Short circuit protected proximity switch for 10 – 55 V DC with 3-wire technology was used for the accurate detection of roll change in very harsh operating conditions. The high temperature electronics can withstand ambient temperature of up to 100⁰C
Roll Change Detection: High temperature proximity for wet areas with heat radiation proximity
Pilger mill in tube rolling mills - hot and cold pipe detection
Best solution for roll change proximity under most aggressive environment
- Reduction in roll change time to maximize production/ equipment availability
- High ambient temperature electronics (1000C and 1200C)
- Cable protection system from flying scales, sparks
- PBT housing material prevent corrosion of the housing easy to replace during shutdown
Challenges
- Delays/interruptions in roll change as the feedback from proximity was not reliable
- Detection in harsh operating environment continuous water from spray headers; high ambient heat from the strips.
- Cable damage due to flying chips / scale
- PVC cable crackling from temp. cycling
Solution
- Improvised field proven proximity used by SMS-Siemag | Primetals by
- high temperature electronics
- PBT housing designed to reduce impact of temperature cycling
- Silicone cable withstand 1800C
- Reduce damage from mechanical play by higher sensing 15|20|25mm
- Integrated cable protection
- Higher IP rating
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
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