Hydraulic oil circulation cooling system of drilling machine

The invention relates to a hydraulic oil circulation cooling system of a drilling machine. The hydraulic oil circulation cooling system of the drilling machine is characterized by comprising an oil returning pipe device; the oil returning pipe device comprises a square pipe and a seamless steel pipe arranged on the inner side of the square pipe; an inner hole of the seamless steel pipe is a hydraulic oil channel; a slurry channel is formed between the seamless steel pipe and the square pipe; one end of the square pipe is connected with a slurry pump through a slurry pipeline; an outlet in the other end of the square pipe is connected with a water flow channel; one end of the hydraulic oil channel is connected with an oil tank through an oil pipe; the other end of the hydraulic oil channel is connected with an oil outlet of an oil radiator device through an oil pipe; and an oil inlet of the oil radiator device is connected with an oil storage tank. A drainage plug is arranged on the lower portion of the square pipe. The oil radiator device is a wind radiator and comprises a gear motor, blowing fan blades and a radiator. Water supplied by the slurry pump is effectively utilized to flow into the oil returning pipe, high-temperature oil inside the oil returning pipe is cooled along with water flow, and on the premise of not increasing the cost, the oil cooling efficiency is greatly improved.