世间万物，什么东西都有它的作用，有的是与生俱来的，有的是我们人类后天根据需要发明创造的，很多的东西我们都没有见过，也没有听说过比如化粪池模具。

With the increase of cement engineering projects in foreign countries and general contracting projects, more and more cement pipes are exported.

With the rapid development of China's capital construction and technological progress, a large number of construction of the drainage pipeline project, for the roller to provide a broad market.

The use of variable frequency energy-saving technology is a key method for the transformation of cement pipe making machines. What do we need to pay attention to?