As the key equipment in coal mine production, crusher plays an important role in the mechanized production of coal mine. mineral sizers are mainly used in medium and fine crushing in coal mine production, and have the characteristics of simple structure, reliable operation and low cost. Aiming at mineral sizers, the working principle of mineral sizers is introduced, and the design of crushing gear disc, a key component, is analyzed. The conclusion of this paper will be beneficial to further study and optimization of mineral sizers.
Now some industrial crusher according to its structural form can be divided into jaw crusher, jaw roll crusher, vibrating jaw crusher, vibrating crusher, rotary crusher, high pressure roll crusher, round crusher, impact crusher, impact crusher, hammer crusher, mineral sizers, vertical shaft crusher and many other categories: According to the particle size requirements of the product after crushing, it can be divided into coarse crushing, medium crushing, fine crushing and fine crushing. In many coal preparation plants in China, toothed roll crusher has been widely used for its simple structure, reliable operation and low cost.
Mineral sizers can be divided into single-tooth roller crushers, double-tooth roller crushers and multi-tooth roller (three, four and six roller) crushers according to the number of crushing roller days. Among them, single-toothed roller, double-toothed roller and four-toothed roller crusher are the most widely used in industrial sites. Single tooth roll crusher tooth roll is longer, mainly used for coarse crushing; The tooth rolls of the double-toothed roller crusher and the four-toothed roller crusher are shorter and are mainly used for medium and fine crushing. Compared with other existing crushers, the double-toothed roller crusher has obvious advantages in structure and performance. Mainly the overall structure is simple, compact structure and light weight. The motor and the main machine can be arranged in parallel, so the floor area is reduced, and the user can install the motor around according to the needs of the equipment layout. All gear drives can be combined in a box, the whole machine structure is compact. Therefore, the volume is small and the weight is light, and the weight of the general upper toothed roller crusher is only about half of the other types of crusher with the same production capacity. Because mineral sizers crusher disc is the main crushing part of the tooth roll crusher, the crushing tooth is the main working part of the double tooth roll crusher, but also the main vulnerable part, depending on the type of broken material, production capacity and input and discharge granularity, the shape of the tooth, fastening method, tooth parameters are different requirements. Therefore, in the design need to focus on this part, this paper for the crushing gear disc, the use of the latest tooth roller design method, the design analysis. 1 Double-toothed roll crusher Working principle Double-toothed roll crusher is a kind of roll crusher, the surface of the crushing roller staggered convex teeth, two rollers opposite rotation, the block broken. Toothed roll crusher is an important crushing equipment used in combination with sintering machine, which is suitable for the medium crushing of cold and hot sintered blocks in metallurgical industry and sintering section of steel mills. The working condition and crushing efficiency of the equipment directly affect the output of qualified sintered block and the working rate of the whole sintering section. The two crushing rollers are driven by the transmission device to rotate opposite, and the fixed roller is supported on the fixed bearing. The moving roller is supported on the moving bearing, and the safety device (spring protection device) supports the moving bearing, and the positioning pad is used to adjust the gap between the two rollers, and the minimum distance is also called the width of the discharge port to control the particle size of the broken block. The material is added from the top of the two rollers, and under the action of friction between the roller and the material, the material is brought between the two rollers, squeezed and broken, and discharged from the lower part. The two broken silver pieces rotate opposite each other under the drive of the transmission device, and the fixed roller is supported on the fixed bearing. The moving roller is supported on the moving bearing, and the safety device (spring protection device) supports the movable bearing, and the positioning pad is used to adjust the gap between the two bars, and the minimum distance is also called the width of the discharge port to control the particle size of the broken block product. The material is added from the top of the two rollers, and under the action of friction between the roller and the material, the material is brought between the two rollers, squeezed and broken, and discharged from the lower part. The particle size after crushing is generally controlled to 80 to 120mm.
The most important part of the double-toothed roller crusher is its crushing gear plate. The design of the new tooth plate is completely different from the previous tooth rolls. It contains a pair of spiral rolls, each of which has a crushing tooth protruding radially. The crushing tooth is arranged into a family of teeth separated along the circumference of an axial interval. It can break small pieces of material better through the cooperative bite of the crushing teeth on the two rollers. However, large pieces of material cannot enter the bite area of the opposite crushing teeth on the two rollers, and can not be broken.
In order to solve this problem, the fracture teeth on each roll of the mineral sizers are rehearsed in an axial sequence. The adjacent crushing teeth are staggered in 36 phases on the same radial axis of the main shaft, and the double sticks form an "eight" shape layout. The section view of the crushing gear disc shows that the crushing cone and crown crushing teeth on one roll and the crushing cone and crown crushing teeth on the other roll are staggered with their axial direction. Because the adjacent crushing teeth are staggered 36 degrees in the same radial direction on the main shaft, a very human occlusion space is formed. When a crushing cone and crown crushing teeth on one roll pass through the middle of an adjacent crushing cone and crown crushing teeth on another roll, the human block particle can be crushed.
Based on the analysis of mineral sizers, in view of some existing crushing problems, the structure of the new crushing disc, which is a key component, is introduced. In the design, the adjacent crushing disc is staggered at 36° on the same radial direction of the main shaft, and the double stick is in the shape of "eight". According to the second crushing theory, through the force analysis of the material in the crusher, the relationship between the force and the meshing Angle of the gear roller material and the calculation formula of the total tangential force of the gear rod are obtained, which provides a theoretical basis for the future structural optimization and application of the wonton crusher.