Marine collision avoidance radar

Abstract

This invention belongs to the field of marine radar technology, specifically a marine collision avoidance radar, comprising a horizontal rod radar body and a base. The horizontal rod radar body is fixedly mounted on the base and includes an antenna suspension foreign object removal assembly. The antenna suspension foreign object removal assembly includes a scraper and a second bracket. Multiple telescopic pins slide through one side of the scraper, and a rack is fixedly connected to one end of the scraper. The lower end of the second bracket is fixedly connected to the base. This invention utilizes the antenna suspension foreign object removal assembly. Every time the horizontal rod antenna on the horizontal rod radar body operates for a period of time, the scraper will slide along the antenna surface, and under the action of the telescopic pins, it will move the foreign object, causing it to fall off the antenna. This avoids foreign objects such as fishing nets, plastic bags, and cloth strips falling onto the antenna surface and becoming suspended there due to wind. Water-containing foreign objects absorb or reflect radar waves, causing a detection blind zone or echo attenuation in that direction, leading to missed alarms.

Description

Technical Field

[0001] This invention belongs to the field of marine radar technology, specifically a marine collision avoidance radar. Background Technology

[0002] Marine collision avoidance radar is a core device in ship navigation systems used to detect surrounding water surface targets, assess collision risks, and issue early warnings. In conditions of extremely low visibility, such as night, heavy fog, and heavy rain, when crew members cannot see the waterway and other vessels with the naked eye, collision avoidance radar can work around the clock, automatically identify risks, and issue alarms.

[0003] In existing technology, marine collision avoidance radar is equipped with a continuously rotating horizontal rod antenna. A drive motor drives the horizontal rod antenna to rotate 360° continuously at a constant speed. Each rotation of the antenna scans the sea surface with its narrow beam. After transmitting a pulse, the antenna immediately switches to receiving mode, waiting for the weak echo reflected back from the target (such as other ships, buoys, or coastlines). After receiving the echo, the antenna transmits the signal to the receiver via a waveguide feeder for processing, ultimately forming a bright spot on the display.

[0004] However, during operation, foreign objects such as fishing nets, plastic bags, and strips of cloth often fall onto the surface of the horizontal mast antenna due to wind and become suspended there. Moisture-laden objects (such as soaked fishing nets or plastic bags) can absorb or reflect radar waves, creating blind spots or attenuating echoes in that direction, leading to missed detections. Furthermore, objects swaying in the wind may be misidentified by the radar as moving targets, generating a large amount of clutter and false echoes on the display screen, interfering with operator judgment and reducing the accuracy of target location measurements. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention proposes a marine collision avoidance radar.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a marine anti-collision radar, including a horizontal rod radar body and a base, wherein the horizontal rod radar body is fixedly installed on the base and includes an antenna suspension foreign object removal component; The antenna-suspended foreign object removal assembly includes a scraper and a second bracket. Multiple telescopic nails slide through one side of the scraper, and a rack is fixedly connected to one end of the scraper. The lower end of the second bracket is fixedly connected to the base, and a lifting plate is slidably connected to one side of the second bracket. The rack is slidably mounted on the lifting plate. The width of the scraper matches the width of the antenna of the horizontal rod radar body. When the antenna of the horizontal rod radar body is parallel to the rack, the scraper can slide along the antenna surface and push the suspended object on the antenna off.

[0007] Preferably, it includes a nail body telescopic drive assembly; The nail telescopic drive assembly includes a connecting rod, which is slidably connected to the inner cavity of the scraper, and one end of multiple telescopic nails is fixedly connected to the connecting rod.

[0008] Preferably, a threaded rod is threaded to one side of the connecting rod, and both ends of the threaded rod are rotatably disposed on the inner wall of the scraper. A motor is fixedly connected to one side of the scraper, and the output end of the motor is fixedly connected to one end of the threaded rod.

[0009] Preferably, a gear is rotatably mounted on one side of the lifting plate, the gear meshing with the toothed blocks on the rack, and a second motor is fixedly connected to one side of the lifting plate, the output end of the second motor being fixedly connected to the gear.

