Multi-stage hydraulic lifting device for radar antenna

Abstract

The invention relates to the technical field of hydraulic lifting, and particularly discloses a multi-stage hydraulic lifting device for a radar antenna, which comprises a first-stage lifting section and a hydraulic cylinder, a second-stage lifting section is slidably connected to the inner wall of the top of the first-stage lifting section, and a third-stage lifting section is slidably connected to the inner wall of the top of the second-stage lifting section; a fourth-stage lifting section is slidably connected to the inner wall of the top of the third-stage lifting section, a fifth-stage lifting section is slidably connected to the inner wall of the top of the fourth-stage lifting section, a first fixing rod is fixedly connected to the two sides of the inner wall of the bottom end of the first-stage lifting section, and two second fixing rods are fixedly connected to the two sides of the inner wall of the bottom end of the second-stage lifting section; a mounting block is fixedly connected to the middles of the two second fixing rods, and a hydraulic cylinder is fixedly mounted at the top of the mounting block. Lifting depends on driving equipment, the load form of the antenna can be changed by utilizing the lifting function of multi-stage lifting, then a flexible structure is converted into a rigid structure by utilizing a mutual locking mode, and positive significance is achieved on operation stability.

Description

Technical Field

[0001] This invention relates to the field of hydraulic lifting technology, and more particularly to a multi-stage hydraulic lifting device for radar antennas. Background Technology

[0002] When installing equipment such as radar antennas at high altitudes, lifting equipment is required for raising them.

[0003] Traditional lifting towers rely on gravity to retract individual tower sections. In actual use, this can lead to inconsistent descent speeds among the individual tower sections, potentially causing collisions between them. This negatively impacts the overall stability and safety of the lifting device. Furthermore, as the height of the lifting tower increases, the tower swaying increases during ascent, posing a potential hazard to the safe lifting of the radar antenna and the safe operation of the lifting tower itself. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage hydraulic lifting device for radar antennas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-stage hydraulic lifting device for radar antennas includes a primary lifting section and a hydraulic cylinder. The primary lifting section has a rectangular hollow structure. A secondary lifting section is slidably connected to the top inner wall of the primary lifting section. A tertiary lifting section is slidably connected to the top inner wall of the secondary lifting section. A quaternary lifting section is slidably connected to the top inner wall of the tertiary lifting section. A quinary lifting section is slidably connected to the top inner wall of the quaternary lifting section. A first fixing rod is fixedly connected to both sides of the bottom inner wall of the primary lifting section. Two second fixing rods are fixedly connected to both sides of the bottom inner wall of the secondary lifting section. A cylinder is fixedly connected to the middle of the two second fixing rods. A mounting block has a hydraulic cylinder fixedly mounted on its top. The end of the hydraulic cylinder's hydraulic rod is fixedly connected to the center of a first fixed rod. A first pulley is rotatably connected to the top of the hydraulic cylinder. A connecting block is fixedly connected to the inner wall of the bottom of the three-stage lifting section. A first lifting rope is slidably connected to the top of the first pulley. One end of the first lifting rope is fixedly connected to the top of the connecting block, and the other end is fixedly connected to one side of the first fixed rod. A sliding ring sleeved on the outer wall of the hydraulic cylinder is fixedly connected to the side of the connecting block near the hydraulic cylinder. A fixed block is fixedly connected to the side of the sliding ring away from the connecting block. A safety mechanism is provided inside the fixed block.

[0007] Preferably, a second pulley is rotatably connected to the middle of one side of the top of the third-stage lifting section, and a second lifting rope is slidably connected to the top of the second pulley. One end of the second lifting rope is fixedly connected to the inner wall of the bottom of the second-stage lifting section, and the other end of the second lifting rope is fixedly connected to the outer wall of the bottom of the fourth-stage lifting section. A third pulley is rotatably connected to the middle of the top of the fourth-stage lifting section away from the second pulley, and a third lifting rope is slidably connected to the top of the third pulley. One end of the third lifting rope is fixedly connected to the inner wall of the bottom of the third-stage lifting section, and the other end of the third lifting rope is fixedly connected to the outer wall of the bottom of the fifth-stage lifting section.

