CN212124724U

CN212124724U - Circular holding column structure for holding column pair combination

Info

Publication number: CN212124724U
Application number: CN202020725515.9U
Authority: CN
Inventors: 王家闻; 钱炜
Original assignee: Anhui Xueji Ancient Garden Co ltd
Current assignee: Anhui Xueji Ancient Garden Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-12-11
Anticipated expiration: 2030-04-30

Abstract

The utility model relates to a circular pillar structure is used to uniting of embracing post, including hollow cylinder, the hollow cylinder outside is equipped with first arc plate body and second arc plate body, first arc plate body is equipped with a plurality ofly, the inboard arc surface of first arc plate body and the inboard arc surface of second arc plate body all laminate with hollow cylinder's outside arc surface, second arc plate body splices into hollow cylinder structure with a plurality of first arc plate bodies in proper order. The utility model discloses when pasting antithetical couplet, through setting up a plurality of first arc plate bodies and a second arc plate body, form a hollow cylinder structure by a plurality of first arc plate bodies and a second arc plate body jointly to this will put up the cylindric structure surface subdivision of antithetical couplet and become the tiny arc of multistage, thereby be convenient for people will paste the antithetical couplet neatly, be favorable to improving the sight of antithetical couplet.

Description

Circular holding column structure for holding column pair combination

Technical Field

The utility model belongs to the technical field of the thick pillar technique and specifically relates to a thick pillar is to circular thick pillar structure of antithetical couplet.

Background

Couplet is one of the traditional culture of China, also called couplet of pillar or pair, and is a dual sentence written on paper, cloth or engraved on bamboo, wood, or column. In the traditional technology, people usually paste the couplet on a cylindrical or square holding column for others to watch.

Among the prior art, people are pasting antithetical couplet, and direct antithetical couplet is pasted on cylindrical enclasping post usually, because of antithetical couplet length is great, when people will paste antithetical couplet on cylindrical enclasping post, it is neat to be difficult to paste antithetical couplet usually to make the sight of antithetical couplet suffer the influence.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a circular pillar structure of embracing post pair ally oneself with, this circular pillar structure is spliced into circular pillar by a plurality of arc plate bodies through setting up the less arc plate body of a plurality of widths to this is convenient for people will be neatly pasted to antithetical couplet, thereby makes the sight of antithetical couplet improve.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a circular column embracing structure is used to antithetical couplet to column, includes hollow cylinder, the hollow cylinder outside is equipped with first arc plate body and second arc plate body, first arc plate body is equipped with a plurality ofly, the inboard arc surface of first arc plate body and the inboard arc surface of second arc plate body all laminate with hollow cylinder's outside arc surface, second arc plate body splices into hollow cylinder structure with a plurality of first arc plate body in proper order.

Through adopting above-mentioned technical scheme, when pasting antithetical couplet, through setting up a plurality of first arc plate bodies and a second arc plate body, form a hollow cylinder structure by a plurality of first arc plate bodies and a second arc plate body jointly to this will paste the cylindric structure surface of antithetical couplet and subdivide into the tiny arc of multistage, thereby be convenient for people will paste the antithetical couplet neatly, be favorable to improving the sight of antithetical couplet.

The utility model discloses further set up to: every all be fixed with first concatenation strip on the lateral wall of first arc plate body one of them side, every all seted up on the lateral wall of first arc plate body opposite side with first concatenation strip grafting complex splice groove, be fixed with on the lateral wall of second arc plate body one of them side with splice groove grafting complex second concatenation strip, set up the breach that is used for holding first concatenation strip on the lateral wall of second arc plate body opposite side is close to its outside arc surface's the position, install jointly on breach and the first concatenation strip that is close to breach department and be used for carrying out the fixed subassembly that fixes second arc plate body and the first arc plate body that the breach is adjacent.

