Developing a Stand for Evaluating Technical Condition of Volumetric Hydraulic Drives with a Hydraulic Loading Device

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Introduction. The article describes the test bench specialized software, developed for technical inspection of domestic and foreign volumetric hydraulic drives in repair enterprises and service centers. The results of bench tests using a hydraulic bench and software are presented. Materials and Methods For the application software development, G graphical programming language of the Laboratory Virtual Instrumentation Engineering Workbench (Lab- View) programming environment developed by the National Instruments Company has been used. The reliability of the results obtained has been confirmed by a series of bench tests of domestic and foreign volumetric hydraulic drives. Results. There has been developed and implemented new test bench software for the technical inspection of hydraulic drives of different models from domestic and foreign manufacturers in repair plants and service centers. The software is used to capture, process and store data from the sensors during testing, to calculate and output measurement data, to conduct nonlaboratory analysis of the testing process in graphical, textual and video formats, to calibrate sensors, and to store the test results in the electronic library system. The specialized software runs under the Microsoft Windows 7 x86 (32-bit) operating system and is installed on a personal computer of the hydraulic bench data processing unit. The developed software is characterized by the ergonomics of the user interface, the ability to control all the parameters of diagnosing the tested volumetric hydraulic drives. Discussion and Conclusion. Specialized software and the test bench permit high accurate monitoring of all technical condition parameters of the most common domestic and foreign volumetric hydraulic drives in accordance with the requirements of the manufacturers in the repair enterprises and service centers.

Section: Introductionunclassified

Developing the Test Bench Software for the Technical Inspection of Volumetric Hydraulic Drives

Senin

Ionov

et al. 2021

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The Assessment of the Limit State of the Vacuum Piston Type Dough Divider by Oil Consumption

Величко

Martynova

Иванов

2020

Introduction. Agriculture includes one of the branches of raw material processing, the final product of which is bread making. At the same time, the most complex operation in the technological chain of bread making is the division of the finished dough into billets of the same mass. This operation is performed by vacuum-piston type dough dividers. Under operating conditions, the service life of dividers is 30-40% lower than the manufacturer’s stated. In the technical documentation there is not point of the limit state of dividers, so they continued to be used with high costs of technological materials that determine the cost of the finished product. The purpose of the work is to determine the criterion for evaluating the performance of dough dividers and the limit value of the criterion. Materials and Methods. Evaluation of the technical condition of vacuum piston type dough dividers was based on the edible oil consumption of food line WP 32 (manufacturer AIMOL). To measure the mass of the consumed oil and the mass of the dough pieces, scales were used with an accuracy of ±0.1 g and ±1 g, respectively. Results. Based on the results of the analysis of the operation principle of dough dividers, the criterion of efficiency is called the oil consumption, which is responsible for the accuracy of weighing the dough through creating a vacuum in the suction chamber when filling gaps in the coupling of parts. When evaluating the technical condition of machines by manufacturing 300 test pieces configured for a mass of 500 g the maximum oil consumption is obtained equal to 218 g. According to the maximum oil consumption, the allowed oil consumption is determined to be 109 g. Discussion and Conclusion. It is established that at bakery enterprises, about 30% of used dough dividers have an over-extreme limit state and the accuracy in weighing the dough cannot be restored by increasing the oil consumption. However, starting from the oil consumption above the allowed value of 109 g, the machines need major repairs. The obtained values of the limit and allowed state of dough dividers are widely used in bakery enterprises to assess their technical condition.

Influence of Hydraulic Oil Brands on the Completeness and Accuracy of Diagnostics of Hydraulic Units of Russian and Foreign Production

Ionov,

Senin,

Zemskov

et al. 2023

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Introduction. Russian and foreign manufacturers of volumetric hydraulic drives recommend using hydraulic oils (working fluid) from certain manufacturers for their hydraulic units: Lukoil, Gazpromneft, Mobil, Hydrau Gard, SHELL, Total, etc. The oils have different physicochemical properties, because of different additive packages in their composition. However, changes in these properties during operation are a negative factor. In this regard, the physicochemical properties of the power fluid will affect the determination of diagnostic parameters, namely their accuracy and reliability. Therefore, when monitoring the technical condition of volumetric hydraulic drives in bench equipment, it is necessary to use hydraulic oil, with constant physico-chemical properties. To select power fluid for determining the parameters of diagnosing new and existing volumetric hydraulic drives of Russian and foreign production with a minimum error, it is necessary to conduct experimental studies. Aim of the Article. The study was aimed at determining the dependence of changes in the parameters of diagnosing new and operating hydraulic units of Russian and foreign production on the power fluid temperature. Materials and Methods. As power fluid there were used Hydraulic oils MGE-46B and SHELL TELLUS S2 V46 recommended by manufacturers for volumetric hydraulic drives НST-90, НST-112 and Danfoss Power Solutions 90-series respectively. During the experiment, the volume efficiency and torque of volumetric hydraulic drives were tested as diagnostic parameters. The tests were carried out on specialized bench equipment in accordance with the requirements (methodology) of the manufacturers. Results. Experimental studies presented in the article have shown that the changes in the temperature of the power fluid affect significantly the accuracy of the diagnosed parameters of hydraulic units under study. It was found that the power fluid SHELL TELLUS S2 V46 allows reliably determining the diagnostic parameters of new and having operating time domestic hydraulic units. Optimal temperature ranges equal to 60...69 °C were obtained for power fluid – MGE-46V when testing new and having operating time foreign hydraulic units Danfoss Power Solutions 90-series. Discussion and Conclusion. It has been found that the power fluid MGE-46B in optimal temperature ranges ensures the completeness and high accuracy of diagnosing new and having operating time hydraulic units of Russian and foreign production in accordance with the requirements of GOST 17108 and manufacturers. Therefore, this hydraulic oil can be used as a universal power fluid for monitoring the technical condition of various hydraulic units at repair enterprises.