CN215563104U

CN215563104U - Fastening device

Info

Publication number: CN215563104U
Application number: CN202121727614.1U
Authority: CN
Inventors: 陈贵忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-01-18
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a fastening device, which comprises a fastening piece and a mounting piece, wherein a first inner sleeve body is sleeved in the mounting piece, a tooth structure is arranged on the outer side wall of the first inner sleeve body, a rotating gear meshed with the tooth structure is rotatably mounted in the mounting piece, an operating window is formed in the mounting piece, a second inner sleeve body is embedded in the first inner sleeve body, a screwing piece matched with the fastening piece is arranged on the second inner sleeve body in a screwing mode, the screwing piece is movably mounted in the second inner sleeve body in a mode of translating towards the outside of the second inner sleeve body along with the extension of the fastening piece, a pushing structure is arranged in the first inner sleeve body, and an elastic piece tensioned between the first inner sleeve body and the second inner sleeve body is mounted in the first inner sleeve body. Compared with the prior art, the close fit of the screw-joint block and the fastening piece and the screw-joint of the screw-joint block and the fastening piece are very firm in installation, and the installation can be realized only by pushing the fastening main body, so that the quick installation, the safety, the simplicity and the convenience are realized, the exposure to the outside is avoided, and the use is humanized.

Description

Fastening device

Technical Field

The utility model relates to the field of installation and fixation, in particular to a fastening device.

Background

As is known, most of the existing main bodies are fastened by fasteners, the fastening mode generally adopts mounting screws which are easy to mount, the mounting screws are most easily and directly penetrated through the two main bodies and are matched with nuts to be locked together, the screws and the nuts are exposed to the outside and are not attractive, then locking parts matched with the mounting screws are embedded in a wall body, then the screws extend into the locking parts and are locked by external tools, and the embedded mounting mode can hide the screws and is attractive in mounting. The locking part structurally comprises an outer sleeve body, a screw rod and a screw, wherein the screw rod and the screw are sleeved in the outer sleeve body, a positioning recess is concavely arranged on the outer side wall of one end of the screw rod, the screw is arranged in the outer sleeve body and is vertical to the screw rod, the end part of the free end of the screw is matched with the positioning recess, and an extension hole for the screw to extend into is arranged on the outer sleeve body; during the installation, the outer cover is installed on being in the body outside the wall, the screw rod is horizontal setting, and the one end of screw rod is pre-buried in the wall, the screw rod has the sunken one end of location outside being in the wall, directly has the one side of outer cover towards the screw rod translation with the body during the equipment, it is internal that the screw rod stretches into the overcoat, the screw stretches into the overcoat from top to bottom internally, and the free end tip of screw is towards the location sunken, adopt external instrument locking screw to make the screw move down the top tightly in the location sunken this moment, realize the installation fastening function.

However, in the locking structure, the screw and the screw are tightly pressed, so that the installation is unstable, and the screw is easy to be separated from the screw without being locked in the installation process, so that the installation is unsafe.

In view of the above, the present inventors have conducted extensive studies to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fastening device which is stable in installation, convenient to assemble, safe to install and quick to install.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a fastening device comprises a fastening piece, wherein the fastening piece is a screw and further comprises a mounting piece, the mounting piece is of a hollow structure, a sealing cover is detachably mounted at a first end of the mounting piece, a mounting structure capable of being mounted on a fastening main body is arranged at a second end of the mounting piece, an extending channel communicated with a hollow cavity of the mounting piece and used for the fastening piece to extend into is arranged in the mounting structure, a first inner sleeve body is sleeved in the mounting piece, a tooth structure is arranged on the outer side wall of the first inner sleeve body, a rotating gear meshed with the tooth structure is rotatably mounted in the mounting piece, an operating window used for an external tool to operate the rotating gear to rotate is formed in the mounting piece, a second inner sleeve body used for the fastening piece to extend into and translate in the first inner sleeve body is embedded in the first inner sleeve body, and a straight line where the first inner sleeve body is located longitudinally, The straight line of the longitudinal position of the second inner sleeve body and the straight line of the longitudinal position of the mounting part are arranged in parallel, a screwing piece in screwing fit with the fastening piece is arranged on the second inner sleeve body, the screwing piece is movably mounted in the second inner sleeve body in a mode of translating towards the outside of the second inner sleeve body along with the extension of the fastening piece, a pushing structure which pushes the screwing piece to translate towards the inside of the second inner sleeve body and is closely matched with the fastening piece along with the translation of the screwing piece towards the direction of the mounting structure is arranged in the first inner sleeve body, and an elastic piece tensioned between the first inner sleeve body and the second inner sleeve body is mounted in the first inner sleeve body.

