Vibration damping device and its floating slab track

Abstract

The present invention belongs to the technical field of track vibration reduction, and particularly relates to a vibration reduction device and a floating slab track thereof. A vibration reduction device, the vibration reduction device comprising: an inner cylinder body for telescoping along a first direction; an isolation pipe fitting disposed inside the inner cylinder body and fixedly connected to the bottom of the inner cylinder body for separating the inner cavity of the inner cylinder body into an annular columnar cavity and a cylindrical cavity; a spring member located in the annular columnar cavity and having two ends respectively abutting against the top and bottom of the inner cylinder body; an inertia component located in the cylindrical cavity, the inertia component being fixedly connected to the top of the inner cylinder body and fixedly connected to the top of the isolation pipe fitting; an outer cylinder body for accommodating and fixing the inner cylinder body; wherein, the annular columnar cavity and the cylindrical cavity are filled with damping grease, and the damping grease is used for squeezing with the spring member and rotating and shearing with the inertia component to improve the viscous damping effect and dissipate and absorb vibration energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of track vibration reduction, and particularly relates to a vibration reduction device and a floating slab track thereof. Background Art

[0002] The steel spring floating slab track is a vibration reduction track structure form widely used and with good effect in urban rail transit. The traditional steel spring floating slab track works through traditional steel spring isolators. The basic principle is the spring vibration isolation effect of the steel spring combined with the viscous damping effect of damping grease. When the floating slab track vibrates up and down, on the one hand, the steel spring plays a supporting role to ensure the smoothness of the track and guarantee the safe operation of the train. On the other hand, the steel spring plays a spring vibration isolation role, isolating the vibration of the upper wheel-rail from being transmitted to the lower track foundation and reducing the influence of wheel-rail vibration on sensitive buildings, people and precision instruments around the track line. In addition, the damping grease is wrapped on the steel spring and will be squeezed and sheared during the deformation process of the steel spring, playing a viscous damping role and dissipating energy. However, the vertical vibration displacement of the floating slab track and the vertical deformation of the steel spring are extremely small, being required to be within ±3 mm. Therefore, the extrusion and shear effects on the damping grease are limited, resulting in limited viscous damping effect of the damping grease and limited ability to dissipate vibration energy. Most of the vibration energy isolated by the spring remains in the upper part of the track structure, causing the problem that the traditional floating slab track has insufficient vibration reduction ability for low-frequency environmental vibration within 20 Hz. In severe cases, problems such as loosening of fastener vibration, deterioration of rail corrugation, increase in wheel-rail vibration noise, and aggravation of in-vehicle vibration noise may even occur. Summary of the Invention

[0003] The purpose of the present invention is to solve the above deficiencies and provide a vibration reduction device and a floating slab track thereof.

[0004] In the first aspect, a vibration reduction device adopts the following technical solution:

[0005] A vibration reduction device, the vibration reduction device includes:

[0006] An inner cylinder for telescoping along a first direction;

[0007] An isolation pipe fitting disposed inside the inner cylinder and fixedly connected to the bottom of the inner cylinder for dividing the inner cavity of the inner cylinder into an annular columnar cavity and a cylindrical cavity;

[0008] A spring member located in the annular columnar cavity and having two ends respectively abutting against the top and bottom of the inner cylinder; for supporting the floating slab track and isolating vibration;

[0009] The inertial mass component is located inside the cylindrical cavity. The inertial mass component is fixedly connected to the top of the inner cylinder and the top of the isolation pipe component, and is used for amplifying the inertial effect to convert tiny linear vibration into large-amplitude rotational motion and absorbing the vibration energy of the floating plate track.

[0010] The outer cylinder is used for accommodating and fixing the inner cylinder.

[0011] Wherein, damping grease is filled inside the annular cylindrical cavity and the cylindrical cavity. The damping grease is used for extruding with the spring element or exerting viscous damping effect by extrusion, or rotating and shearing with the inertial mass component to improve the viscous damping effect and dissipate and absorb the vibration energy.

[0012] Further, the inner cylinder includes a top cover, a flexible protective sleeve and a bottom cylinder. The upper and lower ends of the flexible protective sleeve are respectively fastened and connected to the edges of the top cover and the bottom cylinder to form a closed and telescopic shell.

[0013] Further, the inertial mass component includes a ball screw, a ball nut and an inertial flywheel component. The top of the ball screw is fixedly connected to the top cover. The ball nut is sleeved on the ball screw and is connected and driven through the balls inside it. The bottom of the ball nut is fixedly connected to the inertial flywheel component and can drive the axis of the inertial flywheel component to rotate. The damping grease covers the inertial flywheel component.

[0014] Further, the inertial mass component further includes a bearing component, a bearing seat and a connecting component. The inner ring of the bearing component is fixedly connected to the side wall of the ball nut. The outer ring of the bearing component is fixed in the bearing seat with a matching shape. The bottom of the bearing seat is fixedly connected to the connecting component. The bearing seat, the connecting component and the outer diameter of the isolation pipe component are the same. The bottom of the connecting component is fixedly connected to the isolation pipe component and closes the cylindrical cavity.

