CN214559047U

CN214559047U - Sliding sleeve movement limiting device

Info

Publication number: CN214559047U
Application number: CN202120932757.XU
Authority: CN
Inventors: 田越增; 韩琳; 蒋吉桂; 李供鸿
Original assignee: China Metallurgical Construction Engineering Group Co Ltd
Current assignee: China Metallurgical Construction Engineering Group Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-11-02
Anticipated expiration: 2031-04-30

Abstract

The utility model discloses a sliding sleeve removes stop device, the push rod-type switch comprises a push rod, push rod one end is fixed with a bolt card section of thick bamboo, the cover is equipped with the regulation sliding sleeve on the push rod, just follow the relative fixing base that sets up of push rod central line direction on regulation sliding sleeve and the bolt card section of thick bamboo, be provided with fixed pull rod along its relative direction between two fixing bases, the one end of fixed pull rod is fixed on one of them fixing base, the other end passes another fixing base, the rigidity that the fixing base corresponds fixed pull rod and passes has fixed sleeve, fixed pull rod passes fixed sleeve, fixed sleeve's distal end arch has the fastening sleeve pipe that the external diameter becomes big, the last bar breach of having seted up of fastening sleeve pipe, the cover is equipped with the fastening and presses the cover on the fixed sleeve pipe, the fastening is pressed the cover and can compress tightly on fixed pull rod through fastening sleeve pipe. The utility model discloses simple structure through fastening sleeve to compressing tightly of fixed pull rod, and then makes the adjusting sliding sleeve fixed position fix on the push rod.

Description

Sliding sleeve movement limiting device

Technical Field

The utility model relates to a sliding sleeve sliding positioning fixed knot constructs, concretely relates to sliding sleeve removes stop device.

Background

At present, in installation engineering, the equipment is usually fixedly connected by matching a bolt and a nut, so that an operator needs to thread the bolt through the corresponding equipment and then screw the nut on a screw rod of the bolt to complete fixed installation. However, in some narrow spaces, the operator cannot enter the site or cannot reach the installation position by hand, and thus cannot install the vehicle by using the bolt.

In order to conveniently send the bolt to a corresponding installation position, the inventor invents a bolt pushing structure, which comprises a push rod, wherein one end of the push rod is provided with a bolt clamping cylinder which is concentric with the push rod, the push rod is fixedly connected to the bottom of the bolt clamping cylinder, the cross section of an inner hole of the bolt clamping cylinder is rectangular, the width of the cross section of the inner hole of the bolt clamping cylinder is larger than the width of the opposite side of the head of the bolt to be installed, slide blocks are oppositely arranged in the inner hole of the bolt clamping cylinder along the length direction of the cross section of the inner hole of the bolt clamping cylinder, the slide blocks are accommodated in the inner hole of the bolt clamping cylinder, can be respectively in sliding fit with the inner hole of the bolt clamping cylinder along the length direction of the cross section of the inner hole of the bolt clamping cylinder, V-shaped limiting grooves which are opposite and extend along the direction parallel to the central line of the bolt clamping cylinder are respectively arranged on the side surfaces of one opposite sides of the two slide blocks, and are through grooves which can be abutted against the adjacent two side edges of the nut to be installed, a bolt limiting space for limiting the head of a bolt to be installed is formed between the two V-shaped limiting grooves, one side of the sliding block, which is back to the V-shaped limiting grooves, is fixedly connected with a guide rod which extends along the length direction of the cross section of the inner hole of the bolt clamping cylinder, the guide rod penetrates through the bolt clamping cylinder along the central line direction and extends out of the bolt clamping cylinder, the guide rod can be in sliding fit with the bolt clamping cylinder along the central line direction of the guide rod, an adjusting sliding sleeve is sleeved on the push rod and can be in sliding fit with the push rod along the central line direction of the push rod, an adjusting pull rod is arranged between the adjusting sliding sleeve and one end of the two guide rods, which are positioned outside the bolt clamping cylinder, the two ends of the adjusting pull rod are respectively hinged with the adjusting sliding sleeve and one end of the guide rod, which is positioned outside the bolt clamping cylinder, when the adjusting sliding sleeve moves along the central line direction of the push rod, the adjusting sliding sleeve can pull the guide rod to move along the central line direction of the guide rod through the adjusting pull rod, be provided with the sliding sleeve on the adjusting sliding sleeve and remove stop device, the sliding sleeve removes stop device and fixes the adjusting sliding sleeve location on the push rod. But how the sliding sleeve movement limiting device is arranged can be conveniently positioned and fixed on the push rod by the adjusting sliding sleeve, and further consideration is needed.

