Roadbed vibration damping pad and preparation process thereof

Abstract

The present invention discloses a roadbed vibration damping pad and its manufacturing process. By integrally forming the lap strips with the vibration damping pad, the lap strips do not need to be processed after the vibration damping pad structure is prepared. This simplifies the manufacturing process and improves the stability of the lap strips, making them less likely to tear during use and reducing product losses. By increasing the thickness of the lap strips at the junction with the vibration damping pad, the lap structure becomes more secure.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit vibration reduction, and in particular to an integrally formed roadbed vibration reduction pad and a preparation process thereof. Background Art

[0002] In my country's high-speed rail and urban rail transit lines, roadbed vibration-damping pads are usually laid on the roadbed to reduce the vibration and noise generated by the rapid operation of vehicles. Since the specifications and dimensions of a single roadbed vibration-damping pad are usually different from the width of the entire roadbed, when laying the roadbed vibration-damping pad, overlapping strips are set on the side walls of the top surface of the vibration-damping pad to achieve gap splicing of each vibration-damping pad, so that the laid vibration-damping pad is a whole surface.

[0003] In the prior art, the lap strip is a separate component in the preparation process of the vibration damping pad, which is spliced together with the covering layer on the upper surface of the vibration damping pad, and the lap strip and the covering layer are formed into one piece through a hot pressing and vulcanization process. In this preparation method, the lap strip is a separate product component that needs to be laid separately on one side of the vibration damping pad covering layer in the flow process line during the production process, and is integrated with the vibration damping pad into an integrated structure through a glue filling and vulcanization process. This process requires adding a lap strip splicing process after the roadbed vibration damping pad is prepared, which extends production efficiency and improves the production cycle and production cost. In addition, the lap strip as a separate product is prone to problems such as loose laps, thin lap strip thickness, and poor tear resistance when spliced together later. It is easy to break during transportation or installation on the construction site, which brings difficulties to smooth construction. Summary of the Invention

[0004] The present invention aims to solve the problem that the overlapping strip and the vibration damping pad are vulcanized separately and are easily lost and the overlapping is not firm when each is a separate product.

[0005] In order to solve the above technical problems, an embodiment of the present invention discloses the following technical solution: a vibration damping pad preparation process, characterized in that the preparation process includes the following steps.

[0006] A damping layer, a first rubber bonding layer, a first woven cloth layer, a second rubber bonding layer, an interlayer, a third rubber bonding layer, a second woven cloth layer, a fourth rubber bonding layer, and a covering layer are stacked from bottom to top to form a rubber vibration-damping road pad stacking layer; the side walls of the multi-layer stacking structure on the side where the overlapping layer is not provided are flush; the width of the interlayer is greater than the width of the covering layer, and the side on which the overlapping strip of the roadbed vibration-damping pad is provided has an interlayer protrusion extending out of the side wall of the multi-layer stacking structure.

[0007] The stacked layers of rubber vibration damping road pads are fed into a vulcanizing press, which includes an upper plate and a vulcanizing press base, wherein a vibration damping pad hot pressing mold is provided on the vulcanizing press base, and the vibration damping pad hot pressing mold has a lap strip forming groove.

[0008] The upper plate is driven to hot-press the rubber stacking layer toward the vulcanizer base to perform a first vulcanization process, wherein the portion of the interlayer extending out of the covering layer is separated from the interlayer structure during the hot-pressing process and integrated with the covering layer to form a lap strip of the vibration damping pad.

[0009] The sandwich protrusion extends into the forming groove of the overlap strip, is softened and separated from the sandwich structure in the hot pressing process of the vulcanizing press to form a overlap strip, and the overlap strip is integrated with the covering layer in the hot pressing process.

[0010] The material of the interlayer protrusion extending into the forming groove of the lap strip is the same as the material of the interlayer.

[0011] The thickness of the lap strip forming groove close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

[0012] The hot pressing forming mold is in a plate-like structure as a whole, and through holes are arranged on its upper surface in a matrix array.

[0013] The through hole is in the shape of at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

[0014] The stacked layers of rubber vibration damping road pads are fed into and removed from between the upper plate of the vulcanizing press and the base of the vulcanizing press via a transmission roller group, or the stacked layers of rubber vibration damping road pads are fixed between the upper plate of the vulcanizing press and the base of the vulcanizing press.

[0015] A roadbed vibration damping pad prepared according to the aforementioned vibration damping pad preparation process, wherein the lap strip and the interlayer are prepared from the same rubber functional layer.

