Sucking disc convenient to adjust

Abstract

The utility model discloses a suction cup convenient to adjust, which comprises a suction cup main body and a bearing piece, a connecting part is arranged on the suction cup main body, a protective cover is arranged between the suction cup main body and the bearing piece, the protective cover is provided with a protective cover through hole, the connecting part penetrates through the protective cover through hole to be connected with the bearing piece, and the protective cover is further provided with a first circular groove facing the suction cup main body. A circular truncated cone part is arranged on the suction cup body, the first circular groove is arranged on the circular truncated cone part in a sleeving mode and can rotate relative to the suction cup body, and the bearing piece limits the protection cover. According to the suction cup convenient to adjust, after the suction cup is adsorbed on a base surface, the protective cover can be rotated to adjust the direction of the hanging part on the protective cover to be in a vertical state, the risk that the suction cup body falls off due to uneven stress of the suction cup caused by inclination of the hanging part of the suction cup is reduced, and the service life of the suction cup is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of daily necessities, in particular to a suction cup convenient to adjust. BACKGROUND

[0002] Suction cups are often used in people's daily life, and are widely used because of their convenience, which only needs to be adsorbed on the base surface of the wall, object surface, etc. and does not need to drill the wall or drill hole. The suction cup is a household product fixed on the base surface by sticking to the base surface and forming a vacuum cavity in the middle, which is usually adsorbed on the wall surface, cabinet surface, etc. for hanging objects, and has the characteristics of convenient fixing and flexible displacement.

[0003] Most of the current suction cups are vacuum adsorption type structures, which are provided with a disc body with a bowl shape with a deep middle and a shallow periphery. The disc body is tightly attached to the base surface or the surface of the object, and the disc body is pressed to deform and attach to the base surface, and the air between the disc body and the base surface is discharged, so that the disc body is adsorbed on the base surface. In addition, the disc body is connected with an outer cover, and the outer cover includes a hanging part connected with an external hanging part, which can be a hook, a storage rack, a mop bucket, etc. to achieve the purpose of hanging and fixing. However, when the disc body is adsorbed on the base surface, due to the error of human operation, the adsorption direction of the disc body may be inclined, which causes the direction of the hanging part on the outer cover connected with the disc body to be in an inclined state instead of a vertical state. The inclined hanging part will cause uneven stress distribution of the suction cup under stress, thereby increasing the risk of disc body falling off, affecting the service life of the suction cup, and may also cause the external object to be placed at the predetermined position. In addition, the falling of the disc body may cause the external object to fall off accidentally, which not only may damage the object, but also may cause injury to the personnel. SUMMARY

[0004] The utility model aims to provide a suction cup convenient to adjust, which can adjust the direction of the hanging part on the protective cover to be in a vertical state by rotating the protective cover after the suction cup is adsorbed on the base surface, reduce the risk of disc body falling off caused by the uneven stress of the suction cup due to the inclination of the external object on the hanging part, and ensure the service life of the suction cup.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a convenient to adjust sucking disc, including sucking disc main part and the butt piece, be equipped with the connecting portion on the sucking disc main part, be equipped with the protection cover between the sucking disc main part and the butt piece, the protection cover is equipped with protection cover through -hole, the connecting portion passes through protection cover through -hole and is connected with the butt piece, still be equipped with the first circular groove of the protection cover to sucking disc main part, be equipped with the circular table portion on the sucking disc main part, the first circular groove is set on the circular table portion and can rotate relative to the sucking disc main part, the butt piece is positioned to protection cover.

[0007] Preferably, the connecting portion includes a rectangular protrusion, the top of the rectangular protrusion extends on both sides with a clamping edge, the butt piece is provided with a clamping protrusion, a support edge corresponding to the clamping edge is provided in the clamping protrusion, and the clamping edge and the support edge are clamped and matched to connect the sucking disc main body and the butt piece.

[0008] Preferably, the protection cover covers the sucking disc main body, the protection cover through-hole is arranged in the middle of the protection cover, the clamping protrusion on the butt piece passes through the protection cover through-hole and is connected with the rectangular protrusion, and the edge of the protection cover through-hole forms the first circular groove in the direction of the sucking disc main body.

