Automobile shark fin antenna

Abstract

The invention discloses an automobile shark fin antenna, which comprises a shell, the top of the shell is in a double-shark fin shape, and a cavity is formed in the shell; the antenna is arranged between the two fins at the top of the shell, the bottom of the antenna is fixedly connected with a rotating shell, and the rotating shell is rotationally connected with the shell; the bistable mechanism is arranged in the shell, the bistable mechanism comprises a telescopic rod, the top end of the telescopic rod is fixedly connected with the outer wall of the rotating shell, and the bottom end of the telescopic rod is fixedly connected with a round rod; the top of the connecting plate is fixedly connected with the inner wall of the shell, an arc-shaped groove sliding with the round rod is formed in the connecting plate, a first cylinder is rotationally connected to the round rod, a second cylinder is rotationally connected to the position, under the rotating shell, of the shell, and a first spring piece is connected between the first cylinder and the second cylinder; the driving assembly is arranged in the shell, and the driving assembly is used for driving the rotating shell to move in the arc-shaped groove; and the damping device is arranged on the shell, and the damping device is used for reducing transverse low-frequency swing of the antenna.

Description

Technical Field

[0001] The invention relates to the technical field of antennas, and in particular to a shark fin antenna for an automobile. Background Art

[0002] The shark fin antenna is a small, streamlined vehicle-mounted antenna, named for its shape that resembles a shark's dorsal fin. It integrates multiple functions and usually supports AM / FM radio, GPS, 4G / 5G, Wi-Fi and other signal reception at the same time, replacing the traditional high pole antenna. The shark fin antenna has a compact design, which can not only effectively reduce air resistance and wind noise when driving at high speeds, but also has strong resistance to damage, reducing the risk of external impact. At the same time, it is more in line with the streamlined appearance of modern cars, improving the aesthetics of the entire vehicle; Existing shark fin antennas integrate multiple antenna functions, such as AM / FM radio, GPS, Bluetooth, Wi-Fi, and 4G / 5G signal reception, providing a more concise and efficient design. However, compared with traditional high pole antennas, shark fin antennas may have weaker signal reception capabilities in some scenarios (such as long-range AM radio reception), so they may not perform as well as high pole antennas in remote areas or environments with weak signals.

[0003] To this end, we propose an automotive shark fin antenna. Summary of the invention

[0004] The purpose of the present invention is to provide a shark fin antenna for a car to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a shark fin antenna for a car, comprising: A shell, the top of which is in the shape of a double shark fin, and a cavity is formed in the shell; An antenna, the antenna is arranged between the double fins on the top of the shell, the bottom of the antenna is fixedly connected to a rotating shell, and the rotating shell is rotatably connected to the shell; A bistable mechanism, wherein the bistable mechanism is disposed in the housing and comprises: A telescopic rod, the top end of which is fixedly connected to the outer wall of the rotating shell, and the bottom end of which is fixedly connected to a round rod; A connecting plate, the top of which is fixedly connected to the inner wall of the shell, an arc-shaped groove is provided on the connecting plate for sliding with the round rod, a cylinder 1 is rotatably connected to the round rod, the shell is located directly below the rotating shell and is rotatably connected to the cylinder 2, and a spring member 1 is connected between the cylinders 1 and 2; A driving assembly, the driving assembly is disposed in the housing, and the driving assembly is used to drive the rotating shell to move in the arc groove; A damping device is arranged on the shell and is used to reduce the lateral low-frequency swing of the antenna.

[0005] Preferably, the driving assembly comprises: A slide rail, the slide rail is fixedly connected to the bottom of the shell, a pushing member is slidably connected to the slide rail, the pushing member is L-shaped, the pushing member abuts against a cylinder 1, a threaded rod is connected to the internal thread of the pushing member, both ends of the threaded rod are rotatably connected to the shell, a motor 1 is arranged at one end of the threaded rod, the shell of the motor 1 is fixedly connected to the shell, a gear 1 is fixedly connected to the end of the internal rotating shaft of the motor 1, a gear 2 is meshed on one side of the gear 1, and the gear 2 is fixedly connected to the end of the threaded rod.

