CN213856131U

CN213856131U - Internal cleaning structure of hollow vibrating rod

Info

Publication number: CN213856131U
Application number: CN202022206784.7U
Authority: CN
Inventors: 陈先均; 李正辉; 唐路平; 张峰
Original assignee: China Metallurgical Construction Engineering Group Co Ltd
Current assignee: China Metallurgical Construction Engineering Group Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-08-03
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses an inside clean structure of hollow stick of vibrating, include the hollow tube and be located the interior baffle of hollow tube inner tube sealing fixed connection, the hollow tube just is located the pipe shaft of interior baffle one side and distributes and have a plurality of exhaust holes that communicate with the hollow tube hole, the hollow tube is located and is provided with the direction slide bar on the pipe shaft of exhaust hole place side, the one end butt of direction slide bar is on interior baffle, another end threaded connection has stopper and stopper to fix on the hollow tube inner wall, it has the slider to slide on the direction slide bar, be provided with the brush hair on the slider, still be fixed with the pull pole on the slider, the hollow tube is located interior baffle opposite side and is provided with the pull piece, the pull pole passes interior baffle and fixes on the pull piece, the tip arch of direction slide bar has the connecting stud who passes interior baffle, connecting stud passes pull piece and screw-thread fit fastening nut. The utility model discloses simple structure, convenient to use is reliable, can clean the hollow vibrating rod inner wall after the use, has avoided the mortar to remain the jam to the exhaust hole.

Description

Internal cleaning structure of hollow vibrating rod

Technical Field

The utility model relates to a clean structure of pipe wall, concretely relates to clean structure of hollow vibrating rod inside.

Background

After the mortar is poured, the air is usually exhausted to exhaust air mixed in the mortar, so that the molding quality of the mortar is improved. Conventionally, a vibrating rod is inserted into mortar, and then the mortar is lifted outwards while vibrating, so that air in the mortar can float out of the mortar along with the lifting of the vibrating rod. However, the exhaust mode is only a mode of floating up by air, and the exhaust effect is poor.

