Metal

Position sensor for stirrup bending machine

Find out how to achieve control of the position of the rolls with a repeatability of 0.1 mm in the stirrup bending machine

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PC
Con rótulas autoalineantes de cuerpo cilíndrico

PC potentiometer position sensor

Mechanical movements and  horizontal and vertical pins of the automatic rebar bender require position control with a repeatability of 0.2 mm.
The potentiometric position sensor “PC” allows to control of the position of the movements of the stirrup bending machine with repeatability of linear positioning 0,1mm and the detection of the position in real time after a restart without reset.

Overview

  • Application: Position control of the movements of the stirrup bender with a repeatability of a 0.2 mm
  • Product: PC potentiometric transducer – aluminium profile
  • Results: PC enabled the position control of the rollers with a repeatability of 0.1mm.

The process

A stirrup bender automatically unwinds a steel reel and then straighten the steel rod using rotating pins.

The rod is then be bent as required using a mechanical finger that shapes it around a fixed pin. Finally, the workpiece is cut at one end and unloaded.

The final shaped product can be used for the construction of reinforced concrete structures, walls or load bearing pillars etc.

Figure 1 – Process scheme

The challenge

  • The mechanical movements as well as the horizontal and vertical pins of the stirrup bender require the position control with a repeatability of 0.2 mm.
  • In the event of a machine restart, the position transducers should immediately provide the real position with no need of reset.
  • According to size and complexity of the machine, number of stirring pins can vary from 4 to 8 per machine.
  • Considering different size and technical characteristics of the machines, the position measurement and control should be addressed with a cost-effective solution while ensuring it meets the performance parameters.

Product benefits

“PC” potentiometric position transducer

  • Repeatability of the linear positioning of 0.1mm Real time position after a restart (absolute transducer);
  • The self-aligning ball joints makes correction of possible mechanical backlashes/misalignments and this also helps in easy and quick installation
  • Reduced dimensions for the installation inside the machine – very useful for machines with space constraint.

Solution

The position control of the movements of the stirrup bender

PC absolute potentiometer transducers – 5 to 8 Nos

  • 35 mm aluminium tubular profile, 10 mm cursor drive, self-aligning ball joints
  • Repeatability: 0.1mm
  • Resolution: infinite
Figure 2 – Product: PC potentiometric position transducer