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The application relates to the technical field of machining, and particularly discloses a cutting method of a long-shaft part fixed-length cutting production line, the long-shaft part fixed-length cutting production line comprising a rack, a cutting machine, a first blocking mechanism and a conveying line, the first blocking mechanism comprising a mover, a first driver and a first baffle, the mover driving the first baffle to move, and the first driver driving the first baffle to move close to or away from the conveying line; the unloading mechanism comprising a turnover plate rotationally connected to the rack, and the conveying line comprising a roller conveying line, the roller conveying line comprising a plurality of rollers, the turnover plate being located between adjacent rollers and being capable of supporting the part; the method comprising the following steps: S1, end cutting of a base material; and S2, fixed-length cutting of the base material: the base material is conveyed to be blocked by the first baffle under the conveying of the conveying line, then the cutting machine is started, and the cutting machine cuts the base material to form a fixed-length part. The scheme is used to solve the problem of high labor cost in the prior art that manual transfer of the fixed-length cut part is needed.

This disclosure provides a dry cooler and a cooling system. The dry cooler includes a fan and at least two heat exchangers stacked along its height. Each heat exchanger includes a pipe and an air inlet. The pipe is disposed within the heat exchanger for supplying a first cooling medium. The top heat exchanger also has an air outlet, which communicates with the air inlet. The fan is disposed at the air outlet to drive external air from the air inlet to the pipe and then exhaust it through the air outlet. Thus, by increasing the heat exchange area vertically, the heat exchange capacity per unit area is increased, thereby meeting the heat dissipation requirements of high-power levels within a limited deployment space.