A floating plate low-height dynamic vibration absorber and vibration reduction system

Abstract

The application discloses a kind of floating plate low height power vibration absorber, including mass, mass both ends are symmetrically arranged first support, first support is mutually perpendicular fixed part and support part, the support part and mass both ends are fixedly connected rubber layer, the bottom surface of mass distance fixed part bottom surface has interval S.The power vibration absorber presented in the application, mass, support and rubber layer are sequentially laminated connection, so that the height of whole power vibration absorber is reduced, and the driving of vehicle is not affected.The thickness of mass can be controlled, and the frequency range of power vibration absorber is adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of track vibration and noise reduction technology, in particular to a floating slab low-height dynamic vibration absorber and a vibration reduction system. BACKGROUND

[0002] Floating slab track beds are widely used in urban rail transit track vibration reduction systems, especially in sections such as tunnels where noise feedback is large. Generally, floating slabs are supported on the track bed by isolation dampers to isolate and reduce the vibration and noise generated when the vehicle is running. Dynamic vibration absorbers are also generally provided on the floating slab track bed to further absorb the low-frequency vibration and noise of the vehicle using the natural frequency of the mass block. The vibration absorption frequency range of the dynamic vibration absorber in the prior art is narrow, and the stiffness and vibration absorption frequency cannot be flexibly adjusted, and the installation height is too high.

[0003] Through retrieval, there are technical documents of dynamic vibration absorbers and vibration reduction systems for floating slab track beds in the prior art. For example, the utility model patent publication document with the publication number "CN220746454U" and the title "Floating slab track frequency modulation damping device" discloses a floating slab track frequency modulation damping device, which includes a plurality of frequency modulation units installed on the floating slab. The frequency modulation unit includes a pre-pressing frame, a damping block one, a damping block two, a damping block three, and a plurality of groups of bolts. The bottom of the pre-pressing frame forms an opening, and the pre-pressing frame covers the damping block one, the damping block two, and the damping block three on the floating slab. The plurality of groups of bolts pass through the pre-pressing frame to fix it on the floating slab. The damping block one and the damping block two have the same natural frequency and are different from the natural frequency of the damping block three. In the technical solution disclosed in the comparative document, the frequency modulation unit forms a cantilever beam structure that can adjust the vibration frequency within a certain range. However, due to the complex structure, the installation height of the entire dynamic vibration absorber is too high.

[0004] For example, the invention patent publication document with the publication number "CN110983868A" and the title "Fixed-frequency passive dynamic vibration absorption track structure and frequency design method" discloses a fixed-frequency passive dynamic vibration absorption track structure and frequency design method. The track structure includes a fixed-frequency vibration isolator, a floating track slab, a dynamic vibration absorber, and a slab inter-shear mechanism. The slab inter-shear mechanism is connected between two adjacent floating track slabs. The fixed-frequency vibration isolator is arranged between the floating track slab and the track foundation, and the stiffness curve of the fixed-frequency vibration isolator is a fixed-frequency stiffness curve. The dynamic vibration absorber is arranged on the floating track slab, and the vibration absorption frequency of the dynamic vibration absorber is equal to the natural frequency of the fixed-frequency vibration isolator. The dynamic vibration absorber of the comparative document has a fixed natural frequency, and it has no damping function itself, so the vibration isolation and noise reduction effect is limited. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a floating slab low-height dynamic vibration absorber, comprising a mass block, first supports symmetrically arranged at two ends of the mass block, the first supports being fixed parts and support parts perpendicular to each other, a rubber layer fixedly connected between the support parts and the two ends of the mass block, and a distance S between the bottom surface of the mass block and the bottom surface of the fixed part.

[0006] Further, a second support is arranged at one end of the rubber layer and the mass block, one side of the second support being detachably connected to the mass block and the other side being fixedly connected to the rubber layer.

[0007] Further, the one side of the second support and the mass block are connected through a step, and one end of the mass block is fixed on the step surface of the second support through a bolt.