[0006] Preferably, a connecting ear 1 is fixedly connected to the pushing member, a connecting ear 2 is rotatably connected inside the round rod, and a connecting rope is connected between the connecting ear 1 and the connecting ear 2.

[0007] Preferably, the damping device comprises: A connecting wire, one end of which is connected to the top of the antenna and the other end of which is connected to the shell, a damping element is arranged on the connecting wire, and the connecting wire is made of a flexible but non-deformable material.

[0008] Preferably, the damping element is made of high-density material, and the damping element is composed of a circular array of multiple arc-shaped elements.

[0009] Preferably, the damping member is slidably connected to the connecting line, a petal member is fixedly connected to the top of the damping member, a fixing cap is threadedly connected to the outer wall of the petal member, and the petal member adjusts its relative position with the connecting line through the fixing cap to achieve a limiting or locking function.

[0010] Preferably, a tensioning assembly is provided in the housing, and the tensioning assembly comprises: A tensioning wheel, the surface of which is in contact with the connecting wire, a driving rod is rotatably connected inside the tensioning wheel, a sliding groove is provided on the upper side of the shell, a wire groove connected to the sliding groove is provided on the top of the shell, and a rotating device for driving the driving rod to move in the sliding groove is provided in the shell.

[0011] Preferably, the rotating device comprises: A winding rod, the winding rod is rotatably connected to the shell, a winding rope is arranged between the winding rod and the driving rod, one end of the winding rope is fixedly connected to the driving rod and the other end is fixedly connected to the surface of the winding rod, the shell is provided with motor 2 on one side of the winding rod, the end of the internal rotating shaft of the motor 2 is fixedly connected to gear 3, one side of the gear 3 is meshed with gear 4, and the gear 4 is fixedly connected to the end of the winding rod.

[0012] The present invention has at least the following beneficial effects: When the car is traveling at a low speed, the drive assembly pushes the cylinder to drive the round rod to move in the arc groove, the telescopic rod extends, and the spring component stores elastic potential energy. When the round rod reaches the lowest end, the spring component releases kinetic energy, driving the round rod to continue moving until the antenna is erected on the shell, adapting to low-frequency, AM broadcasting. When the car is traveling at a high speed, the antenna drives the rotating shell to rotate under the action of wind. If the resistance is greater than the pulling force of the spring component, the shell drives the telescopic rod to rotate, and the spring component releases energy to reset the round rod, and the antenna is stored in the shell, reducing wind resistance and fuel consumption. When the car is running at high speed, the antenna increases the wind resistance and is easy to break. The driver can start the motor 1 to drive the pusher to move along the slide rail away from the round rod. The connecting ear 1 on the pusher pulls the connecting ear 2 through the connecting rope, and then pulls the round rod to move in the arc groove until the round rod reaches the other end of the arc groove. At this time, the antenna is flush with the top of the shell, the overall wind resistance is reduced, and the fuel consumption of the car running at high speed is reduced. When the vehicle is traveling at a low speed, the driver can control the driving component to drive the antenna to rise. The vehicle may shake during driving, and the antenna will swing under the drive of the car, which is mainly manifested as the swing of the connection point at the bottom of the antenna. The connecting wire and the damping member can provide reverse tension and inertia to reduce the swing. The weight of the damping member introduces an inertial effect to the system, slowing down the swing speed of the top of the antenna and playing a buffering role. By designing the damping parts into arc-shaped parts with a circumference composed together, the middle of the design is hollow, which can reduce wind resistance to a certain extent; The moving range of the round rod in the arc groove can be blocked by changing the position of the pushing member in the arc groove. Then, when the tensioning wheel is driven by the rotating device to pull the antenna, the rotating shell at the bottom of the antenna rotates, and the round rod on the rotating shell can only rotate to a certain angle under the restriction of the pushing member. Therefore, the stress on the bottom of the antenna is reduced to a certain extent while keeping the antenna in an unfolded state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another viewing angle of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the bistable mechanism of the present invention; Figure 4 It is a schematic diagram of the side cross-sectional structure of the present invention; Figure 5 It is a schematic diagram of the explosion structure of the present invention; Figure 6 For the present invention Figure 4 The enlarged structural diagram of part A in the middle; Figure 7 It is a schematic diagram of the enlarged structure of the damping element of the present invention; Figure 8 It is a schematic diagram of the structure of the tensioning assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the rotating device of the present invention.

