Due to the simulation and analysis of different switching mode, it is demonstrated that the pressure is lower with the decentralizing switch than with the centralizing one along the width of furnaces.

By the simulation and analysis of different switching mode, it is demonstrated that the pressure is lower with the decentralizing switch than with the centralizing switch.

The application of overall dispersal reversing technology has more advantages than the centralize dispersal reversing technology, such as better continuous production, effective control of the furnace pressure, low waste of gas with double preheating, adjustment flexibly, realization of automatic control easily, and the preferably result in practical producing is acquired.

The series of reformations is introduced, which have been applied to original walking-beam bottom furnace with distributed changing-direction controlled heat-regeneration to raising the heating power in Wire Plant of Han Steel.

The operational principal of a double-regenerative heating furnace is first introduced and a distributed switching control method is recommended.

And the design of the feed system,cavity and core,side parting and core-pulling mechanism were stated in detail.

Through the design of the injection mould for yarn-doubling pipes,the methods for deˉsigning the side parting structure and the reverse guide mechanism are introduced.

Since the mould requires core pulling on four directions,various side parting mechanisms have been used and are mainly introˉduced.