Camera anti-swing support structure of communication tower

Abstract

The invention relates to the technical field of communication tower cameras, and provides a communication tower camera anti-swing support structure which comprises a support and a fixing rod. According to the technical scheme, the driving force of the motor drives the rotating disc, the circular groove, the sliding groove, the sliding rod, the sliding rail, the sliding block, the moving plate, the limiting block, the vacuum block, the abutting block and other assemblies to be matched with one another, the motor penetrating through the bottom of the fixing plate is started, and therefore the rotating disc fixed to the output shaft is driven to slide on the inner wall of the circular groove; when the sliding groove moves and a sliding rod sliding at the bottom of the inner wall slides, a moving plate fixed to the top of a sliding block is stressed, meanwhile, the sliding block sliding at the top of a sliding rail is driven to slide to do linear motion, and therefore a limiting block fixed to the side face of the moving plate is driven to move. When the camera is applied to the communication tower, the image quality is prevented from being influenced when the communication tower is impacted and shaken, and the problem of the camera of the communication tower in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of communication tower cameras, and in particular to an anti-sway support structure for a camera of a communication tower. Background Art

[0002] In modern communication systems, communication towers, as key infrastructure, undertake a large number of signal transmission tasks. In order to ensure the stability and quality of the signal, multiple cameras and other monitoring equipment are usually installed on the communication tower for real-time monitoring and data collection. However, due to the influence of factors such as height and wind, communication towers often face a certain degree of swing and vibration, which may cause the image quality of the camera to deteriorate and affect the stability and service life of the equipment. The camera is usually installed at a high position on the communication tower. It is disturbed by factors such as wind, temperature difference, and tower vibration, which makes the camera often sway, shake and other unstable phenomena. This swing will cause the camera to be unable to capture images stably. In severe cases, it may cause image blur, offset, or even damage the camera and its supporting structure. Therefore, how to design a support structure that can effectively prevent the camera from swinging has become an important issue to improve monitoring quality and equipment safety.

[0003] According to a camera disclosed (publication number: CN109361838A), it includes a shell, an inclined plate, a cylinder, a piston rod, a fan and a camera are arranged in the shell, the cylinder is arranged on the right side wall of the shell, the piston rod is arranged on the left side of the cylinder, the camera is arranged on the left side of the piston rod, the fan is arranged on the top of the shell, an inclined plate is arranged below the cylinder, an ash discharge port is arranged at the lower right end of the shell, a sensor, an opening and a transparent protective cover are arranged on the left side wall of the shell, the opening is arranged in the middle of the left side wall of the shell, a sensor is arranged below the opening, a transparent protective cover is arranged above the opening, and a heater is arranged on the inner wall of the transparent protective cover. However, in the above design, when the camera is used on a communication tower, the camera shakes at the same time when the communication tower is impacted, thereby affecting the camera quality, which needs to be improved. Summary of the invention

[0004] The present invention proposes a camera anti-sway support structure for a communication tower, which solves the problems raised in the above documents.

[0005] The technical solution of the present invention is as follows: it comprises a bracket and a fixing rod, the fixing rod is fixedly connected to the top of the bracket, the end of the fixing rod away from the bracket is fixedly connected to a supporting plate, the top of the supporting plate is provided with a camera assembly, the top of the bracket is provided with an anti-swing assembly, the anti-swing assembly comprises a fixing plate, the fixing plate is fixedly connected to the bottom of the bracket, a motor passes through the bottom of the fixing plate, a turntable is fixedly connected to the end of the output shaft of the motor, a circular groove is provided on the top of the bracket, a sliding groove is provided on the top of the turntable, a slide rail is fixedly connected to the top of the slide rail, a slider is slidably connected to the top of the slider, a moving plate is fixedly connected to the top of the slider, a limiting block is fixedly connected to the side of the moving plate, and a sliding rod is fixedly connected to the bottom of the moving plate.

[0006] A vacuum block is fixedly connected to the side of the limit block, and a resistance block is fixedly connected to the inner wall of the vacuum block. The design of the resistance block is conducive to limiting the camera assembly when the resistance block contacts the camera assembly.

