由张芝泉申请的专利(公开号CN200942586,公开日期2007年9月5日)“销钉式冷喂料三复合液压机头橡胶挤出机组”的特征是机头锁紧机构分为上下2组,上面一组锁紧机构为2套水平对称布置机构,锁紧上机头和中机头;下面一组为2套倾斜对称布置机构,锁紧下机头。每套锁紧机构包括油缸、锁 Patents filed by Zhang Zhiquan (Publication No. CN200942586, Publication Date: September 5, 2007) The feature of the “pin-type cold feed three compound hydraulic head rubber extrusion unit” is that the head locking mechanism is divided into two groups of upper and lower, Group locking mechanism for the two sets of horizontal symmetrical arrangement, the lock on the head and the machine head; the following set of 2 sets of tilt symmetry arrangement, the lock head. Each locking mechanism includes cylinder, lock