Low-frequency pipeline vibration damping device and mounting method

Abstract

The low-frequency pipeline vibration buffering device comprises a supporting frame, the top of the supporting frame is in bolted connection with positive stiffness springs, the other ends of the four positive stiffness springs are in bolted connection with an upper wrapping steel sheet, the wrapping steel sheet is further in bolted connection with a lower wrapping steel sheet, a plurality of fixing rods are fixedly connected to the bottom of the supporting frame, and the other ends of the fixing rods point to the center of the bottom of the supporting frame. A first connecting disc is arranged above the fixing rod, the top of the first connecting disc is fixedly connected with the lower wrapping steel sheet, and an installation method of the device comprises the steps that the size of the supporting frame is determined; installing an upper wrapping steel sheet and a lower wrapping steel sheet; a supporting frame is installed, and a stiffness spring is installed; mounting a fixing rod, a sliding block and a rail groove, wherein a mounting connecting rod is fixedly connected with the first connecting disc and the sliding block; mounting an L-shaped force arm; and mounting a chain and a coil simultaneously. When the device is subjected to small vibration amplitude, mechanical energy is converted into electric energy; when a large vibration amplitude is received, one part of energy is consumed by the spring, and the other part of energy is converted into electric energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-frequency vibration isolation, and relates to a low-frequency pipeline vibration damping device, and also relates to an installation method of the low-frequency pipeline vibration damping device. Background Art

[0002] In many industrial fields such as petrochemical, electric power, heat supply and water supply, the pipeline system, as a key infrastructure for material transportation and energy transfer, often faces complex vibration excitation sources during operation. Taking the petrochemical industry as an example, the unstable flow of fluids in pipelines, including sudden changes in flow velocity, fluid pulsation, etc., and the mechanical coupling effects with connected equipment such as pumps and compressors, are extremely likely to cause pipeline vibrations. Similarly, in the heat supply system, the periodic transportation of hot water and operations such as flow regulation will also cause the pipeline to vibrate to varying degrees. With the continuous development of modern industry towards large-scale and refined directions, the working conditions of the pipeline system are becoming more complex, and the harm of low-frequency vibration is becoming more prominent. Strong pipeline vibrations may lead to a series of serious consequences, such as pipeline fatigue damage, leakage at pipeline joints, loosening of supports, and even pipeline rupture. These not only seriously affect the normal service life of the pipeline, but may further lead to major safety accidents such as environmental pollution, fire, and explosion, bringing huge economic losses and social impacts to enterprises.

[0003] Under this background, there is an urgent need for a new technical means that can efficiently, reliably and economically solve the problem of low-frequency pipeline vibration. The continuous development of energy conversion technology and quasi-zero stiffness technology provides new ideas and possibilities for solving this problem. Energy conversion technology can convert mechanical energy, thermal energy, light energy, etc. into electrical energy. Among them, energy harvesting devices based on principles such as piezoelectric materials and electromagnetic induction have broad application prospects in vibration energy conversion. The quasi-zero stiffness vibration isolation technology adjusts parameters such as the stiffness and damping of the system by designing a special vibration isolation system, so that the system exhibits an approximately zero stiffness characteristic at a specific frequency, thereby significantly reducing the natural frequency of the system and achieving effective isolation of low-frequency vibrations.

[0004] Based on the urgent need for low-frequency vibration treatment of industrial pipelines and the development basis of energy conversion and quasi-zero stiffness related theories and technologies, the collaborative application of energy conversion and quasi-zero stiffness in the field of pipeline vibration reduction has become a highly potential research direction, and is expected to provide a more efficient and reliable solution for the problem of low-frequency vibration of industrial pipelines. Summary of the Invention

[0005] The object of the present invention is to provide a low-frequency pipeline vibration damping device, which solves the problem of pipeline rupture caused by low-frequency vibration in the prior art.

