Mô tả
The rotary hearth furnaces of the DH product line are optimally suited for continuous processes on a small floor space. They are designed for preheating processes such as the preheating of metal parts for forging or for preheating of moulds. Charging and discharging can, be done at one position – either by a person or fully automatic. The hearth rotates in pre-set segments individually reconciled with the workpart geometry. The rotational speed and rotational intervals can be defined by the control system or by manual switching.
The rotary hearth furnaces are specifically designed for the required throughput and charge dimensions. They are heated electrically or alternativelly gas-fired by means of powerfull gas burners. Subject to the temperature range these rotary hearth furnaces are equipped with or without air circulation.
- Tmax 1300 °C
- Tmax > 850 °C up to 1300 °C with radiation heating
- Tmax up to 850 °C with powerful air-circulation for better heat transmission onto the charge and to optimize the temperature uniformity in the low-temperature range
- Electrically heated:
- Wire heating elements in the furnaces ceiling
- Heating via SiC rods installed in the furnace ceiling for furnaces up to 1300 °C
- Gas-fired:
- Directly gas-fired: The burner fires directly in the furnace chamber
- Indirectly gas-fired: The burner fires in a radiation tube to avoid a direct contact between the charge and the burner exhaust gases
- Very compact design compared with continuous furnaces
- Designed for continuous operation at one working temperature
- Table diameter up to 6000 mm
- Additional water sealing between the rotary table and the housing for forced convection furnaces and directly gas-fired furnaces
- Table drive under the furnace provides for movement in defined segments or continuously
- Low-vibration movement of the rotary hearth
- Charging through a lift-door
- Actuation of rotary drive via foot pedal or external contact in case of automatic operation
- Additional service door on request
- Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
- Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
- Defined application within the constraints of the operating instructions
- Exhaust hood above the door opening for discharge of the warm exhaust air when door is open
- Charging aids for ease of loading and unloading
- Multi-zone control for uniform thermal profile during the cycle
- Protective gas connections
- Visualization of loaded positions on the human machine interface (HMI)
- Process control and documentation via VCD software package for monitoring, documentation and control
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