Booster cylinder: also named gas-liquid booster cylinder. It is designed according to the advantages of gas cylinder and oil cylinder. Oil and compressed air are strictly separated. Piston in the cylinder work automatically, quickly and stably after touching the working part. Cylinder body structure is simple;easy to adjust the force; can achieve the strong force of oil cylinder under the same circumstance; cost-efficient and will not damage mold due to soft landing;easy assembly and special booster cylinder can be assembled at any angle; occupies little room; seldom breakdown, so no worry about heating; long working life, low noise, etc.