Swing type damper

Abstract

The swing type damper is applied to the field of wind power vibration reduction and comprises an upper cross beam installed on the inner wall of a tower drum, a vibration reduction device used for reducing swing of the tower drum is arranged on the upper cross beam, and the vibration reduction device comprises a swing assembly which is arranged on the upper cross beam and used for swinging in the swing direction of the tower drum. The damping device further comprises a transmission assembly used for decomposing motion of the swing assembly, the transmission assembly is arranged at the end, away from the upper beam, of the swing assembly, the swing assembly comprises a mounting frame arranged on the upper beam, the mounting frame is in spherical hinge connection with a pendulum bob frame, and the end, away from the upper beam, of the pendulum bob frame is in spherical hinge connection with the transmission assembly. A lower beam is arranged at the end, away from the upper beam, of the transmission assembly and installed on the inner wall of the tower drum. The vibration damping device is provided with a frequency increasing unit used for increasing the swing frequency of the pendulum bob. The swing type damper has the technical effects that the swing period of the pendulum bob frame is shortened through the frequency increasing unit, the swing frequency of the pendulum bob frame is increased, the frequency of the swing type damper is matched with the swing frequency of the tower barrel, and therefore the damping effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power vibration reduction, and in particular to a swing damper. Background Art

[0002] A swing damper is a device used to reduce the tower's sway caused by wind or other external forces. The swing frequency of a swing damper is affected by the pendulum length. The damper achieves optimal vibration reduction when the swing frequency is close to the main structural frequency, creating a resonance.

[0003] Existing oscillating dampers typically consist of a pendulum frame constructed from several stacked masses, and a connecting structure connecting the pendulum frame to the tower body. The damper's oscillation frequency matches the tower's, and the pendulum frame oscillates as the tower swings. This oscillation is then decomposed by a transmission mechanism to achieve vibration reduction.

[0004] Because the pendulum frame of a swing damper is long, and the center of gravity of the mass on the pendulum frame is low, the swing damper's swing frequency is low during use, making it difficult to cope with the higher main structural frequencies. Existing methods for increasing the swing frequency typically involve shortening the damper's pendulum length. However, this approach affects the damper's structural design, reducing its performance and resulting in poor vibration reduction. Summary of the Invention

[0005] In order to help solve the problem that shortening the pendulum length of the damper to increase the swing frequency affects the formation structure of the damper, reduces the performance of the damper, and leads to poor vibration reduction effect, the present application provides a swing damper, which adopts the following technical solution: it includes an upper crossbeam installed on the inner wall of the tower, the upper crossbeam is provided with a vibration reduction device for reducing the swing of the tower, the vibration reduction device includes a swing assembly arranged on the upper crossbeam for swinging in the swing direction of the tower, the vibration reduction device also includes a transmission assembly for decomposing the movement of the swing assembly, the transmission assembly is arranged at an end of the swing assembly away from the upper crossbeam, the swing assembly includes a mounting frame arranged on the upper crossbeam, the mounting frame is connected to a pendulum frame with a ball hinge, the end of the pendulum frame away from the upper crossbeam is connected to the transmission assembly with a ball hinge, the end of the transmission assembly away from the upper crossbeam is provided with a lower crossbeam, and the lower beam is installed on the inner wall of the tower;

[0006] The vibration reduction device is provided with a frequency increasing unit for increasing the swing frequency of the pendulum.

[0007] Through the above technical solution, when the tower swings, the pendulum frame connected to the mounting frame by a ball joint transmits the swing of the tower to the transmission assembly. The transmission assembly decomposes the swing direction of the swing frame, converts the three-dimensional swing motion into linear motion, and decomposes the swing of the tower into multiple directions. The frequency-increasing unit is used to reduce the swing period of the pendulum frame, thereby increasing the swing frequency and stiffness of the pendulum frame, achieving the effect of multi-directional vibration reduction, achieving the purpose of increasing resistance and suppressing vibration, and improving the stability and safety of the tower.

[0008] In a specific embodiment, the pendulum frame includes a mass block, an end of the mass block facing the upper beam is provided with a swing arm, and an end of the mass block facing the lower beam is connected to a transmission assembly with a ball joint;

[0009] The frequency increasing unit includes a horizontal plate which is passed through the mounting frame and connected to the mounting frame by a ball joint. A plurality of first compression springs are provided on the surface of the horizontal plate facing the swing arm. The ends of the plurality of first compression springs which are away from the horizontal plate are all provided on the swing arm.

[0010] Through the above technical solution, when the tower swings and drives the pendulum frame to swing, the first compression spring is squeezed and compressed during the swing, thereby increasing the reaction force on the swing arm, reducing the swing period of the swing arm, thereby increasing the swing frequency and stiffness of the pendulum frame, achieving the effect of multi-directional vibration reduction, achieving the purpose of increasing resistance and suppressing vibration, and improving the stability and safety of the tower.