In order to solve the technical problem, the inventor invents a vibrating rod structure with an exhaust function, which comprises a hollow pipe and a connecting post, wherein the hollow pipe is vertically arranged, the connecting post is positioned above the hollow pipe and is arranged at the same center line with the hollow pipe, a fixing stud is fixedly connected to the lower end surface of the connecting post, the fixing stud is arranged at the same center line with the connecting post, a fixing thread is arranged on an inner hole at the upper end of the hollow pipe, the hollow pipe is in thread fit with the fixing stud through the fixing thread so that the hollow pipe is fixed on the connecting post, an inner partition plate is fixedly connected in the hollow pipe in a sealing way, the position of the inner partition plate is close to one end, far away from the connecting post, of the hollow pipe, a plurality of exhaust holes are distributed on a pipe body, positioned at one side, facing the fixing thread, of the inner partition plate, the distribution positions of the plurality of exhaust holes extend along the center line direction of the hollow pipe and are distributed in a plum blossom shape around the circumference of the hollow pipe, the exhaust holes are communicated with the inner hole, the distribution extension section along the center line direction of the hollow pipe is close to the inner partition plate, still be provided with the venthole with hollow tube hole intercommunication on the body of tube of hollow tube, the venthole is located the position between fixed thread and a plurality of exhaust hole place distribution extension section, the lower extreme bolted connection of hollow tube has the lower extreme cover so that sealed cooperation between hollow tube and the lower extreme cover, the medial surface of lower extreme cover just is located the downthehole position fixedly connected with transverse vibration device of hollow tube, transverse vibration device is in order to provide the effort for hollow tube along its radial direction vibration, transverse vibration device is separated from setting with hollow tube inner wall and interior baffle respectively. However, after the vibrating rod is used, part of slurry in the mortar also enters the hollow pipe through the air vent and flows on the inner wall of the hollow pipe, so that the air vent is easily blocked.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: how to provide one kind can be to the inside pipe wall of hollow vibrating rod clean, can not cause the inside clean structure of hollow vibrating rod of influence to the inside exhaust of hollow vibrating rod again.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a hollow vibrating rod internal cleaning structure comprises a hollow tube and an inner baffle plate which is positioned in the hollow tube and is fixedly connected with the hollow tube in a sealing way, a plurality of exhaust holes which are communicated with the inner hole of the hollow tube are distributed on the tube body of the hollow tube and is positioned on one side of the inner baffle plate along the central line direction of the hollow tube, a guide slide bar is arranged in the inner hole of the hollow tube and is positioned on one side of the inner baffle plate facing the exhaust holes, the guide slide bar and the hollow tube are arranged at the same central line, one end of the guide slide bar facing the inner baffle plate is provided with a connecting stud along the central line direction in an extending way, the outer diameter of the connecting stud is smaller than the diameter of the guide slide bar, the connecting stud penetrates through the inner baffle plate and is in clearance fit with the inner baffle plate, a limiting block is also arranged in the inner hole of the hollow tube and is positioned on one side of the guide slide bar, the limiting block is close to the position of the tube opening on one side of the limiting block, and the tube wall of the hollow tube are arranged at intervals, a plurality of support rods are uniformly arranged in the hollow tube at intervals in the direction of the central line of the hollow tube at the position between the limiting block and the hollow tube, two ends of each support rod are respectively and fixedly connected with the limiting block and the inner wall of the hollow tube, one end of the guide slide rod, which is far away from the connecting stud, extends in the direction of the central line of the guide slide rod and is provided with a limiting stud, the outer diameter of the limiting stud is larger than the diameter of the guide slide rod, the limiting stud penetrates through the limiting block and is in threaded fit with the limiting block so that one end, which is located at the position of the connecting stud, of the guide slide rod is abutted against the inner partition plate, the guide slide rod is sleeved with a sliding block which can be in sliding fit with the guide slide rod along the direction of the central line of the guide slide rod, a circle of brush hair is annularly arranged on the inner wall of the hollow tube in the direction of the central line of the hollow tube, one end, which is far away from the sliding block, of the brush hair is abutted against the inner wall of the inner partition plate, a pull rod which is symmetrically arranged by taking the central line of the hollow tube as a symmetrical line, and the central line of the hollow tube is parallel to the direction of the hollow tube, the pull pole is towards the one end fixed connection on the slider in the slider, the pull pole passes in the inner separator towards the one end in the inner separator, the pull pole is in order to follow its central line direction and inner separator sliding seal cooperation, the one side that the exhaust hole was kept away from to the inner separator that just is located in the hollow tube is provided with the pull piece, the pull pole passes on the one end fixed connection of inner separator, the double-screw bolt perforation has been seted up to the position that just corresponds connecting stud on the pull piece, connecting stud passes in the double-screw bolt perforation, connecting stud just is located it and passes and has fastening nut in the screw-thread fit on the pole body of pull piece, the fastening nut butt is on the pull piece so that pull piece butt is on the inner separator, when the pull piece butt is on the inner separator, the position of slider is close to the position of stopper.

The utility model discloses in, in the use, remove fastening nut down, make a round trip reciprocal pulling pull piece, the pull piece just can drive the slider the same reciprocating motion of doing through the pull pole, at the in-process that the slider removed, the round brush hair that the ring was established on it also follows the motion equally, the brush hair of round is used in the inner wall of hollow tube, just can make a round trip not stop in its reciprocating motion to the hollow tube inner wall to be cleaned and brushed, clear away the thick liquid vestige on the hollow tube inner wall, avoid the thick liquid to solidify the jam in exhaust vent department.

And optimally, an inner hexagonal concave hole which is arranged along the same central line with the limiting stud is concavely arranged on the end surface of one end, far away from the guide slide rod, of the limiting stud. The limiting stud is conveniently screwed through a tool.

Preferably, an annular sealing gasket is sleeved on the connecting stud and between the guide slide rod and the inner partition plate, and the guide slide rod abuts against the annular sealing gasket to seal a gap between the guide slide rod and the inner partition plate. The airtightness is improved, and the slurry is prevented from entering the hollow pipe on the other side of the inner partition plate through the gap between the guide slide rod and the inner partition plate to damage the transverse vibration device.

