System information

Function

The load cell comprises a stable outer ring with flange cover and centering collar for precision assembly. The inner ring in the form of a double bending beam ensures centered mounting of the ball bearing. The radial forces created by the web unbalance the strain gauges linked together to form a measuring bridge on the inner ring. This leads to an analog output signal proportional to the web tension.

Area of use

Flange load cells are used in practically all production plants where web-type materials are processed or finished. In front of processing stations, in particular, it is of fundamental importance that the web is transported with a continuous web tension.

Application

With a 90° horizontal-vertical wrapping angle on the measuring roller and a horizontal measuring direction, optimal acquisition of the web tension is assured. Only the double-sided acquisition of the resulting force on the left and right FR/K prevents incorrect measurements caused by lateral web movement and asymmetrical web tension distribution. Load cells incorporated into a closed control loop are to be mounted as near as possible to the actuator.

Calibration

The tensile force-path characteristic curve forms a straight line to the mechanical stop. All the load cells with the exception of the PD 25 series are calibrated to the nominal measuring force. Between the nominal measuring force and mechanical stop, a safety factor of 50 to 100 percent is taken into account to compensate for asymmetrical web tension distribution.

Legend

F = Web tension (N) | F1 = Force component 1 in measuring direction (N) | F2 = Force component 2 in measuring direction (N) | FG = Weight force (N) | FR = Resulting force in measuring direction (N) | FR/K = Resulting force/load cell (N) | α = Angle between departing web and measuring direction | β = Angle between incoming web and measuring direction

Calculation, flange load cells

Calculation, sensor rollers

F1 = F x cos α

F2 = F x cos β

FR/K = (F1 + F2)/2

F1 = F x cos α

F2 = F x cos β

FR = (F1 + F2)

Legend

1 = Transport drive | 2 = Process | 3 = Main drive

Characteristic curve

Legend

Y = S (mm) | X = F (N) | A = S Stop | B = S Nominal | C = F Nominal |  D = F Stop | E = s = f (F)

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Tension measurement systems

Flange load cell, steel PD 21/22

High flexibility thanks to different shaft diameters ranging from 12 to 65 mm and nominal measuring forces ranging from 0.05 to 10 kN

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Stainless steel flange load cell PD 23/24

Flange load cell made of stainless steel for difficult ambient conditions

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Flange load cell, aluminum PD 25/26

Cost-effective flange load cell made of aluminum with an anodized surface

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Flange load cell for for rollers with bearings on one end PD 27

Flange load cell with a nominal measuring force of 60 N for mounting on rollers with bearings on one end

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System components

Measuring rollers BA 6

Aluminum roller with outer bearings for mounting of flange load cells and for transmission of the web tension on moving webs in industrial systems

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Analog measuring amplifier CV 22

Single-channel measuring amplifier for connecting two fabric tension sensors to a strain gauge bridge

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Digital measuring amplifier with display PA 62

Digital two-channel measuring amplifier for connection of 2 fabric tension sensors with a strain gauge bridge

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Web tension controller DC 62

Compact, digital web tension controller for different control structures including color touch-display

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