[0007] The side cross-section of the vacuum block is set to be concave, the resistance block contacts the circumferential surface of the camera assembly, the slide rod is slidably connected to the bottom of the inner wall of the slide groove, and the side cross-section of the slide groove is set to be arc-shaped. When the slide rod slides at the bottom of the inner wall of the slide groove, it drives the slider to make a linear motion at the top of the slide rail.

[0008] A buffer mechanism is provided at the bottom of the bracket, and the buffer mechanism includes a first hollow plate, the first hollow plate is fixedly connected to the bottom of the bracket, the bottom of the first hollow plate is fixedly connected to a spring, the end of the spring away from the first hollow plate is fixedly connected to a buffer frame, the top of the inner wall of the first hollow plate is fixedly connected to a concave block, the inner side wall of the concave block is rotatably connected to a fixed shaft, and the circumferential surface of the fixed shaft is fixedly connected to a support rod. The above design is beneficial for the spring to buffer the camera assembly when the communication tower shakes up and down.

[0009] A second hollow plate is fixedly connected to the bottom of the buffer frame, a return spring is fixedly connected to the inner wall of the second hollow plate, an end of the return spring away from the second hollow plate is fixedly connected to a support block, and a rectangular block is fixedly connected to the top of the support block, so that the camera assembly is buffered when the communication tower shakes left and right.

[0010] The rectangular block is slidably connected to the bottom of the inner wall of the second hollow plate, the support rod is fixedly connected to the side of the buffer frame, and the initial state of the spring is set to a relaxed state. The above design is conducive to preventing the camera assembly from being affected by impact force.

[0011] A protective mechanism is provided on the top of the turntable, and the protective mechanism includes a connecting shaft, which is fixedly connected to the top of the turntable, a hollow block is fixedly connected to the top of the bracket, a torsion spring rod is rotatably connected to the inner wall of the hollow block, a sleeve is fixedly connected to the circumferential surface of the torsion spring rod, a hinge plate is fixedly connected to the circumferential surface of the sleeve, and a protective plate is fixedly connected to the bottom of the hinge plate. The above design is conducive to preventing excessive wind speed from affecting the shooting efficiency of the camera assembly.

[0012] The circumferential surface of the connecting shaft is fixedly connected with a transmission gear, the top of the bracket is fixedly connected with a vertical plate, the side of the vertical plate is rotatably connected with a reciprocating screw rod, the circumferential surface of the reciprocating screw rod is threadedly connected with a reciprocating wire sleeve, the circumferential surface of the reciprocating screw rod is fixedly connected with a connecting gear, the side of the vertical plate is fixedly connected with a limiting rod, the front side of the reciprocating wire sleeve is fixedly connected with a push rod, and the bottom of the protective plate is fixedly connected with a positioning plate. The above design is conducive to adjusting the protective plate to a vertical state, thereby protecting the camera assembly.

[0013] The side cross-section of the push rod is set to be L-shaped, the push rod is in contact with the bottom of the protective plate, the transmission gear and the connecting gear are both set to be bevel gears, the transmission gear and the connecting gear are meshed with each other, the side cross-section of the reciprocating wire sleeve is set to be rectangular, and the reciprocating wire sleeve is slidably connected to the circumferential surface of the limit rod. The above design is conducive to making the reciprocating wire sleeve perform linear reciprocating motion.

[0014] The working principle and beneficial effects of the present invention are: 1. In the present invention, the driving force of the motor drives the components such as the turntable, circular groove, slide groove, slide rod, slide rail, slider, moving plate, limit block, vacuum block, and resistance block to cooperate with each other, thereby starting the motor running through the bottom of the fixed plate, thereby driving the turntable fixed on the output shaft to slide on the inner wall of the circular groove, and at the same time driving the slide groove provided on the top of the turntable to make a circular motion. When the slide groove moves, the slide rod sliding on the bottom of the inner wall slides, so that the moving plate fixed on the top of the slider is subjected to force, and at the same time drives the slider sliding on the top of the slide rail to slide and make a linear motion, thereby driving the limit block fixed on the side of the moving plate to move. When the camera is applied to a communication tower, it prevents the communication tower from being impacted and shaken to affect the image quality.

