to fix the multiple expansion blocks from the circumferential direction. The conical block 30 is arranged in the inner cavity of the cylindrical structure. When in use, the conical block is inserted from one end of the cylindrical structure. Since the elastic ring has a certain elasticity, the fixing effect on the expansion block is flexible, that is, the multiple expansion blocks are movable. Therefore, when the conical block moves along an axial direction of the inner cavity of the cylindrical structure, it can drive the multiple expansion blocks to expand, thereby utilizing the expansion and squeezing effect of the expansion block to achieve the fixation of the carbon fiber rod. When maintenance and disassembly are required later, the expansion block can be contracted to make the carbon fiber rod in a loose state. Therefore, the utility model has the advantages of simple structure, convenient processing and low manufacturing cost by arranging the expansion sleeve into multiple detachable and closable forms. At the same time, it has the advantages of convenient disassembly and assembly, and convenient later maintenance.

[0028] Refer to 3. Figure 4 Furthermore, the elastic ring 20 is specifically an O-ring, which has a certain elasticity. In this way, after the multiple expansion blocks are fixed by the O-ring, when the expansion blocks are driven by the conical blocks, the expansion of the multiple expansion blocks can be achieved.

[0029] It should be noted that the number of the elastic rings 20 can be greater than one, such as two, three, etc., so that the fixing effect of the multiple expansion blocks can be improved.

[0030] Furthermore, in order to achieve effective installation of the O-ring and the expansion block, a groove 40 that cooperates with the elastic ring 20 is opened on the outer wall of the expansion block 10. Since each expansion block has a groove on the outer wall, when multiple expansion blocks are combined to form a cylindrical structure, the grooves on the outer walls of the multiple expansion blocks will form an integral annular groove, thereby facilitating the installation and fixation of the elastic ring.

[0031] Furthermore, the groove 40 is arranged in the middle of the outer wall of the expansion block 10, that is, the elastic ring is arranged in the axial middle position of the expansion block, thereby improving the fixing effect of the elastic ring on the expansion block.

[0032] Reference Figure 6 As a preferred technical solution of this embodiment, the conical block 30 is a conical nut. Specifically, the conical block includes a columnar portion 310 and a conical portion 320. The conical portion 320 is integrally formed with the columnar portion, and the outer diameter of the conical portion decreases in the direction away from the columnar portion. In this way, a conical surface is formed on the outside of the conical portion. When in use, the conical block 30 is placed inside a cylindrical structure formed by a plurality of expansion blocks. The conical surface on the outside of the conical portion 320 drives the expansion portion to expand when it contacts the outside of the expansion block.

[0033] Reference Figure 5 Furthermore, in order to enable the conical block 30 to smoothly enter the cylindrical structure formed by the expansion block, a moving portion 110 adapted to the columnar portion 310 is provided on the inner wall of one side of the expansion block 10, so that when multiple expansion blocks are surrounded and formed into one, a through hole will be formed in the inner cavity of the cylindrical structure, and the conical block 30 can move in the above-mentioned through hole; further, in order to facilitate the conical surface of the conical portion 320 to drive the multiple expansion blocks to expand, an expansion portion 120 matched with the conical portion 320 is provided on the inner wall of the other side of the expansion block 10. When the conical block moves to make the conical surface of the conical portion contact with the expansion portion, as external force is further applied to the conical block, the conical surface drives the expansion blocks on its periphery to expand, thereby fixing the carbon fiber rod.

[0034] Furthermore, in order to facilitate the smooth movement of the conical block 30 along the moving part 110 , the outer diameter of the columnar part 310 of this embodiment is smaller than the inner diameter of the moving part 110 . Specifically, the outer diameter of the columnar part 310 can be set to be slightly smaller than the outer diameter of the moving part 110 .

[0035] Correspondingly, in order to realize the driving of the expansion block by the conical portion 320, the inner diameter of the expansion portion 120 is smaller than the outer diameter of the conical portion 320 at one end close to the columnar portion and larger than the outer diameter of the conical portion at one end away from the columnar portion. Since the conical portion includes a large diameter end and a small diameter end, the large diameter end is the end close to the columnar portion, and the small diameter end is the end away from the columnar portion, by setting the inner diameter of the expansion portion 120 to be smaller than the large diameter end of the conical portion and smaller than the small diameter end of the conical portion, the conical surface of the conical portion can be used to drive the inner wall of the expansion portion to realize the expansion of the expansion block.

