CN220379577U

CN220379577U - LED lamp fixture capable of preventing looseness

Info

Publication number: CN220379577U
Application number: CN202321415621.7U
Authority: CN
Inventors: 夏世朋; 舒江林
Original assignee: Zhuhai Chuangxin Electronics Co ltd
Current assignee: Zhuhai Chuangxin Electronics Co ltd
Priority date: 2023-06-06
Filing date: 2023-06-06
Publication date: 2024-01-23
Anticipated expiration: 2033-06-06

Abstract

The utility model relates to the technical field of LED lamp fixtures, in particular to an anti-loosening LED lamp fixture which comprises a bottom plate body, wherein anti-loosening mechanisms are arranged on the surfaces of the cover plate body and a fixing plate, clamping anti-loosening mechanisms are arranged on the surfaces of a fixing strip and a fixing device, and positioning and placing mechanisms are arranged on the surfaces of the bottom plate body. The utility model not only avoids the phenomenon of deflection of the LED lamp in the using process of the LED lamp clamp, but also ensures the placement accuracy of the LED lamp, avoids the phenomenon that the cover plate body loosens on the surface of the positioning column in the using process of the LED lamp clamp, and simultaneously ensures the integral stability of the LED lamp clamp in use, and ensures the practicability of the LED lamp clamp in use, and the fixing device does not have the phenomenon of looseness in use of the LED lamp clamp.

Description

LED lamp fixture capable of preventing looseness

Technical Field

The utility model relates to the technical field of LED lamp fixtures, in particular to an LED lamp fixture capable of preventing loosening.

Background

The LED light-emitting diode is a solid semiconductor device capable of converting electric energy into visible light, and can directly convert the electric energy into the light, the heart of the LED is a semiconductor wafer, one end of the wafer is attached to a bracket, the other end of the wafer is a negative electrode, the other end of the wafer is connected with the positive electrode of a power supply, the whole wafer is encapsulated by epoxy resin, and an anti-loosening LED lamp clamp is needed during processing of an LED lamp.

Firstly, after an LED lamp is placed in a clamp, in order to avoid deflection of the LED lamp, the LED lamp needs to be positioned and placed, the existing LED lamp clamp cannot position and place the LED lamp when in use, the phenomenon that the LED lamp deflects in the use process of the LED lamp clamp is easy to occur, and meanwhile, the placement accuracy of the LED lamp cannot be guaranteed; secondly, after the cover plate body is buckled, the cover plate body is easy to loosen, the existing LED lamp clamp cannot resist the cover plate body tightly and prevent loosening when in use, the phenomenon that the cover plate body loosens on the surface of the positioning column is easy to occur in the use process of the LED lamp clamp, and meanwhile, the overall stability of the LED lamp clamp in use cannot be guaranteed; thirdly, the LED lamp clamp is required to be provided with a clamping and loosening preventing function for the fixing device when in use, the existing LED lamp clamp can not be used for clamping and loosening preventing the fixing device when in use, so that the phenomenon that the fixing device is easy to loosen when the LED lamp clamp is used can be caused, and the practicability of the LED lamp clamp when in use can not be guaranteed.

Disclosure of Invention

The utility model aims to provide an anti-loosening LED lamp clamp, which solves the problems that in the background art, an LED lamp cannot be positioned and placed when the LED lamp clamp is used, a cover plate body cannot be abutted against and prevented from loosening, and a fixing device cannot be clamped and prevented from loosening.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a can prevent LED lamp anchor clamps of not hard up, includes the bottom plate body, the fixed strip is all installed on the surface of bottom plate body both sides, the surface of fixed strip top position department is provided with fixing device, fixing device and the mutual normal running fit of surface of fixed strip, the top of bottom plate body is provided with the apron body, foam is all installed to the inner wall of apron body, the fixed plate is all installed on the surface of bottom plate body both sides, spacing hole has all been seted up on the surface of bottom plate body, the surface of apron body and fixed plate is provided with anti-loosening mechanism, anti-loosening mechanism comprises rotation double-screw bolt, sticiss spring, tight piece and anticreep board, the fixed strip is provided with the tight anti-loosening mechanism of clamp with fixing device's surface, the tight anti-loosening mechanism of clamp comprises arc fixture block, fixed column, extension spring and holding groove, the surface of bottom plate body all is provided with location and places the mechanism, location is placed the inside of mechanism and is contained flexible spring, removal column and location group.

