Adaptive load-clamping system

B - Operations – Transporting – 66 – F

Patent

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B66F 9/18 (2006.01) B66F 9/22 (2006.01)

Patent

CA 2651873

A fluid power load-clamping system has a clamp actuated by fluid pressure regulated by at least one fluid valve. The valve may increase a maximum fluid pressure automatically in response to a weight of a load. A controller causes the valve to permit a relatively high maximum fluid pressure as the clamp closes toward the load to enable high initial clamp closure speed. Thereafter the valve automatically reduces the maximum pressure as clamping surfaces close into a pre-determined relationship with the load, and then increases the maximum pressure to regulate the gripping force. Gripping pressure may be regulated continuously while the load is supported by the clamp. A weight measurement system may compensate for a position of the lifting mechanism.

Un système de verrouillage de charge hydraulique est doté d'une pince actionnée par pression hydraulique et régulée par au moins un robinet. Le robinet peut faire augmenter une pression hydraulique maximale en réponse au poids d'une charge. Un régulateur fait que le robinet permet une pression hydraulique maximale relativement élevée lorsque la pince se ferme sur la charge afin de permettre une vitesse initiale de fermeture élevée de la pince. Ensuite, le robinet réduit automatiquement la pression maximale lorsque les surfaces de serrage se ferment d'une façon prédéterminée sur la charge, puis augmente la pression maximale afin de réguler la force de préhension. La pression de préhension peut être régulée continuellement lorsque la charge est supportée par la pince. Un système de mesure du poids peut compenser la position du mécanisme de levage.

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