Thread variable-diameter injection head

The utility model relates to a thread variable diameter injection head, which comprises an injection head and an injection rod, the injection head is connected with the injection rod through an adapter, the outer wall of the adapter is provided with an external thread section, the external thread section is in threaded connection with the injection head, a cooling component is arranged in the injection head, and the adapter is used for connecting injection heads and injection rods of different specifications. The cooling assembly is used for cooling the injection heads, the injection heads of different sizes can be in threaded connection with the injection rods of the same size through the adapter, the enterprise cost is saved, and meanwhile the die casting efficiency is improved. 本实用新型涉及一种螺纹可变径压射头，包括压射头和压射杆，压射头与压射杆之间通过转接件连接，转接件外壁设置有外螺纹段，外螺纹段上螺纹连接有压射头，压射头内设置有冷却组件，转接件用于连接不同规格压射头与压射杆，冷却组件用于对压射头进行冷却，通过转接件可使不同尺寸大小的压射头与统一尺寸的压射杆进行螺纹连接，节约企业成本，同时加快压铸效率。