Horizontal multidirectional low-frequency tuned liquid mass damper

Abstract

The invention relates to the technical field of vibration reduction, in particular to a horizontal multidirectional low-frequency tuned liquid mass damper. The horizontal multidirectional low-frequency tuned liquid mass damper comprises a damping liquid container, a mass block and a plurality of obliquely arranged springs. The damping liquid container is used for containing damping liquid and is connected with a structure to be subjected to vibration reduction; the mass block is arranged in the damping fluid container, and a plurality of rolling pieces are arranged at the bottom of the mass block; the springs are obliquely arranged at intervals in the circumferential direction of the mass block, one ends of the springs are connected with the mass block, the other ends of the springs are connected with the inner wall of the damping fluid container, and the connecting ends of the springs and the inner wall of the damping fluid container are higher than the connecting ends of the springs and the mass block. The problems that in the prior art, a spring mass block system TMD is difficult to design for an ultralow-frequency spring, and the elastic force of the spring cannot overcome the friction force of the bottom of the mass block can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction, and in particular to a horizontal multi-directional low-frequency tuning liquid mass damper. Background Art

[0002] In recent years, with the use of high-strength and lightweight materials, the emergence of new processes and the improvement of construction technology, engineering structures have become increasingly lighter, with the characteristics of low damping and low natural frequency becoming increasingly obvious. In particular, large-span cable-stayed bridges with large cantilevers, 10MW-class offshore wind turbine towers and high-rise vibration reduction are prone to horizontal multi-directional low-frequency vibrations under external loads, which seriously affect the service life and performance of the engineering results. Vibration control has become an important issue.

[0003] Single pendulum TMD control frequency Where g is the acceleration of gravity, l is the pendulum length, and the relationship is shown in Table 1. It can be seen that when the control frequency of the single pendulum TMD is as low as 0.1 Hz, the pendulum length will reach 24.82 m, which seriously affects the stability and installation space of the TMD structure. In addition, the applicable angle range of the control frequency is ±5°, which is difficult to meet the design requirements for a large stroke TMD, and the TMD needs to be equipped with a special damper to dissipate energy.

[0004] The control direction of the spring-mass block system TMD is single, and it is difficult to design an ultra-low frequency spring, and the spring elastic force cannot overcome the friction force at the bottom of the mass block. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a horizontal multi-directional low-frequency tuned liquid mass damper, which can solve the problem of the spring mass block system TMD in the prior art, that the ultra-low frequency spring is difficult to design, and the spring elastic force cannot overcome the friction force at the bottom of the mass block.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] In one aspect, the present invention provides a horizontal multi-directional low frequency tuned liquid mass damper, comprising:

[0008] A damping liquid container, which is used to contain the damping liquid and is connected to the structure to be damped;

[0009] A mass block is disposed in the damping liquid container, and a plurality of rolling elements are disposed at the bottom of the mass block;

[0010] A plurality of springs are arranged at intervals along the circumference of the mass block, wherein the springs are arranged obliquely, one end of the springs is connected to the mass block, and the other end of the springs is connected to the inner wall of the damping fluid container, and the connection end of the springs to the inner wall of the damping fluid container is higher than the connection end to the mass block.

[0011] In some optional schemes, the inclination angles of the multiple springs are the same, and the connecting ends of the springs and the inner wall of the damping fluid container are arranged through a height adjustment mechanism, and the height adjustment mechanism is used to adjust the height of the connecting ends of the springs and the inner wall of the damping fluid container.

[0012] In some optional solutions, the height adjustment mechanism includes:

[0013] A lifting bracket, which is disposed in the damping fluid container and can move vertically in the damping fluid container, and is used to connect the connecting end of the spring connected to the inner wall of the damping fluid container;

[0014] A driving member is connected to the lifting bracket and is used to drive the lifting bracket to move up and down.

[0015] In some optional schemes, the driving member includes: a support frame, a driving motor and a screw rod, the support frame is arranged on the top of the damping fluid container, the driving motor is arranged above the support frame, the screw rod is vertically arranged and connected to the output end of the driving motor, and a screw rod sleeve is provided on the screw rod; the lifting bracket includes a plurality of connecting rods corresponding to the spring, one end of the connecting rod is connected to the screw rod sleeve, and the other end is used to connect to the spring.

[0016] In some optional schemes, a limiting groove corresponding to the connecting rod is provided on the inner wall of the damping fluid container, and the end of the connecting rod connected to the spring extends into the limiting groove and moves vertically in the limiting groove.

[0017] In some optional solutions, the connecting rod is connected to the spring via a vertical connecting rod arranged below the connecting rod.