[0010] Preferably, it includes a foreign object collection auxiliary component; The foreign object collection auxiliary component includes a support frame and a collection box. Both the support frame and the collection box are fixedly connected to one side of the upper end face of the base. A winding drum is rotatably installed on one side of the support frame. A cylinder is fixedly connected to one side of the upper end of the support frame. A connecting plate is fixedly connected to the piston end of the cylinder. Two sliding rods are slidably connected to the connecting plate. A pressure roller is fixedly connected to the lower end of the sliding rods. A fixing ring for the scraper to pass through is fixedly connected to one side of the upper end face of the base.

[0011] Preferably, it includes a foreign object clamping structure; The foreign object clamping structure includes a cylinder five fixedly connected to one side of the inner wall of the winding drum. A sliding plate is fixedly connected to the piston end of the cylinder five. Clamping blocks are slidably connected to both sides of the sliding groove of the sliding plate. A strip-shaped through hole is provided on the winding drum for the clamping blocks to pass through.

[0012] Preferably, the slide plate has a bidirectional threaded rod rotatably installed at both ends of the slide groove, and the two sides of the bidirectional threaded rod are respectively threaded to two clamping blocks. A motor is fixedly connected to one end of the slide plate, and the output end of the motor is fixedly connected to one end of the bidirectional threaded rod. A motor is fixedly connected to one side of the bracket, and the output end of the motor is fixedly connected to one end of the winding drum.

[0013] Preferably, a spring is fitted on one side of the slide rod, with one end of the spring fixedly connected to the end of the slide rod and the other end fixedly connected to the connecting plate.

[0014] Preferably, it includes a post-winding lateral compression assembly; The post-winding transverse compression assembly includes a conical ring, the inner diameter of which is adapted to the diameter of the winding drum. A guide rod is fixedly connected to one side of the conical ring, and the guide rod is slidably mounted on a support. A cylinder is fixedly connected to one side of the support, and the piston end of the cylinder is fixedly connected to one side of the conical ring. A cylinder is fixedly connected to one side of the support, and a baffle is fixedly connected to the piston end of the cylinder. The conical ring and the baffle cooperate to compress foreign objects.

[0015] Preferably, a cylinder is fixedly connected to one side of the upper end of the second bracket, and the piston end of the cylinder is fixedly connected to one side of the lifting plate.

[0016] The beneficial effects of this invention are as follows: 1. The marine collision avoidance radar of this invention utilizes an antenna-suspended foreign object removal component. Every certain period of operation, a scraper moves along the antenna surface of the horizontal antenna on the radar body, and under the action of a telescopic pin, the foreign object is moved and detached from the antenna. This prevents foreign objects such as fishing nets, plastic bags, and strips of cloth from falling onto the antenna surface and becoming suspended there due to wind. Water-containing foreign objects absorb or reflect radar waves, causing blind spots or echo attenuation in that direction, leading to missed detections. Furthermore, it avoids the possibility of wind-blown foreign objects being misidentified as moving targets by the radar, generating a large amount of clutter and false echoes on the display screen, thus interfering with operator judgment and reducing the accuracy of target location measurement.

[0017] 2. The marine collision avoidance radar of this invention, through the cooperation of a foreign object collection auxiliary component, a foreign object clamping structure, and a winding and laterally compressing component, can collect and compress foreign objects scraped off the antenna and place them in a collection box. This significantly reduces the volume of the foreign object, making it less likely for it to be re-suspended on the antenna by wind, thus preventing further impact on the antenna's detection performance. Furthermore, the collected and compressed foreign object facilitates subsequent cleanup by personnel, and also prevents foreign objects detached from the antenna from being suspended on other equipment on board by wind, thereby ensuring the normal operation of other equipment. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the horizontal bar radar body; Figure 3 This is a schematic diagram of a three-dimensional structure of the support frame; Figure 4 This is a schematic diagram of the three-dimensional structure of the support from another perspective; Figure 5 This is a schematic diagram of the three-dimensional structure of the support frame at two locations; Figure 6 This is a schematic diagram of the three-dimensional structure of the scraper; Figure 7 This is a schematic diagram of the three-dimensional structure at the fixing ring; Figure 8 This is a schematic diagram of the three-dimensional structure of the winding drum; Figure 9 This is a three-dimensional structural diagram of the telescopic nail. Figure 10 This is a schematic diagram of the three-dimensional structure of the pressure roller. Figure 11 This is a three-dimensional structural diagram of the winding drum from another perspective.

