Mätning av abrasivflöde för vattenskärningsmaskiner
MaskinteknikMechanical engineering - generalAbrasivFlödeSandflödeVattenskärningFlödesmätningWaterjet
The content of the following report is the summarized result of three students
thesis at Blekinge Institute of Technology in co-operation with Water Jet
Sweden AB.
This report will give the reader a description of principles how to measure the
abrasive mass flow in a waterjet cutting system.
The work began with a visit to Water Jet Sweden AB to get a closer look at the
problem. When the analysis of the problem was done the criteria were defined in
the form of demands and desires. The main task of the criteria was to guide the
search for the solution. The work proceeded with an extensive search for
abrasive flow meters along with obtaining information about flow measurement in
general. When the search for abrasive flow meters resulted in nothing all the
efforts were concentrated on finding a principle of measurement that could cope
with the criteria. A number of commonly accepted principles for measurement of
mass flow was studied and evaluated. Those passing the evaluation were subject
to another more extensive review. In this review the only conclusion was that
none of the principles could be dismissed without practical testing. Water Jet
Sweden AB were asked which principle/principles of measurement they were most
interested in. After coming to an agreement two closely related principles of
measurement were chosen to undergo practical studies. A number of different
abrasive flows were simulated and in some cases a distinct variation of the
signal value could be observed.
Everyone involved in this project knew from the beginning that it was
extensive. Even though no prototype was presented, this work represents a good
foundation for future development.