Mineral sizers is a kind of high efficiency breaking equipment, which is widely used in breaking operation in coal and chemical industry. The roller teeth are the main working parts and are in direct contact with the material. Therefore, the quality of roll tooth design is directly connected to the production efficiency and service life of the mineral sizers.
During the breaking process, it is inevitable that hard and difficult materials suck as iron will be encountered, resulting in jamming and causing great impact to the roll teeth. Such factors should be considered in the design to make the equipment safe and reliable. However, there is still a lack of feasible calculation methods, and it depends more on the experience of the designer to carry out. In this paper, we mainly use the finite element method to simulate the process of jamming and try to provide a more effective strength analysis method.
1 Calculation of the selection of working conditions mineral sizers technical parameters
Model 2PLF 6060
Feed size/mm300
Discharge size/mm
60 Roll speed/r-min150
Motor power/kW 25
Breaking strength/MPa≤120

Mineral sizers in normal operation, suddenly a hard foreign object such as iron falling into the roll teeth caused by jamming, foreign objects clamped on the tips of the three staggered roll teeth of the two tooth rolls, one of the tooth rolls only one tooth force, then the impact of the tooth roll and its connected rotating parts completely on a roll tooth.
Mineral sizers have a simple structure, and one breaking roll, coupling, reducer and motor are taken for the calculation. For the convenience of calculation, the model is simplified, and the Mineral sizers breaking roll adopts the tooth-disk structure, with five tooth-disks, one tooth-disk is taken as the object of study, and other tooth-disks and rotating parts are applied to the tooth-disk in the form of rotating inertia unit.
3 Boundary conditions tooth disc: the speed of tooth disc is 50r/min, then its angular velocity w=xn/30=5.23rad/s. locking iron: constrain its 3 parallel translation degrees of freedom
Analysis of results:
As can be seen from the dynamic demonstration process in the post-processing, when the minerl sizers of roller teeth collide with the iron, the toothed roller suddenly stops rotating and the stress value quickly rises to a spike and then falls back. The higher stress of the tooth roller is concentrated in the tip part of the tooth, and the maximum Mise stress value reaches 782 MPa (which exceeds the yield limit of the material, and the Mise stress values of other positions are in the range of 150 MPa shift degrees of freedom).

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