阅读说明：本技术 一种双向密封圈 (Bidirectional sealing ring ) 是由 唐文阁 彭志远 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种双向密封圈,包括连接环,所述连接环的环形外表面设置有转动环,所述转动环靠近连接环的环形外表面固定连接有滑块,所述连接环与滑块对应位置开设有第一滑槽,所述连接环靠近转动环的环形外表面开设有推槽,所述推槽内部活动连接有推杆,所述推杆靠近转动环的一侧外表面开设有螺纹槽,所述螺纹槽内部螺纹连接有螺纹杆,所述转动环靠近推槽位置开设有齿槽,所述连接环的上端外表面开设有对接口,所述连接环的中间位置开设有通口,所述通口的内表面一侧位置套接有内密封圈,所述对接口远内表面另一侧位置设置有外密封圈,通过一系列结构使得推杆在提高外密封圈密封性的同时提高与管道连接的稳定性。(The invention discloses a bidirectional sealing ring, which comprises a connecting ring, wherein a rotating ring is arranged on the annular outer surface of the connecting ring, the annular outer surface of the rotating ring close to the connecting ring is fixedly connected with a sliding block, a first sliding groove is arranged at the position of the connecting ring corresponding to the sliding block, a push groove is arranged on the annular outer surface of the connecting ring close to the rotating ring, a push rod is movably connected inside the push groove, the outer surface of one side of the push rod close to the rotating ring is provided with a thread groove, the inner part of the thread groove is connected with a threaded rod in a threaded manner, the rotating ring is provided with a tooth socket close to the pushing groove, the outer surface of the upper end of the connecting ring is provided with a butt joint port, a through hole is arranged in the middle of the connecting ring, an inner sealing ring is sleeved at one side of the inner surface of the through hole, an outer sealing ring is arranged at the other side of the far inner surface of the butt joint hole, through a series of structures, the push rod improves the sealing performance of the outer sealing ring and improves the stability of connection with the pipeline.)

1. A two-way sealing ring comprises a connecting ring (1), and is characterized in that: the connecting ring is characterized in that a rotating ring (2) is arranged on the annular outer surface of the connecting ring (1), a sliding block (26) is fixedly connected to the annular outer surface of the rotating ring (2) close to the connecting ring (1), a first sliding groove (11) is formed in the corresponding position of the connecting ring (1) and the sliding block (26), a pushing groove (23) is formed in the annular outer surface of the connecting ring (1) close to the rotating ring (2), a push rod (22) is movably connected to the inside of the pushing groove (23), a thread groove (25) is formed in the outer surface of one side, close to the rotating ring (2), of the push rod (22), a threaded rod (24) is connected to the inside of the thread groove (25) in a threaded manner, a tooth groove (21) is formed in the position of the rotating ring (2) close to the pushing groove (23), butt-joint ports (6) are formed in the outer surfaces of the upper end and the lower end of the connecting ring (1), and a through port (5) is formed in the middle position of the connecting ring (1), an inner sealing ring (4) is sleeved at one side of the inner surface, close to the through hole (5), of the butt joint port (6), an outer sealing ring (3) is arranged at one side of the inner surface, far away from the through hole (5), of the butt joint port (6), a telescopic groove (27) is formed in the outer surface of the upper end of the push rod (22), a telescopic block (29) is movably connected inside the telescopic groove (27), and a telescopic spring (28) is fixedly connected between the telescopic block (29) and the telescopic groove (27);

the connecting ring (1) and the rotating ring (2) are made of metal materials;

a first ball is arranged on one side of the threaded rod (24) far away from the push rod (22) in a rolling mode.

2. The bi-directional seal ring of claim 1, wherein: the sliding block (26) is located inside the first sliding groove (11), the sliding block (26) is in sliding connection with the first sliding groove (11) and is matched with the first sliding groove, and the rotating ring (2) is movably connected with the connecting ring (1) through the sliding block (26) and the first sliding groove (11).

3. The two-way sealing ring according to claim 1, characterized in that the threaded rod (24) is designed to be T-shaped, the annular outer surface of the threaded rod (24) is fixedly connected with teeth near the tooth sockets (21), the teeth are engaged with the tooth sockets (21), and the threaded rod (24) and the thread grooves (25) are movably connected with the tooth sockets (21) through the teeth.