[0008] Further, the connecting surfaces between the first support and the rubber layer and / or the connecting surfaces between the second support and the rubber layer are arranged obliquely.

[0009] Alternatively, the support part of the first support is a first plate-shaped member of L type, the second support is a second plate-shaped member reversely bent at two ends, the first plate-shaped member and the second plate-shaped member are engaged and buckled, and the rubber layer is connected between the first plate-shaped member and the second plate-shaped member.

[0010] Further, the two ends of the rubber layer are arranged obliquely.

[0011] Further, the rubber layer is composed of a plurality of rubber blocks arranged at intervals.

[0012] Further, the top of the rubber block is connected through a rubber cross beam extending along the width direction of the mass block.

[0013] Further, the mass block, the first support and the second support are made of metal, and the rubber layer is vulcanization-connected with the first support and the second support.

[0014] Further, a floating slab track vibration reduction system is also provided, comprising a track foundation, a floating slab track bed, a vibration isolator and a fastener, and further comprising the above floating slab low-height dynamic vibration absorber, the fixed part of the first support being a connecting lug, a waist hole being formed in the connecting lug, the mass block of the floating slab low-height dynamic vibration absorber being connected to the upper surface of the floating slab track bed through the connecting lug and a fixing bolt, the connecting lugs being distributed on both sides of the sleeper, and the floating slab low-height dynamic vibration absorber being arranged along the extension direction of the track.

[0015] Compared with the prior art, the technical scheme of the present application has the following beneficial effects: the dynamic vibration absorber provided by the present application is connected in turn and stacked between the mass block, the support and the rubber layer, so that the height of the entire dynamic vibration absorber is reduced and the driving of the vehicle is not affected. The thickness of the mass block can be controlled to adjust the frequency range of the dynamic vibration absorber. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Schematic diagram of the overall structure of the dynamic vibration absorber;

[0017] Figure 2 : Exploded structural diagram of a dynamic vibration absorber;

[0018] Figure 3 Schematic diagram of the local structure of the rubber layer Figure 1 ;

[0019] Figure 4 Schematic diagram of the overall structure of the track vibration reduction system;

[0020] Figure 5 : A schematic diagram of the top partial structure of the track vibration reduction system;

[0021] Figure 6 : Side view diagram of the track vibration reduction system;

[0022] Figure 7 Schematic diagram of the rubber layer structure;

[0023] Figure 8 Schematic diagram of the local structure of the rubber layer Figure 2 ;

[0024] Figure 9 : Figure 5 Enlarged view of a specific area. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] A low-height dynamic vibration absorber for floating slabs includes a mass block 11, with first supports 12 symmetrically arranged at both ends of the mass block 11. The first supports 12 are mutually perpendicular fixing parts and support parts. A rubber layer 13 is fixedly connected between the support parts and both ends of the mass block 11. The bottom surface of the mass block 11 is spaced S away from the bottom surface of the fixing part.

[0027] like Figures 1-3The mass 11 is connected with the first support 12 through the rubber layer 13. The connection in the direction of the track bed width is a laminated connection, which makes the height of the whole dynamic vibration absorber low and reduces the influence on the vehicle during running. The rubber layer 13 is used to isolate the vibration during the vehicle running. The mass 11 influences the absorption frequency of the dynamic vibration absorber by its weight and inherent frequency. The frequency of the whole dynamic vibration absorber can be adjusted by controlling and changing the thickness of the mass 11. The whole dynamic vibration absorber is connected to the track bed through the fixed part of the first support 12. The distance S is between the upper surface of the track bed and the lower surface of the mass 11, which provides a floating space for the mass 11 due to the flexible connection of the rubber layer 13. Thus, the mass 11 can further absorb and isolate the vibration of other frequencies based on its inherent frequency in cooperation with the rubber layer 13, so as to achieve a relatively wide frequency range of vibration absorption effect.