By adopting the technical scheme, when the second arc-shaped plate body and the plurality of first arc-shaped plate bodies are spliced together to form the hollow cylindrical structure, a worker only needs to laminate the inner side arc-shaped surface of the second arc-shaped plate body with the outer side arc-shaped surface of the hollow cylinder, meanwhile, the worker needs to splice the splicing groove of one first arc-shaped plate body with the second splicing strip, then, the worker needs to splice the rest first arc-shaped plate bodies in sequence until the first splicing strip on the first arc-shaped plate body adjacent to the notch is inserted into the notch, at the moment, the worker only needs to adopt the fixing component to fix the second arc-shaped plate body and the first arc-shaped plate body adjacent to the notch, and therefore the installation work of the hollow cylindrical structure is completed; only adopt simple mosaic structure between second arc plate body and a plurality of first arc plate body, do not adopt glue bonding, fully embodied the green theory.

The utility model discloses further set up to: the lateral wall that splice groove one side was kept away from to first concatenation strip is equipped with first chamfer with the arc surface crossing department of first concatenation strip, the lateral wall that breach one side was kept away from to second concatenation strip is equipped with the second chamfer with the arc surface crossing department of second concatenation strip.

By adopting the technical scheme, the first chamfer angle is arranged, so that the first splicing strip and the splicing groove can be aligned by a worker conveniently, and the adjacent first arc-shaped plate bodies can be spliced by the worker conveniently; through setting up the second chamfer, reduced the staff and spliced the degree of difficulty that the strip was spliced with the splice groove with the second to this staff splices the strip with the splice groove, thereby the staff of being convenient for splices second arc plate body and first arc plate body.

The utility model discloses further set up to: the fixed assembly comprises a cover body hinged to the position, close to the outer arc-shaped surface of the second arc-shaped plate body, of the notch, a first magnetic block embedded on the side wall, close to one side of the hollow cylinder, of the cover body, and a second magnet embedded on the side wall, far away from one side of the hollow cylinder, of the first splicing strip, the inner arc-shaped surface of the cover body is attached to the outer arc-shaped surface of the first splicing strip, and the second magnet and the first magnetic block are attracted magnetically.

Through adopting above-mentioned technical scheme, after second arc plate body and the concatenation of a plurality of first arc plate bodies are accomplished, the staff only need with the lid fit on first concatenation strip, at this moment, second magnet and first magnetic path magnetism attract mutually to this makes zonulae occludens between second arc plate body and the adjacent first arc plate body, has strengthened the stability of the hollow cylinder structure of being spliced together by second arc plate body and a plurality of first arc plate bodies.

The utility model discloses further set up to: and a rubber sheet made of elastic rubber material is fixed on the side wall of the cover body close to one side of the first arc-shaped plate body.

Through adopting above-mentioned technical scheme, the sheet rubber adopts elastic rubber material to make, has good elasticity performance, through setting up the sheet rubber, when the lid fits on first concatenation strip, lid and first arc plate body combined action to this will have elastic sheet rubber and support tightly, thereby further strengthened the connection stability between second arc plate body and its adjacent first arc plate body.

The utility model discloses further set up to: and a handle groove is formed in the surface of one side, away from the hollow cylinder, of the cover body.

Through adopting above-mentioned technical scheme, through setting up the handle groove to this staff inserts the handle inslot with the finger, is favorable to the staff to open fast or close the lid.

The utility model discloses further set up to: the inner surface of the handle groove is provided with a frosting layer.

Through adopting above-mentioned technical scheme, the dull polish layer is polished by the internal surface in handle groove and is formed, and the dull polish layer surface has great coefficient of friction, through setting up the dull polish layer to this frictional force between the internal surface of staff's hand and handle groove has been increased, thereby has reduced the possibility that takes place to skid when the staff opens the lid.

The utility model discloses further set up to: the locking assembly comprises an insertion block fixed on the outer side arc surface of the hollow cylinder, an insertion groove arranged on the arc surface of one side, close to the hollow cylinder, of the second arc plate body and in insertion fit with the insertion block, a cylindrical groove arranged at the top of the insertion block, an insertion rod arranged in the cylindrical groove and in sliding fit with the cylindrical groove, a spring located in the cylindrical groove and a through hole arranged at the top of the second arc plate body and communicated with the insertion groove, one end of the spring is fixed with the inner bottom wall of the cylindrical groove, the other end of the spring is fixed with the lower end of the insertion rod, and the insertion rod is in sliding fit with the through hole.

