Electrical Heat Treatment Car Bottom Furnace 2500×1300×1100mm 400℃

2500×1300×1100mm Electrical Car Bottom Furnace, Bogie Hearth Furnace

1. Application

The RT3-105-6 electrical bogie hearth furnace is mainly

used for annealing, tempering, structural steel, cast steel,

spring steel, tool steel, aluminum products and motors.

2.Structural Introduction

The RT3-105-6 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 car bottom furnace body steel structure is made from 10-12#

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 high temperature 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 950℃.

2.3 furnace door and door up-down system

The Electrical Bogie Hearth Furnace door is comprised of all-fiber lining and

steel structure casing. The door frame is made of 10mm 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 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 240mm.

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: The seal between furnace door and furnace body and bogie is more

important. The seal between furnace door and furnace body adopts spring

compression structure. The seal between bogie and furnace body is seal of

special-shaped brick and fiber cotton block.

2.5 heating element

heating element: The 0Cr25AL5 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 1 heating

zone. All lead-out conductor bars are made of φ16 0Cr25AL5 material.

2.6 electrical control system

Temperature control: the furnace adopts 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 1 temperature control zone 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.

2.7 Hot air circulating system:

It is mainly comprised of two centrifugal fans and an air guide plate in the furnace.

The heat emitted by the heating element is evenly blown to the effective working

area by the circulating fan through the wind guide plate. The air guide plate is made

of 1Cr18Ni9, and the fan and shaft are made of 1Cr18Ni9Ti. In order to ensure the

normal use of bearings, the cooling method is air cooling.

Guide device: it mainly circulates the air generated by the circulating fan in the furnace

along the direction of the guide plate effectively in the furnace, so as to make the air in

the furnace produce rapid convection, so as to achieve the goal of temperature

uniformity. The materials of wind guide plate and framework are all made of 304

stainless steel plate. The air guide plate and the framework are connected in a

movable way to ensure the free expansion of the air guide plate under high temperature,

and it is convenient for repair and maintenance.

3.Main Technical Parameters