[0014] In the figure: 10, housing; 20, antenna; 21, rotating housing; 22, bistable mechanism; 221, telescopic rod; 222, round rod; 223, connecting plate; 224, arc groove; 225, cylinder 1; 226, cylinder 2; 227, spring member 1; 30, driving assembly; 31, slide rail; 32, push member; 33, threaded rod; 34, motor 1; 35, gear 1; 36, gear 2; 321, connecting ear 1; 322, connecting ear 2; 323, connecting rope; 40, damping device; 41, connecting line; 42, damping member; 421, petal member; 422, fixing cap; 50, tensioning assembly; 51, tensioning wheel; 52, driving rod; 53, slide groove; 55, wire groove; 541. Winding rod; 542. Winding rope; 543. Motor 2; 544. Gear 3; 545. Gear 4; 54. Rotating device. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In order to better understand the shark fin antenna for automobiles provided in the embodiment of the present application, the existing shark fin antenna for automobiles is briefly introduced below. When installing most shark fin antennas, it is necessary to remove the original antenna, and then connect the cable inside the shark fin to the receiving end on the top of the car to complete the replacement. The signal receiving range of the car without the original antenna is limited; The following is a brief overview of the present application. By setting the antenna in the middle of the double shark fins and cooperating with the bistable mechanism 22, the antenna can be controlled to be close to the surface of the shell 10 or to stand upright on the shell 10. When driving at high speed, the antenna can be folded up to reduce fuel consumption, and when driving at low speed, the antenna can be opened to receive more signals.

[0017] Example 1: Please refer to Figure 1-9 The present invention provides a technical solution: a shark fin antenna for a car, comprising: A housing 10, wherein the top of the housing 10 is in the shape of a double shark fin, a cavity is provided in the housing 10, and the bottom of the housing 10 is fixedly connected to the roof of the automobile; The antenna 20 is disposed between the double fins at the top of the housing 10. A rotating shell 21 is fixedly connected to the bottom of the antenna 20. The rotating shell 21 is rotatably connected to the housing 10. The antenna 20 is electrically connected to a signal receiving end at the top of the vehicle through a cable. The bistable mechanism 22 is disposed in the housing 10 and includes: A telescopic rod 221, the top end of which is fixedly connected to the outer wall of the rotating shell 21, and the bottom end of which is fixedly connected to a round rod 222; A connecting plate 223, the top of which is fixedly connected to the inner wall of the housing 10, an arc groove 224 is provided on the connecting plate 223 for sliding with the round rod 222, a cylinder 1 225 is rotatably connected to the round rod 222, the housing 10 is located directly below the rotating shell 21 and is rotatably connected to a cylinder 226, a spring 1 227 is connected between the cylinder 1 225 and the cylinder 2 226; It should be noted that when the car is traveling at a low speed, the driving assembly 30 drives the round rod 222 to move in the arc groove 224 in the connecting plate 223 by pushing the cylinder 1 225. During the movement, the telescopic rod 221 is extended in cooperation with the round rod 222 and the arc groove 224, and the spring member 1 227 is also extended to generate elastic potential energy. When the round rod 222 passes the lowest end of the arc groove 224 on the connecting plate 223, the spring member 1 227 converts the elastic potential energy into kinetic energy to drive the round rod 222 in the cylinder 1 225 to move along the arc groove 224 until the round rod 222 abuts against the end of the arc groove 224 of the connecting plate 223. At this time, the antenna 20 will be erected on the housing 1 0, the antenna 20 erected on the top of the housing 10 will adapt to low frequency, AM, and radio broadcasts. When the car is traveling at high speed, if the driver forgets to store the antenna 20 through the driving assembly 30, the antenna 20 on the top of the high-speed car will drive the rotating shell 21 to rotate under the influence of wind. When the resistance to the antenna 20 is greater than the pulling force of the spring member 227, the rotating shell 21 drives the telescopic rod 221 to rotate until the telescopic rod 221 passes the lowest end of the arc groove 224. The elastic potential energy of the spring member 227 is converted into kinetic energy to drive the round rod 222 to reset, thereby storing the antenna 20 on the housing 10. After the antenna 20 is stored, the wind resistance of the entire device is reduced, thereby reducing fuel consumption; A driving assembly 30, wherein the driving assembly 30 is disposed in the housing 10, and the driving assembly 30 is used to drive the rotating shell 21 to move in the arc groove 224; The damping device 40 is disposed on the housing 10 , and is used to reduce the lateral low-frequency swing of the antenna 20 .

