What are the structural components of the stepping medium frequency induction annealing furnace?

The stepping medium frequency induction annealing furnace for heating large steel rods is mainly composed of an inductor, a stepping mechanism, a thermal insulation cover and a homogenizing chamber.

Sensor: Use 16mmx16mmx3mm pure copper tube to wind into three large inner diameter coils. The copper pipe is covered with an insulating layer and is cooled by water during operation. There is a heat-resistant sleeve inside each coil, and the heavy-filled aluminum silicate fiber felt between the two is insulated, and the permanent end plate and tie rod bolts form a whole. Three inductors are powered in parallel and arranged at one time.

Each inductor is equipped with 4 pieces of steel rods, and one piece of material is fed every 1 minute. The total heating time of the steel rods is 12 minutes. There is a space of two rod lengths between the two inductors. A stepping mechanism is installed to support the movable guide rail and allow the steel rod to have a soaking time of 4 minutes. The long distance between the sensors is beneficial to heating and temperature uniformity, but it brings difficulties to the design and layout of the stepper mechanism. The movable guide rails are prone to bending because they carry many steel rods, hindering the feeding of materials. The first inductor has fewer turns and higher power, and quickly heats the steel rod to about 900°C; the second and third inductors have more turns and lower power, and continues to heat the steel rod to 1150°C. This sequential induction heating heats up quickly and has high efficiency, which is beneficial to reducing the radial temperature difference of the blank.

Stepping structure: two pairs are fixed, and the movable guide rails are made of heat-resistant stainless steel pipes, which are cooled by water during operation. The support frame is welded with section steel. The stepping structure adopts hydraulic transmission. One hydraulic cylinder makes the movable guide rail rise and fall, and the other hydraulic cylinder makes the stepping mechanism move forward to a material cabinet, which is controlled by interlocking of the stroke limit switch. By adjusting the switch position, blanks with a certain length range can be sent. The feeding and shooting time is controlled by a time relay. By changing its setting value, the blank heating temperature and production efficiency can be adjusted. A blank is fed 16 times step by step and passes through all sensors to complete heating.

Furnace frame: made of welded steel, with sensors, stepping structures and operation control stages installed on it to form a whole.

Thermal insulation cover and equalization chamber: Set the thermal insulation cover between the two sensors. Reduce heat loss during the heating process of the blank. An equalization chamber is installed at the discharge end of the third inductor to reduce the radial temperature difference of the blank. Both are made of military steel plates and lined with aluminum silicate fiber felt on the inside.