The invention discloses a crane, a moment limiter and a safety control system and method. The system comprises a receiving unit and a controller. The receiving unit is used for receiving the pressure difference between pressure oil at an inlet of a hydraulic motor for lifting a winch and the pressure oil at an outlet of the hydraulic motor of a lifting winch and the distance between a fixed pulley set and a movable pulley set of a jib lubbing mechanism. The controller is used for calculating the sling load of the crane according to the pressure difference between the pressure oil at the inlet of the hydraulic motor and the pressure oil at the outlet of the hydraulic motor, calculating the working range of the crane according to the distance between the fixed pulley set and the movable pulley set of the jib lubbing mechanism and comparing the sling load, obtained through calculation, of the crane and the working range, obtained through calculation, of the crane with a preset lifting performance table, so that it is ensured the crane is made to conduct hoisting only in the safety direction through restraint under the condition that hoisting of the crane is not safe. According to the crane, the moment limiter and the safety control system and method, the sling load of the crane is calculated according to the pressure difference between the pressure oil at the inlet of the hydraulic motor and the pressure oil at the outlet of the hydraulic motor, the working range of the crane is calculated according to the distance between the fixed pulley set and the movable pulley set of the jib lubbing mechanism, no coupling relationship exits between calculation of the sling load and calculation of the range, and thus the sling load and the range are independent of each other, and calculation is convenient.
Crane safety control system and method, moment limiter and crane
2015-11-18
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
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