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 a sliding sleeve that can conveniently make the adjusting sliding sleeve fix a position and fix on the push rod removes stop device.

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

a sliding sleeve movement limiting device comprises a push rod, wherein one end of the push rod is provided with a bolt clamping cylinder which is concentric with the push rod, the bottom of the bolt clamping cylinder is fixedly connected with the push rod, the push rod is sleeved with an adjusting sliding sleeve which can be in sliding fit with the push rod along the direction of the central line of the push rod, the adjusting sliding sleeve and a fixing seat which is arranged on the bolt clamping cylinder and is opposite to the direction of the central line of the push rod are arranged, a fixed pull rod is arranged between the two fixing seats along the opposite direction of the fixing seat, one end of the fixed pull rod is connected onto one fixing seat in a threaded manner, the other end of the fixed pull rod penetrates through the other fixing seat, a pull rod perforation which is used for enabling the fixed pull rod to penetrate through is arranged on the fixing seat corresponding to the fixed pull rod, one side of the fixing seat where the pull rod perforation is arranged and is back to the other fixing seat is fixedly connected with a fixed sleeve, the fixed sleeve and the fixed pull rod penetrates through the fixed sleeve and can be in sliding fit with the central line of the fixed sleeve, the one end that fixed sleeve kept away from the fixing base is formed with the fastening sleeve that the external diameter gradually becomes big along its outside arch of central line direction, fastening sleeve's internal diameter is unanimous with fixed sleeve's internal diameter, fastening sleeve keeps away from fixed sleeve's one end and is equipped with many bar splits around its central line direction evenly spaced apart, the bar split extends to fastening sleeve's the other end along parallel fastening sleeve central line direction, the cover is equipped with and can presses the cover rather than sliding fit's fastening along its central line direction on the fixed sleeve, when the fastening is pressed the cover and is moved towards fastening sleeve major diameter end direction, the fastening is pressed the cover and is fixed mutually so that fastening sleeve compresses tightly on fixed pull rod and make fastening sleeve and fixed pull rod.

The utility model discloses in, after adjusting the sliding sleeve and removing the position, the cover is pressed in the fastening that slides, makes the fastening press the cover to remove from fixed sleeve pipe towards the adapter sleeve pipe direction, utilizes the reducing structure of adapter sleeve pipe external diameter, makes the fastening press the cover to extrude on the adapter sleeve pipe, presses the deformation of cover through the fastening, makes the fastening press the cover to press the fixed pull rod to press tightly, and then accomplishes the location fixed to adjusting the sliding sleeve.

As an optimization, a fastening external thread extending from one end of the fastening external thread to the other end of the fastening external thread is arranged on the outer peripheral surface of the fastening sleeve along the central line direction of the fastening sleeve, a fastening internal thread extending from one end of the fastening external thread is arranged on the inner wall of the fastening pressing sleeve along the central line direction of the fastening pressing sleeve, when the fastening pressing sleeve moves towards the direction of the fastening sleeve, the fastening pressing sleeve can be connected to the fastening sleeve through the fastening internal thread and the fastening external thread in a thread fit manner, a plurality of screwing insertion holes are formed in the sleeve body of the fastening pressing sleeve at uniform intervals along the central line direction of the sleeve body, the screwing insertion holes extend along the radial direction of the fastening pressing sleeve, one screwing insertion hole is provided with one screwing insertion rod, one end of the screwing insertion rod is inserted into the screwing insertion hole, and the screwing insertion rod can be matched with the screwing insertion hole in a sliding manner along the central line direction of the screwing insertion hole. Through screw-thread fit's relation, can make the fastening press the more firm fixing on the fastening sleeve pipe of cover, avoid not hard up, when twisting the fastening and pressing the cover, can press the rotation of cover along with the fastening simultaneously, will twist to change the inserted bar and insert the not indissolvable twisting that twists and turn in the jack and go to rotate the fastening and press the cover, make the operation more convenient.

