Electric grease barrel pump

An electric grease barrel pump comprising:

• a pumping device for supplying grease;
• a driving device for driving the pumping device in multiple driving steps;
• a supply pipe to which the grease is discharged from the pumping device;
• a check valve installed in the supply pipe to prevent the grease from flowing backward to the pumping device;
• a distribution valve installed downstream of the supply pipe to selectively supply the grease to each attachment;
• an actuator for controlling operation of the distribution valve;
• a circulation pipe installed between the supply pipe and the pumping device to circulate the grease to the pumping device;
• a relief valve installed in the circulation pipe;
• a transmission unit;
• and
• a connection unit that enables the actuator to operate in conjunction with a change in the driving steps of the driving device,
• wherein the pumping device includes:
• a tank for accommodating the grease;
• a push plate that slides along an inside of the tank;
• a cylinder extending through a center of the push plate and having a flow path for the grease;
• and
• a piston shaft disposed inside the cylinder to supply the grease by moving up and down through an operation of a driving motor,
• wherein an agitation device is provided at a lower portion of the piston shaft,
• wherein the agitation device includes a blade that rotates as the piston shaft moves up and down, and
• wherein the piston shaft and the blade are coupled to each other by a worm gear.