CN213811990U

CN213811990U - Self-sealing type orifice clamping device

Info

Publication number: CN213811990U
Application number: CN202022875424.6U
Authority: CN
Inventors: 胡少斌; 庞烁钢; 张奕哲; 颜正勇
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-07-27
Anticipated expiration: 2030-12-02

Abstract

The utility model provides a self-sealing orifice clamping device, which comprises a self-sealing component and an orifice clamping component; the orifice clamping component comprises a cylindrical hollow cylinder (3), a top plate of the hollow cylinder (3) is provided with a first through hole, and an external rotating block (2) is rotationally connected in the first through hole; the bottom end of the external rotating block (2) is provided with a threaded hole (12) penetrating into the external rotating block, and the threaded hole (12) is internally connected with a pushing rod (7) in a threaded manner; a third through hole is formed in a bottom plate (8) of the hollow cylinder (3), and the long straight rod part (9) penetrates through the third through hole and is fixedly connected with a support plate (10) of the self-sealing member. The utility model also discloses a construction method of self-sealing type drill way screens device. The utility model discloses a mechanical type is from canned type drill way screens device is applicable to multiple drill way shutoff, does not use other plugging material (quick-drying cement etc.), but reuse, the shutoff is high-efficient, the good and operation of being convenient for of leakproofness.

Description

Self-sealing type orifice clamping device

Technical Field

The utility model relates to a self-sealing type drill way screens device belongs to blasting device, blasting big gun hole drill way and big gun hole shutoff technical field.

Background

In municipal traffic engineering such as mining of mines and stones, excavation of foundation pits, construction of tunnels and underground spaces, safe blasting demolition of hard stones/boulders, blockage and dredging of pipelines and the like, blasting is often needed. The blasting fracturing method has the characteristics of high efficiency, low cost and the like, and is widely applied to rock excavation in mining engineering, underground traffic engineering, water conservancy and hydropower engineering and the like.

The blast hole plugging plays an important role in engineering blasting, and the reasonable plugging can ensure that the explosive fully reacts, so that the explosive emits maximum heat, the generation of toxic gas is reduced, and the explosive energy utilization rate is improved; the damage of air shock waves to surrounding roadways and surrounding buildings is reduced, meanwhile, the risk of explosion such as gas dust is reduced, and the blasting effect is improved.

Blast hole plugging is used as an important link in the deep hole presplitting blasting process, and directly influences the blasting quality. The reasonable blast hole plugging can prolong the action time of explosive gas, improve the utilization rate of the blast hole, reduce the quantity of flying stones, reduce the explosion risks of dust, gas and the like and improve the blasting effect.

At present, most of metal and nonmetal underground medium-length hole blasting is insufficient in understanding of the effect of blocking a blast hole by people in the blasting process, and a plurality of blasting projects are not blocked, so that the expected blasting effect is usually realized by increasing the explosive quantity. With the understanding of people on the plugging effect of blast holes, more and more blast holes are plugged in blasting engineering.

The conventional blast hole plugging is filled by adopting quick-drying cement and the like, and the common blast hole plugging is formed by kneading clay (added with a small amount of water) and then manually plugging the blast hole, and a stick is used for tamping the plug while plugging. For downward blast holes, under the action of gravity, the stemming easily enters the blast holes, and the blast holes are easily filled; however, for horizontal blast holes or inclined upward blast holes, the conventional blast hole plugging technology has the defects that the blast hole wall is irregular and not smooth, the stemming is easily blocked and damaged by a middle projection in the process of plugging, the stemming cannot be sent to a specified position, the inside of the stemming is hollow, the plugging is not in place, and the blasting effect is seriously influenced. In addition, the method for plugging the blast hole usually needs a certain time to ensure that the consolidation of the plug reaches a certain strength, the plugging effect is influenced by factors such as the property of the plugging material, the consolidation time and the operation mode, and the plugging is one-time plugging, so that the material consumption is serious and waste pollution is easy to generate. Therefore, there is a need to develop a mechanical, simple to operate, reusable, self-sealing orifice detent device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a mechanical type, leakproofness are good, the drill way blocks up firmly, easy operation, repeatedly usable self sealing type drill way screens device is provided.

And simultaneously, the utility model provides a construction method of self-sealing type drill way screens device.

