CN220930034U - Vibration isolation device of high-speed railway floor - Google Patents

Abstract

The utility model provides a vibration isolation device of a high-speed railway floor, which comprises a first fixing piece, a second fixing piece and a vibration isolation piece; the high-speed rail comprises a frame and a floor arranged on the frame; the first fixing piece is fixedly connected to the end face of the floor, which faces the ground; the second fixing piece is fixedly connected to the frame; the vibration isolation piece is arranged between the first fixing piece and the second fixing piece and connected with the first fixing piece and the second fixing piece, the vibration isolation piece is made of a metamaterial, and the vibration isolation piece is formed into a metamaterial structure by periodically arranging metamaterial unit cells in the horizontal direction and the plumb line direction; the vibration isolation piece adopts high modulus polyurethane material as the substrate, and the vibration isolation piece is inside to be formed by a plurality of unit cell array structures, and each unit cell is inside to have the through hole and adjacent unit cell encloses into the through hole to reduce the macroscopic modulus of vibration isolation piece, make the vibration isolation piece have low rigidity and low natural frequency's characteristic in comparison with traditional rubber vibration isolator, can satisfy the vibration isolation demand of high-speed railway further acceleration.

Description

Vibration isolation device of high-speed railway floor

Technical Field

The utility model relates to the technical field of vibration isolators, in particular to a vibration isolator for a high-speed rail floor.

Background

Vibration and noise are one of the key factors influencing the highest speed per hour and the comfort inside the carriage of the high-speed train, and the high-speed train is in periodic rolling contact between wheels and rails in the running process, so that vibration is generated and transmitted to the inside of the carriage through the frame. The vibration isolator is used as a vibration isolation device commonly used in engineering and is arranged between vibration isolated equipment and a base. Vibration isolators are arranged between the floor and the frame in the carriage of the high-speed railway train, so that vibration transmitted to the floor by the frame is effectively reduced or even isolated, comfort of passengers in the carriage and running stability of the vehicle are improved, and the purposes of vibration reduction and noise reduction are achieved.

Most of the traditional vibration isolators widely used in engineering are rubber and springs, and rubber vibration isolators are usually used for isolating vibration of the frame and the floor inside the carriage by high-speed rail running at present. The static rigidity of the traditional rubber vibration isolator is about 1400N/mm, the natural frequency is about 37Hz, the rigidity is high, the natural frequency is high, and the elastic modulus is also high. Along with the increasing speed of the new generation of high-speed rails, the vibration of the high-speed rail frame is also more and more severe, and the vibration acceleration transmitted to the floor of the high-speed rail carriage is also more and more great, so that the rubber vibration isolator can not meet the vibration isolation requirement of the high-speed rail floor, and the rigidity and the natural frequency of the vibration isolator are required to be reduced, so that the vibration isolation effect can be further improved. The mechanical property and environmental adaptability of the traditional rubber vibration isolator are determined by the material formula, if the rigidity and the natural frequency of the traditional rubber vibration isolator are reduced, a new rubber material formula with lower elastic modulus needs to be researched again to give consideration to the excellent mechanical property and environmental adaptability, so that the research difficulty and the cost are very high.

Chinese patent CN112049885A discloses a nonlinear metamaterial vibration isolator with quasi-zero stiffness, wherein the quasi-zero stiffness vibration isolation technology is a novel vibration isolation technology, the quasi-zero stiffness is realized by a mode of parallel connection of positive and negative stiffness, the quasi-zero stiffness vibration isolation technology is made of metamaterial, and a plurality of researchers design and manufacture various quasi-zero stiffness vibration isolation mechanisms according to various parallel structures of positive and negative stiffness at present, so that excellent vibration isolation effect is achieved. However, the quasi-zero stiffness mechanism of the metamaterial is only used for vibration isolation and noise reduction of underwater vehicles at present, and the fact that the quasi-zero stiffness mechanism is used for manufacturing a high-speed railway carriage is not yet studied.

Equipment such as a passenger seat and the like and passengers are required to be installed on the high-speed railway floor, so that the weight required to be borne by the floor is extremely heavy, and the condition of uneven stress on the floor is often caused; at present, a high-speed railway floor is usually arranged on a vehicle frame through a rubber vibration isolator, so that in order to meet the bearing requirement of the floor, the rigidity of the traditional rubber vibration isolator is high, and the natural frequency is high, so that the rubber vibration isolator is difficult to carry out high-efficiency vibration isolation on low-frequency vibration generated during the running of the high-speed railway. Therefore, how to use the metamaterial vibration isolation design method to manufacture the low-rigidity vibration isolation device for the high-speed rail floor becomes a problem to be solved urgently by technicians.