4. The bi-directional seal ring of claim 1, wherein: the push rod (22) is integrally designed to be of a T-shaped structure, the longitudinal section of the push rod is designed to be of a rectangular structure, and the push rod (22) and the push groove (23) are movably connected with the thread groove (25) through a threaded rod (24).

5. The bi-directional seal ring of claim 1, wherein: a threaded hole is formed in the upper portion of the sliding block (26), and a bolt is connected to the inner portion of the threaded hole in a threaded mode.

6. The bi-directional seal ring of claim 1, wherein: the outer sealing ring (3) is formed by winding a sealing strip (71), a second sliding groove 72 is formed in the connecting ring (1), and the outer end of the sealing strip (71) penetrates through the second sliding groove (72) to be fixedly connected with the rotating ring (2).

7. The bi-directional seal ring of claim 6, wherein: one side of the sealing strip (71) far away from the center of the rotating ring (2) is provided with a strip-shaped protrusion (73) along the length direction of the sealing strip (71), one side of the sealing strip (71) close to the center of the rotating ring (2) is provided with a first strip-shaped groove (74) along the length direction of the sealing strip (71), and the strip-shaped protrusion (73) is matched in the first strip-shaped groove (74).

8. The bi-directional seal ring of claim 6, wherein: one side that sealing strip (71) inner is close to swivel becket (2) center is equipped with a plurality of second bar grooves (75), and a plurality of second bar grooves (75) extend along sealing strip (71) width direction, and second bar groove (75) length is less than sealing strip (71) width.

9. A bi-directional seal ring according to claim 6, 7 or 8, wherein: one side of the push rod (22) close to the outer sealing ring (3) is provided with a second ball (76) in a rolling mode, and the second ball (76) abuts against the outer peripheral wall of the outer sealing ring (3).

Technical Field

The invention relates to the technical field of sealing assemblies, in particular to a bidirectional sealing ring.

Background

The sealing ring is an annular structure used between the liquid pipeline connecting pieces, the sealing ring has the function of keeping the sealing performance of the connecting pieces, the sealing ring has good sealing performance within a working pressure and a certain temperature range, and the sealing performance can be automatically improved along with the increase of the pressure.

The invention discloses a quick-mounting type two-way sealing ring which comprises a body, wherein an outer ring is fixedly arranged outside the body, an inner ring is fixedly arranged inside the body, the heights of the upper end and the lower end of the outer ring and the upper end and the lower end of the inner ring are the same, a through hole is fixedly arranged inside the inner ring, a first mounting groove is fixedly arranged between the outer ring and the inner ring at the upper end of the body, and a second mounting groove is fixedly arranged between the outer ring and the inner ring at the lower end of the body. This ready-package two-way sealing washer is provided with two sets of adapting unit of first mounting groove and second mounting groove, can seal the junction of two sets of connecting pieces of interconnect, and then has improved the leakproofness of this sealing washer greatly, sets up certain angle through the side of the bottom that sets up first mounting groove and second mounting groove simultaneously, sets up the angle at the upper and lower both ends of inner circle simultaneously, can make the connecting piece can be easily inserted and close, and then improved the installation rate.

In the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved: 1. when the two-way sealing ring is connected with two groups of pipelines, because a user directly inserts the pipelines into the mounting grooves of the sealing rings, the pipelines can be separated from the sealing rings when the pipelines are impacted by larger water flow, and the situation of poor sealing performance occurs; 2. the sealing washer self has elasticity for it is too troublesome when changing the sealing washer, and the position of installation also is difficult for holding, if can not accurate installation, can make sealing performance descend.

Therefore, a bidirectional sealing ring is provided.