The mounting part is a cylindrical sleeve body which is horizontally arranged, the first end face of the cylindrical sleeve body is open, the second end face of the cylindrical sleeve body extends to form a threaded sleeve with external threads, the threaded sleeve is communicated with the cylindrical sleeve body, the fastening piece is sleeved in the threaded sleeve, a mounting sleeve which can be fixedly mounted on a fastening body is installed outside the threaded sleeve, and the threaded sleeve and the mounting sleeve form the mounting structure.

The sealing cover is a cover plate, an embedded ring is integrally formed on one surface of the sealing cover, and the first end of the first inner sleeve body is embedded and tightly fastened in the embedded ring.

The outer side wall of the cylindrical sleeve body extends outwards to form a hollow upright column which is perpendicular to the cylindrical sleeve body, two ends of the hollow upright column are open, the hollow upright column is communicated with the cylindrical sleeve body, the rotating gear is embedded in the hollow upright column, a pressing cover for limiting the rotating gear is tightly sleeved outside the end part of the hollow upright column, which is back to the cylindrical sleeve body, the end part of the first end of the rotating gear extends into the cylindrical sleeve body, first conical teeth are densely distributed on the outer side wall of the end part of the first end of the rotating gear, an operation hole for driving the rotating gear to rotate is concavely arranged on the end surface of the second end of the rotating gear, an exposed window for the operation hole is arranged on the pressing cover, and the window and the operation hole form the operation window.

The second end part of the first inner sleeve body is provided with an expanding ring which is overlapped on the inner end surface of the second end of the cylindrical sleeve body, the expanding ring is positioned outside one side of the rotating gear, one surface of the expanding ring facing the rotating gear is densely provided with second conical teeth which are meshed with the first conical teeth, and the expanding ring and the second conical teeth form the tooth structure.

The outer side wall of the second inner sleeve body is convexly provided with a strip-shaped convex strip extending along the axial direction of the second inner sleeve body, and the inner side wall of the first inner sleeve body is concavely provided with a guide groove for the strip-shaped convex strip to slide into the inner holding part and move in the guide groove.

The second inner sleeve body is in a conical column structure which is gradually reduced from the first end to the second end, the cavity of the second inner sleeve body is correspondingly in a conical column structure, the outer side wall of the second end of the second inner sleeve body is provided with a pair of strip-shaped holes which are symmetrically arranged and extend along the axial direction of the second inner sleeve body, each strip-shaped hole is embedded with a screw tooth block, one surface of the screw tooth block facing the cavity of the second inner sleeve body is provided with inner screw teeth which are screwed with the fastening piece, the side of the screw tooth block back to the cavity of the second inner sleeve body extends out of the strip-shaped hole, the two screw tooth blocks form the screw part, the inner side wall of the first inner sleeve body is concavely provided with a gradual change groove for clamping the part of the screw tooth block outside the strip-shaped hole, the groove depth of the gradual change groove is gradually reduced from the first end of the first inner sleeve body to the second end and is close to O, and the gradual change groove is of the pushing structure.

The elastic member is a spring.

After the technical scheme is adopted, the whole installation part is installed in the locking main body through the installation structure during assembly, the locking main body is provided with the through holes respectively communicated with the exposed window and the extending channel, the extending channel is arranged outwards, the fastening piece is embedded in the wall body or the other locking main body in advance, and one end of the fastening piece extends out of the wall body or the other locking main body. When the fastener is installed, the locking main body with the installation part is directly pushed towards the direction of the fastener, one end of the fastener extends into the extending channel through the through opening, penetrates into the extending channel and extends into the second inner sleeve body, the elastic element is compressed along with the translation of the fastener extending into the second inner sleeve body, the screwing element translates towards the outside of the second inner sleeve body, the fastener can easily extend out of the second inner sleeve body, when the extending length of the fastener is in place, the elastic element resets, the second inner sleeve body resets and translates, the second inner sleeve body translates towards the direction of the installation structure, the resetting of the second inner sleeve body enables the screwing element to be pressed into the second inner sleeve body under the limitation of the pushing structure, the screwing element is tightly matched with the fastener, at the moment, the fastener is tightly matched with the screwing element, the fastener cannot be extracted from the installation part, therefore, the fastener cannot be directly separated from the installation part due to the tight fit of the fastener and the screwing element no matter whether the fastener is in place or not in the installation process, the installation is very safe, and finally, external instrument stretches into in the exposed window through the interface and controls the running gear rotation, running gear drives first inside and outside cover and rotates, the corresponding second inside and outside cover body and the spiro union piece together rotate, make the spiro union piece and the inseparable spiro union of fastener be in the same place, thereby make the suitability of installed part and fastener more firm, and during the installation, only need push the fastening main part, can make fastener and installed part fixed coordination, the installation is simple and easy, and convenient, realize the fast-assembling effect, whole structure is simple and easy, and hide in the fastening main part, can not expose outside, thereby can not influence the outward appearance of fastening main part, it is humanized to use.

