Elastic pads for rail transit

Abstract

An elastic pad for rail transit comprises a base pad, wherein the base pad is made of elastic material foam, and is provided with a plurality of through holes extending vertically therethrough, each through hole being filled with a solid elastic material column, the thickness of the solid elastic material column being 0 to 2 mm thicker than the thickness of the base pad, and columnar protrusions are provided at intervals around the outer contour of the base pad; thereby, the present invention realizes the optimization of the elastic pad manufacturing process from secondary processing to one-time vulcanization foaming molding, so that a crust is formed around the elastic pad to seal the foaming holes, thereby avoiding the problem of waist shrinkage and deformation during cutting and compression, and improving the aesthetics and economy of the elastic pad; the pad can be effectively limited in the assembled state, and sufficient space can be provided for the pad to be deformed under load, thereby ensuring the stability of the system stiffness; ensuring that the gaps from the pad to each installation boundary are equal, so that the pad is at the load center without deformation deviation.

Description

Technical Field

[0001] The invention relates to the technical field of rail vibration-damping fasteners, and in particular to an elastic pad for rail transportation. Background Art

[0002] The present invention is aimed at the existing "split-inlaid combined elastic pad for rail transit fasteners" (201210338993.4) ​​for structural innovation. There are some technical problems in the existing elastic pad structure and manufacturing process, which are mainly reflected in the following aspects:

[0003] First, when the elastic pad is assembled with the nesting ring, if an interference fit is used, there will be insufficient deformation space when the elastic pad is deformed under load, which will make the stiffness of the elastic pad in the assembled state about 5% greater than that in the free state; if a clearance fit is used, the pad is very likely to have a unilateral phenomenon in the nesting ring, and due to the different sizes of the clearances, it is easy to have problems such as poor stiffness stability of the fastener system.

[0004] Second, due to the problem in the first point above, it is usually required that the outline size of the elastic pad should not be too tight or too large when assembled with the nesting ring. In order to meet this requirement, the outline size of the elastic pad is usually guaranteed by secondary punching. This process will cause the foaming holes around the elastic pad to open, and the cut surface is prone to waist shrinkage and deformation during the cutting and compression process.

[0005] Third, the material utilization rate of the secondary processing of the elastic pad is low and the processing cost is high.

[0006] In order to improve the stiffness stability of the fastener system, avoid problems such as the opening of foam holes and deformation of the cross-section of the pad contour, and improve the production efficiency and material utilization of the elastic pad, it is necessary to improve the elastic pad structure and manufacturing process.

[0007] To this end, in view of the above-mentioned defects, the designers of the present invention have concentrated on research and design, combined with the experience and achievements of many years of engaging in related industries, and have researched and designed an elastic pad for rail transit to overcome the above-mentioned defects. Summary of the invention

[0008] The object of the present invention is to provide an elastic pad for rail transit, which realizes the optimization of the manufacturing process of the elastic pad from secondary processing to one-time vulcanization foaming molding, so that a crust is formed around the elastic pad to seal the foaming holes, avoiding the problem of waist shrinkage and deformation during cutting and compression, thereby improving the aesthetics and economy of the elastic pad; the pad can be effectively limited in the assembled state, and sufficient space can be provided for the pad to be deformed under load, thereby ensuring the stability of the system stiffness; the gap between the pad and each installation boundary is guaranteed to be equal, so that the pad is at the load center and no deformation deviation occurs.

[0009] To achieve the above object, the present invention discloses an elastic pad for rail transit, comprising a base pad, characterized in that:

[0010] The base pad is made of foamed elastic material and is provided with a plurality of through holes extending vertically therethrough. Each through hole is filled with a solid elastic material column, which is 0 to 2 mm thicker than the base pad. Columnar protrusions are provided at intervals around the outer contour of the base pad.

[0011] Wherein: the surface of the base pad is formed by embossing, the embossing structure on the pad surface is a wave embossing structure, and the embossing depth is 0.2 to 0.5 mm.

[0012] Wherein: the surface wave pattern of the base pad is configured as a convex pattern or a concave pattern.

[0013] Wherein: the columnar protrusions on the outer contour of the foundation pad are distributed with equal or unequal spacing.

[0014] Wherein: the distance between two adjacent columnar protrusions is 10 to 30 mm.

[0015] Wherein: the columnar protrusion protrudes from the outer contour of the pad by 1 to 3 mm.

[0016] Wherein: the matching clearance between the columnar protrusion and the assembly constraint boundary of the pad is 0 to +2 mm.

[0017] Wherein: the cross section of the columnar protrusion is arc-shaped or polygonal.

[0018] Wherein: the outer contour around the foundation pad is not a straight plane.

[0019] Wherein: the base pad is made of rubber or polyurethane foam, and its interior is a closed-cell foam structure that is overall regular but partially irregular.