[0009] Preferably, the protection cover is further provided with a second circular groove, the second circular groove is formed by the edge of the protection cover through-hole extending in the direction of the butt piece, the second circular groove is communicated with the first circular groove, and the butt piece is provided with a butt plate abutting against the edge of the second circular groove to limit the protection cover.

[0010] Preferably, the protection cover includes an annular wall, and the annular wall surrounds the sucking disc main body.

[0011] Preferably, the protection cover is further provided with a hanging part connected with an external article, and the hanging part is any one of a hook, a clamping groove or a screw.

[0012] Preferably, the top edge of the clamping edge is provided with a slope, the rectangular protrusion is provided with a through hole parallel to the extension direction of the clamping edge, and the rectangular protrusion is further provided with a blind hole perpendicular to the extension direction of the clamping edge.

[0013] Preferably, the clamping protrusion is provided with a clamping hole, the clamping hole has a gradually narrowing trend away from the sucking disc main body, the support edges are arranged on both sides of the narrowest end of the clamping hole, and the rectangular protrusion is inserted into the narrow end of the clamping hole from the large end of the clamping hole, and the two clamping edges are clamped on the two support edges through the narrowest end of the clamping hole.

[0014] Preferably, the sucking disc main body includes a disc body and a skeleton, the disc body is covered on the skeleton, the connecting portion is arranged on the skeleton and protrudes from the disc body, and the connecting portion is integrally formed with the skeleton.

[0015] Preferably, the suction disc body further comprises a disc cover, the circular truncated cone is arranged at the middle of the disc cover, and the disc cover is sleeved on the connecting portion through the positioning hole and covers the back of the disc body.

[0016] Preferably, a plurality of annular arrays of strip-shaped through holes are arranged on the disc cover.

[0017] Preferably, the suction disc body comprises a framework, and an elastic colloid is coated on the framework, the circular truncated cone is arranged at the middle of the framework, and the connecting portion is arranged on the circular truncated cone and protrudes from the elastic colloid.

[0018] Preferably, the lower surface of the elastic colloid forms a suction cavity which is deep in the middle and shallow at the periphery, and the connecting portion can extrude the framework so that the elastic colloid is adsorbed on the base surface.

[0019] Preferably, the framework is in the shape of a bowl which is high in the middle and low at the periphery, annular protrusions and a plurality of strip-shaped protrusions are arranged at the outer edge of the framework, the strip-shaped protrusions are circumferentially arranged on the framework, and the annular protrusions penetrate through the strip-shaped protrusions; and a plurality of strip-shaped seams are further arranged at the edge of the framework.

[0020] Preferably, a plurality of strip-shaped holes are further arranged on the framework, the strip-shaped holes are located between the rectangular protrusions and the annular protrusions, and the strip-shaped holes are circumferentially arranged on the framework.

[0021] The utility model discloses have obtained the following beneficial technical effects relative to the prior art:

[0022] 1. The suction disc provided by the utility model is convenient to adjust, a protective cover is arranged between the suction disc body and the receiving piece, a first circular groove on the protective cover is sleeved on a circular truncated cone on the suction disc body, a receiving plate on the receiving piece abuts against the edge of a second circular groove to limit the protective cover, so that the protective cover can rotate relative to the suction disc body, after the suction disc is adsorbed on a base surface, if the downward extension of the protective cover is not in a vertical state, the protective cover can be rotated at this time to adjust the direction of the downward extension of the protective cover and make the downward extension in a vertical direction, so as to conveniently hang external articles, or after the external articles are hung, the downward extension of the protective cover will follow the movement to a vertical state under the gravity of the external articles, the risk that the disc body falls off caused by the uneven force on the suction disc due to the inclination of the downward extension is reduced, and the service life of the suction disc is guaranteed.

