Compound pipe oil tank device

The utility model provides a compound pipe oil tank device is applied to the pressure boost of bimetal pipe hydraulic forming machine owner hydraulic cylinder, including the frame, the lower extreme of frame is main hydraulic cylinder, and the upper end is the oil tank, and it has inlet port, oil drain port, oil inlet and overflow mouth to open on the oil tank, and the inlet port is being connected through defeated oil pipe and is being ended the on -off valve, is connected to main hydraulic cylinder by the on -off valve, one -way electromagnetic on -off valve is being installed to the oil inlet, one -way electromagnetic on -off valve with be connected the industrial computer by the equal electricity of on -off valve. This oil tank device is through the overflow, the oil absorption, the oil extraction return circuit, an one -way electromagnetic on -off valve has realized the oily automatic cycle of oil tank, and flow back when needs to hydraulic pressure and stand, one -way electromagnetic on -off valve only