As an optimization, the drawing block is of a cylindrical structure which is arranged with the connecting stud in the same central line, a plurality of strip-shaped finger grooves are uniformly arranged on the outer peripheral surface of the drawing block at intervals in the direction of the central line of the drawing block, the strip-shaped finger grooves extend in the direction parallel to the central line of the drawing block, and two ends of each strip-shaped finger groove are close to two ends of the drawing block in the direction of the central line of the drawing block respectively. The drawing operation is carried out on the drawing block by the finger of an operator.

To sum up, the beneficial effects of the utility model reside in that: the utility model discloses simple structure, convenient to use is reliable, can clean the hollow vibrating rod inner wall after using, has avoided the mortar to remain the back and has caused the jam to the exhaust hole.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 is a top view of a precast block forming die in an arc-shaped internal corner precast block forming die;

FIG. 2 is a schematic view of a lifting structure of a vibrating rod in an arc-shaped internal corner precast block forming die;

FIG. 3 is a schematic view of an installation structure of a vibrating rod in an arc-shaped internal corner precast block forming die;

fig. 4 is an internal structure schematic diagram of a vibrating rod in an arc-shaped internal corner prefabricated block forming die.

Detailed Description

The following describes the arc internal corner precast block forming die with the structure of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the mold for forming the arc-shaped internal corner prefabricated block in the present embodiment includes a bottom plate 1 horizontally disposed, two baffles 2 disposed oppositely and in parallel are disposed on an upper surface of the bottom plate 1, the baffles 2 are vertically disposed, bottoms of the baffles 2 are disposed on the upper surface of the bottom plate 1, two side plates 3 disposed oppositely and in parallel are disposed between the two baffles 2, the side plates 3 are vertically disposed and a plane thereof is perpendicular to a plane of the baffles 2, bottoms of the side plates 3 are disposed on the upper surface of the bottom plate 1, a slot is disposed on an inner side surface of the baffles 2 and corresponding to a position of the side plates 3 along a vertical direction, two ends of the side plates 3 respectively corresponding to the baffles 2 are respectively clamped into the corresponding slots, a square box structure with an open upper end is formed between the two baffles 2, the two side plates 3 and the bottom plate 1, a circular tube 4 is vertically disposed on an inner side of the square box structure, the outer peripheral face of pipe 4 butt respectively on two baffles 2 and two curb plates 3 and rather than tangent setting, the space that square box body structure inboard just is located between the position of its four corners and pipe 4 is for pouring the space, the lateral surface of curb plate 3 is provided with a plurality of baffle straining devices along the even interval of vertical direction, baffle straining device is including being fixed connection respectively at two 2 edges of baffle that lie in same one side and along the relative tensioning block 5 that sets up of two 2 relative directions of baffle, be provided with straining screw 6 along its relative direction between two tensioning blocks 5, straining block 5 of its both sides is worn respectively at the both ends of straining screw 6, straining screw 6 is in order to follow two 5 relative directions of tensioning block and tensioning block 5 sliding fit, straining screw 6 just lies in the pole body in the tensioning block 5 outside screw-thread fit has straining nut 7, straining nut 7 is in order to advance taut to two baffles 1 along its relative direction with the butt on the lateral surface of tensioning block 5.

In the present embodiment, a lifting driving motor 8 is fixedly connected to the bottom plate 1 in the circular tube 4, a lifting base 9 is disposed above the lifting driving motor 8, a supporting leg 10 is fixedly connected to the bottom plate 1 in the circular tube 4 and is used for supporting the bottom plate, a lifting screw 11 is arranged on the lifting base 9 along the direction of the central line of the circular tube 4 in a penetrating manner, the lifting screw 11 is in clearance fit with the lifting base 9, the lifting driving motor 8 is in transmission fit with the lifting screw 11 to drive the lifting screw 11 to rotate, two guide support rods 12 are symmetrically disposed on two sides of the lifting screw 11 and with the central line of the lifting screw 11 as a symmetry axis, the central line of each guide support rod 12 is parallel to the central line of the lifting screw 11, the lower ends of the guide support rods 12 are fixedly connected to the lifting base 9, and a lifting fixing seat 13 is disposed on the upper end of the lifting screw 11 and is in rotation fit with the lifting fixing seat, the upper end fixed connection of guide strut 12 is on lift fixing base 13, and lifting screw 11 just is located and is provided with on the pole body of lift base 9 top rather than screw-thread fit's lift adjustment seat 14, and guide strut 12 passes in lift adjustment seat 14 and can follow vertical direction and 14 sliding fit of lift adjustment seat, and lift adjustment seat 14 is last just to correspond every respectively the equal fixedly connected with support horizontal pole 15 of direction of pouring the space, support horizontal pole 15 is last just to be located it and correspond the stick that shakes of vertical extension is installed to the position of pouring the space top, when lift adjustment seat 14 moves down, the stick that shakes in order to stretch into rather than corresponding in pouring the space.