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

a self-sealing orifice clamping device comprises a self-sealing member and an orifice clamping member;

the orifice clamping component comprises a cylindrical hollow cylinder, a top plate of the hollow cylinder is provided with a first through hole, and an external rotating block is rotationally connected in the first through hole;

the bottom end of the external rotating block is provided with a threaded hole penetrating into the external rotating block, and a pushing rod is connected with the threaded hole in a threaded manner;

the pushing rod comprises a threaded part in threaded connection with the threaded hole, a conical expansion part integrally connected with the threaded part and a long straight rod part integrally connected with the conical expansion part;

second through holes are symmetrically formed in the side wall of the hollow cylinder, wall grabbing claws are movably arranged in the second through holes and comprise inner ends which are positioned in the hollow cylinder and are in contact with the pushing rod and toothed wall grabbing surfaces which are positioned outside the hollow cylinder and are used for clamping the wall of the gun hole;

the outer wall of the wall grabbing claw is connected with the outer wall of the hollow cylinder through an elastic element;

a third through hole is formed in the bottom plate of the hollow cylinder, and the long straight rod part penetrates through the third through hole and is fixedly connected with the support plate of the self-sealing member;

the opposite surfaces of the bottom plate and the support plate respectively extend to the opposite surfaces of the bottom plate and the support plate to form annular convex edges, and an elastic rod is arranged between the two annular convex edges;

the elastic rod is internally provided with a through hole used for penetrating through the long straight rod part, the elastic rod is in interference fit with the long straight rod part, the upper end and the lower end of the elastic rod are matched with the annular convex edge, and the diameter of the middle part of the elastic rod is larger than that of the inner wall of the annular convex edge.

The diameter of the conical enlarged part is gradually increased from the threaded part to the long straight rod part.

The inner end is arc-shaped and is matched with the conical expansion part.

The tooth-shaped wall grabbing surface comprises a plurality of metal teeth.

The external rotating block is rotatably connected in the first through hole through a bearing.

And a spanner is arranged at the top of the external rotating block.

The threaded portion and the conical expansion portion are both located in the hollow cylinder.

The elastic element comprises a spring.

The elastic rod comprises a cowhells rod; the outer surface of the elastic rod is provided with a plurality of anti-rotation textures.

A construction method of a self-sealing type orifice clamping device comprises the following steps:

the method comprises the following steps: placing the self-sealing orifice clamping device into a blast hole, extending a wall grabbing claw into the blast hole, and leaving a wrench outside the blast hole;

step two: the wrench is rotated, the wrench drives the pushing rod to move forwards, the supporting plate of the self-sealing member connected with the pushing rod moves forwards and compresses the elastic rod, and the elastic rod transversely expands to be the same as the diameter of the blast hole;

step three: continuing to rotate the wrench, continuing to move the pushing rod forwards, and continuing to extend the wall grabbing claw outwards until the outer diameter of the wall grabbing claw reaches the same as that of the expanded elastic rod;

step four: at the moment, the wrench continues to rotate until the wall grabbing claw is inserted into the wall of the gun hole and has certain pressure, the wrench stops rotating, the clamping sealing operation is completed, and blasting is started;

step five: after blasting, the wrench is rotated reversely, the wall-grabbing claw is loosened, the elastic rod is slowly restored to the original state, the self-sealing type orifice clamping device is taken out from the blast hole, and the operation is finished.

The utility model has the advantages that:

1. the utility model discloses a from canned type drill way screens device grabs the wall claw through releasing, and the card goes into big gun pore wall, realizes drill way mechanical blockage, makes its lateral expansion realize sealedly through the compression cowhells stick.

2. The utility model discloses a self-sealing type drill way screens device relies on the friction of grabbing wall claw and big gun pore wall to carry out the screens, is applicable to all kinds of rock mass blasting big gun holes, is applicable to explosive blasting and various high energy gas fracturing, only needs to rotate the spanner and reaches required pressure, easy operation.

3. The utility model discloses a self-sealing type drill way screens device utilizes the ox muscle stick as sealing device, guarantees that high-pressure gas seals does not leak, and gas seal is effectual.

4. The utility model discloses a self-sealing type drill way screens device utilizes mechanical type drill way screens, and the sealed jam of cowhells stick does not need other chemical material to participate in, can realize that the screens is sealed, and safety ring protects, and the pollution-free remains, and does not need the time difference, can explode behind the screens, saves time.

5. The utility model discloses a from canned type drill way screens device utilizes and grabs wall claw and ox muscle stick and realizes that the screens is sealed, has and grabs wall claw and ox muscle stick recovery process, but reuse, economical and practical.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic structural view of the outer rotating block of the present invention;

FIG. 4 is a schematic structural view of the hollow cylinder of the present invention;

fig. 5 is a schematic structural view of the push rod of the present invention.

Detailed Description

The present invention is described in detail with reference to the accompanying drawings and specific embodiments, wherein the three-dimensional independent loading novel mixed boundary true triaxial apparatus is described in further detail.

