A kind of preparation method of railway sleeper

Abstract

The invention discloses a preparation method of a railway sleeper. The preparation method of the railway sleeper comprises the following steps: (1) evenly mixing materials in mixing equipment at high speed, placing the mixture in a spring feeder, mounting reinforcing ribs from the tail of a forming mold of forming equipment, and enabling free ends of the reinforcing ribs to exceed the position of a material inlet of the forming mold; (2) starting the spring feeder and a forced feeder, pressing the materials in the step 1 in a planetary screw extrusion system of the forming equipment and fully plasticizing the materials; (3) fully discharging gas of the materials which are fully plasticized in the step 2 at the position of a connecting device at the tail end of the planetary screw extrusion system, then guiding the materials in a single-screw extrusion system of the forming equipment, further plasticizing and melting and establishing stable extrusion pressure; and (4) feeding melt on which pressure is built up in the step 3 in the forming mold from a side rear end of the forming mold under the effect of the pressure, driving the reinforcing ribs to be conveyed forwards by using the molten materials, and shaping in the forming mold to form the large-cross-section reinforced railway sleeper.

Description

technical field [0001] The invention relates to the field of construction, in particular to a method for preparing railway sleepers. Background technique [0002] Most railway sleepers are made of wooden sleepers and cement sleepers. However, wooden sleepers are prone to aging, have a short service life, and are frequently replaced. Cement sleepers are heavy, low in elasticity, and brittle, and their cost is much higher than that of wooden sleepers, and their maintenance costs are also higher. In order to meet the needs of railway construction, scholars at home and abroad have conducted some research on the molding technology of polymer composite crossties as early as the early 1990s, including glass fiber reinforced crossties, polystyrene reinforced crossties, and gypsum reinforced crossties. Sleepers, polyurethane foam sleepers, and recycled plastics and waste minerals to synthesize sleepers, etc., and the main molding methods include compression molding, intermittent extr...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic patents for synthetic sleepers are mostly pultruded long-fiber reinforced polyurethane sleepers. There are the following problems in related technologies: (1) Although the molding process realizes the continuous production of sleepers, in order to facilitate the arrangement and impregnation of fibers, prevent internal Excessive heat release causes core burning, and the cross-sectional size of the formed sleeper is usually controlled at 210mm×80mm, so that block-to-block bonding is required, which increases the difficulty and cost of manufacturing the sleeper; (2) In order to realize the recycling of waste plastics, The high-speed kneaded waste plastics, fly ash and auxiliary agents are added into the extruder to plasticize and melt, and then molded in the mold; or use extrusion molding technology to make waste tire fragments into sleepers, but the equipment used in the above patent It is an ordinary screw extruder, which has good molding effect but poor mixing effect, thus reducing product performance; or although the two-stage extrusion system is used to prepare waste plastic railway sleepers, the mixing effect of materials is improved, but the strength of the obtained sleepers is relatively low. low, slow cooling

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