Through adopting above-mentioned technical scheme, when fixed to hollow cylinder and second arc plate body, the staff only need impress the spliced pole in the cylindricality recess to make the spring shrink, make the grafting piece peg graft with the inserting groove simultaneously, afterwards, the staff only need loosen the spliced pole, in the spliced pole inserts the perforation, with this can realize fixing hollow cylinder and second arc plate body.

To sum up, the utility model discloses a beneficial technological effect does:

when the couplets are pasted, the hollow cylindrical structure is formed by the plurality of first arc-shaped plate bodies and the second arc-shaped plate body together through the arrangement of the plurality of first arc-shaped plate bodies and the second arc-shaped plate body, so that the surface of the cylindrical structure pasted with the couplets is subdivided into a plurality of sections of small arcs, and therefore the couplets can be pasted orderly by people, and the ornamental value of the couplets is improved;

according to the scheme, when the second arc-shaped plate body and the plurality of first arc-shaped plate bodies are spliced together to form the hollow cylindrical structure, workers only need to laminate the inner side arc-shaped surface of the second arc-shaped plate body with the outer side arc-shaped surface of the hollow cylinder, meanwhile, the worker needs to plug the splicing groove of one of the first arc-shaped plate bodies with the second splicing strip, then the workers need to sequentially splice the rest first arc-shaped plate bodies until the first splicing strip on the first arc-shaped plate body adjacent to the notch is inserted into the notch, at the moment, the workers only need to adopt the fixing assembly to fix the second arc-shaped plate body and the first arc-shaped plate body adjacent to the notch, and therefore installation work of the hollow cylindrical structure is completed; the second arc-shaped plate body and the plurality of first arc-shaped plate bodies are only in a simple splicing structure and are not bonded by glue, so that the green environmental protection concept is fully embodied;

in this scheme, the sheet rubber adopts elastic rubber material to make, has good elasticity performance, through setting up the sheet rubber, when the lid fits on first concatenation strip, lid and first arc plate body combined action to this will have elastic sheet rubber and support tightly, thereby further strengthened the connection stability between second arc plate body and its adjacent first arc plate body.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is another view structure diagram of the circular column structure of the present invention;

FIG. 3 is a schematic plan view of the overall structure of FIG. 2;

fig. 4 is a schematic structural view of a first arc-shaped plate body in the present invention;

fig. 5 is a schematic structural view of a second arc-shaped plate body in the present invention;

fig. 6 is a schematic structural view of the locking assembly of the present invention.

Reference numerals: 1. a hollow cylinder; 2. a first arc-shaped plate body; 21. a first splice bar; 211. a first chamfer; 22. splicing grooves; 3. a second arc-shaped plate body; 31. a second splice bar; 311. a second chamfer; 32. a notch; 4. a fixing assembly; 41. a cover body; 411. a rubber sheet; 412. a handle groove; 42. a first magnetic block; 43. a second magnet; 5. a locking assembly; 51. an insertion block; 52. inserting grooves; 53. a cylindrical groove; 54. a plug rod; 55. a spring; 56. and (6) perforating.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, for the utility model discloses a circular column structure is used to uniting to column, including hollow cylinder 1, first arc plate body 2 and second arc plate body 3. The hollow cylinder 1 is a cylindrical structure with a hollow interior, the axis of the hollow cylinder is vertical, and the upper end and the lower end of the hollow cylinder 1 are both open. First arc plate body 2 is the great arc platelike structure of thickness, and it is vertical setting, and the quantity of first arc plate body 2 is a plurality of, and the inboard arc surface of every first arc plate body 2 all laminates with the outside arc surface of hollow cylinder 1. The second arc plate body 3 is the great arc platelike structure of thickness, and it is vertical setting, and the inboard arc surface of second arc plate body 3 and the laminating of hollow cylinder 1's outside arc surface, the lateral wall of second arc plate body 3 both sides respectively with the laminating of the lateral wall of two first arc plate bodies 2, and second arc plate body 3 splices into hollow cylinder structure with a plurality of first arc plate bodies 2 in proper order, and this hollow cylinder structure wraps up in the hollow cylinder 1 outside.

