1200 Degree Celcius Electric Bogie Hearth Heat Treatment
Furnace Car Bottom Type for Metal Cast Steel Parts
1. Application
The RT2-260-12 electric bogie hearth furnace is mainly
used for heat treatment of steel structure parts, cast steel parts,
shaft bar parts, tool steel products, etc. The heat treatment furnace
is widely used for quenching, tempering,normalizing, annealing, and other
processes.
2. Main Technical Parameters
| No. | Item | Technical Parameters |
| 1 | Rated power | 260Kw+5% (1-100%) adjustable |
| 2 | Power supply | 380V, 3P, 50Hz |
| 3 | Max working temperature | 1200℃ |
| 4 | Control zone | 2 zones |
| 5 | Effective working size | 2500×1500×1200mm(L×W×H) |
| 6 | Heating element connection | Ｙ |
| 7 | Temperature uniformity | ≤±10℃ |
| 8 | Temperature measurement accuracy | ±2℃ |
| 9 | Empty furnace power consumption | ≤18% |
| 10 | Temperature control method | SCR, PID regulator; Guolong temperature controller with overtemperature alarm; |
| 11 | furnace surface temperature rise | ＜50℃ |
| 12 | Heating element | 0Cr27AL7Mo2 (strip) 5-wall heating |
| Bogie face plate | G30, 35mm thickness, heat resistant steel | |
| 13 | Loading method | Product loaded on the bogie, and then bogie moves into the furnace |
| 14 | Furnace door opening method | Electric hoist up-down, sealed by spring |
| 15 | Bogie moving method | By the reducer |
| 16 | Bogie driving power | 4KW |
| 17 | Furnace lining | High temperature zirconium aluminum refractory fiber |
3. Structural Introduction
The RT2-260-12 furnace heat treatment for metal 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 body steel structure is made from
10-12# sectional steel and ≥3mm steel plates.
2.2 lining
The wholesale car bottm furnace body is built with an all-fiber system. The
lining material used is quality zirconium containing 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 370mm. The silicate aluminum fiber resists a maximum
temperature of 1260℃. The material of round steel fixation parts is 1Cr13.
2.3 furnace door and door up-down system
The car bottom furnace door is comprised of all-fiber lining and steel structure
casing.
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 10mm 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 2 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 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, back wall, furnace door and bogie bottom. 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 2 heating zones. All lead-out
conductor bars are made of φ16 0Cr27AL7Mo2 material.
2.6 electrical control system, 1 set
Temperature control: the furnace for heat treatment for metal adopt 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.