[0016] Wherein, the thickness of the lap strip on the side close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

[0017] The protrusion is in the shape of at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

[0018] A roadbed vibration-damping pad, which is formed by stacking a damping layer, a first rubber bonding layer, a first woven cloth layer, a second rubber bonding layer, an interlayer, a third rubber bonding layer, a second woven cloth layer, a fourth rubber bonding layer, and a covering layer from bottom to top; the lower surface of the damping layer at the bottom of the roadbed vibration-damping pad has an array-distributed convex structure, and the side wall of the covering layer at the top of the roadbed vibration-damping pad is integrally formed with a lap strip structure, the lap strip is flush with the upper surface of the covering layer, and the material of the lap strip is the same as that of the interlayer.

[0019] Wherein, the thickness of the lap strip on the side close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

[0020] The protrusion is in the shape of at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

[0021] Compared with the prior art, the present invention has the following beneficial effects.

[0022] By integrating the lap strips with the vibration damping pads, there's no longer a need to add the lap strips after the vibration damping pad structure is fabricated, as is the case with existing technologies. This simplifies the manufacturing process and improves the stability of the lap strips, making them less susceptible to tearing during use and reducing product losses. By increasing the thickness of the lap strips where they meet the vibration damping pads, the lap joint structure becomes more robust. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the vibration damping pad overlap strip structure according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of a mold for preparing a vibration damping pad according to an embodiment of the present invention.

[0025] Figures 3A-3B Schematic diagram of the structure of the vibration damping pad according to an embodiment of the present invention.

[0026] Description of the accompanying drawings.

[0027] Covering layer 1, first rubber bonding layer 8, first woven fabric layer 7, second rubber bonding layer 6, interlayer 5, third rubber bonding layer 4, second woven fabric layer 3, fourth rubber bonding layer 2, damping layer 9, mold body 10, through hole 11, lap strip forming groove 12, vibration damping pad body 13, protruding structure 14, lap strip 15. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that the embodiments described 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 making creative work are within the scope of protection of the present invention.

[0029] It should be understood that the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0030] Terms such as "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, the definition of "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of such features.

[0031] An embodiment of the process for preparing a vibration damping pad with a lap strip according to the present invention comprises:

[0032] like Figure 1 As shown, the damping layer 9, the first rubber bonding layer 8, the first woven fabric layer 7, the second rubber bonding layer 6, the interlayer 5, the third rubber bonding layer 4, the second woven fabric layer 3, the fourth rubber bonding layer 2, and the covering layer 1 are stacked from bottom to top to form a rubber roadbed vibration damping pad stacking layer.

[0033] The thickness parameters of the first and second woven cloth layers 3 and 7 in the above-mentioned stacking structure can be selected as 0.8mm-1.6mm, and as a preferred embodiment can be 1mm or 1.2mm. The specific material of the woven cloth layer can be cotton cloth, polyester fiber, nylon fiber, vinylon fiber or a high-temperature resistant woven cloth layer mixed with the above fiber materials.

[0034] For the rubber functional layer structures such as the damping layer, interlayer and cover layer in the stacked layers mentioned above, the strength, elastic deformation and deformation recovery functions of the rubber material, as well as the different bonding performance requirements are adjusted separately. Among them, the damping layer at the bottom, as the main vibration and noise reduction functional structure, tends to select a functional rubber material with good elasticity and good elastic recovery ability. The top cover layer, as the upper contact element of the vibration damping pad, must have good wear resistance, oil resistance, ozone resistance and UV resistance, which can effectively extend the life of the vibration damping pad. The rubber material for making the cover layer should be an elastomer with good hardness and wear resistance, ultra-high molecular weight and narrow molecular weight, small oil filling volume, and good fatigue resistance and crack growth resistance, as well as strain-induced crystallization effect. However, due to the high hardness and good wear resistance of the cover layer, its material is not suitable for preparing the lap strip component connecting adjacent roadbed vibration damping pad structures.

[0035] The sidewalls of the stacked multi-layer functional structure on the side without the overlapping layer are flush; the width of the main portion of the damping layer and the covering layer is consistent with the width of the woven fabric laminate. The width of the interlayer is greater than the width of the covering layer, and the side of the track bed vibration damping pad provided with the overlapping strip has an interlayer protrusion extending out of the sidewall of the multi-layer stacked structure.

[0036] The stacked layers of rubber vibration damping road pads are fed into a vulcanizing press, which includes an upper plate and a vulcanizing press base; wherein a vibration damping pad hot pressing mold is provided on the vulcanizing press base, Figure 2This is a schematic diagram of the cross-sectional structure of the mold for preparing a vibration damping pad. The hot pressing mold is an overall plate-like structure. The figure shows that the mold body 10 is provided with a trough for accommodating the stacked material of the vibration damping pad. A series of through-holes 11 are formed at the bottom of the trough, and a lap joint forming groove 12 is provided on one side of the trough for accommodating the stacked material of the vibration damping pad. The through-holes 11 are in the shape of at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column, or a triangular truncated cone.