[0006] The first technical solution adopted by the present invention is a low-frequency pipeline vibration damping device, which includes a support frame. The support frame is a cubic frame. At the four corners of the top of the support frame, positive stiffness springs are respectively bolted. The other ends of the four positive stiffness springs are bolted to an upper wrapping steel sheet, and the upper wrapping steel sheet is also bolted to a lower wrapping steel sheet. On one set of opposite sides of the bottom of the support frame, a number of fixing rods are fixedly connected. The other ends of the number of fixing rods point to the center of the bottom of the support frame. Above the number of fixing rods, a first connecting plate is arranged. The top of the first connecting plate is fixedly connected to the lower wrapping steel sheet.

[0007] The characteristics of the present invention are as follows: Plastic layers are both adhered to the inner surfaces of the upper wrapping steel sheet and the lower wrapping steel sheet.

[0008] At the middle position of the support frame along the direction perpendicular to the ground, a first cross beam and a second cross beam are fixedly connected. The first cross beam and the second cross beam are arranged at intervals. A number of track grooves are fixedly connected to the first cross beam. In each of the number of track grooves, a first spring is arranged. Each first spring is fixedly connected to the first cross beam. The other end of each first spring is fixedly connected to a slider. Each slider is also hinged to a connecting rod. The other ends of the number of connecting rods far from the sliders are fixedly connected to the first connecting plate.

[0009] At the end of each track groove far from the first cross beam, a first support rod is welded. The first support rod is perpendicular to the corresponding track groove. The other end of the first support rod is fixedly connected to the fixing rod.

[0010] L-shaped force arms are fixedly connected to both of the two second cross beams. At the end of the L-shaped force arm far from the second cross beam, a second connecting rod is fixedly connected. A small gear is rotatably connected to the second connecting rod. At the corner of the L-shaped force arm, a first connecting rod is fixedly connected. A large gear is rotatably connected to the first connecting rod. The small gear and the large gear are meshed with each other.

[0011] On the frames of the top of the support frame corresponding to the two second cross beams, second springs are fixed by bolts. The other end of the second spring is fixedly connected to a chain. The end of the chain far from the second spring is fixedly connected to a third connecting rod. The third connecting rod is fixedly connected to the bottom of the lower wrapping steel sheet. The chain hole is meshed with the outer peripheral gear at the bottom of the large gear.

[0012] The small gear is rigidly connected to a linkage rod. On the side of the linkage rod far from the small gear, a second connecting plate is rigidly connected. On the side of the second connecting plate far from the linkage rod, a permanent magnet is fixedly connected.

[0013] The permanent magnet is of a hollow structure. At the central position inside the permanent magnet, a hollow cylinder is fixedly connected. A coil is wound around the outer periphery of the hollow cylinder. At the central position inside the hollow cylinder, a fourth connecting rod is fixedly connected. A second support rod is also fixedly connected to the bottom of the support frame. The end of the second support rod far from the bottom of the support frame is fixedly connected to the fourth connecting rod.

[0014] The material of the hollow cylinder is plastic.

[0015] The second technical solution adopted by the present invention is an installation method for a low-frequency pipeline vibration damping device, which specifically includes the following steps: Step 1: Determine the size of the support frame according to the pipeline diameter; Step 2: Install the upper wrapping steel sheet and the lower wrapping steel sheet so that they are closely attached to the pipeline; Step 3: Install the support frame and fixedly install four positive stiffness springs; Step 4: Install the fixing rod, the first support rod, the slider, the first spring, and the track groove, and install the connecting rod to fixedly connect the first connecting disk and the slider; Step 5: Install the L-shaped force arm, and install the small gear and the large gear; Step 6: Install the chain, and at the same time install the permanent magnet, the hollow cylinder, and the coil.

