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Rated power: 75KW+5% (1-100%) adjustable
Power supply: 380V, 3P, 50Hz
Rated temperature: 1200℃
Non-load furnace temperature rise speed: ≤2 hours
Control zone: 1 zone, independent temperature control
Effective working size: 1200×1200×600mm (L×W×H)
Overall size of the furnace: 2260×2100×1900mm(L×W×H), the height excludes the furnace door frame
The length when the bogie moves out of the furnace: 5100mm
Heating element connection: Y
Temperature uniformity: ±10℃
Temperature measurement accuracy: ±1℃
Non-load furnace power consumption: ≤18%
Temperature control method: SCR, PID regulator; SHIMADEN (JAPAN) temperature controller with 485 communication port; 10.1 inch touch screen which can record the historical data, storage technology, U disk export, screenshots and other functions, with overtemperature alarm
Furnace surface temperature rise: ＜45℃
Heating element: 0Cr27AL7Mo2
Bogie face plate: ZG35Cr24Ni7SiN heat resistant steel, 30mm thickness
Loading method: Product loaded on the bogie, and then bogie moves into the furnace
Furnace door opening method: 1ton Electric hoist up-down, sealed by the door self-weight
Bogie moving method: By 1.5KW cycloidal pin gear speed reducer
1. Application
The RT3-75-12 electrical bogie hearth furnace is mainly used for quenching, structural steel, cast steel, spring steel and tool steel.
2. Structural Introduction
The RT3-75-12 bogie hearth furnace is mainly comprised of furnace
body, lining, furnace door and door compression system, bogie, sealing
mechanism, heating element, temperature control system.
2.1 furnace body
The bogie hearth furnace body steel structure is made from 8-10# sectional
steel and ≥3mm steel plates. The side pillar and back pillars are made from
sectional steel, and are reinforced with sectional steel bracings. The external
wall of the furnace is painted with 2 layers of primers, and 2 layers of
coating paint. The key part of the furnace is painted with heat resistant paint.
2.2 lining
The car bottom furnace supplier is built with an all-fiber system. The lining
material used is quality aluminum fibers fixed by round steel parts. The
aluminum fibers are pre-compressed into blocks (compression gravity:
≥230Kg/m3 ) and then fixed to the furnace body by round stainless steel
parts. This refractory lining structure has the advantages of low heat
conductivity, strong anti-shock capacity, and anti-erosion. The lining has
a total thickness of 350mm. The silicate aluminum fiber resists a maximum
temperature of 1260℃.
2.3 furnace door and door up-down system
The high temperature bogie hearth furnace door is comprised of all-fiber
lining and steel structure casing. The door frame is made of 12mm steel plate.
The lining is built with high aluminum fiber blocks same as that for the furnace
body. The overall structure of the furnace maintains its shape while heated.
Driving method of door: The furnace door is electrically lifted upward and
downward by the electric hoist. And it is sealed by furnace door self-weight.
2.4 bogie and sealing mechanism
The bogie is comprised of bogie frame, wheels, refractory bricklaying body,
heat resistant bogie face plate and bogie driving mechanism.
bogie structure: the bogie frame is made from 12# beam and 12mm steel
plates. The bogie could work for a long time without deformation at full load.
wheel: The wheels are made from ZG55# steel casting. The transmission
shaft is made from 45# steel, and it is heat treated. The transmission bearing
is of the heavy type pillar bearing to bear the weight. There are a total of 4
of wheels, and each wheel is of diameter 240mm.
bricklaying body: The bogie is built with a combination of high alumina
refractory bricks, light refractory bricks, and heat preservation bricks. The
bricklaying body of the bogie has heating elements installation slot for easy
installation of the heating elements. The impacted parts and weight bearing
area are bricked especially with heavy type high aluminum refractory bricks.
There is also free space left for the refractory lining expansion when heated.
The strip shape bogie face plate is cast with ZG35Cr24Ni7SiN, 30mm. The
max temperature≤1200℃. It has long - term use without deformation and
cracking.
Sealing: The seal between furnace door and furnace body and bogie is more
important. The seal between furnace door and furnace body adopts furnace
door self-weight compression structure. The seal between bogie and furnace
body is seal of special-shaped brick, fiber cotton block and sand double seal .
2.5 heating element
heating element: The 0Cr27AL7Mo2 resistance corrugation shape alloy resistance
strips are mounted in two side walls. The resistance strips are produced through
special molds, and are installed in the furnace wall by porcelain nails. And there
is a porcelain gasket between the fiber wall and the resistance strips to avoid
short-circuit. The ceramic screws and gasket are made of high aluminum materials
sintered at high temperature to ensure adequate strength and service life. There
are 1 heating zone. All lead-out conductor bars are made of φ16 0Cr27AL7Mo
material.
2.6 electrical control system
Temperature control: the furnace adopts intelligent temperature controller to control
the temperature which has self-tuning function to calculate the ideal PID parameter
and achieve a temperature stability. The temperature controller has the functions of
over-temperature alarm and thermal couple breakage protection.
The furnace has 1 temperature control zone for controlling the linkage between the
temperature and the motor movements. Each zone is set with an over-temperature
alarm. The heating loop adopts the double-direction SCR and trigger control. The
power is regulated in the time proportional regulation manner.
The control actuation system is a large-power triggering one complete with a
radiator and an air cooling system. There is also an air switch. The heating loop is
equipped with ammeter, voltmeter, heating element on-off indicator, power-on
interlock protection, and safe earthing measures.
Movement control: The control system mainly controls the door up-down movement,
door compression, and door in-out movement. Also the movements are necessarily
linked to ensure the operation safety.