[0015] 2. In the present invention, the expansion and contraction force of the reset spring drives the first hollow plate, spring, buffer frame, second hollow plate, reset spring, rectangular block, support block, support rod, concave block, fixed shaft and other components to cooperate with each other, so that when the bracket is shaken up and down, the spring fixed at the bottom of the first hollow plate contracts according to its own elasticity, and at the same time drives the support rod fixed on the circumferential surface of the fixed shaft to be stressed, thereby driving the fixed shaft to rotate. The rotation of the fixed shaft drives the support rod to make an arc movement. When the communication tower is affected by the impact force, the impact of the impact force on the camera is reduced.

[0016] 3. In the present invention, the rotational force of the turntable drives the connecting shaft, transmission gear, vertical plate, reciprocating screw, connecting gear, limit rod, reciprocating wire sleeve, push rod, hollow block, torsion spring rod, sleeve, hinged plate and other components to cooperate with each other, so that when the turntable rotates, the connecting shaft fixed on the top is driven to rotate, which drives the transmission gear fixed on the circumferential surface to rotate, and at the same time drives the mutually meshing connecting gears to rotate. The rotation of the connecting gear drives the reciprocating screw rotating on the side of the vertical plate to rotate, thereby driving the reciprocating wire sleeve threadedly connected to the circumferential surface to slide on the circumferential surface of the limit rod, so that the reciprocating wire sleeve makes a linear motion. When the camera is shooting, the camera is protected to prevent the camera from shaking due to excessive speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure at the bottom of the bracket of the present invention; Figure 3 This is a schematic diagram of the three-dimensional display structure of the turntable of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the return spring of the present invention; Figure 5 This is a schematic diagram of the three-dimensional display structure of the protective plate of the present invention; Figure 6 It is a schematic diagram of the three-dimensional display structure of the reciprocating screw rod of the present invention; Figure 7 For the present invention Figure 4 A is a schematic diagram of the enlarged three-dimensional structure; Figure 8 For the present invention Figure 5 Schematic diagram of the enlarged three-dimensional structure of B; Fig. 9 For the present invention Figure 5 Schematic diagram of the enlarged three-dimensional structure of C in the figure.

[0019] In the figure: 1, bracket; 2, fixing rod; 3, support plate; 4, camera assembly; 5, anti-swing assembly; 51, fixing plate; 52, motor; 53, round groove; 54, slide groove; 55, slide rod; 56, slide rail; 57, slider; 58, moving plate; 59, limit block; 510, vacuum block; 511, resistance block; 512, turntable; 6, buffer mechanism; 61, first hollow plate; 62, spring; 63, buffer frame; 64, second hollow plate; 65 , reset spring; 66, rectangular block; 67, support block; 68, support rod; 69, concave block; 610, fixed shaft; 7, protection mechanism; 71, connecting shaft; 72, transmission gear; 73, vertical plate; 74, reciprocating screw rod; 75, connecting gear; 76, limit rod; 77, reciprocating screw sleeve; 78, push rod; 79, hollow block; 710, torsion spring rod; 711, sleeve; 712, hinged plate; 713, protection plate; 714, positioning plate. DETAILED DESCRIPTION

[0020] The following will be combined with 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.

[0021] Example 1 like Figure 1 to Figure 9 As shown, this embodiment proposes an anti-swing support structure for a camera of a communication tower, comprising a bracket 1 and a fixing rod 2, wherein the fixing rod 2 is fixedly connected to the top of the bracket 1, and one end of the fixing rod 2 away from the bracket 1 is fixedly connected to a supporting plate 3, and a camera assembly 4 is arranged on the top of the supporting plate 3, and an anti-swing assembly 5 is arranged on the top of the bracket 1, and the anti-swing assembly 5 comprises a fixing plate 51, and the fixing plate 51 is fixedly connected to the bottom of the bracket 1, and a motor 52 is penetrated through the bottom of the fixing plate 51, and a turntable 512 is fixedly connected to the end of the output shaft of the motor 52, a circular groove 53 is provided on the top of the bracket 1, and a slide groove 54 is provided on the top of the turntable 512, a slide rail 56 is fixedly connected to the top of the bracket 1, and a slider 57 is slidably connected to the top of the slide rail 56, and a moving plate 58 is fixedly connected to the top of the slider 57, and a limiting block 59 is fixedly connected to the side of the moving plate 58, and a slide rod 55 is fixedly connected to the bottom of the moving plate 58 A vacuum block 510 is fixedly connected to the side of the limiting block 59 , and a resistance block 511 is fixedly connected to the inner wall of the vacuum block 510 . The design of the resistance block 511 is conducive to limiting the camera assembly 4 when the resistance block 511 contacts the camera assembly 4 .

