Dynamic analysis of a roller molding unit with a crankshaft actuator
DOI:
https://doi.org/10.32347/2410-2547.2019.102.91-108Keywords:
roller molding unit, driving mechanism, effort, moment, rigidity of the drive, dissipationAbstract
For the purpose of increase in reliability and durability of roller molding unit with the driving mechanism with a crank and the connecting rod loadings in elements of her design and the drive are calculated, dependences for definition of effort in the connecting rod, necessary for reduction in back and forth motion of the forming cart, and normal reactions of guides of the movement of the forming cart to the directing rollers depending on a crank angle of rotation are received. For a research of loadings the two-mass dynamic model of roller forming installation in which power and power characteristics of the driving engine and forming cart, rigidity of the driving mechanism and its dissipation are considered is used. Function of change of necessary torque for ensuring process of consolidation of products of construction mixes taking into account dissipation of the driving mechanism is defined. Rated settlement power on which the electric motor is chosen is determined by average value of the moment of forces of resistance for a cycle of turn of a crank, connecting couplings and a reducer are picked up. Using Lagrange's equation of the second sort, for the roller forming installation with the driving mechanism with a crank and the connecting rod presented by two-mass dynamic model the differential equations of the movement are worked out. As a result of a numerical experiment for roller forming installation with the driving mechanism with a crank and the connecting rod the value of the rigidity of the driving mechanism given to an axis of rotation of a crank at which the minimum loadings in couplings of the driving mechanism are observed is defined. The dependence of the moment is installed in the drive coupling from dissipation coefficient size, functions of change of kinematic characteristics of installation at different values of coefficient of dissipation are calculated. The recommended dissipation coefficient size for roller forming installation with the driving mechanism with a crank and the connecting rod is determined.
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