[0018] In some optional schemes, it also includes a vibration monitoring mechanism and a control unit, the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be attenuated, the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the driving member to adjust the height of the lifting bracket according to the vibration frequency.

[0019] In some optional schemes, the mass block includes a mass block container and counterweight iron sand filled in the mass block container, and the spring is connected to the middle part of the mass block container.

[0020] In some optional solutions, the cross-section of the mass block container is circular, and the diameter of the middle part of the mass block container is smaller than the diameters of the upper and lower ends.

[0021] In some optional schemes, the rolling element is a rolling ball or a universal bull's eye wheel.

[0022] Compared with the prior art, the advantages of the present invention are: in this scheme, due to the inclined setting of the spring, an upward component of force can be provided for the mass block, and the damping fluid can also provide buoyancy to the mass block. Since the vertical buoyancy and the vertical component of the spring balance the dead weight, the contact pressure of the mass block on the bottom of the damping fluid container is reduced, which can effectively reduce the frictional resistance at the bottom of the mass block, so that when the structure to be damped vibrates, it is no longer difficult to start, thereby effectively playing a vibration reduction role. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 Schematic diagram of the structure of a horizontal multi-directional low-frequency tuned liquid mass damper in an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the main structure of the frequency adjustable mass damper in an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the top view of the frequency adjustable mass damper in an embodiment of the present invention.

[0027] In the figure: 1. damping liquid container; 11. barrel; 12. mounting plate; 2. mass block; 21. mass block container; 22. counterweight iron sand; 3. rolling element; 4. spring; 5. height adjustment mechanism; 51. lifting bracket; 511. connecting rod; 512. vertical connecting rod; 52. driving element; 521. supporting frame; 522. driving motor; 523. screw rod; 524. screw rod sleeve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0030] like Figure 1As shown, on the one hand, the present invention provides a horizontal multi-directional low-frequency tuned liquid mass damper, comprising: a damping liquid container 1, a mass block 2 and a plurality of inclined springs 4. The damping liquid container 1 is used to contain the damping liquid and is connected to the structure to be damped; the mass block 2 is arranged in the damping liquid container 1, and a plurality of rolling members 3 are arranged at the bottom of the mass block 2; a plurality of springs 4 are arranged at intervals along the circumference of the mass block 2, and the springs 4 are arranged obliquely, one end of which is connected to the mass block 2, and the other end of which is connected to the inner wall of the damping liquid container 1, and the connection end of the spring 4 to the inner wall of the damping liquid container 1 is higher than the connection end to the mass block 2.

[0031] When using the horizontal multi-directional low-frequency tuned liquid mass damper, the damping liquid container 1 is installed on the structure to be damped, and the damping liquid is placed in the damping liquid container 1, and the mass block 2 is placed in the damping liquid container 1. A plurality of springs 4 are arranged at intervals along the circumference of the mass block 2, and the connection end of the spring 4 with the inner wall of the damping liquid container 1 is higher than the connection end with the mass block 2, so that the spring 4 is arranged obliquely. Since the spring 4 is arranged obliquely, an upward component force can be provided for the mass block 2, and the damping liquid can also provide buoyancy to the mass block 2. Since the vertical buoyancy and the vertical component force of the spring 4 balance the dead weight, the contact pressure of the mass block 2 on the bottom of the damping liquid container 1 is reduced, and the friction resistance at the bottom of the mass block 2 can be effectively reduced, so that when the structure to be damped vibrates, it is no longer difficult to start, and the vibration reduction effect is effectively played.

[0032] The connection between the spring 4 and the inner wall of the damping fluid container 1 can be a direct connection or an indirect connection through other structures. Here, the spring 4 is connected to the inner wall of the damping fluid container 1, which only means that the end of the spring 4 is located at the inner wall of the damping fluid container 1.

[0033] In this example, the plurality of springs 4 is at least three and is evenly spaced along the circumference of the mass block 2, which can provide a vibration reduction effect in all horizontal directions.

[0034] Specifically, the bottom friction F of mass block 2 is f =μF n , where F f is the rolling friction resistance, μ is the rolling friction coefficient, F n is the bottom pressure of mass block 2, F n =GF 浮 -nF N sinθ=G-ρgV 排 -nF N sinθ, where G is the mass weight, G = mg, m is the total mass weight, and g is the gravitational acceleration; F 浮 is the liquid buoyancy, F 浮 =ρgV 排 , ρ is the liquid density, V 排 is the volume of liquid displaced by the mass block. n is the number of springs, F N为弹簧弹力, F N =kδ, k is the spring stiffness, δ is the spring elongation, and θ is the spring oblique angle.

