The function of the hydraulic transmission system is to provide power for various actions requested by the technical process of the vertical injection molding machine, and to meet the requirements of pressure, speed, temperature, etc. required for various parts of the vertical injection molding machine. It is mainly composed of various hydraulic components and auxiliary hydraulic components, and the oil pump and motor are the power sources of the vertical injection molding machine. Various valves operate to control oil pressure and flow, thus satisfying various requirements of injection molding technology. The function of the hydraulic transmission system is to provide power for various actions requested by the technical process of the vertical injection molding machine, and to meet the requirements of pressure, speed, temperature, etc. required for various parts of the vertical injection molding machine. It is mainly composed of various hydraulic components and auxiliary hydraulic components, and the oil pump and motor are the power sources of the vertical injection molding machine. Various valves operate to control oil pressure and flow, thus satisfying various requirements of injection molding technology.