Hydric bell furnace has steel wire actor of quality of product of tall, anneal, medium and energy use up manufacturing efficiency low, reduce the advantage such as environmental pollution, it is improvement and a kind of when improve quality of steel wire product important equipment, the automation system of bell furnace is the key that makes sure equipment stability moves. The device that center of treasure steel technology is designed automatically and developed the hydric annealing furnace that overspread type and control system, it is a foundation with model of anneal process maths, the control that realizes anneal process control and furnace temperature, furnace pressure, safe protection. Moving result shows this automation system runs on the safe side, productivity is tall, and the function of product of anneal steel wire is mixed quality has bigger rise.

1 Process of anneal of the hydric annealing furnace that overspread type summarizes steel wire

Bell furnace equipment includes furnace station, inside cover, heat cover and cooling cover. Its process is as follows: Furnace station feed a machine, place inside overspread and the hand uses the fish trap inside impaction; Examine nitrogen and hydric entrance pressure ensure the system is safe; With the air inside the cover inside vacuumize means displacement, make content of the oxygen inside furnace reduces 1 ％ the following, good to connect protection to be enraged preparation (outside be being overspread inside, place heat cover, be overspread inside and heat combustion interval is between the cover) ; After be being finished with air of nitrogen vacuumize displacement, reoccupy protects gas displacement nitrogen, begin to add heat internal heat, implementation is protecting the anneal process below atmosphere completely; Of anneal process heat paragraph, soaking paragraph, protective gas decides time to blow sweep; Belt heat radiation is cover refrigeration, cooling; Take refrigeration to overspread refrigeration; With gas of the protection inside nitrogen displacement furnace; Steel wire gives heat. The graph is shown 1 times for graph of anneal of steel wire bell furnace. Among them temperature is the temperature of hearth ministry thermocouple.

Graph 1 Graph of steel wire anneal

2 Automation system is designed

According to steel wire the characteristic of craft of anneal of hydric bell furnace is mixed the need of anneal process automata, construction of system of automation of hydric bell furnace is shown 2 times like the graph.

Graph 2 Steel wire overspreads foundation of type annealing furnace to dominate systematic picture

Control system controls 2 annealing furnace that overspread type by a PLC, introduce the Profibus spot bus line of Siemens company, include S7 - 300 controller, distributed I/OET200 and OP operation face plate. The foundation controls unit (PLC) the control function of process of the anneal that finish and monitoring. Operation face plate (OP) the surveillance of process of the set of parameter of the anneal that finish, anneal and incident call the police of the record short when memory function. Should go up a monitoring computer breakdown when, the anneal that completes furnace stage alone by fundamental control system is operated and record data of corresponding anneal process. Electric ark has the spot to temperature shows and call the police and breakdown calls the police indication function.
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