Compact Mid-frequency Heater KSO-T 400/4-C30 of output series 400 kW


The heater is used for induction heating of steel billets with circular or square-shaped cross-section up to forging temperature. The transistor frequency converter is built in the heater box thus the built-up space is saved and losses in MF cables are eliminated. Application of of transistors (IGBT) in the inverter of the frequency converter allows a better load tuning which is represented by parallel combination inductor - compensating capacitors. The same output of the converter can be achieved at a lower current and therefore with less losses. The total efficiency of the IGBT frequency converter is higher by ca 1 to 2.5% (depending on the operating frequency) compared to the converter whose inverter is fitted with thyristors.
The input mechanism enables either fully automatic or manual insertion of cold billets. The manual insertion is used for short billets which, in the automatic mode, are not able to be oriented in the right way.
In the automatic mode the operator puts the pallet with cold billets onto the pallet tippler bed. When the button is pressed the platform of the pallet tippler starts rotating and the billets are gradually poured out into the vibratory container. From it the cold billets are directed (one by one) onto the input conveyor.
In the manual mode the operator puts the billets directly from the palett to the above mentioned input conveyor. It moves the billets to the roller feeder which consists of a lower prismatic pulley and an upper pressure pulley. Both pulleys are driven and their speed can be set up on the communication panel.
The roller feeder inserts the billets into the inductor in a heating cycle. When one cold billet is pushed in, another heated one is pushed out of the inductor.
The inductor is connected with inlet and oulet cooling water by means of quick couplers which enables quick exchange for another type. It is not necessary to discharge the cooling water from the inductor into the sewer system and, thereby, the operating costs of the cooling are reduced. When the main switch is on, the inductor is automatically connected to electricity.
The heated billet is pulled out to the output conveyor by means of the separator. It is designed in a way to separate billets which are partly stuck. If the billet is not heated to the right temperature it is shifted with the flap among the overheated or underheated billets. If the billet is heated up to the right temperature it goes on along the outlet conveyor directly to the press.
The temperature of the heated billet is measured by a contactless thermometer UPF V. The output of the heater and the function of the heated billets separator are regulated according to the temperature value.
The induction heater is controlled by Programmable Logic Controller (PLC) made in Siemens. The operation is done from the control box with buttons and the communication panel. The heating parameters (required temperature, output, temperature limits in etc.) are set up on the communication panel. All failures of the heater are displayed in text on this panel.

Basic Technical Parameters KSO-T 400/4-C30

Heated Material magnetic steel
Billet Dimensions Ø D  [mm] 24 - 70
square (one side)D [mm] 30 - 60
Length l [mm] 0,7D - 300
Maximum Process Capacity [kg/h] 900
Billet Delivery Temperature [°C] max. 1300
Nominal input values (power circuits)
Power Input [kVA] 480
 Input voltage from separating transformer [V] 3 x 560
 Frequency [Hz]  50
Nominal input values (control circuits)  
 Power Input [kVA] 25
 Voltage [V] 3 x 400
 Frequency [Hz]  50
 Nominal output values
 Power [kW]  400
 Frequency [kHz]  1,3 - 4
 Nominal output voltage [V] 800

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