Underwater three-section folding antenna and folding assembly

Abstract

The application discloses an underwater three-section folding antenna and a folding assembly, and aims to solve the problem that an antenna support is automatically unfolded and locked after a device is put into the sea, and the technical scheme is as follows: the antenna support comprises a first rod piece, a second rod piece and a third rod piece, the first rod piece, the second rod piece and the third rod piece are sequentially connected in a head-to-tail mode through a hinge piece, the hinge piece comprises two connecting plates, a rotating sleeve one and a rotating sleeve two are respectively fixed on the two connecting plates, the rotating sleeve one and the rotating sleeve two are rotationally connected through a rotating shaft, and the hinge piece further comprises a locking mechanism, which is used for locking and fixing the two connecting plates after the two connecting plates are stretched. The main purpose of the application is to solve the problem that an antenna support is automatically unfolded and locked after a device is put into the sea, and the whole process is dominated by the buoyancy of the outer cover and the gravity of the lower section, and the self-locking is completed by the torsional spring structure, so that an additional electric control unit is not needed.

Description

Technical Field

[0001] This invention relates to underwater equipment, and more specifically, to an underwater three-section folding assembly and an underwater three-section folding antenna. Background Technology

[0002] Underwater equipment, constrained by its size, typically requires a retractable structure during design to facilitate transportation and deployment. Antenna equipment is a common type of marine equipment. During deployment, antenna modules need to be supported at a certain height, away from the sea surface or the equipment's mounting structure, to avoid signal interference from waves. Therefore, antenna equipment demands a high degree of flexibility in terms of the deployment / retraction ratio of the supporting structure. Currently, ordinary antenna equipment exhibits poor deployment / retraction performance, resulting in limited extended length and low reliability.

[0003] Currently, existing antennas are mainly spring-loaded telescopic rod type or pendulum two-section type. Spring-loaded telescopic antennas: After the upper equipment compartment is submerged, a solenoid valve controls a spring to pop out the antenna support. This requires additional control circuitry, the spring is prone to failure, the support rod is heavy and large, and an additional pop-out rail is needed, making overall installation and structural weight reduction design inconvenient. Pendulum two-section folding antennas: The support rod is relatively thick and long, the center of gravity is high during rotation and difficult to lock, the unfolding process requires a large buoyancy force to provide torque, it is prone to tilting, inconvenient to install, and easily damaged by collision with the glass casing during transportation.

[0004] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater three-section folding assembly, which aims to solve the problem of the antenna support automatically unfolding and locking after the equipment is deployed into the sea. The entire process is dominated by the buoyancy of the outer casing and the gravity of the lower section, and the torsion spring structure completes the self-locking, without the need for an additional electronic control unit.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an underwater three-section folding assembly, comprising a first rod, a second rod, and a third rod, wherein the first rod, the second rod, and the third rod are connected end to end in sequence by a hinge, wherein the hinge includes two connecting plates, and a rotating sleeve one and a rotating sleeve two are respectively fixed on the two connecting plates, and the rotating sleeve one and the rotating sleeve two are rotatably connected by a rotating shaft, wherein the hinge also includes a locking mechanism, which is used to lock and fix the two connecting plates after they are extended.

[0007] The invention is further configured such that the locking mechanism includes a support shaft, a locking block, and a torsion spring. The locking block is rotatably connected to a connecting plate on one side via the support shaft. The torsion spring is installed on the outer periphery of the support shaft and is used to elastically push the locking block against the rotating sleeve on the connecting plate on the other side. A locking recess is formed on the rotating sleeve, and a locking protrusion adapted to the locking recess is formed on the locking block. The locking protrusion is used to engage with the locking recess to lock and fix the two connecting plates.

[0008] The present invention is further configured such that a hinge is provided at the end of the first rod and the third rod opposite to the second rod.

[0009] The present invention also provides an underwater three-segment folding antenna, including a base plate, a mounting base, an antenna module, and three sets of the above-mentioned folding components. The upper part of the base plate is equipped with a base, and the base and the mounting base are connected by a retractable folding component. The antenna module is mounted on the mounting base.

[0010] The present invention is further configured such that the first rod of the folding assembly is hinged to the base via a hinge member, and the third rod is hinged to the mounting base via a hinge member.

