The electrical resistance shaft furnaces are designed for the following heat treatments: tempering, annealing or other thermal processes requiring a maximum operating temperature up to 700 ° C.
The furnace body is made of profiled and sheet steel. In it is placed the thermal insulation on the inside of which is formed the heating (work) space. The furnace chamber is in the form of a shaft, on the entire surface of which are evenly placed electrical heaters and a heat shield made of fireproof steel.
The top of the furnace is closed with heat-insulated lid, on which is located the ventilation unit.
The drive of the cover is automatic and turning motion – manually by a lever system.
There is electrical interlock between the lid, the heating system and the fan drive.
The thermal insulation is made of chemically neutral and resistant to various gas environments light-weight refractory bricks, vacuum formed refractory elements, felts and mats and protective coatings.
The heating elements are made of new high quality resistance alloys and are arranged thoroughly over the whole surface of the furnace chamber.
Control of the temperature of the working chamber is carried out by a microprocessor programmable PID – temperature regulator, sensing the signal directly from a standard thermocouple.
Electrical switchboards are designed for power and control of the furnace with operating voltage according to the design and the control of the thermal processes. The electrical switchboards provide appropriate control and protection of the circuits and automation, providing the required security.
The electrical resistance furnaces and respectively the switchboards for powering and management work with three-phase mains voltage (380 V) – to power the load chain and 250 V for control circuits (command and protective circuits related to the safety).
Available furnaces of this type are made in accordance with the technical assignment of the client and in accordance with the requirements of the technology for heat treatment of the products.