Refractory fiber type electric resistance car bottom heat treatment
furnace for boronizing process
1. Working condition of the furnace
1.1 The altitude shall not exceed 1000 meters.
1.2 The ambient temperature is in the range of 5-40 ℃.
1.3 The monthly average relative humidity in the use area shall not
be greater than 90%.
1.4 There is no conductive dust, explosive gas and corrosive gas
that can seriously damage metal and insulation around.
1.5 There is no obvious vibration and turbulence.
2. Furnace lining
The furnace lining is a full fiber structure, constructed with
high-quality standard refractory 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 330mm. The silicate aluminum
fiber resists a maximum temperature of 1200℃. The fiber fasteners
are made of stainless steel.
3. Heating element
heating element: The 0Cr21AL6Nb resistance spiral-shape alloy resistance strips are mounted in 2 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 5 heating zone. All
lead-out conductor bars are made of φ16 0Cr21AL6Nb material.
4. electrical control system
Temperature control: the furnace adopts Shimaden 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 5 temperature control zones for controlling the
linkage between the temperature and the motor movements. Each zone
is set with an over-temperature alarm.
A. According to the process requirements, the temperature rise
program is set in the intelligent instrument and distributed to
each temperature zone for control. Call and edit the corresponding
process, send signals to the lower level, and collect the
temperature of each zone from the upper instrument.
B. When the main power supply is turned on for operation, the
equipment will normally control the electric furnace according to
the program process set in the intelligent instrument.
(2) Power control: it adopts high-power trigger system, equipped
with radiator and a full set of air cooling system. Each group of
electric heating elements shall be equipped with ammeter, voltmeter
and on-off indication of electric heating elements, with power on
interlocking protection and safe grounding measures to ensure safe
use. The lifting of the furnace door and movement of bogie are all
completed in the control cabinet. There is reliable electrical
interlocking between each action and power on interlocking
protection with the electric heating system.
5. Components origin
| No. | Item | Origin |
| 1 | Temperature controller | Shimaden, Japan |
| 2 | SCR | Danxiang, Jiangsu |
| 3 | Resistance strip | SHOUGANG, Beijing |
| 4 | Heat preservation material | Luyang, Shandong |
| 5 | Refractory material | Yifan, Jiangsu |
| 6 | Reducer | Huibang, Changzhou, China |
| 7 | Electrical components | DELIXI |
| 8 | Hearth plate | Jianda, Xinghua, China |
| 9 | Touch screen | MCGS |