[0023] 2. The suction cup provided by the utility model is convenient to adjust, when in use, the suction cup is pressed by external force, the large end of the clamping hole on the supporting piece is sleeved on the rectangular protrusion after the suction cup is fixed at a proper position, the rectangular protrusion is inserted into the supporting piece, the two clamping edges are extruded with the inner wall of the clamping hole, and then the two clamping edges and / or the clamping hole are elastically deformed, then the two clamping edges pass through the narrowest end of the clamping hole, and then the two clamping edges and / or the clamping hole restore the elastic deformation, the two clamping edges are clamped on the two supporting edges, and the reliable connection of the supporting piece and the suction cup body is realized, and the operation is simple and fast. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the first embodiment of the suction cup convenient to adjust in the utility model;

[0025] Figure 2 It is an exploded structural schematic view of the first embodiment of the suction cup convenient to adjust in the utility model;

[0026] Figure 3 It is an exploded structural schematic view of another angle of the first embodiment of the suction cup convenient to adjust in the utility model;

[0027] Figure 4 It is a structural schematic view of the suction cup body of the first embodiment of the suction cup convenient to adjust in the utility model;

[0028] Figure 5 It is a structural schematic view of the second embodiment of the suction cup convenient to adjust in the utility model;

[0029] Figure 6 It is an exploded structural schematic view of the second embodiment of the suction cup convenient to adjust in the utility model;

[0030] Figure 7 It is an exploded structural schematic view of another angle of the second embodiment of the suction cup convenient to adjust in the utility model;

[0031] Figure 8 It is a structural schematic view of the suction cup body of the second embodiment of the suction cup convenient to adjust in the utility model;

[0032] In the drawing: 1 - suction cup body, 101 - disc body, 102 - framework, 103 - disc cover, 104 - rectangular protrusion, 105 - positioning hole, 106 - clamping edge, 107 - slope, 108 - through hole, 109 - blind hole, 110 - circular truncated cone part, 111 - strip-shaped through hole, 112 - elastic colloid, 113 - annular protrusion, 114 - strip-shaped protrusion, 115 - strip-shaped seam, 116 - strip-shaped hole;

[0033] 2- receiving piece, 201- clamping protrusion, 202- clamping hole, 203- support edge, 204- receiving plate;

[0034] 3- protective cover, 301- protective cover through hole, 302- first circular groove, 303- second circular groove, 304- lower extension, 305- clamping groove, 306- annular wall. DETAILED DESCRIPTION

[0035] Embodiment one

[0036] The embodiment provides a suction cup convenient to adjust, which comprises a suction cup body 1 and a receiving piece 2, the suction cup body 1 comprises a disc body 101, a framework 102 and a disc cover 103, the disc body 101 is wrapped on the framework 102, a rectangular protrusion 104 is arranged on the framework 102, the rectangular protrusion 104 protrudes from the disc body 101, and the rectangular protrusion 104 is integrally formed with the framework 102. The disc cover 103 is provided with a positioning hole 105 in the center, and the disc cover 103 is sleeved on the rectangular protrusion 104 through the positioning hole 105 and covers the back of the disc body 101. By wrapping the disc body 101 on the framework 102, the framework 102 can support and shape the disc body 101, can uniformly transmit the pressure received to the disc body 101, can discharge the air in the disc body 101, and can extrude and tightly attach the disc body 101 to the base surface.

[0037] In the embodiment, the top of the rectangular protrusion 104 extends to both sides and is provided with a clamping edge 106, the top edge of the clamping edge 106 is provided with a slope 107, the receiving piece 2 is provided with a hollow clamping protrusion 201, the clamping protrusion 201 is provided with a clamping hole 202, the clamping hole 202 has a gradually narrowing trend away from the suction cup body 1, and the clamping hole 202 is provided with support edges 203 on both sides of the narrowest end, when the rectangular protrusion 104 is inserted into the narrowest end of the clamping hole 202 from the large end of the clamping hole 202, the two clamping edges 106 are extruded with the inner wall of the clamping hole 202, so that the two clamping edges 106 and / or the side wall of the clamping hole 202 are elastically deformed, then the two clamping edges 106 pass through the narrowest end of the clamping hole 202, and subsequently the two clamping edges 106 and / or the clamping hole 202 restore the elastic deformation, and the two clamping edges 106 are clamped on the two support edges 203. Since the narrowest end of the clamping hole 202 is smaller than the size of the two clamping edges 106, the narrowest end of the clamping hole 202 and the two support edges 203 and the two clamping edges 106 form mutual limiting, the two clamping edges 106 cannot fall off from the narrow end of the clamping hole 202, in addition, the limiting block (not shown) on the receiving piece 2 and the rectangular protrusion 104 form mutual limiting, and the receiving piece 2 cannot fall off from the rectangular protrusion 104, and the connection reliability is high. When the receiving piece 2 is clamped to the rectangular protrusion 104, only the large end of the clamping hole 202 on the receiving piece 2 is sleeved on the rectangular protrusion 104, and then pressure is applied to the receiving piece 2, so that the reliable connection of the receiving piece 2 and the suction cup body 1 is realized, and the operation is simple and fast.