[0011] In a specific feasible implementation scheme, a plurality of first limiting sleeves respectively matching the plurality of first compression springs are provided on the surface of the horizontal plate facing the mass block, and a plurality of second limiting sleeves respectively matching the first compression springs are provided on one end of the swing arm facing the upper crossbeam, and the two ends of the plurality of first compression springs are respectively located at the inner edges of the plurality of first limiting sleeves and the plurality of second limiting sleeves.

[0012] Through the above technical solution, the first limiting sleeve and the second limiting sleeve limit the two ends of the first compression spring, reducing the possibility of excessive deviation of the first compression spring during swinging and improving the stability of the swing arm during swinging.

[0013] In a specific feasible implementation scheme, the transmission assembly includes a mounting block and a transmission bracket arranged on the lower cross beam, the transmission bracket is rotatably connected to the two first screw rods and the two second screw rods, the two first screw rods are parallel to each other, the two second screw rods are parallel to each other, the two first screw rods are located between the two second screw rods, the extension lines of the two first screw rods are perpendicular to the extension lines of the two second screw rods, the mounting block is slidably connected to a transmission frame, the nuts of the two first screw rods are respectively provided with a first sliding frame, the nuts of the two second screw rods are respectively provided with a second sliding frame, the transmission frame is simultaneously connected to the two first sliding frames and the two second sliding frames, the end of the pendulum frame away from the upper cross beam is connected to the mounting block ball hinge, the output end of the ball hinge connection is provided with a sliding rod, the mounting block is provided with a sliding hole matching the sliding rod, and the sliding rod is penetrated into the sliding hole;

[0014] The transmission frame includes a first transmission rod and a second transmission rod, wherein both ends of the first transmission rod are connected to the two first sliding frames at the same time, and the first transmission rod is slidably connected to the mounting block, and both ends of the second transmission rod are connected to the two second sliding frames at the same time, and the second transmission rod is slidably connected to the mounting block;

[0015] The frequency increasing unit further includes a second compression spring sleeved on the outer edge of the first transmission rod and a third compression spring sleeved on the outer edge of the second transmission rod.

[0016] Through the above technical solution, when the tower swings, the pendulum frame transmits the swing to the mounting block, and the mounting block can slide along the direction of the first transmission rod and the second transmission rod, and can also slide along the composite direction formed by the first transmission rod and the second transmission rod. During the sliding process, the mounting block squeezes the second compression spring and the third compression spring, and the second compression spring and the third compression spring provide a reaction force to the mounting block, thereby reducing the movement period of the mounting block and increasing the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the swing frequency of the tower, thereby generating a damping effect, realizing the decomposition of the swing direction of the swing arm frame, converting the three-dimensional swing motion into linear motion, and decomposing the swing of the tower into multiple directions, thereby achieving the effect of multi-directional vibration reduction.

[0017] In a specific feasible implementation scheme, the transmission assembly includes a mounting block and a transmission bracket arranged on the lower cross beam, the transmission bracket is rotatably connected to the two first screw rods and the two second screw rods, the two first screw rods are parallel to each other, the two second screw rods are parallel to each other, the two first screw rods are located between the two second screw rods, the extension lines of the two first screw rods are perpendicular to the extension lines of the two second screw rods, the mounting block is slidably connected to a transmission frame, the nuts of the two first screw rods are respectively provided with a first sliding frame, the nuts of the two second screw rods are respectively provided with a second sliding frame, the transmission frame is simultaneously connected to the two first sliding frames and the two second sliding frames, the end of the pendulum frame away from the upper cross beam is connected to the mounting block ball hinge, the output end of the ball hinge connection is provided with a sliding rod, the mounting block is provided with a sliding hole matching the sliding rod, and the sliding rod is penetrated into the sliding hole;

[0018] The frequency increasing unit also includes two reducers respectively arranged at one end of the first screw rod, the output end of the reducer is keyed to a coil spring shaft, the outer edge of the coil spring shaft is sleeved with a coil spring tube, the coil spring shaft and the coil spring tube are connected by a first coil spring, the end of the coil spring tube facing away from the reducer is provided with a flywheel tube, the end of the coil spring shaft facing away from the reducer is keyed to a flywheel shaft, the outer edge of the flywheel shaft is sleeved with a plurality of flywheel plates, and the plurality of flywheel plates are located as a whole at the inner edge of the flywheel tube.

[0019] Through the above technical solution, the number of flywheel pieces is adjusted according to the test frequency and tower model. The first screw rotates through the reducer to drive the coil spring shaft to rotate. The rotation of the coil spring shaft drives the first coil spring to rotate. The first coil spring will provide a reaction force, thereby increasing the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the swing frequency of the tower, thereby producing a damping effect.

[0020] In a specific embodiment, a second coil spring is provided between the coil spring shaft and the coil spring barrel, and the second coil spring is located between the first coil spring and a plurality of flywheel plates.

[0021] Through the above technical solution, the second coil spring further increases the reaction force, thereby increasing the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the tower swing frequency, thereby generating a damping effect.

[0022] In a specific embodiment, a spacer is sleeved on the outer edge of the coil spring shaft, and the spacer is located between the first coil spring and the second coil spring.

