Gas Fired Aluminum Alloy Holding Furnace For Gravity Casting

1. General Introduction

The gas fired pool type holding furnace is an aluminum alloy liquid

holding furnace which could recycle the heat of the fume and saves

energy consumption greatly.

The furnace adopts the high quality burner with a large flame radiation size

and a high heat efficiency. The aluminum liquid temperature is kept at an

accuracy of ±5℃. The furnace inside oxygen content is less than 5% which

effective prevents generation of oxides.

The holding furnace for die casting is designed with the special heat insulation

structure which could effectively reduce surface heat loss, reduce

environment temperature rise, and improve heat efficiency.

The pool type aluminum furnace wall is lined with high alumina refractory

bricks which have a service life of more than 3 years.

2. Technical Parameters

3. Furnace Structure

3.1 Furnace shell

The furnace shell is made of steel plate and sectional steel. The door edge is made

of cast iron material.

3.2 Furnace lining

The melting pool is built with high alumina bricks which have the features of high

strength, free aluminum-sticking, and long life. (compression strength: 140Mpa

when temperature is above 110℃; linear rate: only 0.1%). The heat insulation

layer used is of Grade One silicate aluminum fiber board.

3.3 Burning system:

The burning system is easy in operation, and has a long service life. The furnace

has the functions of automatic temperature control, automatic ignition, and flame

detection. When the furnace reaches the set temperature, the burner stops working.

When the furnace temperature is lower than the set lower temperature limit, the

burner enters the burner port and works automatically. The burner ignites

automatically with a flame detection device. When the furnace is ready to work,

the user should first turn on the air blower to purge the hearth. The burner ignites

automatically after purging finished and works with a small flame. The flame

detection rod detects the flame, and the burner will work with a big flame. The

flame detection rod monitors the burning status of the burner all the time.

The furnace burning system is also set with safety measures. If there are

situations such as incomplete burning or flame-out, the control system cuts

off main burner and ignition burner to stop the fuel supply. There is also the

interlock device between the gas pipeline and air pipeline. If there is any

abnormal burning situation, the interlock device cuts off the fuel supply. The

liquid aluminum temperature is controlled through PID regulation. The fan

inverter automatically adjusts the fan rotation speed so as to regulate the gas flow.

The furnace has set the atmosphere temperature upper limit value.

3.4 discharging hole

The aluminum liquid is discharged with the help of manual operation.

During the liquid discharging process, there should be no leak problem.

3.5 Temperature control

The furnace is set with control functions such as the automatic flame switches,

the over temperature alarm, the flame-out protection, etc.

Aluminum liquid temperature control

Hearth temperature control

Safety device and automatic control system

When the furnace starts to work, the user should first switch on the power supply

and turn on the blower to purge the furnace. Set the furnace temperature and

open the solenoid valve of the gas pipeline. The burner ignites when the natural

gas enters the hearth.