Electrohydraulic lifting control device for industrial trucks
AssigneeHAWE Hydraulik SE
InventorMartin Heusser
Life of this patent
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Abstract
In an electrohydraulic lifting control device (S) for stacker trucks, which comprises, for lifting control, an electrically operable three-way flow regulator (R1) in a lifting branch (1) between a pressure source (P) and a hydraulic cylinder (Z) as well as, for lowering control, an electrically operable two-way flow regulator (R2) in a lowering branch (2) which branches off from the lifting branch (1) and leads to the reservoir, a redundancy switching element (A) is provided, which is actively electrically operable between closed and open positions, said redundancy switching element (A) being provided between the control pressure circuit of the two-way flow regulator (R2) and/or the control pressure circuit of the three-way flow regulator (R1) and the reservoir (T).
Claims14
An electrohydraulic lifting control device (S) for industrial trucks, comprising a lifting branch (1) provided between a pressure source (P) and a hydraulic cylinder (Z) and including a three-way flow regulator (R1), which is provided with a proportional magnet and a pressure balance (5) and which is adapted to be electrically operable at least for the purpose of lifting control, and further comprising a lowering branch (2) branching off from the lifting branch (1) towards the reservoir and including, for the purpose of lowering control, an electrically operable two-way flow regulator (R2) provided with a proportional magnet and a pressure balance (10), characterized in that a redundancy switching element (A), which is actively electrically operable between closed and open positions, is provided between the pilot pressure circuit of the two-way flow regulator (R2) and/or the pilot pressure circuit of the three-way flow regulator (R1) and the reservoir (T).
Dependencies are inferred from the claim text.