CODEN(USA): JSERBR Development of a Multi-functional Hydraulic Test Stand

Kamel Elshorbagy, Hamdy Kandil, Mina Latif
2018 Journal of Scientific and Engineering Research   unpublished
This paper reports the details of the development of a hydraulic test stand. The hydraulic and control systems of the stand are designed to be used as a multi-functional test rig; it can be used as a teaching unit to recognize the function of the electro-hydraulic system main components, in addition to testing positive displacement pump units, directional control valves, flow control valves, check valves and hydraulic cylinders from different manufacturers. Also it can be used in research and
more » ... velopment of hydraulic circuit and its components. Economic considerations were taken into account during the design phase of the stand. As a test rig, the stand represents an electro-hydraulic system including various hydraulic and electric components. Different measuring devices for measuring pressure, temperature, oil level and rotating speed are built in and used in the stand. A PLC based control system is used for controlling and running specific test operations. Experimental procedures for testing an external gear pump and a double solenoid-operated 4/3 directional control valve in addition to test results are presented and discussed. 1. Introduction Hydraulic systems are used wherever high power and high forces are required. Hydraulic drives, thanks to their high power intensity, are low in weight and occupy a small mounting space. They facilitate fast and accurate control of very high forces. The increase interest in automation makes it even more necessary for pressure, flow rate and flow direction in hydraulic systems to be controlled by means of electrical control systems. The combination of these advantages opens up a wide range of applications for hydraulics in mechanical engineering, vehicle construction, industrial product lines and aviation. So, it is necessary to study performance of hydraulic components for improved employment in practical systems. The development of hydraulic test stands for testing hydraulic equipment attracted the attention of many researchers in different countries. For example, Salah and Kassem [1] developed and manufactured a universal hydraulic test rig for testing proportional and servo valves and cylinders. The rig can also test other types of hydraulic valves and motors. The drive and control systems of the rig are designed to match almost all the available types of valves of different sizes and cylinders of different diameters from different manufacturers. They also developed a PLC program which allows supplying the valve under test with the electric input signals required for the testing process. The pump delivery pressure and flow are remotely controlled. The electronic output signals of the flow meters and pressure transducers are displayed during valve testing and also processed to an IBA process data acquisition system for on-line graphical presentation of the measured variables and off-line analysis of the recorded results. Markonda and Vasava [2] presented a design of hydraulic test rig to test directional control valves and to measure the pressure drop through them at different flow rates. Successful simulation of the pressure drop in a directional control valve (NG6) against flow rate has been done using FLOED module which is supported by CATIA software. The module provides a good flexibility for the simulations and also in obtaining the results in