[0008] Preferably, the bottom of the fourth-stage lifting section has two fourth pulleys rotatably connected to both sides, with the two fourth pulleys located on both sides of the third lifting rope. First descending ropes are slidably connected to the bottom of the two fourth pulleys. One end of each first descending rope is fixedly connected to the inner wall of the top of the third-stage lifting section, and the other end is fixedly connected to the outer wall of the top of the fifth-stage lifting section. The bottom of the third-stage lifting section has two fifth pulleys rotatably connected to both sides, with the two fifth pulleys located on both sides of the second lifting rope. Second descending ropes are slidably connected to the bottom of the two fifth pulleys. One end of each second descending rope is fixedly connected to the inner wall of the top of the second-stage lifting section, and the other end is fixedly connected to the outer wall of the top of the fourth-stage lifting section. The bottom of the second-stage lifting section has two sixth pulleys rotatably connected to both sides, with the two sixth pulleys located on both sides of the third lifting rope. Third descending ropes are slidably connected to the bottom of the two sixth pulleys. One end of each third descending rope is fixedly connected to the inner wall of the top of the first-stage lifting section, and the other end is fixedly connected to the outer wall of the top of the third-stage lifting section.

[0009] Preferably, the sliding ring has a hollow internal structure, and symmetrical rotating rings are rotatably connected to the top and bottom of the sliding ring. One end of a coil spring is fixedly connected to the inner side wall of the rotating ring, and the other end of the coil spring is fixedly connected to the inner side wall of the sliding ring.

[0010] Preferably, the rotating ring has four annular storage slots, the diameter of which decreases sequentially. Each of the four storage slots contains a steel wire rope. The ends of the four upper steel wire ropes pass through the top perimeter of the rotating ring and the sliding ring, respectively, and are fixedly connected to the bottom inner wall perimeter of the fourth-stage lifting section. The ends of the four lower steel wire ropes pass through the bottom perimeter of the rotating ring and the sliding ring, respectively, and are fixedly connected to the bottom inner wall perimeter of the second-stage lifting section.

[0011] Preferably, the fixing block has a through groove in the middle, shaft sliding grooves are formed on the inner walls on both sides of the through groove, and the fixing block below the two shaft sliding grooves has an elongated movable groove.

[0012] Preferably, the safety mechanism includes a rotating block and a pressing plate. Two annular blocks are slidably connected in the two shaft grooves. A rotating block is fixedly connected between the two annular blocks. A through hole is opened in the center of the rotating block. A first lifting rope passes through the through hole. The top and bottom of the inner ring of the annular block are symmetrically provided with mating grooves. An annular cylinder is slidably connected to the center of the annular block through two mating strips that are slidably connected to the mating grooves. Both annular cylinders are inserted into the through hole. A pressing plate is fixedly connected to the opposite face of the two annular cylinders.

[0013] Preferably, the outer ring of the side wall of the annular block is rotatably connected to a rotating shaft through an annular groove. The two rotating shafts are slidably connected to two shaft sliding grooves respectively. A plug rod is fixedly connected to the center of the annular cylinder on the side of the rotating shaft close to the center of the annular cylinder. A second threaded groove is opened on the outer wall of the plug rod. A locking block is fixedly connected to the center of the second threaded groove. A first threaded groove is opened on the outer wall of the annular cylinder. The first threaded groove and the second threaded groove have opposite spiral directions. The end of the locking block is slidably connected to the first threaded groove.

[0014] Preferably, a connecting rod is fixedly connected to the bottom of the rotating shaft, the bottom of the connecting rod passes through the movable groove, and the bottom end of the connecting rod is rotatably connected to the telescopic end of the electric cylinder. The fixed end of the electric cylinder is rotatably connected to the bottom end of the fixed block through a bracket.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention utilizes a hydraulic cylinder. Since the first pulley is a single movable pulley, its lifting stroke is 2:1 with the hydraulic rod's stroke. Similarly, the lifting stroke of the entire multi-stage hydraulic lifting device is also 2:1 with the hydraulic rod's stroke. Compared to traditional lifting tower devices, it has a larger compression ratio and can achieve a higher stroke using smaller hydraulic cylinders and multi-stage lifting sections. Traditional lifting towers rely on gravity to retract a single tower section. Considering safety, lifting employs a first, second, and third lifting rope, and a first, second, and third descent rope. This ensures that lifting relies entirely on the drive equipment, effectively reducing the risk of loosening and detachment due to accidents such as single tower sections getting stuck. The multi-stage lifting function allows for changes in antenna load configuration, enabling large radar arrays to be made into flexible connection devices. Furthermore, by using interlocking mechanisms, the flexible structure can be transformed into a rigid structure. This allows large, traditionally large frame arrays to be made into small, flexible units, significantly improving operational stability.

[0017] This invention uses steel wire ropes, with two sets of steel wire ropes connecting the sliding ring to the bottom of the fourth-stage lifting section and the second-stage lifting section, respectively. This allows the multi-section lifting device to be connected via a third-stage lifting section after being raised, thereby improving the connection stability between the second-stage, third-stage, and fourth-stage lifting sections and thus enhancing the overall stability of the device. This also promotes the stable lifting and installation of radar antennas.