[0015] Further, a convex part clamping structure is provided on the outer peripheral contour of the top cover, and the convex part clamping structure is used for clamping and fixing the inner cylinder.

[0016] Further, the outer cylinder includes an outer cylinder cover plate and an outer cylinder body. A concave part engaging structure is provided on the inner wall of the outer cylinder body for engaging and connecting with the convex part clamping structure provided on the outer contour of the top cover. The outer cylinder cover plate is arranged on the top of the outer cylinder body for closing the outer cylinder.

[0017] Further, the outer cylinder further includes a limiting component. The limiting components are arranged in a circular pattern on the side wall of the outer cylinder body. The limiting components are used for improving the biting force between the outer wall of the outer cylinder and the concrete interface and limiting and fixing the outer cylinder.

[0018] Second aspect, a floating slab track, adopts the following technical solution:

[0019] A floating slab track, the floating slab track includes the vibration damping device, the track, the floating slab and the foundation; the track is symmetrically arranged on the floating slab, the foundation is arranged at the bottom of the floating slab, and the vibration damping devices are arranged at intervals on both sides of the track.

[0020] Further, the outer cylinder of the vibration damping device is embedded in the floating slab and is fixedly engaged with the concrete through the limiting member, and the inner cylinder of the vibration damping device is accommodated inside the outer cylinder.

[0021] Advantages of the present invention:

[0022] A vibration damping device provided by the present invention, on the basis of the vibration isolation of the spring member and the damping vibration reduction, adds the vibration absorption function of the inertance component, and converts the vertical micro vibration displacement into the horizontal large displacement high-speed rotational motion of the inertial body through the inertance component, realizes the amplification of the vibration displacement and speed, and realizes the damping enhancement through the combination of the inertance component and the damping; when the floating slab track vibrates up and down, part of the vibration energy is isolated above the floating slab track by the spring member, a small part of the vibration energy is dissipated by the damping grease, part of the vibration energy is converted into the rotational motion mechanical energy of the inertial body, and another part of the vibration energy is dissipated by the damping grease with increased shear stroke and speed, and finally the energy isolated above the floating slab track is reduced, and the energy transmitted to the track foundation is also reduced. Description of the drawings

[0023] Figure 1 It is a schematic cross-sectional view of the inner cylinder in the vibration damping device provided by the present invention;

[0024] Figure 2 It is a schematic structural view of the inner cylinder in the vibration damping device provided by the present invention;

[0025] Figure 3 It is a schematic structural view of the inertance component in the vibration damping device provided by the present invention;

[0026] Figure 4 It is a schematic cross-sectional view of the inertance component in the vibration damping device provided by the present invention;

[0027] Figure 5 It is a schematic structural view of the outer cylinder in the vibration damping device provided by the present invention;

[0028] Figure 6 It is a schematic internal structure view of the outer cylinder in the vibration damping device provided by the present invention;

[0029] Figure 7 It is a top view of the outer cylinder in the vibration damping device provided by the present invention;

[0030] Figure 8 Structural schematic diagram of the floating slab track provided by the present invention;

[0031] Figure 9 Schematic diagram of the mechanical model 1 of the vibration damping device provided by the present invention;

[0032] Figure 10 Schematic diagram of the mechanical model 2 of the vibration damping device provided by the present invention;

[0033] Reference numerals: 1, vibration damping device; 10, inner cylinder; 20, isolation pipe fitting; 30, spring member; 40, inertia capacitance assembly; 50, damping grease; 60, outer cylinder; 2, floating slab track; 70, track; 80, floating slab; 90, foundation; 11, top cover; 111, convex part clamping structure; 12, flexible protective sleeve; 13, bottom cylinder; 14, hoop member; 41, ball screw; 42, ball nut; 43, inertia flywheel member; 44, bearing member; 45, bearing seat; 46, second pre-tightening bolt; 47, third pre-tightening bolt; 61, cover plate; 62, outer cylinder body; 621, concave part engaging structure; 63, limiting member. Detailed implementation manners

[0034] The following further specifically describes a vibration damping device and its floating slab track according to the present invention in combination with embodiments. For the sake of simplicity of description, this document cannot list all the alternative technical features and implementation manners included in the present invention. Therefore, those skilled in the art should know that any technical feature and implementation manner in this embodiment do not limit the protection scope of the present invention, and this protection scope includes any alternative technical features and implementation manners that those skilled in the art can obtain without creative work. Specifically, the implementation manners obtained by replacing any technical feature in the present invention or combining any two or more technical features provided by the present invention should be within the protection scope of the present invention.

