A compact inductive proximity sensor is used for the measurement of mandrel hydraulic expansion at the down coiler. The sensor provided reliable position signal irrespective of the environmental conditions. Benefits included repeat accuracy , optimal linearity and no interference from contaminants.
Measurement of Mandrel hydraulic expansion in Down Coiler
Pilger mill in tube rolling mills - hot and cold pipe detection
Analog Proximity (4-20mA)
- Reliable in harsh environment with heat radiation, water, grease, chemical
- High repeat accuracy, optimal linearity
- Easy parameterization for analysis; unaffected by contamination
- Robust with sturdy stainless steel casing
Challenges
- The sensor needed to operate in a very harsh environment with water, heat radiation, grease, etc.
- The requirement was to provide reliable position signal irrespective of the environmental conditions
- Existing solution had a poor performance to price ratio and with long lead delivery time
Solution
- A compact inductive proximity sensor in stainless steel casing was installed for this application.
- With a sensing range of 0-120 mm the object distance is transferred via the analogous output – 0-10Vdc giving a 4-20mA output signal. With a protection rating of IP65 it is highly robust with sturdy stainless-steel casing and entirely casted μ-processor-electronics enabling efficient operations under rough ambient conditions and temperature range of -20 to 700C.
- It is provided with a 2x2m POKT Therm cable connection
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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