Drawings

FIG. 1 is a schematic view of the present invention with the fastener omitted;

FIG. 2 is a cutaway view of the present invention;

FIG. 3 is a sectional view of the first inner sheath body according to the present invention;

FIG. 4 is a perspective view of the second inner sheath body of the present invention.

Detailed Description

In order to further explain the technical scheme of the utility model, the following detailed description is combined with the accompanying drawings.

The fastening device comprises a fastening piece 1 and a mounting piece 2, wherein the fastening piece 1 is a screw, the mounting piece 2 is of a hollow structure, a sealing cover 3 is detachably mounted at the first end of the mounting piece 2, a mounting structure capable of being mounted on a fastening main body is arranged at the second end of the mounting piece 2, and an extension passage communicated with the hollow cavity of the mounting piece and used for the fastening piece to extend into is arranged in the mounting structure; preferably, the mounting member 2 is a cylinder sleeve horizontally arranged, the horizontal direction of the cylinder sleeve is taken as the left-right direction, the first end face (i.e. the left end face) of the cylinder sleeve is open, the second end face (i.e. the right end face) of the cylinder sleeve extends to form a threaded sleeve 21 with external threads, the threaded sleeve 21 is communicated with the cylinder sleeve, the fastening member 1 is sleeved in the threaded sleeve 21, the external threads of the threaded sleeve 21 are provided with a mounting sleeve 22 capable of being fixedly mounted on the fastening body, and the threaded sleeve and the mounting sleeve form the mounting structure, the cavity of the thread bush 1 is the stretching-in channel, the sealing cover 3 is a cover plate, one surface (namely the right side surface) of the sealing cover 3 is integrally formed with an embedded ring 31 embedded into the first end port of the cylindrical sleeve body, and the sealing cover 3 can be detached by utilizing the sleeved tight installation of the sealing cover 3, so that the assembly and disassembly of the internal components of the installation part 2 are facilitated. When in installation, the fastener 1 is horizontally installed on a wall body or a fastening main body, and the installation sleeve 22 is pre-embedded and fixed in the fastening main body.

The installation part 2 is internally sleeved with a first inner sleeve body 4, a straight line where the first inner sleeve body 4 is longitudinally located is parallel to a straight line where the installation part 2 is longitudinally located, namely the first inner sleeve body 4 is horizontally arranged from left to right, the first inner sleeve body 4 is of a hollow cylindrical structure with two open ends, the outer side wall of the first inner sleeve body 4 is provided with a tooth structure, a rotating gear 5 meshed with the tooth structure is rotatably installed in the installation part 2, the installation part 2 is provided with an operation window for external tools to operate the rotating gear to rotate, preferably, a hollow upright column 22 vertically arranged with the cylindrical sleeve body extends outwards on the outer side wall of the cylindrical sleeve body, two ends of the hollow upright column 2 are open, the hollow upright column 22 is communicated with the cylindrical sleeve body, namely, the hollow upright column 22 is vertically arranged on the top surface of the cylindrical sleeve body, and a compression cover 23 is tightly sleeved outside the end part (namely the upper end part) of the hollow column 22, which faces away from one end part of the cylindrical sleeve body, the pressing sleeve 23 can be tightly fitted with the hollow upright column 22 in a sleeved manner or screwed with the hollow upright column, the rotating gear 5 is embedded in the hollow upright column 22, the first end part (namely the lower end part) of the rotating gear 5 extends into the cylindrical sleeve body, first bevel teeth are densely distributed on the outer side wall of the first end part of the rotating gear 5, an operation hole 51 for external tools to extend into the cylinder to drive the rotating gear to rotate is arranged on the second end surface of the rotating gear 5, the operation hole 51 is an inner hexagonal or inner octagonal hole, a window for exposing the operation hole is formed in the pressing cover 23, the size of the window is smaller than the outer diameter of the second end surface of the rotating gear 5, and the window and the operation hole form the operation window; the pressing cover 23 is used for realizing the quick disassembly and assembly and replacement of the rotating gear.

