Automatic oil injection lubricating device of hanging expansion machine

The invention provides an automatic oil injection lubricating device of a hanging expansion machine, and relates to the technical field of hanging expansion machines, the automatic oil injection lubricating device comprises a push rod, an oil transportation expansion rod and an oil separator, the oil transportation expansion rod is connected to one end of the push rod, one end of the oil transportation expansion rod is connected with a switching rod, and one end of the switching rod is provided with an expansion head through a bolt; a first oil conveying groove is formed in the oil conveying expansion rod, a second oil conveying groove is formed in the inner side of the adapter rod, a third oil conveying groove is formed in the bolt, and the first oil conveying groove, the second oil conveying groove and the third oil conveying groove are communicated. The oil conveying expansion rod is pushed through the push rod, so that the adapter rod and the expansion head move and extend into the copper pipe for pipe ex