[0018] This invention incorporates a safety mechanism. This mechanism uses displacement sensors installed in each lifting section of a multi-stage hydraulic lifting device to monitor the movement speed of each section in real time. In the event of an accident causing a lifting section to slip rapidly, an electric cylinder drives two connecting rods to rotate, thereby rotating the shaft, insert rod, and locking block. Since the locking block is slidably connected to the first threaded groove, the rotating block pushes the two annular cylinders and two extrusion plates closer together. Eventually, the two extrusion plates press tightly against the outer wall of the first lifting rope, exerting pressure on it and preventing further contact. This restricts the shaft and insert rod from rotating. The electric cylinder then extends, causing the connecting rods, shaft, extrusion plates, and locking block to rotate as a whole. This causes the locking block to rotate through the through-hole, locking the first lifting rope and creating a locking effect between the first lifting rope and the three-stage lifting section, preventing the entire device from continuing to descend rapidly and spreading danger. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention.

[0020] Figure 2 This is a schematic diagram of the hydraulic cylinder structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention.

[0021] Figure 3 This is a schematic diagram of the connecting block structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0022] Figure 4 This is a schematic diagram of the sliding ring structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0023] Figure 5 This is a schematic diagram of the rotating ring structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0024] Figure 6 This is a schematic diagram of the wire rope and coil spring structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention.

[0025] Figure 7 This is a schematic diagram of the safety mechanism structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0026] Figure 8 This is a schematic diagram of the fixing block structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0027] Figure 9 This is a schematic diagram of the rotating shaft structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0028] Figure 10 This is an exploded view of the annular block and annular cylinder structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention;

[0029] Figure 11 This is a schematic diagram of the insert structure of a multi-stage hydraulic lifting device for radar antennas proposed in this invention.

[0030] In the diagram: 1. First-stage lifting section; 2. Second-stage lifting section; 3. Third-stage lifting section; 4. Fourth-stage lifting section; 5. Fifth-stage lifting section; 6. First fixing rod; 7. Second fixing rod; 8. Mounting block; 9. Hydraulic cylinder; 10. Hydraulic rod; 11. First pulley; 12. First lifting rope; 13. Second lifting rope; 14. Third lifting rope; 15. First descent rope; 16. Second descent rope; 17. Third descent rope; 18. Sliding... 19. Ring; 20. Connecting block; 21. Fixing block; 22. Rotating ring; 23. Coil spring; 24. Steel wire rope; 25. Through groove; 26. Movable groove; 27. Safety mechanism; 28. Rotating block; 29. ​​Through hole; 30. Annular block; 31. Mating groove; 32. Annular cylinder; 33. Extrusion plate; 34. First threaded groove; 35. Rotating shaft; 36. Insert rod; 37. Second threaded groove; 38. Clamping block; 39. Connecting rod; 30. Electric cylinder. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figures 1-11A multi-stage hydraulic lifting device for radar antennas includes a first-stage lifting section 1 and a hydraulic cylinder 9. The first-stage lifting section 1 has a rectangular hollow structure. A second-stage lifting section 2 is slidably connected to the top inner wall of the first-stage lifting section 1. A third-stage lifting section 3 is slidably connected to the top inner wall of the second-stage lifting section 2. A fourth-stage lifting section 4 is slidably connected to the top inner wall of the third-stage lifting section 3. A fifth-stage lifting section 5 is slidably connected to the top inner wall of the fourth-stage lifting section 4. A first fixing rod 6 is fixedly connected to both sides of the bottom inner wall of the first-stage lifting section 1. Two second fixing rods 7 are fixedly connected to both sides of the bottom inner wall of the second-stage lifting section 2. A mounting block 8 is fixedly connected to the middle of the two second fixing rods 7. The top of the mounting block 8 is fixedly... A hydraulic cylinder 9 is fixedly installed. The end of the hydraulic rod 10 of the hydraulic cylinder 9 is fixedly connected to the center of the first fixed rod 6. The top of the hydraulic cylinder 9 is rotatably connected to the first pulley 11. The bottom inner wall of the three-stage lifting section 3 is fixedly connected to the connecting block 19. The top of the first pulley 11 is slidably connected to the first lifting rope 12. One end of the first lifting rope 12 is fixedly connected to the top of the connecting block 19, and the other end of the first lifting rope 12 is fixedly connected to one side of the first fixed rod 6. The side of the connecting block 19 close to the hydraulic cylinder 9 is fixedly connected to the sliding ring 18 sleeved on the outer wall of the hydraulic cylinder 9. The side of the sliding ring 18 away from the connecting block 19 is fixedly connected to the fixing block 20. The fixing block 20 is provided with a safety mechanism 26. Since the first pulley 11 is a single movable pulley, its lifting stroke is 2:1 with the stroke of the hydraulic rod 10. Similarly, the lifting stroke of the entire multi-stage hydraulic lifting device is also 2:1 with the stroke of the hydraulic rod 10. Compared with traditional lifting tower devices, it has a larger compression ratio and can achieve a higher stroke using smaller hydraulic cylinders 9 and multi-stage lifting sections. In the past, lifting towers relied on gravity to retract a single tower section. Considering safety, the lifting uses a first lifting rope 12, a second lifting rope 13, a third lifting rope 14, a first descending rope 15, a second descending rope 16, and a third descending rope 17. This ensures that lifting relies on the drive equipment, effectively reducing the occurrence of problems such as loosening and falling off due to accidents like single tower sections getting stuck. By utilizing the lifting function of multi-stage lifting, the load form of the antenna can be changed. Large radar arrays can be made into flexible connection devices, and by using mutual locking, the flexible structure can be transformed into a rigid structure. Previously large skeleton arrays can be made into small flexible units, which has a positive significance for operational stability.