Disclosure of Invention

The present invention is directed to a two-way sealing ring to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: a bidirectional sealing ring comprises a connecting ring, wherein a rotating ring is arranged on the annular outer surface of the connecting ring, a sliding block is fixedly connected to the annular outer surface of the rotating ring, which is close to the connecting ring, a first sliding groove is formed in the position, corresponding to the sliding block, of the connecting ring, a pushing groove is formed in the connecting ring, which is close to the annular outer surface of the rotating ring, a push rod is movably connected in the pushing groove, a thread groove is formed in the outer surface of one side, which is close to the rotating ring, of the push rod, a threaded rod is connected in a threaded groove in a threaded manner, a tooth groove is formed in the position, which is close to the pushing groove, of the rotating ring, a butt joint is formed in the outer surface of the upper end of the connecting ring, a through hole is formed in the middle position of the connecting ring, an inner sealing ring is sleeved at one side of the inner surface of the butt joint, which is close to the through hole, an outer sealing ring is arranged at one side of the inner surface, which is far away from the through hole, a telescopic groove is formed in the outer surface of the upper end of the push rod, the telescopic groove is movably connected with a telescopic block, and a telescopic spring is fixedly connected between the telescopic block and the telescopic groove.

Through adopting above-mentioned technical scheme, insert two sets of pipelines to the interface, the rotating ring passes through the slider and rotates along first spout, the tooth's socket that inside was seted up and threaded rod fixed surface's tooth mesh mutually, the threaded rod rotates along with the pivoted rotating ring, the threaded rod pushes away the push rod to the interface through the screw thread along pushing away the groove, external seal circle and push rod contact, the sealing washer further increases its leakproofness with pipeline zonulae occludens under the promotion of push rod this moment, when needing to change the sealing washer, can stir flexible piece along flexible groove upward movement, take off the sealing washer and change.

Preferably, the sliding block is located inside the first sliding groove, the sliding block and the first sliding groove are in sliding connection and are matched with each other correspondingly, and the rotating ring is movably connected with the connecting ring through the sliding block and the first sliding groove.

Through adopting above-mentioned technical scheme, make the swivel becket rotate along the go-between under the direction of slider and first spout.

Preferably, the threaded rod is designed to be of a T-shaped structure, teeth are fixedly connected to the position, close to the tooth grooves, of the annular outer surface of the threaded rod, the teeth are meshed with the tooth grooves, and the threaded rod is movably connected with the tooth grooves through the teeth.

Through adopting above-mentioned technical scheme, rotate the rotating ring, the tooth's socket is connected with the tooth meshing of threaded rod and is made the threaded rod rotate along with it.

Preferably, the push rod is integrally designed to be of a T-shaped structure, the longitudinal section of the push rod is designed to be of a rectangular structure, and the push rod and the push groove are movably connected through a threaded rod and a threaded groove.

Through adopting above-mentioned technical scheme, the push rod makes the push rod can not follow the rotation of threaded rod and rotate for the rectangular structure design, makes it can only move along pushing away the groove.

Preferably, a threaded hole is formed in the upper portion of the sliding block, and a bolt is connected to the inner portion of the threaded hole in a threaded mode.

Through adopting above-mentioned technical scheme, can resist the rotating ring through bolt and screw hole, make it fixed.

Preferably, the outer sealing ring is formed by winding a sealing strip, the connecting ring is provided with a second sliding groove, and the outer end of the sealing strip penetrates through the second sliding groove to be fixedly connected with the rotating ring.

Preferably, one side of the sealing strip, which is far away from the center of the rotating ring, is provided with a strip-shaped bulge along the length direction of the sealing strip, one side of the sealing strip, which is close to the center of the rotating ring, is provided with a first strip-shaped groove along the length direction of the sealing strip, and the strip-shaped bulge is matched in the first strip-shaped groove.

Preferably, one side that the sealing strip is inner to be close to the swivel ring center is equipped with a plurality of second bar grooves, and a plurality of second bar grooves extend along sealing strip width direction, and second bar groove length is less than the sealing strip width.

Preferably, one side of the push rod close to the sealing ring is provided with a second ball in a rolling mode, and the second ball abuts against the outer peripheral wall of the sealing ring.

