Ang net changing device on the net changing device body, skateboard, high temperature oil cylinder, heater, net changing device for filling butane, fluorine, chlorine, carbon dioxide and other gases products easy to produce explosive material, leakage, leakage glue and other special design, the sealing parts are made of special alloy steel, after quenching and tempering, nitriding, grinding and other multi-channel processes, special processing, integrated structure, to avoid deep fried material, material leakage, leakage, etc., products for production is not interrupted, changing the net is simple and more than four net net changing workload reduction, 90%, is one of the four cyclic net changing device upgrade replacement products, especially suitable for XPS Extrusion board, pearl cotton products production.