In the specific embodiment, a mounting hole is formed in the position, corresponding to the vibrating rod, of the supporting cross rod 15 along the vertical direction, a vibration damping rubber sleeve I16 which is in clearance fit with the mounting hole and has the same center line with the mounting hole is installed at the mounting hole, the upper end of the vibration damping rubber sleeve I16 extends out of the mounting hole, a circle of ring which has the same center line with the vibration damping rubber sleeve I16 is convexly formed on the peripheral surface of the vibration damping rubber sleeve I16, the ring is arranged on the upper surface of the supporting cross rod 15 to limit the downward movement of the vibration damping rubber sleeve I16, the lower end of the vibration damping rubber sleeve I16 extends out of the mounting hole, an annular concave hole which has the same center line with the vibration damping rubber sleeve I16 is concavely formed in the upper end surface of the vibration damping rubber sleeve I16, when the ring is abutted against the supporting cross rod 15, the bottom of the annular concave hole is positioned below the mounting hole, a plurality of vibration damping rubber particles 17 are filled in the annular concave hole, and the top of the vibrating rod is fixedly connected with a connecting column 18 which is arranged on the same center line with the vibrating rod, the diameter of spliced pole 18 is greater than the diameter of the stick that vibrates, spliced pole 18 pass in damping gum cover I16 and stretch out in the top of damping gum cover I16, spliced pole 18 and damping gum cover I16 clearance fit, the upper end fixedly connected with end plate 19 of spliced pole 18, end plate 19 butt is in order right in damping gum cover I16 upper end the stick that vibrates moves down carries on spacingly, and the projection of annular shrinkage pool along vertical direction is located end plate 19 along the projection of vertical direction, and the cover is equipped with lower connecting block 20 with spliced pole 18 sliding fit on the spliced pole 18 and the shaft that is located damping gum cover I16 below, just be provided with many clamping screw 21 around the even interval of mounting hole central line on the lower surface of support horizontal pole 15, clamping screw 21's central line is on a parallel with the central line of mounting hole, and clamping screw 21's upper end fixed connection is in on the support horizontal pole 15, the connecting hole of vertical setting has been seted up respectively to the position that corresponds each clamping screw 21 on lower connecting block 20, the damping rubber sleeve II which is the same as the damping rubber sleeve II is embedded in the connecting hole, the clamping screw 21 penetrates through the damping rubber sleeve II corresponding to the clamping screw 21 and is in clearance fit with the damping rubber sleeve II, the clamping screw 21 is in threaded fit with the clamping nut 22 on the rod body below the lower connecting block 20, and the clamping nut 22 is abutted to the lower connecting block 20 so that the end plate 19 and the lower connecting block 20 are abutted to the upper end and the lower end of the damping rubber sleeve I16 respectively.