Example 1:

as shown in fig. 1 and 2, a self-sealing orifice locking device includes a self-sealing member and an orifice locking member; the aperture detent member comprises a cylindrical hollow barrel 3.

As shown in figure 4, the hollow cylinder 3 is enclosed by a top plate, a bottom plate 8 and a side wall, and consists of three parts, namely an internal conical pushing rod 7 and an external rotating block 2, the side wall of the cylindrical hollow cylinder 3 extends out of the wall grabbing claw 4, the top of the hollow cylinder 3 is movably connected with the external rotating block 2, and the bottom of the hollow cylinder 3 is connected with a self-sealing member.

As shown in FIG. 3, the external rotation block 2 passes through the top plate of the cylindrical hollow cylinder 3 and is movable, a threaded hole 12 is formed in the center of the bottom of the external rotation block 2 and extends into the inside, and a wrench 1 is arranged at the top of the external rotation block 2 and extends for rotation.

Preferably, a first through hole is formed in a top plate of the hollow cylinder 3, and an external rotating block 2 is rotatably connected to the first through hole through a bearing.

As shown in fig. 5, the wall grabbing claw 4 is flexible, the inner end 15 of the wall grabbing claw 4 is arc-shaped and contacts with the conical pushing rod 7, two outer sides of the wall grabbing claw 4 are connected with the side wall of the hollow cylinder 3 through elastic elements 5, the elastic elements 5 are preferably springs, and the outer top end of the wall grabbing claw 4 is a tooth-shaped wall grabbing surface 16; the lower portion of the pushing rod 7 is a long straight rod portion 9, the long straight rod portion 9 is connected with a support plate 10 of a self-sealing component, the long straight rod portion 9 penetrates through a cylindrical elastic rod 11 with a hole upwards, the elastic rod 11 is preferably made of cowhells, the long straight rod portion 9 is further upwards provided with a conical expansion portion 14, the conical expansion portion 14 is further upwards provided with a threaded portion 13, the threaded portion 13 extends into a threaded hole 12 of the external rotating block 2, and the conical expansion portion 14 is in contact with the wall grabbing claw 4 to push the wall grabbing claw upwards and downwards.

The self-sealing member comprises a cylindrical elastic rod 11, a bottom plate 8 of the hollow cylinder 3 serves as a top extrusion plate of the self-sealing member, a support plate 10 serves as a bottom extrusion plate of the self-sealing member, and a long straight rod part 9 penetrates through the bottom plate 8 and is connected with the support plate 10.

The self-sealing orifice clamping device is clamped into the wall of a gun hole by pushing out the wall grabbing claws 4, so that the orifice is mechanically blocked, and the orifice is transversely expanded by compressing the elastic rod 11 to realize sealing.

The self-sealing type orifice clamping device needs to be calculated and subjected to field experiments according to the diameter of a field blast hole and the material of the wall of the blast hole, the relation between the movement distance required by the wall grabbing claw 4 and the compression distance required by the elastic rod 11 when the blast hole is sealed and the clamping device is firmly clamped is obtained, before the self-sealing type orifice clamping device is used, the diameter of the cylindrical barrel 3 is selected according to the diameter of the blast hole, and the length of the elastic rod 11, the position of the conical large part 14, the length of the threaded part 13 and the like are determined according to the relation between the movement distance required by the wall grabbing claw 4 and the compression distance required by the elastic rod 11.

The hollow cylinder 3 is a cavity metal cylinder and is used for connecting the external rotating block 2, the self-sealing member, the wall grabbing claw 4 and the pushing rod 7, providing a contact space for the wall grabbing claw 4 and the pushing rod 7, providing a base for the wall grabbing claw 4 to be convenient for stretching, and enabling the external rotating block 2 and the pushing rod 7 to be in coordination on the same straight line when the front and back movement is convenient.

The top end of the external rotating block 2 is welded with the wrench 1, the wrench 1 extends out of the blast hole, the wrench 1 is manually or mechanically rotated to rotate, and then the pushing rod 7 is driven to move back and forth through the rotating thread.

Further, the upper portion of the pushing rod 7 is a straight thread, namely the thread portion 13 is matched with the external rotating block 2, when the pushing rod 7 is driven by the external rotating block 2 to move back and forth through the thread, the conical expansion portion 14 in the middle is in contact with the wall grabbing claw 4, the diameter of the contact portion of the conical expansion portion 14 is changed, the diameter of the contact portion of the conical expansion portion and the wall grabbing claw 4 is changed, the wall grabbing claw 4 is further pushed to move up and down, meanwhile, the pushing rod 7 drives the support plate 10 to move back and forth, and the elastic rod 11 between the self-sealing members is enabled to deform.