Compared with the prior art, the invention has the beneficial effects that:

1. the first sliding groove is formed in the annular outer surface of the connecting pipe, the sliding block is connected inside the first sliding groove in a sliding mode, the sliding block is fixedly connected with the rotating ring, the rotating ring rotates along the first sliding groove through the sliding block, the tooth grooves are formed in the outer surface, close to the connecting ring, of one side of the rotating ring, the connecting ring corresponds to the tooth grooves, the pushing grooves are formed in the connecting ring, the pushing grooves are movably connected inside the pushing grooves and are connected with the push rod, the push rod is in threaded connection with the threaded rod, the tooth grooves drive the threaded rod to rotate when the rotating ring rotates along the first sliding groove, the push rod is pushed out along the pushing grooves by the rotating threaded rod, the outer sealing ring in contact with the push rod can be resisted towards the butt joint piece, the sealing effect can be further improved through the structure, and the butt joint pipeline is enabled to be fastened more.

2. Through seting up flexible groove at the upper end surface of push rod, flexible inslot swing joint flexible piece, the outer seal circle centre gripping in the centre will be placed to the flexible piece of I shape structure under expanding spring's the traction is fixed, when needs are changed, stirs flexible piece after with, makes it lose the convenient sealing washer of taking off of contact with the outer seal circle, makes the dismantlement and the installation of outer seal circle comparatively convenient through this structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an overall structural view of the present invention;

FIG. 2 is a combination view of the connector ring and port of the present invention;

FIG. 3 is a combined view of the rotating ring and the connecting ring of the present invention;

FIG. 4 is an assembled view of the push rod and threaded rod of the present invention;

FIG. 5 is a view of the push rod and telescoping block combination of the present invention;

FIG. 6 is an assembled view of the connector ring and port of the present invention;

FIG. 7 is an assembled view of the push rod and threaded rod of the present invention;

FIG. 8 is a schematic view of an outer seal ring of the present invention;

fig. 9 is a schematic view of an outer seal ring of the present invention.

Description of reference numerals:

1. a connecting ring; 11. a first chute; 2. a rotating ring; 21. a tooth socket; 22. a push rod; 23. pushing the groove; 24. a threaded rod; 25. a thread groove; 26. a slider; 27. a telescopic groove; 28. a tension spring; 29. a telescopic block; 3. an outer sealing ring; 4. an inner seal ring; 5. a port; 6. a butt joint port; 71. a sealing strip; 72. a second chute; 73. a strip-shaped bulge; 74. a first bar-shaped groove; 75. a second strip groove; 76. a second ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, the present invention provides a technical solution:

as shown in fig. 1 to 5, a two-way sealing ring includes a connecting ring 1, a rotating ring 2 is disposed on an annular outer surface of the connecting ring 1, and both the connecting ring 1 and the rotating ring 2 are made of a metal material, such as a copper material. The annular outer surface of the rotating ring 2 close to the connecting ring 1 is fixedly connected with a sliding block 26, the connecting ring 1 and the sliding block 26 are provided with a first sliding groove 11 at a position corresponding to the sliding block 26, the annular outer surface of the connecting ring 1 close to the rotating ring 2 is provided with a push groove 23, the push groove 23 is internally and movably connected with a push rod 22, the outer surface of one side of the push rod 22 close to the rotating ring 2 is provided with a thread groove 25, the inside of the thread groove 25 is in threaded connection with a threaded rod 24, one side of the threaded rod 24 far away from the push rod 22 is provided with a first ball in a rolling manner, the position of the rotating ring 2 close to the push groove 23 is provided with a tooth groove 21, the outer surface of the upper end of the connecting ring 1 is provided with a butt joint 6, the middle position of the connecting ring 1 is provided with a through hole 5, the position of the butt joint 6 close to one side of the inner surface of the through hole 5 is sleeved with an inner sealing ring 4, and the position of the butt joint 6 far away from one side of the inner surface of the through hole 5 is provided with an outer sealing ring 3, the outer surface of the upper end of the push rod 22 is provided with a telescopic groove 27, the inside of the telescopic groove 27 is movably connected with a telescopic block 29, a telescopic spring 28 is fixedly connected between the telescopic block 29 and the telescopic groove 27, two groups of pipelines are inserted into the butt joint port 6, the rotating ring 2 rotates along the first sliding groove 11 through the sliding block 26, the tooth grooves 21 formed inside are meshed with teeth fixedly connected with the surface of the threaded rod 24, the threaded rod 24 rotates along with the rotating ring 2, the push rod 22 is pushed away to the butt joint port 6 through threads by the threaded rod 24, the outer sealing ring 3 is in contact with the push rod 22, the sealing ring is further in tight connection with the pipelines under the pushing of the push rod 22 to increase the sealing performance of the sealing ring, when the sealing ring needs to be replaced, the telescopic block 29 can be moved upwards along the telescopic groove 27, and the sealing ring can be taken down and replaced.

