A Heat-preserving Open Riser Bush

摘要

#$%^&*AU2012101162A420121025.pdf#####Title: A Heat-preserving Open riser Bush Abstract The invention relates to a heat-preserving open riser bush, comprising an open riser bush body and a riser plug corresponding to the open riser bush body installed on said open riser bush body. The invention can avoid entering of the molding sand, ensure a regular size and shape of the cavity of the open riser, is beneficial for the open riser to feed the casting, and reduce the workload. 2_FIG. 1 2 FIG. 2