As shown in fig. 3, each first arc-shaped plate body 2 is provided with a first splicing strip 21 and a splicing groove 22, the first splicing strip 21 is a strip-shaped structure with an arc-shaped cross section, and a side wall of one side of the first splicing strip 21 is fixed to a side wall of one side of the first arc-shaped plate body 2. The cross section of the splicing groove 22 is arc-shaped, and the splicing groove 22 is arranged on the side wall of the first arc-shaped plate body 2 far away from one side of the first splicing strip 21, and is in splicing fit with the first splicing strip 21. Through setting up first concatenation strip 21 and concatenation groove 22, and concatenation groove 22 and first concatenation strip 21 grafting cooperation to this is convenient for the staff splices into a whole with a plurality of first arc plate body 2 in proper order. The second arc-shaped plate body 3 is provided with a second splicing strip 31 and a notch 32, the second splicing strip 31 is of a strip-shaped structure with an arc-shaped cross section, the side wall of one side of the second splicing strip 31 is fixed with the side wall of one side of the second arc-shaped plate body 3, and the second splicing strip 31 is in splicing fit with the splicing groove 22. The notch 32 is opened on the position where the arc surface outside the second arc plate body 3 meets with the second arc plate body 3, and is located on one side of keeping away from the second splicing strip 31, and the area of the cross section of the notch 32 is larger than that of the cross section of the first splicing strip 21 so as to accommodate the first splicing strip 21.

As shown in fig. 4, a first chamfer 211 is provided on the first splicing strip 21, and the first chamfer 211 is provided at the intersection of the side wall of the first splicing strip 21 far from the splicing groove 22 and the arc surface of the first splicing strip 21 (including the inner and outer arc surfaces of the first splicing strip 21). As shown in fig. 5, a second chamfer 311 is provided on the second splicing strip 31, and the second chamfer 311 is provided at the intersection of the side wall of the second splicing strip 31 far from the notch 32 and the arc surface of the second splicing strip 31 (including the inner and outer arc surfaces of the second splicing strip 31). Through setting up first chamfer 211 and second chamfer 311, reduced the staff and carried out the degree of difficulty that splices first concatenation strip 21 and splice groove 22 and second concatenation strip 31 and splice groove 22 to this is convenient for the staff splices adjacent first arc plate body 2 and second arc plate body 3 and first concatenation strip 21, is favorable to improving the efficiency that the staff assembled this circular embracing post structure.

As shown in fig. 3, the notch 32 and the first splicing strip 21 near the notch 32 are jointly provided with a fixing assembly 4 for fixing the second arc-shaped plate 3 and the first arc-shaped plate 2 adjacent to the notch 32, and the fixing assembly 4 includes a cover 41, a first magnet 42 and a second magnet 43. The cover body 41 is of an arc-shaped plate-shaped structure, and is hinged to the position, close to the outer arc-shaped surface of the second arc-shaped plate body 3, of the notch 32, and when the first splicing strip 21 on the first arc-shaped plate body 2 adjacent to the notch 32 is inserted into the notch 32, the inner arc-shaped surface of the cover body 41 is attached to the outer arc-shaped surface of the first splicing strip 21. The first magnetic block 42 is a magnetic block with a rectangular cross section, and is embedded on the side wall of the cover 41 close to the hollow cylinder 1. The second magnet 43 is a magnetic block with a rectangular cross section, and is embedded on the side wall of the first splicing strip 21 (the first splicing strip 21 close to the notch 32) far away from the hollow cylinder 1, and the second magnet 43 and the first magnetic block 42 are attracted magnetically. Through setting up fixed subassembly 4, after second arc plate body 3 splices into hollow cylinder structure with a plurality of first arc plate body 2 in proper order, lid 41 lid fits on first concatenation strip 21, at this moment, second magnet 43 attracts mutually with first magnetic path 42 magnetism to this makes the linkage effect between second arc plate body 3 and the first arc plate body 2 inseparabler, has reduced the probability that becomes flexible appears in being connected between second arc plate body 3 and the first arc plate body 2.

As shown in fig. 3 and 5, the cover 41 is provided with a rubber sheet 411, the rubber sheet 411 has a sheet-like structure with a rectangular cross section, and the rubber sheet 411 is made of a rubber material with elasticity, and has good elasticity. Through setting up the sheet rubber 411, when lid 41 lid fits on first concatenation strip 21, lid 41 and first arc plate body 2 mating reaction and support sheet rubber 411 tightly to this has reduced the probability that lid 41 opened under the exogenic action, has strengthened the stability of this circular armful post structure.

