CONTINUOUS TRAY PUSHER TYPE HEAT TREATMENT FURNACES
Wesman has a full range of Continuous Tray Pusher type Heat Treatment Furnaces up to a capacity of 10 MTPH to offer to the Automotive Castings, Forgings and other metal industries. These Heat Treatment Furnaces comprise of Tray Pusher type Hardening and Tempering Furnaces with Quenching facilities for polymer or oil as per the process requirement.
Trays loaded with material are charged on the hearth over side by side skid rails so that it can be pushed into the furnace by means of pneumatically/hydraulically operated pusher mechanism. Trays with material will be discharged at the opposite end of hardening furnace and will be placed over the cradle of the quenching system, which will immerse the charge tray with the material into the quench tank. After the quenching cycle is over, cradle will lifted up from the quenching tank and will be moved forward to the charge side of tempering furnace by means of electro-mechanical discharge roller conveyor. Trays with material, one by one, will again be charged on the hearth of the Tempering Furnace side-by-side so that it can be pushed from charging end to the discharging end by means of pneumatically/hydraulically operated pusher mechanism. Trays loaded with material one by one can be end discharged at the opposite end of the tempering furnace in the unloading area where the material can be unloaded by means of hoist or tilting mechanism or manually. The empty trays can be brought to loading area of the Hardening Furnace for the next cycle over conveyors.
The furnaces are fired with Wesman’s high efficiency burners supported by a full complement of combustion system consisting of combustion fan, atomizing fan, oil heating and pumping systems and/or gas trains. In addition auto ignition, flame failure safety and complete control systems are offered. Practically any type of liquid or gaseous fuel can be used viz. Furnace Oil, Light Diesel Oil, LPG and Natural Gas singly or a combination of any oil or gas in case of dual fired furnaces.
The Hardening Furnace is provided with Recuperator to improve fuel efficiency, the Recuperator will heat the combustion air up to 200 deg C and the pre-heated air will be supplied to the burners.
As an alternative, the furnaces can be offered with electrical heating through heat resistant Strip/Wire/Cartridge heating elements located along with the side/back walls/roof of the furnace. The heating elements of the furnace are suitably divided into number of heating zones with each zone of having their bank of heater. Each bank heater shall be connected either in STAR/DELTA or Parallel STAR/DELTA groups to have minimum number of heater per phase per group.
The Tempering Furnaces can be directly heated through Burners located behind stainless steel baffles. To allow uniform heating inside the tempering furnace and ensure sufficient circulation of hot air, suitably sized recirculation fan assembly will be provided. Baffles fabricated from stainless steel sheets of AISI-304 are installed to guide the recirculation of hot gas inside the furnace. These baffles are suitably anchored with heat resistant studs from sidewalls and roof.
The Hardening Furnaces are lined with high temperature grade ceramic fiber lining at the sidewalls and modules at the roof and door. The bottom hearth of the furnace is provided with combination of high alumina bricks backed by insulation bricks to minimize the skin temperature.
The Tempering furnaces can be of Double Wall construction with inner SS 304 and outer MS or with Cera board with back up ceramic fiber lining at the sidewalls roof and door. The bottom hearth of the furnace will be provided with combination of medium grade alumna bricks backed by insulation bricks to minimize the skin temperature.