Strong-wind-resistant boat cover for luxury yacht

Abstract

The invention relates to the technical field of ship covers, in particular to a strong-wind-resistant ship cover for a luxury yacht, a ship cover device in the scheme is composed of a ship cover main body, a ship cover main support and a ship cover tensioning mechanism, and the two ends of the ship cover main body are tensioned through the arranged ship cover tensioning mechanism, so that the assembly strength of the ship cover main body is improved; the influence of strong wind on the ship cover main body is resisted; the tensioning screw rod and the internal thread sleeve body are used in cooperation, the ship cover mounting sleeve is pulled through the internal thread sleeve body, and then the ship cover body is tensioned. For stable work of the ship cover main support, a first mounting seat body at the bottom end of the ship cover main support is fixedly connected with a ship body through an arranged stabilizing assembly, and a hexagonal screw head is locked through matched use of an arranged internal thread fastening cap body and an annular screw groove; connection looseness of the ship cover main support caused by the positioning studs in a strong wind environment is avoided; and the positive effect is achieved on improving the use stability and strong wind resistance of the ship cover.

Description

Technical Field

[0001] This invention relates to the field of ship cover technology, and in particular to a wind-resistant ship cover for luxury yachts. Background Technology

[0002] A yacht is a vessel equipped with a mechanical propulsion system, intended solely for the owner's own use for sightseeing, leisure, and entertainment activities. In some countries, yachts are mostly privately owned, like cars; while in others, they are often used as part of parks or tourist attractions for public consumption.

[0003] For boat covers used on small yachts, they are generally supported by a corresponding support frame. Regarding the overall use of the boat cover device, firstly, the support feet at the bottom of the support frame are connected to the hull by bolts. In strong winds, the connection between the support frame and the hull is prone to loosening, which affects the use of the overall boat cover. Secondly, when the support frame supports the boat cover, in strong winds, the top of the boat cover is easily affected by the wind and sways. The support frame used to support the boat cover lacks a suitable tensioning mechanism to resist strong winds, thus failing to meet the requirements for use in strong wind environments.

[0004] Therefore, this invention proposes a wind-resistant boat cover for luxury yachts to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a wind-resistant cover for luxury yachts to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wind-resistant boat cover for a luxury yacht, comprising a boat cover body and a boat cover main support, with boat cover mounting sleeves symmetrically arranged at both ends of the boat cover body, the boat cover main support passing through one of the boat cover mounting sleeves, and a first boat cover sub-support and a second boat cover sub-support fixedly arranged on the boat cover main support by a fixing sleeve clamp, the first boat cover sub-support passing through the other boat cover mounting sleeve, and a first mounting base fixedly arranged at the bottom end of the first boat cover sub-support, and the first mounting base having a first mounting hole; A connector is provided on the ship cover mounting sleeve. The connector is fixedly connected to the internal threaded sleeve body, and the internal threaded sleeve body is connected to the ship cover tensioning mechanism. The first mounting base is fixed by a set stabilizing component.

[0007] Preferably, the ship cover tensioning mechanism includes a tensioning screw, an adjusting handle, a cylindrical head, auxiliary balls, a connecting cap, an annular guide groove, a mounting screw groove, a movable rotating column, a fixed plate frame, a connecting pin, a second mounting base, a second mounting hole, and a limiting component; the tensioning screw is threadedly connected to the internally threaded sleeve, and a cylindrical head is fixedly provided at the bottom end of the tensioning screw; adjusting handles are fixedly provided at equal intervals on the side wall of the tensioning screw; auxiliary balls are movably embedded at equal intervals at the upper and lower ends of the cylindrical head, and the auxiliary balls are arranged in an annular pattern at equal intervals.

[0008] Preferably, the cylindrical head is placed in the connecting cap and is limited by a limiting component. The connecting cap is fixedly mounted on the side wall of the movable rotating column. The movable rotating column is connected to the fixed plate frame via a connecting pin. The fixed plate frame is fixedly mounted on the second mounting base and has a second mounting hole. The second mounting hole is also fixed by a stabilizing component.

[0009] Preferably, mounting screw grooves are symmetrically provided on the inner bottom end of the connecting cap, and the annular guide groove is also provided on the inner bottom end of the connecting cap, and the annular guide groove corresponds to the position of the auxiliary ball bearings arranged in an annular shape at the bottom end of the cylindrical head.