[0033] As a technical optimization of the present invention, a second pulley is rotatably connected to the middle of one side of the top of the third-stage lifting section 3. A second lifting rope 13 is slidably connected to the top of the second pulley. One end of the second lifting rope 13 is fixedly connected to the inner wall of the bottom of the second-stage lifting section 2, and the other end of the second lifting rope 13 is fixedly connected to the outer wall of the bottom of the fourth-stage lifting section 4. A third pulley is rotatably connected to the middle of the top of the fourth-stage lifting section 4 away from the second pulley. A third lifting rope 14 is slidably connected to the top of the third pulley. One end of the third lifting rope 14 is fixedly connected to the inner wall of the bottom of the third-stage lifting section 3, and the other end of the third lifting rope 14 is fixedly connected to the outer wall of the bottom of the fifth-stage lifting section 5. The third-stage lifting section 3, as the intermediate section of the stacking hydraulic lifting device, plays an important role in the overall stability during operation.

[0034] As a technical optimization of the present invention, two fourth pulleys are rotatably connected to both sides of the bottom end of the fourth lifting section 4. The two fourth pulleys are respectively located on both sides of the third lifting rope 14. The bottom of the two fourth pulleys is slidably connected to the first descending rope 15. One end of the two first descending ropes 15 is fixedly connected to the inner wall of the top of the third lifting section 3, and the other end of the two first descending ropes 15 is fixedly connected to the outer wall of the top of the fifth lifting section 5. Two fifth pulleys are rotatably connected to both sides of the bottom end of the third lifting section 3. The two fifth pulleys are respectively located on both sides of the second lifting rope 13. The bottom of the two fifth pulleys is slidably connected to the first descending rope 15. The second descent rope 16 is movably connected. One end of the two second descent ropes 16 is fixedly connected to the top inner wall of the second-stage lifting section 2, and the other end of the two second descent ropes 16 is fixedly connected to the top outer wall of the fourth-stage lifting section 4. Two sixth pulleys are rotatably connected to both sides of the bottom end of the second-stage lifting section 2. The two sixth pulleys are located on both sides of the third lifting rope 14. The bottom of the two sixth pulleys is slidably connected to the third descent rope 17. One end of the two third descent ropes 17 is fixedly connected to the top inner wall of the first-stage lifting section 1, and the other end of the two third descent ropes 17 is fixedly connected to the top outer wall of the third-stage lifting section 3. The multi-stage hydraulic lifting device is retrieved by retracting the hydraulic rod 10. The hydraulic cylinder 9 and mounting block 8 then pull the second-stage lifting section 2 and the sixth pulley down. The sixth pulley drives the end of the third descent rope 17 to pull the third-stage lifting section 3 and the fifth pulley down. The descent of the fifth pulley drives the end of the second descent rope 16 to pull the fourth-stage lifting section 4 and the fourth pulley down. The descent of the fourth pulley drives the end of the first descent rope 15 to pull the fifth-stage lifting section 5 down. Finally, the multi-stage hydraulic lifting device can be completely retrieved synchronously. Because the first lifting rope 12 loses power from the first pulley 11 when the multi-stage lifting device descends, the first lifting rope 12, the second lifting rope 13, and the third lifting rope 14 are passively moved by the descent of the second-stage lifting section 2, the third-stage lifting section 3, the fourth-stage lifting section 4, and the fifth-stage lifting section 5.