Preferably, a resisting spring is sleeved on the fastening sleeve and at a position between the fixing seat where the fastening sleeve is located and the fastening pressing sleeve, and two ends of the resisting spring are respectively abutted against the fixing seat corresponding to the resisting spring and the fastening pressing sleeve to provide spring force for the fastening pressing sleeve to move towards the direction of the large-diameter end of the fastening sleeve. Can press the cover for the fastening and provide the effort towards fastening sleeve pipe major diameter end direction, avoid not hard up.

As optimization, the embedded bar rubber strip that is equipped with of bar breach, bar rubber strip are followed its place bar breach extending direction extends the setting, and bar rubber strip fixed connection is at its place respectively on the both sides lateral wall of bar breach, the inside and outside both sides side of bar rubber strip respectively with fastening sleeve's inside and outside face flushes. Fastening sleeve pipe is at the in-process of deformation, and the part of bar breach both sides can extrude bar rubber strip, and bar rubber strip also can warp like this, also can extrude fixed pull rod equally for it is more firm to fix the pull rod.

To sum up, the beneficial effects of the utility model reside in that: the utility model discloses simple structure through fastening sleeve to compressing tightly of fixed pull rod, and then makes the adjusting sliding sleeve fixed position fix on the push rod.

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 schematic structural view of a bolt installation tool.

Detailed Description

The following will make further detailed description of the bolt installation tool using the structure of the present invention with reference to the accompanying drawings.

As shown in fig. 1, the bolt installation tool in this embodiment includes a support sleeve 1, a push rod 2 capable of sliding fitting with the support sleeve 1 along a central line direction of the support sleeve 1 penetrates through the support sleeve 1, two ends of the push rod 2 respectively extend out of two ends of the support sleeve 1, one end of the push rod 2 is a working end, the other end is an operating end, the operating end of the push rod is provided with a bolt clamping cylinder 3 arranged along the same central line as the push rod 2, a cylinder bottom end of the bolt clamping cylinder 3 is fixedly connected with the push rod 2, an inner hole of the bolt clamping cylinder 3 is used for placing a head of a bolt to be installed, a hole wall of the bolt clamping cylinder 3 is capable of limiting rotation of the bolt to be installed around the central line direction, a depth of the inner hole of the bolt clamping cylinder 3 is less than or equal to a thickness of the head of the bolt to be installed, a limit position on one side of the bolt clamping cylinder 3 in a cylinder opening direction is provided with a limit position along the same central line as the bolt clamping cylinder 3, fixedly connected with linking bridge and through linking bridge and support sleeve 1 fixed connection on the spacing cutting ferrule, the hole of spacing cutting ferrule is in order to be used for placing and treats mounting nut, the pore wall of spacing cutting ferrule is in order to treat mounting nut and restrict around its central line direction rotation, the one end fixedly connected with that spacing cutting ferrule is back to bolt calorie of section of thick bamboo 3 is used for treating mounting nut and carries out spacing stopper 4, the hole length of spacing cutting ferrule is less than or equal to the thickness of treating mounting nut.

In the specific embodiment, the cross section of the inner hole of the bolt clamping cylinder 3 is rectangular, the width of the cross section of the inner hole of the bolt clamping cylinder 3 is greater than the width of the opposite side of the head of the bolt to be installed, sliders are oppositely arranged in the inner hole of the bolt clamping cylinder 3 along the length direction of the cross section of the inner hole of the bolt clamping cylinder 3, the sliders are accommodated in the inner hole of the bolt clamping cylinder 3, the sliders can be respectively in sliding fit with the inner hole of the bolt clamping cylinder 3 along the length direction of the cross section of the inner hole of the bolt clamping cylinder 3, V-shaped limiting grooves which are opposite and extend along the direction parallel to the central line of the bolt clamping cylinder 3 are respectively arranged on the side surfaces of one side opposite to the two sliders, each V-shaped limiting groove is a through groove which can be abutted against the side surfaces of the two adjacent sides of the nut to be installed, and a bolt limiting space for limiting the head of the bolt to be installed is formed between the two V-shaped limiting grooves, one side of each sliding block, which is back to the V-shaped limiting groove, is fixedly connected with a guide rod 5 extending along the length direction of the cross section of the inner hole of the bolt clamping cylinder 3, the guide rod 5 penetrates through the bolt clamping cylinder 3 along the central line direction of the guide rod 5 and extends out of the bolt clamping cylinder 3, the guide rod 5 can be in sliding fit with the bolt clamping cylinder 3 along the central line direction of the guide rod, sliding block positioning devices are arranged on the two sliding blocks, and the sliding block positioning devices can respectively act on the two sliding blocks to perform positioning control on the distance between the two sliding blocks;