[0023] Through the above technical solution, the spacer separates the first coil spring and the second coil spring, limits the positions of the first coil spring and the second coil spring, and reduces the possibility of mutual interference between the first coil spring and the second coil spring.

[0024] In a specific implementation scheme, a bearing is provided on the outer edge of the coil spring shaft, a retaining ring groove is provided on the inner wall of the coil spring cylinder, an elastic retaining ring matching the retaining ring groove is provided in the retaining ring groove, and the bearing is located between the elastic retaining ring and the first coil spring.

[0025] Through the above technical solution, the bearing reduces the friction between the spring tube and the spring shaft, reduces energy loss and wear, makes the rotation of the spring shaft smoother, and thus increases the service life. The retaining ring groove reduces the possibility of the bearing loosening or falling off during movement, and improves the stability of the bearing installation.

[0026] In a specific implementation scheme, the outer edge of the coil spring shaft is sequentially sleeved with a retaining ring, a locking washer and a locking nut, the retaining ring contacts the bearing at one end facing the first coil spring, and the locking washer is tightened between the retaining ring and the locking nut.

[0027] Through the above technical solution, the retaining ring plays a limiting role on the bearing, and the locking washer reduces the possibility of the bearing loosening or falling off during movement by increasing the contact area between the retaining ring and the locking nut, thereby further improving the stability of the bearing installation.

[0028] In a specific feasible implementation scheme, the transmission assembly includes a mounting block and a transmission bracket arranged on the lower cross beam, the transmission bracket is rotatably connected to the two first screw rods and the two second screw rods, the two first screw rods are parallel to each other, the two second screw rods are parallel to each other, the two first screw rods are located between the two second screw rods, the extension lines of the two first screw rods are perpendicular to the extension lines of the two second screw rods, the mounting block is slidably connected to a transmission frame, the nuts of the two first screw rods are respectively provided with a first sliding frame, the nuts of the two second screw rods are respectively provided with a second sliding frame, the transmission frame is simultaneously connected to the two first sliding frames and the two second sliding frames, the end of the pendulum frame away from the upper cross beam is connected to the mounting block ball hinge, the output end of the ball hinge connection is provided with a sliding rod, the mounting block is provided with a sliding hole matching the sliding rod, and the sliding rod is penetrated into the sliding hole;

[0029] The transmission frame includes a first transmission rod and a second transmission rod, wherein both ends of the first transmission rod are connected to the two first sliding frames at the same time, and the first transmission rod is slidably connected to the mounting block, and both ends of the second transmission rod are connected to the two second sliding frames at the same time, and the second transmission rod is slidably connected to the mounting block;

[0030] The frequency increasing unit further comprises a second compression spring sleeved on the outer edge of the first transmission rod and a third compression spring sleeved on the outer edge of the second transmission rod;

[0031] The frequency increasing unit also includes two reducers respectively arranged at one end of the first screw rod, the output end of the reducer is keyed to a coil spring shaft, the outer edge of the coil spring shaft is sleeved with a coil spring tube, the coil spring shaft and the coil spring tube are connected by a first coil spring, the end of the coil spring tube facing away from the reducer is provided with a flywheel tube, the end of the coil spring shaft facing away from the reducer is keyed to a flywheel shaft, the outer edge of the flywheel shaft is sleeved with a plurality of flywheel plates, and the plurality of flywheel plates are located as a whole at the inner edge of the flywheel tube.

[0032] Through the above technical solution, the mounting block squeezes the second compression spring and the third compression spring during the sliding process, and the second compression spring and the third compression spring provide a reaction force to the mounting block, thereby reducing the movement period of the mounting block, increasing the swing frequency of the pendulum frame, and adapting the frequency of the swing damper to the swing frequency of the tower, thereby producing a damping effect; the first screw rotates through the reducer to drive the coil spring shaft to rotate, and the rotation of the coil spring shaft drives the first coil spring to rotate. The first coil spring will provide a reaction force, thereby further increasing the swing frequency of the pendulum frame.

[0033] In summary, the present application has the following beneficial technical effects: when the tower swings, the pendulum frame connected to the mounting frame by a ball joint transmits the swing of the tower to the transmission assembly, the transmission assembly decomposes the swing direction of the swing frame, converts the three-dimensional swing motion into linear motion, and decomposes the swing of the tower into multiple directions. The frequency-increasing unit is used to reduce the swing period of the pendulum frame and increase the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the swing frequency of the tower, thereby producing a damping effect while achieving a multi-directional vibration reduction effect, achieving the purpose of increasing resistance and suppressing vibration, and improving the stability and safety of the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0035] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0036] Figure 3 It is a structural diagram for reflecting the second compression spring in an embodiment of the present application.

[0037] Figure 4 It is a cross-sectional schematic diagram used to illustrate the first coil spring in the embodiment of the present application.