[0035] As a technical optimization of the present invention, the sliding ring 18 has a hollow internal structure. A symmetrically structured rotating ring 21 is rotatably connected to both the top and bottom of the sliding ring 18. One end of a coil spring 22 is fixedly connected to the inner sidewall of the rotating ring 21, and the other end of the coil spring 22 is fixedly connected to the inner sidewall of the sliding ring 18. The coil spring 22, through compression and energy storage, can drive the rotating ring 21 to rotate and recover the wire rope 23 when recovering the multi-section hydraulic lifting device.

[0036] As a technical optimization of the present invention, four annular storage slots are provided inside the rotating ring 21, with the diameters of the four storage slots decreasing sequentially. Steel wire ropes 23 are wound into each of the four storage slots. The ends of the four upper steel wire ropes 23 pass through the top periphery of the rotating ring 21 and the sliding ring 18, respectively, and are fixedly connected to the bottom inner wall periphery of the fourth-stage lifting section 4. The ends of the four lower steel wire ropes 23 pass through the bottom periphery of the rotating ring 21 and the sliding ring 18, respectively, and are fixedly connected to the bottom inner wall periphery of the second-stage lifting section 2. The upper and lower sets of steel wire ropes 23 are used to connect the sliding ring 18 to the bottom of the fourth-stage lifting section 4 and the second-stage lifting section 2, respectively. This allows the multi-section lifting device to be connected via the third-stage lifting section 3 after further elevation, thereby improving the connection stability between the second-stage lifting section 2, the third-stage lifting section 3, and the fourth-stage lifting section 4, and thus enhancing the overall device stability. This promotes the stable lifting and installation of the radar antenna.

[0037] As a technical optimization of the present invention, a through groove 24 is provided in the middle of the fixed block 20, and shaft sliding grooves are provided on the inner walls of both sides of the through groove 24. An elongated movable groove 25 is provided on the fixed block 20 below the two shaft sliding grooves. The through groove 24 is used for the installation of the rotating block 27, and the movable groove 25 facilitates the rotation of the connecting rod 38.

[0038] As a technical optimization of the present invention, the safety mechanism 26 includes a rotating block 27 and a pressing plate 32. Annular blocks 29 are slidably connected in two shaft grooves. A rotating block 27 is fixedly connected between the two annular blocks 29. A through hole 28 is opened in the center of the rotating block 27. The first lifting rope 12 passes through the through hole 28. The top and bottom of the inner ring of the annular block 29 are symmetrically provided with mating grooves 30. Annular cylinders 31 are slidably connected to the center of the annular block 29 through two mating strips that are slidably connected to the mating grooves 30. Both annular cylinders 31 are inserted into the through hole 28. The pressing plate 32 is fixedly connected to the opposite face of the two annular cylinders 31. The insurance mechanism 26 monitors the movement speed of each lifting section in real time by installing displacement sensors in each lifting section of the multi-stage hydraulic lifting device. In the event of an accident causing a lifting section to slip rapidly, the electric cylinder 39 can drive two connecting rods 38 to rotate, thereby driving the rotating shaft 34, insert rod 35, and locking block 37 to rotate. Since the locking block 37 is slidably connected to the first threaded groove 33, the rotating locking block 37 can push the two annular cylinders 31 and the two extrusion plates 32 closer together, ultimately causing the two extrusion plates 32 to tighten. When the first lifting rope 12 is attached to the outer wall, the two extrusion plates 32 apply pressure to the first lifting rope 12 and cannot move closer. The rotating shaft 34 and the insertion rod 35 are restricted and cannot continue to rotate. The electric cylinder 39 continues to extend, which can push the connecting rod 38, the rotating shaft 34, the extrusion plates 32 and the rotating block 27 to rotate as a whole. This causes the rotating block 27 to rotate through the through hole 28 and lock the first lifting rope 12. This creates a locking effect between the first lifting rope 12 and the three-stage lifting section 3, preventing the entire device from continuing to descend rapidly and spreading danger.

[0039] As a technical optimization of the present invention, the outer ring of the side wall of the annular block 29 is rotatably connected to a rotating shaft 34 through an annular groove. Two rotating shafts 34 are slidably connected to two shaft grooves respectively. A rod 35 is fixedly connected to the center of the annular cylinder 31 near the center of the rotating shaft 34. A second threaded groove 36 is formed on the outer wall of the rod 35, and a locking block 37 is fixedly connected to the center of the second threaded groove 36. A first threaded groove 33 is formed on the outer wall of the annular cylinder 31, and the first threaded groove 33 and the second threaded groove 36 have opposite spiral directions. The end of the locking block 37 is slidably connected to the first threaded groove 33. The rotating rod 35 and the locking block 37 slide along the first threaded groove 33, thereby pushing the annular cylinder 31 and the extrusion plate 32 to move. The second threaded groove 36 is used in conjunction to facilitate the installation of the locking block 37 and to distinguish the direction.