[0016] The beneficial effects of the present invention are as follows: For the low-frequency pipeline vibration damping device of the present invention, when the pipeline conveys materials and generates vibrations, the upper wrapping steel sheet and the lower wrapping steel sheet will generate vertical displacements, driving the chain to move. As a result, the large gear engaged with the chain starts to move, and the small gear engaged with the large gear starts to move successively. The small gear drives the permanent magnet to rotate, generating an induced current with the fixed coil. The large gear drives the small gear to move, and the rotational speed will increase, enabling efficient power generation. When the vibration amplitude received by the device is within a certain range, its restoring force hardly changes with the displacement, and the curve of the relationship between force and displacement is approximately a horizontal straight line, converting the generated mechanical energy into electrical energy. When the vibration amplitude exceeds a certain range, the entire device starts to function simultaneously. Part of the energy is consumed by the spring, and part of it is converted into electrical energy.

[0017] The low-frequency pipeline vibration damping device of the present invention utilizes the quasi-zero stiffness characteristic and, through a reasonable structural design, makes its stiffness approximately zero near the equilibrium position, which can effectively reduce the natural frequency of the system, thereby better adapting to the frequency of low-frequency vibrations. Compared with traditional vibration damping devices, it has a more excellent ability to suppress low-frequency vibrations, can significantly reduce the vibration amplitude of the pipeline in the low-frequency band, and effectively solve the thorny problem of low-frequency vibrations in the operation of industrial pipelines.

[0018] The low-frequency pipeline vibration damping device of the present invention, by means of an energy conversion mechanism, converts the vibration mechanical energy into electrical energy, effectively converting and dissipating the energy during the pipeline vibration process. This not only reduces the impact of vibrations on the pipeline and surrounding facilities but also enables the reasonable utilization or storage of the converted energy, improving the overall efficiency of energy utilization and avoiding the continuous accumulation of vibration energy in the pipeline system. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the low-frequency pipeline vibration damping device of the present invention; Figure 2It is a schematic structural diagram of the plastic layer of the low-frequency pipeline vibration damping device of the present invention; Figure 3 It is a schematic structural diagram of the track groove of the low-frequency pipeline vibration damping device of the present invention; Figure 4 It is a schematic structural diagram of the L-shaped force arm of the low-frequency pipeline vibration damping device of the present invention; Figure 5 It is a schematic structural diagram of the permanent magnet of the low-frequency pipeline vibration damping device of the present invention.

[0020] In the figure, 1. Support frame; 2. Upper wrapping steel sheet; 3. Lower wrapping steel sheet; 4. First connection plate; 5. Link rod; 6. Slide block; 7. First spring; 8. Positive stiffness spring; 9. Second spring; 10. Chain; 11. Large gear; 12. Small gear; 13. Permanent magnet; 14. Second connection plate; 15. Linking rod; 16. L-shaped force arm; 17. First connecting rod; 18. Second connecting rod; 19. First support rod; 20. Second support rod; 21. Coil; 22. Track groove; 23. Fixed rod; 24. Third connecting rod; 25. Hollow cylinder; 26. Plastic layer; 27. Fourth connecting rod; 28. First cross beam; 29. Second cross beam. Detailed implementation mode

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation modes.

[0022] The low-frequency pipeline vibration damping device, as Figure 1 shown, includes a support frame 1. The support frame 1 is a cubic frame. At the four corners of the top of the support frame 1, positive stiffness springs 8 are respectively bolted. The other ends of the four positive stiffness springs 8 are bolted to an upper wrapping steel sheet 2. The upper wrapping steel sheet 2 is also bolted to a lower wrapping steel sheet 3. On one set of opposite sides at the bottom of the support frame 1, a plurality of fixed rods 23 are fixedly connected. The other ends of the plurality of fixed rods 23 point to the center of the bottom of the support frame 1. Above the plurality of fixed rods 23, a first connection plate 4 is arranged. The top of the first connection plate 4 is fixedly connected to the lower wrapping steel sheet 3. As Figure 2 shown, the inner surfaces of the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3 are both provided with a plastic layer 26.

