Schwing and Baumer develop boom sensor

摘要

Schwing, in partnership with Baumer Electric, has developed a new strain sensor for truck-mounted concrete pumps, claiming a broad measuring range to provide precise signalling of deflections as they occur in the boom. The trend for truck-mounted concrete pumps is said to be for greater reach with less weight, and the new strain is designed to help raise operator comfort levels on truck-mounted concrete pumps with large booms. Baumer said that with modern placing booms having a reach of almost 65m and highly efficient twin cylinder piston pumps with a pressure of up to 85 bar, they pump concrete at up to 164m~3/h. It said this caused vibrations in the boom, and to be able to offer improved operator comfort at the end hose, Schwing said it had developed an innovative vibration damping concept which has included a complete revision of the hydraulic elements. A precision transducer was required which could pick up the elongations from the signal boom caused by movement of the whole placing boom, and which would then transmit the command variables for the vibration damping.