[0040] As a technical optimization of the present invention, a connecting rod 38 is fixedly connected to the bottom of the rotating shaft 34. The bottom of the connecting rod 38 passes through the movable groove 25, and the telescopic end of the electric cylinder 39 is rotatably connected to the bottom end of the connecting rod 38. The fixed end of the electric cylinder 39 is rotatably connected to the bottom end of the fixed block 20 through a bracket. During normal operation, the connecting rod 38 and the rotating block 27 can move slightly along the shaft slide groove and the movable groove 25 as the first lifting rope 12 moves, and the electric cylinder 39 can be kept stable by the rotation of the connecting rod 38 and the bracket.

[0041] In use, a radar antenna is mounted on the top of the five-stage lifting section 5. The radar antenna is then raised to a higher position using a multi-stage hydraulic lifting device. The bottom of the hydraulic cylinder 9 is fixedly connected to the bottom of the second-stage lifting section 2 via a mounting block 8 and a second fixing rod 7. The end of the hydraulic rod 10 is fixedly connected to the bottom of the first-stage lifting section 1 via a first fixing rod 6. The bottom of the first-stage lifting section 1 is fixed to the ground. Firstly, the hydraulic cylinder 9 is activated to extend the hydraulic rod 10. The hydraulic rod 10 then pushes the hydraulic cylinder 9 and the second-stage lifting section 2 upwards. Simultaneously, the first pulley 11 pushes the first lifting rope. When the first lifting rope 12 is raised, the end of the first lifting rope 12 can pull the connecting block 19, the third-stage lifting section 3, and the second pulley to rise. This will drive the end of the second lifting rope 13 to pull the fourth-stage lifting section 4 and the third pulley to rise. Similarly, the third pulley can drive the end of the third lifting rope 14 to pull the fifth-stage lifting section 5 to rise. When the multi-stage lifting device is raised, the first descent rope 15, the second descent rope 16, and the third descent rope 17 are passively moved by the lifting force of the second-stage lifting section 2, the third-stage lifting section 3, the fourth-stage lifting section 4, and the fifth-stage lifting section 5. Finally, the radar antenna can be sent to a high place for installation.

[0042] After installation, the connection between the radar antenna and the top of the fifth-stage lifting section 5 is removed. At this time, the multi-stage hydraulic lifting device is retrieved. The hydraulic rod 10 is retracted, and the hydraulic cylinder 9 and the mounting block 8 can pull the second-stage lifting section 2 and the sixth pulley down. The sixth pulley can then drive the end of the third descent rope 17 to pull the third-stage lifting section 3 and the fifth pulley down. The descent of the fifth pulley can then drive the end of the second descent rope 16 to pull the fourth-stage lifting section 4 and the fourth pulley down. The descent of the fourth pulley can then drive the end of the first descent rope 15 to pull the fifth-stage lifting section 5 down. Finally, the multi-stage hydraulic lifting device can be completely retrieved synchronously. Because the first lifting rope 12 loses power from the first pulley 11 when the multi-stage lifting device descends, the first lifting rope 12, the second lifting rope 13, and the third lifting rope 14 are passively moved by the descent of the second-stage lifting section 2, the third-stage lifting section 3, the fourth-stage lifting section 4, and the fifth-stage lifting section 5.

[0043] During the lifting process of the multi-stage hydraulic lifting device, the third-stage lifting section 3 and the connecting block 19 rise synchronously, causing the sliding ring 18 to slide synchronously along the outer wall of the hydraulic cylinder 9. At this time, the second-stage lifting section 2 and the fourth-stage lifting section 4 rise synchronously, and the distance between their bottoms and the bottoms of the third-stage lifting section 3 gradually increases. This allows the bottoms of the second-stage lifting section 2 and the fourth-stage lifting section 4 to pull two sets of eight steel wire ropes 23, causing the two rotating rings 21 to rotate around the inside of the sliding ring 18. This, in turn, causes the coil spring 22 to be compressed and store energy. Finally, the second-stage lifting section 2 and the fourth-stage lifting section 4 are raised to their final positions. The wire rope 23 is stretched to its limit, thereby tightening the bottom of the second-stage lifting section 2, the fourth-stage lifting section 4, and the third-stage lifting section 3 through the eight wire ropes 23, improving the overall stability of the device. During the descent of the multi-stage hydraulic lifting device, the sliding ring 18 slides down synchronously along the outer wall of the hydraulic cylinder 9, the second-stage lifting section 2 and the fourth-stage lifting section 4 rise synchronously and the distance between their bottoms and the bottom of the third-stage lifting section 3 gradually decreases. The eight wire ropes 23 lose their force, the coil spring 22 restores its strength and drives the rotating ring 21 to rotate, thereby driving the eight wire ropes 23 to be retracted into the storage slot.

