Protection field switching with DME5000 laser distance measurement system

Protection field switching of rail-guided transport trolley for rolls of paper independent of position and direction using laser distance measurement system.

For a rail-mounted truck that travels in two directions, a precise and robust system was sought for switching between and activating the protective fields of two safety laser scanners mounted on the truck.

Two DME5000 laser distance measurement systems mounted on the truck are used. When the truck is moving, the two sensors continuously measure (redundantly in the related direction) the time taken by the light pulses emitted to travel to the end of the track and back. From this information the electronics determine the position of the truck and provide this information to the truck’s PLC over Profibus. The data are processed in the PLC and the related binary signals generated. These signals are used for protective field switching on the laser scanners.

The proximity switches originally used for the protective field switching did not last long, as the switching lugs for the proximity switches were bonded to the floor and were frequently damaged by the fork lift trucks in the building. The DME5000 PLS solution has proven to be extremely reliable in comparison. Furthermore, the measurement accuracy is extraordinarily high at /- 2 mm with a reproducibility of 0.5 mm. A current measured value is output every millisecond – it is hardly possible to measure distances more precisely in such applications.

This is an application from SICK.
Tri-Phase Automation is a SICK distributor in Wisconsin.
Contact Tri-Phase Sales or Get A Quote

Measurement of Sewer Chambers

A measurement system based on SICK laser scanner for measuring sewer chambers.

Challenge
During the measurement of sewer chambers, it is normally necessary to actually enter the sewers. A step descent through the vertical shaft, moisture, dirt and unforeseeable circumstances make this activity an unpleasant and to some extent dangerous experience for the authorities and surveyors. For this reason, an unmanned, portable, opto-electronic solution for recording 3D data was sought.

Application Solution
The result is a chamber measurement system based on SICK’s LMS500. Mounted on the chamber measurement system’s turntable, the LMS500 is lowered upside down using a telescopic support. Once at the bottom, the LMS500 is rotated by 360° for the measurement. During the measurement, the measured data from the LMS500 as well as the actual position on the turntable are recorded. In practice the distances measured are between 1 m and 30 m. The result of a three-minute all-round scan using the LMS500 is a set of data comprising more than a million individual measured points. The vertical resolution is limited to 0.25°, the horizontal resolution is, on the other hand, variable. The 3D model of the sewer chamber is then generated using the chamber measurement system’s evaluation software.

Benefit
By using the chamber measurement system and the LMS500 it is no longer necessary to enter chambers to make the measurements. Darkness, dark walls or moist concrete surfaces do not impair the function of the LMS500 in the 3D chamber measurement system. Due to the fine resolution of the measured data – even the smallest duct or the rungs on the ladder are clearly visible within the set of data – a very exact 3D image of the chambers can be generated.

This is an application from SICK.
Tri-Phase Automation is a SICK distributor in Wisconsin.
Contact Tri-Phase Sales or Get A Quote