Furthermore, the wall grabbing claw 4 is cast by a metal material, the bottom of the wall grabbing claw is arc-shaped and is matched with the conical expansion part 14 of the pushing rod 7, the top of the wall grabbing claw 4 is provided with a plurality of fine sharp metal teeth, when the pushing rod 7 moves forwards, the conical expansion part 14 is contacted with the bottom arc of the wall grabbing claw 4, and then the wall grabbing claw 4 is pushed to move upwards until the metal teeth at the top of the wall grabbing claw 4 are clamped on the wall of the gun hole; the elastic elements 5 are connected to the two outer sides of the wall grabbing claw 4, the elastic elements 5 are preferably spring strips, the spring is in a natural state before the wall grabbing claw 4 is not pushed out, after the wall grabbing claw 4 is pushed out, the spring is stretched, the wall grabbing claw 4 is pulled downwards (towards the hollow cylinder 3), and when the pushing rod 7 retracts and the contact diameter of the conical expansion part 14 and the bottom arc of the wall grabbing claw 4 is reduced, the wall grabbing claw 4 is pulled back to the original position by the spring.

Further, 8 fixed immobilizess of bottom plate of hollow section of

thick bamboo

3, 8 centers of bottom plate pass propelling movement stick 7 and with the long straight pole portion 9 swing joint of propelling movement stick 7, from the inside cowhells stick that is of seal member, the cowhells stick has certain elasticity, extension board 10 with long straight pole portion 9 welding and follow long straight pole portion 9 seesaw together, when extension board 10 forward motion, the extrusion cowhells stick makes its horizontal deformation, reach sealed requirement until hugging closely the big gun hole wall, the cowhells stick atress relaxes the self recovery original state when extension board 10 backward motion.

Further, the ox muscle stick center has the cylinder hollow that link up, and the long straight rod portion 9 of 7 lower parts of propelling movement stick is worn out from the cylinder hollow to be connected on extension board 10, rotate spanner 1, when making outside turning block 2 drive propelling movement stick 7 forward motion, extension board 10 is driven forward motion, and the distance between the upper and lower stripper plate reduces, and the ox muscle stick receives the extrusion protruding to the side inflation, and extension board 10 forward motion distance is longer more, and the protruding thicker of ox muscle stick, and it is longer to grab the outside distance of releasing of wall claw 4 simultaneously. After the support plate 10 moves forward for a certain distance, at this moment, the wall grabbing claw 4 tightly grabs the gun hole wall, and the cowhells stick protrusion compresses tightly the gun hole wall simultaneously, thereby realizing screens and self-sealing. After the operation is finished, the wrench 1 is reversely rotated, the pushing rod 7 is pushed backwards, the wall grabbing claw 4 and the cowhells rod can be released, and therefore the self-sealing type orifice clamping device is dismounted, and recycling is achieved.

Furthermore, the opposite surfaces of the bottom plate 8 and the support plate 10 respectively extend towards the opposite surfaces thereof with annular convex edges, and an elastic rod 11 is arranged between the two annular convex edges; elastic rod 11 with interference fit between the long straight rod portion 9, interference fit's setting can prevent that the cowhells stick from taking place rotatoryly, elastic rod 11's surface is provided with a plurality of textures of preventing changeing, prevents changeing the preferred a plurality of oblique stripes of texture, prevents changeing the setting of texture, further prevents that the cowhells stick from taking place rotatoryly to realize the fore-and-aft motion of cowhells stick.

Example 2:

according to the diameter of a field blast hole and the material of the wall of the blast hole, calculation and field experiments are carried out, for example, the diameter of the blast hole is 110mm, the material of the wall of the blast hole is granite, and then the diameter of a hollow cylinder 3, the length of a tendon rod, the position of a conical expansion part 14, the telescopic distance of a wall grabbing claw 4, the length of a thread part 13 and the like are selected according to the conditions, in this example, the hollow cylinder 3 with the diameter of 100mm, the in-situ diameter of the wall grabbing claw 4 is 104mm, the maximum extension diameter is 118mm, and the undisturbed diameter of the tendon rod is 100mm, and the specific using method comprises the following steps:

the method comprises the following steps: placing the self-sealing type orifice clamping device into a blast hole, partially extending the wall grabbing claw 4 into the blast hole, and leaving the wrench 1 outside the blast hole;

step two: the wrench 1 is rotated, the wrench 1 drives the pushing rod 7 to move forwards, the long straight rod part 9 of the pushing rod 7 is connected with the support plate 10 of the self-sealing member to move forwards, the tendon bar is compressed, and the tendon bar is transversely deformed;