[0044] After the multi-stage hydraulic lifting device has raised the height, if an accident occurs, such as the breakage of the second descent rope 16, causing the second-stage lifting section 2, third-stage lifting section 3, fourth-stage lifting section 4, and fifth-stage lifting section 5 to lose control and rapidly slide down, the displacement sensor will detect that the descent speed of the out-of-control components is greater than the normal descent speed. The displacement sensor will then transmit a signal to the controller, which will control the extension ends of the two electric cylinders 39 to extend, pushing the two connecting rods 38 to rotate, thereby pushing the rotating shaft 34, the insert rod 35, and the locking block 37 to rotate. Since the locking block 37 is slidably connected to the first threaded groove 33, the rotating locking block 37 can push the two... The annular cylinder 31 and the two extrusion plates 32 approach each other, and eventually the two extrusion plates 32 are pressed tightly against the outer wall of the first lifting rope 12. At this time, the two extrusion plates 32 exert pressure on the first lifting rope 12 and cannot continue to approach. The rotating shaft 34 and the insertion rod 35 are restricted and cannot continue to rotate. The electric cylinder 39 continues to extend, which can push the connecting rod 38, the rotating shaft 34, the extrusion plates 32 and the rotating block 27 to rotate as a whole. This causes the rotating block 27 to rotate through the through hole 28 and lock the first lifting rope 12. This creates a locking effect between the first lifting rope 12 and the three-stage lifting section 3, preventing the entire device from continuing to descend rapidly and spreading danger.

[0045] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0046] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage hydraulic lifting device for radar antennas, comprising a primary lifting section (1) and a hydraulic cylinder (9), characterized in that: The first-stage lifting section (1) is a rectangular hollow structure. The top inner wall of the first-stage lifting section (1) is slidably connected to the second-stage lifting section (2). The top inner wall of the second-stage lifting section (2) is slidably connected to the third-stage lifting section (3). The top inner wall of the third-stage lifting section (3) is slidably connected to the fourth-stage lifting section (4). The top inner wall of the fourth-stage lifting section (4) is slidably connected to the fifth-stage lifting section (5). A first fixed rod (6) is fixedly connected to both sides of the bottom inner wall of the first-stage lifting section (1). Two second fixed rods (7) are fixedly connected to both sides of the bottom inner wall of the second-stage lifting section (2). A mounting block (8) is fixedly connected to the middle of the two second fixed rods (7). A hydraulic cylinder (9) is fixedly mounted on the top of the mounting block (8). The hydraulic rod of the hydraulic cylinder (9) is... 10) The end is fixedly connected to the center of the first fixed rod (6), the top of the hydraulic cylinder (9) is rotatably connected to the first pulley (11), the bottom inner wall of the three-stage lifting section (3) is fixedly connected to the connecting block (19), the top of the first pulley (11) is slidably connected to the first lifting rope (12), one end of the first lifting rope (12) is fixedly connected to the top of the connecting block (19), the other end of the first lifting rope (12) is fixedly connected to one side of the first fixed rod (6), the side of the connecting block (19) close to the hydraulic cylinder (9) is fixedly connected to the sliding ring (18) sleeved on the outer wall of the hydraulic cylinder (9), the side of the sliding ring (18) away from the connecting block (19) is fixedly connected to the fixing block (20), and the fixing block (20) is provided with a safety mechanism (26).

2. The multi-stage hydraulic lifting device for radar antennas according to claim 1, characterized in that: The top of the third-stage lifting section (3) is rotatably connected to a second pulley at the middle of one side. The top of the second pulley is slidably connected to a second lifting rope (13). One end of the second lifting rope (13) is fixedly connected to the bottom inner wall of the second-stage lifting section (2), and the other end of the second lifting rope (13) is fixedly connected to the bottom outer wall of the fourth-stage lifting section (4). The top of the fourth-stage lifting section (4) is rotatably connected to a third pulley at the middle of the side away from the second pulley. The top of the third pulley is slidably connected to a third lifting rope (14). One end of the third lifting rope (14) is fixedly connected to the bottom inner wall of the third-stage lifting section (3), and the other end of the third lifting rope (14) is fixedly connected to the bottom outer wall of the fifth-stage lifting section (5).