[0035] This embodiment provides a vibration damping device 1, as Figure 1 shown. The vibration damping device 1 includes:

[0036] Inner cylinder 10, for telescoping along the first direction;

[0037] Isolation pipe fitting 20, arranged inside the inner cylinder 10 and fixedly connected to the bottom of the inner cylinder 10, for separating the inner cavity of the inner cylinder 10 into an annular columnar cavity and a cylindrical cavity;

[0038] Spring member 30, located in the annular columnar cavity, and its two ends respectively abut against the top and bottom of the inner cylinder 10; for supporting the floating slab track 2 and isolating vibration;

[0039] The inerter assembly 40 is located inside the cylindrical cavity. The inerter assembly 40 is fixedly connected to the top of the inner cylinder 10 and the top of the isolation pipe fitting 20. It is used to amplify the inertial effect, convert the tiny low-speed linear vibration into a large-amplitude high-speed rotational motion, and absorb the vibration energy of the floating slab track 2.

[0040] The outer cylinder 60 is used to accommodate and fix the inner cylinder 10.

[0041] Wherein, the annular cylindrical cavity and the cylindrical cavity are filled with damping grease 50. The damping grease 50 is used to squeeze with the spring member 30 or play a viscous damping role by squeezing, or rotate and shear with the inerter assembly 40 to improve the viscous damping effect and dissipate and absorb the vibration energy.

[0042] The vibration damping device 1 provided by this embodiment can efficiently isolate and dissipate the energy of low-frequency vibration through the mutual cooperation of the spring member 30, the inerter assembly 40 and the damping grease 50. Its inner cylinder 10 has the ability to expand and contract in the first direction, and can adapt to the displacement change of the floating slab track 2 in the vertical vibration. The isolation pipe fitting 20 divides the inner cavity of the inner cylinder 10 into an annular cylindrical cavity and a cylindrical cavity, which not only divides the inner cavity into multiple functional zones, but also provides a structural guarantee for the independent operation of the spring member 30 and the inerter assembly 40.

[0043] The two ends of the spring member 30 in the annular cylindrical cavity respectively abut against the top and bottom of the inner cylinder 10, and can support the weight of the floating slab track 2 and isolate the vibration. The elastic characteristics of the spring member 30 enable it to effectively weaken the vertical vibration caused by the operation of the rail train in the track system, and at the same time transfer part of the vibration energy to the semi-solid colloidal damping grease 50 wrapped by it. The semi-solid colloidal damping grease 50 enhances the viscous damping effect through the squeezing and stretching actions of the spring member 30, further dissipates the vibration energy, and thus reduces the amplitude of the vibration transmitted downward.

[0044] The inerter assembly 40 in the cylindrical cavity converts the tiny linear displacement in the vibration into a high-speed rotational motion through the inertial amplification effect. This conversion can not only redistribute the vibration energy, but also further dissipate the energy by using the shear action between the inertial flywheel and the fluid damping grease 50. Since the inerter assembly 40 can significantly amplify the inertial effect, increase the mass term of the vibration system, and reduce the natural frequency of the system, its vibration absorption effect in low-frequency vibration is particularly prominent, effectively suppressing the generation of resonance peaks and improving the overall performance of the vibration damping device 1.

[0045] The outer cylinder 60 is used to accommodate and fix the inner cylinder 10, providing external protection and structural support. At the same time, through the coordinated action of the spring member 30, the inertia component 40, and the semi-fixed colloidal or fluid damping grease 50, the stability and vibration reduction effect of the system are ensured. The vibration reduction device 1 forms a multi-level vibration control mechanism through the support and vibration isolation effect of the spring member 30, the inertia amplification effect of the inertia component 40, and the viscous energy dissipation effect of the semi-fixed colloidal or fluid damping grease 50, effectively isolating the low-frequency vibration of the floating slab track 2 and dissipating the vibration energy of the track system, thereby ensuring the smooth operation of the train and the long life of the track structure, while reducing the vibration interference to the surrounding environment.

[0046] In some embodiments, such as Figure 2 shown. The inner cylinder 10 includes a top cover 11, a flexible protective sleeve 12, and a bottom cylinder 13; the upper and lower ends of the flexible protective sleeve 12 are respectively fastened to the edges of the top cover 11 and the bottom cylinder 13 to form a closed and telescopic shell. Specifically, the upper and lower ends of the flexible protective sleeve 12 are respectively fastened to the edges of the top cover 11 and the bottom cylinder 13 through hoop members 14, and the flexible protective sleeve 12 can adapt to the telescopic deformation in the vertical direction, so that the inner cylinder 10 has the characteristic of telescopic deformation along the first direction, that is, the vertical direction.

[0047] The structure and material selection of the flexible protective sleeve 12 endow it with good flexibility and elasticity, and it can adaptively undergo telescopic deformation when the inner cylinder 10 is subjected to vertical vibration or load change. As a connecting component, the hoop member 14 can not only ensure the tight connection between the flexible protective sleeve 12 and the top cover 11 and the bottom cylinder 13, avoiding seal failure, but also effectively prevent the loosening or falling off of the flexible protective sleeve 12 during vibration. Through this structure, the inner cylinder 10 has the characteristic of telescopic deformation along the first direction (i.e., the vertical direction) and can adapt to the dynamic vibration environment of the floating slab track 2.