[0011] The invention is further configured to include a floating cover, the top of which is closed and the bottom of which has an opening adapted to the base plate. The cover can be placed on the base plate to cover the mounting base, antenna module and folding assembly. A pin device is installed on the base, which is used to adapt to the cover and realize the closing and opening of the cover.

[0012] The invention is further configured to include a storage tube and a cable. The storage tube is fixed to the upper part of the mounting base and is used to store the cable. The two ends of the cable are respectively connected to the top of the inner side of the housing and the storage tube. After the pin device is opened, the cover floats upward. The cover pulls the mounting base and antenna module upward through the cable, and the folding component extends and locks in place.

[0013] The invention is further configured such that the rope can break after the folding assembly is extended and opened, and the rope includes a soluble segment that gradually dissolves and breaks upon contact with water.

[0014] The invention is further configured such that the storage tube has a hollow storage cavity, and a winding drum for winding the rope is fixedly connected to the bottom of the storage cavity. A through hole for the rope to extend is opened at the top of the storage tube. A sealing plate is provided in the middle of the inside of the winding drum. A protruding ring is formed at the bottom of the winding drum. The outer periphery of the sealing plate is embedded in the protruding ring and sealed by a sealing element, dividing the bottom of the winding drum into a waterproof and sealed cavity. A sealing sleeve with vertical penetration is fixed in the middle of the sealing plate. The rope passes through the sealing sleeve and forms a seal with the sealing sleeve. The end of the rope that extends into the sealed cavity is a soluble section, and a limiting protrusion larger than the inner diameter of the sealing sleeve is formed on the soluble end.

[0015] The invention is further configured such that a second protruding ring is provided on the upper inner circumference of the storage tube, and the edge of the sealing plate can slide up and down between the first and second protruding rings; a spring presses against the second protruding ring and the sealing plate; a through groove is provided on the side wall of the storage tube corresponding to the upper position of the first protruding ring, and an elastic sheet is connected in the through groove. The elastic sheet can elastically deform towards the inside of the storage tube and is opposite to the upper edge of the sealing plate, keeping the sealing plate pressed against the first protruding ring; a pressing block is fixedly connected to the outside of the elastic sheet, and the pressing block extends outward from the through groove to the outer circumference of the storage tube; when the rope is wound around the outer circumference of the winding drum, the winding pressure of the rope presses against the pressing block, which can elastically squeeze the elastic sheet inward, and the elastic sheet keeps the sealing plate pressed against the first protruding ring.

[0016] In summary, the present invention has the following beneficial effects:

[0017] By using three sets of folding components, the antenna module can be stably supported, and the three-point support structure ensures that the center of gravity of the antenna module and the entire device is always in the center position, thus improving the deployment stability of the antenna device.

[0018] By adopting a floating outer casing, the entire process of equipment deployment is dominated by the buoyancy of the outer casing and the gravity of the lower section, forming a vertical pull that enables the antenna equipment to open automatically and is self-locked by a torsion spring structure. No additional electrical control unit is required, which simplifies the antenna equipment and facilitates deployment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an underwater three-segment folding antenna in its folded state according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of an underwater three-segment folding antenna during its unfolding process according to the present invention;

[0021] Figure 3 This is a schematic diagram of the unfolded state of an underwater three-segment folding antenna according to the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of an underwater three-section folding assembly according to the present invention;

[0023] Figure 5 This is a perspective view of the hinge component of the present invention;

[0024] Figure 6 A cross-sectional view of the hinge component of the present invention. Figure 1 ;

[0025] Figure 7 A cross-sectional view of the hinge component of the present invention. Figure 2 ;

[0026] Figure 8 This is a schematic diagram of the structure of the storage tube and rope of the present invention.

