Grading oil drainage adjusting system, hydraulic system and hydraulic mechanical equipment

The invention discloses a graded oil drainage adjusting system, which relates to the technical field of hydraulic control systems, and comprises an oil way system, and the oil way system can be communicated with an oil tank through an oil pump and comprises an oil cylinder piston cavity oil way and an oil cylinder rod cavity oil way; the oil cylinder piston cavity oil way is communicated with a piston cavity of the working oil cylinder; the oil cylinder rod cavity oil way is communicated with a rod cavity of the working oil cylinder, a first pressure cartridge valve is arranged on the oil cylinder rod cavity oil way, the first pressure cartridge valve is further provided with a throttling rod, and the opening size of the first pressure cartridge valve can be adjusted so as to adjust the oil passing amount; the first pressure cartridge valve is further connected with a control oil way in parallel, a throttling valve is arranged on the control oil way, and the oil passing amount of the control oil way can be ad