380V 3P 50HZ Bogie Hearth Furnace With Siemens S7-200 PLC Control

380V 3P 50HZ Bogie Hearth Furnace With Siemens S7-200 PLC Control

1. Application

The gas and electrical combined bogie hearth furnace is mainly used for heat treatment of metal parts.

2. Main Technical Parameters

3. Structural Introduction

The bogie hearth furnace is mainly comprised of furnace body, lining, furnace door and door up-down system, bogie,

heating element, and temperature control system.

3.1 furnace body

The furnace body steel structure of bogie hearth furnace is made from 10-12mm 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.

3.2 lining

The lining material used is quality high 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 stainless steel parts. This refractory

lining structure has the advantages of low heat conductivity, strong anti-shock capacity, and anti-erosion. The lining layer

total thickness is 350mm.

The silicate aluminum fiber resists a maximum temperature of 1250℃. The round steel fixation parts are made of 304 material.

3.3 furnace door and door up-down system

The furnace door is comprised of all-fiber lining and steel structure shell. The furnace body is made of 10mm steel plate and

10mm sectional steel. The door is built with silicate aluminum fiber blocks same as that for the furnace body. The fiber blocks

are fixed by stainless steel parts. The overall structure of the furnace maintains its shape while heated. The door edge is made of

10mm thick steel.

Driving method of door: The bogie hearth furnace door is electrically lifted up or down by the electric hoist, and the door is sealed by the

spring compression mechanism. The use of the electric hoist removes the need of a foundation pit.

Sealing structure: The door sides are sealed together with the furnace body through the fiber blocks, and the fiber block is

compressed by the spring to ensure a firm sealing between the door and the body.

3.4 bogie

The bogie is comprised of bogie frame, wheels, refractory bricklaying body, Cr25Ni20 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.

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 3 pairs of Ø300 wheels to support the

weight of the parts.

bricklaying body: The bogie is built with a combination of high aluminum 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 Cr25Ni20 heat resistant steel casting part with 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 bogie and the furnace body is through

deformed bricks and fiber blocks.

3.5 heating element

heating element: The 0Cr27AL7Mo2 resistance spiral-shape alloy resistance strips are mounted in the 2 side walls and the bogie.

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 zones. All lead-out

conductor bars are made of φ16 0Cr27AL7Mo2 material.

3.6 temperature control system

Temperature control: the furnace adopts Shimaden intelligent temperature controller (Japan brand) to control the temperature

which has self-tuning function to calculate the ideal PID parameter and achieve a temperature stability.

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. When the furnace works, the heating loop works according to the set program

of the temperature controller.

The control actuation system of the car bottom furnace is a large-power triggering one complete with a radiator and an air cooling system.

The heating loop is equipped with ammeter, voltmeter, heating element on-off indicator, power-on interlock protection, and safe

earthing measures.

4. Supply Scope of Bogie Hearth Furnace

5. Main Components List

Picture of PLC control for Electric Resistance Bogie Hearth Furnace