Preferably, the surface of fixed plate all threaded connection has the fastening double-screw bolt, the one end of fastening double-screw bolt runs through the fixed plate and with the surface screw thread fastening of bottom plate body, the reference column that is used for the location is all installed to the surface of fixed plate top position department, reference column and the mutual sliding fit of apron body, reference column and the mutual joint cooperation of apron body.

Preferably, the surface of the cover plate body is connected with a rotating stud in a threaded manner, the rotating stud is in mutual rotating fit with the surface of the cover plate body, one end of the rotating stud penetrates through the cover plate body and extends to the lower side of the cover plate body, and a compression spring is arranged on the surface of the bottom of the rotating stud.

Preferably, the surface mounting of sticis spring bottom position department has to support tight piece, the surface mounting of support tight piece bottom position department has the anticreep board that is used for the anticreep to the apron body, the surface of anticreep board bottom position department is laminated with the surface of fixed plate mutually.

Preferably, the surface mounting of fixed strip top position department has the fixed column, fixed column and fixing device's surface mutually rotate the cooperation, equidistant holding groove has all been seted up on the surface of fixed column, the inside of holding groove is provided with the arc fixture block.

Preferably, equidistant grooves are formed in the inner walls of the fixing devices, the arc-shaped clamping blocks are matched with the grooves in a clamping mode, extension springs are mounted on the surfaces of the arc-shaped clamping blocks, and one ends of the extension springs are fixed to the inner walls of the containing grooves.

Preferably, the positioning and placing group is arranged on the surface of the bottom plate body, the positioning and placing group is composed of an adjusting block and a fastening bolt, moving columns used for positioning are arranged on the surface of the bottom plate body, the adjusting blocks are arranged on the surfaces of two sides of the moving columns, and the adjusting blocks are in sliding fit with the surface of the bottom plate body.

Preferably, the inner wall of the bottom plate body is provided with a telescopic spring, one end of the telescopic spring is fixed with the surface of the adjusting block, the surface of the adjusting block is connected with a fastening bolt in a threaded manner, and one end of the fastening bolt penetrates through the adjusting block and is fastened with the inner wall of the bottom plate body in a threaded manner.

Compared with the prior art, the utility model has the beneficial effects that: the LED lamp fixture capable of preventing loosening not only avoids the phenomenon that an LED lamp is inclined in the use process of the LED lamp fixture, but also ensures the placement accuracy of the LED lamp, avoids the phenomenon that the surface of the cover plate body on the positioning column is loosened in the use process of the LED lamp fixture, and simultaneously ensures the overall stability of the LED lamp fixture in use, and ensures the practicability of the LED lamp fixture in use, wherein the fixing device does not have the phenomenon of loosening in use of the LED lamp fixture;

1. through being provided with location placement mechanism, the user is according to the size and the specification of LED lamp regulation removal post, at this moment, the user unscrews the fastening bolt on regulating block surface, the removal post is pulled again, drive the removal post and slide to required position department at the surface of bottom plate body under the elasticity effect of extension spring, afterwards, the fastening bolt on regulating block surface is screwed down to the user, install the removal post on the surface of bottom plate body under the effect of fastening bolt, the effect of removal post is placed the LED lamp location, the function of LED lamp anchor clamps to LED lamp location placement has been realized, thereby the phenomenon that the LED lamp skew appears in the LED lamp anchor clamps use, simultaneously, the accuracy of LED lamp placement has been guaranteed;

2. through being provided with anti-loosening mechanism, the user rotates the rotation double-screw bolt again for the rotation double-screw bolt rotates on the surface of apron body, when the rotation double-screw bolt motion, drives under the elasticity effect of sticiss spring and supports tight piece and move to required position department, makes to support tight piece and drive the anti-disengaging plate and move to laminating mutually with the surface of fixed plate, supports tight the apron body at the surface of bottom plate body under the combined action of supporting tight piece and anti-disengaging plate, avoids the apron body to appear not hard up phenomenon, has realized the tight locking function of supporting of LED lamp anchor clamps to the apron body, thereby has avoided the phenomenon that the apron body appears not hard up at the surface of reference column to appear in the use of LED lamp anchor clamps, simultaneously, has guaranteed the overall stability when LED lamp anchor clamps use;

