Microporous structure vibration isolation pad for rail transit

Abstract

The utility model provides a micro-pore structure vibration isolation pad for rail transit, which is characterized by comprising a plate-shaped body part, a plurality of micro-pore structures and a plurality of vibration isolation pads, the body part is arranged on the base, the plurality of protruding parts are distributed on the surface of one side of the body part, the body part and the protruding parts are made of microporous rubber, the shape of each protruding part is any one or a combination of several of a hemisphere, a cylinder, a cone and an ellipsoid, and the thickness of each protruding part is 5mm-35mm. Compared with a solid vibration isolation pad with protrusions in the prior art, the vibration isolation pad has the advantages that the static rigidity is lower, the specific gravity is small, the rigidity is lower, the high-frequency dynamic rigidity is stable, and the vibration isolation pad is more suitable for being used as a rail transit vibration isolation pad.

Description

Technical Field

[0001] The utility model belongs to the field of rail transportation, and in particular relates to a vibration isolation pad with a microporous structure used for rail transportation. Background Art

[0002] In the field of rail transit, vibration isolation pads are usually made of elastic materials such as rubber, and are used to be laid under rail fasteners or on the roadbed to reduce vibration and noise during vehicle operation.

[0003] Disadvantages of existing technologies: The solid rubber vibration isolation pad with a raised structure is used to reduce the rigidity of the product, the product has a high specific gravity, is inconvenient to install, and has a large thickness; the microporous polymer vibration isolation pad is a flat plate as a whole, and deformation is generated through the gaps between the bubbles to achieve the vibration reduction requirements. This type of product has defects such as large changes in high-frequency dynamic stiffness, low tensile strength, high water absorption, and poor puncture resistance. Utility Model Content

[0004] Based on the above problems, the utility model provides a microporous structure vibration isolation pad for rail transit, characterized in that it includes: a main body portion, which is in the shape of a plate; and a plurality of raised portions, which are distributed on one side surface of the main body portion, wherein the main body portion and the raised portions are composed of microporous rubber, and the shape of the raised portion is any one or a combination of several of a hemisphere, a cylinder, a cone, and an ellipsoid, and the thickness of the raised portion is 5mm-35mm.

[0005] The microporous structure vibration isolation pad for rail transit provided by the utility model can also have such technical features, wherein the column includes a cylinder and a prism, and the cone includes a cone, a truncated cone, or a polygonal truncated cone.

[0006] The microporous structure vibration isolation pad for rail transit provided by the utility model can also have such a technical feature, wherein the thickness of the main body is 5mm-35mm.

[0007] In addition, the microporous structure vibration isolation pad for rail transit provided by the utility model can also have such technical characteristics, wherein the bottom diameter of the protrusion is 5mm-30mm, the top diameter is 3mm-8mm, and the spacing between the bottom centers of adjacent protrusions is 12mm-50mm.

[0008] In addition, the microporous structure vibration isolation pad for rail transit provided by the utility model may also have such technical features, and further include: a solid layer, which is arranged on the other side surface of the main body.

[0009] Furthermore, the above-mentioned microporous structure vibration isolation pad for rail transit may also have such a technical feature, wherein the solid layer is a solid rubber layer.

[0010] Furthermore, the above-mentioned microporous structure vibration isolation pad for rail transit may also have such a technical feature, wherein the solid layer and the main body are formed together.

[0011] Function and effect of utility model

[0012] According to the microporous structure vibration isolation pad for rail transit provided by the utility model, since it includes a main body and a plurality of protrusions distributed on the surface of one side of the main body, compared with the solid vibration isolation pad with protrusions in the prior art, the vibration isolation pad of the utility model achieves lower static stiffness while having a smaller specific gravity, and has the advantages of lower stiffness and stable high-frequency dynamic stiffness, and is more suitable for application as a vibration isolation pad for rail transit.

[0013] Furthermore, the vibration isolation pad of the utility model also has the advantage of lower water absorption, and thus can extend the service life in the field environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a microporous vibration isolation pad for rail transit according to Example 1 of the utility model.

