1. A continuous supply precision minimum quantity lubrication pump supporting different lubrication conditions, comprising a pump system, a gas source processor, a driving system, an oil cup, a water pump, a two-position three-way solenoid valve, a water tank and an emulsion storage tank;wherein the pump system comprises a pump body, an oil inlet cavity is formed in the upper side of the pump body, the oil inlet cavity is connected with two piston cylinders arranged in the pump body in parallel, a piston cylinder inlet is formed in the back side of each piston cylinder, a piston cylinder outlet is formed in the front side of each piston cylinder, the piston cylinder inlet is connected with a piston device, the piston cylinder outlet is connected with a pump body output hole through an oil passage connection horizontal hole on the lower side, the back side of the pump body output hole is connected with a water hole, the right side of the pump body output hole is connected with a pump body gas source inlet, a pump core is installed in the pump body output hole, the pump core is provided with a mixing cavity, double-ended helical guiding protrusions are distributed in the inner wall of the mixing cavity, the mixing cavity is axially hermetically connected with the water hole, a pump body overflow valve control hole is formed in the right side of the oil passage connection horizontal hole, and the pump body overflow valve control hole is connected with an oil passage overflow valve;
the driving system is fixed to the back side of the pump body through a connecting bolt, the driving system comprises a driving box body, and an inner groove cam, a cam shaft, a driving pinion and a stepping motor I, which are installed in the box body; the stepping motor I is installed and located through a motor fixing side plate on the left side of the driving box body, the driving pinion is installed in cooperation with a motor shaft of the stepping motor I, the inner groove cam is installed on the cam shaft and is engaged with the driving pinion, and two piston devices that alternately reciprocate are further connected to the inner groove cam for cooperation;
the water pump is installed in the driving box body and is sealed at one end by the box body, the water pump comprises a water pump body and a water pump end cover, the water pump end cover is installed on the left side of the water pump body to seal the other end of the water pump, a water pump input joint is connected to the back side of the water pump body, the water pump input joint is connected with a pump cavity through a water pump input port, the pump cavity is connected with a water pump output joint on the front side of the water pump through a water pump output port, a driving gear and a driven gear are installed in the pump cavity, the driving gear is located on the lower side of the driven gear and is driven by a stepping motor II, the pump cavity is sealed by a water pump sealing ring, the water pump output port is also connected with a water pump overflow valve control port on the upper side of the water pump body, the water pump overflow valve control port is connected with a water pump overflow valve, and a drain port is further formed in the left side of the water pump overflow valve control port;
the gas source processor is connected with the pump body gas source inlet through a bidirectional joint;
the oil cup is connected with the oil inlet cavity of the pump body through an oil cup joint; and
the water tank and the emulsion storage tank are connected with the two-position three-way solenoid valve, and the two-position three-way solenoid valve is connected with a water input joint of the driving box body.