3000×1000×1000mm Electrical Car Bottom Furnace

1. Application

The RT₂-220-9 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 RT₂-220-9 bogie hearth furnace is mainly comprised of furnace body,

lining, furnace door and door lifting system, furnace door pressing and sealing

mechanism, bogie, heating element, and temperature control system.

2.1 furnace body

The car bottom furnace manufacturer body steel structure is made from 8-10#

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. Due to the furnace

works at a high working temperature, the surface plate of the furnace body is made

of 14mm thick plate which is welded piece by piece.

2.2 lining

The car bottom furnace price body is built with an all-fiber system. The lining material

used is high quality zirconium refractory fibre 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 1350℃. The material of round steel fixation parts is 321 stainless steel.

2.3 furnace door and door up-down system

The wholesale bogie hearth furnace door is comprised of all-fiber lining and steel structure

casing. The door frame is made of 14mm thick steel plate . 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 with electric push rod.

Furnace door structure: The main material of the door is made of 14mm steel plate and

10# steel welding, which can not only ensure the overall rigidity and strength of the door,

but also make the door light and reduce the weight of the door.

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 20mm thick heat resistant

cast 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.

Silicon carbide bogie face plate: total thickness 35mm, max working temperature≤1300℃.

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 electric push rod. The sealing between the bogie and the

furnace body is through special shape bricks and fiber cotton block.

2.5 heating element

heating element: The high quality high resistance alloy HYE stripes 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 2 heating zone. All lead-out conductor bars are made

of φ16 0Cr25AL5 material.

2.6 electrical control system

Temperature control: the furnace adopts Shimaden 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