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Rated power: 380Kw+5% (1-100%) adjustable
Power supply: 380V, 3P, 50Hz
Rated temperature: 1200℃
Control zone: 3 zones
Effective working size: 3500×1600×1600mm (L×W×H)
Heating element connection: Y
Temperature uniformity: ≤ ±10℃
Temperature measurement accuracy: ±2℃
Non-load furnace power consumption: ≤18%
Temperature control method: SCR, PID regulator; Guolong temperature controller with overtemperature alarm;
Furnace surface temperature rise: ＜50℃
Heating element: 0Cr27AL7Mo2 (strip)
Bogie face plate: Ni7N, 30mm thickness, heat resistant steel
Loading method: Product loaded on the bogie, and then bogie moves into the furnace
Furnace door opening method: Electric hoist up-down, sealed by spring
Bogie moving method: By the reducer
Bogie driving power: 4KW
Furnace lining: High temperature Refractory fiber
1. Application
The RT3-380-12 electric bogie heat treat furnace is mainly used for heat treatment of steel structure parts, cast steel parts, shaft bar parts, tool steel products, etc.
2. Structural Introduction
The RT3-380-12 bogie hearth furnace is mainly comprised of
furnace body, lining, furnace door and door compression system,
bogie, heating element, and temperature control system.
2.1 furnace body
The wholesale car bottm furnace body steel structure is made
from 8-12# 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 annealing bogie hearth furnace body 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 1360℃.
The material of round steel fixation parts is 1Cr13.
2.3 furnace door and door up-down system
The tempering car bottom furnace door is comprised of all-fiber lining and steel
structure casing. The door frame is made of 10mm steel plate and 12mm sectional
steel. The door is built with silicate 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 hoist. And it is sealed by spring.
2.4 bogie
The bogie is comprised of bogie frame, wheels, refractory bricklaying body,
heat resistant bogie face plate, heating elements, and bogie driving mechanism.
bogie structure: the bogie frame is made from 14# 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 3 pairs of wheels,
and each wheel is of diameter 300mm. The bogie is motorized. And the driving motor
is equipped with a braking speed reduction device to relieve the inertia at the start-up
and stop movement. There are 2 limit switches to avoid over-travel of the bogie.
bricklaying body: The bogie is built with a heavy 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.
bogie face plate: 30mm thick Ni7N heat resistant steel casting part with max working
temperature≤1200℃. It can prevent scales from falling into the heating elements slot
which would form a short circuit.
bogie moving mechanism: The bogie has a self-moving method. The reducing gear
drives the bogie wheel to move. The bogie movement is smooth and stable.
Sealing among furnace door, furnace body and bogie: Sealing between the furnace
door and the furnace body is through spring. The sealing between the bogie and the
furnace body is through soft special shape bricks and fiber cotton block.
2.5 heating element
heating element: The 0Cr27AL7Mo2 resistance spiral-shape alloy resistance strips
are mounted in 2 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. There are 3 heating
zones. All lead-out conductor bars are made of φ16 0Cr27AL7Mo2 material.
2.6 electrical control system
Temperature control: the furnace adopts Shanghai Guolong 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 3 temperature control zones 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.
