Prokopenko D.P. Analysis and synthesis of some mechanisms with closed movable links of the kinematic chain. - Scientific studies on the rights of manuscripts.
Thesis for the degree of Candidate of Technical Sciences (Doctor of Philosophy) in the specialty 131 «Applied Mechanics» (13 - Mechanical Engineering). Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, 2020.
The object of the study is the regularity of the existence of mechanisms based on kinematic chains, closed by movable links containing rolling bodies.
The subject of research is mechanisms based on kinematic chains closed by movable links containing rolling bodies.
There is a whole class of devices in the form of concentric and eccentric unscathed bearings, friction and toothed planetary transmissions and other mechanisms. They consist of, or contain as a major part of, a closed system of rolling bodies. The development of methods for structural and cinematic analysis and synthesis of such mechanisms is a topical scientific and technical task.
The aim of the study is to analyze and synthesize at the level of circuits of new mechanisms on the basis of closed movable links, including rolling bodies, kinematic chains for support of arrow cranes, drive of hydraulic pumps and hydraulic flow meters.
The analysis of the possibility of the existence without tape-de-axial mechanisms on the basis of the closed movable links of the kinematic chain without kinematic slipping showed that the kinematic chain mechanism, closed rolling bodies without slipping with variable radius of curvature guides cannot be created, and the spike should be axially located.
In the study of the nature of the change in the cavity of the pump, an algorithm was developed, which makes it possible to determine the area of working chambers of the pump and, if necessary, to determine the regularity of its change in the geometric parameters of the mechanism.
The previously known problem of erecting masses in a tripartite axial mechanism such as "rolomate" to an input roller which moves flat-parallel and is determined, That the highest value of the combined moment of inertia occurs when this roller reaches a turning angle of 83 degrees.
The tape deformation process was simulated and it was found that during the strip excavation process, the tape changes its geometric dimensions so that the minimum and maximum length reaches a value of and , moreover, the tape performs its own independent movement and in one complete turnover of the input roller makes about 3 complete revolutions. Quantitative analytical estimates of tape deformation per roller rotation were constructed.
The proposed refined solution to the problem of determining the tensile strength of a flexible tape interacts with a roller in order to determine a normal reaction on the surface of the roller.
As a result of theoretical research, it was designed at the level of inventions, hydranass and flowmeter due to the condition of absence of friction in the contact of rolling bodies, use of a closed space for the arrangement of the support links, which are at the same time executive organs. The meter has a regularity of changing the angular velocities of the rollers from the change in the linear speed of the flow of the liquid.
An axial rolamite-type mechanism with three pairs of rollers is used for synthesis at the level of the invention of a hydraulic pump with justification for the rational arrangement of inlet and outlet windows and the possibility of simultaneously pumping two different liquids. For it, the pattern of changes in the volume of the working chambers has been determined. In the axial and peristaltic pumps, unlike other mechanisms of the type of rolamite, an electromagnetic device for driving the links in a closed space is proposed. Synthesized at the level of the invention, the original support of a rotatable arrow crane on the basis of a mechanism with closed movable links of the kinematic chain, in which conical rollers are used as support elements, and the separating ones - balls that are closed to the ends of the rollers, thus reducing the dimensions of the supporting surfaces, avoiding skid friction between the rolling bodies and contact of the rings by the ends of the rollers, made it possible to reduce the dimensions of the supporting surfaces and to avoid skid friction between the rolling bodies and contact of the rings by the ends of the rollers.