[0018] Further Figure 3 , Figure 4and Figure 5 As shown, it is worth to explain in detail that the driving assembly 30 includes: A slide rail 31, the slide rail 31 is fixedly connected to the bottom of the housing 10, a pusher 32 is slidably connected to the slide rail 31, the pusher 32 is L-shaped, the pusher 32 abuts against the cylinder 1 225, the pusher 32 is internally threadedly connected to a threaded rod 33, both ends of the threaded rod 33 are rotatably connected to the housing 10, a motor 1 34 is provided at one end of the threaded rod 33, the housing of the motor 1 34 is fixedly connected to the housing 10, a gear 1 35 is fixedly connected to the end of the internal rotating shaft of the motor 1 34, a gear 2 36 is meshed on one side of the gear 1 35, and the gear 2 36 is fixedly connected to the end of the threaded rod 33; It should be noted that by starting motor 1 34 , gear 1 35 at the end of the internal rotating shaft of motor 1 34 drives gear 2 36 to rotate, and gear 2 36 drives the threaded rod 33 fixedly connected thereto to rotate, and the pushing member 32 can move along the direction of the slide rail 31 under the restriction of the slide rail 31 and the threaded rod 33.

[0019] Further as Figure 6 As shown, it is worth to explain in detail that the pusher 32 is fixedly connected with a connecting ear 1 321, the round rod 222 is rotatably connected with a connecting ear 2 322, and a connecting rope 323 is connected between the connecting ear 1 321 and the connecting ear 2 322; It should be noted that when the car is traveling at high speed, the antenna 20 increases the wind resistance and is easy to break. The driver can start the motor 1 34 to drive the pusher 32 to move along the slide rail 31 away from the round rod 222. The connecting ear 1 321 on the pusher 32 pulls the connecting ear 2 322 through the connecting rope 323, thereby pulling the round rod 222 to move in the arc groove 224 until the round rod 222 reaches the other end of the arc groove 224. At this time, the antenna 20 is flush with the top of the shell 10, the overall wind resistance is reduced, and the fuel consumption of the car traveling at high speed is reduced.

[0020] Further as Figure 2 , Figure 4 and Figure 5 As shown, it is worth to explain in detail that the damping device 40 includes: A connecting wire 41, one end of which is connected to the top of the antenna 20 and the other end of which is connected to the housing 10. A damping member 42 is provided on the connecting wire 41. The connecting wire 41 is made of a flexible but non-deformable material. The connecting wire 41 can be made of a fishing line, a braided nylon rope or a metal wire rope; It should be noted that when the vehicle is traveling at a low speed, the driver can control the driving assembly 30 to drive the antenna 20 to rise. The vehicle may shake during driving, and the antenna 20 will swing when driven by the car, which is mainly manifested as the swing of the connection point at the bottom of the antenna 20. The connecting line 41 and the damping member 42 can provide reverse tension and inertia to reduce the swing. The weight of the damping member 42 introduces an inertial effect into the system, slowing down the swinging speed of the top of the antenna 20 and playing a buffering role.

[0021] Further Figure 2 , Figure 3 and Figure 7 As shown, it is worth to explain in detail that the damping member 42 is made of high-density material, the damping member 42 is composed of a circular array of multiple arc-shaped members, and the damping member 42 is a lead ball; It should be noted that by designing the damping member 42 to be an arc-shaped member with its circumference formed together, such a design has a hollow middle, which reduces wind resistance to a certain extent.

