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
Hoist / Drum: Improved operating reliability and positioning accuracy at the ladle crane
Pilger mill in tube rolling mills - hot and cold pipe detection
- Reliable braking when overspeed is detected
- Precise switching of hoist positions
- Configure parameters quickly and easily
- Preset shortens downtimes after rope change
Before: Hoist drum with mechanical rotary cam limit switch, but without overspeed detection. Bottom right, the new holding brake.
Task
Fundamentally improve the operating reliability and positioning
accuracy of the ladle crane hoist used in steel production by
implementing the following measures:
• Replacement of the existing mechanical cam limitswitch with an electronic position switch that ensures significantly higher accuracy
• Additional implementation of an electronic overspeed switch to realize overspeed detection as well as an emergency break
After: Hoist drum with U-ONE basic unit and holding brake. The photo right shows the U-ONE electronic modules in the switchboard
Solution
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
• The following electronic modules were installed, well-protected in the switchboard:
• FOC decoder
• Electronic position switch (ERC) with 6 relay outputs and preset input to facilitate plant adjustments
• Electronic overspeed switch (EGS) with 2 relay outputs and
integrated system check function
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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