[0023] As Figure 1 shown, at the middle position of the support frame 1 along the direction perpendicular to the ground, a first cross beam 28 and a second cross beam 29 are fixedly connected. The first cross beam 28 and the second cross beam 29 are arranged at intervals. As Figure 3As shown, several track grooves 22 are fixedly connected to the first crossbeam 28. A first spring 7 is provided in each of the several track grooves 22. Each first spring 7 is fixedly connected to the first crossbeam 28, and the other end of each first spring 7 is fixedly connected to a slider 6. Each slider 6 is also hinged with a connecting rod 5. One end of the several connecting rods 5 away from the slider 6 is fixedly connected to the first connection disk 4. One end of each track groove 22 away from the first crossbeam 28 is welded with a first support rod 19. The first support rod 19 is perpendicular to the corresponding track groove 22, and the other end of the first support rod 19 is fixedly connected to the fixed rod 23.

[0024] As Figure 4 shown, L-shaped force arms 16 are fixedly connected to both of the two second crossbeams 29. One end of the L-shaped force arm 16 away from the second crossbeam 29 is fixedly connected to a second connecting rod 18. A small gear 12 is rotatably connected to the second connecting rod 18. A first connecting rod 17 is fixedly connected to the corner of the L-shaped force arm 16. A large gear 11 is rotatably connected to the first connecting rod 17. The small gear 12 and the large gear 11 are meshed with each other. The first connecting rod 17 provides support and positioning for the large gear 11 to ensure the stable operation of the large gear 11 at a predetermined position.

[0025] As Figure 1 shown, a second spring 9 is fixed to the frames corresponding to the two second crossbeams 29 at the top of the support frame 1 by bolts. As Figure 4 shown, the other end of the second spring 9 is fixedly connected to a chain 10. One end of the chain 10 away from the second spring 9 is fixedly connected to a third connecting rod 24. The third connecting rod 24 is fixedly connected to the bottom of the lower wrapping steel sheet 3. The holes of the chain 10 are meshed with the outer peripheral gears at the bottom of the large gear 11.

[0026] As Figure 5 shown, a linkage rod 15 is rigidly connected to the small gear 12. A second connection disk 14 is rigidly connected to one side of the linkage rod 15 away from the small gear 12. A permanent magnet 13 is fixedly connected to one side of the second connection disk 14 away from the linkage rod 15.

[0027] The permanent magnet 13 is of a hollow structure. A hollow cylinder 25 is fixedly connected to the central position inside the permanent magnet 13. A coil 21 is wound around the outer periphery of the hollow cylinder 25. A fourth connecting rod 27 is fixedly connected to the center inside the hollow cylinder 25. A second support rod 20 is also fixedly connected to the bottom of the support frame 1. One end of the second support rod 20 away from the bottom of the support frame 1 is fixedly connected to the fourth connecting rod 27. The material of the hollow cylinder 25 is plastic.

[0028] The installation method of the low-frequency pipeline vibration damping device specifically includes the following steps: Step 1, determine the size of the support frame 1 according to the pipeline diameter; Step 2, install the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3 so that they are closely attached to the pipeline; Step 3, install the support frame 1 and fixedly install four positive stiffness springs 8; Step 4: Install the fixing rod 23, the first support rod 19, the slider 6, the first spring 7, and the track groove 22, and install the connecting rod 5 to fixedly connect the first connection disk 4 and the slider 6; Step 5: Install the L-shaped force arm 16, and install the pinion 12 and the large gear 11; Step 6: Install the chain 10, and at the same time install the permanent magnet 13, the hollow cylinder 25, and the coil 21.

[0029] Embodiment 1 Low-frequency pipeline vibration damping device, as Figure 1 shown, includes a support frame 1. The support frame 1 is a cubic frame. Four corners of the top of the support frame 1 are respectively bolted with positive stiffness springs 8. The other ends of the four positive stiffness springs 8 are bolted with an upper wrapping steel sheet 2. The upper wrapping steel sheet 2 is also bolted with a lower wrapping steel sheet 3. A plurality of fixing rods 23 are fixedly connected to one set of opposite sides at the bottom of the support frame 1. The other ends of the plurality of fixing rods 23 point to the center of the bottom of the support frame 1. A first connection disk 4 is arranged above the plurality of fixing rods 23. The top of the first connection disk 4 is fixedly connected to the lower wrapping steel sheet 3. As Figure 2 shown, plastic layers 26 are conformally coated on the inner surfaces of the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3.

