Compact Mid-frequency Heater KSO 1200/1,2-C50 of output series 1200 kW

Compact Mid-frequency Heater KSO 1200/1,2-C50 of output series 1200 kW

The heater is used for induction heating of steel billets with circular or square-shaped cross-section up to forging temperature. Two thyristor frequency converters with the output of 630 kW are built into the heater box. Thereby the space is saved and the losses in MF cables prevented. Actually, heater KSO 1200/1,2-C50 is a serial arrangement of two 630 kW heater modules with their common control and cooling. For the outputs from 600 to 1200 kW the first module is the preheating one and the second module the upheating one. When heating a small amount of material where the output to 630 kW is sufficient, only the second module can be used. In this way both the efficiency and input power factor improve and scaling and decarburization of the heated steel are reduced, compared to the variety of one 1200 kW module.
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 inductors are 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 inductors into the sewer system and, thereby, the operating costs of the cooling are reduced. When the main switch is on, the inductors are 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 1200/1,2-C50

Heated Material magnetic steel
Billet Dimensions Ø D  [mm] 80 - 160
square (one side)D [mm] 80 - 160
Length l [mm] 1,1D - 500
Maximum Process Capacity [kg/h] 3000
Billet Delivery Temperature [°C] max. 1300
Nominal input values (power circuits)
Power Input [kVA] 800 + 900
 Input voltage from separating transformer [V] 3x625 + 3x625
 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]  600 + 600
 Frequency [kHz]  0,4 - 1,2
 Nominal output voltage [V] 900 + 900

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