[0028] In a more preferred embodiment, a second support 14 is arranged at one end of the rubber layer 13 and the mass 11. The second support 14 is detachably connected to one side of the mass 11 and fixedly connected to the other side of the rubber layer 13. The first support 12, the second support 14, the rubber layer 13 and the mass 11 are still connected in a laminated manner as in the above embodiment, which does not affect the installation height of the whole dynamic vibration absorber. The detachable connection between the second support 14 and the mass 11 makes the mass 11 into a module with different thicknesses, which can be flexibly selected according to the need of the vibration absorption frequency.

[0029] In a more preferred embodiment, the second support 14 is connected to the mass 11 through a stepped lap joint, and the mass 11 is fixed to the stepped surface of the second support 14 by a bolt. In this embodiment, the mass 11 is engaged with the second support 14 in a mortise and tenon structure, so that the second support 14 provides stable and good support for the mass 11, and the connection of the bolt is convenient for replacement at any time.

[0030] In a more preferred embodiment, the connection surface between the first support 12 and the rubber layer 13 and / or the connection surface between the second support 14 and the rubber layer 13 is arranged to be inclined. For details, see Figure 3 In the above embodiment, the connection between the first support 12 and the rubber layer 13 or the connection between the second support 14 and the rubber layer 13 provides a damping and vibration isolation effect. The rubber layer 13 is continuously sheared with the settlement of the mass 11, which is not conducive to the service life of the rubber layer 13. Therefore, the above inclined arrangement can make the rubber layer 13 generate a supporting component force on the mass 11, which increases the shear stiffness of the rubber layer 13 to some extent and prolongs the service life.

[0031] In another possible implementation, the support part of the first support 12 is a first plate-shaped member 121 of L shape, the second support 14 is a second plate-shaped member 141 of two ends reversely bent, the first plate-shaped member 121 and the second plate-shaped member 141 are engaged and buckled, and the rubber layer 13 is connected between the first plate-shaped member 121 and the second plate-shaped member 141. For details, please refer to Figure 5 After the first plate-shaped member 121 and the second plate-shaped member 141 are engaged and buckled, the cross section of the rubber layer 13 connected therebetween presents a profile of two ends reversely bent. The two ends 132 arranged vertically provide shear stiffness, and the middle horizontal extension 133 provides vertical support, so that the vertical and shear stiffness is improved, which can ultimately affect the natural frequency of the dynamic vibration absorber. Moreover, between the two opposite ends of the first plate-shaped member 121 and the second plate-shaped member 141 engaged and buckled, a certain limit is also formed in the width direction of the mass block 11, so as to avoid excessive lateral displacement of the mass block 11.

[0032] Similarly to the above implementation, the two ends of the rubber layer 13 are arranged obliquely, for improving the shear stiffness of the rubber layer 13.

[0033] As shown in Figure 7 In a more preferred implementation, the rubber layer 13 is composed of a plurality of rubber blocks 131 arranged at intervals. In this way, the entire rubber layer 13 is divided into a plurality of spaced blocks, so as to reduce the shear stiffness of the entire rubber layer 13.

[0034] As shown, the top of the rubber block 131 is connected by a rubber beam 132 extending in the width direction of the mass block 11. After the rubber layer 13 is divided into a plurality of rubber blocks 131, there will be a gap between adjacent rubber blocks 131, and foreign matter on the track bed will easily enter the gap. After the rubber beam 132 is connected, the top end surface between the mass block 11 and the support is seamless, which solves the above problem.

[0035] In a more preferred implementation, the mass block 11, the first support 12 and the second support 14 are made of metal, and the rubber layer 13 is vulcanizedly connected with the first support 12 and the second support 14. The metal-made mass block 11, the first support 12 and the second support 14 have higher density, and in particular under the same quality requirement, the mass block 11 can have a lower height. Compared with the prior art in which the concrete-supported mass block needs to be connected with the rubber layer of such damping component on site by using adhesive, the vulcanization connection between the metal and the rubber layer 13 in the present implementation is convenient for pre-production on the production line, and the connection is more firm.