[0038] The rectangular protrusion 104 is provided with a through hole 108 parallel to the extension direction of the clamping edge 106, and is also provided with a blind hole 109 perpendicular to the extension direction of the clamping edge 106. By setting the through hole 108 and the blind hole 109 in cooperation with the slope 107, when the two clamping edges 106 are pressed against each other and the clamping hole 202, the clamping edge 106 is more flexible and more easily elastically deformed, and the clamping edge 106 is more easily drawn to the center of the rectangular protrusion 104, so that the receiving piece 2 can be more labor-saving and convenient to connect with the rectangular protrusion 104.

[0039] In the embodiment, a protective cover 3 is arranged between the suction disc body 1 and the receiving piece 2, the middle part of the protective cover 3 is provided with a protective cover through hole 301, the clamping protrusion 201 on the receiving piece 2 passes through the protective cover through hole 301 and is connected with the rectangular protrusion 104, the edge of the protective cover through hole 301 extends in the direction of the suction disc body 1 to form a first circular groove 302, the middle part of the disc cover 103 is provided with a circular table part 110, the positioning hole 105 is arranged in the middle part of the circular table part 110, and the first circular groove 302 is sleeved on the circular table part 110 and can rotate relative to the circular table part 110. The edge of the protective cover through hole 301 extends in the direction of the receiving piece to form a second circular groove 303, the first circular groove 302 and the second circular groove 303 are connected through the protective cover through hole 301, the receiving piece 2 is provided with a receiving plate 204, the receiving plate 204 abuts against the edge of the second circular groove 303, so that the receiving plate presses and positions the protective cover in the direction close to the receiving piece, and the protective cover 3 will not be displaced when rotating relative to the disc cover 103. The protective cover 3 is also provided with a hanging part connected with external articles, and the hanging part is any one of a hook, a clamping groove or a screw. In the preferred embodiment, a downward extending part 304 is arranged on the outer side wall of the protective cover 3, the end part of the downward extending part 304 is provided with a clamping groove 305 connected with external articles, and the clamping groove 305 is convenient for clamping or hanging connection with external articles. After the suction disc body 1 is adsorbed on the base surface, if the downward extending part 304 is not in the vertical state, the protective cover 3 can be rotated at this time to adjust the direction of the downward extending part 304 on the protective cover 3 and make it in the vertical direction, so as to facilitate hanging external articles, or after hanging external articles, the downward extending part of the protective cover will follow the movement to the vertical state under the gravity of the external articles, reducing the risk of uneven force of the disc body 101 caused by the inclined hanging of the downward extending part 304 when hanging external articles, and ensuring the service life of the suction disc.

[0040] In the embodiment, the protective cover 3 comprises an annular wall 306 which surrounds the suction disc body 1, and preferably is integrally formed with the receiving member 2, so that after the suction disc body 1 is adsorbed on the base surface, the annular wall 306 surrounds the suction disc body 1 to form a protective shell for the suction disc body 1, avoiding deformation of the suction disc caused by external force, preventing the vacuum cavity from entering air to make the suction disc body 1 lose adsorption effect. A plurality of annular arrays of strip-shaped through holes 111 are arranged on the disc cover 103, and when the disc cover 103 is extruded by external force, the disc cover 103 is slightly deformed, the length direction of the strip-shaped through holes 111 is the same as the radial direction of the disc cover 103, and when the disc cover 103 is deformed by extrusion, flexible deformation space is provided to reduce the risk of breakage of the disc cover 103.