[0027] Reference numerals: 1. Base plate; 2. Pin device; 21. Pin hole; 3. Cover; 4. Base; 5. Folding assembly; 6. Mounting base; 7. Storage tube; 8. Antenna module; 9. Rope; 91. Dissolvable section; 92. Limiting protrusion; 51. First rod; 52. Second rod; 53. Third rod; 54. Hinge; 541. Connecting plate; 542. Rotating sleeve one; 543. Rotating sleeve two; 544. Rotating shaft; 54 5. Locking mechanism; 546. Support shaft; 547. Locking block; 548. Locking protrusion; 549. Torsion spring; 550. Locking recess; 71. Receiving cavity; 72. Through hole; 73. Winding drum; 74. Sealing plate; 75. Sealing cavity; 76. Sealing ring; 77. First convex ring; 78. Sealing sleeve; 79. Edge; 710. Second convex ring; 711. Spring; 712. Through groove; 713. Elastic sheet; 714. Pressing block. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This embodiment discloses an underwater three-section folding assembly, such as... Figure 4-7 As shown, the folding assembly includes a first member 51, a second member 52, a third member 53, and a hinge 54. The first member 51, the second member 52, and the third member 53 are connected end-to-end via the hinge 54, forming a folding structure with both unfolded and folded states. In the folded state, the first member 51, the second member 52, and the third member 53 overlap, allowing the length of the folding assembly 5 to be shortened for easy storage. In the unfolded state, the first member 51, the second member 52, and the third member 53 rotate open, forming a nearly straight shape, thus providing support for objects and facilitating use.

[0030] like Figure 5-7As shown, the hinge 54 includes two connecting plates 541, each fixed to the end of a corresponding rod, serving as a connection. Rotating sleeve 1 542 and rotating sleeve 2 543 are fixed to the sides of the two connecting plates 541 that are close to each other. Rotating sleeve 1 542 and rotating sleeve 2 543 are rotatably connected by a rotating shaft 544, allowing the two connecting plates 541 to be rotatably adjustable. The hinge 54 also includes a locking mechanism 545, which locks the two connecting plates 541 in place after they are extended, thus locking the folding assembly 5 in the unfolded position.

[0031] The locking mechanism 545 specifically includes a support shaft 546, a locking block 547, and a torsion spring 549. The locking block 547 is rotatably connected to the two rotating sleeves 542 of the connecting plate 541 on one side via the support shaft 546, allowing the locking block 547 to swing. The torsion spring 549 is fitted around the outer periphery of the support shaft 546. By installing the two ends of the torsion spring 549 in appropriate positions, the locking block 547 can be elastically pushed against the rotating sleeves 543 on the connecting plate 541 on the other side under the action of the torsion spring 549.

[0032] A locking recess 550 is provided at an appropriate position on the outer periphery of the rotating sleeve 543. A locking protrusion 548 is formed on the locking block 547 to match the locking recess 550. The locking protrusion 548 can be inserted into the locking recess 550 to lock and fix the two connecting plates 541. Specifically, when the folding assembly 5 is in the folded state, the positions of the locking protrusion 548 and the locking recess 550 are offset from each other, the locking mechanism 545 is in the open state, and the hinge 54 can be smoothly rotated and adjusted; when the folding assembly 5 is rotated and adjusted to the unfolded state, the locking protrusion 548 is precisely embedded in the locking recess 550 and forms a rotation limit, so that the folding assembly 5 can be locked and fixed in the unfolded state.

[0033] To facilitate the installation of the folding assembly 5, a hinge 54 can be installed at the end of the first rod 51 and the third rod 53 that is away from the second rod 52. This makes the installation of the folding assembly 5 more convenient, as it can be installed directly through the hinge 54, thus facilitating the installation and use of the folding assembly 5.

[0034] This embodiment discloses an underwater three-segment folding antenna, such as Figure 1-4As shown, the antenna device includes a base plate 1, a mounting base 6, an antenna module 8, and three sets of folding components 5. The entire antenna device is supported by the base plate 1, on which a base 4 is installed. The mounting base 6 is located on top of the base 4, and the base 4 and the mounting base 6 are connected by retractable folding components 5. The antenna module 8 is installed on the mounting base 6. The folding components 5 allow the antenna module 8 to be folded, extended, and adjusted. Before deployment, the entire folding antenna device is an integrated structure. During deployment, the entire device is deployed as a whole. After being placed in the water, the cover separates from the device, the anchor device sinks, and the mounting device carrying the folding antenna moves upward under the action of buoyancy, allowing the folding antenna to unfold. The antenna module protrudes above the sea surface, maintaining a distance of 1.5m-2m from the sea surface to ensure that the antenna module operates in a non-underwater environment, reducing the impact of wave height caused by sea conditions and avoiding the attenuation of high-frequency signals by seawater.