[0038] Reference numerals: 1, upper crossbeam; 2, swing assembly; 3, transmission assembly; 4, mounting bracket; 5, locking washer; 6, locking nut; 7, mass block; 8, swing arm; 9, cross plate; 10, first compression spring; 11, first limiting sleeve; 12, second limiting sleeve; 13, transmission bracket; 14, first screw rod; 15, second screw rod; 16, mounting block; 17, first sliding frame; 18, second sliding frame; 19, transmission frame; 20, First transmission rod; 21. Second transmission rod; 22. Second compression spring; 23. Third compression spring; 24. Reducer; 25. Coil spring shaft; 26. Coil spring cylinder; 27. First coil spring; 28. Flywheel cylinder; 29. ​​Flywheel shaft; 30. Flywheel plate; 31. Second coil spring; 32. Spacer; 33. Bearing; 34. Retaining ring groove; 35. Circlip; 36. Retaining ring; 37. Reinforcing beam; 38. First guide rail; 39. Second guide rail. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-4 This application is described in further detail.

[0040] The embodiment of the present application discloses a swing damper.

[0041] Reference Figure 1 The swing damper includes an upper crossbeam 1 mounted on the inner wall of the tower. Several reinforcement beams 37 are bolted to the upper crossbeam 1. These reinforcement beams 37 are evenly distributed throughout the upper crossbeam 1. The number of reinforcement beams 37 can be adjusted based on actual usage. The ends of the reinforcement beams 37, distal from the upper crossbeam 1, are connected to the inner wall of the tower. The evenly distributed reinforcement beams 37 enhance the stability of the upper crossbeam 1, making it more secure when mounted on the inner wall of the tower and simultaneously improving the stability of the tower.

[0042] Reference Figure 1 The upper crossbeam 1 is equipped with a vibration damping device for reducing tower swing, and a frequency-increasing unit for increasing the pendulum's swing frequency. The vibration damping device includes a swinging assembly 2 mounted on the upper crossbeam 1 and configured to swing in the direction of the tower's swing. The vibration damping device also includes a transmission assembly 3 for decomposing the motion of the swinging assembly 2. The transmission assembly 3 is mounted on the end of the swinging assembly 2 away from the upper crossbeam 1. A lower crossbeam is also mounted on the end of the transmission assembly 3 away from the upper crossbeam 1. The lower crossbeam is bolted to the inner wall of the tower.

[0043] Reference Figure 1 The swing assembly 2 includes a mounting bracket 4 bolted to the upper crossbeam 1. The mounting bracket 4 may be U-shaped, with the open end of the mounting bracket 4 connected to the upper crossbeam 1. The mounting bracket 4 is connected to the pendulum frame by a ball joint. The pendulum frame includes a mass block 7. The end of the mass block 7 facing the upper crossbeam 1 is provided with a swing arm 8. The end of the mass block 7 facing the lower crossbeam is connected to the transmission assembly 3 by a ball joint.

[0044] Reference Figure 1 The transmission assembly 3 includes a mounting block 16 and a transmission bracket 13 disposed on the lower crossbeam. The end of the pendulum frame away from the upper crossbeam 1 is connected to the mounting block 16 by a ball joint. The output end of the ball joint is provided with a slide rod. The mounting block 16 is provided with a sliding hole that matches the slide rod, and the slide rod is inserted into the sliding hole. The transmission bracket 13 is rotatably connected to two first screw rods 14 and two second screw rods 15. The two first screw rods 14 are parallel to each other, and the two second screw rods 15 are parallel to each other. The two first screw rods 14 are located between the two second screw rods 15, and the extension lines of the two first screw rods 14 are perpendicular to the extension lines of the two second screw rods 15. The mounting block 16 is slidably connected to a transmission frame 19. The nuts of the two first screw rods 14 are respectively provided with first sliding frames 17, and the nuts of the two second screw rods 15 are respectively provided with second sliding frames 18. The transmission frame 19 is simultaneously connected to the two first sliding frames 17 and the two second sliding frames 18.

[0045] Reference Figure 1 A first guide rail 38, which matches the size of the first lead screw 14, is bolted to the transmission bracket 13 and is parallel to the first lead screw. The first sliding bracket 17 is slidably connected to the first guide rail 38. A second guide rail 39, which matches the size of the second lead screw 15, is bolted to the transmission bracket 13 and is slidably connected to the second guide rail 39. The second guide rail 39 is parallel to the second lead screw 15. The first sliding bracket 17 slides along the first guide rail 38, and the second sliding bracket 18 slides along the second guide rail 39. The first guide rail 38 and the second guide rail 39 improve the sliding stability of the first and second sliding brackets 17 and 18.

[0046] Reference Figure 1 The transmission frame 19 includes a first transmission rod 20 and a second transmission rod 21. Both ends of the first transmission rod 20 are connected to the two first sliding frames 17 at the same time, and both ends of the second transmission rod 21 are connected to the two second sliding frames 18 at the same time. The first transmission rod 20 and the second transmission rod 21 are both passed through the mounting block 16 and are slidably connected to the mounting block 16. The first transmission rod 20 is parallel to the first screw rod 14, and the second transmission rod 21 is parallel to the second screw rod 15. The number of the first transmission rod 20 and the second transmission rod 21 is set to two, the mounting block 16 is located between the two first transmission rods 20, and the mounting block 16 is located between the two second transmission rods 21. The two first transmission rods 20 and the two second transmission rods 21 can be set in two layers, one above the other.