[0020] In the diagram: 1. Base; 2. Horizontal radar body; 3. Bracket 1; 4. Rack; 5. Cylinder 1; 6. Collection box; 7. Bracket 2; 8. Cylinder 2; 9. Cylinder 3; 10. Cylinder 4; 11. Motor 1; 12. Lifting plate; 13. Motor 2; 14. Gear; 15. Slide rod; 16. Spring; 17. Connecting plate; 18. Pressure roller; 19. Winding drum; 20. Guide rod; 21. Conical ring; 22. Baffle plate; 23. Clamping block; 24. Motor 3; 25. Slide plate; 26. Cylinder 5; 27. Scraper; 28. Telescopic nail; 29. ​​Bidirectional threaded rod; 30. Fixing ring; 31. Threaded rod; 32. Connecting rod; 33. Motor 4. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described 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.

[0022] Example 1: Please refer to Figures 1-11 The present invention provides a technical solution: a marine anti-collision radar, including a horizontal rod radar body 2 and a base 1, wherein the horizontal rod radar body 2 is fixedly installed on the base 1, and includes an antenna suspension foreign object removal component; The antenna suspension foreign object removal assembly includes a scraper 27 and a bracket 27. Multiple telescopic nails 28 are slidably inserted through one side of the scraper 27. A rack 4 is fixedly connected to one end of the scraper 27. The lower end of the bracket 27 is fixedly connected to the base 1. A lifting plate 12 is slidably connected to one side of the bracket 27. The rack 4 is slidably set on the lifting plate 12. The width of the scraper 27 matches the width of the antenna of the horizontal bar radar body 2. When the antenna of the horizontal bar radar body 2 is parallel to the rack 4, the scraper 27 can slide along the antenna surface and push the suspended object on the antenna off.

[0023] like Figure 6 As shown, it includes a nail body telescopic drive assembly; The nail telescopic drive assembly includes a connecting rod 32, which is slidably connected to the inner cavity of the scraper 27, and one end of multiple telescopic nails 28 is fixedly connected to the connecting rod 32.

[0024] like Figure 6 As shown, a threaded rod 31 is threadedly connected to one side of the connecting rod 32. Both ends of the threaded rod 31 are rotatably mounted on the inner wall of the scraper 27. A motor 4 33 is fixedly connected to one side of the scraper 27. The output end of the motor 4 33 is fixedly connected to one end of the threaded rod 31.

[0025] like Figure 5 As shown, a gear 14 is rotatably mounted on one side of the lifting plate 12. The gear 14 meshes with the toothed blocks on the rack 4. A motor 13 is fixedly connected to one side of the lifting plate 12. The output end of the motor 13 is fixedly connected to the gear 14.

[0026] Specifically, in existing technologies, marine collision avoidance radars typically feature a continuously rotating horizontal antenna. A drive motor propels this antenna to rotate 360° continuously at a constant speed. Each rotation of the antenna transmits a narrow beam across the sea surface. After transmitting a pulse, the antenna immediately switches to receiving mode, waiting for the faint echo reflected from targets such as other vessels, buoys, or the coastline. Upon receiving the echo, the antenna transmits the signal via a waveguide feeder to a receiver for processing, ultimately displaying a bright spot on the screen.

[0027] However, during operation, foreign objects such as fishing nets, plastic bags, and strips of cloth often fall onto the surface of the horizontal mast antenna due to wind and become suspended there. Moisture-laden objects, such as soaked fishing nets and plastic bags, can absorb or reflect radar waves, creating blind spots or attenuating echoes in that direction, leading to missed detections. Furthermore, objects swaying in the wind may be misidentified by the radar as moving targets, generating a large amount of clutter and false echoes on the display screen, interfering with operator judgment and reducing the accuracy of target location measurements.

