2. Structural Introduction
The bogie hearth furnace is mainly comprised of furnace body, lining,
furnace door and door compression system, bogie, heating element,
circulation device and temperature control system.
2.1 furnace body
The bogie hearth furnace body steel structure is made from 10-14#
sectional steel and ≥4mm 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 wholesale 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 240mm. The silicate aluminum fiber resists a maximum temperature of 1000℃.
2.3 furnace door and door up-down system
The car bottom furnace price 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 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 6
pairs of wheels, and each wheel is of diameter 300mm. One pair of driving
wheels and five pairs of driven wheels.
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.
Sealing method of furnace door: The fiber sealing block is equipped between
furnace door and furnace lining. When furnace door closing, the roller on the
both sides of the furnace door will go down along the track. And there is a ramp
at the bottom to make sure the furnace door is closed tightly. The angle of the
ramp is adjustable by the screw. (please see 3 pictures below)
2.5 heating element
heating element: The 0Cr27AL7Mo2 resistance spiral-shape alloy resistance
strips are mounted in 5 side walls, two 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 6 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 car bottom furnace design has 6 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.