The second end part of the first inner sleeve body 4 is provided with an expanding ring 41 which is overlapped on the inner end surface of the second end of the cylindrical sleeve, one surface of the expanding ring 41 facing the rotating gear 5 is provided with second conical teeth which are meshed with the first conical teeth, the rotating gear 5 can drive the first inner sleeve body 4 to rotate by utilizing the meshing of the first conical teeth and the second conical teeth, and the second conical teeth and the expanding ring form the tooth structure.

A second inner sleeve body 6 for the fastening piece 1 to extend into and translate in the first inner sleeve body is embedded in the first inner sleeve body 4, a screwing piece 7 in screwing fit with the fastening piece 1 is arranged on the second inner sleeve body 6, the screwing piece 7 is movably arranged on the second inner sleeve body 6 in a mode of translating towards the outside of the second inner sleeve body 6 along with the extension of the fastening piece, and a pushing structure which translates towards the inside of the second inner sleeve body along with the translation of the screwing piece 7 towards the direction of the mounting structure and pushes the screwing piece to translate towards the inside of the second inner sleeve body is arranged in the first inner sleeve body 4; preferably, the second inner sleeve 6 is a hollow conical cylinder structure gradually reducing from the first end to the second end, i.e. a conical cylinder structure gradually reducing from left to right, the cavity of the second inner sleeve 6 is a conical cylinder structure correspondingly, a pair of strip holes 61 symmetrically arranged and extending along the axial direction of the second inner sleeve are arranged on the outer side wall of the second end (i.e. the outer side wall of the right end) of the second inner sleeve 6, each strip hole 61 is a square hole extending along the left-right direction, a screw block is embedded in each strip hole, the screw block is a square block, inner screws screwed with the fastening piece 1 are arranged on one surface of the screw block facing the cavity of the second inner sleeve, one surface of the screw block facing away from the cavity of the second inner sleeve extends out of the strip hole, the two screw blocks form the screw assembly 7, a gradual-changing groove 42 for clamping the part of the screw block outside the strip hole is concavely arranged on the inner side wall of the first inner sleeve 4, the groove depth of the gradual change groove is gradually reduced from the first end of the first inner sleeve body to the second end and is close to O, the gradual change groove is of the pushing structure, namely, the groove depth of the gradual change groove 42 is gradually reduced from the left end to the right end until the groove depth is close to 0, the right end inner side wall of the gradual change groove right end part and the first inner sleeve body 4 is in smooth transition, the two screwing parts 7 are clamped between the gradual change groove right end part and the second inner sleeve body, namely, the distance between the bottoms of the two gradual change groove right end part grooves is matched with the maximum outer diameter of the first inner sleeve body when the two screwing parts are screwed with the fastening piece 1, and the distance between the bottoms of the two gradual change groove left end grooves is larger than the maximum outer diameter of the first inner sleeve body at the two screwing parts.

The first inner sleeve body 4 is in an open shape corresponding to the seal cover 3, the elastic member 8 tensioned between the seal cover and the second inner sleeve body is installed in the first inner sleeve body 4, preferably, the first inner sleeve body 4 is in a cylindrical structure with two open ends, the first end of the first inner sleeve body 4 is tightly embedded in the embedded ring 31, so that the first inner sleeve body 4, the installation part and the seal cover 3 are installed tightly, the elastic member 8 is a spring, and the spring is located in the left end of the first inner sleeve body 4 and tensioned between the inner surface of the seal cover 3 and the left end face of the second inner sleeve body 6.