Specifically, the sliding block 26 is located inside the first sliding chute 11, the sliding block 26 is slidably connected with the first sliding chute 11 and correspondingly matched with each other, the rotating ring 2 is movably connected with the connecting ring 1 through the sliding block 26 and the first sliding chute 11, and the rotating ring 2 can rotate along the connecting ring 1 under the guidance of the sliding block 26 and the first sliding chute 11.

Specifically, threaded rod 24 is T shape structural design, the position fixedly connected with tooth that the annular surface of threaded rod 24 is close to tooth's socket 21, tooth and tooth's socket 21 meshing are connected, threaded rod 24 passes through tooth and tooth's socket 21 swing joint with thread groove 25, rotates swivel becket 2, and tooth's socket 21 is connected with the tooth meshing of threaded rod 24 and is made threaded rod 24 rotate thereupon.

Specifically, the push rod 22 is integrally designed to be of a T-shaped structure, the longitudinal section of the push rod is designed to be of a rectangular structure, the push rod 22 is movably connected with the threaded rod 24 through the threaded groove 25, and the push rod 22 is designed to be of a rectangular structure so that the push rod 22 cannot rotate along with the rotation of the threaded rod 24 and can only move along the push groove 23.

Specifically, a threaded hole is formed above the sliding block 26, a bolt is connected to the threaded hole through threads, and the rotating ring 2 can be resisted through the bolt and the threaded hole, so that the rotating ring can be fixed.

Specifically, the telescopic block 29 is in an i-shaped structural design, the outer sealing ring 3 is in contact with the outer surface of the push rod 22 on the side away from the threaded rod 24, and the telescopic block 29 clamps and resists the outer sealing ring 3 under the tensile force of the telescopic spring 28, so that the installation and replacement of the sealing ring are facilitated.

The working principle is as follows: the first sliding groove 11 is formed in the annular outer surface of the connecting pipe, the sliding block 26 is connected in the first sliding groove 11 in a sliding manner, the sliding block 26 is fixedly connected with the rotating ring 2, the rotating ring 2 rotates along the first sliding groove 11 through the sliding block 26, the tooth groove 21 is formed in the outer surface of one side, close to the connecting ring 1, of the rotating ring 2, the push groove 23 is formed in the position, corresponding to the tooth groove 21, of the connecting ring 1, the push rod 22 is movably connected in the push groove 23, the push rod 22 is in threaded connection with the threaded rod 24, when the rotating ring 2 rotates along the first sliding groove 11, rolling friction is generated between the rotating ring 2 and the first ball, the phenomenon that the rotating ring 2 is difficult to rotate due to the sliding friction between the rotating ring and the threaded rod 24 is avoided, the rotating ring 2 drives the tooth groove 21 to rotate, the tooth groove 21 drives the threaded rod 24 to rotate, the rotating threaded rod 24 pushes the push rod 22 out along the push groove 23, and the outer sealing ring 3 in contact with the push rod 22 can be resisted against the butting piece, can further improve sealed effect through this structure, and make the pipeline of butt joint more firm, through set up flexible groove 27 at the upper end surface of push rod 22, flexible groove 27 inside swing joint telescopic block 29, the outer seal ring 3 centre gripping that will place under telescopic spring 28 pulls of telescopic block 29 of I shape structure is fixed, when needs are changed, stir telescopic block 29 after using, make it lose the convenient sealing washer of taking off of contact with outer seal ring 3, it is comparatively convenient to make the dismantlement and the installation of outer seal ring 3 through this structure.