[0047] Reference Figure 1Therefore, when the tower swings, the pendulum frame connected to the mounting frame 4 by a ball joint transmits the tower's swing through the swing arm 8 and the mass block 7 to the mounting block 16, and the slide rod slides up and down along the mounting block 16. The mounting block 16 can slide along the direction of the first transmission rod 20 and the second transmission rod 21, and can also slide along the combined direction formed by the first transmission rod 20 and the second transmission rod 21. When the nut of the first screw rod 14 slides along the first guide rail 38, the first screw rod 14 rotates on the transmission bracket 13. When the nut of the second screw rod 15 slides along the second guide rail 39, the second screw rod 15 rotates on the transmission bracket 13. This decomposes the swing direction of the swing arm 8, converts the three-dimensional swing motion into linear motion, and decomposes the swing of the damper inside the tower into multiple directions. The frequency increasing unit is used to reduce the swing period of the pendulum frame and increase the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the swing frequency of the tower. When the tower vibrates, a damping effect is generated to achieve the purpose of increasing resistance and suppressing vibration, thereby improving the stability and safety of the tower.

[0048] There are three ways to implement the frequency increasing unit in this application:

[0049] Reference Figure 1 and Figure 2 Method 1: The frequency-increasing unit includes a transverse plate 9 that is inserted into the mounting frame 4 and connected to the mounting frame 4 by a ball joint. Four first compression springs 10 are provided on the surface of the transverse plate 9 facing the swing arm 8. The ends of the four first compression springs 10 facing away from the transverse plate 9 are all provided on the swing arm 8. Four first limiting sleeves 11 that match the four first compression springs 10 respectively are bolted to the surface of the transverse plate 9 facing the mass block 7. Four second limiting sleeves 12 that match the first compression springs 10 respectively are bolted to the end of the swing arm 8 facing the upper crossbeam 1. The two ends of the four first compression springs 10 are respectively located at the inner edges of the first limiting sleeves 11 and the second limiting sleeves 12. The first limiting sleeves 11 and the second limiting sleeves 12 limit the two ends of the first compression spring 10, thereby reducing the possibility of excessive deviation of the first compression spring 10 during swinging and improving the stability of the swing arm 8 during swinging.

[0050] According to the frequency calculation formula 1:

[0051]

[0052] In the above formula: ω n is the target swing frequency; T is the swing period.

[0053] According to the stiffness calculation formula 2:

[0054]

[0055] Formula 3 is derived:

[0056]

[0057] In the above formula: k1 is the stiffness of the swing frame when it swings; J is the moment of inertia of the mass block about the swing center; L is the distance from the swing center to the center of the mass block; m is the mass of the swing mass block; r is the horizontal distance from the center of gravity of the swing to the spring; g is the acceleration due to gravity; ω n is the target swing frequency.

[0058] The frequency increase principle is analyzed as follows: According to formula 1, the smaller the swing period T, the smaller the target swing frequency ω n The larger the value, the larger the target swing frequency ω. n It will also increase with the increase of stiffness k1.

[0059] Based on the above principle analysis, the principle of frequency increase achieved in method 1 is: when the tower swings and drives the pendulum frame to swing, the first compression spring 10 is squeezed and compressed during the swing, thereby increasing the reaction force on the swing arm 8 during the swing, shortening the swing period of the swing arm 8, and increasing the bending stiffness of the pendulum frame suspension position, that is, the stiffness k1 in the above formulas 2 and 3 is increased, thereby increasing the swing frequency of the pendulum frame, so that it can cope with higher main structure frequencies on the basis of ensuring the length of the pendulum frame, achieve the effect of multi-directional vibration reduction, achieve the purpose of increasing resistance and suppressing vibration, and improve the stability and safety of the tower.

[0060] Reference Figure 1 and Figure 3 Method 2: The frequency increasing unit also includes two second compression springs 22 sleeved on the outer edge of the first transmission rod 20 and two third compression springs 23 sleeved on the outer edge of the second transmission rod 21. The two second compression springs 22 are respectively located between the two first sliding frames 17 and the mounting block 16, and the two third compression springs 23 are respectively located between the two second sliding frames 18 and the mounting block 16.

[0061] According to stiffness calculation formula 4:

[0062]

[0063] Formula 5 is derived:

[0064]

[0065] In the above formula: k2 is the stiffness of the swing frame when it swings; J is the moment of inertia of the mass block about the swing center; L is the distance from the swing center to the center of the mass block; m is the mass of the swing mass block; L c is the numerical distance from the center of swing to the spring installation; g is the acceleration due to gravity; ω n is the target swing frequency.

[0066] The frequency increase principle is analyzed as follows: According to formula 1, the smaller the swing period T, the smaller the target swing frequency ω n The larger the value, the larger the target swing frequency ω. n It will also increase with the increase of stiffness k2.