[0048] On the one hand, the closed and telescopic shell protects the internal cavity of the inner cylinder 10 and the components therein from the invasion of external factors such as dust and water vapor; on the other hand, the telescopic performance of the flexible protective sleeve 12 enables the inner cylinder 10 to flexibly respond to the vibration displacement in the vertical direction, thus ensuring the performance stability and adaptability of the vibration reduction device 1.

[0049] In addition, the sealing characteristic of the closed shell effectively prevents the leakage of the damping grease 50 and provides a good working environment for the extrusion and stretching energy dissipation of the semi-fixed colloidal damping grease 50; through the dynamic telescopic ability of the flexible protective sleeve 12, the inner cylinder 10 realizes the efficient absorption and management of the vibration energy of the floating slab track 2 system, thereby improving the reliability and service life of the overall vibration reduction device 1.

[0050] In some embodiments, such as Figure 3 、 4As shown in the figure. The inertance component 40 includes a ball screw 41, a ball nut 42, and an inertia flywheel member 43; the top of the ball screw 41 is fixedly connected to the top cover 11, the ball nut 42 is sleeved on the ball screw 41 and is connected and driven through the balls inside it, the bottom of the ball nut 42 is fixedly connected to the inertia flywheel member 43, and can drive the inertia flywheel member 43 to rotate around its axis; the damping grease 50 coats the inertia flywheel member 43, and the inertia flywheel member 43 is used to shear with the damping grease 50 during rotation. Specifically, the top of the ball screw 41 is fixed on the top cover 11 by a first pre-tightening bolt, and the top cover 11 is subjected to a sinking treatment, and the top of the ball screw 41 and the first pre-tightening bolt are not higher than the top cover 11; the flange of the ball nut 42 faces downward, and the inertia flywheel member 43 is bolt-fixed to the bottom of the flange by a second pre-tightening bolt 46.

[0051] The structure of the inertance component 40 fully embodies the combination of inertia amplification effect and vibration energy dissipation. This component includes a ball screw 41, a ball nut 42, and an inertia flywheel member 43, forming an efficient energy conversion and absorption system. The top of the ball screw 41 is fixed on the top cover 11 by a first pre-tightening bolt, and the top cover 11 is subjected to a sinking treatment, making the top of the ball screw 41 flush with the surface of the top cover 11 and not higher than the top cover 11, which can ensure the fastening of the component and also reduce the vertical space occupied by the whole device; the ball nut 42 is sleeved on the ball screw 41, and the balls inside it drive the ball nut 42 to rotate through the linear motion of the ball screw 41 during vibration. The flange of the ball nut 42 faces downward, and its bottom is fixedly connected to the inertia flywheel member 43 by a second pre-tightening bolt 46, thereby driving the inertia flywheel member 43 to rotate around its axis.

[0052] The inertia flywheel member 43 realizes the inertia amplification effect through rotation, converting the tiny linear vibration in the track system into a significant rotational motion. This rotational motion not only prolongs the energy dissipation stroke but also significantly improves the energy consumption efficiency; the inertia flywheel member 43 is coated with the fluid damping grease 50, and when the flywheel rotates, it shears with the fluid damping grease 50; the fluid damping grease 50 converts the rotational kinetic energy into heat energy through the viscous resistance between its internal molecules, effectively dissipating the vibration energy transmitted by the track system.

[0053] Specifically, the linkage mechanism of the ball screw 41, the ball nut 42, and the inertia flywheel member 43 drives the ball nut 42 to rotate through the linear motion of the ball screw 41, and further drives the inertia flywheel member 43 through the rotation of the ball nut 42. In this process, the inertance component 40 utilizes its inertia amplification characteristic to increase the mass term of the vibration system and reduce the natural frequency of the system, and can absorb low-frequency vibration, thereby effectively reducing the occurrence of low-frequency resonance; at the same time, the shearing energy dissipation effect of the inertia flywheel member 43 and the damping grease 50 enhances the vibration energy dissipation ability of the device.

[0054] In some embodiments, as Figure 3 , 4 shown. The inertance assembly 40 further includes a bearing member 44, a bearing seat 45 and a connecting member; the inner ring of the bearing member 44 is fixedly connected to the side wall of the ball nut 42, the outer ring of the bearing member 44 is fixed in a bearing seat 45 with a matching shape, the bottom of the bearing seat 45 is fixedly connected to the connecting member, the bearing seat 45, the connecting member and the isolation pipe member 20 have the same outer diameter, and the bottom of the connecting member is fixedly connected to the isolation pipe member 20 and closes the cylindrical cavity. Specifically, a bearing member 44 is installed on the side wall of the ball nut 42, the inner ring of the bearing member 44 is fixed on the side wall of the ball nut 42 by means of interference fit, bolt connection or snap ring stop connection, the outer ring of the bearing member 44 is fixed in a bearing seat 45 with a matching shape, the bearing seat 45 is bolted to the connecting member by a third pre-tightening bolt 47, the outer diameters of the bearing seat 45 and the connecting member are equal to the outer diameter of the isolation pipe member 20 and the outer walls are aligned for installation, and the bottom of the connecting member is welded to the isolation pipe member 20 and closes the cylindrical cavity.