step three: the diameter of the beef tendon rod reaches 110mm when the beef tendon rod is compressed forwards by 20mm, and the outer diameter of the wall grabbing claw 4 is 108 mm;

step four: the wrench 1 is rotated, and when the pushing rod 7 continues to move forwards, the wall grabbing claw 4 continues to extend outwards until the outer diameter reaches 110 mm;

step five: at the moment, the wrench 1 is continuously rotated, the wall grabbing claw 4 is inserted into the wall of the gun hole and has certain pressure, the wrench 1 is stopped rotating, meanwhile, the tendon rod between the self-sealing members is transversely restrained, the tendon rod does not change after the outer diameter reaches 110mm, the area of the part reaching the diameter is enlarged, the sealing effect reaches the best state, the clamping sealing operation is finished, and the blasting is started;

step six: after the blasting is finished, the wrench 1 is rotated reversely, the wall grabbing claw 4 is loosened, the tendon rod is slowly restored to the original state, the self-sealing type orifice clamping device is taken out, and the operation is finished.

Through the steps, the mechanical self-sealing type orifice clamping device is adopted, an ideal blast hole clamping and sealing effect is achieved, the operation is simple, the repeated utilization is realized, no pollution waste is generated, the mechanical self-sealing type orifice clamping device is suitable for the orifice plugging operation of explosive blasting or high-energy gas fracturing in various stratums, and the mechanical self-sealing type orifice clamping device is suitable for small blast hole plugging in a laboratory.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: rather, the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A self-sealing orifice clamping device is characterized by comprising a self-sealing member and an orifice clamping member;

the orifice clamping component comprises a cylindrical hollow cylinder (3), a top plate of the hollow cylinder (3) is provided with a first through hole, and an external rotating block (2) is rotationally connected in the first through hole;

the bottom end of the external rotating block (2) is provided with a threaded hole (12) penetrating into the external rotating block, and a pushing rod (7) is connected with the threaded hole (12) in an internal thread manner;

the pushing rod (7) comprises a threaded part (13) in threaded connection with the threaded hole (12), a conical expansion part (14) integrally connected with the threaded part (13), and a long straight rod part (9) integrally connected with the conical expansion part (14);

second through holes are symmetrically formed in the side wall of the hollow cylinder (3), wall grabbing claws (4) are movably arranged in the second through holes, and each wall grabbing claw (4) comprises an inner end (15) which is positioned in the hollow cylinder (3) and is in contact with the pushing rod (7) and a toothed wall grabbing surface (16) which is positioned outside the hollow cylinder (3) and is used for tightly clamping the wall of the gun hole;

the outer wall of the wall grabbing claw (4) is connected with the outer wall of the hollow cylinder (3) through an elastic element (5);

a third through hole is formed in a bottom plate (8) of the hollow cylinder (3), and the long straight rod part (9) penetrates through the third through hole and is fixedly connected with a support plate (10) of the self-sealing member;

the opposite surfaces of the bottom plate (8) and the support plate (10) extend to the opposite surfaces respectively to form annular convex edges, and an elastic rod (11) is arranged between the two annular convex edges;

the elastic rod (11) is internally provided with a through hole used for penetrating through the long straight rod part (9), the elastic rod (11) is in interference fit with the long straight rod part (9), the upper end and the lower end of the elastic rod (11) are matched with the annular convex edge, and the diameter of the middle part of the elastic rod (11) is larger than the diameter of the inner wall of the annular convex edge.

2. The self-sealing orifice detent device of claim 1, wherein the diameter of the conical enlarged portion (14) gradually increases from the threaded portion (13) to the long straight rod portion (9).

3. A self-sealing orifice locking device according to claim 1, characterized in that said inner tip (15) is arc-shaped and fits with said conical enlargement (14).

4. The self-sealing orifice detent device of claim 1, wherein the toothed catch surface (16) comprises a plurality of metal teeth.

5. The self-sealing orifice locking device according to claim 1, characterized in that said external rotating block (2) is rotatably connected in said first through hole by means of a bearing.

6. Self-sealing orifice blocking device according to claim 1, characterized in that a spanner (1) is arranged on top of said external turning block (2).

7. A self-sealing orifice blocking device according to claim 1, characterized in that said threaded portion (13) and said conical enlargement (14) are both located inside said hollow cylinder (3).

8. Self-sealing orifice blocking device according to claim 7, characterized in that said elastic element (5) comprises a spring.

9. The self-sealing orifice snap-in device according to claim 1, characterized in that said elastic bar (11) comprises a cowhells bar; the outer surface of the elastic rod (11) is provided with a plurality of anti-rotation textures.