[0035] The folding assembly 5 can adopt the structure described above, and the three sets of folding assemblies 5 are connected between the base 4 and the mounting base 6 to form an inwardly inclined tripod-like support structure, which can maintain a relatively stable support state.

[0036] When the folding assembly 5 is installed, the lower end of the first rod 51 is hinged to the base 4 via the hinge 54, and the third rod 53 is hinged to the lower side of the mounting base 6 via the hinge 54. This allows the folding assembly 5 to not only be relatively fixed after it is unfolded, but also to form a locking and fixing with the upper and lower bases 4 and mounting base 6, thereby maintaining a stable support structure for the antenna after it is unfolded.

[0037] Furthermore, the underwater three-section folding antenna also includes a cover 3. The cover 3 is made of a floating material, with a closed arc-shaped structure at the top and an opening at the bottom. The opening is adapted to the size of the base plate 1, so that the cover 3 can be placed on top of the base plate 1 to cover the mounting base 6, antenna module 8 and folding assembly 5 and other components. After the cover 3 is closed, it forms a complete whole, which can facilitate the transportation of the antenna equipment.

[0038] A pin device 2 is installed on the outer periphery of the base 4. The pin device 2 can be an electrically driven telescopic pin structure with a telescopic pin. A pin hole 21 is opened at a corresponding position on the outer periphery of the cover 3. The pins of each pin device 2 are inserted into the pin hole 21 to fix the cover 3 on the top of the base 4, which serves as a connection and allows the cover 3 to be closed and opened.

[0039] The underwater three-section folding antenna also includes a storage tube 7 and a cable 9. The cable 9 connects the mounting base 6 and the dome 3. The storage tube 7 is installed on the upper part of the mounting base 6 and can store the cable 9, keeping it in a regular and controllable state. After the pin device 2 is opened and the dome 3 is separated, the base 4 and other related components will sink under the gravity of the anchor device; after the dome 3 is separated, it will float up under the action of buoyancy. The dome 3 pulls the mounting base 6 and the antenna module 8 upward through the cable 9. At this time, pulling the hinge 54 in the folding assembly 5 will rotate, the folding assembly 5 will extend and lock in place, and the antenna assembly will unfold.

[0040] Furthermore, the structure of the storage tube 7 and the cable 9 can be optimized to facilitate the deployment of the antenna equipment. The cable 9 breaks automatically after the folding assembly 5 is extended, allowing the enclosure 3 to separate from the antenna module 8 and the base plate 1, preventing adverse effects from the enclosure 3. The cable 9 is made of a soluble material; when the enclosure 3 is opened, it will come into contact with water, gradually dissolving and decreasing in strength until it can no longer overcome the upward buoyancy of the enclosure 3, thus breaking and allowing the enclosure 3 to separate.

[0041] Furthermore, the storage tube 7 has a hollow storage cavity 71 inside, which can be used to store the rope 9, such as... Figure 8 As shown. A winding drum 73 is fixedly installed at the bottom of the storage cavity 71. The rope 9 can be wound around the outer periphery of the winding drum 73. The winding state can maintain a stable winding state of the rope 9, which is conducive to the laying of the rope 9. Furthermore, a through hole 72 is opened at the top of the storage drum 71 to allow the rope 9 to pass through smoothly.

[0042] like Figure 8 As shown, a sealing plate 74 is provided in the middle of the interior of the winding drum 73. A protruding ring 77 is formed at the bottom of the winding drum 73. The outer circumference of the sealing plate 74 is matched with the inner diameter of the protruding ring 77. A sealing ring 76 is installed between the sealing plate 74 and the protruding ring 77 to form a waterproof sealing structure. The sealing plate 74 can be stably adjusted and moved up and down within the winding drum 73. The sealing plate 74 divides the bottom of the winding drum 73 to form a waterproof and sealed cavity 75.

