Abstract
Carried out simulation of oscillations of a spring-loaded roll in a roll compactor when interacting the powder being compacted with the rolls. Considering the separation of the feed and compaction areas in the contact area of the roll with the material being compacted, we obtain the dependence of the force acting on the roll on the gap size between the rolls. It is shown that this dependence is non-linear, and it can be described with a sufficiently high accuracy degree by an exponential function with a negative exponent in the working range. The given numerical solution of the equation of free nonlinear oscillations of the spring-loaded roll has shown that considering the deformation of the material being compacted leads to a reduction of the natural frequency of the system by 20–25 % compared to the case, where the pressure force of the powder on the roll is assumed to be independent of the gap size. The nonlinearity of the dependence of the pressure force on the gap also leads to the increase by 10 % in the calculated values of the maximum displacements. The developed approach to the calculation of oscillations of the spring-loaded roll in the roll compactor enables to take into account the peculiarities of deformation of the powder being compacted during its interaction with the rolls. In addition, it allows estimating the frequencies and oscillation amplitudes and setting the optimum range of spring rate values, at which the occurrence of resonance in the machine is not possible.
Highlights
The functioning of a roll compactor is determined both by the characteristics of the machine itself and by the parameters of the material being compacted
When the rolls move by a distance x from the position at which there is no spring deformation, elastic forces arise, and they are proportional to the spring deformation
The developed approach to the calculation of oscillations of the spring-loaded roll in the roll compactor enables to take into account the peculiarities of deformation of the powder being compacted during its interaction with the rolls
Summary
The functioning of a roll compactor is determined both by the characteristics of the machine itself and by the parameters of the material being compacted. Variations in the above parameters, lead to oscillations of the rolls in a radial direction. To ensure a continuous compacting process and to reduce the forces acting on the rolls, which are caused by load variations, one of the rolls is spring-loaded. In the case of resonance, roll’s oscillation can lead to inhomogeneity of the flakes, which in turn can have a negative effect on the quality of the final product. To exclude resonance from the operating mode it is necessary to know oscillation parameters of the spring-loaded roll, which depend both on the mass of oscillating parts and spring rate, and on the amount and characteristics of the material being compacted and located between the rolls
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