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An eva track pad

A backing plate and track technology, applied in the field of railway fasteners, can solve problems such as poor hardness, flattening of backing plates, unsafe rails, etc., and achieve the effects of increasing hardness, prolonging service life, and improving social benefits.

Inactive Publication Date: 2017-03-22
王冠东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its hardness is poor, and the Shore scleroscope hardness is generally 43 degrees
Frequent use, the backing plate will be crushed, resulting in unsafe factors on the track

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Stir 50 kg of raw materials of PA66 silk in parts by weight of 1, coupling agent in parts by weight of 0.1 parts, and EVA in parts by weight of 99 parts in a mixer;

[0019] 2. In the φ50 twin-screw extruder, the uniformly stirred raw materials are extruded and drawn, and the extrusion temperature is 160°C;

[0020] 3. After the above wire drawing is cooled, cut it into pellets with a shredder;

[0021] 4. The above-mentioned granules are injection-molded into track pads with an injection molding machine.

[0022] The Shore hardness of the prepared track backing plate was 44 degrees.

Embodiment 2

[0024] 1. Stir 50 kg of raw materials of PA66 silk of 5 parts by weight, coupling agent of 0.1 parts by weight, and EVA of 95 parts by weight in a mixer;

[0025] 2. Extrude and draw the uniformly stirred raw materials in a φ50 twin-screw extruder, and the extrusion temperature is 161°C;

[0026] 3. After the above wire drawing is cooled, cut it into pellets with a shredder;

[0027] 4. The above-mentioned granules are injection-molded into track pads with an injection molding machine.

[0028] The Shore hardness of the prepared track backing plate was 44 degrees.

Embodiment 3

[0030] 1. Stir 50 kg of raw materials of PA66 silk with 10 parts by weight, coupling agent with 0.1 parts by weight, and EVA with 90 parts by weight in a mixer;

[0031] 2. Extrude and draw the evenly stirred raw materials in a φ50 twin-screw extruder, and the extrusion temperature is 162°C;

[0032] 3. After the above wire drawing is cooled, cut it into pellets with a shredder;

[0033] 4. The above-mentioned granules are injection-molded into track pads with an injection molding machine.

[0034] The Shore hardness of the prepared track backing plate was 44 degrees.

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Abstract

Provided is an EVA track backing plate, characterized in that the materials are 1-45 parts by weight of PA66, 0.1-0.5 parts by weight of a coupling agent, and 55-99 parts by weight of EVA. The PA66 is in filiform shape, and 0.4 mm<=length<=0.8 mm, 0.08 mm<=[psi]<=0.15 mm. Compared with the prior art, beneficial effects of the EVA track backing plate are that using a characteristic that tensile strength and hardness of the PA66 are high, the PA66 and the EVA are mixed, hardness of the backing plate is improved on the basis of maintaining original elasticity of EVA. The Shore hardness of the EVA track backing plate reaches 85 DEG. Heating temperature is originally designed. The melting point of the EVA does not exceed 160 DEG C, and the melting point of the PA66 is higher than 230 DEG C. Under the condition of heating between 160 DEG C and 190 DEG C, the EVA is molten, but the PA66 is not molten. In the state, the PA66 maintains the original filiform shape, a plurality of PA66 filaments randomly distribute in the EVA to form a net shape, just like cement with reinforcing steel bars, so hardness of the EVA is increased. The antishock property is maintained. The track backing plate made of the material is prolonged in service life, and can get preferable social benefits.

Description

technical field [0001] The invention relates to the technical field of railway fasteners, in particular to an under-rail backing plate of a railway fastener. Background technique [0002] At present, steel sleepers or wooden sleepers are mostly used in traditional high-speed railways, railways, and urban railways, and then some elastic backing plates are used between the steel sleepers or wooden sleepers to improve the bearing capacity. The material of the backing plates is generally EVA (ethylene). - Vinyl acetate copolymer, the English name is: Ethylene Vinyl Acetate), which has high resilience, high tensile strength, high toughness, and good shockproof and cushioning properties. However, its hardness is poor, and the Shore scleroscope hardness is generally 43 degrees. With frequent use, the backing plate will be crushed, causing unsafe factors in the track. Contents of the invention [0003] In order to solve the above problems, the object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B9/68C08L23/08C08L77/06
Inventor 王冠东王国才
Owner 王冠东