[0036] Furthermore, the length of the movable part 110 distributed along the axial direction of the expansion block is greater than the length of the expansion part 120 distributed along the axial direction of the expansion block. In this way, the length of the movable part 110 is greater than the length of the expansion part 120, so that the junction between the movable part and the expansion part is staggered with the elastic ring. When the conical block drives the expansion part under the action of external force to expand the expansion block, the expansion of the expansion block can be more convenient and more stable.

[0037] When using, refer to Figure 7 , Figure 7 The expansion sleeve provided in this embodiment is used in the state diagram, in which number 1 is a carbon fiber rod, number 2 is an annular bracket, number 3 is a screw, number 4 is an expansion sleeve, and number 5 is a sealing ring. When in use, multiple expansion blocks are enclosed to form an integral cylindrical structure, and multiple expansion blocks are connected and fixed by using O-rings, and the small diameter end of the tapered block is inserted from the moving part of the expansion sleeve, so that a complete expansion sleeve is assembled. Since multiple expansion blocks are relatively movable, the expansion sleeve is placed in the hole of the annular bracket, and then the carbon fiber rod is installed from the lower end with a screw, wherein the screw and the tapered block in the expansion sleeve cooperate, so that when the tapered block is driven to move, the tapered block drives the expansion part, that is, drives multiple expansion blocks to expand outward, and since the outer side of the carbon fiber rod cooperates with the hole of the annular bracket, the carbon fiber rod is fixed by squeezing the expansion block; when maintenance is required later, the lower end screw is loosened, and then the expansion sleeve will shrink, so that the carbon fiber rod is in a loose state, and the carbon fiber rod can be conveniently taken out, so it has the advantage of easy maintenance.

[0038] The above-described embodiments are merely descriptions of preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An expansion sleeve, characterized in that: The invention comprises a plurality of expansion blocks (10) which can be combined to form a cylindrical structure, at least one elastic ring (20) which is sleeved on the outside of the plurality of expansion blocks and used to fix the expansion blocks, and a conical block (30) which is arranged in the inner cavity of the cylindrical structure, wherein the conical block can drive the plurality of expansion blocks to expand when it moves axially along the inner cavity of the cylindrical structure.

2. The expansion sleeve according to claim 1, characterized in that: The number of the expansion blocks (10) is 4.

3. The expansion sleeve according to claim 1, characterized in that: The elastic ring (20) is an O-ring.

4. The expansion sleeve according to claim 3, characterized in that The outer wall of the expansion block (10) is provided with a groove (40) that cooperates with the elastic ring (20).

5. The expansion sleeve according to claim 4, characterized in that: The groove (40) is arranged in the middle of the outer wall of the expansion block (10).

6. The expansion sleeve according to claim 1, characterized in that: The conical block (30) is a conical nut, comprising a columnar portion (310) and a conical portion (320) integrally formed with the columnar portion, wherein the outer diameter of the conical portion decreases in a direction away from the columnar portion.

7. The expansion sleeve according to claim 6, characterized in that A moving portion (110) adapted to the columnar portion (310) is provided on one inner wall of the expansion block (10), and an expansion portion (120) adapted to the conical portion (320) is provided on the other inner wall of the expansion block (10).

8. The expansion sleeve according to claim 7, characterized in that The outer diameter of the columnar portion (310) is smaller than the inner diameter of the moving portion (110).

9. The expansion sleeve according to claim 7, characterized in that: The inner diameter of the expansion portion (120) is smaller than the outer diameter of the end of the conical portion (320) close to the columnar portion and larger than the outer diameter of the end of the conical portion away from the columnar portion.

10. The expansion sleeve according to claim 7, characterized in that: The length of the moving part (110) distributed along the axial direction of the expansion block is greater than the length of the expansion part (120) distributed along the axial direction of the expansion block.

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