POWER ANALYSIS OF THE MECHANISM OF THE PUMPING MOVEMENT OF THE EARTH NEEDLES OF BASIC KNITTING MACHINES

Abstract

Improving methods of designing technological machines mechanisms of light industry in CAD-programs. Methodology. Used vector algebra apparatus; analytical method for the force calculation of planar mechanisms  of  the  third  class  of  the  third  order  on  the  basis  of  the  method  of  vector  transformation  of coordinates; a numerical method for calculating the position functions of characteristic and singular points of a third-class third-order mechanism with rotating kinematic pairs.  Mathematical  models  were  obtained  describing  the  power  characteristics  of  the mechanism of the ear needles of a basic machine, based on the mechanism of the third class of the third
order with rotating kinematic pairs, in the form of force vectors (reactions) of the interaction of the links at the points of their contact and the constituent vectors of these reactions in the function of the leading crank. The vectors of the forces of interaction of the links at the points of their contact and the instantaneous and limiting values of the loads in the kinematic pairs of the flat six-link mechanism of oscillatory motion of the
ear needles of the basic knitting machine, based on the mechanism of the third class of the third order with rotating kinematic pairs, are determined; the maximum permissible diameters of the axes of the kinematic pairs of mechanism members in the CAD program are determined; defined moment that balances the forces acting on the link of the cast. Originality. The algorithm of analytical force study of the work of a flat six-link articulated lever mechanism of ear needles of a basic knitting machine synthesized on the basis of a third-class third-order
mechanism  with  rotating  kinematic  pairs  using  a  vector  algebra  apparatus  is  proposed.  Software  blocks have been created for the automated computer calculation of the radius vectors of the special points of the mechanism, the vectors of the tangential, normal, and the resultant forces of the interaction of the links at the points of contact in the CAD program. Practical Value is to use the results obtained in the design of third-class third-order mechanisms with rotary kinematic pairs and the dynamic study of similar target mechanisms of light industry machinery.