In the specific embodiment, a fixing stud arranged on the same center line as the connecting column 18 is fixedly connected to the end face of the lower end of the connecting column 18, the vibrating rod comprises a hollow tube 23, a fixing thread is arranged on an inner hole at the upper end of the hollow tube 23, the hollow tube 23 is in threaded fit with the fixing stud through the fixing thread so that the hollow tube 23 is fixed on the connecting column 18, an inner partition 24 is fixedly connected in the hollow tube 23 in a sealing manner, the position of the inner partition 24 is close to one end, away from the connecting column 18, of the hollow tube 23, a plurality of exhaust holes 25 are distributed on a tube body of the hollow tube 23, which is positioned on one side, facing the fixing thread, of the inner partition 24, the distribution positions of the plurality of exhaust holes 25 extend along the center line direction of the hollow tube 23 and are distributed in a quincuncial shape around the circumference of the hollow tube 23, the exhaust holes 25 are communicated with the inner hole of the hollow tube 23, and the distribution extension sections of the plurality of the exhaust holes 25 along the center line direction of the hollow tube 23 are close to the inner partition 24, still be provided with the venthole with hollow tube 23 hole intercommunication on the pipe body of hollow tube 23, the venthole is located the position between fixed thread and the distribution extension section of a plurality of exhaust holes 25 place, the lower extreme bolted connection of hollow tube 23 has lower end cover 26 so that sealed cooperation between hollow tube 23 and the lower end cover 26, the medial surface of lower end cover 26 just is located the downthehole position fixedly connected with transverse vibration device 27 of hollow tube 23, transverse vibration device 27 is in order to provide the effort for hollow tube 23 along its radial direction vibration, transverse vibration device 27 is separated from setting with hollow tube 23 inner wall and interior baffle 24 respectively.

In this specific embodiment, a guide slide bar 28 is disposed in an inner hole of the hollow tube 23 on one side of the inner partition 24 facing the fixed thread, the guide slide bar 28 and the hollow tube 23 are disposed on the same center line, a connecting stud is disposed at one end of the guide slide bar 28 facing the inner partition 24 and extending along the center line direction thereof, the outer diameter of the connecting stud is smaller than the diameter of the guide slide bar 28, the connecting stud penetrates through the inner partition 24 and is in clearance fit with the inner partition 24, a position limiting block 29 is disposed in the inner hole of the hollow tube 23 and close to one end of the hollow tube 23 located at the fixed thread, the position limiting block 29 and the wall of the hollow tube 23 are disposed at intervals, a plurality of support rods 30 are disposed in the hollow tube 23 and uniformly spaced around the center line direction of the hollow tube 23 at a position between the position limiting block 29 and the hollow tube 23, two ends of a support rod 30 are respectively fixedly connected with a limit block 29 and the inner wall of the hollow tube 23, one end of the guide slide bar 28, which is far away from the connecting stud, is provided with a limit stud in an extending manner along the central line direction thereof, the outer diameter of the limit stud is larger than the diameter of the guide slide bar 28, the limit stud penetrates through the limit block 29 and is in threaded fit with the limit block 29 so that one end of the guide slide bar 28, which is located at the position of the connecting stud, abuts against the inner partition plate 24, the guide slide bar 28 is sleeved with a slide block 31 which can be in sliding fit with the guide slide block along the central line direction thereof, a circle of bristles 32 are annularly arranged on the slide block 31 around the central line direction of the hollow tube 23, one end of the bristles 32, which is far away from the slide block 31, abuts against the inner wall of the hollow tube 23, a drawing rod, one end of the drawing rod 33 facing the sliding block 31 is fixedly connected to the sliding block 31, one end of the drawing rod 33 facing the inner partition plate 24 penetrates through the inner partition plate 24, the drawing rod 33 can be in sliding sealing fit with the inner partition plate 24 along the central line direction thereof, a drawing block 34 is arranged in the hollow pipe 23 and on one side of the inner partition plate 24 facing the lower end cover 26, a drawing rod 33 penetrates through one end of the inner partition plate 24 and is fixedly connected to the drawing block 34, a stud through hole is formed in the drawing block 34 and corresponds to the position of the connecting stud, the connecting stud penetrates through the stud through hole, a fastening nut 35 is in threaded fit with the connecting stud and is arranged on the rod body penetrating through the drawing block 34, the fastening nut 35 abuts against the drawing block 34 so that the drawing block 34 abuts against the inner partition plate 24, when the drawing block 34 abuts on the inner partition 24, the position of the slider 31 is close to the position of the stopper 29.

In this specific embodiment, an end surface of one end of the limit stud, which is far away from the guide slide bar 28, is concavely provided with a hexagonal concave hole which is arranged along the same central line as the limit stud.

In this embodiment, an annular sealing gasket is sleeved on the connecting stud and between the guide slide 28 and the inner spacer 24, and the guide slide 28 abuts against the annular sealing gasket to seal a gap between the guide slide 28 and the inner spacer 24.

