Focus on serving Metal, Mining and Crane Segment.
Focus on serving Metal, Mining and Crane Segment.
High ambient temperature IR Light Barrier / Photocell) is used for the detection of thin slabs inside the tunnel reheating furnace. The system with fiber optic cables (290⁰C ambient) and separate electronics is installed 2m away from the heat zone. This allowed the photocell to operate in ambient temperatures of 290⁰C without the need of any water cooling.
Slab Centering at Charging side
Pilger mill in tube rolling mills - hot and cold pipe detection
Accurate performance in high ambient temperature up to 290 ⁰C
- High operating reserves
- 290°C ambient temperature without any water-cooling
- Unaffected by water vapor, smoke, dust
- Safe from leaking flames
Challenges
- Furnace refractory deteriorates and creates hot spots causing signal fluctuation.
- Burner flames directly cause disturbances, leading to false triggering.
- Flames can get out of the furnace through sitting tube and damage the lens of the sensor.
- Breakdown due to slab pile up inside the furnace caused by false triggering of the photocell.
Solution
- Light Barrier with high operating reserves enables keeping the photocell 30-40cm away from glass window saving it from any leaking flames.
- Photocell can operate in ambient temperature of 290⁰C without any water cooling. Electronics can be kept safely 2m|5m|10m away.
- The powerful infrared transmitter diodes create a large beam diameter that penetrate through water vapour, smoke and dust.
Products and Accessories
Case Study Number
- TP3
Challenge
- The increasing flexibility of production lines requires a high adaptability of sensors. Continually changing object geometries, different temperatures and very high radiation or surrounding temperatures are no rarity.
- In a pilger mill those rough conditions can be found, among others in the production of seemless steel pipes. The raw steel blocks, each weighing a few tons are heated up first in a round oven at a temperature of 1300 °C.
- After descaling of the surface, the steel block is prepunched in a hole press with a strength from a converted 2000 t. In the next sloping rolling mill the growing pipe rotates between two rollers that are positioned at an angle to each other. The punching is widened to the size of the mandrel diameter.
Previous solution / Competitor product
- N/A
Solution
- The sensor that was installed at this application is the HMD OKA 2038.38 G with tube OL 19.
- The signal of the infrared sensors controls the movement of centering device and abutment. The point of view is restricted by the tube and prevents disturbances by steam in the cooling phase.
- An optimum adaptation to the operating conditions is given due to the adjustable response temperature. The HMD with self-learning response temperature (Auto-Teach function) is suited to continually changing conditions.
- The compact sensor with a stainless steel housing can withstand surrounding temperatures of up to 75° C. The use of a cooling jacket raises this up to 200° C.
- Alternatively sensors with fibre optic cables are available which permit an application at ambient temperatures up to 600° C without cooling.
Customer Benefits
- Maintenance-free
- High temperature stability
- Recognition of hot objects at big distances
- Self adjustment with Auto-Teach or step switch for the response temperature
Product Part number
- OKA 2038.38 G
Brand
- Proxitron
Accessories
- Piros swivel stand HM2
- Tube OL 19
- Pilot light unit (for alignment) DAK 308 + OL 26
- Different cable lengths (e.g. 15 m)
Customer Testimonial
compared to previous solution or competition
Case Studies
Other Solutions in Hot Rolling Mills -Reheating Furnance
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Sample case study title lorem ipsum here
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Sample case study title lorem ipsum here
Short description of the problem solved, maybe include the client name.
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