Disclosure of utility model

In view of the above, the utility model provides a vibration isolation device for a high-speed railway floor, which is used for solving the problem that when a traditional rubber vibration isolator is used for vibration isolation of the high-speed railway floor, the rigidity and the natural frequency of the traditional rubber vibration isolator are higher, so that the vibration isolation requirement of the floor after the high-speed railway is improved is not met.

The technical scheme of the utility model is realized as follows: the utility model provides a vibration isolation device of a high-speed railway floor, which comprises a first fixing piece, a second fixing piece and a vibration isolation piece; the high-speed rail comprises a frame and a floor arranged on the frame; the first fixing piece is fixedly connected to the end face of the floor, which faces the ground; the second fixing piece is fixedly connected to the frame; the vibration isolation piece is arranged between the first fixing piece and the second fixing piece and is connected with the first fixing piece and the second fixing piece, the vibration isolation piece is made of a metamaterial, and the vibration isolation piece is formed into a metamaterial structure by periodically arranging metamaterial unit cells in the horizontal direction and the plumb line direction.

On the basis of the technical scheme, preferably, at least one cell hole is formed in each metamaterial unit cell, and the radial section shape of each cell hole is polygonal or elliptical.

Still more preferably, the plurality of cells in the vibration damping member are arranged in at least two rows in the plumb line direction, and the cells in adjacent two rows are alternately arranged.

Still more preferably, both ends of the cell hole extend in a direction perpendicular to the extending direction of the vibration insulating member and penetrate the side surface of the vibration insulating member.

On the basis of the technical scheme, preferably, the vibration isolation piece is connected with the first fixing piece or the second fixing piece in an adhesive mode or a pouring vulcanization mode.

Still more preferably, the end face of the first fixing piece or the second fixing piece, which is contacted with the vibration isolation piece, is provided with a groove, the vibration isolation piece is arranged in the groove, and the contact surface of the vibration isolation piece and the inner wall of the groove is connected in an adhesive mode.

Still more preferably, the end face of the vibration isolation member, which is in contact with the first fixing member or the second fixing member, is provided with an embedded member, which is disposed in the embedded groove and is matched with the embedded groove, and the surface of the embedded member, which is in contact with the embedded groove, and the surface of the vibration isolation member, which is in contact with the first fixing member or the second fixing member, are connected by casting and vulcanizing.

Still further preferably, the width of the vibration isolator is smaller than the width of the second mount.

On the basis of the technical scheme, preferably, a through groove is formed in the first fixing piece along the axial direction.

On the basis of the technical scheme, the floor is preferably formed by splicing a plurality of battens, and the vibration isolation devices are arranged at the two end parts and the middle part of the battens.

Compared with the prior art, the vibration isolation device of the high-speed railway floor has the following beneficial effects:

(1) The vibration isolator adopts the high-modulus polyurethane material as the base material, the inside of the vibration isolator is composed of a plurality of unit cell array structures, each unit cell is internally provided with a through hole, and adjacent unit cells are surrounded to form the through hole, so that the macroscopic modulus of the vibration isolator is reduced, the vibration isolator has the characteristics of low rigidity and low natural frequency compared with the traditional rubber vibration isolator, and the vibration isolator manufactured by the metamaterial vibration isolator design method can replace the traditional rubber vibration isolator, and can meet the vibration isolator requirement of further accelerating a high-speed rail.

(2) According to the utility model, the fixing piece and the vibration isolation piece are matched through the embedded piece to realize connection and pouring vulcanization treatment, so that after the metamaterial vibration isolation piece is vulcanized and formed between the two fixing pieces, the fixing piece and the metamaterial vibration isolation piece are assembled more tightly, the connection strength between the fixing piece and the metamaterial vibration isolation piece is improved, so that the vibration isolation device can bear larger tensile load, and the safety and reliability of the vibration isolation device in the running process of a high-speed rail are ensured.

