The utility model relates to the field of
blow molding auxiliary equipment, in particular to a hydraulic clamping and stretching device for an
extrusion blow molding hollow
machine. The cylinder body is fixedly connected with the mounting base, an oil cavity is formed in the wall of the cylinder body, oil
pipe joints are fixedly connected to the positions, located at two ports of the oil cavity, of the outer wall of the cylinder body, and cavities are formed in the inner walls of the two sides, close to the two ends, of the interior of the oil cavity; the end cover is detachably arranged at one end of the cylinder body; and the quick disassembly mechanism is arranged on the outer wall of the cylinder body and can quickly disassemble and replace the
extrusion piece. According to the elastic
collet chuck, the second ring frame can slide along the sliding groove by twisting the third ring frame, so that one end of the oil cavity is exposed, limiting on the inclined block is relieved, the inclined block and the
extrusion block are pulled out conveniently and rapidly to be replaced, and compared with a traditional elastic
collet chuck which needs to dismantle numerous
peripheral components during replacement, the elastic
collet chuck has the advantages that operation steps are greatly reduced, replacement time is saved, and replacement efficiency is improved. The equipment maintenance cost and the
downtime are reduced, and the production efficiency is improved.