[0035] The deadweight of the mass block 2 is balanced by the buoyancy of the liquid and the vertical component of the spring, thereby reducing the contact pressure and thus reducing the friction, thereby achieving the movement of the mass block of the low-frequency tuned mass damper.

[0036] like Figure 2 and Figure 3 As shown, in some optional embodiments, the inclination angles of multiple springs 4 are the same, and the connecting ends of the springs 4 and the inner wall of the damping fluid container 1 are arranged through a height adjustment mechanism 5, which is used to adjust the height of the connecting ends of the springs 4 and the inner wall of the damping fluid container 1.

[0037] In this embodiment, the connecting end between the spring 4 and the inner wall of the damping liquid container 1 is arranged through the height adjustment mechanism 5, that is, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 through the height adjustment mechanism 5. By adjusting the height of the connecting end between the spring 4 and the inner wall of the damping liquid container 1 through the height adjustment mechanism 5, the angle and elongation of the spring 4 can be adjusted, which is equivalent to adjusting the friction force at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, so as to achieve the purpose of adjusting the vibration frequency.

[0038] In some optional embodiments, the height adjustment mechanism 5 includes: a lifting bracket 51 and a driving member 52. The lifting bracket 51 is disposed in the damping fluid container 1 and can move vertically in the damping fluid container 1, and is used to connect the connection end of the spring 4 connected to the inner wall of the damping fluid container 1; the driving member 52 is connected to the lifting bracket 51, and is used to drive the lifting bracket 51 to move up and down.

[0039] In this embodiment, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 by means of a lifting bracket 51 disposed in the damping liquid container 1, and the lifting bracket 51 can move vertically in the damping liquid container 1. By driving the lifting bracket 51 up and down by the driving member 52, the height of the connection end between the spring 4 and the lifting bracket 51 can be adjusted, thereby driving the adjustment of the angle and elongation of the spring 4, which is equivalent to adjusting the friction force at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, thereby achieving the purpose of adjusting the vibration frequency.

[0040] In some optional embodiments, the driving member 52 includes: a support frame 521, a driving motor 522 and a screw 523. The support frame 521 is arranged on the top of the damping liquid container 1, the driving motor 522 is arranged above the support frame 521, the screw 523 is vertically arranged and connected to the output end of the driving motor 522, and a screw sleeve 524 is sleeved on the screw 523; the lifting bracket 51 includes a plurality of connecting rods 511 corresponding to the spring 4, one end of the connecting rod 511 is connected to the screw sleeve 524, and the other end is used to connect to the spring 4.

[0041] In this embodiment, a support frame 521 is arranged on the top of the damping liquid container 1, and a driving motor 522 is arranged above the support frame 521, the output end of the driving motor 522 is connected to a vertically arranged screw rod 523, a screw rod sleeve 524 matching with the screw rod 523 is sleeved on the screw rod 523, and the lifting bracket 51 is connected to the screw rod sleeve 524, the driving motor 522 drives the screw rod 523 to rotate, and drives the screw rod sleeve 524 to move vertically on the screw rod 523, which can drive the wire lifting bracket 51 to move vertically, thereby driving the angle and elongation of the adjustment spring 4.

[0042] In some optional embodiments, a limiting groove corresponding to the connecting rod 511 is provided on the inner wall of the damping liquid container 1, and the end of the connecting rod 511 connected to the spring 4 extends into the limiting groove and moves vertically in the limiting groove.

[0043] In this embodiment, in order to prevent this, when the driving motor 522 drives the screw rod 523 to rotate, driving the screw rod sleeve 524 to move vertically on the screw rod 523, the screw rod sleeve 524 rotates, and the end of the connecting rod 511 connected to the screw rod sleeve 524 is clamped in the limiting groove on the inner wall of the damping liquid container 1. In this way, when the driving motor 522 drives the screw rod 523 to rotate, the screw rod sleeve 524 will not rotate, but will only move vertically relative to the screw rod 523, thereby driving the end of the connecting rod 511 connected to the spring 4 to move vertically in the limiting groove to adjust the angle and elongation of the spring 4.

[0044] In some optional embodiments, the connecting rod 511 is connected to the spring 4 via a vertical connecting rod 512 disposed below the connecting rod 511 .

[0045] In this example, in order to achieve the angle adjustment of the spring 4 between 0 degrees and the set angle, a vertical connecting rod 512 is provided at the lower part of the connecting rod 511, and the lower end of the vertical connecting rod 512 is connected to the spring 4. The vertical connecting rod 512 is located on the inner side of the inner wall of the damping liquid container 1 and is arranged vertically. Such a design enables the spring 4 to be in a horizontal state when the connecting rod 511 of the lifting bracket 51 descends to the top of the mass block 2. In addition, in order to ensure the stability of the mass block 2 when the spring 4 pulls the mass block 2, the connection end of the spring 4 and the mass block 2 is located in the middle and lower part of the mass block 2.