(3) According to the utility model, the vibration isolation piece is connected with the fixing piece in a casting vulcanization mode, and the width of the second fixing piece is larger than that of the vibration isolation piece, so that a sufficient assembly gap is reserved between the second fixing piece and the casting mold, the material leakage phenomenon is avoided in the casting process, and the casting vulcanization forming quality is improved, and tight assembly can be realized.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a vibration isolation apparatus of the present utility model;

fig. 2 is a perspective view of the vibration isolation apparatus of the present utility model;

fig. 3 is a front view of the vibration isolation apparatus of the present utility model;

fig. 4 is a side view of the vibration isolation apparatus of the present utility model.

In the figure: 1. a first fixing member; 11. an insert; 101. a groove; 102. a caulking groove; 103. a through groove; 2. a second fixing member; 3. vibration isolation members; 31. metamaterial unit cell; 301. and (5) cell holes.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1, the vibration isolation device of the high-speed railway floor comprises a first fixing piece 1, a second fixing piece 2 and a vibration isolation piece 3.

Wherein, the high-speed railway includes the frame and installs the floor on the frame. The frame refers to a carriage bottom frame and is one of main frame structures forming a high-speed railway carriage. The floor is usually welded into a whole floor after being spliced by a plurality of battens, a vibration isolator is arranged on a frame, and the floor is arranged on the top of the vibration isolator, so that vibration of the floor along the plumb line direction is isolated.

The first fixing piece 1 is fixedly connected to the end face of the floor, facing the ground, and is manufactured by adopting a machining method through 6063-T5 aluminum alloy materials, and is subjected to surface hard anodic oxidation treatment, wherein the thickness of an oxide film is not less than 20 mu m, so that the corrosion resistance of the floor is improved. The first fixing piece 1 can be provided with M8 threaded holes at four corners and is in threaded connection with the bottom surface of the floor through the threaded holes; the width of the first fixing member 1 is larger than the width of the second fixing member 2. A gasket is usually arranged between the first fixing piece 1 and the floor, the gasket is made of MUC polyurethane material and is bonded by polyurethane-metal glue, the gasket has the function of isolating and buffering in the middle of the two, and the direct contact between the floor of the carriage and the first fixing piece 1 is avoided, so that metal collision friction noise is prevented.

The second fixing piece 2 is fixedly connected to the frame; the processing and manufacturing method and the surface treatment process are the same as those of the first fixing piece 1. The second fixing piece 2 is longer than the first fixing piece 1, and M8 threaded holes are formed in two ends of the second fixing piece and are connected with the frame through the threaded holes in a threaded mode. The second fixing member 2 has a smaller width at both ends than the middle width, which is designed to accommodate the mounting interface of the high-speed railway carriage frame, and the middle width is designed to accommodate the width of the vibration insulating member 3.

The vibration isolation member 3 is arranged between the first fixing member 1 and the second fixing member 2 and connected with the first fixing member 1 and the second fixing member 2, the vibration isolation member 3 is made of a metamaterial, and specifically, a MUC polyurethane material is adopted as a base material. The vibration isolator 3 is formed by periodically arranging metamaterial unit cells 31 in the horizontal direction and the plumb line direction. The metamaterial structure made of MUC polyurethane material is used for replacing the traditional rubber material vibration isolator, and has at least two advantages, namely the static rigidity of the metamaterial vibration isolator 3 is low and is not higher than 1400N/mm generally, 300N/mm and the natural frequency is 17Hz, the vibration isolation effect is improved by about 6dB in a 50Hz-315Hz frequency band, and is improved by about 9dB in a 400Hz-1kHz frequency band, so that the vibration isolator is far superior to the rubber vibration isolator, and the vibration isolator can meet the vibration isolation requirement of further accelerating high-speed rail; secondly, when the rubber vibration isolator is adopted to isolate the floor, in order to meet higher vibration isolation requirements under the condition that the rubber material is unchanged, the volume and the occupied area of the rubber vibration isolator are required to be greatly increased, and the rubber vibration isolator has higher elastic modulus, so that vibration on the floor is difficult to isolate, and the elastic modulus of the metamaterial vibration isolator 3 is smaller, so that vibration isolation in the transverse direction and the vertical direction can be simultaneously realized, and meanwhile, the elastic modulus of the metamaterial vibration isolator 3 is changed by changing the size of the cell holes 301 in the metamaterial unit cell 31, so that the metamaterial vibration isolator 3 can adapt to different vibration isolation conditions by adopting the same volume and occupied area.