[0010] Preferably, the limiting component includes a cover housing, a limiting ring, an arc-shaped guide groove, a cylindrical through groove, and mounting screws; the limiting ring is fixedly provided on the inner side of the cover housing, and an arc-shaped guide groove is provided on the inner side of the limiting ring, and a cylindrical through groove is provided in the cover housing.

[0011] Preferably, there are two enclosure shells, which are joined together to form a limiting shell. The limiting shell is fixed by mounting screws and is cylindrical. The outer circumferential surface of the limiting shell contacts the inner sidewall of the connecting cap.

[0012] Preferably, the arc-shaped guide grooves on the inner sides of the two limiting rings are joined to form an annular groove, and the annular groove corresponds to the position of the auxiliary ball bearings arranged in an annular shape at the top of the cylindrical head.

[0013] Preferably, the stabilizing component includes an annular threaded groove, a positioning stud, a hexagonal screw head, a locking slot, an internally threaded fastening cap, anti-slip stripes, a side through groove, a rubber pad, and a pull-out protrusion; the annular threaded groove is disposed on the first mounting base, and the annular threaded groove and the center of the first mounting hole are on the same straight line; the annular threaded groove is also disposed on the second mounting base, and the center of the annular threaded groove and the center of the second mounting hole are on the same straight line.

[0014] Preferably, one end of the positioning stud is fixedly provided with a hexagonal screw head, and a locking groove is provided on the side of the hexagonal screw head, wherein the locking groove is annular.

[0015] Preferably, the internally threaded fastening cap is threadedly connected to the annular threaded groove. Anti-slip stripes are provided on the outer annular surface of the internally threaded fastening cap. A side through groove is provided through the annular sidewall of the internally threaded fastening cap. The rubber pad is adapted to and inserted into the side through groove. A pull-out protrusion is fixedly provided at one end of the rubber pad. An arc-shaped concave surface is provided on the end face of the other end of the rubber pad. One end of the rubber pad is adapted to and engaged with the annular threaded groove, and the arc-shaped concave surface is adapted to and fits against the inner annular surface of the annular threaded groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention relates to a wind-resistant yacht cover for luxury yachts. It includes a main cover body and a main cover support. Symmetrical yacht cover mounting sleeves are arranged at both ends of the main cover body. The main cover support passes through one of the mounting sleeves. A first and second secondary yacht cover supports are fixedly mounted on the main cover support via fixing clips. The first secondary yacht cover support passes through the other mounting sleeve. A first mounting base with a first mounting hole is fixedly mounted at the bottom of the first secondary yacht cover support. A connecting body is provided on the mounting sleeve, and the connecting body is fixedly connected to an internally threaded sleeve. The internally threaded sleeve is connected to a yacht cover tensioning mechanism. The first mounting base is fixed by a stabilizing component. In this design, the yacht cover device consists of a main cover body and a main cover support. Composed of a hull tensioning mechanism, this system serves two main purposes. Firstly, it tightens both ends of the hull body, enhancing its assembly strength and resisting the effects of strong winds. Specifically, the tensioning screw and internally threaded sleeve work together to pull the hull mounting sleeve, thus tensioning the hull body. Secondly, for the stable operation of the hull main support, a stabilizing component securely connects the first mounting base at the bottom of the main support to the hull. The internally threaded fastening cap and annular threaded groove lock the hexagonal screw head, preventing loosening of the main support connection in strong winds. This system effectively improves the stability and wind resistance of the hull. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the left side of the ship cover structure connection of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structural connection at point A; Figure 3 This is a schematic diagram of the connection of the ship cover structure of the present invention on the right side; Figure 4 for Figure 3 Enlarged schematic diagram of the structural connection at point B; Figure 5 This is an exploded right-side schematic diagram showing the connection between the ship cover tensioning mechanism and the stabilizing component structure of the present invention; Figure 6 for Figure 5 Enlarged schematic diagram of the structural connection at point C; Figure 7 This is an exploded bottom view of the connection between the ship cover tensioning mechanism and the stabilizing component structure of the present invention; Figure 8 for Figure 7 Enlarged schematic diagram of the structural connection at point D; Figure 9 This is an exploded left-side schematic diagram of the connection between the ship cover tensioning mechanism and the stabilizing component structure of the present invention; Figure 10 for Figure 9 Enlarged schematic diagram of the structural connection at point E in the middle.