[0046] In some optional embodiments, the harmonic liquid mass damper also includes a vibration monitoring mechanism and a control unit, the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped, the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the driving member 52 to adjust the height of the lifting bracket 51 according to the vibration frequency.

[0047] In this example, the height of the connection end between the spring 4 and the lifting bracket 51 can be adjusted by driving the lifting bracket 51 to lift by the driving member 52, thereby driving the adjustment of the angle and elongation of the spring 4, adjusting the horizontal stiffness of the spring 4, and achieving the purpose of adjusting the vibration frequency. Therefore, a monitoring mechanism is set on the structure to be damped to monitor the vibration frequency of the structure to be damped, and the angle and elongation of the corresponding spring 4 are calculated according to the vibration frequency of the structure to be damped, and the height of the lifting bracket 51 can be adjusted by the driving member 52.

[0048] In some optional embodiments, the mass block 2 includes a mass block container 21 and a counterweight iron sand 22 filled in the mass block container 21 .

[0049] Control frequency design of the harmonic liquid mass damper: K is stiffness, M is mass, K = nkcosθ, M = m 0 +m 1 +m δ , where m 0 is the fixed mass of the steel structure of the mass block shell, m 1 is the mass of iron sand or other materials filled in the cavity of the mass block, m δ is the additional mass of the liquid, n is the number of springs, and θ is the oblique angle of spring 4.

[0050] From the above control frequency design formula, it can be known that the control frequency of the damper is also related to the mass of the mass block 2. The mass of the mass block 2 can be adjusted by adjusting the amount of the weighted iron sand 22 in the mass block container 21. Therefore, the control frequency can also be adjusted by adjusting the mass of the mass block 2.

[0051] In addition, by adjusting the mass of the mass block 2, the mass ratio to the structure to be damped can also be adjusted. When the damper is used for a bridge under construction, as the cantilever continues to increase, its own mass gradually increases. At this time, if the mass of the damper is not changed or the damper is not added, the vibration reduction effect will be weakened. When this solution is adopted, as the bridge is erected, the cantilever gradually increases. By adding counterweight iron sand 22 in the mass block container 21, it can adapt to the erection of the bridge without replacing the damper or adding a damper.

[0052] In some optional embodiments, the cross-section of the mass container 21 is circular, and the diameter of the middle portion of the mass container 21 is smaller than the diameters of the upper and lower ends, and the spring 4 is connected to the middle portion of the mass container 21 .

[0053] In this example, in order to ensure that the spring 4 has sufficient elongation length and minimize the diameter of the damping fluid container 1, the mass block container 21 is designed to have a middle diameter that is smaller than the diameters of the upper and lower ends, that is, the vertical cross-section is in an "I" shape, and the spring 4 is connected to the middle of the mass block container 21. This can ensure the stability of the mass block 2 when it is pulled by the spring 4, and can also ensure that the spring 4 has sufficient elongation length, and can ensure that the mass block container 21 has a large enough volume. When the maximum mass of the mass blocks 2 is the same, the occupied area of ​​the mass blocks 2 can be minimized.

[0054] In some optional embodiments, the rolling element 3 is a rolling ball or a universal bull's eye wheel.

[0055] In this example, a plurality of (more than 3) cylindrical holes are opened at the bottom of the mass block container 21, and balls are placed in them or universal bull's eye wheels are embedded for rolling, so as to reduce the friction resistance of the mass block 2.

[0056] In addition, in this embodiment, more than three springs 4 are used, which are equally divided along the circumferential direction of the mass block 2. The damping liquid container 1 includes a barrel 11 and a mounting plate 12, the barrel 11 is located above the mounting plate 12 and connected to each other, the barrel 11 is used to hold the damping liquid, and the mounting plate 12 is used to connect to the structure to be damped.

[0057] To sum up, in this solution, since the spring 4 is set at an angle, it can provide an upward component of force for the mass block 2, and the damping fluid can also provide buoyancy for the mass block 2. Since the vertical buoyancy and the vertical component of force of the spring 4 balance the dead weight, the contact pressure of the mass block 2 on the bottom of the damping fluid container 1 is reduced, which can effectively reduce the frictional resistance at the bottom of the mass block 2, so that when the structure to be damped vibrates, it is no longer difficult to start, thereby effectively playing a vibration reduction role.