In a preferred embodiment shown in fig. 3, at least one cell 301 is formed in the metamaterial unit cell 31, and the elastic modulus of the metamaterial structure of the vibration isolation member 3 can be realized by changing the size of the cell 301 in the metamaterial unit cell 31; the radial cross-sectional shape of the cell 301 is polygonal or elliptical; the polygons are usually triangles, rectangles, pentagons and hexagons, and the corners of the polygons are rounded; the oval shape is generally oblong, circular or arc-shaped; and in theory, the cells 301 may also be irregularly shaped. In addition, the two sides of each metamaterial unit cell 31 are actually opened, so that two adjacent metamaterial unit cells 31 are connected and then form a cell hole 301. Specifically, in this embodiment, the inside of the metamaterial unit cell 31 is provided with three types of unit cell through holes along the transverse direction: the basic shape of the first one is an obtuse triangle, the number of the first one is six and the first one is divided into an upper group and a lower group, the upper group and the lower group are respectively an obtuse triangle which is arranged right and an obtuse triangle which is inverted, and the two acute angles of the obtuse triangle are rounded with the radius of 2.4 mm; the second basic shape is a diamond, the number of the second basic shapes is two, and the two acute angles of the diamond are rounded with the radius of 2.4 mm; and three are side opening shapes, the number of which is two, which separate the upper and lower parts of the edge of the metamaterial unit cell 31, and the bevel edge size of the metamaterial unit cell is consistent with that of the diamond-shaped edge.

In a preferred embodiment shown in fig. 1, the cells 301 in the vibration isolation member 3 are arranged in at least two rows in the plumb line direction, and the cells 301 in adjacent two rows are alternately arranged. Specifically, in this embodiment, the inside of the metamaterial unit cell 31 is provided with three types of unit cell through holes along the transverse direction: the basic shape of the first one is an inverted triangle, the number of the first one is three, and two acute angles of the inverted triangle are subjected to rounding treatment with the radius of 2.4 mm; the second base shape is an obtuse triangle, the number of the right triangle and the obtuse triangle is four, and two acute angles of the right triangle and the obtuse triangle are rounded with a radius of 2.4 mm; and the third is the shape of side opening, the number of which is two, the upper and lower parts of the edge of the metamaterial unit cell 31 are separated, and the hypotenuse size is consistent with the length of the hypotenuse of the triangle.

In a preferred embodiment shown in fig. 3, the two ends of the cell 301 extend in a direction perpendicular to the extending direction of the vibration isolation member 3 and penetrate the side surface of the vibration isolation member 3, so that the vibration isolation member 3 can be greatly reduced in weight.

In a preferred embodiment shown in fig. 1, in combination with fig. 2, the vibration insulating member 3 is connected to the first mount 1 or the second mount 2 by means of bonding or by means of cast vulcanization.

In a preferred embodiment shown in fig. 4, when the vibration isolation member 3 is connected to the first fixing member 1 or the second fixing member 2 by bonding, a groove 101 is formed on the end surface of the first fixing member 1 or the second fixing member 2 contacting with the vibration isolation member 3, the vibration isolation member 3 is disposed in the groove 101, and the contact surface between the vibration isolation member 3 and the inner wall of the groove 101 is connected by bonding. Specifically, the depth of the groove 101 is 2mm, the inner wall surface of the groove 101 is subjected to 80-100 mesh sand blasting, metal-polyurethane glue with the thickness of 0.5mm is smeared on the inner wall surface of the groove 101, and the vibration isolation piece 3 and the groove 101 are rapidly aligned and folded for tight adhesion, so that the assembly between the fixing piece and the vibration isolation piece 3 is realized.

In a preferred embodiment shown in fig. 2, an insert groove 102 is formed in an end surface of the vibration isolation member 3 contacting the first fixing member 1 or the second fixing member 2, an insert member 11 is disposed on an end surface of the first fixing member 1 or the second fixing member 2 contacting the vibration isolation member 3, the insert member 11 is disposed in the insert groove 102 and cooperates with the insert groove 102, and a surface of the insert member 11 contacting the insert groove 102 and a surface of the vibration isolation member 3 contacting the first fixing member 1 or the second fixing member 2 are connected by casting vulcanization. The cross-sectional shapes of the insert 11 and the caulking groove 102 may be J-shaped, L-shaped or inverted T-shaped. Specifically, the insert 11 is poured through a mold, metal-polyurethane vulcanization adhesives are brushed on two side surfaces of the insert 11, a mold release agent is sprayed on the side surfaces of the mold, polyurethane pouring is performed, and after the polyurethane metamaterial vibration isolation piece 3 is cured and formed, demolding treatment is performed. It is also usual to carry out a sand blast treatment in the vulcanization area of the first fixing member 1 and the second fixing member 2 to enhance the vulcanization adhesion strength thereof.