[0018] In the diagram: 1. Ship cover body; 11. Ship cover mounting sleeve; 2. Ship cover main bracket; 21. First ship cover auxiliary bracket; 22. Second ship cover auxiliary bracket; 23. Fixing clip; 24. First mounting base; 25. First mounting hole; 3. Connector; 4. Internal threaded sleeve; 501. Tensioning screw; 502. Adjusting handle; 503. Cylindrical head; 504. Auxiliary ball bearing; 505. Connecting cap; 506. Annular guide groove; 507. Mounting screw groove; 508. Movable rotating column; 509. Fixing plate. Frame 509, connecting pin 510, second mounting base 511, second mounting hole 512, enclosure housing 601, limiting ring 602, arc-shaped guide groove 603, cylindrical through groove 604, mounting screw 605, annular screw groove 701, positioning stud 702, hexagonal screw head 703, locking slot 704, internal thread fastening cap 705, anti-slip stripe 706, side through groove 707, rubber pad 708, pull-out protrusion 709. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1-10A wind-resistant hood for luxury yachts includes a hood body 1 and a hood main support 2. Hoisting sleeves 11 are symmetrically arranged at both ends of the hood body 1. The hood main support 2 passes through one of the hood mounting sleeves 11. A first hood sub-support 21 and a second hood sub-support 22 are fixedly arranged on the hood main support 2 by a fixing clip 23. The first hood sub-support 21 passes through the other hood mounting sleeve 11. A first mounting base 24 is fixedly arranged at the bottom end of the first hood sub-support 21, and a first mounting hole 25 is provided on the first mounting base 24. A connecting body 3 is provided on the hood mounting sleeve 11. The connecting body 3 is fixedly connected to an internally threaded sleeve 4, and the internally threaded sleeve 4 is connected to a hood tensioning mechanism. The first mounting base 24 is fixed by a set stabilizing component.

[0021] The ship cover device in this solution consists of a ship cover body 1, a ship cover main support 2, and a ship cover tensioning mechanism. On the one hand, the ship cover tensioning mechanism tightens both ends of the ship cover body 1, thereby improving the assembly strength of the ship cover body 1 and resisting the impact of strong winds on the ship cover body 1. Specifically, the tensioning screw 501 and the internal threaded sleeve 4 work together to pull the ship cover mounting sleeve 11, thereby tensioning the ship cover body 1. On the other hand, for the stable operation of the ship cover main support 2, the first mounting base 24 at the bottom of the ship cover main support 2 is fixedly connected to the hull by a stabilizing component. The internal threaded fastening cap 705 and the annular screw groove 701 work together to lock the hexagonal screw head 703, thereby preventing the positioning stud 702 from loosening the connection of the ship cover main support 2 in strong winds. Similarly, the fixed connection between the second mounting base 511 and the hull is also locked by a stabilizing component to improve its connection stability.

[0022] The ship cover tensioning mechanism includes a tensioning screw 501, an adjusting handle 502, a cylindrical head 503, auxiliary balls 504, a connecting cap 505, an annular guide groove 506, a mounting screw groove 507, a movable rotating column 508, a fixed plate frame 509, a connecting pin 510, a second mounting base 511, a second mounting hole 512, and a limiting assembly. The tensioning screw 501 is threadedly connected to the internally threaded sleeve 4, and a cylindrical head 503 is fixedly installed at the bottom end of the tensioning screw 501. Adjusting handles 502 are fixedly installed at equal intervals on the side wall of the tensioning screw 501. Auxiliary balls 504 are equidistantly and movably fitted at equal intervals at the upper and lower ends of the cylindrical head 503. The distance is arranged in a ring; a mounting screw groove 507 is symmetrically arranged on the inner bottom end of the connecting cap 505, and an annular guide groove 506 is also arranged on the inner bottom end of the connecting cap 505. The annular guide groove 506 and the auxiliary ball bearing 504 arranged in a ring at the bottom end of the cylindrical head body 503 are positioned accordingly; that is, when tightening both ends of the ship cover body 1, the tightening screw 501 is rotated by adjusting the handle rod 502, that is, the internal threaded sleeve body 4 is pulled by the threaded connection between the tightening screw 501 and the internal threaded sleeve body 4 until it is tightened. Then, the first mounting base 24 and the second mounting base 511 are installed and fixed by the set stabilizing components.

