Abstract:
In the positioning system for an operating cylinder (1), a valve or a set of valves (6; 10, 11) comprises means for allowing a free supply of hydraulic fluid from a pump fluid chamber (8) of a pump cylinder (7) into an operating fluid chamber (2) of the operat ing cylinder (1), for preventing the back flow of hydraulic fluid from the operating fluid chamber (2) into the pump fluid chamber (8) when the hydraulic fluid pressure on the control side (A) rises above a predetermined pressure limit, and for allowing a free back flow of hydraulic fluid from the operating fluid chamber (2) into the pump fluid chamber (8) when the hydraulic fluid pressure on the control side (A) goes below the predetermined pressure limit. An operating piston rod (3) follows closely the movement of a pump piston rod (9), and the valve or the set of valves (6; 10, 11) prevents pressure fluctuations from transmitting from the operating side (B) to the control side (A). The system can be used for instance in a hole-rotor- type barking machine (16) for positioning the operating cylinders of barking blades (17). The system can also be used for positioning the operating cylinders (1) operating the gripping jaws (19) of a hydraulic gripper (18) of a machine. Furthermore, the system can preferably be used for positioning the operating cylinders of pusher shafts, lift booms and articulated knuckle booms of a machine.
Abstract:
The present invention relates to a barking machine which comprises a frame (1), barking rotor (2), which is rotably mounted on the frame (1) and which barking rotor comprises a rotor frame (3), barking blades (4) mounted on the rotor frame (3), and a first power unit (5) mounted on the rotor frame (3) that is connected to the barking blades (T) for trnsferring the barking force into them. According to the invention in the barking rotor there is arranged an adjustment device (6) movable with respect to the rotor frame, and a second power unit (7) which is mounted on the frame (3) for transmitting the barking force via the first power unit (5) to the barking blades (4). This solution enables one to adjust the barking depth of the barking blades without stopping the barking rotor.
Abstract:
Un mécanisme à piston-cylindre (2) faisant partie d'un appareil actionné par la pression d'un fluide et connecté entre deux parties mobiles l'une par rapport à l'autre (1, 38), est conçu pour contrecarrer élastiquement le mouvement entre les parties (1, 38) dans au moins une direction. Un dispositif de pompage (8) est prévu pour mettre un fluide sous pression. Le dispositif de pompage (8) est conçu pour être actionné par le mouvement relatif des organes (1, 38) et faire monter la pression du fluide dans un accumulateur d'énergie (17). L'appareil comprend également un dispositif de régulation de fluide (9) prévu pour augmenter le volume et/ou la pression du fluide contenu dans le mécanisme à piston cylindre (2) en utilisant la pression la plus élevée du fluide dans l'accumulateur d'énergie.