In a preferred embodiment shown in fig. 2, the width of the vibration isolation member 3 is smaller than that of the second fixing member 2, so that a sufficient assembly gap is left between the second fixing member 2 and the mold, tight assembly is realized, material leakage in the casting process is avoided, and the casting vulcanization forming quality is improved.

In a preferred embodiment shown in fig. 4, a through groove 103 is formed in the first fixing member 1 along the axial direction, and four corners of a radial section of the through groove 103 are rounded; the through groove 103 formed in the first fixing member 1 has an effect of reducing the weight and stress concentration of the first fixing member 1.

In a preferred embodiment shown in fig. 4, the floor is formed by splicing a plurality of slats, and vibration isolation devices are provided at both end portions and at the middle portion of the slats, so that the vibration isolation devices using the metamaterial structure require a smaller space and have a lighter weight than the conventional rubber vibration isolator.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a vibration isolation device of high-speed railway floor which characterized in that: comprises a first fixing piece (1), a second fixing piece (2) and a vibration isolation piece (3);

The high-speed rail comprises a frame and a floor arranged on the frame;

The first fixing piece (1) is fixedly connected to the end face of the floor, which faces the ground;

the second fixing piece (2) is fixedly connected to the frame;

The vibration isolation piece (3) is arranged between the first fixing piece (1) and the second fixing piece (2) and is connected with the first fixing piece (1) and the second fixing piece (2), the vibration isolation piece (3) is made of a metamaterial, and the vibration isolation piece (3) is formed into a metamaterial structure by periodically arranging metamaterial single cells (31) in the horizontal direction and the plumb line direction.

2. The vibration isolation device of a high-speed railway floor according to claim 1, wherein: at least one cell hole (301) is formed in the metamaterial unit cell (31), and the radial section of the cell hole (301) is polygonal or elliptical.

3. The vibration isolation device of the high-speed railway floor according to claim 2, wherein: the plurality of cells (301) in the vibration isolation member (3) are distributed in at least two rows along the plumb line direction, and the cells (301) of two adjacent rows are alternately distributed.

4. The vibration isolation device of the high-speed railway floor according to claim 2, wherein: the two ends of the cell hole (301) extend along the direction perpendicular to the extending direction of the vibration isolation piece (3) and penetrate through the side face of the vibration isolation piece (3).

5. The vibration isolation device of a high-speed railway floor according to claim 1, wherein: the vibration isolation piece (3) is connected with the first fixing piece (1) or the second fixing piece (2) in an adhesive mode or a pouring vulcanization mode.

6. The vibration isolation device of the high-speed railway floor according to claim 5, wherein: the vibration isolator is characterized in that a groove (101) is formed in the end face, which is in contact with the vibration isolator (3), of the first fixing piece (1) or the second fixing piece (2), the vibration isolator (3) is arranged in the groove (101), and the contact surface of the vibration isolator (3) and the inner wall of the groove (101) is connected in an adhesive mode.

7. The vibration isolation device of the high-speed railway floor according to claim 5, wherein: the vibration isolation piece (3) is provided with an embedded groove (102) on the end face contacted with the first fixing piece (1) or the second fixing piece (2), the first fixing piece (1) or the second fixing piece (2) is provided with an embedded piece (11) on the end face contacted with the vibration isolation piece (3), the embedded piece (11) is arranged in the embedded groove (102) and matched with the embedded groove (102), and the surface contacted with the embedded groove (102) of the embedded piece (11) and the surface contacted with the first fixing piece (1) or the second fixing piece (2) are connected through a pouring vulcanization mode.

8. The vibration isolation device of a high-speed railway floor according to claim 7, wherein: the width of the vibration isolation piece (3) is smaller than that of the second fixing piece (2).

9. The vibration isolation device of a high-speed railway floor according to claim 1, wherein: a through groove (103) is formed in the first fixing piece (1) along the axial direction.

10. The vibration isolation device of a high-speed railway floor according to claim 1, wherein: the floor is formed by splicing a plurality of battens, and the vibration isolation devices are arranged at the two end parts and the middle part of the battens.