[0028] Therefore, in order to solve the above problems, the working principle of this embodiment is as follows: Install base 1 in a suitable position on the ship. The horizontal antenna on the horizontal radar body 2 rotates continuously under the action of the drive motor.

[0029] The antenna suspension foreign object removal assembly operates periodically. When the assembly starts, the antenna stops at a specific angle, parallel to the rack 4, with the scraper 27 aligned with it. Then, motor 213 drives gear 14 to rotate, causing the rack 4 to slide laterally on the lifting plate 12. The scraper 27 then approaches and slides along the antenna surface, moving from one end to the other. During this movement, the scraper 27 contacts any foreign objects suspended on the antenna, and the telescopic pins 28 hook them, causing the scraper 27 to move the object. Once the scraper 27 detaches from the antenna, the foreign object falls off. At this point, motor 43 drives the threaded rod 31 to rotate, causing the connecting rod 32 to slide within the scraper 27. This retracts the telescopic pins 28 into the scraper 27, causing the hooked object to fall off due to loss of support. The scraper 27 then resets, and the antenna continues to rotate.

[0030] Repeating the above operation, at regular intervals, the scraper 27 will slide along the antenna surface, and under the action of the telescopic pin 28, it will move the foreign object, causing it to fall off the antenna. This prevents foreign objects such as fishing nets, plastic bags, and strips of cloth from falling onto the antenna surface and hanging there due to wind. Water-containing foreign objects absorb or reflect radar waves, causing blind spots or echo attenuation in that direction, leading to missed alarms. In addition, it also avoids the possibility that foreign objects swaying in the wind may be misjudged by the radar as moving targets, generating a large amount of clutter and false echoes on the display screen, thereby interfering with the operator's judgment and reducing the accuracy of target azimuth measurement. Example

[0031] like Figure 4 and Figure 7 As shown, it includes a component for collecting detached foreign objects; The foreign object collection auxiliary component includes a bracket 3 and a collection box 6. Both the bracket 3 and the collection box 6 are fixedly connected to one side of the upper end face of the base 1. A winding drum 19 is rotatably installed on one side of the bracket 3. A cylinder 5 is fixedly connected to one side of the upper end of the bracket 3. A connecting plate 17 is fixedly connected to the piston end of the cylinder 5. Two sliding rods 15 are slidably connected to the connecting plate 17. A pressure roller 18 is fixedly connected to the lower end of the sliding rods 15. A fixing ring 30 for the scraper 27 to pass through is fixedly connected to one side of the upper end face of the base 1.

[0032] like Figure 11 As shown, it includes a foreign object clamping structure; The foreign object clamping structure includes a cylinder 26 fixedly connected to one side of the inner wall of the take-up drum 19. A sliding plate 25 is fixedly connected to the piston end of the cylinder 26. Clamping blocks 23 are slidably connected to both sides of the sliding groove of the sliding plate 25. A strip-shaped through hole is provided on the take-up drum 19 for the clamping blocks 23 to pass through.

[0033] like Figure 8As shown, the slide plate 25 has a double-threaded rod 29 rotatably installed at both ends of the slide groove. The two sides of the double-threaded rod 29 are threadedly connected to two clamping blocks 23 respectively. A motor 3 24 is fixedly connected to one end of the slide plate 25. The output end of the motor 3 24 is fixedly connected to one end of the double-threaded rod 29. A motor 11 is fixedly connected to one side of the bracket 1 3. The output end of the motor 11 is fixedly connected to one end of the winding drum 19.

[0034] like Figure 10 As shown, a spring 16 is sleeved on one side of the slide rod 15. One end of the spring 16 is fixedly connected to the end of the slide rod 15, and the other end is fixedly connected to the connecting plate 17.

[0035] like Figure 10 As shown, it includes a post-winding lateral compression assembly; The transverse compression assembly after winding includes a conical ring 21, the inner diameter of which is adapted to the diameter of the winding drum 19. A guide rod 20 is fixedly connected to one side of the conical ring 21, and the guide rod 20 is slidably mounted on the bracket 3. A cylinder 4 10 is fixedly connected to one side of the bracket 3, and the piston end of the cylinder 4 10 is fixedly connected to one side of the conical ring 21. A cylinder 3 9 is fixedly connected to one side of the bracket 3, and a baffle 22 is fixedly connected to the piston end of the cylinder 3 9. The conical ring 21 and the baffle 22 cooperate to compress foreign objects.