[0015] Figure 2 This is a structural diagram of a multi-layer microporous structure vibration isolation pad for rail transit in Example 2 of the utility model. DETAILED DESCRIPTION

[0016] The following examples illustrate the microporous vibration isolation pad for rail transit and its preparation method. In the following examples, the reagents and materials whose sources are not specified are all commercially available, and the operation methods without specific processes are referred to the conventional operation methods in the prior art.

[0017] <Example 1>

[0018] Figure 1 It is a structural diagram of a microporous vibration isolation pad for rail transit according to Example 1 of the utility model.

[0019] like Figure 1 As shown, this embodiment provides a microporous structure vibration isolation pad for rail transit with protrusions (hereinafter referred to as a protruding microporous vibration isolation pad) 100 , and the protruding microporous vibration isolation pad 100 includes a main body 10 and a plurality of protrusions 20 .

[0020] The main body 10 and the raised parts 20 are both made of microporous rubber, and the main body 10 and each raised part 20 are formed integrally. The main body 10 is in the shape of a flat plate with a thickness of 8 mm; the raised parts 20 are formed on one surface of the main body 10 with a thickness of 20 mm. In addition, in this embodiment, the raised parts 20 are all in the shape of a truncated cone with a bottom diameter of 20 mm and a top diameter of 5 mm. The raised parts 20 are evenly distributed in a longitudinal and transverse alignment, and the spacing between the bottom centers of adjacent raised parts 20 is 30 mm.

[0021] The above-mentioned raised microporous vibration isolation pad 100 of this embodiment is prepared by a rubber vulcanization method, and the material components used are microporous rubber components in the prior art, as shown in the following table:

[0022]

[0023] The specific preparation process includes the following steps:

[0024] Step S1, rubber material internal mixing: the raw rubber is mixed with small materials, fillers, plasticizers, microporous structure additives, and vulcanization systems in an internal mixer to obtain mixed rubber. The specific operation process is: the raw rubber and small materials are placed in an internal mixer for mixing for 2-4 minutes, and then the fillers and plasticizers are added for mixing. When the temperature rises to 135°C, the mixing is continued for 2-4 minutes, and the temperature reaches 150°C for rubber discharge to obtain a first-stage rubber; when the first-stage rubber is cooled to below 50°C, the first-stage rubber and the vulcanization system, foaming agent, and foaming aid are mixed in an internal mixer, and the temperature reaches 95°C for rubber discharge to obtain a second-stage rubber, which is the mixed rubber.

[0025] Step S2, preforming the rubber mix: the rubber mix obtained in step S1 is calendered on a four-roll calender to form a preformed rubber sheet with a thickness of about 4 mm.

[0026] Step S3, pressing and vulcanizing: the preformed film obtained in step S2 is cut into a predetermined size, and then formed and vulcanized using a flat vulcanizing machine. The specific operation is: the cut preformed film is placed in a mold and pressed tightly, and vulcanized according to the vulcanization parameters of temperature 155°C, 9MPa, and 20min to obtain the raised microporous vibration isolation pad 100.

[0027] In the flat plate mold used in the above step S3, one surface is flat and the other surface has a truncated cone-shaped hole. The shape, size and distribution of the truncated cone-shaped hole are consistent with the protrusion 20, that is, the bottom diameter of the truncated cone-shaped hole is 15 mm, the top diameter is 5 mm, and the spacing between the bottom centers of adjacent truncated cone-shaped holes is 6.4 mm, and the height is 8 mm. Therefore, after pressing and vulcanization, due to the action of the microporous structure additive, the colloid forms micropores and expands in volume, filling the truncated cone-shaped holes in the mold, thereby forming the protrusion 20.

[0028] <Modification>

[0029] This variation is a variation of Example 1.

[0030] Compared with the first embodiment, the present modification example is different in the size parameters of the protrusion 20. Specifically, the protrusion 20 of the present modification example has a bottom diameter of 20 mm, a top diameter of 4 mm, and a height of 7 mm.