3. through being provided with the tight mechanism of preventing loosening of clamp, fixing device rotates on the surface of fixed column, make fixing device's one end rotate to laminating mutually with the surface of apron body, at this moment, it moves to hold the inside of recess that stretches spring's elasticity effect under, make arc type fixture block to fixing device inner wall, block fixing column and fixing device's surface under the card effect of arc type fixture block and recess, thereby make fixing device fix the surface at the apron body, press from both sides the apron body tightly under fixing device's effect, the follow-up transportation work of being convenient for, the tight locking function of clamp of LED lamp anchor clamps to fixing device has been realized, thereby fixing device can not appear the phenomenon of lax when making the LED lamp anchor clamps use, the practicality of LED lamp anchor clamps when using has been guaranteed.

Drawings

FIG. 1 is a schematic three-dimensional perspective view of the present utility model;

FIG. 2 is a schematic view of a front cross-sectional structure of the present utility model;

FIG. 3 is a schematic top view of the present utility model;

FIG. 4 is a schematic diagram of the engaging state structure of the present utility model;

FIG. 5 is an enlarged cross-sectional view of the cover body of the present utility model;

FIG. 6 is an enlarged schematic view of the anti-loosening mechanism of FIG. 2 according to the present utility model;

FIG. 7 is an enlarged schematic view of the clamping and slackening prevention mechanism of FIG. 3 according to the present utility model;

fig. 8 is an enlarged schematic view of the positioning and placing mechanism in fig. 3 according to the present utility model.

In the figure: 1. a base plate body; 101. a fixing strip; 102. a cover plate body; 103. positioning columns; 104. soaking cotton; 105. a fixing device; 106. a fixing plate; 107. a fastening stud; 108. a limiting hole; 2. an anti-loosening mechanism; 201. rotating the stud; 202. compressing the spring; 203. a tightening block; 204. an anti-drop plate; 3. a clamping anti-loosening mechanism; 301. an arc-shaped clamping block; 302. fixing the column; 303. an extension spring; 304. a holding groove; 4. positioning and placing mechanism; 401. a telescopic spring; 402. a moving column; 403. positioning and placing groups; 4031. an adjusting block; 4032. and (5) fastening a bolt.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and furthermore, the terms "first", "second", "third", "up, down, left, right", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Meanwhile, in the description of the present utility model, unless explicitly stated and defined otherwise, the terms "connected", "connected" and "connected" should be interpreted broadly, and for example, may be fixedly connected, detachably connected, or integrally connected; the mechanical connection and the electrical connection can be adopted; all other embodiments, which may be directly or indirectly through intermediaries, which may be obtained by a person of ordinary skill in the art without inventive effort based on the embodiments of the present utility model are within the scope of the present utility model.

The utility model provides a structure of an LED lamp fixture capable of preventing looseness, as shown in fig. 1 and 2, comprising a bottom plate body 1, wherein fixing strips 101 are arranged on the surfaces of two sides of the bottom plate body 1, fixing devices 105 are arranged on the surfaces of the top positions of the fixing strips 101, the fixing devices 105 are in mutual rotation fit with the surfaces of the fixing strips 101, a cover plate body 102 is arranged above the bottom plate body 1, foam 104 is arranged on the inner wall of the cover plate body 102, fixing plates 106 are arranged on the surfaces of two sides of the bottom plate body 1, fastening studs 107 are connected with the surfaces of the fixing plates 106 in a threaded manner, one ends of the fastening studs 107 penetrate through the fixing plates 106 and are fastened with the surfaces of the bottom plate body 1 in a threaded manner, positioning columns 103 for positioning are arranged on the surfaces of the top positions of the fixing plates 106, the positioning columns 103 are in mutual sliding fit with the cover plate body 102, and the positioning columns 103 are in mutual clamping fit with the cover plate body 102, and limiting holes 108 are formed in the surfaces of the bottom plate body 1.

