根据实际生产中存在的问题，对2台DN80～1000mm管模内壁打点机的打点机构、托轮、托轮驱动装置进行技术改造。
The bracket wheel , bracket wheel driving equipment of two kinds of DN-100 mm pit-machiner for internal wall of pipe mould was conducted technological improvement aiming at the problems encountered in practical production .
打点机