Needle cylinder piston structure for high-pressure injector

The needle cylinder piston structure comprises a piston head, a push rod, an installation groove, a sealing rubber ring and a plurality of sets of fixing mechanisms, the piston head comprises a conical part, an installation part and a cylindrical part, and the conical part, the installation part and the cylindrical part are sequentially and fixedly connected into a whole. And a connecting groove is formed in one side, far away from the conical part, of the mounting part. According to the needle cylinder piston structure for the high-pressure injector, the cylindrical part is used for connecting a push rod, the mounting groove is formed for mounting and connecting a sealing rubber ring, and under the action of a plurality of groups of fixing mechanisms, when the push rod is connected, a circular truncated cone part pushes a locking rod to be connected into a locking hole, so that synchronous locking and fixing of a second clamping block, a first clamping block and the sealing rubber ring are realized; the need