Large-volume bell lift type furnaces
This type of furnace is designed for serial or large-scale production, as well as for processing large products. A design feature of this type of furnace is a monoblock assembled heating unit, mounted on the walls and cover of the hood, so that the heating unit rises with the hood. Two powerful screw hoists provide a smooth rise and lowering of each hood. Thanks to the precision execution of the mechanical assembly of the lifting mechanism, any jerking, seizing and vibration are practically eliminated.
After raising the hood, horizontal loading of the cages with products under the hood is possible, which is especially true with a large mass of parts. With this configuration, a phased installation of the cage and parts in the cage is possible, which significantly increases the number of products.
As a rule, such furnaces are made by double-bell with alternating heating caps. Heating elements can be of a cylindrical and wire type, from high-temperature alloys of resistance (nichrome, eurofechral, kanthal A1), molybdenum, less often from tungsten. It is possible to install an all-welded heater of complex design made of tungsten or molybdenum. The large volume of the chamber allows the manufacture of furnaces of this design with multi-zone heating.
| Chamber quantity, items |
2 |
| Type of chambers |
cylindrical, vertically oriented |
| Inner dimensions of chamber: diameter, mm height, mm |
250-400 300-700 |
|
Operating temperature range in the heating chamber, oC: control by thermocouples PP(S) or PR(B) control by thermocouples BP(A1) or BP(C) |
50-1250 50-1600 600-2000 |
| Heating type |
resistive |
| Permissible mass with parts, kg |
10-80 |
| Available oxygen removal methods |
purging with nitrogen or inert gas, evacuation pumping, multi-stage |
| Range of heating / cooling speeds, ° C / min |
3-25 |
| Working gases |
hydrogen, helium, nitrogen, argon, methane, formgas |
| Number of inputs for working gases |
2-6 |
| Available operations with working gases |
mixing, moisturizing |
| Minimum percentage of each gas when mixed, % |
5 |
| Range of automatic adjustment of the flow rate of each gas, l / min |
50-1200 |
| Ability to use as a vacuum or gas vacuum furnace |
yes |
| Types of pumping systems |
oil (rotary vane + diffusion pumps), oil-free (dry scroll + turbomolecular pumps) |
| The uniformity of temperature in the working space without loading the electric furnace with automatic control of maintaining the temperature in the steady state, ° C, is not worse |
±7±0,005t |
| Stability of maintaining the operating temperature in the working area when controlling heating in automatic mode, ° C, not worse |
±5±0,0015t |
| Heaters power consumption, kVA |
35-100 |
|
Total dimensions, mm, no more than: length: width high |
2600 1600 2850 |
| Weight, kg, no more than |
3750 |
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