Floating slab low-height dynamic vibration absorber and vibration reduction system

Abstract

A floating slab low-height dynamic vibration absorber comprises a mass block, first supports are symmetrically arranged at the two ends of the mass block, each first support comprises a fixing part and a supporting part which are perpendicular to each other, rubber layers are fixedly connected between the supporting parts and the two ends of the mass block, and the distance between the bottom face of the mass block and the bottom face of the fixing part is S. According to the dynamic vibration absorber, the mass block, the support and the rubber layer are sequentially connected in the laminated mode, so that the height of the whole dynamic vibration absorber is reduced, and running of a vehicle is not affected. The thickness of the mass block can be controlled, and the frequency range of the dynamic vibration absorber can be adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of track vibration reduction and noise reduction, and in particular to a floating plate low-height dynamic vibration absorber and a vibration reduction system. Background Art

[0002] Floating slab roadbed is widely used in the vibration reduction system of urban rail transit, especially in sections with large noise feedback such as tunnels. Generally speaking, the floating slab is supported on the roadbed by an isolation shock absorber to isolate the vibration and noise generated by the running of the vibration reduction vehicle. A dynamic vibration absorber is generally provided on the floating slab roadbed to further absorb the low-frequency vibration and noise of the vehicle by using the natural frequency of the mass block. In the prior art, the vibration absorption frequency range of the dynamic vibration absorber is relatively narrow, the stiffness and vibration absorption frequency cannot be flexibly adjusted, and the installation height is too high.

[0003] Through searching, technical documents related to dynamic vibration absorbers and vibration reduction systems of floating plate track beds have been disclosed in the prior art. For example, the utility model authorization announcement document with the publication number "CN220746454U" and the name "A floating plate track frequency modulation and damping device". A floating plate track frequency modulation and damping device is disclosed, including multiple groups of frequency modulation units installed on the floating plate, the frequency modulation units include a pre-stressing frame, a damping block 1, a damping block 2, a damping block 3 and a number of groups of bolts, the bottom of the pre-stressing frame is formed with an opening, the pre-stressing frame covers the damping block 1, the damping block 2 and the damping block 3 on the floating plate, and a number of groups of the bolts penetrate the pre-stressing frame to fix it on the floating plate, the damping block 1 and the damping block 2 have the same natural frequency, which is different from the natural frequency of the damping block 3. In the technical solution disclosed in the comparative document, the frequency modulation unit constitutes a cantilever beam structure, which can adjust the vibration frequency within a certain range, but due to its 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 name "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, wherein the track structure includes a fixed-frequency vibration isolator, a floating track plate, a dynamic vibration absorber and an inter-plate shear mechanism, an inter-plate shear mechanism is connected between two adjacent floating track plates, the fixed-frequency vibration isolator is arranged between the floating track plate and the track foundation, 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 plate, and the vibration absorption frequency of the dynamic vibration absorber is equal to the natural frequency of the fixed-frequency vibration isolator. The natural frequency of the dynamic vibration absorber in this comparative document is constant, and it itself has no vibration reduction and damping function, and the vibration isolation and noise reduction effects are limited. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a floating plate low-height dynamic vibration absorber, comprising a mass block, and first brackets symmetrically arranged at both ends of the mass block, the first bracket comprising a fixing part and a supporting part that are perpendicular to each other, a rubber layer is fixedly connected between the supporting part and both ends of the mass block, and the bottom surface of the mass block is spaced S from the bottom surface of the fixing part.

[0006] Furthermore, a second bracket is provided at one end of the rubber layer and the mass block, and one side of the second bracket is detachably connected to the mass block and the other side is fixedly connected to the rubber layer.

[0007] Furthermore, one side of the second bracket and the mass block are overlapped by a step, and one end of the mass block is fixed to the step surface of the second bracket by a bolt.

[0008] Furthermore, the connection surface between the first bracket and the rubber layer and / or the connection surface between the second bracket and the rubber layer are arranged to be inclined.

