At present, China's coal deep processing technology has yet to be developed, the utilization degree is low, there are high energy consumption, low efficiency, pollution and waste of serious status quo, causing a series of environmental pollution, resource crunch and other problems. With the reduction of non-renewable resources such as coal and the proposed new technology of "more crushing and less grinding", the domestic demand for large reducer mineral sizers will increase day by day. In recent years, the domestic research on large reducer box double-toothed roller crusher has shown a rapid development trend, especially in the crushing theory, material properties, crushing tooth shape, crushing tooth layout, crushing tooth material and heat treatment and other aspects of the research has been close to the foreign level, but still need to further improve the comprehensive performance of products.
Aiming at the research and development of a certain model, this paper focuses on the above points to provide reference for similar design of other models. According to the actual demand of coal mine, on the basis of comparing the same type of gear crusher at home and abroad in recent years, the technical parameters of the developed model are put forward and the relevant theoretical calculation is carried out, which provides the basis for the selection of the whole machine components. According to the overall technical scheme, the specific implementation methods of the mechanical, control and hydraulic subsystems are given. Based on the analysis of various factors of the crushing effect, aiming at the composition and mechanical properties of the crushing material, the shape of the crushing teeth, the installation structure of the crushing teeth, the layout form of the crushing teeth, the material of the crushing teeth and the heat treatment process are studied respectively, and the key technical parameters of a certain type of gear tooth crusher are determined. The three-dimensional model of the crusher was established with Solidworks, which provided guidance for the on-site assembly of the crusher. Based on the engineering practice, the change of maximum stress and displacement value of the crown of the broken tooth under different loading conditions was studied based on the finite element method. ANSYS Workbench software is used to optimize and analyze the crushing crown, which makes the crushing crown lighter, further reduces the maximum stress and deformation of the crushing crown, and greatly improves the mechanical properties of the crushing crown. The tooth crusher was successfully developed and tested in a coal mine. Through the statistical analysis of the field test data, the technical design index of the crusher is reached, and the rationality of the structural design of mineral sizers in the crushing mode, the shape of the crushing teeth and the arrangement of the crushing teeth is verified.