In this embodiment, the drawing block 34 is a cylinder structure that is arranged along the same central line of the connecting stud, a plurality of strip-shaped finger grooves are uniformly arranged on the outer peripheral surface of the drawing block 34 at intervals along the central line direction, the strip-shaped finger grooves are arranged along the direction parallel to the central line direction of the drawing block 34 in an extending manner, and the two ends of the strip-shaped finger grooves are respectively close to the two ends of the drawing block 34 along the central line direction.

Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides an inside clean structure of hollow vibrating rod, includes the hollow tube and be located the hollow tube and with the inner baffle of the sealed fixed connection of hollow tube, the hollow tube just is located the inner baffle and distributes on the pipe shaft along hollow tube central line direction one side and has a plurality of exhaust holes that communicate with the hollow tube hole, its characterized in that: a guide slide bar is arranged in an inner hole of the hollow tube, which is positioned at one side of the inner partition board facing the exhaust hole, the guide slide bar and the hollow tube are arranged at the same central line, one end of the guide slide bar, which faces the inner partition board, is provided with a connecting stud in an extending way along the central line direction, the outer diameter of the connecting stud is smaller than the diameter of the guide slide bar, the connecting stud penetrates through the inner partition board and is in clearance fit with the inner partition board, a limit block is also arranged in the inner hole of the hollow tube, which is positioned at one side of the guide slide bar, the limit block is close to the position of the orifice of the hollow tube at the side of the hollow tube, the limit block and the wall of the hollow tube are arranged at intervals, a plurality of support rods are uniformly arranged in the hollow tube around the central line direction of the hollow tube for the position between the limit block and the hollow tube, two ends of the support rods are respectively fixedly connected with the limit block and the inner wall of the hollow tube, and one end of the guide slide bar, which is far away from the connecting stud, is provided with a limit stud in an extending way along the central line direction, the outer diameter of the limiting stud is larger than the diameter of the guide slide rod, the limiting stud penetrates through the limiting block and is in threaded fit with the limiting block so that one end, located at the position of the connecting stud, of the guide slide rod abuts against the inner partition plate, a slide block capable of being in sliding fit with the limiting block along the direction of the central line of the guide slide rod is sleeved on the guide slide rod, a circle of brush hair is arranged on the slide block in a surrounding mode in the direction of the central line of the hollow tube, one end, away from the slide block, of the brush hair abuts against the inner wall of the hollow tube, pull rods symmetrically arranged by taking the central line of the hollow tube as a symmetrical line are arranged between the slide block and the inner partition plate, the direction of the central line of each pull rod is parallel to the direction of the central line of the hollow tube, one end, facing the slide block, of each pull rod penetrates through the inner partition plate, the pull rods can be in sliding sealed fit with the inner partition plate along the direction of the central line of the pull rods, and one side, away from the exhaust holes, of the inner partition plate, is provided with a pull block, the pull rod penetrates through one end of the inner partition plate and is fixedly connected to the pull block, a stud hole is formed in the position, corresponding to the connecting stud, of the pull block, the connecting stud penetrates through the stud hole, the connecting stud is located on the rod body, penetrating through the pull block, of the pull block, and is in threaded fit with a fastening nut, the fastening nut abuts against the pull block so that the pull block abuts against the inner partition plate, and when the pull block abuts against the inner partition plate, the position of the sliding block is close to the position of the limiting block.

2. The hollow tamper bar interior cleaning structure of claim 1, wherein: and an inner hexagonal concave hole which is arranged at the same central line as the limiting stud is concavely arranged on the end surface of one end, far away from the guide slide rod, of the limiting stud.

3. The hollow tamper bar interior cleaning structure of claim 1, wherein: an annular sealing gasket is sleeved on the connecting stud and positioned between the guide slide rod and the inner partition plate, and the guide slide rod is abutted against the annular sealing gasket so as to seal a gap between the guide slide rod and the inner partition plate.

4. The hollow tamper bar interior cleaning structure of claim 1, wherein: the pull piece be with the cylinder structure that connecting stud set up with the central line, be provided with many bars around the even interval of central line direction on the outer peripheral face of pull piece and indicate the groove, the bar indicates the groove along being on a parallel with pull piece central line direction extends the setting, and the both ends in bar indicates the groove are close to respectively the both ends of pull piece along central line direction.