[0043] A vertically extending sealing sleeve 78 is fixed in the middle of the sealing plate 74. The sealing sleeve 78 is made of rubber sealing material. The rope 9 passes through the sealing sleeve 78 and forms a seal with it. After installation, a relatively stable seal can be maintained at the sealing sleeve 78. One end of the rope 9 that extends into the sealing cavity 75 is a soluble section 91, and a limiting protrusion 92 larger than the inner diameter of the sealing sleeve 78 is formed on the soluble section 91. The limiting protrusion 92 provides a locking and limiting state between the rope 9 and the sealing plate 74. During the pulling process, the rope 9 will generate an upward pulling force. Moreover, the soluble section 91 is connected to the bottom of the sealing cavity 75 by a lifting ring.

[0044] When the sealing plate 74 is subjected to an upward pulling force, the sealing plate 74 will detach from the convex ring 77, and the sealing cavity 75 will open to allow water to enter. After the sealing cavity 75 is filled with water, it will dissolve the soluble section 91 inside the sealing cavity 75. Then, the outer periphery of the dissolving end will gradually shrink and the strength will gradually decrease. The limiting protrusion 92 will not be able to form a locking linkage with the sealing plate 74, and it will not be able to resist the buoyancy of the outer cover. With the push over time, the outer cover will separate upward.

[0045] Furthermore, a second protruding ring 710 is formed on the upper inner circumference of the receiving cylinder 7. The edge 79 of the sealing plate 74 can slide up and down between the first protruding ring 77 and the second protruding ring 710. When the sealing plate 74 is separated from the inner side of the first protruding ring 77, the sealing cavity 75 will be connected to the external seawater environment, allowing seawater to enter. A spring 711 is elastically installed between the second protruding ring 710 and the sealing plate 74. Through the elastic action of the spring 711, the sealing plate 74 can be elastically limited downward, so that the sealing plate 74 can seal the sealing cavity 75 before deployment.

[0046] Furthermore, a through groove 712 can be opened on the side wall of the storage cylinder 7 at the upper position corresponding to the convex ring 77. The through groove 712 connects the inside and outside of the storage cylinder 7 to form a through channel. In addition, an elastic piece 713 is installed in the through groove 712. The elastic piece 713 has good elastic recovery. When subjected to external pressure, the elastic piece 713 can elastically deform towards the inside of the storage cylinder 7 and face the upper edge 79 of the sealing plate 74, keeping the sealing plate 74 pressed onto the convex ring 77.

[0047] A pressing block 714 is fixedly connected to the outside of the elastic sheet 713, and the pressing block 714 extends outward from the through groove 712 to the outer periphery of the storage cylinder 7. When the cable 9 is wound around the outer periphery of the winding cylinder 73, the winding pressure of the cable 9 presses against the pressing block 714, which can elastically squeeze the elastic sheet 713 inward. The elastic sheet 713 keeps the sealing plate 74 pressed against the protruding ring 77 and limited. Thus, before the antenna equipment is deployed, a stable winding binding force can be formed on the outer periphery of the winding cylinder 73, which can keep the sealing plate 74 stably pressed into the winding cylinder 73, keep the winding cylinder 73 in a stable state, avoid water leakage in the sealing cavity 75 and resulting in dissolution and damage, and thus maintain a more stable state of the antenna equipment.

[0048] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An underwater three-segment folding antenna, characterized in that, It includes a base plate (1), a mounting base (6), an antenna module (8), and three sets of folding components (5). The base plate (1) has a base (4) mounted on its upper part. The base (4) and the mounting base (6) are connected by a retractable folding component (5). The antenna module (8) is mounted on the mounting base (6). It also includes a floating cover (3), the top of which is closed and the bottom has an opening that fits the base plate (1). The cover (3) can be placed on the base plate (1) to cover the mounting base (6), antenna module (8) and folding assembly (5). A pin device (2) is installed on the base (4). The pin device (2) is used to fit with the cover (3) so that the cover (3) can be closed and opened. It also includes a storage tube (7) and a cable (9). The storage tube (7) is fixed to the upper part of the mounting base (6) and is used to store the cable (9). The two ends of the cable (9) are respectively connected to the top of the inner side of the housing and the storage tube (7). After the pin device (2) is opened, the cover (3) floats upward. The cover (3) pulls the mounting base (6) and the antenna module (8) upward through the cable (9). The folding component (5) extends and locks in place.

