On-line oil injection lubrication system for small-caliber cold pipe blank unit

An on-line oil injection lubrication system of a small-caliber cold pipe blank unit, comprising a pipe blank inner hole oil injection assembly, a pipe blank outer surface oil injection assembly and at least one intelligent oil supply assembly, wherein the pipe blank inner hole oil injection assembly partially stretches into a pipe blank to inject oil into an inner hole of the pipe blank, a roller used for rolling the pipe blank is disposed on a front portion of the pipe blank, the pipe blank outer surface oil injection assembly is located outside the pipe blank and is used for injecting oil to a contact portion of the pipe blank and the roller, the pipe blank inner hole oil injection assembly comprises a mandrel rod and a mandrel, the mandrel is disposed in the inner hole of the pipe blank, the mandrel rod is connected to the mandrel, an oil passage is formed in the mandrel rod, an oil outlet part is disposed at an end of the mandrel, the oil passage is communicated with the oil outlet part, the pipe blank outer surface oil injection assembly comprises a support, an oil injection ring is movably mounted on the support, an oil injection channel is formed in the oil injection ring in an axial direction, multiple nozzles are connected to a front end of the oil injection channel, the intelligent oil supply assembly comprises an upper industrial personal computer, a vector frequency converter and a hydraulic pump, the hydraulic pump is connected to an oil tank, and the upper industrial personal computer adjusts the quantity of oil supplied by the hydraulic pump to the pipe blank inner hole oil injection assembly and/or the pipe blank outer surface oil injection assembly through the vector frequency converter.