[0055] The inertance assembly 40 includes a bearing member 44, a bearing seat 45 and a connecting member, which optimize the support and connection of the rotating components, while enhancing the stability and sealing performance of the device. The inner ring of the bearing member 44 is fixed on the side wall of the ball nut 42, and the fixing method of the inner ring can adopt interference fit, bolt connection or snap ring stop connection, ensuring the firm combination of the bearing member 44 and the ball nut 42 and providing stable support during rotation.

[0056] The outer ring of the bearing member 44 is installed in a bearing seat 45 with a matching shape, and the bearing seat 45 is fixed on the connecting member by a third pre-tightening bolt 47, forming a stable support structure. The outer diameters of the bearing seat 45 and the connecting member are the same as the outer diameter of the isolation pipe member 20, and the outer walls are aligned for installation, making the overall shape of the entire assembly consistent, which helps to simplify the installation process of the device and ensure the uniform stress of the overall structure.

[0057] The bottom of the connecting member is fixedly connected to the isolation pipe member 20 by welding, and at the same time closes the cylindrical cavity. It not only prevents the leakage of the fluid damping grease 50 in the cylindrical cavity, but also provides good sealing performance and support. All components of the inertance assembly 40 achieve smooth operation of the inertial flywheel member 43 during rotation through the cooperation of the bearing seat 45 and the connecting member, avoiding component offset or misalignment caused by rotation, thereby ensuring the reliability of the inertial amplification effect.

[0058] Specifically, the ball nut 42 transmits its rotational motion smoothly to the inertial flywheel 43 through the support of the bearing 44, while avoiding additional frictional losses of the rotating components during vibration. The combination of the bearing 44, the bearing housing 45, and the connecting piece not only enhances the mechanical strength of the rotating mechanism but also optimizes the layout of the inertance assembly 40 in the cylindrical cavity, making the inertance assembly 40 more compact and efficient. In addition, the sealing function of the connecting piece further improves the protection performance of the device, avoiding the influence of the external environment on the internal components, and ensuring that the fluid damping grease 50 in the cavity can fully exert its shear energy dissipation effect when the inertial flywheel 43 rotates. Through the above structure, the inertance assembly 40 realizes the organic unity of stability, sealing performance, and energy dissipation efficiency, providing a solid guarantee for the efficient operation of the vibration damping device 1 and significantly improving its reliability and durability in practical applications.

[0059] In some embodiments, as Figure 2 shown. The outer peripheral contour of the top cover 11 is provided with a convex part clamping structure 111, and the convex part clamping structure 111 is used for clamping and fixing the inner cylinder 10. Specifically, the outer peripheral contour of the top cover 11 is provided with convex part structures arranged in a circular pattern, which can be clamped and fixed with the matching concave part structures, avoiding shaking and tilting, and enhancing the stability and reliability of the vibration damping device 1.

[0060] The outer peripheral contour of the top cover 11 is provided with convex part structures arranged in a circular pattern, and the convex part structures are clamped and combined with the matching concave part structures on the inner cylinder 10. Through this structure of convex and concave cooperation, the top cover 11 can be firmly connected to the inner cylinder 10, avoiding loosening caused by vibration or external forces. This clamping and matching structure keeps the inner cylinder 10 in a stable position during use, reduces the relative displacement between components, and thus improves the working accuracy and long-term stability of the vibration damping device 1.

[0061] In addition, the clamping structure of the top cover 11 also has a certain self-locking property, which can provide continuous fixing after the device is installed, avoiding structural instability caused by vibration or changes in the external environment, not only improving the overall reliability but also enhancing the anti-interference ability against external vibration and ensuring the efficient operation of the device in a complex working environment.

[0062] In some embodiments, as Figure 5 、 6 、7 shown. The outer cylinder 60 includes an outer cylinder 60 cover plate 61 and an outer cylinder body 62; the inner wall of the outer cylinder body 62 is provided with a concave part engaging structure 621 for engaging and connecting with the convex part clamping structure 111 provided on the outer contour of the top cover 11; the outer cylinder 60 cover plate 61 is arranged on the top of the outer cylinder body 62 to close the outer cylinder 60.

[0063] The outer cylinder 60 includes a cover plate 61 of the outer cylinder 60 and an outer cylinder body 62, forming a structurally compact and highly sealed external protective housing. The inner wall of the outer cylinder 60 is provided with a concave engaging structure 621 for cooperating with a convex engaging structure 111 on the outer contour of the top cover 11 to achieve a fixed connection. Through the convex-concave engaging structure, the outer cylinder body 62 and the top cover 11 can be firmly combined, avoiding loosening or detachment caused by vibration or external forces, thereby enhancing the stability of the overall device.