[0009] Alternatively, the supporting portion of the first bracket is an L-shaped first plate-like member, the second bracket is a second plate-like member with both ends bent in opposite directions, the first plate-like member and the second plate-like member are engaged with a buckle, and the rubber layer is connected between the first plate-like member and the second plate-like member.

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

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

[0012] Furthermore, the top of the rubber block is connected by a rubber beam extending along the width direction of the mass block.

[0013] Furthermore, the mass block, the first bracket and the second bracket are made of metal, and the rubber layer is connected to the first bracket and the second bracket by vulcanization.

[0014] A floating plate track vibration reduction system is also proposed, including a track foundation, a floating plate ballast, a vibration isolator and fasteners, and also includes the above-mentioned floating plate low-height dynamic vibration absorber, the fixing part of the first bracket is a connecting ear, a waist hole is provided on the connecting ear, the mass block of the floating plate low-height dynamic vibration absorber is connected to the upper surface of the floating plate ballast through the connecting ear and fixing bolts, the connecting ears are distributed on both sides of the sleepers, and the floating plate low-height dynamic vibration absorber is arranged along the extension direction of the track.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the dynamic vibration absorber proposed by the present invention has a mass block, a bracket and a rubber layer which are sequentially laminated and connected, so that the height of the entire dynamic vibration absorber is reduced and will not affect the driving of the vehicle. The thickness of the mass block can be controlled to adjust the frequency range of the dynamic vibration absorber. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the overall structure of the dynamic vibration absorber; Figure 2 : Schematic diagram of the exploded structure of the dynamic vibration absorber; Figure 3 :Schematic diagram of the local structure of the rubber layer Figure 1 ; Figure 4 : Schematic diagram of the overall structure of the track vibration reduction system; Figure 5 : Schematic diagram of the top local structure of the track vibration reduction system; Figure 6 : Side structural diagram of the track vibration reduction system; Figure 7 : Schematic diagram of the structure of the rubber layer; Figure 8 :Schematic diagram of the local structure of the rubber layer Figure 2 ; Fig. 9 : Figure 5 Partial enlargement. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A floating plate low-height dynamic vibration absorber comprises a mass block 11, two ends of the mass block 11 are symmetrically arranged first brackets 12, the first bracket 12 is a fixing part and a supporting part perpendicular to each other, a rubber layer 13 is fixedly connected between the supporting part and the two ends of the mass block 11, and the bottom surface of the mass block 11 is spaced S from the bottom surface of the fixing part.

[0019] like Figure 1~Figure 3As shown. The two sides of the mass block 11 and the first bracket 12 are connected by a rubber layer 13. This sequential stacking connection along the width of the roadbed allows the height of the entire dynamic vibration absorber to be within a relatively low range, reducing the impact on the vehicle during driving. The rubber layer 13 is used to isolate the vibration of the vehicle when it is running. The mass block 11 uses its own weight and natural frequency to affect the absorption frequency of the dynamic vibration absorber. By controlling and changing the thickness of the mass block 11, the frequency of the entire dynamic vibration absorber can be adjusted. The entire dynamic vibration absorber is horizontally connected to the track roadbed through the fixed part of the first bracket 12, and the spacing S occurs between the upper surface of the roadbed and the lower surface of the mass block 11, providing the mass block 11 with a certain floating space due to the flexible connection of the rubber layer 13, so that the mass block 11 and the rubber layer 13 can further absorb and isolate vibrations of other frequencies on the basis of their own natural frequency, thereby achieving a vibration absorption effect in a relatively wide frequency domain.

[0020] In a more preferred embodiment, a second bracket 14 is further provided at one end of the rubber layer 13 and the mass block 11, and one side of the second bracket 14 is detachably connected to the mass block 11, and the other side is fixedly connected to the rubber layer 13. The first bracket 12, the second bracket 14, the rubber layer 13, and the mass block 11 still continue the stacked connection in the above embodiment, which will not affect the installation height of the entire dynamic vibration absorber. In addition, the detachable connection between the second bracket 14 and the mass block 11 allows the mass block 11 to be made into a suitable module of different thicknesses, and the mass blocks 11 of different thicknesses can be flexibly selected to be installed on the second bracket 14 according to the required vibration absorption frequency.