[0030] Embodiment 2 Based on the low-frequency pipeline vibration damping device provided in Embodiment 1, the low-frequency pipeline vibration damping device provided in this embodiment, as Figure 1 shown, a first cross beam 28 and a second cross beam 29 are fixedly connected to the middle position of the support frame 1 along the direction perpendicular to the ground. The first cross beam 28 and the second cross beam 29 are arranged at intervals. As Figure 3 shown, a plurality of track grooves 22 are fixedly connected to the first cross beam 28. A first spring 7 is arranged in each of the plurality of track grooves 22. Each first spring 7 is fixedly connected to the first cross beam 28. The other end of each first spring 7 is fixedly connected to a slider 6. Each slider 6 is also hinged with a connecting rod 5. The other ends of the plurality of connecting rods 5 away from the sliders 6 are fixedly connected to the first connection disk 4. A first support rod 19 is welded to one end of each track groove 22 away from the first cross beam 28. The first support rod 19 is perpendicular to the corresponding track groove 22. The other end of the first support rod 19 is fixedly connected to the fixing rod 23.

[0031] Embodiment 3 Based on the low-frequency pipeline vibration damping device provided in Embodiment 2, the low-frequency pipeline vibration damping device provided in this embodiment, as Figure 4As shown in the figure, L-shaped force arms 16 are fixedly connected to both of the two second cross beams 29. A second connecting rod 18 is fixedly connected to one end of the L-shaped force arm 16 far away from the second cross beam 29. A small gear 12 is rotatably connected to the second connecting rod 18. A first connecting rod 17 is fixedly connected to the corner of the L-shaped force arm 16. A large gear 11 is rotatably connected to the first connecting rod 17. The small gear 12 and the large gear 11 are meshed with each other. The first connecting rod 17 provides support and positioning for the large gear 11, ensuring the stable operation of the large gear 11 at a predetermined position.

[0032] Embodiment 4 On the basis of the low-frequency pipeline vibration damping device provided in Embodiment 3, the low-frequency pipeline vibration damping device provided in this embodiment is as Figure 1 shown. A second spring 9 is fixed to the frame corresponding to the two second cross beams 29 at the top of the support frame 1 by bolts. As Figure 4 shown, the other end of the second spring 9 is fixedly connected to a chain 10. One end of the chain 10 far away from the second spring 9 is fixedly connected to a third connecting rod 24. The third connecting rod 24 is fixedly connected to the bottom of the lower wrapping steel sheet 3. The holes of the chain 10 are meshed with the outer peripheral gears at the bottom of the large gear 11.

[0033] Embodiment 5 On the basis of the low-frequency pipeline vibration damping device provided in Embodiment 4, the low-frequency pipeline vibration damping device provided in this embodiment is as Figure 5 shown. The small gear 12 is rigidly connected to a linkage rod 15. A second connection disk 14 is rigidly connected to one side of the linkage rod 15 far away from the small gear 12. A permanent magnet 13 is fixedly connected to one side of the second connection disk 14 far away from the linkage rod 15.

[0034] The permanent magnet 13 is of a hollow structure. A hollow cylinder 25 is fixedly connected to the central position inside the permanent magnet 13. A coil 21 is wound around the outer periphery of the hollow cylinder 25. A fourth connecting rod 27 is fixedly connected to the central position inside the hollow cylinder 25. A second support rod 20 is also fixedly connected to the bottom of the support frame 1. One end of the second support rod 20 far away from the bottom of the support frame 1 is fixedly connected to the fourth connecting rod 27. The material of the hollow cylinder 25 is plastic.

