For precise speed control in rolling mills the main drives of the roll stands and the coilers need to be equipped with an encoder. In addition, it is often necessary to provide increased protection for personnel during special operating modes, such as: For this application Johannes Hübner Giessen has been working with Motor OEMs for many decades to provide complete solution ie. Electrical and mechanical components.
Home Case Studies Hot and Cold Rolling Mills / Main drives:
Modernization of existing encoder installations
Hot and Cold Rolling Mills / Main drives: Modernization of existing encoder installations
Pilger mill in tube rolling mills - hot and cold pipe detection
- Easy exchange or extension of existing encoder solutions
- Cost-efficient, as encoders can be exchanged selectively
- Implementation in the shortest possible time, optionally SIL certified
- Planning, delivery and mounting support from a single source
Hübner Giessen standard encoder solution for main drives
Task
- All around the world Hübner Giessen encoder solutions are installed at main drives of Hot and Cold Rolling Mills.
- These large motors often run for many years and after a while the question about a possible encoder modernization arises to provide new or additional electrical outputs.
Solution
- With the encoder solutions implemented by us, the scope for a modernization is limited to a minimum. For example, our FGH 6 and FGH 8 encoders have an integrated mounting flange ex
works. Thereby an additional encoder can easily be added to the existing encoder system. - This could be a freely programmable overspeed switch or a universal encoder system with fiber optic signal transmission (both optionally SIL certified). But also an additional incremental
encoder with different pulse rate could be an option. - In any case you can count on our support for the complete project. From the first discussion to the installation support on site.
Exploded view
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
