Bogie Hearth Heat Treatment Electrical Tempering Furnace 2000×900×600mm

2000×900×600mm Electrical Bogie Hearth Tempering Furnace

1. Application

The RT3-70-6 electrical bogie hearth furnace is mainly used for

tempering, structural steel, cast steel, spring steel and tool steel.

2. Structural Introduction

The RT3-70-6 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 bogie hearth furnace design 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 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 950℃.

2.3 furnace door and door up-down system

The wholesale car bottm 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 4 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.

Bogie face plate is cast with CrMnN, 30mm. The max temperature≤950℃. It has

long - term use without deformation and cracking.

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 a centrifugal fan 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

4. Supply Scope

5. Components Origin