Volume control actuator including non-contact cylinder

A volume control actuator including a non-contact cylinder, the volume control actuator comprising:

• an installation frame having a predetermined height and a predetermined size, with a first installation space and a second installation space being defined in an upper portion and a lower portion of the installation frame, respectively;
• a pressing cylinder vertically disposed on top of the installation frame to move a reciprocating rod in the first installation space by reciprocating stroke movements;
• a fluid pipe provided in the second installation space and connected to an installation plate to obtain a path through which fluid flows;
• and
• a rubber cylinder having both ends fixed to a top surface of the installation plate and one end of the reciprocating rod,
• wherein the rubber cylinder is provided in the first installation space so that the volume of the rubber cylinder changes in an expanding and contracting manner in response to the stroking of the reciprocating rod, thereby causing fluid in the fluid pipe to flow,
• wherein the rubber cylinder comprises:
• a bellows formed of a rubber material to change the volume thereof in an expanding and contracting manner in response to the stroking of the reciprocating rod, thereby causing fluid in the fluid pipe to flow;
• an upper joint connecting the end of the reciprocating rod and a top end of the bellows to transfer reciprocating movement of the reciprocating rod, which protrudes from and retracts into the pressing cylinder, to the bellows;
• and
• a lower joint connecting the top surface of the installation plate and a bottom end of the bellows, thereby fixing the bottom end of the bellows to the installation plate, and
• wherein the lower joint comprises:
• a plurality of fastening holes formed around the fluid pipe connected to the installation plate to be flange-coupled by the fastening members;
• and
• a lower coupling ring configured to tightly hold a flange therein, the flange being provided on the bottom end of the bellows, wherein the lower coupling ring is in tight contact with and integrally coupled to the flange of the bellows by the fastening members extending through and fastened to the fastening holes.