Compact IR thermal imaging camera was installed to provide a temperature map of the bottom shell. The cameral scans the full bottom of the shell giving options to define multiple areas /ROI to get 4-20mA output. Software automatically finds hot spots enable timely preventative maintenance. |
Converter / Lance position: New solution for positioning of the oxygen lance
Pilger mill in tube rolling mills - hot and cold pipe detection
- No need of complex encoder constructions
- Higher accuracy
- Easy configuration of switching points
- Precise and reliable positioning
Before: Mechanical cam limit switch and absolute encoder mounted by using an additional distribution gear.
Challenges
- The customer needed a solution to detect the lance position for precise and reliable positioning. The old solution included an absolute encoder for current position values and a mechanical cam limit switch for position range monitoring. The limited positioning accuracy due to mechanical play was caused by the necessary installation of an additional distribution gear.
- The task was to find a new solution instead of the old one with mechanical cam limit switch and absolute encoder.
After: Electronic position switches and absolute encoder in one unit directly mounted without distribution gear.
Solution
- To get the same outputs as before Hübner Giessen provides the universal encoder system U-ONE(-SAFETY)-Compact with both outputs in one unit:
• Absolute encoder
• Electronic position switches - The unit can be mounted directly to the application shaft without using any distribution gear. For this Hübner Giessen provides special double-joint couplings. The switching points are easy to configure and the system can be restarted fastly after preset.
- Optionally available with safety certification SIL 2 / PL d.
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 applications in Steel Making
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