[0023] The cylindrical head 503 is placed in the connecting cap 505 and is limited by a limiting component. The connecting cap 505 is fixedly mounted on the side wall of the movable rotating column 508. The movable rotating column 508 is connected to the fixed plate frame 509 via a connecting pin 510. The fixed plate frame 509 is fixedly mounted on the second mounting base 511, and a second mounting hole 512 is provided in the second mounting base 511. The second mounting hole 512 is also fixed by a stabilizing component. The limiting component includes a cover housing 601, a limiting ring 602, an arc-shaped guide groove 603, a cylindrical through groove 604, and a mounting screw 605. The limiting ring 602 is fixedly mounted on the inner side of the cover housing 601. Furthermore, an arc-shaped guide groove 603 is provided on the inner side of the limiting ring 602, and a cylindrical through groove 604 is provided in the enclosure housing 601; two enclosure housings 601 are provided, and the two enclosure housings 601 are joined to form a limiting shell, and the limiting shell is fixed by a mounting screw 605. The limiting shell is cylindrical, and the outer ring surface of the limiting shell contacts the inner wall of the connecting cap 505; the arc-shaped guide grooves 603 on the inner side of the two limiting rings 602 are joined to form an annular groove, and the annular groove corresponds to the position of the auxiliary ball 504 arranged in an annular shape at the top of the cylindrical head 503; the cylindrical head 503 at the bottom of the tensioning screw 501 is inserted into the connecting cap 505 to facilitate tensioning. The rotation of the screw 501 provides a limiting component for the cylindrical head 503. Specifically, the limiting shell formed by the mating of two enclosure housings 601 limits the cylindrical head 503. For the connection between the cylindrical head 503 and the connecting cap 505, the cylindrical head 503 is first inserted into the connecting cap 505, with the auxiliary ball bearing 504, arranged in annular shape at the bottom of the cylindrical head 503, placed in the annular guide groove 506 at the bottom of the inner cavity of the connecting cap 505. Then, the two enclosure housings 601 are installed sequentially, with one enclosure housing 601 first inserted into the connecting cap 505, ensuring that the cylindrical through groove 604 in the enclosure housing 601 engages with the connecting cap. Align one of the mounting screw grooves 507 in 505, then pass the mounting screw 605 through the cylindrical through groove 604, and finally thread one end of the mounting screw 605 into the mounting screw groove 507. At this time, the arc-shaped guide groove 603 set inside the limiting ring 602 is located at the position of the auxiliary ball 504 arranged in a ring at the top of the cylindrical head 503. Then install the other cover housing 601 by inserting the cover housing 601 into the connecting cap 505. At this time, the cylindrical through groove 604 in the cover housing 601 is aligned with the other mounting screw groove 507 in the inner cavity of the connecting cap 505. Finally, use the mounting screw 605 to fix the cover housing 601.Furthermore, the connecting cap 505 is mounted on the side wall of the movable pivot 508, and the movable pivot 508 is movably positioned. This is to improve the flexibility of the second mounting base 511 in its installation and adaptation to the hull.

