EXPERIMENTAL INDICATOR COUNTER FOR ESTIMATING THE TECHNICAL STATE OF A HYDRAULIC DRIVE PUMP BY AMPLITUDE-PHASE METHOD

Abstract

Currently, the serviceability of hydraulic drive pumps is evaluated only with resource diagnostics by the static-parametric method according to GOST 29015-91, GOST 14658-86. In order to improve the process of diagnosing a hydraulic drive pump, in addition to the static-parametric method, it is recommended to use the method of amplitude-phase characteristics. (Research purpose) The research purpose is in analyzing the current regulatory documentation and develop an experimental prototype of a diagnostic indicator counter that allows assessing the technical condition of hydraulic pumps by the method of amplitude-phase characteristics and resource indicators for work cycles. (Materials and methods) There were conducted an analysis of GOST on the problems of diagnosing hydraulic drive units to determine the possibility of assessing the technical condition, performed experimental studies to control the operation of the gear pump at the KI-28256 stand. (Results and discussion) The article presents the justification of the diagnostic process carried out and contradictions in the design of tractors and the existing NTD and GOST identified. The article proposes the option of using indicator counters when upgrading tractors as a system of built-in online diagnostic tools. A microprocessor-based programmable device of the AVR series was used to develop an experimental sample of an indicator counter. An experimental installation based on a hydraulic stand KI-28256 with a hydraulic pump NSH-32 was created for conducting field tests in the conditions of FNAC VIM. (Conclusions) The use of the developed prototype of the counter-indicator made it possible to increase the efficiency of the diagnostic process, to assess the level of hydraulic drive loading, to identify the level of expenditure of the assigned resource. The developed prototype of the indicator counter can be used as a separate diagnostic device used for quality control of repairs, and as a built-in diagnostic tool as part of the online diagnostics system of technical condition.