[0035] For the low-frequency pipeline vibration damping device provided in this embodiment, when the pipeline conveys materials and generates vibrations, the upper wrapping steel sheet and the lower wrapping steel sheet will generate vertical displacements, driving the chain to move. Then, the large gear engaged with the chain starts to move, and the small gear engaged with the large gear starts to move successively. The small gear drives the permanent magnet to rotate, generating an induced current with the fixed coil. The large gear drives the small gear to move, and the rotational speed will increase, enabling efficient power generation. When the vibration amplitude received by the device is within a certain range, its restoring force hardly changes with the displacement, and the relationship curve between the force and the displacement is approximately a horizontal straight line, and the generated mechanical energy is converted into electrical energy. When the vibration amplitude exceeds a certain range, the entire device starts to act simultaneously. Part of the energy is consumed by the spring, and part of it is converted into electrical energy.

[0036] Example 6 Based on the low-frequency pipeline vibration damping device provided in Example 5, the installation method of the low-frequency pipeline vibration damping device provided in this example specifically includes the following steps: Step 1: Determine the size of the support frame 1 according to the pipeline diameter; Step 2: Install the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3 so that they are in close contact with the pipeline; through the bolt holes on the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3, connect the upper wrapping steel sheet 2 and the lower wrapping steel sheet 3 together with bolts, and tighten the two bolts to ensure that the upper wrapping steel sheet 2, the lower wrapping steel sheet 3 and the pipeline wall are in close contact; Step 3: Install the support frame 1 and fixedly install four positive stiffness springs 8; Step 4: Install the fixing rod 23, the first support rod 19, the slider 6, the first spring 7 and the track groove 22, and install the connecting rod 5 to fixedly connect the first connection disk 4 and the slider 6; one end of the connecting rod 5 is fixedly connected to the first connection disk 4, the first connection disk 4 is fixedly connected to the lower wrapping steel sheet 3, after the other end of the connecting rod 5 is connected to the slider 6, put the slider 6 and the first spring 7 into the track groove 22 on the support frame, and ensure that the connecting rod 5 makes a certain angle with the horizontal line; Step 5: Install the L-shaped force arm 16, and install the small gear 12 and the large gear 11; Step 6: Install the chain 10, and at the same time install the permanent magnet 13, the hollow cylinder 25 and the coil 21.

[0037] After the installation is completed, it should be ensured that all accessories are installed in place, confirm whether the low-frequency pipeline vibration damping device is firmly installed, and whether each component is working properly. After the low-frequency pipeline vibration damping device works normally, start the conveying pipeline system and perform daily maintenance, regularly check the working state of the low-frequency pipeline vibration damping device to ensure its normal operation and timely repair or replace damaged components.

Claims

1. Low-frequency pipeline vibration damping device, characterized in that: The invention comprises a support frame (1), wherein the support frame (1) is a cubic frame, wherein four corners of the top of the support frame (1) are respectively bolted to positive stiffness springs (8), the other ends of the four positive stiffness springs (8) are bolted to an upper wrapping steel sheet (2), and the upper wrapping steel sheet (2) is also bolted to a lower wrapping steel sheet (3), and a plurality of fixing rods (23) are fixedly connected to one group of opposite sides of the bottom of the support frame (1), the other ends of the plurality of fixing rods (23) point to the center of the bottom of the support frame (1), and a first connecting plate (4) is arranged above the plurality of fixing rods (23), and the top of the first connecting plate (4) is fixedly connected to the lower wrapping steel sheet (3).

2. The low-frequency pipeline vibration damping device according to claim 1 is characterized in that: The inner surfaces of the upper wrapping steel sheet (2) and the lower wrapping steel sheet (3) are both provided with a plastic layer (26).