2. The underwater three-segment folding antenna according to claim 1, characterized in that, The folding assembly (5) includes a first rod (51), a second rod (52), and a third rod (53). The first rod (51), the second rod (52), and the third rod (53) are connected end to end in sequence by a hinge (54). The hinge (54) includes two connecting plates (541). A rotating sleeve one (542) and a rotating sleeve two (543) are respectively fixed on the two connecting plates (541). The rotating sleeve one (542) and the rotating sleeve two (543) are rotatably connected by a rotating shaft (544). The hinge (54) also includes a locking mechanism (545). The locking mechanism (545) is used to lock and fix the two connecting plates (541) after they are extended.

3. The underwater three-segment folding antenna according to claim 2, characterized in that, The locking mechanism (545) includes a support shaft (546), a locking block (547), and a torsion spring (549). The locking block (547) is rotatably connected to a connecting plate (541) on one side via the support shaft (546). The torsion spring (549) is installed on the outer periphery of the support shaft (546) and is used to elastically push the locking block (547) against the rotating sleeve (543) on the connecting plate (541) on the other side. A locking recess (550) is provided on the rotating sleeve (543), and a locking protrusion (548) is formed on the locking block (547) that is adapted to the locking recess (550). The locking protrusion (548) is used to engage with the locking recess (550) to lock and fix the two connecting plates (541).

4. The underwater three-segment folding antenna according to claim 2, characterized in that, The first member (51) and the third member (53) are provided with a hinge (54) at the end opposite to the second member (52).

5. The underwater three-segment folding antenna according to claim 1, characterized in that, The first member (51) of the folding assembly (5) is hinged to the base (4) via a hinge (54), and the third member (53) is hinged to the mounting base (6) via a hinge (54).

6. The underwater three-segment folding antenna according to claim 1, characterized in that, The rope (9) can break after the folding assembly (5) is extended and opened. The rope (9) includes a soluble section (91) that gradually dissolves and breaks when exposed to water.

7. The underwater three-segment folding antenna according to claim 1, characterized in that, The storage cylinder (7) has a hollow storage cavity (71) inside. A winding drum (73) for winding the rope (9) is fixedly connected to the bottom of the storage cavity (71). A through hole (72) for the rope (9) to extend is opened at the top of the storage cylinder (7). A sealing plate (74) is provided in the middle of the inside of the winding drum (73). A protruding convex ring (77) is formed at the bottom of the winding drum (73). The outer periphery of the sealing plate (74) is embedded in the convex ring (77). The sealing is achieved by a sealing element, which divides the bottom of the winding drum (73) to form a waterproof and sealed cavity (75); a sealing sleeve (78) that runs vertically through the middle of the sealing plate (74) is fixed, and the rope (9) passes through the sealing sleeve (78) and forms a seal with the sealing sleeve (78); one end of the rope (9) that extends into the sealing cavity (75) is a soluble section (91), and a limiting protrusion (92) larger than the inner diameter of the sealing sleeve (78) is formed on the soluble end.

8. An underwater three-segment folding antenna according to claim 7, characterized in that, The storage tube (7) has an inwardly protruding second convex ring (710) on its upper inner circumference. The edge (79) of the sealing plate (74) can slide up and down between the first convex ring (77) and the second convex ring (710). A spring (711) presses against the second convex ring (710) and the sealing plate (74). The side wall of the storage tube (7) has a through groove (712) corresponding to the upper position of the first convex ring (77). An elastic sheet (713) is connected in the through groove (712). The elastic sheet (713) can elastically deform towards the inside of the storage tube (7) and interact with the inner side of the storage tube (7). The upper edges (79) of the sealing plate (74) are opposite each other, keeping the sealing plate (74) pressed onto the first convex ring (77); the outer side of the elastic sheet (713) is fixedly connected to the pressing block (714), and the pressing block (714) extends outward from the through groove (712) to the outer periphery of the receiving cylinder (7); when the rope (9) is wound around the outer periphery of the winding cylinder (73), the winding pressure of the rope (9) presses against the pressing block (714), which can elastically squeeze the elastic sheet (713) inward, and the sealing plate (74) is kept in abutting and limited position against the first convex ring (77) by the elastic sheet (713).

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