[0021] In a more preferred embodiment, one side of the second bracket 14 and the mass block 11 are overlapped by a step, and one end of the mass block 11 is fixed to the step surface of the second bracket 14 by bolts. In this embodiment, the mass block 11 is engaged with the second bracket 14 similar to a mortise and tenon structure, so that the second bracket 14 can provide a stable and good support for the mass block 11, and the bolt connection is easy to disassemble and replace at any time.

[0022] In a more preferred embodiment, the connection surface between the first bracket 12 and the rubber layer 13 and / or the connection surface between the second bracket 14 and the rubber layer 13 is arranged obliquely. Figure 3 In the above embodiment, the connection between the first bracket 12 and the rubber layer 13 or between the second bracket 14 and the rubber layer 13 provides a damping and vibration isolation effect, and the rubber layer 13 will be continuously sheared as the mass block 11 settles, which is not good for the service life of the rubber layer 13. Therefore, by adopting the above inclined setting, the rubber layer 13 can generate a supporting force component for the mass block 11, which increases the shear stiffness of the rubber layer 13 to a certain extent and prolongs the service life.

[0023] In another possible embodiment, the support portion of the first bracket 12 is an L-shaped first plate-like member 121, the second bracket 14 is a second plate-like member 141 with both ends bent in opposite directions, the first plate-like member 121 and the second plate-like member 141 are engaged with a buckle, and the rubber layer 13 is connected between the first plate-like member 121 and the second plate-like member 141. For details, see Figure 5 . After the first plate-like member 121 and the second plate-like member 141 are engaged with the buckle, the cross section of the rubber layer 13 connected therebetween presents a profile with opposite bends at both ends. The two upright ends 132 provide shear stiffness, and the middle horizontal extension 133 provides vertical support, so that the vertical and shear stiffness are improved, which can ultimately affect the natural frequency of the dynamic vibration absorber. In addition, between the two opposite ends of the first plate-like member 121 and the second plate-like member 141 engaged with the buckle, a certain limit is correspondingly formed in the width direction of the mass block 11 to avoid excessive lateral displacement of the mass block 11.

[0024] Similar to the above embodiment, both ends of the rubber layer 13 are inclined to improve the shear stiffness of the rubber layer 13 .

[0025] like Figure 7 In a more preferred embodiment, 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, thereby reducing the shear stiffness of the entire rubber layer 13.

[0026] As shown in the figure, the top of the rubber block 131 is connected by a rubber crossbeam 132 extending along 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 roadbed will easily enter the gap. After the rubber crossbeam 132 is connected, the top end surface adjacent to the mass block 11 and the bracket is seamless, solving the above-mentioned problem.

[0027] In a more preferred embodiment, the mass block 11, the first bracket 12, and the second bracket 14 are made of metal, and the rubber layer 13 is vulcanized to the first bracket 12 and the second bracket 14. The mass block 11, the first bracket 12, and the second bracket 14 made of metal have a higher density, especially under the same quality requirements, the mass block 11 can have a lower height. Compared with the mass block supported by concrete in the prior art, it is necessary to connect the damping components such as the rubber layer on site by gluing, while the vulcanization connection between the metal and the rubber layer 13 in this embodiment is convenient for prefabrication on the production line, and the connection is more firm.

[0028] like Figure 4~Figure 5 as well as Fig. 9A floating plate track vibration reduction system includes a track foundation 2, a floating plate track bed 3, a vibration isolator 4 and a fastener 6. In the above-mentioned embodiment, the floating plate low-height dynamic vibration absorber 1, the fixing part of the first bracket 12 is a connecting ear 122, and a waist hole 123 is provided on the connecting ear. The mass block 11 of the floating plate low-height dynamic vibration absorber 1 is connected to the upper surface of the floating plate track bed 3 through the connecting ear 122 and the fixing bolt 5. The connecting ear 122 is distributed on both sides of the sleeper 31. The floating plate low-height dynamic vibration absorber is arranged along the extension direction of the track.

