DESIGN OF NEW AUTOMATED POWER SYSTEM OF HYDROSTATIC SUPPORTS

DOI:10.25140/2411-5363-2017-2(8)-49-56

Author:

Sakhno Yevhen, Chernihiv National University of Technology (95 Shevchenka Str., 14027 Chernihiv, Ukraine)

Sergey Ponomarenko, Chernihiv National University of Technology (95 Shevchenka Str., 14027 Chernihiv, Ukraine)

Korniiets Kateryna, Chernihiv National University of Technology (95 Shevchenka Str., 14027 Chernihiv, Ukraine)

Language: ukrainian

Annotation:

Urgency of the research. The development of technological systems requires the designers to automate the labour movement of machinery. Due to this there is a problem of automatic compensation of the gap in the pair "shaft-bearing" dynamic changes in the external load on the shaft simple design means Such design solution allows to compensate the displacement value in a short time and with high accuracy, thereby reducing the wear of the support cranks of the rotating shaft in the hydrostatic support.

Target setting. One of the directions of the effective functioning of the hydrostatic support is the automatic control of stiffness and bearing capacity without changing the geometrical parameters of the bearing. In this regard, there arises a problem of increasing operational parameters of the supports due to the improvement of constructive elements of the hydrostatic node using the new controller design stiffness.

Actual scientific researches and issues analysis. The problem of creating new power systems of hydrostatic supports are presented in some scientific papers. Thus, the vector field of velocities and static pressure in the well hydrostatic support are determined. The parameters of the motion of viscous fluid in the gap of the spherical support jet regulation and perspectives design of hydrostatic bearings for high speed machining of parts on machine tools are investigated.

Uninvestigated parts of general matters defining. There is a problem of improving the control system of the oil wedge compensation process in combination "shaft - slide bearing" appearing during designing of automatic shaft control systems for shifting loads. Its solution would allow to reduce the oscillation, the power load on the shaft and the wear of the support cervixes.

The research objective. The main objective of this work is development of theoretical approaches to the design of new power system of hydrostatic bearings for stabilizing the shaft during its displacement under load.

The statement of basic materials. To stabilize the gap in hydrostatic bearings it is proposed a new power system with a regulator of stiffness, which allows to control shaft displacement under different loads directly at the point of maximum displacement, that enables timely, automatic compensation of consumption of the lubricant in the support to increase its rigidity in moments of overload. In the proposed controller, there is a primary and secondary supply system of the working fluid to the bearing pockets from one pump. In the main supply system, the fluid is supplied to pockets of support and additional power system supports the flow of liquid coming through the holes made directly in the jumper of the bearing.

Conclusions. In the article theoretical bases of design of new power system hydrostatic bearings were given. The simulation of the process of working velocities formation of the fluid in the hydrostatic section of the support for additional supply of working fluid in pair "shaft-bearing" was done. The pressure force of the working fluid that occurs in the wedge-shaped gap of the bearing was defined. The dependences of liquid flow in the pocket of the hydrostatic support against displacement of the shaft under load and the amplitude of its oscillations was built.

Key words:

hydrostatic bearing, the power supply system, the fluid velocity

References:

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