[0037] As a preferred embodiment, the thickness of the lap strip forming groove 12 close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

[0038] The stacked layer of rubber vibration damping road pads is fed into and removed from between the upper plate of the vulcanizing press and the base of the vulcanizer via a transmission roller set. As an alternative embodiment, the stacked layer of rubber vibration damping road pads is fixed between the upper plate of the vulcanizing press and the base of the vulcanizer.

[0039] When the stacked layers of rubber vibration damping road pads are fed into the vulcanizing press, the interlayer protrusions extend out of the sidewalls of the multi-layer stacked structure, and their positions correspond to the positions of the lap strip forming grooves 12 on the hot pressing mold.

[0040] Figure 3A The schematic diagram of the structure of the vibration damping pad prepared by the hot pressing process is shown. The vibration damping pad includes a vibration damping pad body 13, a protruding structure 14 and a lap strip 15, wherein the roadbed vibration damping pad is formed from bottom to top by a damping layer, a first rubber bonding layer, a first woven cloth layer, a second rubber bonding layer, an interlayer, a third rubber bonding layer, a second woven cloth layer, a fourth rubber bonding layer and a covering layer stacked; the lower surface of the damping layer at the bottom of the roadbed vibration damping pad has an array-distributed protruding structure 14, and the shape of the protruding structure is at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

[0041] The side wall on the top of the roadbed vibration damping pad is integrally formed with a lap strip structure 15, which is flush with the upper surface of the covering layer and made of the same material as the interlayer rubber functional layer of the vibration damping pad.

[0042] As a preferred embodiment, the thickness of the overlapping strip 15 on the side close to the main body 13 of the roadbed vibration-damping pad is greater than the thickness away from the main body of the roadbed vibration-damping pad.

[0043] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A process for preparing a roadbed vibration damping pad, characterized in that: The preparation process comprises the following steps: The damping layer, the first rubber bonding layer, the first woven fabric layer, the second rubber bonding layer, the interlayer, the third rubber bonding layer, the second woven fabric layer, the fourth rubber bonding layer, and the covering layer are stacked from bottom to top to form a rubber vibration damping road pad stacking layer; wherein the side walls of the multi-layer stacking structure on the side where the overlapping layer is not provided are flush; wherein the width of the interlayer is greater than the width of the covering layer, and the side where the overlapping strip of the roadbed vibration damping pad is provided has an interlayer protrusion extending out of the side wall of the multi-layer stacking structure; The stacked layers of rubber vibration damping road pads are fed into a vulcanizing press, wherein the vulcanizing press comprises an upper plate and a vulcanizing press base, wherein a vibration damping pad hot pressing mold is provided on the vulcanizing press base, and the vibration damping pad hot pressing mold has a lap strip forming groove; The upper plate is driven to hot-press the rubber stacking layer toward the vulcanizer base to perform a first vulcanization process, wherein the portion of the interlayer extending out of the cover layer passes through the hot-pressing process to form a lap strip of the vibration damping pad.

2. The preparation process according to claim 1, wherein The sandwich protrusion extends into the forming groove of the overlap strip. In the first vulcanization process, the sandwich protrusion softens and separates from the sandwich structure to form a overlap strip, and the overlap strip is integrated with the covering layer in the hot pressing process.

3. The preparation process according to claim 2, wherein: The material of the sandwich protrusion extending into the forming groove of the connecting strip is the same as that of the sandwich.

4. The preparation process according to claim 1, wherein The thickness of the lap strip forming groove on the side close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

5. The preparation process according to claim 4, wherein: The damping pad hot pressing mold is in a plate-like structure as a whole, and through holes are arranged on its upper surface in a matrix array.

6. The preparation process according to claim 5, characterized in that The through hole is in a shape of at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

7. The preparation process according to claim 1, wherein: The stacked layer of rubber vibration damping road pads is sent into and out of between the upper plate of the vulcanizing press and the base of the vulcanizing press via a transmission roller group, or the stacked layer of rubber vibration damping road pads is fixed between the upper plate of the vulcanizing press and the base of the vulcanizing press.

8. A roadbed vibration damping pad prepared by the vibration damping pad preparation process according to any one of claims 1 to 7, characterized in that: The overlapping strips and the interlayer are made of the same rubber functional layer; the covering layer and the overlapping strips are made of different materials.

9. The roadbed vibration damping pad according to claim 8, characterized in that: The thickness of the lap strip on the side close to the roadbed vibration damping pad is greater than the thickness away from the roadbed vibration damping pad.

10. The roadbed vibration damping pad according to claim 9, characterized in that: The lower surface of the damping layer at the bottom of the roadbed vibration damping pad has an array-distributed convex structure, and the shape of the convex structure is at least one of a truncated cone, a cylinder, an elliptical truncated cone, an elliptical column, a square column or a triangular truncated cone.

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