Electric grease barrel pump with automatic shift function

An electric grease barrel pump comprising:

• a pumping device for supplying grease;
• a driving device for driving the pumping device;
• a supply pipe through which the grease is discharged from the pumping device;
• a check valve for preventing the grease in the supply pipe from flowing back toward the pumping device;
• a distribution valve installed at an end of the supply pipe in a discharging direction of the grease to supply the grease to any one of a plurality of grease supply targets;
• a magnetic switch installed at a movable portion of the distribution valve to output a signal for supplying the grease to a selected grease supply target of the plurality of grease supply targets according to an operating position of the movable portion;
• a recovery pipe installed between the pumping device and the supply pipe to allow the grease to be recovered to the pumping device;
• a relief valve installed in the recovery pipe;
• and
• a control unit for controlling an operation of the driving device to adjust grease discharge capability of the pumping device according to the signal of the magnetic switch,
• wherein the driving device includes an electric motor, and the control unit controls the driving device by adjusting an RPM of the electric motor in accordance with the signal of the magnetic switch,
• wherein the electric grease barrel pump is a single pumping structure that has an automatic shift function where the pump is configured to automatically supply the grease to the plurality of grease supply targets under different supply conditions.