As shown in fig. 2, the cover 41 is further provided with a handle groove 412, the cross section of the handle groove 412 is arc-shaped, and the handle groove 412 is opened on the surface of the cover 41 away from the hollow cylinder 1, so that a worker can insert fingers into the handle groove 412 and open the cover 41. The internal surface of handle groove 412 is equipped with the dull polish layer (not shown in the figure), and the dull polish layer is polished by the internal surface of handle groove 412 and is formed, and the dull polish layer surface has great coefficient of friction, through setting up the dull polish layer to this makes the frictional force between staff's hand and the handle groove 412 increase, has reduced the staff and has inserted the in-process of opening lid 41 with the finger and has taken place the possibility of skidding.

As shown in fig. 1, the hollow cylinder 1 and the second arc-shaped plate 3 are jointly provided with a locking assembly 5 for locking the hollow cylinder 1 and the second arc-shaped plate 3, and as shown in fig. 6, the locking assembly 5 includes a plug block 51, a plug groove 52, a cylindrical groove 53, a plug rod 54, a spring 55 and a through hole 56. The insertion block 51 is a block-shaped structure with a rectangular cross section, and the side wall thereof is fixed with the arc-shaped surface of the hollow cylinder 1 at the side far from the axis thereof. The cross section of the insertion groove 52 is rectangular, and it is opened on the arc surface of the second arc plate 3 near the hollow cylinder 1, and the insertion groove 52 is inserted and matched with the insertion block 51. The cylindrical recess 53 is circular in cross-section with its axis parallel to the axis of the hollow cylinder 1, the cylindrical recess 53 opening at the top of the plug-in block 51. The insertion rod 54 is a rod-shaped structure with a circular cross section, the axis of the insertion rod is overlapped with the axis of the cylindrical groove 53, and the insertion rod 54 is installed in the cylindrical groove 53 and is matched with the cylindrical groove in a sliding mode. The spring 55 is installed in the cylindrical recess 53, the expansion direction of the spring is parallel to the axial direction of the hollow cylinder 1, the lower end of the spring 55 is fixed with the inner bottom wall of the cylindrical recess 53, and the upper end of the spring 55 is fixed with the lower end of the insertion rod 54. The through hole 56 is formed in the top of the second arc-shaped plate 3, the extending direction of the through hole is parallel to the axial direction of the hollow cylinder 1, the through hole 56 is communicated with the insertion groove 52, and the insertion rod 54 is in sliding fit with the through hole 56. Through setting up locking Assembly 5, when fixed to hollow cylinder 1 and second arc plate body 3, the staff only needs to impress peg graft 54 in the cylindricality recess 53, and simultaneously, the staff need aim at peg graft 51 and inserting groove 52, subsequently, the staff need peg graft 51 and inserting groove 52, when the lateral wall of hollow cylinder 1 one side is kept away from to peg graft 51 and inserting groove 52 keep away from the inside wall butt of hollow cylinder 1 one side, the position of perforation 56 corresponds with cylindricality recess 53's position, at this moment, under spring 55's spring action, peg graft 54 inserts in the perforation 56, with this can realize fixing hollow cylinder 1 and second arc plate body 3, thereby improved this circular column structure's stability, reduced this circular column structure and pasted the probability that the position skew takes place in this circular column structure's antithetical couplet.

The implementation principle of the embodiment is as follows: when pasting the antithetical couplet, through setting up a plurality of first arc plate bodies 2 and a second arc plate body 3, form a hollow cylinder structure by a plurality of first arc plate bodies 2 and a second arc plate body 3 jointly to this will paste the cylindric structure surface segmentation of antithetical couplet and become the tiny arc of multistage, thereby be convenient for people will paste the antithetical couplet neatly, be favorable to improving the sight of antithetical couplet.

