Roll Force load cells
The Millmate Roll Force load cells act as integral parts of the mill stand. The rock solid Pressductor® load cell design in combination with the intelligent, reliable communication functions are crucial keys to true roll force measurement.
Overview
Due to its low impedance and high output signal power the Millmate Roll Force load cells has an extremely low sensitivity to insulation defects and maintains its measuring accuracy down to a 10kΩ insulation level.
The load cell output signal is calibrated for full interchangeability between load cells of the same type and size. The various types and the wide load range cover practically all conceivable roll force measurement applications.
Load cell data
Circular load cells PFVL141C
<p><b>Nominal load (MN):</b><br> 1.6, 2.5, 3.1, 4.0, 5.0, 6.3, 8.0, 10, 12.5, 14, 16, 18, 20, 22, 25, 28, 31, 35, 40, 45, 50, 51.5, 60</p>Rectangular load cells PFVL141V
<p><b>Nominal load (MN):</b><br> 0.63, 0.80, 1.0, 1.25, 1.6, 2.0, 2.5, 3.1, 4.0, 5.0, 6.3, 8.0, 10, 12.5, 14, 16, 18, 20, 22, 25, 28, 31, 35, 40, 45, 50, 56 </p>Annular load cells PFVL141R
<p><b>Nominal load (MN):</b><br> 2.0, 2.5, 3.1, 4.0, 5.0, 6.3, 8.0, 10, 11.2, 12.5, 14, 16, 18, 20, 22.4, 25, 28</p>Annular load cells QGPR 104/102
<p><b>Nominal load (MN):</b><br> 0.10, 0.16, 0.25, 0.40, 0.63, 1.0, 1.25, 1.6, 2.0, 2.5</p>| PFVL141x | QGPR104/102 | |
| Accuracy class (% of Fnom) | ± 0.5 | ± 1.0 |
| Linearity deviation (% of Fnom) | ≤± 0.5 | ≤± 1.0 |
| Hysteresis (% of Fnom) | ≤ 0.2 | ≤ 0.2 |
| Repeatability error (% of Fnom) | ≤ ± 0.1 | ≤ ± 0.05 |
| Compression (mm at Fnom) | 0.05 | 0.05 |
| Calibration error (% of Fnom) | 0.1 | 0.1 |
| Compensation for min. error | +20 - +80°C | +20 - +80°C |
| - Zero point drift | ≤ ± 0.01%/°C | ≤ ± 0.005%/°C |
| - Sensitivity drift | ≤ ± 0.01%/°C | ≤ ± 0.01%/°C |
| Working temperature range | -10 - +90°C | -10 - +80°C |
| Max. permitted short-term temp. | +110°C | +110°C |
| Storage temperature range | -40 - +90°C | -40 - +90°C |
Application
<p>ABB has many years of experience of installing load cells in all types of rolling mills. To achieve the best possible measurement results, certain basic rules must be observed during the installation of the load cell:</p> <ul> <li>The entire force must pass through the load cell.</li> <li>The force must be measured as close to the source of the force (the roll gap) as possible.</li> <li>The load cells must be protected to the greatest possible extent from large bending, lateral and torsional forces.</li> </ul>
Under the mill screw
<p>For installation under the mill screw, the load cell can be combined with thrust bearings and pressure plates into a package attached to the mill screw.</p> <p>This arrangement results in good force distribution, simple, inexpensive installation and easy servicing. In addition, there is no need to machine any surfaces on the roll stand. However, this arrangement does take up space in the roll window .</p>Under the lower back-up roll bearing
<p>There must be a sufficiently large flat surface on the lower part of the roll stand to allow the installation of the load cell under the lower back-up roll bearing.</p> <p>This arrangement has the advantage that there is no need to pay particular attention to the load cell during roll change. See also our offer regarding Load Cell Packages to the right .</p>Annular load cell between the mill nut and the mill stand
<p>This version makes measurement possible even if the space under the mill screw and under the lower back-up roll bearing is insufficient.</p> <p>This arrangement also has the advantage that there is no need to pay particular attention to the load cell during roll changing, and it is well protected .</p>Pressductor® Technology
The first Pressductor transducer was developed in Västerås, Sweden, in the early 1950's and patented in 1954.
ABB's well-known Pressductor® Technology is a measurement principle based on the magnetoelastic effect - the magnetic properties of a material are influenced by the mechanical force applied to it.
When exposed to mechanical force, ABB's Pressductor transducer produces measurement signals as a result of changes in magnetic fields. Because these signals are not contingent upon physical movement or deformation, the load cells combine sensitivity with extraordinary tolerance to overloads and virtually no built-in limit to the number of load cycles.
The ABB Pressductor transducers produces high-power, low-impedance AC signals that are very resistant to electrical interference and earth faults.
ABB's Pressductor transducer stands for unbeatable load cell performance, thanks to its unique combination of accuracy, overload capacity and ability to withstand harsh environments. By using this technology you will achieve higher quality and reliability, especially under demanding conditions.