Análisis dinámico del mecanismo paralelogramo del cortacogollo desfibrador para la cosechadora cañera cubana CCA- 5000
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Abstract
En el presente trabajo se realiza un estudio del estado tensional-deformacional del mecanismo paralelogramo del cortacogollo desfibrador para la cosechadora cañera cubana CCA-5000. Se utilizó la curva de variación de las cargas extremas que actúan sobre el cortacogollo, a partir de la evaluación experimental extensométrica en una pista de obstáculos del modelo de cosechadora KTP-2M, donde se determinaron los coeficientes dinámicos que se producen en el centro de masa de este órgano. Se utiliza el Método de los Elementos Finitos y a través del análisis dinámico lineal se determinaron las causas de las deformaciones plásticas aparecidas en el tubo inferior del paralelogramo del mecanismo cortacogollo durante las pruebas tecnológico-explotativas de la nueva cosechadora al aparecer tensiones de 219,3 MPa en el mismo, siendo el límite elástico del acero utilizado de 220 MPa. Se realiza el análisis de las modificaciones introducidas a la estructura, obteniéndose un coeficiente de seguridad de 1,36 para el nuevo modelo con un tubo inferior de sección rectangular, lo que asegura un comportamiento fiable del mismo durante la aparición de las cargas extremas en condiciones de explotación de la máquina.
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