This scheme is through setting up fixed subassembly 4, and after second arc plate body 3 spliced into hollow cylinder structure with a plurality of first arc plate body 2 in proper order, lid 41 lid fits on first concatenation strip 21, and at this moment, second magnet 43 and first magnetic path 42 magnetism attract mutually to this makes the linkage effect between second arc plate body 3 and the first arc plate body 2 inseparabler, has reduced the probability that becomes flexible appears in being connected between second arc plate body 3 and the first arc plate body 2. This scheme is when fixed to hollow cylinder 1 and second arc plate body 3, and the staff only need impress peg rod 54 in the cylindricality recess 53 to make spring 55 shrink, make simultaneously peg block 51 and inserting groove 52 peg graft, afterwards, the staff only need loosen peg rod 54, peg rod 54 inserts in perforating 56, with this can realize fixing hollow cylinder 1 and second arc plate body 3.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a circular column structure is embraced to uniting, includes hollow circular cylinder (1), its characterized in that: the hollow cylinder (1) outside is equipped with first arc plate body (2) and second arc plate body (3), first arc plate body (2) are equipped with a plurality ofly, the inboard arc surface of first arc plate body (2) and the inboard arc surface of second arc plate body (3) all laminate with the outside arc surface of hollow cylinder (1), second arc plate body (3) splice into hollow cylinder structure with a plurality of first arc plate body (2) in proper order.

2. The circular pole pair structure of claim 1, wherein: every all be fixed with first concatenation strip (21), every on the lateral wall of first arc plate body (2) wherein one side all seted up on the lateral wall of first arc plate body (2) opposite side with first concatenation strip (21) grafting complex splice groove (22), be fixed with on the lateral wall of second arc plate body (3) wherein one side with splice groove (22) grafting complex second concatenation strip (31), offer breach (32) that are used for holding first concatenation strip (21) on the lateral wall of second arc plate body (3) opposite side is close to its outside arc surface's the position, breach (32) and the first concatenation strip (21) that are close to breach (32) department are installed jointly and are used for carrying out fixed subassembly (4) with second arc plate body (3) and breach (32) adjacent first arc plate body (2).

3. The circular pole pair structure of claim 2, wherein: the lateral wall that concatenation groove (22) one side was kept away from in first concatenation strip (21) is equipped with first chamfer (211) with the crossing department in arc surface of first concatenation strip (21), the crossing department in arc surface that the lateral wall that breach (32) one side was kept away from in second concatenation strip (31) and second concatenation strip (31) is equipped with second chamfer (311).

4. The circular pole pair structure of claim 2, wherein: fixed subassembly (4) including articulate lid (41) on notch (32) is close to the position on second arc plate body (3) outside arc surface, inlay and locate first magnetic path (42) on lid (41) are close to the lateral wall of hollow cylinder (1) one side and inlay and locate second magnet (43) on first concatenation strip (21) keep away from the lateral wall of hollow cylinder (1) one side, the inboard arc surface of lid (41) and the laminating of the outside arc surface of first concatenation strip (21), second magnet (43) and first magnetic path (42) magnetism attract mutually.

5. The circular pole pair structure of claim 4, wherein: and a rubber sheet (411) made of elastic rubber materials is fixed on the side wall of the cover body (41) close to one side of the first arc-shaped plate body (2).

6. The circular pole pair structure of claim 5, wherein: the surface of one side, away from the hollow cylinder (1), of the cover body (41) is provided with a handle groove (412).

7. The circular pole pair structure of claim 6, wherein: the inner surface of the handle groove (412) is provided with a frosted layer.

8. The circular pole pair structure of claim 1, wherein: the hollow cylinder (1) and the second arc-shaped plate body (3) are jointly provided with a locking assembly (5) for locking the hollow cylinder (1) and the second arc-shaped plate body, the locking assembly (5) comprises an insertion block (51) fixed with the outer arc-shaped surface of the hollow cylinder (1), an insertion groove (52) which is arranged on the arc-shaped surface of one side, close to the hollow cylinder (1), of the second arc-shaped plate body (3) and is in insertion fit with the insertion block (51), a cylindrical groove (53) which is arranged at the top of the insertion block (51), an insertion rod (54) which is arranged in the cylindrical groove (53) and is in sliding fit with the cylindrical groove (53), a spring (55) which is arranged in the cylindrical groove (53), and a through hole (56) which is arranged at the top of the second arc-shaped plate body (3) and is communicated with the insertion groove (52), one end of the spring (55) is fixed with the inner bottom wall of the cylindrical groove (53), and the other, the insertion rod (54) is in sliding fit with the through hole (56).