[0067] Based on the above principle analysis, the principle of frequency increase achieved in method 2 is as follows: when the tower swings, the pendulum frame transmits the swing to the mounting block 16. The mounting block 16 can slide along the direction of the first transmission rod 20 and the second transmission rod 21, and can also slide along the combined direction formed by the first transmission rod 20 and the second transmission rod 21. During the sliding process, the mounting block 16 squeezes the second compression spring 22 and the third compression spring 23. The second compression spring 22 and the third compression spring 23 provide a reaction force on the mounting block 16, increasing the restoring force of the pendulum frame during swing, reducing the swing period of the mounting block 16, and increasing the bending stiffness of the pendulum frame. That is, the stiffness k2 in the above formulas 4 and 5 increases, thereby increasing the swing frequency of the pendulum frame. This allows the pendulum frame to cope with higher main structure frequencies while ensuring the length of the pendulum frame. This reduces the movement period of the mounting block 16 and increases the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the tower swing frequency. When the tower vibrates, a damping effect is generated, achieving the purpose of increasing resistance and suppressing vibration, thereby improving the stability and safety of the tower.

[0068] Reference Figure 1 and Figure 4 Method 3: The frequency-increasing unit also includes two reducers 24, each mounted at one end of the first screw 14. A coil spring shaft 25 is keyed to the output end of the reducer 24. A coil spring barrel 26 is sheathed around the outer edge of the coil spring shaft 25. The coil spring shaft 25 and coil spring barrel 26 are connected by a first coil spring 27. A flywheel barrel 28 is mounted on the end of the coil spring barrel 26 facing away from the reducer 24. A flywheel shaft 29 is keyed to the end of the coil spring shaft 25 facing away from the reducer 24. The outer edge of the flywheel shaft 29 is sheathed with a plurality of flywheel discs 30. These circular discs 30 are bolted together and positioned integrally at the inner edge of the flywheel barrel 28. Operators can select flywheel discs 30 of appropriate thickness based on the tower model. The frequency-increasing unit is mounted on one end of the two second screws 15, similar to the end of the first screw 14.

[0069] Reference Figure 1 and Figure 4A second coil spring 31 is disposed between the coil spring shaft 25 and the coil spring barrel 26. The second coil spring 31 is positioned between the first coil spring 27 and the flywheels 30. This further increases the reaction force, further increasing the pendulum frame's swing frequency and enhancing the damping effect. A spacer 32 is sleeved around the outer edge of the coil spring shaft 25. The spacer 32 is positioned between the first coil spring 27 and the second coil spring 31. This spacer 32 separates the first coil spring 27 and the second coil spring 31, limiting their position and reducing the possibility of interference between them.

[0070] Reference Figure 1 and Figure 4 The outer edge of the coil spring shaft 25 is sleeved with a bearing 33, and the inner wall of the coil spring barrel 26 is provided with a retaining ring 34. The retaining ring 34 is provided with an elastic retaining ring 35 whose size matches the retaining ring 34. The bearing 33 is located between the elastic retaining ring 35 and the first coil spring 27. The bearing 33 reduces the friction between the coil spring barrel 26 and the coil spring shaft 25, reduces energy loss and wear, and makes the coil spring shaft 25 rotate more smoothly, thereby increasing its service life. The retaining ring groove 34 reduces the possibility of the bearing 33 loosening or falling off during movement, and improves the stability of the bearing 33 installation. The outer edge of the coil spring shaft 25 is sleeved with a retaining ring 36, a locking washer 6, and a locking nut 6 in sequence. The retaining ring 36 contacts the bearing 33 at the end facing the first coil spring 27, and the locking washer 6 is pressed tightly between the retaining ring 36 and the locking nut 6. The retaining ring 36 limits the bearing 33 , and the locking washer 6 reduces the possibility of the bearing 33 loosening or falling off during movement by increasing the contact area between the retaining ring 36 and the locking nut 6 , thereby further improving the stability of the installation of the bearing 33 .

[0071] According to the stiffness calculation formula six:

[0072]

[0073] Formula 7 is derived:

[0074]

[0075] In the above formula: k3 is the stiffness of the swing frame when it swings; J is the moment of inertia of the mass block about the swing center; L is the distance from the swing center to the center of the mass block; m is the mass of the swing mass block; k v L is the speed ratio from translation to rotation of the first and second screw rods; c is the numerical distance from the swing center to the transmission frame installation; g is the acceleration due to gravity; ω n is the target swing frequency.

[0076] The frequency increase principle is analyzed as follows: According to formula 1, the smaller the swing period T, the smaller the target swing frequency ω nThe larger the value, the larger the target swing frequency ω. n It will also increase with the increase of stiffness k3.

[0077] Based on the above principle analysis, the principle of frequency increase achieved in method three is as follows: the operator adjusts the number of flywheel plates 30 in the four flywheel tubes 28 according to the test frequency and tower model, the first screw 14 rotates through the reducer 24 to drive the coil spring shaft 25 to rotate, and the rotation of the coil spring shaft 25 drives the first coil spring 27 and the second coil spring 31 to rotate synchronously. After the first coil spring 27 and the second coil spring 31 rotate, they provide a reaction force, shortening the swing period of the swing arm 8 and increasing the rotational stiffness in the torsional direction, that is, k3 in formulas 6 and 7 is increased, thereby increasing the swing frequency of the pendulum frame, and being able to cope with higher main structure frequencies while ensuring the length of the pendulum frame. The movement period of the mounting block 16 is reduced, which also increases the swing frequency of the pendulum frame, so that the frequency of the swing damper is adapted to the tower swing frequency, and a damping effect is generated when the tower vibrates, thereby achieving the purpose of increasing resistance and suppressing vibration, thereby improving the stability and safety of the tower.