The using method comprises the following steps: the user butt joints two groups of pipelines in butt joints 6 at the upper end and the lower end of a connecting ring 1 respectively, the pipelines butt joint the two groups of pipelines in a sealing way through an inner sealing ring 4 and an outer sealing ring 3, at the moment, the user rotates a rotating ring 2, a tooth groove 21 in the rotating ring 2 is meshed with a threaded rod 24, the threaded rod 24 moves a push rod 22 in threaded connection towards the outer sealing ring 3 to resist the sealing ring so as to increase the sealing performance of the sealing ring and the pipelines, meanwhile, the stability of the connecting ring 1 and the pipelines can be increased, the connecting ring 1 can bear larger impact of water flow, the user resists the rotating ring 2 through a threaded hole by a bolt, the position of the rotating ring 2 is fixed, the rotating ring 2 is reversely rotated when the outer sealing ring 3 needs to be replaced, the push rod 22 retracts into a push groove 23, the user stirs a telescopic block 29 to be separated from contact with the outer sealing ring 3, and the damaged outer sealing ring 3 is taken down to be replaced by a new outer sealing ring 3, the hand that releases the toggle block 29 clamps the new outer sealing ring 3 under the tension of the telescopic spring 28.

Because the number of the push rods 22 is limited, the outer sealing ring 3 between any adjacent push rods 22 is not extruded by the push rods 22, and therefore the sealing between the local outer sealing ring 3 which is not extruded and the pipeline is not tight, in order to solve the problem, referring to fig. 6 to 9, the outer sealing ring 3 is designed to be formed by winding one sealing strip 71, in this embodiment, the sealing strip 71 is wound by three turns, the connecting ring 1 is provided with a second sliding groove 72, the outer end of the sealing strip 71 passes through the second sliding groove 72 to be detachably connected with the rotating ring 2, specifically, the inner peripheral wall of the rotating ring 2 is provided with a clamping groove, the outer end of the sealing strip 71 is provided with a clamping block, the clamping block can be matched in the clamping groove, so that the outer end of the sealing strip 71 is connected with the rotating ring 2, and the sealing strip 71 can slide in the second sliding groove 72. When the rotating ring 2 is rotated, the rotating ring 2 pulls the outer end of the weather strip 71, so that the weather strip 71 tightens the pipeline, and although the adjacent push rods 22 are not squeezed, the weather strip 71 gradually tightens, and the sealing performance between the weather strip 71 and the pipeline between the adjacent push rods 22 can also be improved. The innermost circumference of the sealing strip 71, the thickness of which is gradually reduced.

When the sealing strips 71 are pulled, the sealing strips 71 of adjacent circles can slide relatively, in order to ensure relative sliding, lubricating oil is filled between the sealing strips 71, one side of each sealing strip 71, which is far away from the center of the rotating ring 2, is provided with a strip-shaped protrusion 73 along the length direction of the sealing strip 71, one side of each sealing strip 71, which is close to the center of the rotating ring 2, is provided with a first strip-shaped groove 74 along the length direction of the sealing strip 71, the strip-shaped protrusions 73 are matched in the first strip-shaped grooves 74, and the strip-shaped protrusions 73 can slide in the first strip-shaped grooves 74 to guide the movement of the sealing strips 71.

When the outer end of the sealing strip 71 is pulled, if the inner end of the sealing strip 71 moves synchronously, the sealing strip 71 cannot be tightened, so that the inner end of the sealing strip 71 needs to be locked and fixed, a plurality of second strip-shaped grooves 75 are formed in one side, close to the center of the rotating ring 2, of the inner end of the sealing strip 71, the second strip-shaped grooves 75 extend in the width direction of the sealing strip 71, the friction force between the sealing strip 71 and a pipeline can be increased through the second strip-shaped grooves 75, and the inner end of the sealing strip 71 cannot move synchronously along with the outer end of the sealing strip 71 under the action of the friction force. And the length of the second strip-shaped groove 75 is smaller than the width of the sealing strip 71, preventing the liquid in the pipeline from leaking through the second strip-shaped groove 75.

Further, a second ball 76 is mounted on one side of the push rod 22 close to the outer sealing ring 3 in a rolling manner, and the second ball 76 abuts against the outer peripheral wall of the outer sealing ring 3. When the sealing strip 71 is pulled, the sealing strip 71 drives the second ball 76 to rotate, and relative to the fact that the sealing strip 71 is directly abutted against the push rod 22, the pulling of the sealing strip 71 is not greatly resisted by the push rod 22.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.