{
  "abstract": "The present invention relates to a spiral-tightening device for a modular spiral tower ( 1 ) of a vertical vibrating conveyor (S), in which vibrating conveyor a wedge slider ( 4 ) is inserted between the drive ( 3 ) and the spiral tower ( 1 ). The wedge slider comprises an anchor plate assembly ( 25 ), which is vibratable, i.e. is coupled to a drive, and a wedge assembly ( 24 ), which is at rest, i.e. is decoupled from the drive. A wedge ( 12 ) in said wedge slider ( 4 ) can be slid by means of an electronically controlled stepper motor ( 18 ) and, in the process, loads or relaxes a spring element ( 13 ), which transfers its predetermined spring force to a tension anchor ( 7 ). Said device allows stable vibratory behavior to be ensured and comprises a controller for closed-loop control of the operation of said wedge slider ( 4 ), i.e. allows the installation and assembly, operation, and removal and disassembly of the spiral tower ( 1 ) to be semiautomatically controlled. Principally, said spiral-tightening device and the method for closed-loop control of the operation thereof are suitable for use in the case of vibrating conveyors having a conveying height of over approximately 2.5 m, in particular from approximately 2.5 m to approximately 5 m.",
  "assignees": [
    "KRAEMER AG"
  ],
  "authors": [
    "FISCHER HORST",
    "FRECH TOBIAS",
    "RÜTTI MARIO"
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  "published_at": "2026-09-15T19:14:33.590895Z",
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  "source_date": "2026-02-19",
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  "title": "Semiautomatic spiral-tightening device for a vibrating conveyor",
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