[0024] The first mounting base 24 and the second mounting base 511 at the bottom of the main support bracket 2 of the ship cover are fixed by a set of stabilizing components to ensure the overall stability of the ship cover. The stabilizing components include an annular screw groove 701, a positioning stud 702, a hexagonal screw head 703, a locking groove 704, an internal thread fastening cap 705, anti-slip stripes 706, a side through groove 707, a rubber pad 708, and a pull-out protrusion 709. The annular screw groove 701 is set on the first mounting base 24, and the center of the annular screw groove 701 and the first mounting hole 25 are on the same straight line. An annular threaded groove 701 is also provided on the second mounting base 511, and the centers of the annular threaded groove 701 and the second mounting hole 512 are on the same straight line; one end of the positioning stud 702 is fixedly provided with a hexagonal screw head 703, and a locking groove 704 is provided on the side of the hexagonal screw head 703, the locking groove 704 being annular; the internal thread fastening cap 705 is threadedly connected to the annular threaded groove 701, and anti-slip stripes 706 are provided on the outer annular surface of the internal thread fastening cap 705, and a side through groove 707 is provided through the annular sidewall of the internal thread fastening cap 705, and a rubber pad 70 8. The rubber pad 708 is fitted with a side through groove 707 and is plugged into. A pull-out protrusion 709 is fixedly provided at one end of the rubber pad 708. The end face of the other end of the rubber pad 708 is provided with an arc-shaped concave surface. One end of the rubber pad 708 is fitted with an annular screw groove 701 and the arc-shaped concave surface is fitted and fits against the inner annular surface of the annular screw groove 701. After the first mounting body 24 and the second mounting body 511 are fixed by the positioning stud 702, in order to further improve the connection stability of the positioning stud 702, this solution first uses the internal thread fastening cap 705 to fasten the positioning stud 702. The clamping limit is used to prevent the positioning stud 702 from shifting in its axial direction, thus preventing the connection between the first mounting body 24 or the second mounting body 511 and the positioning stud 702 from becoming loose. The cap of the internal thread fastening cap 705 is threadedly connected to the annular thread groove 701, and then the internal thread fastening cap 705 is tightened. At this time, the top of the tightened internal thread fastening cap 705 presses against the hexagonal screw head 703. During the rotation of the internal thread fastening cap 705, the anti-slip stripes 706 on the outer wall of the internal thread fastening cap 705 are designed to facilitate operation by the operator.

[0025] To further improve the locking performance of the internal thread fastening cap 705 on the positioning stud 702, this design also provides a locking groove 704 on the annular sidewall of the hexagonal screw head 703. The locking groove 704 is annular. After the internal thread fastening cap 705 is tightened, i.e., after the internal thread fastening cap 705 presses against the hexagonal screw head 703, the side through groove 707 on the sidewall of the internal thread fastening cap 705 aligns with the locking groove 704 on the annular sidewall of the hexagonal screw head 703. Then, a rubber washer 708 is inserted into the side through groove 707 until one end of the rubber washer 708 is engaged in the locking groove 704. Specifically, the end face of the rubber washer 708 is a concave arc, which fits against the inner annular surface of the annular groove 701. A pull-out protrusion is provided at the other end of the rubber washer 708. Body 709 serves to facilitate the operator in engaging and disengaging the rubber pad 708 with the locking groove 704. Specifically, when it is necessary to release the lock between the internal thread fastening cap 705 and the hexagonal screw head 703, first release the lock of the internal thread fastening cap 705 by pinching and pulling the protruding strip 709, then forcefully pull out the rubber pad 708, thus disengaging the rubber pad 708 from the locking groove 704. Next, rotate the internal thread fastening cap 705 in the opposite direction until the cap of the internal thread fastening cap 705 separates from the annular thread groove 701, thereby releasing the clamping lock of the annular thread groove 701 on the positioning stud 702. Finally, release the fixing of the positioning stud 702, thus completing the release of the first mounting base 24 and the second mounting base 511.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A wind-resistant cover for a luxury yacht, comprising a cover body (1) and a cover main support (2), with cover mounting sleeves (11) symmetrically arranged at both ends of the cover body (1), the cover main support (2) passing through one of the cover mounting sleeves (11), and a first cover sub-support (21) and a second cover sub-support (22) fixedly arranged on the cover main support (2) by a fixing sleeve clip (23), the first cover sub-support (21) passing through the other cover mounting sleeve (11), and a first mounting base (24) fixedly arranged at the bottom end of the first cover sub-support (21), and a first mounting hole (25) provided on the first mounting base (24); Its features are: A connector (3) is provided on the ship cover mounting sleeve (11). The connector (3) is fixedly connected to the internal threaded sleeve body (4), and the internal threaded sleeve body (4) is connected to the ship cover tensioning mechanism. The first mounting base (24) is fixed by a set stabilizing component.