[0041] Embodiment two

[0042] The embodiment provides a suction disc convenient to adjust, which comprises a suction disc body 1 and a receiving member 2, the suction disc body 1 comprises a framework 102, an elastic body 112 is coated on the framework 102, a rectangular protrusion 104 is arranged on the framework 102 and protrudes from the elastic body 112, the lower surface of the elastic body 112 forms a suction cavity which is deep in the middle and shallow around, the rectangular protrusion 104 can extrude the framework 102 to make the elastic body 112 adsorbed on the base surface, the receiving member 2 is connected with a protective cover 3, the structure of the receiving member 2 and the protective cover 3 in the embodiment is the same as that in embodiment one, and the connection form of the rectangular protrusion 104 and the receiving member 2 in the embodiment is the same as that in embodiment one, which will not be repeated here.

[0043] In the embodiment, the circular truncated cone part 110 is arranged at the middle part of the framework 102 and located at the outer edge of the rectangular protrusion 104, the first circular groove 302 is sleeved on the circular truncated cone part 110 and can rotate relative to the circular truncated cone part 110, and the receiving plate 204 abuts against the edge of the second circular groove 303, so that the receiving plate presses and limits the protective cover in the direction close to the receiving member, and the protective cover 3 will not be displaced when rotating relative to the framework 102. Similarly, after the suction disc body 1 is adsorbed on the base surface, if the downward extending part 304 is not in the vertical state, the protective cover 3 can be rotated at this time to adjust the direction of the downward extending part 304 on the protective cover 3 and make it in the vertical direction, so as to facilitate hanging external articles, and reduce the risk that the suction disc is unevenly stressed caused by the inclination of the downward extending part 304 and the external articles, and ensure the service life of the suction disc.

[0044] In the embodiment, the framework 102 is in the shape of a bowl with a middle higher and four sides lower, and annular protrusions 113 and strip protrusions 114 are arranged at the outer edge of the framework 102, the strip protrusions 114 are evenly arranged on the framework 102 in the circumferential direction, and the strip protrusions 114 can be radially extended or curved in the same direction, the annular protrusions 113 pass through the strip protrusions 114 and connect the strip protrusions 114, thereby enhancing the strength of the framework 102 and the connection between the elastic colloid 112 and the framework 102, and preventing the elastic colloid 112 from falling off the framework 102.

[0045] In the embodiment, a plurality of strip holes 116 are arranged on the framework 102, the strip holes 116 are located between the rectangular protrusions 104 and the annular protrusions 113, and the strip holes 116 are arranged on the framework 102 in the circumferential direction. The strip holes 116 can be radially extended or curved in the same direction, and the arrangement of the strip holes 116 and the strip protrusions 115 makes it more convenient and labor-saving to deform the framework 102.

[0046] The suction cup provided by the utility model is convenient to adjust, in use, the large end of the clamping hole 202 on the supporting piece 2 is sleeved on the rectangular protrusion 104 after the suction cup is fixed at a proper position by external force pressing the suction cup, the pressure of the supporting piece 2 perpendicular to the suction cup is applied, the rectangular protrusion 104 is inserted into the supporting piece 2, the two clamping edges 106 are extruded with the inner wall of the clamping hole 202, thereby making the two clamping edges 106 and / or the clamping hole 202 elastically deformed, then the two clamping edges 106 pass through the narrowest end of the clamping hole 202, subsequently the two clamping edges 106 and / or the clamping hole 202 restore the elastic deformation, and the two clamping edges 106 are clamped on the two supporting edges 203, thereby realizing the reliable connection of the supporting piece 2 and the suction cup main body 1, and the operation is simple and fast. After the suction cup is adsorbed on the base surface, if the lower extension part 304 of the protective cover 3 is not in the vertical state, the protective cover 3 can be rotated at this time to adjust the direction of the lower extension part 304 on the protective cover 3 and make it in the vertical direction to hang external articles, or after the external articles are hung, the lower extension part 304 of the protective cover is followed to the vertical state under the gravity of the external articles, thereby reducing the risk that the disc body 101 falls off caused by the uneven force of the suction cup when the lower extension part 304 inclines to hang the external articles, and the service life of the suction cup is guaranteed.

[0047] The principle and implementation mode of the utility model are described by using specific examples, and the above examples are only used to help understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An easily adjustable suction cup, comprising a suction cup body and a receiving component, wherein the suction cup body is provided with a connecting portion, characterized in that: A protective cover is provided between the suction cup body and the receiving component. The protective cover has a protective cover through hole. The connecting part passes through the protective cover through hole and is connected to the receiving component. The protective cover also has a first circular groove facing the suction cup body. The suction cup body has a frustum portion. The first circular groove is fitted on the frustum portion and can rotate relative to the suction cup body. The receiving component limits the position of the protective cover.

