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
| Melting pool capacity | 8000Kg (liquid density: 2.4g/cm3)
|
| Fuel type | natural gas heat value: 8600Kcal/m3; |
| Gas supply pressure | 5Kpa; |
| Rated working temperature | 850℃ (atmosphere) |
| Temperature control accuracy | ±3℃ |
| Energy consumption | 8m3/h (equipped with a gas flow meter, working continuously);
|
| Power supply | 415V, 60HZ, 3P 5 wire |
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.