the limiting clamping sleeve comprises two clamping blocks 6 which are symmetrically arranged by taking the central line of the bolt clamping cylinder 3 as a symmetry axis, the limiting blocks 4 are two and are respectively and fixedly connected to the two clamping blocks 6, V-shaped clamping grooves which are opposite and extend along the direction parallel to the central line of the bolt clamping cylinder 3 are respectively arranged on the side surfaces of the opposite sides of the two clamping blocks 6, the V-shaped clamping grooves are through grooves and can be abutted against the adjacent two side edges of a nut to be installed, a nut limiting space for limiting the nut to be installed is formed between the two V-shaped clamping grooves, two sliding rods 7 which are arranged in parallel are respectively arranged between the two clamping blocks 6 and respectively positioned at the outer sides of the V-shaped clamping grooves, the central line of the bolt clamping cylinder 3 is vertical to the plane where the central lines of the two sliding rods 7 are located, the clamping blocks 6 on the sides of the sliding rods 7 are respectively penetrated through the two ends of the sliding rods 7, and the sliding rods 7 can be in sliding fit with the clamping blocks 6 along the direction of the central lines, the two clamping blocks 6 are respectively provided with an outer connecting block 8 on one side opposite to each other, two ends of the sliding rod 7 are respectively fixedly connected to the outer connecting blocks 8 on the side where the sliding rod is located, the connecting support comprises outer connecting rods 9 respectively fixedly connected to the outer connecting blocks 8, the central line of each outer connecting rod 9 is parallel to the central line of the bolt clamping cylinder 3, one end, far away from the outer connecting blocks 8, of each outer connecting rod 9 is fixedly connected to the supporting sleeve 1, clamping block positioning devices are respectively installed on one sides, opposite to each other, of the two clamping blocks 6, and the clamping block positioning devices can act on the corresponding clamping blocks 6 to perform positioning control on the distance between the two clamping blocks 6.

In this embodiment, the sliding block positioning device comprises an adjusting sliding sleeve 10 sleeved on the push rod 2 and located on the rod body between the bolt clamping cylinder 3 and the support sleeve 1, the adjusting sliding sleeve 10 can be in sliding fit with the push rod 2 along the direction of the central line thereof, an adjusting pull rod 11 is respectively arranged between the adjusting sliding sleeve 10 and one end of the two guide rods 5 located outside the bolt clamping cylinder 3, two ends of the adjusting pull rod 11 are respectively hinged with the adjusting sliding sleeve 10 and one end of the guide rods 5 located outside the bolt clamping cylinder 3, when the adjusting sliding sleeve 10 is along 2 central line directions of push rod move, adjusting sliding sleeve 10 in order to be able to pass through adjusting pull rod 11 pulling guide bar 5 is followed 5 central line directions of guide bar move, are provided with the sliding sleeve on the adjusting sliding sleeve 10 and remove stop device, and the sliding sleeve removes stop device in order to be able to fix an adjusting sliding sleeve 10 position on push rod 2.