[0064] The cover plate 61 of the outer cylinder 60 is arranged on the top of the outer cylinder body 62 to close the outer cylinder 60, further enhancing the sealing performance and protective effect of the device. The cover plate 61 of the outer cylinder 60 not only effectively prevents external pollutants such as dust and moisture from entering the internal structure, but also provides additional support and stability, ensuring the integrity and functionality of the device during operation.

[0065] In some embodiments, such as Figure 5 , 6 , as shown in Figure 7. The outer cylinder 60 further includes a limiting member 63. The limiting member 63 is arranged in a circular pattern on the side wall of the outer cylinder body 62. The limiting member 63 is used to increase the frictional force between the outer wall of the outer cylinder 60 and the concrete interface and limit and fix the outer cylinder 60. Specifically, the side wall of the outer cylinder 60 is provided with limiting pins in a circular pattern. By adjusting the limiting pins, the outer cylinder 60 can be limited and fixed.

[0066] The outer cylinder 60 further includes a limiting member 63. The limiting member 63 is arranged in a circular pattern on the side wall of the outer cylinder body 62 for limiting and fixing the outer cylinder 60. It can effectively prevent the outer cylinder 60 from shifting or loosening during use, thereby ensuring the structural stability of the entire vibration damping device 1.

[0067] Specifically, the side wall of the outer cylinder 60 is provided with limiting pins in a circular pattern. By adjusting the installation position of the limiting pins, the outer cylinder 60 can be accurately limited and fixed. This design enables the device to adapt to different working environments and ensures the fixation of each component during vibration, impact, or long-term operation.

[0068] The adjustment function of the limiting pins not only increases the adjustability of the device but also improves the ability to precisely control the position of components during production and maintenance. During the assembly process of the device, the adjustment of the limiting pins ensures that the outer cylinder 60 can be accurately positioned and firmly fixed, avoiding instability caused by structural loosening.

[0069] This embodiment provides a floating slab track 2, such as Figure 8As shown in the figure. The floating slab track 2 includes the above-mentioned vibration damping device 1, track 70, floating slab 80 and foundation 90; the track 70 is symmetrically arranged on the floating slab 80, the foundation 90 is arranged at the bottom of the floating slab 80, and the vibration damping devices 1 are arranged at intervals on both sides of the track 70.

[0070] In some embodiments, the outer cylinder 60 of the vibration damping device 1 is embedded in the floating slab 80 and is fixedly engaged with the concrete through the limiting member 63, and the inner cylinder 10 of the vibration damping device 1 is accommodated inside the outer cylinder 60.

[0071] The floating slab track 2 realizes effective isolation and energy dissipation of track vibration by combining the above-mentioned vibration damping device 1. The floating slab track 2 includes components such as the vibration damping device 1, track 70, floating slab 80 and foundation 90. Among them, the outer cylinder 60 of the vibration damping device 1 is embedded in the floating slab 80, and the inner cylinder 10 is accommodated inside the outer cylinder 60. With this structure, the vibration damping device 1 can provide a stable vibration damping effect in the floating slab 80 and ensure that the vibration energy of the floating slab track 2 is effectively absorbed and dissipated.

[0072] Specifically, the cooperation between the outer cylinder 60 of the vibration damping device 1 and the floating slab 80 provides a firm support, and through the combination of the outer cylinder 60 and the inner cylinder 10, the vibration damping effect of the floating slab 80 in the track system is ensured. The inner cylinder 10, as a key component of the vibration damping device 1, through cooperation with the outer cylinder 60, converts the vibration energy into heat energy or reduces the transmission of low-frequency vibration through the inertial amplification effect, thereby effectively isolating the vibration of the floating slab track 2. The track 70 is symmetrically arranged on the upper part of the floating slab 80, ensuring uniform distribution of the load of the track 70 and stability during operation. The foundation 90 is located at the bottom of the floating slab, playing a supporting role to ensure the overall structural stability of the floating slab track 2 system.

[0073] With the above structure, the floating slab track 2 can not only achieve effective vibration isolation between the track and the foundation, reduce the influence of vibration caused by train operation on the surrounding environment, but also improve the running smoothness of the track system and the reliability of long-term use. This floating slab track 2 system is applicable to various rail transit systems, especially in application scenarios with high requirements for vibration control and noise reduction, and has a wide application prospect.

[0074] The working principle of the vibration damping device 1 provided by the present invention

[0075] When the floating slab track 2 vibrates up and down, in the vibration damping device 1, there will be a relative vertical displacement between the top cover 11 and the bottom cylinder 13 of the inner cylinder 10, and this relative vertical displacement is eliminated through the flexible deformation of the flexible protective sleeve 12.