[0022] Further Figure 7 As shown, it is worth to explain in detail that the damping member 42 is slidably connected with the connecting line 41, a petal member 421 is fixedly connected to the top of the damping member 42, and a fixing cap 422 is threadedly connected to the outer wall of the petal member 421, and the petal member 421 adjusts its relative position with the connecting line 41 through the fixing cap 422 to realize the limiting or locking function; It should be noted that the petal member 421 can be separated from the connecting line 41 by rotating the fixing cap 422, and the damping member 42 can be moved on the connecting line 41; It is worth noting that the damping member 42 should be hung at a distance between one-half and two-thirds from the top of the antenna 20. This position can balance the direct pulling force on the swing of the antenna 20 and the dynamic damping effect of the system.

[0023] According to the above embodiment, this solution also has embodiment 2, please refer to Figure 8 and Fig. 9 : A tensioning assembly 50 is disposed in the housing 10, and the tensioning assembly 50 includes: A tension wheel 51, the surface of which is in contact with the connecting wire 41, a driving rod 52 is rotatably connected inside the tension wheel 51, a slide groove 53 is provided on the upper side of the housing 10, a wire groove 55 connected to the slide groove 53 is provided on the top of the housing 10, and a rotating device 54 for driving the driving rod 52 to move in the slide groove 53 is provided inside the housing 10; It should be noted that when the car is traveling at a high speed and needs to receive more signals, the driver can drive the pusher 32 to move to the lowest point of the arc groove 224 of the connecting plate 223 through the motor 1 34, and then drive the driving rod 52 to move along the slide groove 53 through the rotating device 54, and the driving rod 52 drives the tensioning wheel 51 to move along the slide groove 53. As the tensioning wheel 51 moves, the connecting wire 41 pulls the antenna 20 to bend along the direction of the wire groove 55. At this time, the angle between the antenna 20 and the roof is reduced, and the antenna 20 and the connecting wire 41 are more stable as a whole, not easy to shake, and the signal is prevented from being interfered with as much as possible; It is worth noting that the movement range of the round rod 222 in the arc groove 224 can be blocked by changing the position of the pushing member 32 in the arc groove 224. When the tensioning wheel 51 is driven by the rotating device 54 to pull the antenna 20, the rotating shell 21 at the bottom of the antenna 20 rotates. The round rod 222 on the rotating shell 21 can only rotate to a certain angle under the restriction of the pushing member 32, thereby reducing the stress on the bottom of the antenna 20 to a certain extent while keeping the antenna 20 in an expanded state.

[0024] Further as Figure 8 and Fig. 9 As shown, it is worth to explain in detail that the rotating device 54 includes: A winding rod 541, the winding rod 541 is rotatably connected to the housing 10, a winding rope 542 is provided between the winding rod 541 and the driving rod 52, one end of the winding rope 542 is fixedly connected to the driving rod 52 and the other end is fixedly connected to the surface of the winding rod 541, the housing 10 is provided with a second motor 543 at one side of the winding rod 541, a third gear 544 is fixedly connected to the end of the internal rotating shaft of the second motor 543, a fourth gear 545 is meshed with one side of the third gear 544, and the fourth gear 545 is fixedly connected to the end of the winding rod 541; It should be noted that by starting motor 2 543, gear 3 544 at the end of the internal rotating shaft of motor 2 543 drives gear 4 545 to rotate, and gear 4 545 drives the winding rod 541 fixedly connected thereto to rotate, and the winding rod 541 can pull the driving rod 52 to move by winding the winding rope 542.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although 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 the embodiments without departing from the principles and spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A shark fin antenna for a car, comprising: A shell (10), wherein the top of the shell (10) is in the shape of a double shark fin, and a cavity is provided inside the shell (10); Features: An antenna (20), the antenna (20) being arranged between the double fins at the top of the housing (10), the bottom of the antenna (20) being fixedly connected to a rotating housing (21), the rotating housing (21) being rotatably connected to the housing (10); A bistable mechanism (22), wherein the bistable mechanism (22) is arranged in the housing (10), and the bistable mechanism (22) comprises: A telescopic rod (221), the top end of the telescopic rod (221) being fixedly connected to the outer wall of the rotating shell (21), and the bottom end of the telescopic rod (221) being fixedly connected to a round rod (222); A connecting plate (223), the top of the connecting plate (223) being fixedly connected to the inner wall of the shell (10), the connecting plate (223) being provided with an arcuate groove (224) for sliding with the round rod (222), the round rod (222) being rotatably connected to a first cylinder (225), the shell (10) being located directly below the rotating shell (21) and being rotatably connected to a second cylinder (226), and a first spring member (227) being connected between the first cylinder (225) and the second cylinder (226); A driving assembly (30), the driving assembly (30) being disposed in the housing (10), and the driving assembly (30) being used to drive the rotating shell (21) to move in the arc-shaped groove (224); A damping device (40) is arranged on the housing (10), and is used to reduce lateral low-frequency swing of the antenna (20).