Further, as shown in fig. 2 and 6, the surface of the cover plate body 102 and the surface of the fixing plate 106 are provided with an anti-loosening mechanism 2, the anti-loosening mechanism 2 is composed of a rotating stud 201, a compressing spring 202, a supporting block 203 and an anti-loosening plate 204, the surface of the cover plate body 102 is connected with the rotating stud 201 in a threaded manner, the rotating stud 201 is in mutual rotating fit with the surface of the cover plate body 102, one end of the rotating stud 201 penetrates through the cover plate body 102 and extends to the lower side of the cover plate body 102, the compressing spring 202 is installed on the surface at the bottom of the rotating stud 201, the supporting block 203 is installed on the surface at the bottom of the compressing spring 202, the anti-loosening plate 204 for preventing the cover plate body 102 is installed on the surface at the bottom of the supporting block 203, and the surface at the bottom of the anti-loosening plate 204 is attached to the surface of the fixing plate 106.

During implementation, a user rotates the rotating stud 201 again, so that the rotating stud 201 rotates on the surface of the cover plate body 102, when the rotating stud 201 moves, the abutting block 203 is driven to move to a required position under the action of the elastic force of the compression spring 202, so that the abutting block 203 drives the anti-falling plate 204 to move to be attached to the surface of the fixed plate 106, the cover plate body 102 is abutted against the surface of the bottom plate body 1 under the combined action of the abutting block 203 and the anti-falling plate 204, the phenomenon that the cover plate body 102 loosens is avoided, and the abutting and anti-loosening functions of the LED lamp fixture on the cover plate body 102 are realized.

Further, as shown in fig. 3 and 7, the surfaces of the fixing strip 101 and the fixing device 105 are provided with a clamping and loosening prevention mechanism 3, the clamping and loosening prevention mechanism 3 is composed of an arc-shaped clamping block 301, a fixing column 302, an extension spring 303 and a containing groove 304, the fixing column 302 is mounted on the surface of the top of the fixing strip 101, the fixing column 302 is in mutual rotation fit with the surface of the fixing device 105, the surface of the fixing column 302 is provided with equidistant containing grooves 304, the inside of the containing grooves 304 is provided with the arc-shaped clamping block 301, the inner wall of the fixing device 105 is provided with equidistant grooves, the arc-shaped clamping block 301 is in mutual clamping fit with the grooves, the surface of the arc-shaped clamping block 301 is provided with the extension spring 303, and one end of the extension spring 303 is fixed with the inner wall of the containing grooves 304.

During implementation, the fixing device 105 rotates on the surface of the fixing column 302, so that one end of the fixing device 105 rotates to be attached to the surface of the cover plate body 102, at this time, the arc-shaped clamping block 301 is driven to move under the action of the elastic force of the extending spring 303 in the accommodating groove 304, so that the arc-shaped clamping block 301 is clamped to the inside of the groove of the inner wall of the fixing device 105, the fixing column 302 and the surface of the fixing device 105 are clamped under the clamping action of the arc-shaped clamping block 301 and the groove, and therefore the fixing device 105 is fixed on the surface of the cover plate body 102, the cover plate body 102 is clamped under the action of the fixing device 105, the follow-up transportation work is facilitated, and the clamping and loosening prevention function of the LED lamp clamp to the fixing device 105 is realized.

Further, as shown in fig. 3 and 8, the surface of the base plate body 1 is provided with a positioning and placing mechanism 4, the interior of the positioning and placing mechanism 4 includes a telescopic spring 401, a moving column 402 and a positioning and placing group 403, the positioning and placing group 403 is arranged on the surface of the base plate body 1, the positioning and placing group 403 is composed of an adjusting block 4031 and a fastening bolt 4032, the surface of the base plate body 1 is provided with a moving column 402 for positioning, the surfaces of two sides of the moving column 402 are provided with the adjusting block 4031, the adjusting block 4031 is in sliding fit with the surface of the base plate body 1, the inner wall of the base plate body 1 is provided with the telescopic spring 401, one end of the telescopic spring 401 is fixed with the surface of the adjusting block 4031, the surface of the adjusting block 4031 is in threaded connection with the fastening bolt 4032, and one end of the fastening bolt 4032 penetrates the adjusting block 4031 and is in threaded fastening with the inner wall of the base plate body 1.

