The invention relates to a lifting drive power control system for a large-tonnage electric forklift portal. The system comprises a first pump motor controller, a second pump motor controller, a first micro switch and a second micro switch. The output end of the first micro switch is connected with the first pump motor controller and the second pump motor controller respectively. The first output end of the second micro switch is connected with the first pump motor controller through a first delay relay and a first control relay. The second output end of the second micro switch is connected with the second pump motor controller through a second delay relay and a second control relay. The first pump motor controller and the second pump motor controller are connected with a multi-way valve through a first pump motor and second pump motor and a first oil pump and a second oil pump respectively. The multi-way valve is connected with a lifting oil cylinder. By means of the system, the pump motor is controlled through the two pump motors, and drive power gradual increasing stage lifting actions are achieved through the micro switch and the delay circuit integrated circuit design, accordingly, the portal lifting speed is improved stably from low to high.
Lifting drive power control system for large-tonnage electric forklift portal
2015-08-05
Patent
Elektronische Ressource
Englisch
IPC: | B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last |
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