[0022] The side section of the vacuum block 510 is set to be concave, the resistance block 511 contacts the circumferential surface of the camera assembly 4, the slide rod 55 is slidably connected to the bottom of the inner wall of the slide groove 54, and the side section of the slide groove 54 is set to be arc-shaped. When the slide rod 55 slides at the bottom of the inner wall of the slide groove 54, it drives the slider 57 to make a linear motion at the top of the slide rail 56.

[0023] In this embodiment, first, when the staff limits the camera assembly 4 set at the other end of the fixed rod 2, the staff starts the motor 52 that runs through the bottom of the fixed plate 51, thereby driving the turntable 512 fixed on the output shaft to slide on the inner wall of the circular groove 53, and at the same time driving the slide groove 54 opened on the top of the turntable 512 to make a circular motion. When the slide groove 54 moves, the slide rod 55 sliding on the bottom of the inner wall slides, so that the moving plate 58 fixed on the top of the slider 57 is subjected to force, and at the same time drives the slider 57 sliding on the top of the slide rail 56 to slide and make a linear motion, thereby driving the limit block 59 fixed on the side of the moving plate 58 to move. When the limit block 59 moves, it drives the vacuum block 510 fixed on the side to approach the circumferential surface of the camera assembly 4. When it moves to a certain position, the inner wall of the vacuum block 510 fixed on the vacuum block 511 and the circumferential surface of the camera assembly 4 are resisted by the limit block 59. As the limit block 59 continues to move, the resistance block 511 clamps the camera assembly 4.

[0024] Example 2 like Figure 1 to Figure 9 As shown, based on the same concept as the above-mentioned embodiment 1, a second embodiment is further proposed, a buffer mechanism 6 is provided at the bottom of the bracket 1, and the buffer mechanism 6 includes a first hollow plate 61, the first hollow plate 61 is fixedly connected to the bottom of the bracket 1, the bottom of the first hollow plate 61 is fixedly connected with a spring 62, the end of the spring 62 away from the first hollow plate 61 is fixedly connected with a buffer frame 63, the top of the inner wall of the first hollow plate 61 is fixedly connected with a recessed block 69, the inner side wall of the recessed block 69 is rotatably connected with a fixed shaft 610, and the circumferential surface of the fixed shaft 610 is fixedly connected with a support rod 68. The above design is beneficial for the spring 62 to buffer the camera assembly 4 when the communication tower shakes up and down.

[0025] The bottom of the buffer frame 63 is fixedly connected to a second hollow plate 64, the inner wall of the second hollow plate 64 is fixedly connected to a return spring 65, the end of the return spring 65 away from the second hollow plate 64 is fixedly connected to a support block 67, and the top of the support block 67 is fixedly connected to a rectangular block 66, so that when the communication tower shakes left and right, the camera assembly 4 is buffered.

[0026] The rectangular block 66 is slidably connected to the bottom of the inner wall of the second hollow plate 64, the support rod 68 is fixedly connected to the side of the buffer frame 63, and the initial state of the spring 62 is set to a relaxed state. The above design is conducive to preventing the camera assembly 4 from being affected by impact force.

[0027] In this embodiment, when the bracket 1 is subsequently shaken up and down, the spring 62 fixed at the bottom of the first hollow plate 61 contracts according to its own elasticity, and at the same time drives the support rod 68 fixed on the circumferential surface of the fixed shaft 610 to be subjected to force, thereby driving the fixed shaft 610 to rotate, and the rotation of the fixed shaft 610 drives the support rod 68 to make an arc movement. After being subjected to impact force for a period of time, the spring 62 expands and contracts according to its own elasticity, thereby offsetting the impact of the impact force on the camera assembly 4. When the buffer frame 63 fixed at the other end of the spring 62 is shaken left and right, the rectangular block 66 on the top of the inner wall of the second hollow plate 64 slides, thereby driving the support block 67 fixed at the bottom to move, and at the same time squeezing the reset spring 65 fixed at the top to offset the impact of the impact force.