[0058] The connecting end between the spring 4 and the inner wall of the damping liquid container 1 is arranged through the height adjustment mechanism 5, that is, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 through the height adjustment mechanism 5. By adjusting the height of the connecting end between the spring 4 and the inner wall of the damping liquid container 1 through the height adjustment mechanism 5, the angle and elongation of the spring 4 can be adjusted, which is equivalent to adjusting the friction force at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, so as to achieve the purpose of adjusting the vibration frequency.

[0059] The end of the connecting rod 511 connected to the screw sleeve 524 is clamped in the limiting groove on the inner wall of the damping liquid container 1, so that when the driving motor 522 drives the screw 523 to rotate, the screw sleeve 524 will not rotate, but will only move vertically relative to the screw 523, thereby driving the end of the connecting rod 511 connected to the spring 4 to move vertically in the limiting groove to adjust the angle and elongation of the spring 4.

[0060] A vertical connecting rod 512 is provided at the lower part of the connecting rod 511, and the lower end of the vertical connecting rod 512 is connected to the spring 4. The vertical connecting rod 512 is located inside the inner wall of the damping liquid container 1 and is arranged vertically. Such a design enables the spring 4 to be in a horizontal state when the connecting rod 511 of the lifting bracket 51 is lowered to the top of the mass block 2. In addition, in order to ensure the stability of the mass block 2 when the spring 4 pulls the mass block 2, the connection end of the spring 4 and the mass block 2 is located at the middle and lower part of the mass block 2.

[0061] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0062] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0063] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A horizontal multi-directional low-frequency tuned liquid mass damper, characterized in that: include: A damping liquid container (1), which is used to contain the damping liquid and is connected to the structure to be damped; A mass block (2) is arranged in the damping liquid container (1), and a plurality of rolling elements (3) are arranged at the bottom of the mass block (2); A plurality of springs (4) are arranged at intervals along the circumference of the mass block (2), the springs (4) being arranged obliquely, one end of which is connected to the mass block (2), and the other end of which is connected to the inner wall of the damping fluid container (1), and the connection end of the spring (4) to the inner wall of the damping fluid container (1) is higher than the connection end to the mass block (2).

2. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 1, characterized in that: The inclination angles of the plurality of springs (4) are the same, and the connection ends of the springs (4) and the inner wall of the damping fluid container (1) are arranged via a height adjustment mechanism (5), wherein the height adjustment mechanism (5) is used to adjust the height of the connection ends of the springs (4) and the inner wall of the damping fluid container (1).

3. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 2, characterized in that: The height adjustment mechanism (5) comprises: a lifting bracket (51), which is arranged in the damping liquid container (1) and can move vertically in the damping liquid container (1), and is used to connect the connecting end of the spring (4) to the inner wall of the damping liquid container (1); A driving member (52) is connected to the lifting bracket (51) and is used to drive the lifting bracket (51) to move up and down.

4. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 3, characterized in that: The driving member (52) comprises: a support frame (521), a driving motor (522) and a screw rod (523); the support frame (521) is arranged on the top of the damping liquid container (1); the driving motor (522) is arranged above the support frame (521); the screw rod (523) is arranged vertically and connected to the output end of the driving motor (522); a screw rod sleeve (524) is sleeved on the screw rod (523); the lifting bracket (51) comprises a plurality of connecting rods (511) corresponding to the spring (4); one end of the connecting rod (511) is connected to the screw rod sleeve (524), and the other end is used to be connected to the spring (4).

5. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 4, characterized in that: A limiting groove corresponding to the connecting rod (511) is provided on the inner wall of the damping liquid container (1), and the end of the connecting rod (511) connected to the spring (4) extends into the limiting groove and moves vertically in the limiting groove.

6. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 5, characterized in that: The connecting rod (511) is connected to the spring (4) via a vertical connecting rod (512) disposed below the connecting rod.

7. The horizontal multi-directional low frequency tuned liquid mass damper according to any one of claims 1 to 6, characterized in that: It also includes a vibration monitoring mechanism and a control unit, wherein the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped, and the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism and control the driving member (52) to adjust the height of the lifting bracket (51) according to the vibration frequency.

8. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 1, characterized in that: The mass block (2) comprises a mass block container (21) and counterweight iron sand (22) filled in the mass block container (21), and the spring (4) is connected to the middle of the mass block container (21).

9. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 8, characterized in that: The cross section of the mass block container (21) is circular, and the diameter of the middle portion of the mass block container (21) is smaller than the diameters of the upper and lower ends.

10. The horizontal multi-directional low frequency tuned liquid mass damper according to claim 1, characterized in that: The rolling element (3) is a rolling ball or a universal bull's eye wheel.

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