| 摘要 |
Disclosed is a hydromechanical driving device for generating forward-pushing movements of a band-shaped filter material according to the pressure which prevails in the fluid that is to be filtered in order to operate band filter devices. Said hydromechanical driving device comprises: a hydraulic accumulator ( 29 ) that is provided with a movable element ( 31 ) which separates a first storage space ( 33 ) from a second storage space ( 35 ). The side of said separating element ( 31 ), which borders the first storage space ( 33 ) is impinged upon by the pressure generated therein by the fluid that is to be filtered; a mechanical device ( 17 ) which translates a movement of the separating element ( 31 ) into a forward pushing movement; and a pressure control unit ( 47, 49, 51 ) for generating lower pressure in the second storage space ( 35 ) than the pressure generated by the fluid that is to be filtered according to the amount of pressure and/or the degree of impurity of the fluid that is to be filtered, said lower pressure causing the separating element to be displaced.
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