Fundamentally improve the operating reliability and positioning accuracy of the ladle crane hoist used in steel production. Installation of the modular universal encoder system U-ONE, which offers the following special characteristics • Basic unit mounted directly at the hoist drum by using a double joint coupling on a tailor-made base plate construction • Signal transmission via fiber optic cable prevents EMC problems
Home Case Studies Hoist /Drum: Improved operating reliability and positioning accuracy at the ladle crane
Hoist / Drum: U-ONE ensures higher positioning accuracy and less maintenance time and costs for the RTG
Pilger mill in tube rolling mills - hot and cold pipe detection
- Universal encoder system U-ONE replaces inaccurate mechanical cam limit switches
- EMC safe signal transmission via fiber optic cable
- Time-saving preset function to make adjustments after replacing the wire rope
- Easy to extend with additional speed measurement and monitoring functionality
Mechanical cam limit switch for position monitoring at the hoist of a RTG crane.
Task
- PSA EXOLGAN TERMINAL BUENOS AIRES
Mechanical cam limit switches were installed on the drum side
of the SISU RTG. Resetting these mechanical cam limit switches,
for example after replacing the rope, was extremely time-consuming.
Moreover, the switching points no longer fulfilled the
accuracy requirements demanded in today’s world. Then there
was the customer’s wish to install overspeed protection on the
drum side as well as the option to acquire speed data.
The universal encoder system U-ONE reduces maintenance times
together with an increase of position accuracy.
Solution
- The U-ONE® universal encoder system fulfils all of the customer’s
requirements. It is possible to carry out minor mechanical modifications
on-site to ensure installing the basic unit presents no
difficulty. Evaluation electronics in the switchboard provide the
desired switching points, overspeed protection as well as speed
data. And, thanks to the software included in the scope of supply,
switching points and operating ranges are user programmable.
Signals between the basic unit and the electronics are transmitted
EMC safe via fiber optic cable.
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
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