[0078] In addition, it should be noted that the three modes of the frequency-increasing unit in the embodiment of the present application can be used separately, in pairs, or in combination. Specific combinations include: mode 1 combined with mode 2; mode 1 combined with mode 3; mode 2 combined with mode 3; and mode 1, mode 2, and mode 3 combined.

[0079] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A swing damper, characterized in that: The invention comprises an upper crossbeam (1) mounted on the inner wall of a tower, wherein the upper crossbeam (1) is provided with a vibration reduction device for reducing the swing of the tower, wherein the vibration reduction device comprises a swing assembly (2) mounted on the upper crossbeam (1) for swinging in the swing direction of the tower, wherein the vibration reduction device further comprises a transmission assembly (3) for decomposing the movement of the swing assembly (2), wherein the transmission assembly (3) is arranged at an end of the swing assembly (2) away from the upper crossbeam (1), wherein the swing assembly (2) comprises a mounting frame (4) mounted on the upper crossbeam (1), wherein the mounting frame (4) is connected to a pendulum frame via a ball hinge, wherein the end of the pendulum frame away from the upper crossbeam (1) is connected to the transmission assembly (3) via a ball hinge, wherein the end of the transmission assembly (3) away from the upper crossbeam (1) is provided with a lower crossbeam, wherein the lower crossbeam is mounted on the inner wall of the tower; The vibration reduction device is provided with a frequency increasing unit for increasing the swing frequency of the pendulum.

2. The swing damper according to claim 1, characterized in that: The pendulum frame comprises a mass block (7), one end of the mass block (7) facing the upper crossbeam (1) is provided with a swing arm (8), and one end of the mass block (7) facing the lower crossbeam is connected to the transmission assembly (3) by a ball joint; The frequency-increasing unit comprises a transverse plate (9) which is inserted into the mounting frame (4) and is connected to the mounting frame (4) by a ball joint. A plurality of first compression springs (10) are provided on the surface of the transverse plate (9) facing the swing arm (8). The ends of the plurality of first compression springs (10) facing away from the transverse plate (9) are all provided on the swing arm (8).

3. The swing damper according to claim 2, characterized in that: A plurality of first limiting sleeves (11) respectively matching the plurality of first compression springs (10) are provided on the surface of the transverse plate (9) facing the mass block (7); a plurality of second limiting sleeves (12) respectively matching the first compression springs (10) are provided on one end of the swing arm (8) facing the upper crossbeam (1); and the two ends of the plurality of first compression springs (10) are respectively located at the inner edges of the plurality of first limiting sleeves (11) and the plurality of second limiting sleeves (12).

4. The swing damper according to claim 1 or 2, characterized in that: The transmission assembly (3) includes a mounting block (16) and a transmission bracket (13) arranged on a lower crossbeam, the transmission bracket (13) is rotatably connected to two first screw rods (14) and two second screw rods (15), the two first screw rods (14) are parallel to each other, the two second screw rods (15) are parallel to each other, the two first screw rods (14) are located between the two second screw rods (15), the extension lines of the two first screw rods (14) are perpendicular to the extension lines of the two second screw rods (15), and the mounting block (16) is slidably connected to A transmission frame (19), a first sliding frame (17) is respectively provided on the nuts of the two first screw rods (14), and a second sliding frame (18) is respectively provided on the nuts of the two second screw rods (15), the transmission frame (19) is simultaneously connected to the two first sliding frames (17) and the two second sliding frames (18), the end of the pendulum frame away from the upper crossbeam (1) is connected to the mounting block (16) by a ball joint, the output end of the ball joint connection is provided with a sliding rod, the mounting block (16) is provided with a sliding hole matching the sliding rod, and the sliding rod is inserted into the sliding hole; The transmission frame (19) includes a first transmission rod (20) and a second transmission rod (21), both ends of the first transmission rod (20) are connected to the two first sliding frames (17) at the same time, and the first transmission rod (20) is slidingly connected to the mounting block (16), and both ends of the second transmission rod (21) are connected to the two second sliding frames (18) at the same time, and the second transmission rod (21) is slidingly connected to the mounting block (16); The frequency increasing unit further comprises a second compression spring (22) sleeved on the outer edge of the first transmission rod (20) and a third compression spring (23) sleeved on the outer edge of the second transmission rod (21).