[0036] As shown in Figures 4-5 and Figure 9The floating slab track damping system comprises a track foundation 2, a floating slab track bed 3, a vibration isolator 4, a fastener 6, and the floating slab low-height dynamic vibration absorber 1 in the foregoing embodiment, the fixed part of the first support 12 is a connecting lug 122, a waist hole 123 is formed on the connecting lug, the mass block 11 of the floating slab low-height dynamic vibration absorber 1 is connected to the upper surface of the floating slab track bed 3 through the connecting lug 122 and a fixing bolt 5, the connecting lug 122 is distributed on both sides of the sleeper 31, and the floating slab low-height dynamic vibration absorbers are arranged in the extension direction of the track.

[0037] In the embodiment, the connecting lug 122 is distributed on both sides of the sleeper 31, so that the sleeper 31 is embedded in the interval between the connecting lugs 122, and thus the mass block 11 has a wider width, so that the thickness of the mass block 11 can be smaller under the same mass requirement, and thus the height of the entire system can be reduced. The waist hole 123 facilitates adjustment of the installation position of the dynamic vibration absorber 1. It should be noted that, in order to make the entire system have a wider frequency range, the mass blocks 11 in the arranged dynamic vibration absorbers 1 can be modules with different thicknesses, so that the dynamic vibration absorbers 1 have different natural frequencies, and thus the entire damping system has vibration absorbing frequencies of different frequencies.

[0038] It should be noted that, in the present document, the terms such as first and second are used only 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 "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device comprising the element.

[0039] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A floating plate low-height dynamic vibration absorber, characterized by, Including mass (11), the first support (12) of symmetrical setting at both ends of mass (11), the first support (12) is the fixed part and support part perpendicular to each other, the support part and mass (11) both ends are fixedly connected rubber layer (13), the bottom surface of mass (11) distance fixed part bottom surface has interval S; Second support (14) is further provided at rubber layer (13) and one end of mass (11), one side of second support (14) and mass (11) are detachably connected, the other side and rubber layer (13) are fixedly connected; The support part of first support (12) is L-shaped first plate-shaped member (121), second support (14) is second plate-shaped member (141) reversely bent at both ends, first plate-shaped member (121) and second plate-shaped member (141) are engaged and buckled, and rubber layer (13) is connected between first plate-shaped member (121) and second plate-shaped member (141).

2. The floating plate low-height dynamic vibration absorber of claim 1, wherein The second support (14) is connected to the mass (11) through a step lap, and the mass (11) is fixed to the step surface of the second support (14) by a bolt.

3. The floating plate low-height dynamic vibration absorber of claim 2, wherein, The connecting surface between the first support (12) and the rubber layer (13) and / or the connecting surface between the second support (14) and the rubber layer (13) is inclined.

4. The floating plate low-height dynamic vibration absorber of claim 3, wherein, Both ends of the rubber layer (13) are inclined.

5. The floating plate low-height dynamic vibration absorber of claim 1, wherein, The rubber layer (13) is composed of a plurality of rubber blocks (131) arranged at intervals.

6. The floating plate low-height dynamic vibration absorber of claim 5, wherein, The rubber blocks (131) are connected by rubber cross beams (132) extending along the width direction of the mass (11).

7. The floating plate low-height dynamic vibration absorber of claim 1, wherein The mass (11), the first support (12), and the second support (14) are made of metal, and the rubber layer (13) is vulcanizedly connected with the first support (12) and the second support (14).

8. A floating slab track vibration damping system comprising a track foundation (2), a floating slab track bed (3), a vibration isolator (4) and a fastener (6), characterized in that Further comprising the floating slab low-height dynamic vibration absorber (1) according to any one of claims 1-7, the fixed part of the first support (12) is a connecting lug (122), a waist hole (123) is formed on the connecting lug, the mass (11) of the floating slab low-height dynamic vibration absorber (1) is connected to the upper surface of the floating slab track bed (3) through the connecting lug (122) and a fixing bolt (5), the connecting lug (122) is distributed on both sides of the sleeper (31), and the floating slab low-height dynamic vibration absorber is arranged along the extension direction of the track.

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