Hydraulic unit with combined pneumatic/servomotor action and related use

A hydraulic unit with combined pneumatic/servomotor action, the hydraulic unit comprising:

• a servomotor;
• a pneumatic cylinder comprising:
• a pneumatic plunger configured to separate a lower pneumatic chamber from an upper pneumatic chamber,
• a pneumatic directional valve configured to direct compressed air into at least one of the lower pneumatic chamber and the upper pneumatic chamber, and
• a rod protruding out of the upper pneumatic chamber;
• a ball screw supported on rollers mounted on a bearing;
• a hydraulic pump comprising a hydraulic sleeve and a hydraulic plunger located inside the hydraulic sleeve;
• an oil reservoir;
• an upper check valve located between the upper hydraulic chamber and the oil reservoir;
• an upper sensor configured to detect a position of the pneumatic plunger;
• a hydraulic pressure accumulator;
• and
• a pressure sensor configured to detect an oil pressure in the hydraulic pressure accumulator;
• wherein the ball screw is configured to receive torque from the servomotor, wherein the hydraulic plunger is configured to be displaced based at least in part on a pneumatic force of the compressed air and a force generated by the torque received from the servomotor, thereby drawing oil from the oil reservoir into at least one of a lower hydraulic chamber and an upper hydraulic chamber and further into the hydraulic pressure accumulator.