Well-type Resistance Furnace
Pit-type resistance furnace is a vertical periodic electric furnace. We built this one specifically for long, heavy shafts – think power station rotors, rolling mill rolls. Stuff that sags if you heat it lying down.
The chamber goes into the ground. You load the part vertically. That solves the bending problem right from the start. If you've ever tried to heat treat a 7 meter rotor in a horizontal furnace, you know what I mean. It comes out like a banana. The pit furnace keeps it straight.
Danyang Dingfeng Industrial Furnace Co., Ltd. is one of the most reliable manufacturers and suppliers of well-type resistance furnace in China. If you're going to wholesale durable well-type resistance furnace made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Product Definition
Pit-type resistance furnace is a vertical periodic electric furnace. We built this one specifically for long, heavy shafts – think power station rotors, rolling mill rolls. Stuff that sags if you heat it lying down.
The chamber goes into the ground. You load the part vertically. That solves the bending problem right from the start. If you've ever tried to heat treat a 7 meter rotor in a horizontal furnace, you know what I mean. It comes out like a banana. The pit furnace keeps it straight.
Working Principle
Electric heat. Resistance elements run up and down the sidewalls. They glow, they radiate, and with some convection from circulation fans, the heat spreads evenly around the workpiece.
You hang the part vertically inside the pit. Close the lid. Run your cycle. The intelligent control system manages the ramp up, the soak, and the cool down. Rated temperature is 750°C – that's plenty for annealing, normalizing, and tempering on rotor steels.
The vertical orientation is the key. No sagging. No bending. The part comes out straight. Dimensional accuracy stays where it should be.
Features
- Vertical structure prevents bending. This is the whole reason to buy a pit furnace for long shafts. A 7 meter rotor in a horizontal furnace will drop maybe 10 to 15 mm in the middle from its own weight. That's scrap. In a pit-type resistance furnace, it hangs straight.
- Even temperature. We spec within plus or minus 5°C across the whole length and cross section. On a 7 meter deep pit, that's not easy. But with good element placement and a strong circulation fan, we get it done.
- Big capacity. Chamber size is 4 meters in diameter by 7 meters deep. Load capacity is 80 tons. That'll take the largest power station rotors and rolling rolls.
- Intelligent control. Multi-stage PID. You can store multiple process curves. Annealing for one material, tempering for another. The operator just calls up the right recipe.
- Reliable structure. Heavy steel shell. Good refractory lining. This thing runs for weeks at a time. No downtime.
- Safety. Lid interlock, over-temperature alarm, leakage protection. Standard but important.
Technical Parameters
|
Rated temperature |
750°C |
|
Working size |
4 meter diameter by 7 meter deep |
|
Temperature uniformity |
plus or minus 5°C |
|
Loading capacity |
80 tons |
|
Heat source |
electric resistance |
|
Processes |
annealing, normalizing, quenching and tempering |
|
Control |
multi-stage PID |
Applications
Heavy machinery and power equipment
Large power station rotors, steam turbine rotors, generator rotors, rolling rolls. Any long, heavy shaft that needs precise heat treatment.
Metallurgical industry
Large rolling rolls and roll shafts. A rolling mill I know processes 10 ton work rolls in their pit-type resistance furnace. Straight as an arrow every time.
Petrochemical industry
Large pump shafts, drill pipes. Long components that see high stress in service. Heat treatment has to be perfect.
Rail transportation
Locomotive axles and large shaft components. A rail shop runs 3 meter axles through theirs. Not as long as a rotor, but still benefits from vertical loading.
Customization
Dingfeng Industrial Furnace. We build to your needs.
- Size and capacity. We've built pits from 2 meters deep up to 10 meters. Diameter from 1 meter to 5 meters. Load capacity from 10 tons to 150 tons.
- Process. Annealing, normalizing, quenching and tempering, carburizing – we can adjust the temperature range and heating zone layout to match your process.
- Structural. Furnace cover drive – electric or hydraulic. Lifting structures. Exhaust systems.
Equipment Structure
- Pit body. Vertical cylindrical steel shell. Multi-layer refractory insulation inside. Holds the heat in. The shell doesn't get crazy hot on the outside – maybe 60 to 70°C.
- Furnace cover. Lift type. Heavy. Electric or hydraulic drive. Seals tight. Safety interlocks so you can't open it while the elements are live.
- Heating system. Resistance elements arranged up and down the sidewalls. Evenly spaced. Temperature sensors at multiple heights.
- Control system. PLC based. High precision sensors. Stores your process curves. The operator hits start and walks away.
- Lifting and auxiliary. Workpiece lifting structures, maintenance platforms, exhaust pipes. Everything you need to run a big pit furnace safely.
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