[0029] In this embodiment, the connecting ears 122 are distributed on both sides of the sleeper 31, so that the sleeper 31 is embedded in the spacing between the connecting ears 122, so that the mass block 11 will have a wider width, so that it can have a smaller thickness under the same quality requirements, thereby reducing the height of the entire system. The waist hole 123 is convenient for adjusting 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 domain range, the mass blocks 11 in the arranged dynamic vibration absorbers 1 can be made of modules of different thicknesses, so that each dynamic vibration absorber 1 has a different natural frequency, thereby making the entire vibration reduction system have vibration absorption frequencies of different frequencies.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. 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 existence of other identical elements in the process, method, article or device including the elements.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A floating plate low height dynamic vibration absorber, characterized in that: The invention comprises a mass block (11), two ends of the mass block (11) are symmetrically arranged first brackets (12), the first bracket (12) comprises a fixing portion and a supporting portion which are perpendicular to each other, a rubber layer (13) is fixedly connected between the supporting portion and the two ends of the mass block (11), and a distance S is formed between the bottom surface of the mass block (11) and the bottom surface of the fixing portion.

2. The floating plate low height dynamic vibration absorber according to claim 1, characterized in that: A second bracket (14) is also provided at one end of the rubber layer (13) and the mass block (11); one side of the second bracket (14) is detachably connected to the mass block (11) and the other side is fixedly connected to the rubber layer (13).

3. The floating plate low height dynamic vibration absorber according to claim 2, characterized in that: One side of the second bracket (14) and the mass block (11) are overlapped via a step, and one end of the mass block (11) is fixed to the step surface of the second bracket (14) via a bolt.

4. The floating plate low height dynamic vibration absorber according to claim 3, characterized in that: The connection surface between the first bracket (12) and the rubber layer (13) and / or the connection surface between the second bracket (14) and the rubber layer (13) are arranged at an angle.

5. The floating plate low height dynamic vibration absorber according to claim 3, characterized in that: The supporting portion of the first bracket (12) is an L-shaped first plate-like component (121), the second bracket (14) is a second plate-like component (141) with two ends bent in opposite directions, the first plate-like component (121) and the second plate-like component (141) are engaged with buckles, and the rubber layer (13) is connected between the first plate-like component (121) and the second plate-like component (141).

6. The floating plate low height dynamic vibration absorber according to claim 5, characterized in that: The two ends of the rubber layer (13) are arranged obliquely.

7. The floating plate low height dynamic vibration absorber according to claim 1, characterized in that: The rubber layer (13) is composed of a plurality of rubber blocks (131) arranged at intervals.

8. The floating plate low height dynamic vibration absorber according to claim 7, characterized in that: The top of the rubber block (131) is connected via a rubber crossbeam (132) extending along the width direction of the mass block (11).

9. The floating plate low height dynamic vibration absorber according to claim 2, characterized in that: The mass block (11), the first bracket (12), and the second bracket (14) are made of metal, and the rubber layer (13) and the first bracket (12) and the second bracket (14) are connected by vulcanization.

10. A floating slab track vibration reduction system, comprising a track foundation (2), a floating slab track bed (3), a vibration isolator (4) and a fastener (6), characterized in that: It also includes a floating plate low-height dynamic vibration absorber (1) as described in any one of claims 1 to 9, wherein the fixing portion of the first bracket (12) is a connecting ear (122), and a waist hole (123) is provided on the connecting ear. The mass block (11) of the floating plate low-height dynamic vibration absorber (1) is connected to the upper surface of the floating plate track bed (3) through the connecting ear (122) and the fixing bolts (5), and the connecting ears (122) are distributed on both sides of the sleepers (31). The floating plate low-height dynamic vibration absorber is arranged along the extension direction of the track.

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