QUICK-CHANGE SYSTEM FOR CHANGING ATTACHMENTS ON A CONSTRUCTION MACHINE: Fid-Bau Portal

QUICK-CHANGE SYSTEM FOR CHANGING ATTACHMENTS ON A CONSTRUCTION MACHINE

SCHAUER STEFAN

A quick-change system for changing attachments on a construction machine with a quick coupler is disclosed. The quick coupler is arranged to be pivotable about a pivot axis 5 orthogonal to the axis of rotation by means of a hydraulic slewing drive (12) and rotatable about an axis of rotation on a connection part by means of a hydraulic rotary drive (9). The quick coupler contains at least one locking element which can be actuated by means of a hydraulic drive (27) to hold an attachment (46) coupled to the quick coupler (1). The quick-change system is characterized by a hydraulic control device (44), which contains 10 a first control circuit (47) to drive the rotary drive (9) and the slewing drive (12), and at least one additional control circuit (61) to supply the attachment (46) coupled to the quick coupler (1). It also includes a shuttle valve arrangement (64) to expose the hydraulic drive (27) to the higher pressures acting in the first or the at least one additional control circuit (47, 61) to activate the at least one locking element (26). [Figure 3] Figure 3 P/T-------------- TL r -----__ t - ~I --------------- - - - - - -/ , ----------- 58 59-- 5 L -j47 55-1 153 12 9 45 46 27

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