[0036] like Figure 5 As shown, a cylinder 8 is fixedly connected to one side of the upper end of the bracket 2 7, and the piston end of the cylinder 2 8 is fixedly connected to one side of the lifting plate 12.

[0037] Specifically, in the above embodiments, although the foreign object can be scraped off the antenna with the cooperation of the scraper 27 and the telescopic nail 28, the scraped-off foreign object is still around the horizontal rod radar body 2, and is easily resuspended on the antenna by the wind. The horizontal rod antenna will be affected until the next operation of the antenna suspension foreign object removal component.

[0038] Therefore, in order to solve the above problems, the working principle of this embodiment is as follows: Whenever the scraper 27 needs to move along the antenna surface, cylinder 28 first drives the lifting plate 12 to rise a certain distance, making the scraper 27 higher than the antenna. Then, it drives the scraper 27 to move to the end of the antenna away from the fixed ring 30, and then drives the scraper 27 to descend, scraping away foreign objects from the antenna surface. The foreign objects will gradually approach the fixed ring 30. Since the scraper 27 passes through the fixed ring 30, the foreign objects hooked by the telescopic pin 28 will also pass through the fixed ring 30, and will be retracted when passing through the fixed ring 30. Until the scraper 27 passes between the pressure roller 18 and the take-up drum 19, at this time, the telescopic pin 28 retracts, the end of the foreign object falls off the scraper 27, and the main body of the foreign object will rest on the take-up drum 19. Then, motor 324 drives the bidirectional threaded rod 29 to rotate, causing the two clamping blocks 23 to come closer together and clamp the end of the foreign object. Then, cylinder 5 drives the pressure roller 18 to descend, causing it to abut against the take-up drum 19 under the action of spring 16 and slide rod 15, thus pressing down the foreign object. At this time, motor 11 drives the take-up drum 19 to rotate, and the foreign object is wound up under the coordinated action of the take-up drum 19 and pressure roller 18 until the foreign object is completely wound up on the take-up drum 19. At this time, clamp 23 releases the end of the foreign object and retracts into the inner cavity of the take-up drum 19 under the action of cylinder 26. At this time, cylinder 4 drives the conical ring 21 to move laterally, and the edge of the conical ring 21 will press against the contact point between the take-up drum 19 and pressure roller 18, and be sleeved on the take-up drum 19. At this time, the foreign object on the take-up drum 19 will be pushed by the conical ring 21 and approach the baffle 22, and the foreign object after winding can be compressed under the cooperation of the baffle 22 and the conical ring 21. Then, cylinder 39 drives the baffle 22 to move laterally, so that the baffle 22 is no longer in contact with the end of the winding drum 19. Then, the conical ring 21 continues to move laterally, which pushes off the compressed foreign object and makes it fall into the collection box 6. At this time, the foreign object in the collection box 6 has been wound and compressed, and its volume is significantly reduced, so the foreign object is unlikely to be hung on the antenna again by the wind, thus avoiding the antenna's working effect being affected again. In addition, the wound and compressed foreign object is also easier for personnel to handle later, and it also avoids the situation where foreign objects that have fallen off the antenna are hung on other equipment on the ship by the wind, ensuring the normal operation of other equipment.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine collision avoidance radar, comprising a horizontal rod radar body (2) and a base (1), wherein the horizontal rod radar body (2) is fixedly mounted on the base (1), characterized in that: Includes antenna suspension foreign object removal components; The antenna suspension foreign object removal assembly includes a scraper (27) and a bracket (7). Multiple telescopic nails (28) are slidably inserted through one side of the scraper (27). A rack (4) is fixedly connected to one end of the scraper (27). The lower end of the bracket (7) is fixedly connected to the base (1). A lifting plate (12) is slidably connected to one side of the bracket (7). The rack (4) is slidably set on the lifting plate (12). The width of the scraper (27) matches the antenna width of the horizontal bar radar body (2). When the antenna of the horizontal bar radar body (2) is parallel to the rack (4), the scraper (27) can slide along the antenna surface and push the suspended object on the antenna off.

