VACUUM TUBE LIFTING DEVICE AND LIFTING HOSE AND METHOD FOR CONTROL OF A VACUUM TUBE LIFTING DEVICE

摘要

The invention relates to a vacuum tube lifting device comprising a lifting hose (15), which lifting hose (15) has a first end (15a) for attachment of the lifting hose (15) and a second end (15b) for connection to a means (17, 18) disposed to couple the lifting hose (15) to a load (25),wherein the lifting hose (15) is adapted for connection to an adjustable vacuum source ( 11) and a control unit (13) disposed to adjust the pressure inside the lifting hose (15) by means of input signals for the purpose of achieving an extending or contracting shifting movement of the lifting hose (15) for shifting of a load (25). The device comprises an arrangement (26) disposed to measure in an ongoing manner a parameter proportional to the momentary length of the lifting hose (15) or a parameter proportional to a change in the momentary length of the lifting hose (15), and to emit to the control unit (13) at least a first signal, which is used by the control unit (13) to obtain an actual value, and that said control unit (13) is disposed to automatically adjust the vacuum source ( 11) for the purpose of adjusting the length of the lifting hose (15) to a desired target value starting out from said actual value. The invention relates to a device that facilitates automatic adjustment of the pressure in the lifting hose through a possibility of automatic adjustment of at least the vacuum source. The invention also relates to a lifting hose for, and a method for control of, such a vacuum tube lifting device.