It is a force-increasing gas-liquid conversion device. Compressed air acts on the cylinder piston to generate thrust. It pushes the cylinder piston so that the oil pressure several times higher than compressed air acts on the pressure rod to generate thrust and realize the action of the mechanical device. It is generally used in conjunction with belt-type spindles for knife-making purposes.

The knife cylinder is a conversion device that can compress air and then generate thrust to push the cylinder piston. At this time, the oil pressure that is several times higher than the compressed air can act on the pressure rod to generate thrust to complete the knife action. The upper part of the knife cylinder is the air cylinder, and the lower part is the oil cylinder. The oil cylinder is connected with the oil cup, and the bottom of the oil cylinder is a pressure rod return cylinder. The working process is: the intake air in the upper chamber of the cylinder pushes the piston and pushes the piston in the cylinder downward, so that the oil in the cylinder can be compressed, and the pressure will increase exponentially to push the pressure rod to act on the main shaft. The intake piston of the lower chamber of the cylinder returns. At this time, after the return cylinder of the bottom hydraulic rod is turned on, the pressing rod returns to the initial position, so that the cutting action of the spindle of the CNC machining center is completed.

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