The dynamic balancing of the drive mechanism for the roller forming unit with balanced drive is consideredin order to increase reliability and durability. Two dynamic balancing problems are solved in the simulation process of the drive mechanism balancing: the inertia forces balancing which applied in the masses centers of the motion links, and the torque balancing which reduced to rotation axis of the drive shaft, that arise from the inertia forces action.Wherein all kinematic characteristics of the unit forming trolleys are determined, the change functions of the kinetic energy for the unit each element and whole system, the inertia forces of the unit each element and the total inertia force, the total moment from the inertia forces action are written.The unit motion equation is compiled based on the Lagrange equations of the second-order, and the generalized force and moment on the drive motor shaft are determined.The drive mechanism imbalance is estimated by the maximum and root-mean-square values of the total inertia forceand total torque from the inertia forces action, the dimensionless coefficients, which express the root-mean-square values ratio of the total inertia force and inertia forces, that act on each trolley, and the root-mean-square values ratio of the moment from the inertia forces action of the whole mechanism and moment components from the inertia forces action of the individual elements.It is established that the best balancing of the inertia forces applied in the masses centers of motion links, and the torque balancing which reduced to rotation axis of the drive shaft, that arise from the inertia forces action, are observed at the cranks displacement angle value Δφ=90° for the roller forming unit with balanced drive. The work results may in the future are used to refine and improve the existing engineering methods for estimating the drive mechanisms of roller forming machines, both at design stages and in practical use.
An equation of motion of the manipulator is obtained taking into account the influence of the inertial component of each link of the boom system and the effect of the oscillatory movement of the cargo on the dynamic loads of the metalware elements and hydraulic drive elements. The influence of the simultaneous movement of the first jib section, the second jib section and the telescopic jib section on cargo oscillation, as well as the effect of cargo oscillation on dynamic loads that occur in the boom system and manipulator hydraulic drive elements, is determined.
For the purpose of increase of reliability and durability of roller forming installation the combined mode of back and forth motion of the forming cart on acceleration of the third order is calculated. Kinematic characteristics of the forming cart at the combined back and forth motion mode on acceleration of the third order are calculated. The design of the drive of installation in a type of the cam mechanism is developed and the cam profile for providing the combined mode of back and forth motion of the forming cart is constructed. Use in installation of the specified driving mechanism leads to improvement of quality of a surface to the processed concrete mix, reduction of dynamic loadings in elements of the driving mechanism, to disappearance of excess destructive loads of a frame design and, respectively, to increase of reliability and durability of installation in general.
The task of this paper is to research the simultaneous use of trolley and hoisting mechanism by the tower crane with a beam jib. To conduct research, a dynamic model of joint movement of mechanisms has been developed, which takes into account the main movement of drive mechanisms and oscillating movement of the load on a flexible suspension and links of mechanisms with elastic properties. A mathematical model of the motion of mechanisms is constructed on the basis of a dynamic model with the help of Lagrange equations of the second kind. For a specific jib system of the tower crane, dynamic calculations were performed using the developed mathematical model. According to the results of the calculations, a dynamic analysis of the joint movement of trolley and hoisting mechanism was carried out. The analysis revealed significant dynamic and energy overloads of mechanisms during transients (start, braking) and the presence of high-frequency oscillations in the links with elastic properties and low-frequency oscillations of the load on a flexible suspension. To reduce the overload of crane mechanisms in the areas of transients and eliminate oscillations during steady traffic, it is recommended to optimize traffic modes and develop drive control systems to implement the desired traffic modes.
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