The utility model discloses a fastening device which can be applied to a wall-mounted closestool, and the specific assembly mode is that an installation piece 2 is embedded in the upper part of the rear side wall of the closestool, one end of the installation piece, which is far away from a spring, faces the outside of the closestool, an installation sleeve 22 extends into the rear side wall of the closestool and is screwed with a thread sleeve 21 of the installation piece 2, so that the whole installation piece 2 is positioned in the closestool, a hollow upright column 22 is arranged upwards, the top surface of the closestool is provided with a through hole communicated with an exposed window, a fastening piece 1 is horizontally embedded in a wall body, and one end of the fastening piece extends out of the wall body. When the closestool is installed, the closestool with the installation part 2 is directly pushed towards the direction of the fastener 1, one end of the fastener 1 extends into the threaded sleeve through the through opening, penetrates through the threaded sleeve and enters the second inner sleeve body 6, the second inner sleeve body 6 is pushed to translate towards the spring direction along with the extension of the fastener 1, the spring is compressed, the two screwing parts 7 cannot be extruded by the gradual change groove due to the translation of the second inner sleeve body 6, the screwing parts 7 are pushed to translate back and forth due to the pushing of the outer arm of the fastener 1, the operation that the fastener 1 extends into the second inner sleeve body 6 is smoother and easier, the screwing parts 7 move to the wider area of the gradual change groove, when the length of the fastener 7 is in place, the pushing of the closestool is stopped, the spring is released, the elastic reset is carried out, the spring pushes the second inner sleeve body 6 to reset and translate towards the direction of the threaded sleeve 21, the reset translation of the second inner sleeve body 6 enables the two screwing parts 7 to correspondingly translate towards the narrower area of the gradual change groove, two screwing blocks 7 are clamped between the first inner sleeve body and the locking piece 1, namely the screwing piece 7 is tightly matched with the fastening piece 1, at the moment, an external tool (such as a wrench) extends into the operation hole 51 through the opening to control the rotation gear 5 to rotate, the rotation gear 5 drives the first inner sleeve 4 to rotate, the corresponding second inner sleeve body 6 and the screwing piece 7 rotate together, and the screwing piece 7 and the fastening piece 1 are tightly screwed together. Compared with the prior art, the novel fastener structure only needs to push the mounting piece to the fastener during installation, the fastener only needs to stop pushing after extending into the second internal sleeve piece to enable the two screwing blocks to clamp the fastener by utilizing the restoring force of the spring, thus, when being installed, an installer can install and stop the fastener only after the fastener passes through the two screw blocks, the fastener can not fall off from the installation piece, the installation is very safe, the installation is convenient for workers, the fixed installation of the installation piece and the fastening piece can be realized by clamping the fastening piece by the two screw blocks, the screwing relationship between the screw blocks and the fastening piece is matched, the installation firmness is further enhanced, and when in installation, the utility model can be pushed in, thereby realizing the fast installation mode, being simple and convenient in installation and simple in the whole structure, the fastening body is hidden in the fastening body and cannot be exposed outside, so that the appearance of the fastening body cannot be influenced, and the use is humanized; when the fastener extends into the second inner sleeve body 6, the second inner sleeve body can translate to change the distance between the two screwing blocks 7, so that the fastener can extend more easily and smoothly, and the screwing blocks can be tightly matched with the fastener all the time after the fastener extends into the second inner sleeve body and is installed by utilizing the structural limitation of the gradually-changed groove; finally, the sealing cover and the pressing cover are arranged to facilitate assembly and replacement of all parts in the mounting part.

This is novel, it is excellent, the first end lateral wall epirelief of the second inner sleeve body 6 is equipped with the bar sand grip 62 that extends along the axial direction of the second inner sleeve body 6, the concave guide groove 43 that supplies this bar sand grip to slide in content and the translation in it that is equipped with on the inside wall of the first inner sleeve body 4, the number of bar sand grip 62 can be many, each bar sand grip 62 encircles the distribution along circumference interval, the guide groove 43 is corresponding to set up a plurality of, can play the guide effect to the slip translation of the second inner sleeve body 6 through the cooperation of guide groove 43 and bar sand grip 62, in order to guarantee the spiral shell close with the spiral shell of fastener.

The product form of the present invention is not limited to the embodiments and examples shown in the present application, and any suitable changes or modifications of the similar ideas should be made without departing from the patent scope of the present invention.