[0076] When the floating slab track 2 vibrates up and down, similar to the traditional steel spring isolator, the basic working principle of the vibration damping device 1 provided by the present invention includes the vibration isolation effect of the spring member 30 combined with the viscous damping effect of the semi-solid colloidal grease 50. On the one hand, the spring member 30 plays a supporting role to ensure the smoothness of the track and guarantee the safe operation of the train. On the other hand, the spring member 30 plays a spring vibration isolation role, isolating the vibration of the upper wheel-rail from being transmitted to the lower track foundation and reducing the impact of wheel-rail vibration on sensitive buildings, people and precision instruments around the track line. In addition, the semi-solid colloidal grease 50 is wrapped around the spring member 30 and will be squeezed and stretched during the deformation of the spring member 30, exerting a viscous damping effect. However, the vertical deformation of the spring member 30 is extremely small, being required to be within ±3 mm, so the squeezing and stretching effect on the semi-solid colloidal grease 50 is limited, resulting in limited viscous damping effect of the semi-solid colloidal grease 50 and limited dissipation capacity of vibration energy. Most of the vibration energy isolated by the spring remains in the upper part of the track structure, causing vibration amplification of the upper track structure and the vehicle structure. In severe cases, problems such as loosening of fastener vibration, deterioration of rail corrugation, increase in wheel-rail vibration noise, and aggravation of in-vehicle vibration noise may occur. Therefore, the vibration damping device 1 provided by the present invention adds an inertia capacitance component 40 and a fluid damping grease 50 inside the steel spring of the traditional steel spring isolator.

[0077] When the floating slab track 2 vibrates up and down, in the vibration damping device 1, there will be a relative vertical displacement between the top cover 11 and the bottom cylinder 13 of the inner cylinder 10. The top end of the ball screw 41 is fixed to the top cover 11 by the first pre-tightening bolt. Therefore, the ball screw 41 will move linearly upward or linearly downward during vibration without rotation. The ball nut 42 and the inertia flywheel member 43 are fixedly connected together by the second pre-tightening bolt 46. The ball screw 41 drives the ball nut 42 and the inertia flywheel member 43 to rotate clockwise or counterclockwise together through the ball screw 41 mechanism. Among them, when the ball screw 41 moves upward, it corresponds to the ball nut 42 and the inertia flywheel member 43 rotating clockwise together, or when the ball screw 41 moves downward, it corresponds to the ball nut 42 and the inertia flywheel member 43 rotating clockwise together.

[0078] When the floating slab track 2 vibrates up and down, in a certain situation, the ball screw 41 moves linearly downward without rotation. The ball screw 41 drives the ball nut 42 and the inertia flywheel member 43 to rotate clockwise together through the ball screw 41 mechanism. The ball screw 41 moves linearly downward without rotation to reach the lowest point, where the linear motion speed and the rotational motion speed are equal to zero, and the linear motion acceleration and the rotational motion acceleration reach the maximum, and the inertia force reaches the maximum. When changing direction, the ball screw 41 moves linearly upward without rotation, and the ball screw 41 drives the ball nut 42 and the inertia flywheel member 43 to rotate counterclockwise together through the ball screw 41 mechanism.

[0079] The ball nut 42 and the inertial flywheel member 43 together form an inertial body. The inertial flywheel member 43 shears with the fluid damping grease 50, exerting the viscous damping effect of the fluid damping grease 50 to dissipate energy. Due to the existence of the ball screw 41 mechanism, a transmission ratio is achieved through a mechanical structure. By using a small physical mass inertial flywheel member 43 and the ball nut 42 together to form an inertial body, a large inertial force can be realized to achieve a large inertial mass, realizing the inertial amplification effect. The vertical vibration mechanical energy of the floating slab track 2 is converted into the rotational motion mechanical energy of the inertial body formed by the inertial flywheel member 43 and the ball nut 42 together, realizing the inertial vibration absorption and amplification effect. Due to the existence of the ball screw 41 mechanism, the micro amplitude and low speed (not exceeding ±3 mm) linear motion of the floating slab track 2, the top cover 11 and the ball screw 41 can be converted into the high linear velocity rotation of the outer wall of the inertial flywheel member 43. The high linear velocity rotation of the outer wall of the inertial flywheel member 43 increases the shear stroke and speed between it and the fluid damping grease 50, realizing the conversion of the micro amplitude and low speed vertical linear motion into the large amplitude and high linear velocity horizontal rotational motion, and realizing the damping enhancement of the viscous damping effect, dissipating energy, and realizing the damping and vibration reduction enhancement effect.

[0080] When the floating slab track 2 vibrates up and down, the wheel-rail force is transmitted downward to the floating slab track 2, and then downward to the top cover 11 of the vibration damping device 1. A part of the load is further transmitted to the spring member 30, and then to the track base. Another part of the load is further transmitted to the ball screw 41, then to the ball nut 42, then to the bearing member 44, then to the bearing seat 45, then to the connecting member, then to the isolation pipe member 20, and finally to the track base.

[0081] When the floating slab track 2 vibrates up and down, a part of the vibration energy of the floating slab track 2 is isolated above the floating slab track 2 by the spring member 30, a small part of the vibration energy is dissipated by the semi-solid colloidal damping grease 50, a part of the vibration energy is converted into the rotational motion mechanical energy of the inertial body formed by the inertial flywheel member 43 and the ball nut 42 together with a large amplitude and high linear velocity horizontal rotation, and a part of the vibration energy is dissipated by the fluid damping grease 50 with an increased shear stroke and speed. Finally, the energy isolated above the floating slab track 2 is reduced, and the energy transmitted to the track base is also reduced.