During implementation, a user adjusts the position of the moving column 402 according to the size and specification of the LED lamp, at this time, the user unscrews the fastening bolt 4032 on the surface of the adjusting block 4031, pulls the moving column 402 again, drives the moving column 402 to slide to the required position on the surface of the bottom plate body 1 under the action of the elastic force of the telescopic spring 401, then, the user tightens the fastening bolt 4032 on the surface of the adjusting block 4031, installs the moving column 402 on the surface of the bottom plate body 1 under the action of the fastening bolt 4032, and positions and places the LED lamp under the action of the moving column 402, so as to realize the function of positioning and placing the LED lamp by the LED lamp fixture.

Working principle: when the LED lamp clamp is used, firstly, the base plate body 1 is placed at a designated position, a user places an LED lamp to be clamped on the surface of the base plate body 1, at this time, the user adjusts the position of the moving column 402 according to the size and specification of the LED lamp, at this time, the user unscrews the fastening bolt 4032 on the surface of the adjusting block 4031, pulls the moving column 402 again, drives the moving column 402 to slide to a required position on the surface of the base plate body 1 under the action of the elastic force of the telescopic spring 401, then, the user tightens the fastening bolt 4032 on the surface of the adjusting block 4031, installs the moving column 402 on the surface of the base plate body 1 under the action of the fastening bolt 4032, positions and places the LED lamp under the action of the moving column 402, so that the function of positioning and placing the LED lamp by the LED lamp clamp is realized, the phenomenon of LED lamp deflection in the use process of the LED lamp clamp is avoided, and meanwhile, the accuracy of the placement of the LED lamp is ensured.

Then, the user places apron body 102 on the surface of bottom plate body 1, press apron body 102, make apron body 102 slide on the surface of reference column 103, fix a position apron body 102 under the effect of reference column 103, protect the surface of LED lamp under the effect of fixed plate 106, prevent apron body 102 from pressing the LED lamp, spacing hole 108 is made the fretwork and is in order to let the protection of the metal wire of LED lamp below, afterwards, the user rotates the rotation double-screw bolt 201 again, make the rotation double-screw bolt 201 rotate on the surface of apron body 102, when the rotation double-screw bolt 201 moves, under the elasticity effect of compression spring 202 drive tight piece 203 motion to required position department, make tight piece 203 of support drive anti-disengaging plate 204 to be laminated with the surface of fixed plate 106 mutually, press tight piece 203 and anti-disengaging plate 204's combined action with apron body 102 tightly at the surface of bottom plate body 1, avoid the loose phenomenon to appear in apron body 102, in order to realize the anti-loosening function of LED lamp anchor clamps to the support of apron body 102, thereby the whole stability when LED lamp anchor clamps use the surface of apron body 102 appear at the time of the loose LED anchor clamps, the LED lamp stability has been guaranteed.