Claims

1. A fastening device comprises a fastening piece which is a screw, and is characterized in that: the mounting part is of a hollow structure, a sealing cover is detachably mounted at the first end of the mounting part, a mounting structure capable of being mounted on a fastening main body is arranged at the second end of the mounting part, an extending channel communicated with the hollow cavity of the mounting part and used for the fastener to extend into is arranged in the mounting structure, a first inner sleeve body is sleeved in the mounting part, a tooth structure is arranged on the outer side wall of the first inner sleeve body, a rotating gear meshed with the tooth structure is rotatably mounted in the mounting part, an operating window used for an external tool to operate the rotating gear to rotate is formed in the mounting part, a second inner sleeve body used for the fastener to extend into and translate in the first inner sleeve body is embedded in the first inner sleeve body, the straight line where the first inner sleeve body is located in the longitudinal direction, the straight line where the second inner sleeve body is located in the longitudinal direction and the straight line where the mounting part is located in the longitudinal direction are arranged in parallel, the second inner sleeve body is provided with a screw part in screw fit with the fastening piece, the screw part is movably arranged in the second inner sleeve body in a mode of translating towards the outside of the second inner sleeve body along with the extension of the fastening piece, the first inner sleeve body is internally provided with a pushing structure which pushes the screw part to translate towards the inside of the second inner sleeve body and is closely matched with the fastening piece along with the translation of the screw part towards the direction of the mounting structure, and the first inner sleeve body is internally provided with an elastic piece tensioned between the first inner sleeve body and the second inner sleeve body.

2. A fastening device according to claim 1, wherein: the mounting part is a cylindrical sleeve body which is horizontally arranged, the first end face of the cylindrical sleeve body is open, the second end face of the cylindrical sleeve body extends to form a threaded sleeve with external threads, the threaded sleeve is communicated with the cylindrical sleeve body, the fastening piece is sleeved in the threaded sleeve, a mounting sleeve which can be fixedly mounted on a fastening body is installed outside the threaded sleeve, and the threaded sleeve and the mounting sleeve form the mounting structure.

3. A fastening device according to claim 2, wherein: the sealing cover is a cover plate, an embedded ring is integrally formed on one surface of the sealing cover, and the first end of the first inner sleeve body is embedded and tightly fastened in the embedded ring.

4. A fastening device according to claim 2, wherein: the outer side wall of the cylindrical sleeve body extends outwards to form a hollow upright column which is perpendicular to the cylindrical sleeve body, two ends of the hollow upright column are open, the hollow upright column is communicated with the cylindrical sleeve body, the rotating gear is embedded in the hollow upright column, a pressing cover for limiting the rotating gear is tightly sleeved outside the end part of the hollow upright column, which is back to the cylindrical sleeve body, the end part of the first end of the rotating gear extends into the cylindrical sleeve body, first conical teeth are densely distributed on the outer side wall of the end part of the first end of the rotating gear, an operation hole for driving the rotating gear to rotate is concavely arranged on the end surface of the second end of the rotating gear, an exposed window for the operation hole is arranged on the pressing cover, and the window and the operation hole form the operation window.

5. A fastening device according to claim 4, wherein: the second end part of the first inner sleeve body is provided with an expanding ring which is overlapped on the inner end surface of the second end of the cylindrical sleeve body, the expanding ring is positioned outside one side of the rotating gear, one surface of the expanding ring facing the rotating gear is densely provided with second conical teeth which are meshed with the first conical teeth, and the expanding ring and the second conical teeth form the tooth structure.

6. A fastening device according to claim 2, wherein: the outer side wall of the second inner sleeve body is convexly provided with a strip-shaped convex strip extending along the axial direction of the second inner sleeve body, and the inner side wall of the first inner sleeve body is concavely provided with a guide groove for the strip-shaped convex strip to slide into the inner holding part and move in the guide groove.

7. A fastening device according to claim 2, wherein: the second inner sleeve body is in a conical column structure which is gradually reduced from the first end to the second end, the cavity of the second inner sleeve body is correspondingly in a conical column structure, the outer side wall of the second end of the second inner sleeve body is provided with a pair of strip-shaped holes which are symmetrically arranged and extend along the axial direction of the second inner sleeve body, each strip-shaped hole is embedded with a screw tooth block, one surface of the screw tooth block facing the cavity of the second inner sleeve body is provided with inner screw teeth which are screwed with the fastening piece, the side of the screw tooth block back to the cavity of the second inner sleeve body extends out of the strip-shaped hole, the two screw tooth blocks form the screw part, the inner side wall of the first inner sleeve body is concavely provided with a gradual change groove for clamping the part of the screw tooth block outside the strip-shaped hole, the groove depth of the gradual change groove is gradually reduced from the first end of the first inner sleeve body to the second end and is close to O, and the gradual change groove is of the pushing structure.

8. A fastening device according to claim 2, wherein: the elastic member is a spring.