[0031] <Example 2>

[0032] Figure 2 This is a structural diagram of a multi-layer microporous structure vibration isolation pad for rail transit in Example 2 of the utility model.

[0033] like Figure 2 As shown, this embodiment provides a multi-layer raised microporous vibration isolation pad 200, which includes a raised microporous vibration isolation pad 100 and a solid layer 30, wherein the raised microporous vibration isolation pad 100 is made of microporous rubber, and the solid layer 30 is made of a solid rubber layer.

[0034] In this embodiment, the composition of the raised microporous vibration isolation pad 100 is consistent with that in Embodiment 1, and the composition of the solid rubber layer is substantially the same as that of the raised microporous vibration isolation pad 100, except that no microporous structure additive is added to the solid rubber layer.

[0035] The preparation process of the multi-layer raised microporous vibration isolation pad 200 of this embodiment includes the following steps:

[0036] Step S1, rubber compound internal mixing: mixing raw rubber with small materials, filler, plasticizer, microporous structure additive, and vulcanization system in an internal mixer to obtain a mixed rubber, and mixing raw rubber with small materials, filler, and plasticizer vulcanization system in an internal mixer to obtain a solid mixed rubber. The conditions and parameters of the two parts of internal mixing are the same as those in Example 1.

[0037] Step S2, preforming of the rubber mix: the rubber mix obtained in step S1 is calendered on a four-roll calender to form a preformed film with a thickness of about 5 mm, and the solid rubber mix obtained in step S1 is calendered on a four-roll calender to form a solid preformed film with a thickness of about 3 mm.

[0038] Step S3, pressing and vulcanization: the preformed film and the solid preformed film obtained in step S2 are cut into predetermined sizes respectively, and then co-molded and co-vulcanized using a flat vulcanizer. The specific operation is: stack the cut preformed film and the solid preformed film in a mold, wherein the preformed film faces the mold with a truncated cone hole, and the solid preformed film faces the flat mold, close the mold for pressing (pressurization 3MPa, duration 3min), and then vulcanize according to the vulcanization parameters of temperature 155°C, 9MPa, and 20min, to obtain.

[0039] <Comparative Example>

[0040] This comparative example provides a flat microporous rubber pad, which differs from Example 1 in that it does not have the protrusion 20 .

[0041] The composition of the flat microporous rubber pad in this comparative example is exactly the same as that in Example 1, and the preparation process is basically the same as that in Example 1, except that the pressing and vulcanization mold in step S3 is replaced by an ordinary flat mold, and the final product is a flat microporous rubber pad with a thickness of 10 mm.

[0042] <Test example>

[0043] This test example is a performance test of the raised microporous vibration isolation pad 100 and the multi-layer raised microporous vibration isolation pad of each embodiment and modified example and the flat microporous rubber pad of comparative example 1, including tensile strength, elongation at break, tensile strength after aging, elongation at break after aging, tensile strength after water resistance, elongation at break after water resistance, water absorption and dynamic stiffness. Among them, except for dynamic stiffness, various performance tests are carried out with reference to the methods described in GB / T 39705 or GB / T38695, among which the test method of dynamic stiffness is carried out with reference to the dynamic foundation modulus test method in Appendix B of GB / T 39705, which will not be repeated here.

[0044] The specific test results are shown in the following table:

[0045]

[0046]

[0047] As shown in the above table, compared with comparative example 1, the raised microporous vibration isolation pad 100 of example 1 has higher tensile strength and water resistance, and is suitable for use as a rail transit vibration isolation pad.

[0048] Furthermore, the raised microporous vibration isolation pad 100 of Example 1 has lower stiffness, and the change of dynamic stiffness with increasing frequency is low, which has the advantage of stable high-frequency dynamic stiffness.