Then, the user rotates the fixing device 105 on the surface of the fixing strip 101 again, at this moment, the fixing device 105 rotates on the surface of the fixing column 302, so that one end of the fixing device 105 rotates to be attached to the surface of the cover plate body 102, at this moment, the arc-shaped clamping block 301 is driven to move under the action of the elasticity of the stretching spring 303 in the accommodating groove 304, so that the arc-shaped clamping block 301 is clamped to the inside of the groove in the inner wall of the fixing device 105, the fixing column 302 and the surface of the fixing device 105 are clamped under the clamping action of the arc-shaped clamping block 301 and the groove, so that the fixing device 105 is fixed on the surface of the cover plate body 102, the cover plate body 102 is clamped under the action of the fixing device 105, the follow-up transportation work is facilitated, the clamping and loosening prevention function of the LED lamp clamp to the fixing device 105 is realized, so that the loosening phenomenon of the fixing device 105 does not occur when the LED lamp clamp is used, the practicability of the LED lamp clamp is ensured when the LED lamp clamp is used, and the use work of the LED lamp clamp is finally completed.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a can prevent not hard up LED lamp anchor clamps, includes bottom plate body (1), its characterized in that: the utility model discloses a fixing device for a floor, including bottom plate body (1), fixed strip (101) are all installed on the surface of bottom plate body (1) both sides, the surface of fixed strip (101) top position department is provided with fixing device (105), fixing device (105) and the mutual normal running fit in surface of fixed strip (101), the top of bottom plate body (1) is provided with apron body (102), foam (104) are all installed to the inner wall of apron body (102), fixed plate (106) are all installed on the surface of bottom plate body (1) both sides, spacing hole (108) are all seted up on the surface of bottom plate body (1), the surface of apron body (102) and fixed plate (106) is provided with anti-loosening mechanism (2), anti-loosening mechanism (2) are by rotating double-screw bolt (201), sticiss spring (202), support tight piece (203) and anti-loosening plate (204) constitute, the surface of fixed strip (101) and fixing device (105) is provided with clamp anti-loosening mechanism (3), clamp anti-loosening mechanism (3) are by arc fixture block (301), post (303), spring (304) and extension groove (304) are all installed on the surface of bottom plate body (1), and place the inside (4) and are placed and are contained positioning mechanism (4) and are placed and are contained in place by placing (4) A movable column (402) and a positioning set (403).

2. The looseness-resistant LED lamp fixture of claim 1, wherein: the surface of fixed plate (106) all threaded connection has fastening stud (107), the one end of fastening stud (107) runs through fixed plate (106) and with the surface screw thread fastening of bottom plate body (1), reference column (103) that are used for the location are all installed on the surface of fixed plate (106) top position department, reference column (103) and apron body (102) sliding fit each other, reference column (103) and apron body (102) joint cooperation each other.

3. The looseness-resistant LED lamp fixture of claim 1, wherein: the surface of apron body (102) all threaded connection has rotation double-screw bolt (201), rotation double-screw bolt (201) and the mutual normal running fit in surface of apron body (102), the one end of rotation double-screw bolt (201) runs through apron body (102) and extends to the below of apron body (102), surface mounting in rotation double-screw bolt (201) bottom position department has sticiss spring (202).

4. A looseness-resistant LED lamp fixture as set forth in claim 3, wherein: the surface mounting who sticiss spring (202) bottom position department supports tight piece (203), the surface mounting who supports tight piece (203) bottom position department has anticreep board (204) that are used for the anticreep to apron body (102), the surface of anticreep board (204) bottom position department is laminated with the surface of fixed plate (106).

5. The looseness-resistant LED lamp fixture of claim 1, wherein: the surface mounting of fixed strip (101) top position department has fixed column (302), fixed column (302) and the mutual normal running fit of surface of fixing device (105), equidistant holding groove (304) have all been seted up on the surface of fixed column (302), the inside of holding groove (304) is provided with arc fixture block (301).

6. The looseness-resistant LED lamp fixture of claim 1, wherein: equidistant grooves are formed in the inner walls of the fixing devices (105), the arc-shaped clamping blocks (301) are clamped and matched with the grooves, extension springs (303) are arranged on the surfaces of the arc-shaped clamping blocks (301), and one ends of the extension springs (303) are fixed with the inner walls of the containing grooves (304).

7. The looseness-resistant LED lamp fixture of claim 1, wherein: the locating and placing set (403) is arranged on the surface of the bottom plate body (1), the locating and placing set (403) is composed of an adjusting block (4031) and a fastening bolt (4032), moving columns (402) used for locating are arranged on the surface of the bottom plate body (1), the adjusting block (4031) is arranged on the surfaces of two sides of the moving columns (402), and the adjusting block (4031) is in sliding fit with the surface of the bottom plate body (1).

8. The looseness-resistant LED lamp fixture of claim 1, wherein: the telescopic spring (401) is installed on the inner wall of the bottom plate body (1), one end of the telescopic spring (401) is fixed with the surface of the adjusting block (4031), a fastening bolt (4032) is connected to the surface of the adjusting block (4031) in a threaded mode, and one end of the fastening bolt (4032) penetrates through the adjusting block (4031) and is fastened with the inner wall of the bottom plate body (1) in a threaded mode.