5. The swing damper according to claim 1 or 2, characterized in that: The transmission assembly (3) includes a mounting block (16) and a transmission bracket (13) arranged on a lower crossbeam, the transmission bracket (13) is rotatably connected to two first screw rods (14) and two second screw rods (15), the two first screw rods (14) are parallel to each other, the two second screw rods (15) are parallel to each other, the two first screw rods (14) are located between the two second screw rods (15), the extension lines of the two first screw rods (14) are perpendicular to the extension lines of the two second screw rods (15), and the mounting block (16) is slidably connected to A transmission frame (19), a first sliding frame (17) is respectively provided on the nuts of the two first screw rods (14), and a second sliding frame (18) is respectively provided on the nuts of the two second screw rods (15), the transmission frame (19) is simultaneously connected to the two first sliding frames (17) and the two second sliding frames (18), the end of the pendulum frame away from the upper crossbeam (1) is connected to the mounting block (16) by a ball joint, the output end of the ball joint connection is provided with a sliding rod, the mounting block (16) is provided with a sliding hole matching the sliding rod, and the sliding rod is inserted into the sliding hole; The frequency increasing unit further comprises two reducers (24) respectively arranged at one end of the first screw rod (14); the output end of the reducer (24) is key-connected with a coil spring shaft (25); the outer edge of the coil spring shaft (25) is sleeved with a coil spring barrel (26); the coil spring shaft (25) and the coil spring barrel (26) are connected via a first coil spring (27); the end of the coil spring barrel (26) away from the reducer (24) is provided with a flywheel barrel (28); the end of the coil spring shaft (25) away from the reducer (24) is key-connected with a flywheel shaft (29); the outer edge of the flywheel shaft (29) is sleeved with a plurality of flywheel pieces (30); the plurality of flywheel pieces (30) are integrally located on the inner edge of the flywheel barrel (28).

6. The swing damper according to claim 5, characterized in that: A second coil spring (31) is provided between the coil spring shaft (25) and the coil spring barrel (26), and the second coil spring (31) is located between the first coil spring (27) and a plurality of flywheels (30).

7. The swing damper according to claim 6, characterized in that: The outer edge of the coil spring shaft (25) is sleeved with a cushion block (32), and the cushion block (32) is located between the first coil spring (27) and the second coil spring (31).

8. The swing damper according to claim 5, characterized in that: The outer edge of the coil spring shaft (25) is sleeved with a bearing (33), the inner wall of the coil spring cylinder (26) is provided with a retaining ring groove (34), an elastic retaining ring (35) matching the retaining ring groove (34) is provided in the retaining ring groove (34), and the bearing (33) is located between the elastic retaining ring (35) and the first coil spring (27).

9. The swing damper according to claim 8, characterized in that: The outer edge of the coil spring shaft (25) is sequentially sleeved with a retaining ring (36), a locking washer (5) and a locking nut (6); the retaining ring (36) contacts the bearing (33) at one end facing the first coil spring (27); and the locking washer (5) is pressed between the retaining ring (36) and the locking nut (6).

10. The swing damper according to claim 1, characterized in that: The transmission assembly (3) includes a mounting block (16) and a transmission bracket (13) arranged on a lower crossbeam, the transmission bracket (13) is rotatably connected to two first screw rods (14) and two second screw rods (15), the two first screw rods (14) are parallel to each other, the two second screw rods (15) are parallel to each other, the two first screw rods (14) are located between the two second screw rods (15), the extension lines of the two first screw rods (14) are perpendicular to the extension lines of the two second screw rods (15), and the mounting block (16) is slidably connected to A transmission frame (19), a first sliding frame (17) is respectively provided on the nuts of the two first screw rods (14), and a second sliding frame (18) is respectively provided on the nuts of the two second screw rods (15), the transmission frame (19) is simultaneously connected to the two first sliding frames (17) and the two second sliding frames (18), the end of the pendulum frame away from the upper crossbeam (1) is connected to the mounting block (16) by a ball joint, the output end of the ball joint connection is provided with a sliding rod, the mounting block (16) is provided with a sliding hole matching the sliding rod, and the sliding rod is inserted into the sliding hole; The transmission frame (19) includes a first transmission rod (20) and a second transmission rod (21), both ends of the first transmission rod (20) are connected to the two first sliding frames (17) at the same time, and the first transmission rod (20) is slidingly connected to the mounting block (16), and both ends of the second transmission rod (21) are connected to the two second sliding frames (18) at the same time, and the second transmission rod (21) is slidingly connected to the mounting block (16); The frequency increasing unit further comprises a second compression spring (22) sleeved on the outer edge of the first transmission rod (20) and a third compression spring (23) sleeved on the outer edge of the second transmission rod (21); The frequency increasing unit further comprises two reducers (24) respectively arranged at one end of the first screw rod (14); the output end of the reducer (24) is key-connected with a coil spring shaft (25); the outer edge of the coil spring shaft (25) is sleeved with a coil spring barrel (26); the coil spring shaft (25) and the coil spring barrel (26) are connected via a first coil spring (27); the end of the coil spring barrel (26) away from the reducer (24) is provided with a flywheel barrel (28); the end of the coil spring shaft (25) away from the reducer (24) is key-connected with a flywheel shaft (29); the outer edge of the flywheel shaft (29) is sleeved with a plurality of flywheel pieces (30); the plurality of flywheel pieces (30) are integrally located on the inner edge of the flywheel barrel (28).

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