3. The low-frequency pipeline vibration damping device according to claim 1, characterized in that: A first crossbeam (28) and a second crossbeam (29) are fixedly connected to the support frame (1) at a middle position in a direction perpendicular to the ground. The first crossbeam (28) and the second crossbeam (29) are arranged at intervals. A plurality of track grooves (22) are fixedly connected to the first crossbeam (28). First springs (7) are arranged in the plurality of track grooves (22). Each of the first springs (7) is fixedly connected to the first crossbeam (28). A slider (6) is fixedly connected to the other end of each of the first springs (7). Each of the sliders (6) is also hingedly connected to a connecting rod (5). The ends of the plurality of connecting rods (5) away from the sliders (6) are fixedly connected to the first connecting plate (4).

4. The low-frequency pipeline vibration damping device according to claim 3 is characterized in that: A first support rod (19) is welded to one end of each track groove (22) away from the first crossbeam (28); the first support rod (19) is perpendicular to the corresponding track groove (22); and the other end of the first support rod (19) is fixedly connected to a fixing rod (23).

5. The low-frequency pipeline vibration damping device according to claim 3 is characterized in that: Both of the second cross beams (29) are fixedly connected with an L-shaped force arm (16); one end of the L-shaped force arm (16) away from the second cross beam (29) is fixedly connected with a second connecting rod (18); a small gear (12) is rotatably connected to the second connecting rod (18); a first connecting rod (17) is fixedly connected at a corner of the L-shaped force arm (16); a large gear (11) is rotatably connected to the first connecting rod (17); and the small gear (12) and the large gear (11) are meshed.

6. The low-frequency pipeline vibration damping device according to claim 5, characterized in that: A second spring (9) is fixed to the top of the support frame (1) and the frame corresponding to the two second cross beams (29) by bolts, the other end of the second spring (9) is fixedly connected to a chain (10), the end of the chain (10) away from the second spring (9) is fixedly connected to a third connecting rod (24), the third connecting rod (24) is fixedly connected to the bottom of the lower wrapping steel sheet (3), and the hole of the chain (10) is meshed with the outer peripheral gear at the bottom of the large gear (11).

7. The low-frequency pipeline vibration damping device according to claim 5, characterized in that: The pinion (12) is rigidly connected to a linkage rod (15), a side of the linkage rod (15) away from the pinion (12) is rigidly connected to a second connection disk (14), and a side of the second connection disk (14) away from the linkage rod (15) is fixedly connected to a permanent magnet (13).

8. The low-frequency pipeline vibration damping device according to claim 7, characterized in that: The permanent magnet (13) is a hollow structure, a hollow cylinder (25) is fixedly connected to the center of the permanent magnet (13), a coil (21) is wound around the outer circumference of the hollow cylinder (25), a fourth connecting rod (27) is fixedly connected to the center of the hollow cylinder (25), a second supporting rod (20) is also fixedly connected to the bottom of the supporting frame (1), and one end of the second supporting rod (20) away from the bottom of the supporting frame (1) is fixedly connected to the fourth connecting rod (27).

9. The low-frequency pipeline vibration damping device according to claim 8, characterized in that: The hollow cylinder (25) is made of plastic.

10. The installation method of the low-frequency pipeline vibration damping device is characterized in that: The method for installing the low-frequency pipeline vibration damping device according to any one of claims 1 to 9 specifically comprises the following steps: Step 1, determining the size of the support frame (1) according to the diameter of the pipeline; Step 2, installing the upper wrapping steel sheet (2) and the lower wrapping steel sheet (3) so that they fit tightly against the pipeline; Step 3, installing the support frame (1) and fixing four positive stiffness springs (8); Step 4, installing the fixing rod (23), the first supporting rod (19), the sliding block (6), the first spring (7) and the track groove (22); installing the connecting rod (5) to fix the first connecting plate (4) and the sliding block (6); Step 5, install the L-shaped arm (16), and install the small gear (12) and the large gear (11); Step 6, installing the chain (10), and at the same time installing the permanent magnet (13), the hollow cylinder (25) and the coil (21).

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