[0020] From the above content, it can be known that the elastic pad for rail transit of the present invention has the following effects:

[0021] 1. Semi-cylindrical protrusions are set around the outer contour of the elastic pad. Their function is to limit the pad in the assembled state and maintain the gap between the pad and the installation constraint boundary, providing sufficient space for the elastic pad to deform under load and ensure the stability of the system stiffness.

[0022] 2. The rough wavy patterns on the upper and lower surfaces of the elastic pad increase the friction coefficient of the product, preventing potential safety hazards caused by sliding of the pad product during installation and application.

[0023] 3. The above-mentioned contour convex edge structure enables the elastic pad and the nesting ring to achieve a greater degree of interference fit, and the pad has the conditions for one-time vulcanization and foaming molding, which improves production efficiency and increases the effective utilization rate of materials.

[0024] 4. The implementation of the above-mentioned one-time foaming molding process can form a skin around the sides of the elastic pad, close the foaming pores, avoid deformation and shrinkage of the elastic pad caused by the traditional cutting process, and improve the aesthetics.

[0025] The details of the present invention can be obtained from the following description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An assembly diagram of a vibration-damping fastener used in an elastic pad for rail transit of the present invention is shown;

[0027] Figure 2 A side view of the present invention is shown;

[0028] Figure 3 A top view of the present invention is shown.

[0029] Reference numerals:

[0030] 1: nut cover, 2: flat washer, 3: spring bar, 4: sub-iron pad, 5: No. 10 track gauge block, 6: No. 8 track gauge block, 7: T-bolt, 8: nut, 9: spiral spike, 10: spring washer, 11: rail pad, 12: elastic pad, 13: mother iron pad, 14: buffer inlay sleeve, 15: casing, 16: insulating buffer pad, 12-1: base pad; 12-2: through hole; 12-3: columnar protrusion; 12-4: solid elastic material column. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0032] like Figure 1 As shown, the vibration-damping fastener used for the elastic pad for rail transit of the present invention is shown, wherein the sub-iron pad 4, the elastic pad 12, the buffer inlay sleeve 14 and the mother iron pad 13 are assembled and assembled on the rail through the spring bar 3, the T-bolt 7, the flat washer 2, the nut 8, and the nut cover 1, the rail and the spring bar 3 are directly assembled by the gauge block (which may include the No. 10 gauge block 5 and the No. 8 gauge block 6), and the rail under-pad 11 is assembled between the rail and the sub-iron pad 4; the insulating buffer pad 16 is assembled between the buffer inlay sleeve 14 and the sleeper, and the spiral spike 9 passes through the mother iron pad 13, the spring washer 10, the buffer inlay sleeve 14, the insulating buffer pad 16, and is screwed into the sleeve 15 fixed in the sleeper.

[0033] Among them, the elastic pad 12 is placed between the sub-iron pad and the insulating buffer pad. Since there are assembly parts on the upper and lower parts of the elastic pad, the wavy embossed structure on the surface of the elastic pad can increase the surface friction coefficient of the pad, thereby preventing the vibration-damping fastener from causing safety hazards to the entire vibration-damping fastener due to the sliding of the iron pad or other components during installation and daily use.

[0034] like Figure 2 and Figure 3 As shown, the elastic pad 12 of the present invention includes a base pad 12-1, and the base pad 12-1 is provided with a plurality of through holes 12-2 that pass through from top to bottom, and each through hole 12-2 is filled with a solid elastic material column 12-4, and the thickness of the solid elastic material column 12-4 is 0 to 2 mm thicker than the thickness of the base pad 12-1 (preferably 0.5-1.5 mm thicker). During the actual installation of the vibration-damping fastener, the pad is affected by the preload and will deform when not loaded. At this time, since the solid elastic material column 12-4 is higher than the base pad 12-1, the solid elastic material column 12-4 is preferentially subjected to the force and deformed, and the base pad 12-1 is not subjected to the load and does not deform. When the vibration-damping fastener is loaded, the base pad 12-1 is loaded and deformed together with the solid elastic material column 12-4, providing overall stiffness.

[0035] like Figure 3 As shown, the outer contour of the base pad 12-1 is surrounded by semi-cylindrical columnar protrusions 12-3, whose functions are: to optimize the manufacturing process of the elastic pad from secondary processing to one-time vulcanization foaming molding, so that a skin is formed around the elastic pad to seal the foaming holes, avoiding the problem of waist shrinkage and deformation during cutting and compression, and improving the aesthetics and economy of the elastic pad; it can effectively limit the pad in the assembled state, and provide sufficient space for the pad to deform under load, ensuring the stability of the system stiffness; ensuring that the gaps between the pad and each installation boundary are equal, so that the pad is at the load center without deformation deviation.

