Hydropneumatic Cylinder’s Diagnostic System Design
In the development and modernization of hydraulic drive mechanisms translates links are proven energy-saving hydropneumatic cylinders successfully used in heavy building and truck machines. Hydropneumatic cylinder is an energy-saving cylinder - device for storage and subsequent use of energy. The rod of the cylinder can be hollow and be connected with a piston chamber. This makes it possible to increase the internal volume. These chambers are filled with an inert gas - nitrogen. Rod end is connected to the pressure line, i.e. in stroke; hydropneumatic cylinder can operate as a normal ram. Energy saving system operates as follows. With retraction of the rod by applying pressure to the rod end of the cylinder or under the influence of external forces, the gas in the piston chamber of hydropneumatic cylinder is compressed, whereby there is accumulation of energy. Later, when lowering pressure from the rod end or reduction of hydropneumatic cylinder’s external force rod under the action of gas expansion is pushed, releasing the stored energy. Application of hydropneumatic cylinders in cyclic and continuous-cyclic action railway machines leads to reduction of fuel consumption and provide more uniform load on the engine and the hydraulic drive machine, which has a positive impact on the resource elements of the hydraulic transmission and diesel. A slight increase in driving efficiency can be expected by minimizing the time of the pumps at a maximum pressure of hydraulic motors during acceleration, working bodies and (or) the running of the machine equipment. Quality control of the technical state of hydropneumatic cylinders is only possible if the methods and diagnostic system are developed. For the development of this technique and diagnostic system creation: existing standards for testing hydraulic cylinders and accumulators have been analyzed; hydropneumatic cylinder’s diagnosis parameters have been selected, formulas for diagnosis parameters definition have been obtained; diagnosis algorithm has been developed; metrology equipment has been selected.