[0082] The mechanical model of the vibration damping device 1 of the present invention

[0083] The mechanical model of the vibration damping device 1 provided by the present invention is as Figure 9As shown. Where k1 represents the spring member 30, c1 represents the semi-solid colloidal damping grease 50, b represents the inertia capacitance assembly 40 with the combination of the inertia flywheel member 43 and the ball nut 42 as the core, c2 represents the fluid damping grease 50, the parallel connection of k1 and c1 represents the existing parallel structure of the spring member 30 and the semi-solid colloidal damping grease 50, the parallel connection of b and c2 represents the additional parallel structure of the inertia capacitance assembly 40 and the fluid damping grease 50, and then the existing structure and the additional structure are connected in parallel again.

[0084] In order to save raw materials and reduce costs, the mechanical model of the vibration damping device 1 is as Figure 10 shown. Where k1 represents the spring member 30, b represents the inertia capacitance with the combination of the inertia flywheel member 43 and the ball nut 42 as the core, c2 represents the fluid damping grease 50, the parallel connection of k1 and c1 represents the existing spring member 30 structure, the parallel connection of b and c2 represents the additional parallel structure of the inertia capacitance assembly 40 and the fluid damping grease 50, and then the existing structure and the additional structure are connected in parallel again.

[0085] For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here, and the obvious changes or modifications derived therefrom are still within the protection scope of the claims of the present invention.

Claims

1. A vibration damping device, characterized in that, The vibration damping device includes: An inner cylinder body, which is used for telescoping along the first direction; the inner cylinder body includes a top cover, a flexible protective sleeve and a bottom cylinder; the upper and lower ends of the flexible protective sleeve are respectively fixedly connected to the edges of the top cover and the bottom cylinder to form a closed telescopic shell; An isolation pipe fitting, which is arranged inside the inner cylinder body and fixedly connected to the bottom of the inner cylinder body, and is used for dividing the inner cavity of the inner cylinder body into an annular columnar cavity and a cylindrical cavity; A spring member, which is located in the annular columnar cavity, and its two ends respectively abut against the top and the bottom of the inner cylinder body; it is used for supporting the floating slab track and isolating vibration; An inertia component, which is located in the cylindrical cavity, the inertia component is fixedly connected to the top of the inner cylinder body and fixedly connected to the top of the isolation pipe fitting; the inertia component includes a ball screw, a ball nut, an inertia flywheel member, a bearing member, a bearing seat and a connecting member; the top of the ball screw is fixedly connected to the top cover, the ball nut is sleeved on the ball screw and is connected and driven through the balls inside it, the bottom of the ball nut is fixedly connected to the inertia flywheel member, and can drive the axis of the inertia flywheel member to rotate; the annular columnar cavity and the cylindrical cavity are filled with damping grease, and the damping grease covers the inertia flywheel member; the inner ring of the bearing member is fixedly connected to the side wall of the ball nut, the outer ring of the bearing member is fixed in the bearing seat with a matching shape, the bottom of the bearing seat is fixedly connected to the connecting member, the bearing seat, the connecting member and the outer diameter of the isolation pipe fitting are the same, and the bottom of the connecting member is fixedly connected to the isolation pipe fitting and closes the cylindrical cavity; and An outer cylinder body, which is used for accommodating and fixing the inner cylinder body.

2. The vibration damping device according to claim 1, wherein The outer peripheral contour of the top cover is provided with a convex part clamping structure, and the convex part clamping structure is used for clamping and fixing the inner cylinder body.

3. The vibration damping device according to claim 2, wherein The outer cylinder body includes an outer cylinder body cover plate and an outer cylinder body main body; the inner wall of the outer cylinder body main body is provided with a concave part engaging structure, which is used for engaging and connecting with the convex part clamping structure provided on the outer contour of the top cover; the outer cylinder body cover plate is arranged on the top of the outer cylinder body main body and is used for closing the outer cylinder body.

4. The vibration damping device according to claim 3, characterized in that The outer cylinder body further includes a limiting member, and the limiting members are arranged in a circular arrangement on the side wall of the outer cylinder body main body. The limiting members are used to improve the frictional force between the outer wall of the outer cylinder body and the concrete interface and limit and fix the outer cylinder body.

5. A floating slab track, characterized in that, The floating slab track includes the vibration damping device according to any one of claims 1-4, a track, a floating slab and a foundation; the tracks are symmetrically arranged on the floating slab, the foundation is arranged at the bottom of the floating slab, and the vibration damping devices are arranged at intervals on both sides of the track.

6. The floating slab track according to claim 5, wherein The outer cylinder body of the vibration damping device is embedded in the floating slab and is fixedly engaged with the concrete through the limiting member, and the inner cylinder body of the vibration damping device is accommodated inside the outer cylinder body.

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