2. The shark fin antenna for automobile according to claim 1, characterized in that: The driving assembly (30) comprises: A slide rail (31), the slide rail (31) is fixedly connected to the bottom of the shell (10), a pusher (32) is slidably connected to the slide rail (31), the pusher (32) is L-shaped, the pusher (32) is in contact with the cylinder (225), the pusher (32) is internally threadedly connected to a threaded rod (33), both ends of the threaded rod (33) are rotatably connected to the shell (10), a motor (34) is provided at one end of the threaded rod (33), the shell of the motor (34) is fixedly connected to the shell (10), a gear (35) is fixedly connected to the end of the internal rotating shaft of the motor (34), a gear (36) is meshed on one side of the gear (35), and the gear (36) is fixedly connected to the end of the threaded rod (33).

3. The shark fin antenna for automobile according to claim 2, characterized in that: A first connecting ear (321) is fixedly connected to the pushing member (32), a second connecting ear (322) is rotatably connected inside the round rod (222), and a connecting rope (323) is connected between the first connecting ear (321) and the second connecting ear (322).

4. The shark fin antenna for automobile according to claim 3, characterized in that: The damping device (40) comprises: A connecting wire (41), one end of the connecting wire (41) is connected to the top of the antenna (20) and the other end is connected to the housing (10), a damping member (42) is provided on the connecting wire (41), and the connecting wire (41) is made of a flexible but non-deformable material.

5. The automotive shark fin antenna according to claim 4, characterized in that: The damping member (42) is made of a high-density material, and the damping member (42) is composed of a circular array of multiple arc-shaped members.

6. The shark fin antenna for automobile according to any one of claims 4 or 5, characterized in that: The damping member (42) is slidably connected to the connecting line (41); a petal member (421) is fixedly connected to the top of the damping member (42); a fixing cap (422) is threadedly connected to the outer wall of the petal member (421); the petal member (421) adjusts its relative position with the connecting line (41) through the fixing cap (422) to achieve a limiting or locking function.

7. The automotive shark fin antenna according to claim 4, characterized in that: A tensioning assembly (50) is disposed in the housing (10), and the tensioning assembly (50) comprises: A tensioning wheel (51), the surface of the tensioning wheel (51) abuts against the connecting line (41), a driving rod (52) is rotatably connected inside the tensioning wheel (51), a sliding groove (53) is provided on the upper side of the shell (10), a wire groove (55) connected to the sliding groove (53) is provided on the top of the shell (10), and a rotating device (54) for driving the driving rod (52) to move in the sliding groove (53) is provided inside the shell (10).

8. The automotive shark fin antenna according to claim 7, characterized in that: The rotating device (54) comprises: A winding rod (541), the winding rod (541) being rotatably connected to the housing (10), a winding rope (542) being arranged between the winding rod (541) and the driving rod (52), one end of the winding rope (542) being fixedly connected to the driving rod (52) and the other end being fixedly connected to the surface of the winding rod (541), the housing (10) being arranged with a second motor (543) on one side of the winding rod (541), a third gear (544) being fixedly connected to the end of the internal rotating shaft of the second motor (543), a fourth gear (545) being meshed with one side of the third gear (544), and the fourth gear (545) being fixedly connected to the end of the winding rod (541).

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