2. The marine collision avoidance radar according to claim 1, characterized in that: Includes the nail body telescopic drive assembly; The nail telescopic drive assembly includes a connecting rod (32), which is slidably connected to the inner cavity of the scraper (27), and one end of multiple telescopic nails (28) is fixedly connected to the connecting rod (32).

3. A marine collision avoidance radar according to claim 2, characterized in that: The connecting rod (32) is threaded to a threaded rod (31) on one side. Both ends of the threaded rod (31) are rotatably mounted on the inner wall of the scraper (27). A motor (33) is fixedly connected to one side of the scraper (27). The output end of the motor (33) is fixedly connected to one end of the threaded rod (31).

4. A marine collision avoidance radar according to claim 1, characterized in that: A gear (14) is rotatably mounted on one side of the lifting plate (12). The gear (14) meshes with the toothed blocks on the rack (4). A motor (13) is fixedly connected to one side of the lifting plate (12). The output end of the motor (13) is fixedly connected to the gear (14).

5. A marine collision avoidance radar according to claim 1, characterized in that: Includes auxiliary components for collecting detached foreign objects; The foreign object collection auxiliary component includes a bracket (3) and a collection box (6). The bracket (3) and the collection box (6) are both fixedly connected to one side of the upper end face of the base (1). A winding drum (19) is rotatably arranged on one side of the bracket (3). A cylinder (5) is fixedly connected to one side of the upper end of the bracket (3). A connecting plate (17) is fixedly connected to the piston end of the cylinder (5). Two sliding rods (15) are slidably connected on the connecting plate (17). A pressure roller (18) is fixedly connected to the lower end of the sliding rods (15). A fixing ring (30) for the scraper (27) to pass through is fixedly connected to one side of the upper end face of the base (1).

6. A marine collision avoidance radar according to claim 5, characterized in that: Including foreign object clamping structures; The foreign object clamping structure includes a cylinder five (26) fixedly connected to one side of the inner wall of the take-up drum (19). The piston end of the cylinder five (26) is fixedly connected to a sliding plate (25). Clamping blocks (23) are slidably connected to both sides of the sliding groove of the sliding plate (25). The take-up drum (19) is provided with a strip-shaped through hole for the clamping blocks (23) to pass through.

7. A marine collision avoidance radar according to claim 6, characterized in that: The slide plate (25) has a double-threaded rod (29) rotatably installed at both ends of the slide groove. The two sides of the double-threaded rod (29) are threadedly connected to two clamping blocks (23) respectively. One end of the slide plate (25) is fixedly connected to a motor three (24). The output end of the motor three (24) is fixedly connected to one end of the double-threaded rod (29). One side of the bracket one (3) is fixedly connected to a motor one (11). The output end of the motor one (11) is fixedly connected to one end of the winding drum (19).

8. A marine collision avoidance radar according to claim 5, characterized in that: A spring (16) is fitted on one side of the slide rod (15). One end of the spring (16) is fixedly connected to the end of the slide rod (15), and the other end is fixedly connected to the connecting plate (17).

9. A marine collision avoidance radar according to claim 5, characterized in that: Including the post-winding lateral compression assembly; The winding transverse compression assembly includes a conical ring (21), the inner diameter of which is adapted to the diameter of the winding drum (19). A guide rod (20) is fixedly connected to one side of the conical ring (21), and the guide rod (20) is slidably mounted on a support (3). A cylinder (10) is fixedly connected to one side of the support (3), and the piston end of the cylinder (10) is fixedly connected to one side of the conical ring (21). A cylinder (9) is fixedly connected to one side of the support (3), and a baffle (22) is fixedly connected to the piston end of the cylinder (9). The conical ring (21) and the baffle (22) cooperate to squeeze the foreign object.

10. A marine collision avoidance radar according to claim 1, characterized in that: A cylinder 2 (8) is fixedly connected to one side of the upper end of the bracket 2 (7), and the piston end of the cylinder 2 (8) is fixedly connected to one side of the lifting plate (12).

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