2. The wind-resistant shroud for luxury yachts according to claim 1, characterized in that: The ship cover tensioning mechanism includes a tensioning screw (501), an adjusting handle (502), a cylindrical head (503), auxiliary balls (504), a connecting cap (505), an annular guide groove (506), a mounting screw groove (507), a movable rotating column (508), a fixed plate frame (509), a connecting pin (510), a second mounting base (511), a second mounting hole (512), and a limiting component; the tensioning screw (501) is threadedly connected to the internal threaded sleeve body (4), and a cylindrical head (503) is fixedly provided at the bottom end of the tensioning screw (501). The adjusting handle (502) is fixedly provided at equal intervals on the side wall of the tensioning screw (501). The auxiliary balls (504) are equidistantly and movably embedded at the upper and lower ends of the cylindrical head (503), and the auxiliary balls (504) are arranged in an annular pattern at equal intervals.

3. The wind-resistant shroud for luxury yachts according to claim 2, characterized in that: The cylindrical head (503) is placed in the connecting cap (505), and the cylindrical head (503) is limited by the set limiting component. The connecting cap (505) is fixedly set on the side wall of the movable rotating column (508). The movable rotating column (508) is connected to the fixed plate frame (509) through the connecting pin (510). The fixed plate frame (509) is fixedly set on the second mounting base (511), and a second mounting hole (512) is provided in the second mounting base (511). The second mounting hole (512) is also fixed by the set stabilizing component.

4. The wind-resistant shroud for luxury yachts according to claim 2, characterized in that: A mounting screw groove (507) is symmetrically provided on the inner bottom end of the connecting cap (505), and the annular guide groove (506) is also provided on the inner bottom end of the connecting cap (505). The annular guide groove (506) and the auxiliary ball (504) arranged in annular shape on the bottom end of the cylindrical head body (503) are positioned corresponding to each other.

5. The wind-resistant shroud for luxury yachts according to claim 2, characterized in that: The limiting component includes a cover housing (601), a limiting ring (602), an arc-shaped guide groove (603), a cylindrical through groove (604), and mounting screws (605); the limiting ring (602) is fixedly provided on the inner side of the cover housing (601), and an arc-shaped guide groove (603) is provided on the inner side of the limiting ring (602), and a cylindrical through groove (604) is provided in the cover housing (601).

6. The wind-resistant shroud for luxury yachts according to claim 5, characterized in that: Two cover shells (601) are provided. The two cover shells (601) are joined together to form a limiting shell. The limiting shell is fixed by the provided mounting screws (605). The limiting shell is cylindrical. The outer ring surface of the limiting shell contacts the inner wall of the connecting cap (505).

7. The wind-resistant shroud for luxury yachts according to claim 5, characterized in that: The arc-shaped guide grooves (603) on the inner sides of the two limiting ring bodies (602) are joined to form an annular groove, and the annular groove corresponds to the position of the auxiliary ball (504) arranged in an annular shape at the top of the cylindrical head body (503).

8. The wind-resistant shroud for luxury yachts according to claim 1, characterized in that: The stabilizing components include an annular screw groove (701), a positioning stud (702), a hexagonal screw head (703), a locking slot (704), an internal thread fastening cap (705), anti-slip stripes (706), a side through groove (707), a rubber pad (708), and a pull-out protrusion (709); the annular screw groove (701) is provided on the first mounting base (24), and the annular screw groove (701) and the first mounting hole (25) are on the same straight line. The annular screw groove (701) is also provided on the second mounting base (511), and the annular screw groove (701) and the second mounting hole (512) are on the same straight line.

9. The wind-resistant shroud for luxury yachts according to claim 8, characterized in that: One end of the positioning stud (702) is fixedly provided with a hexagonal screw head (703), and a locking groove (704) is provided on the side of the hexagonal screw head (703), the locking groove (704) being annular.

10. The wind-resistant shroud for luxury yachts according to claim 8, characterized in that: The internal thread fastening cap (705) is threadedly connected to the annular threaded groove (701). Anti-slip stripes (706) are provided on the outer annular surface of the internal thread fastening cap (705). A side through groove (707) is provided through the annular sidewall of the internal thread fastening cap (705). The rubber pad (708) is adapted to and inserted into the side through groove (707). A pull-out protrusion (709) is fixedly provided at one end of the rubber pad (708). An arc-shaped concave surface is provided on the end face of the other end of the rubber pad (708). One end of the rubber pad (708) is adapted to and engaged with the annular threaded groove (701), and the arc-shaped concave surface is adapted to and fits against the inner annular surface of the annular threaded groove (701).

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