[0036] The surface of the base pad 12-1 is formed by an embossing process, and the embossing structure on the pad surface is a wave embossing structure with an embossing depth of 0.2 to 0.5 mm, which can effectively increase the surface friction coefficient of the pad and make it less likely to slide after installation.

[0037] Preferably, the columnar protrusions 12-3 on the outer contour of the base pad 12-1 are distributed at equal or unequal intervals, the interval between two adjacent columnar protrusions 12-3 is 10 to 30 mm, and the columnar protrusions 12-3 protrude 1 to 3 mm from the outer contour of the pad.

[0038] More preferably, the clearance between the columnar protrusion 12-3 and the assembly constraint boundary of the pad is 0 to +2 mm, so that when the pad is installed, there is sufficient clearance between the pad and the nested structure, so that the pad has sufficient deformation space when loaded, ensuring that the stiffness of the assembly system is stable and reliable.

[0039] More preferably, the cross-section of the columnar protrusion 12 - 3 may be an arc shape or a polygonal shape, preferably an arc shape.

[0040] Preferably, in order to increase the friction coefficient of the product surface, the upper and lower surfaces of the base pad 12-1 are configured as a wavy embossed structure.

[0041] More preferably, the surface corrugations of the base pad 12 - 1 may be configured as convex or concave patterns.

[0042] Wherein, the base pad 12-1 is made of foamed elastic material.

[0043] Among them, the outer contours of the four sides of the base pad 12-1 are not flat planes.

[0044] The base pad 12 - 1 may be made of rubber, polyurethane or other foamed materials, and its interior is a closed-cell foam structure that is overall regular but partially irregular.

[0045] Therefore, the present invention has carried out structural innovation and manufacturing process optimization for the elastic pad. By adding a convex edge design to the contour position around the elastic pad, and adding a wave embossing structure to the upper and lower surfaces of the pad, when the convex edge of the elastic pad contour is interference-fitted with the nesting ring, sufficient deformation gap can still be reserved at the fitting position, thereby improving the stability of the pad stiffness performance. At the same time, this convex edge structure can optimize the elastic pad manufacturing process from secondary processing to one-time vulcanization foaming molding, so that a crust that closes the foaming holes is formed around the elastic pad, and the crust can fit tightly with the production mold, presenting a straight plane from top to bottom, which perfectly solves the problem of waist shrinkage and deformation of the cut surface during the cutting and pressure process during the secondary processing of the product, and improves the aesthetics and economy of the elastic pad.

[0046] It is obvious that the above description and record are only examples and are not intended to limit the disclosure, application or use of the present invention. Although the embodiments have been described in the embodiments and described in the drawings, the present invention is not limited to the specific examples of the teachings of the present invention as the best mode currently considered by the drawings and described in the embodiments, and the scope of the present invention will include any embodiment falling within the previous description and the attached claims.

Claims

1. An elastic pad for rail transit, comprising a base pad, characterized in that: The base pad is provided with a plurality of through holes extending vertically, each of which is filled with a solid elastic material column, the thickness of the solid elastic material column being 0-2 mm thicker than the thickness of the base pad, and semicircular columnar protrusions are arranged at intervals around the outer contour of the base pad; the elastic pad manufacturing process is optimized from secondary processing to one-time vulcanization foaming molding, so that a crust is formed around the elastic pad to close the foaming holes, avoiding the problem of waist shrinkage and deformation during cutting and compression, and effectively limiting the pad in the assembled state, and providing sufficient space for the pad to deform under load, thereby ensuring the stability of the system stiffness; ensuring that the gaps from the pad to each installation boundary are equal, so that the pad is at the load center without deformation deviation; The surface of the base pad is formed by embossing, the embossing structure on the pad surface is a wave embossing structure, the embossing depth is 0.2-0.5 mm, and the surface wave pattern of the base pad is set as a convex pattern or a concave pattern to increase the surface friction coefficient of the pad; The base pad is made of rubber or polyurethane foam, and its interior is a closed-cell foam structure that is overall regular but partially irregular.

2. The elastic pad for rail transit according to claim 1, characterized in that: The columnar protrusions on the outer contour of the base pad are distributed with equal or unequal spacing.

3. The elastic pad for rail transit according to claim 2, characterized in that: The distance between two adjacent columnar protrusions is 10 to 30 mm.

4. The elastic pad for rail transit according to claim 2 or 3, characterized in that: The columnar protrusions protrude from the outer contour of the pad by 1 to 3 mm.

5. The elastic pad for rail transit according to claim 1, characterized in that: The assembly constraint boundary matching clearance between the columnar protrusion and the backing plate is 0 to +2 mm.

6. The elastic pad for rail transit according to claim 1, characterized in that: The cross section of the columnar protrusion is in the shape of an arc or a polygon.

7. The elastic pad for rail transit according to claim 1, characterized in that: The outer contours of the four sides of the foundation pad are not straight planes.

Images