3. A multi-stage hydraulic lifting device for a radar antenna according to claim 2, characterized in that: The bottom of the fourth-stage lifting section (4) is rotatably connected to two fourth pulleys on both sides. The two fourth pulleys are located on both sides of the third lifting rope (14). The bottom of the two fourth pulleys is slidably connected to a first descending rope (15). One end of the two first descending ropes (15) is fixedly connected to the inner wall of the top of the third-stage lifting section (3), and the other end of the two first descending ropes (15) is fixedly connected to the outer wall of the top of the fifth-stage lifting section (5). The bottom of the third-stage lifting section (3) is rotatably connected to two fifth pulleys on both sides. The two fifth pulleys are located on both sides of the second lifting rope (13). The bottom of the two fifth pulleys is slidably connected to a second descending rope (14). 16) One end of the two second descending ropes (16) is fixedly connected to the inner wall of the top of the second-stage lifting section (2), and the other end of the two second descending ropes (16) is fixedly connected to the outer wall of the top of the fourth-stage lifting section (4). Two sixth pulleys are rotatably connected to the bottom of the second-stage lifting section (2). The two sixth pulleys are located on both sides of the third lifting rope (14). The bottom of the two sixth pulleys is slidably connected to the third descending rope (17). One end of the two third descending ropes (17) is fixedly connected to the inner wall of the top of the first-stage lifting section (1), and the other end of the two third descending ropes (17) is fixedly connected to the outer wall of the top of the third-stage lifting section (3).

4. A multi-stage hydraulic lifting device for a radar antenna according to claim 1, characterized in that: The sliding ring (18) has a hollow structure inside. The top and bottom of the sliding ring (18) are rotatably connected to a symmetrical rotating ring (21). One end of a coil spring (22) is fixedly connected to the inner side wall of the rotating ring (21), and the other end of the coil spring (22) is fixedly connected to the inner side wall of the sliding ring (18).

5. A multi-stage hydraulic lifting device for a radar antenna according to claim 4, characterized in that: The rotating ring (21) has four annular storage slots with decreasing diameters. Each of the four storage slots contains a steel wire rope (23). The ends of the four upper steel wire ropes (23) pass through the top of the rotating ring (21) and the sliding ring (18), respectively. The ends of the four upper steel wire ropes (23) are fixedly connected to the bottom inner wall of the fourth-stage lifting section (4). The ends of the four lower steel wire ropes (23) pass through the bottom of the rotating ring (21) and the sliding ring (18), respectively. The ends of the four lower steel wire ropes (23) are fixedly connected to the bottom inner wall of the second-stage lifting section (2).

6. A multi-stage hydraulic lifting device for a radar antenna according to claim 1, characterized in that: The fixed block (20) has a through groove (24) in the middle, and shaft sliding grooves are provided on the inner walls of both sides of the through groove (24). The fixed block (20) below the two shaft sliding grooves has a long strip-shaped movable groove (25).

7. A multi-stage hydraulic lifting device for a radar antenna according to claim 6, characterized in that: The safety mechanism (26) includes a rotating block (27) and a pressing plate (32). An annular block (29) is slidably connected in two shaft grooves. A rotating block (27) is fixedly connected between the two annular blocks (29). A through hole (28) is opened in the center of the rotating block (27). The first lifting rope (12) passes through the through hole (28). The top and bottom of the inner ring of the annular block (29) are symmetrically provided with mating grooves (30). An annular cylinder (31) is slidably connected to the center of the annular block (29) through two mating strips that are slidably connected to the mating grooves (30). Both annular cylinders (31) are inserted into the through hole (28). The pressing plate (32) is fixedly connected to the opposite face of the two annular cylinders (31).

8. A multi-stage hydraulic lifting device for a radar antenna according to claim 7, characterized in that: The outer ring of the side wall of the annular block (29) is rotatably connected to a rotating shaft (34) through an annular groove. The two rotating shafts (34) are slidably connected to two shaft grooves respectively. The rotating shaft (34) is fixedly connected to the center of the side of the annular cylinder (31) with a sliding rod (35) slidably connected to the center of the annular cylinder (31). The outer wall of the rod (35) is provided with a second threaded groove (36). The center of the second threaded groove (36) is fixedly connected with a locking block (37). The outer wall of the annular cylinder (31) is provided with a first threaded groove (33). The first threaded groove (33) and the second threaded groove (36) have opposite spiral directions. The end of the locking block (37) is slidably connected to the first threaded groove (33).

9. A multi-stage hydraulic lifting device for a radar antenna according to claim 8, characterized in that: The bottom of the rotating shaft (34) is fixedly connected to a connecting rod (38), the bottom of the connecting rod (38) passes through the movable groove (25), the bottom end of the connecting rod (38) is rotatably connected to the telescopic end of the electric cylinder (39), and the fixed end of the electric cylinder (39) is rotatably connected to the bottom end of the fixed block (20) through a bracket.

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