The knockout cylinder is an additional device of the hydraulic press machine. It is mainly used to punch down the punching waste during the punching process. Therefore, not all processing techniques require the installation of a feeding cylinder for the hydraulic press machine, which can be determined according to production needs.
                                                                           
The traditional knockout cylinder is a separate hydraulic cylinder installed in the upper slider, which seriously affects the rigidity and strength of the upper slider during the production process. Therefore, the hydraulic press machine needs to make the upper slider very high and the ribs thickened. This process increases the production cost; and because the traditional punching cylinder is installed in the slider, the operation is cumbersome, the installation efficiency is very low, and subsequent maintenance is also difficult.

Conclusion, the hydraulic press machine provides a new type of knockout cylinder. The piston rod of the knockout cylinder is installed on the piston rod of the main cylinder and is fixed by the flange of the cylinder mouth. The cylinder has a simple structure and is easy to operate. The knockout cylinder piston rod is installed on the piston rod of the main oil cylinder. The piston rod of the feeding oil cylinder reciprocates in the piston rod of the main oil cylinder to realize the feeding function, which not only reduces the production and maintenance costs of the equipment, but also has high material utilization rate and improves the efficiency of the hydraulic press machine.