In this embodiment, the sliding sleeve movement limiting device includes fixing bases 12 respectively fixed on the adjusting sliding sleeve 10 and the bolt clamping cylinder 3 and oppositely arranged along the central line direction of the push rod 2, a fixing pull rod 13 is arranged between the two fixing bases 12 along the opposite direction, one end of the fixing pull rod 13 is connected to one of the fixing bases 12 by screw thread, the other end is penetrated through the other fixing base 12, a pull rod through hole for the fixing pull rod 13 to penetrate is arranged at the position of the fixing base 12 corresponding to the fixing pull rod 13, a fixing sleeve 14 is fixedly connected to the fixing base 12 where the pull rod through hole is located and the side of the fixing base 12 opposite to the other fixing base 12, the fixing sleeve 14 and the pull rod through hole are arranged on the same central line, the fixing pull rod 13 penetrates through the fixing sleeve 14 and can be in sliding fit with the fixing sleeve 14 along the central line direction, a fastening sleeve 15 with gradually increased outer diameter is formed by outwardly protruding one end of the fixing sleeve 14 far away from the fixing base 12 along the central line direction, the internal diameter of fastening sleeve 15 is unanimous with the internal diameter of fixed sleeve 14, many bar splits 16 have been seted up around the even interval of central line direction to the one end of fastening sleeve 15 far away from fixed sleeve 12, bar split 16 extends to the other end of fastening sleeve 15 along parallel fastening sleeve 15 central line direction, the cover is equipped with and can presses the cover 17 with its sliding fit's fastening along its central line direction on the fixed sleeve 14, when fastening is pressed the cover 17 and is removed towards the big diameter end direction of fastening sleeve 15, fastening is pressed the cover 17 and is made fastening sleeve 15 and fixed pull rod 13 fixed mutually so that fastening sleeve 15 compresses tightly on fixed pull rod 13.

In this embodiment, a fastening external thread extending from one end to the other end of the fastening sleeve 15 is provided on the outer circumferential surface of the fastening sleeve 15 along the central line direction of the fastening sleeve 15, the inner wall of the fastening pressing sleeve 17 is provided with a fastening internal thread at the other end extending from one end of the fastening pressing sleeve 17 along the central line direction of the fastening pressing sleeve 17, when the fastening pressing sleeve 17 moves towards the direction of the fastening sleeve 15, the fastening pressing sleeve 17 can be connected on the fastening sleeve 15 through the threaded matching of the fastening internal thread and the fastening external thread, a plurality of twisting jacks are uniformly arranged on the sleeve body of the fastening pressing sleeve 17 at intervals along the direction of the central line of the sleeve body, the twisting jacks extend along the radial direction of the fastening pressing sleeve 17, one of them is twisted the jack and is provided with one and twists the inserted bar, twists the one end of changeing the inserted bar and insert in twisting the jack, twist the inserted bar of changeing and can follow and twist jack central line direction rather than sliding fit.

In this embodiment, a resisting spring is sleeved on the fastening sleeve 15 and at a position between the fixed seat 12 where the fastening sleeve 15 is located and the fastening pressing sleeve 17, and two ends of the resisting spring respectively abut against the fixed seat 12 and the fastening pressing sleeve 17 corresponding thereto to provide a spring force for the fastening pressing sleeve 17 to move towards the direction of the large-diameter end of the fastening sleeve 15.

In this embodiment, embedded bar rubber strip that is equipped with of bar breach 16, bar rubber strip is along its place 16 extending direction of bar breach extends the setting, and bar rubber strip fixed connection is at its place respectively on the both sides lateral wall of bar breach 16, the inside and outside both sides side of bar rubber strip respectively with the inside and outside face of fastening sleeve 15 flushes.

In this specific embodiment, fixture block positioner is including being located it and corresponding fixture block 6 with right angle wedge 18 between the outer connecting block 8, two right angle wedges 18 with 3 central lines of bolt calorie of section of thick bamboo are symmetry axis symmetry setting, and right angle wedge 18 is located two position between the slide bar 7, right angle wedge 18's wedge face butt is in on the fixture block 6, one of them right angle face butt of right angle wedge 18 is in on the outer connecting block 8 and can follow and be on a parallel with 3 central line directions of bolt calorie of section of thick bamboo and outer connecting block 8 sliding fit, be fixed with on another right angle face of right angle wedge 18 and establish its place side guide block 19 on the outer connecting rod 9, guide block 19 can follow outer connecting rod 9 central line direction and its sliding fit are provided with piece removal stop device on the guide block 19, and piece removal stop device is in order to fix the guide block 19 location on the outer connecting rod 9.

In this embodiment, a synchronous operating rod 20 parallel to the sliding rod 7 is disposed between the two guide blocks 19, and two ends of the synchronous operating rod 20 are respectively fixedly connected to the guide blocks 19 on the sides thereof.

