Machine regulation volume hydraulic drive with reciprocating motion of hydraulic motors

This paper deals with the regulation of hydraulic parameters of movement of the output link (total stock) speed-load V = f (R) when using multiple cylinders, with a hard or serial connection rods. The required speed of movement is performed by connecting the required number of effective working areas of hydraulic cylinders. Change in the effective speed while maintaining the load may lead to changes in pressure in the cavity involved in the work of the hydraulic actuator. Control parameter - the relative magnitude of the total effective working area of the piston cylinder involved in the reported time in the work, to the sum of the effective areas of the piston, available as part of the hydraulic drive. With the change (eg, decrease) of the speed of common stock in accordance with the change (increase) of the effective working area of the connected cylinders surmounted total load power can be increased at an aggregate stock at discharge pressure, if the permissible one is not exceeded, ie there is the opportunity to work with a constant power hydraulic drive. The total value of the load can be much more than you can overcome with one cylinder without increasing the total amount of pressure in the system with a corresponding change in speed while maintaining a given flow rate. The set of 7 relative performance curves = f (VL) in the relationship of piston areas 1: 2: 4 of the three hydraulic cylinders is 7 straight lines of varying length.