2. The adjustable suction cup according to claim 1, characterized in that: The connecting part includes a rectangular protrusion, and the top of the rectangular protrusion extends to both sides with snap-fit ​​edges. The receiving part is provided with snap-fit ​​protrusions, and a support edge corresponding to the snap-fit ​​edge is provided in the snap-fit ​​protrusions. The snap-fit ​​edge and the support edge snap-fit ​​together to connect the suction cup body and the receiving part.

3. The adjustable suction cup according to claim 2, characterized in that: The protective cover covers the suction cup body, and the through hole of the protective cover is located in the middle of the protective cover. The snap-fit ​​protrusion on the receiving member passes through the through hole of the protective cover and is connected to the rectangular protrusion. The edge of the through hole of the protective cover extends in the direction towards the suction cup body to form the first circular groove.

4. The adjustable suction cup according to claim 3, characterized in that: The protective cover is also provided with a second circular groove, which is formed by extending from the edge of the through hole of the protective cover toward the receiving member. The second circular groove is connected to the first circular groove. The receiving member is provided with a receiving plate, which abuts against the edge of the second circular groove to limit the position of the protective cover.

5. The adjustable suction cup according to claim 1, characterized in that: The protective cover includes an annular wall that surrounds the suction cup body.

6. The adjustable suction cup according to claim 1, characterized in that: The protective cover is also provided with a hanging part for connecting to external objects. The hanging part can be any one of a hook, a slot, or a screw.

7. The adjustable suction cup according to claim 2, characterized in that: The top edge of the snap-fit ​​edge is provided with a slope, the rectangular protrusion is provided with a through hole parallel to the extension direction of the snap-fit ​​edge, and the rectangular protrusion is also provided with a blind hole perpendicular to the extension direction of the snap-fit ​​edge.

8. The adjustable suction cup according to claim 2, characterized in that: The snap-fit ​​protrusion is provided with snap-fit ​​holes, which gradually narrow towards the side away from the suction cup body. The support edges are provided on both sides of the narrowest end of the snap-fit ​​hole. The rectangular protrusion is inserted into the narrow end of the snap-fit ​​hole from the large end of the snap-fit ​​hole, and the two snap-fit ​​edges are snapped onto the two support edges through the narrowest end of the snap-fit ​​hole.

9. The adjustable suction cup according to any one of claims 1 to 8, characterized in that: The suction cup body includes a disc body and a frame. The disc body covers the frame, and the connecting part is set on the frame and protrudes from the disc body. The connecting part and the frame are integrally formed.

10. The adjustable suction cup according to claim 9, characterized in that: The suction cup body also includes a disc cover, the frustum portion is located in the middle of the disc cover, the frustum portion is provided with a positioning hole, and the disc cover is sleeved on the connecting portion through the positioning hole and covers the back of the disc body.

11. The adjustable suction cup according to claim 9, characterized in that: The disk cover has a plurality of annular arrays of strip-shaped through holes.

12. The adjustable suction cup according to any one of claims 1 to 8, characterized in that: The suction cup body includes a skeleton, on which an elastic colloid is covered. The frustum portion is located in the middle of the skeleton, and the connecting portion is located on the frustum portion and protrudes from the elastic colloid.

13. The adjustable suction cup according to claim 12, characterized in that: The lower surface of the elastic colloid forms an adsorption cavity that is deep in the middle and shallow around the edges. The connecting part can compress the skeleton to make the elastic colloid adsorb onto the base surface.

14. The adjustable suction cup according to claim 12, characterized in that: The skeleton is bowl-shaped with a high center and low edges. An annular protrusion and several strip-shaped protrusions are provided on the outer edge of the skeleton. The strip-shaped protrusions are arranged circumferentially on the skeleton, and the annular protrusions penetrate the strip-shaped protrusions. Several strip-shaped slits are also provided along the edge of the skeleton.

15. The adjustable suction cup according to claim 14, characterized in that: The skeleton is also provided with a number of strip holes, which are located between the connecting part and the annular protrusion, and the strip holes are arranged circumferentially on the skeleton.

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