[0028] Example 3 like Figure 1 to Figure 9 As shown, based on the same concept as the above-mentioned embodiment 2, a third embodiment is also proposed, a protective mechanism 7 is arranged on the top of the turntable 512, the protective mechanism 7 includes a connecting shaft 71, the circumferential surface of the connecting shaft 71 is fixedly connected to a transmission gear 72, the top of the bracket 1 is fixedly connected to a vertical plate 73, the side of the vertical plate 73 is rotatably connected to a reciprocating screw rod 74, the circumferential surface of the reciprocating screw rod 74 is threadedly connected to a reciprocating wire sleeve 77, the circumferential surface of the reciprocating screw rod 74 is fixedly connected to a connecting gear 75, the side of the vertical plate 73 is fixedly connected to a limiting rod 76, the positive side of the reciprocating wire sleeve 77 is fixedly connected to a push rod 78, the bottom of the protective plate 713 is fixedly connected to a positioning plate 714, the above design is conducive to adjusting the protective plate 713 to a vertical state, thereby protecting the camera assembly 4.

[0029] The side section of the push rod 78 is set to be L-shaped, and the push rod 78 contacts the bottom of the protective plate 713. The transmission gear 72 and the connecting gear 75 are both set to bevel gears. The transmission gear 72 and the connecting gear 75 are meshed with each other. The side section of the reciprocating wire sleeve 77 is set to be rectangular, and the reciprocating wire sleeve 77 is slidably connected to the circumferential surface of the limit rod 76. The above design is conducive to making the reciprocating wire sleeve 77 perform linear reciprocating motion.

[0030] In this embodiment, when the turntable 512 rotates, the connecting shaft 71 fixed on the top is driven to rotate, which drives the transmission gear 72 fixed on the circumferential surface to rotate, and at the same time drives the mutually meshing connecting gears 75 to rotate. The rotation of the connecting gear 75 drives the reciprocating screw rod 74 rotating on the side of the vertical plate 73 to rotate, thereby driving the reciprocating wire sleeve 77 threadedly connected to the circumferential surface to slide on the circumferential surface of the limit rod 76, so that the reciprocating wire sleeve 77 makes a linear motion. When the reciprocating wire sleeve 77 moves, it drives the push rod 78 fixed on the side to move. As the reciprocating wire sleeve 77 moves, it drives the push rod 78 fixed on the side to move. 7 continues to move, thereby driving the push rod 78 to contact the bottom of the protective plate 713. As the push rod 78 continues to move, the torsion spring rod 710 rotating on the inner wall of the hollow block 79 rotates. The rotation of the torsion spring rod 710 drives the sleeve 711 fixed on the circumferential surface to rotate. When the sleeve 711 rotates, it drives the hinge plate 712 fixed on the circumferential surface to make an arc movement, thereby driving the protective plate 713 at the bottom of the hinge plate 712 to make an arc movement. As the torsion spring rod 710 continues to move, the protective plate 713 is in a vertical state to protect the camera assembly 4.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A camera anti-sway support structure for a communication tower, characterized in that: It comprises a bracket (1) and a fixing rod (2), characterized in that: the fixing rod (2) is fixedly connected to the top of the bracket (1), one end of the fixing rod (2) away from the bracket (1) is fixedly connected to a support plate (3), a camera assembly (4) is arranged on the top of the support plate (3), and an anti-sway assembly (5) is arranged on the top of the bracket (1); The anti-sway component (5) comprises a fixed plate (51), the fixed plate (51) is fixedly connected to the bottom of the bracket (1), a motor (52) passes through the bottom of the fixed plate (51), a turntable (512) is fixedly connected to the end of the output shaft of the motor (52), a circular groove (53) is provided at the top of the bracket (1), a slide groove (54) is provided at the top of the turntable (512), a slide rail (56) is fixedly connected to the top of the bracket (1), a slider (57) is slidably connected to the top of the slide rail (56), a moving plate (58) is fixedly connected to the top of the slider (57), a side of the moving plate (58) is fixedly connected to a limiting block (59), and a slide rod (55) is fixedly connected to the bottom of the moving plate (58).