[0049] In addition, the water absorption of the raised microporous vibration isolation pad 100 of Example 1 is lower, which may be because the micropores in Example 1 are mainly closed holes. Therefore, in the field environment, rainwater is not easy to enter and accumulate inside the vibration isolation pad, which can slow down the aging of rubber and extend the service life. In addition, compared with traditional rubber vibration isolation pads, the raised microporous vibration isolation pad 100 of Example 1 also achieves a lower static stiffness and a smaller specific gravity.

[0050] In addition, compared with Example 1, one side of the raised microporous vibration isolation pad 100 in Example 2 has a solid layer. Therefore, on the one hand, the overall thickness can be adjusted through the solid layer, and it can be adapted to occasions of different thickness sizes when replaced. On the other hand, the solid layer can also improve the overall puncture resistance and further improve durability.

[0051] After testing, in the present invention, by changing the size parameters of the vibration isolation pad, vibration isolation pad products with different static moduli can be obtained. Among them, low static modulus products are used in ordinary subway sections, and the line train speed is 80km / h-120km / h; medium static modulus products are used in the transition section of the subway line to avoid excessive impact on the track due to different line vibration reduction effects during train driving; high static modulus products are used in high-speed railway sections, and the line train speed is greater than 250km / h.

[0052] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0053] Among them, in the raised microporous vibration isolation pad 100 of Example 1, the thickness of the main body 10 is 8mm, but in the present invention, the thickness can be any thickness in the range of 5mm-35mm; the thickness of the raised portion 20 is 20mm, but in the present invention, the thickness can also be any thickness in the range of 5mm-35mm. In addition, the bottom diameter of the raised portion 20 is 20mm, the top diameter is 5mm, and the spacing between the bottom centers of adjacent raised portions 20 is 30mm, but these dimensional parameters can also select other values ​​within an appropriate range, for example, the bottom diameter of the raised portion 20 ranges from 5mm-30mm, the top diameter is 3mm-8mm, and the spacing between the bottom centers of adjacent raised portions 20 is 12mm-50mm, and so on.

[0054] In each embodiment, the protrusion 20 is in the shape of a truncated cone. As an alternative, the protrusion 20 in the utility model can also be in other shapes, such as a hemisphere, a column (such as a cylinder, a prism), an ellipsoid, or other cone shapes (such as a cone, a triangular cone, a quadrangular cone, etc.), a frustum (such as a triangular frustum, a quadrangular frustum, etc.), etc. Further, two or more of these shapes can be combined to form a structure with protrusions 20 of different shapes distributed on the same surface.

[0055] In addition, the microporous rubber preparation process used in the embodiment, that is, the material composition used and the condition parameters of the preparation process are all referenced to the prior art. As an alternative, other microporous rubber material preparation processes of the prior art can also be used.

Claims

1. A microporous structure vibration isolation pad for rail transit, characterized in that: include: The body part is plate-shaped; as well as A plurality of protrusions are distributed on one side surface of the main body. Wherein, the main body and the raised portion are made of microporous rubber. The shape of the protrusion is any one of a hemisphere, a cylinder, a cone, and an ellipsoid, or a combination of several of them. The thickness of the raised portion is 5 mm-35 mm.

2. The microporous structure vibration isolation pad for rail transit according to claim 1, characterized in that: in, The column includes a cylinder and a prism. The cone includes a cone, a truncated cone, or a polygonal truncated cone.

3. The microporous structure vibration isolation pad for rail transit according to claim 1, characterized in that: in, The thickness of the main body is 5mm-35mm.

4. The microporous structure vibration isolation pad for rail transit according to claim 1, characterized in that: in, The bottom diameter of the protrusion is 5mm-30mm, and the top diameter is 3mm-8mm. The spacing between the bottom center of adjacent protrusions is 12mm-50mm.

5. The microporous structure vibration isolation pad for rail transit according to claim 1, characterized in that: Also includes: The entity layer is arranged on the other side surface of the main body.

6. The microporous structure vibration isolation pad for rail transit according to claim 5, characterized in that: in, The entity layer is a solid rubber layer.

7. The microporous structure vibration isolation pad for rail transit according to claim 5 or 6, characterized in that: in, The entity layer and the main body are formed together.

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