Production process of thermoplastic elastomer rail pad

Abstract

The invention provides a production process of a thermoplastic elastomer rail pad, and belongs to the technical field of railway fittings. The production process comprises the following steps: (1) drying raw materials, namely, adding rubber to a dryer to dry for at least two hours under drying temperature of 110 to 130 DEG C; (2) injection molding, namely, performing injection molding through an injection molding machine, adding the dried raw material to a material barrel of the injection molding machine for heating, and then closing a die, injecting, maintaining the pressure, cooling, and opening the die to finish injection molding; (3) cutting nozzles, namely, moving the product subjected to injection molding from a die cavity, and removing burr through a nozzle cutting machine so as to meet the requirements of a production drawing and product technology; and (4) examining and testing, namely, warehousing qualified thermoplastic elastomer rail pads. With the adoption of the production process, the produced thermoplastic elastomer rail pad is stable in structure, small in plastic change, and small in elastic deformation under heavy load, reaches 300 to 500kN/mm of static stiffness, has service life longer than that of a steel rail, realizes stable line and driving safety, and also enables the reduction of the cost of repair and maintenance.

Description

Technical field [0001] The invention belongs to the technical field of railway accessories, and relates to a cushion layer between a steel rail and a sleeper in a railway track structure, and particularly refers to a production process of a thermoplastic elastomer under-rail cushion plate. Background technique [0002] The heavy-load and high-speed railway transportation is the development trend of modern railway, and it is also the focus of railway development during my country's 12th Five-Year Plan. With the increase of speed, transportation volume and axle load, the damage of trains to the line has become more and more serious, and the damage rate of rail base materials and joints has greatly increased, which poses a great threat to the safe operation of trains. The traditional solution is to use under-rail rubber pads to provide track elasticity and ease the damage to the line by heavy-duty trains. However, due to the low rigidity and unreasonable structure of the under-rail...

AI Technical Summary

Problems solved by technology

However, due to the low stiffness and unreasonable structure of the under-rail rubber pads widely used in my country, the internal stress of the rubber pads under heavy loads is much higher than that of ordinary line pads. The damage of the backing board is relatively serious, and the permanent deformation is larger than that of ordinary line backing boards

In addition, the weather resistance of the rubber pad is relatively poor. Under the action of heat, oxygen, ultraviolet rays, rain, freezing, etc., the service life of the rubber material will be greatly reduced. At the same time, the aging process of the material is accelerated under high frequency and heavy load. It will lead to premature failure of the material, and then affect the stiffness change of the backing plate, directly endangering the stability and safety of high-speed trains and heavy-duty trains