In this specific embodiment, the block limiting device includes a positioning bolt, a screw rod of the positioning bolt penetrates through the guide block 19 along a radial direction of the positioning bolt corresponding to the outer connecting rod 9, the screw rod of the positioning bolt is in threaded fit with the guide block 19, and the screw rod of the positioning bolt can abut against the corresponding outer connecting rod 9 to fix the guide block 19 and the outer connecting rod 9.

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 a stop device is removed to sliding sleeve, includes the push rod, push rod one end be provided with rather than the bolt card section of thick bamboo with the central line, the bottom and the push rod fixed connection of a bolt card section of thick bamboo, the cover is equipped with can follow its central line direction rather than sliding fit's regulation sliding sleeve on the push rod, its characterized in that: the bolt clamping device comprises a regulating sliding sleeve, fixing seats, a fixed pull rod, a fixed sleeve and a bolt clamping cylinder, wherein the fixing seats are arranged on the regulating sliding sleeve and the bolt clamping cylinder and are oppositely arranged along the central line direction of a push rod, the fixed pull rod is arranged between the two fixing seats along the opposite direction, one end of the fixed pull rod is connected to one of the fixing seats in a threaded manner, the other end of the fixed pull rod penetrates through the other fixing seat, a pull rod through hole for the fixed pull rod to penetrate through is formed in the position of the fixing seat corresponding to the fixed pull rod, a fixed sleeve is fixedly connected to the fixing seat where the pull rod through hole is arranged on one side of the fixing seat back to the other fixing seat, the fixed sleeve and the pull rod through hole are arranged at the same central line, the fixed pull rod penetrates through the fixed sleeve and can be in sliding fit with the fixed sleeve along the central line direction of the fixed sleeve, one end, far away from the fixing sleeve, is outwards protruded along the central line direction of the fixed sleeve to form a fastening sleeve with gradually increased outer diameter, the inner diameter which is consistent with the inner diameter of the fixing sleeve, and a plurality of strip-shaped gaps are evenly spaced along the central line direction of the fastening sleeve, the bar breach extends to the other end of fastening sleeve pipe along parallel fastening sleeve pipe central line direction, and the cover is equipped with and presses the cover rather than sliding fit's fastening along its central line direction on the fixed sleeving, when the fastening pressed the cover to remove in fastening sleeve pipe major diameter end direction, the fastening pressed the cover in order to make fastening sleeve pipe and fixed pull rod fixed mutually so that fastening sleeve pipe compresses tightly on fixed pull rod.

2. The sliding sleeve movement limiting device according to claim 1, wherein: follow on the fastening sleeve's the outer peripheral face fastening sleeve central line direction is provided with the fastening external screw thread that extends to the other end by its one end, follow on the inner wall of fastening pressure cover central line direction is provided with the fastening internal thread by the other end that its one end extends, works as fastening pressure cover orientation when fastening sleeve direction removes, fastening pressure cover can be connected through fastening internal thread and fastening external screw thread screw-thread fit on the fastening sleeve, fastening pressure cover is on one's body has seted up a plurality of wrong commentaries on classics jacks around its central line direction is even at interval, twists the jack and follows fastening pressure cover radial direction extends the setting, and one of them is twisted the jack and is provided with one and is twisted the inserted rod, twists the one end of changeing the inserted rod and twist in the jack, twists the pole and can follow and twist jack central line direction rather than sliding fit.

3. The sliding sleeve movement limiting device according to claim 1, wherein: and a propping spring is sleeved on the fastening sleeve and positioned between the fixed seat where the fastening sleeve is positioned and the fastening pressing sleeve, and two ends of the propping spring are respectively butted on the fixed seat corresponding to the propping spring and the fastening pressing sleeve so as to provide spring force for the fastening pressing sleeve to move towards the direction of the large-diameter end of the fastening sleeve.

4. The sliding sleeve movement limiting device according to claim 1, wherein: the embedded bar rubber strip that is equipped with of bar breach, bar rubber strip are along its place bar breach extending direction extends the setting, and bar rubber strip fixed connection is at its place respectively on the both sides lateral wall of bar breach, the inside and outside both sides side of bar rubber strip respectively with fastening sheathed tube inside and outside face flushes.