Abstract
The basis of every hydraulic system is based on energy transformations, which are realized through hydraulic working fluid. Hydraulic oils are certainly subject to changes within their structure, meaning the basic characteristics and parameters of hydraulic oil, such as density, viscosity, humidity. The oils that are exploited are exposed to the process of degradation, which largely leads to significantly poorer quality of hydraulic fluid. The paper deals with the influence of changes in the characteristics of the hydraulic fluid on the hydraulic operating parameters of the gear pump installed on the hydraulic press. The parameters refer to pressure, flow, and temperature, as well as the quality of hydraulic oil, which affects the volumetric efficiency of the pump, and the results presented in the conclusion are based on the measured values of parameters before and after corrective measures. The control of parameters aims to increase the efficiency and reliability of the hydraulic system, a way of modern detection of deviations of parameters from standard, required values.
Highlights
The parameters refer to pressure, flow, and temperature, as well as the quality of hydraulic oil, which affects the volumetric efficiency of the pump, and the results presented in the conclusion are based on the measured values of parameters before and after corrective measures
Considering that on the example of this gear pump, the gear fits according to standards and tolerances, the volumetric efficiency is determined based on leaks on the sealing elements of the pump chamber. Hydraulic systems and their components require clearly defined operating conditions, and the reason for this is the sensitivity of the components to any changes in conditions within the system
A large percentage of failures of hydraulic components are caused by hydraulic working fluids, which degrade over time and with partially unsuitable operating conditions, and their quality does not correspond to standard oil classes
Summary
Condition Based Maintenance compared with other maintenance strategies is considered a more efficient way to reduce maintenance costs. According to [25], density and viscosity are the main parameters that affect the pressure losses within a hydraulic system and increase the system’s inefficiency, and question the reliability of the system and its operation When it comes to hydraulic presses, the focus of the problem is on the drive elements, pumps, valve controls, and the system’s working fluid. Torrent et al [33], described in their paper the definition of volumetric efficiency through pump torque The importance of this type of diagnostics is reflected in the precise assessment of the state of the system, and especially the working fluid as an energy carrier, and not based on sampling, testing can be performed further prediction of behavior, based on working conditions and parameters. In the segment of parameter testing methodology, the steps of the approach to testing the hydraulic system of the press are described
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