2. The camera anti-sway support structure of a communication tower according to claim 1, characterized in that: A vacuum block (510) is fixedly connected to the side surface of the limiting block (59), and a resistance block (511) is fixedly connected to the inner wall of the vacuum block (510).

3. The camera anti-sway support structure of a communication tower according to claim 2, characterized in that: The side cross-section of the vacuum block (510) is arranged to be concave, the abutment block (511) contacts the circumferential surface of the camera assembly (4), the slide bar (55) is slidably connected to the bottom of the inner wall of the slide groove (54), and the side cross-section of the slide groove (54) is arranged to be arc-shaped.

4. The camera anti-sway support structure of a communication tower according to claim 1, characterized in that: A buffer mechanism (6) is provided at the bottom of the bracket (1), and the buffer mechanism (6) comprises a first hollow plate (61), the first hollow plate (61) is fixedly connected to the bottom of the bracket (1), a spring (62) is fixedly connected to the bottom of the first hollow plate (61), an end of the spring (62) away from the first hollow plate (61) is fixedly connected to a buffer frame (63), a concave block (69) is fixedly connected to the top of the inner wall of the first hollow plate (61), an inner side wall of the concave block (69) is rotatably connected to a fixed shaft (610), and a support rod (68) is fixedly connected to the circumferential surface of the fixed shaft (610).

5. The camera anti-sway support structure of a communication tower according to claim 4, characterized in that: The bottom of the buffer frame (63) is fixedly connected to a second hollow plate (64), the inner side wall of the second hollow plate (64) is fixedly connected to a return spring (65), one end of the return spring (65) away from the second hollow plate (64) is fixedly connected to a support block (67), and the top of the support block (67) is fixedly connected to a rectangular block (66).

6. The camera anti-sway support structure of a communication tower according to claim 5, characterized in that: The rectangular block (66) is slidably connected to the bottom of the inner wall of the second hollow plate (64), the support rod (68) is fixedly connected to the side of the buffer frame (63), and the initial state of the spring (62) is set to a relaxed state.

7. The camera anti-sway support structure of a communication tower according to claim 1, characterized in that: A protective mechanism (7) is provided at the top of the rotating disk (512), and the protective mechanism (7) comprises a connecting shaft (71), the connecting shaft (71) is fixedly connected to the top of the rotating disk (512), a hollow block (79) is fixedly connected to the top of the bracket (1), a torsion spring rod (710) is rotatably connected to the inner wall of the hollow block (79), a sleeve (711) is fixedly connected to the circumferential surface of the torsion spring rod (710), a hinge plate (712) is fixedly connected to the circumferential surface of the sleeve (711), and a protective plate (713) is fixedly connected to the bottom of the hinge plate (712).

8. The camera anti-sway support structure of a communication tower according to claim 7, characterized in that: The circumferential surface of the connecting shaft (71) is fixedly connected to a transmission gear (72); the top of the bracket (1) is fixedly connected to a vertical plate (73); the side of the vertical plate (73) is rotatably connected to a reciprocating screw rod (74); the circumferential surface of the reciprocating screw rod (74) is threadedly connected to a reciprocating thread sleeve (77); the circumferential surface of the reciprocating screw rod (74) is fixedly connected to a connecting gear (75); the side of the vertical plate (73) is fixedly connected to a limiting rod (76); the front side of the reciprocating thread sleeve (77) is fixedly connected to a push rod (78); and the bottom of the protective plate (713) is fixedly connected to a positioning plate (714).

9. The camera anti-sway support structure of a communication tower according to claim 8, characterized in that: The side cross-section of the push rod (78) is configured to be L-shaped, the push rod (78) is in contact with the bottom of the protective plate (713), the transmission gear (72) and the connecting gear (75) are both configured to be bevel gears, the transmission gear (72) and the connecting gear (75) are meshed with each other, the side cross-section of the reciprocating wire sleeve (77) is configured to be rectangular, and the reciprocating wire sleeve (77) is slidably connected to the circumferential surface of the limit rod (76).

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