| Popis: |
Special and general ground machines including those intended for road-construction, industrial, forestry, agricultural, land-reclamation, etc. works are equipped with a hydraulic drive of working attachments. During the technological operations, the hydraulic drive of working attachments ensures an increase in the speed and evenness of positioning control of the machine and the working attachments, optimizes the force action on the working attachments, facilitates operator’s work, enhances machine performance and reduces operating costs. Destruction of high-pressure hoses and the unauthorized discharge of hydraulic fluid into the atmosphere should be considered as the weak points of the hydraulic system of machines. Therefore, the work aimed at optimizing the working pressure and the physicochemical properties of hydraulic fluid as well as at creating technical means of hydraulic drive protection has been performed. Attempts have been made to use environmentally compatible hydraulic fluids, which do not contribute to environmental pollution when machines are operated. Works, which are focused on the improvement of flexible high-pressure hoses, metal pipelines and their hinged connections as well as the methods and systems of pipeline protection are in progress. It has been found out that flexible high-pressure hoses or pipeline protection methods do not solve the problem of environmental protection against discharges of hydraulic fluid into the atmosphere to the full degree. The use of organic hydraulic fluids increases the operating self-cost, and the optimization of the working pressure in a hydraulic system reduces machine performance. |
