1000℃ Bogie Hearth Furnace With Two Doors 3600×1000×900mm Electrical

3600×1000×900mm Electrical Bogie Hearth Furnace With Two Doors

1. Application

The RT2-230-12 electric bogie hearth furnace is mainly used for heat

treatment of steel structure parts, cast steel parts, shaft bar parts, tool steel

products, etc.

2.Structural Introduction

The RT2-380-12 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 bogie hearth furnace design 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 car bottom furnace design 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 high temperature bogie hearth 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 240mm. 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 Changzhou Huibang 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 2 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.

3.Main Technical Parameters