Mineral sizers are suitable for the crushing of medium hardness materials such as limestone, slag, coke, coal and other materials in the cement, chemical, power, metallurgy, building materials, refractory and other industrial sectors. Crushing rollers are the main crushing components on mineral sizers. The two-roll crusher uses a pair of round rollers rotating opposite each other to break materials, usually relying on the extrusion pressure between the two crushing rollers to achieve the crushing of materials. The material falls between the two rollers through the charging port on the upper part of the equipment, is brought into the gap between the two rollers and is gradually crushed, and the finished material leaks out from the lower part. When there is a hard and can not be broken material, the roller automatically gives way, so that the gap between the rollers increases, the hard material falls, with the role of hydraulic cylinder or spring, the roller returns to the original gap, so as to protect the machine, adjust the gap between the two rollers, you can control the maximum particle size of the product. The crushing roll in mineral sizers squeezes the material under high pressure. The two extrusion forms rotating opposite each other are the key factors in mineral sizers work. The structure of the crushing roll is the key component that determines the degree of crushing of the material. At present, the commonly used crushing roller includes the roller teeth evenly distributed on the surface of the roller body, and the material is crushed through the action between the roller teeth, but the crushing effect of the general roller teeth is general, and the crushing effect can only be achieved. The technical problem to be solved is to provide a simple structure, reasonable design, fine crushing degree of the meshing tooth type roll crusher. In order to solve the above technical problems, the technical solutions are: The roller crusher comprises a shell, wherein the shell is installed with two crushing rollers arranged in parallel, the shell is also installed with a driving device, the crushing roller comprises a roller wheel shaft, the roller wheel shaft is fixed with a roller wheel body, and the outer circumference of each roller wheel body is uniformly arranged with a plurality of straight coupled gear teeth. The direct-connected wheel teeth extend from one end of the roller wheel body along the axis direction to the other end of the roller wheel body, and the direct-connected wheel teeth on the two roller wheel bodies engage each other, and the outer surface of each roller wheel body is distributed along the axial interval with a plurality of annular guide groove, the inner circumference of the annular guide groove corresponds to the root of the direct-connected wheel teeth. The outer circumference of the annular feeding guide groove corresponds to the top of the direct coupled gear teeth, and the annular feeding guide groove on the two roller wheel bodies is staggered. As the preferred technical scheme, the annular material guide groove is a rectangular material guide groove or a v-shaped material guide groove. One end of the scraping device is arranged on the housing, and the other end of the scraping device is located in the housing and extends to the annular guiding groove. The scraping device comprises a scraping seat, the scraping seat is fixed to the shell through a screw, the inner end of the scraping seat is also fixed with a scraping column, the tail end of the scraping column extends to the ring guide groove, the scraping edge corresponding to the ring guide groove is also provided at the tail end of the scraping column. As the preferred technical scheme, the direct coupling gear teeth and the roller body are integrated into the forming metal structure. As a result of the adoption of the technical scheme, the meshing toothed roll crusher comprises a shell, the shell is installed in parallel with two crushing rollers, the shell is also installed with a drive device, mineral sizers crushing roller comprises a roller shaft, the roller shaft is fixed with a roller wheel body, each of the roller wheel body is uniformly arranged peripherally with a plurality of rows of direct tooth. The direct-connected wheel teeth extend from one end of the roller wheel body along the axis direction to the other end of the roller wheel body, and the direct-connected wheel teeth on the two roller wheel bodies engage each other, and the outer surface of each roller wheel body is distributed along the axial interval with a plurality of annular guide groove, the inner circumference of the annular guide groove corresponds to the root of the direct-connected wheel teeth. The outer circumference of the annular feeding guide groove corresponds to the top of the direct coupled gear teeth, and the annular feeding guide groove on the two roller wheel bodies is staggered; the utility model has the advantages of.