Hand-operated driving device for crane

Abstract

The invention discloses a hand-operated driving device for a crane. The driving device comprises a lifting mechanism high-speed shaft and a reduction gear and is characterized by comprising an electromagnetic clutch which is closed in case of power failure, wherein a half of the electromagnetic clutch is connected with the lifting mechanism high-speed shaft, and the other half of the electromagnetic clutch is connected with the reduction gear; the other end of the reduction gear is connected with a driving shaft; the driving shaft is in key joint with an internal pressure plate; the internal pressure plate is in left-hand trapezoidal thread connection with an external pressure plate; inter-axis positioning of the internal pressure plate and the driving shaft are realized through nuts and a washer A; a crank is fixed on the external pressure plate through a bolt and a washer B; and a balancing weight is welded on the crank. Bidirectional self-locking of load rise and fall are ensured through thread transmission, friction transmission and reasonable fitting of a pawl, and the safety and reliability of a lifting device are enhanced by using the electromagnetic clutch which is closed in case of power failure and the balancing weight welded on the crank.

Description

technical field [0001] The device relates to a hoisting mechanism of a hoisting transport machine, in particular to a hand-operated driving device for a crane hoisting mechanism with high safety requirements when the power is cut off. Background technique [0002] For cranes working under special working conditions, when a sudden power failure occurs, the hoisting mechanism needs to lower the load safely or slowly move the load up to the designated position, so it is often equipped with a set of manual drive devices. But the manual mechanism of the existing hand drive device such as the crane hoisting mechanism disclosed in patent ZL200520128465.1 is realized by simple mechanisms such as manual clutch and crank. There is no counterweight on the crank handle, which cannot ensure the effective screwing of the thread; when the crane is electrified, if the operator forgets to open the clutch, it will drive the hand drive mechanism to reverse rotation under the action of the lift...

AI Technical Summary

Problems solved by technology

There is no counterweight on the crank handle, which cannot ensure the effective screwing of the thread; when the crane is electrified, if the operator forgets to open the clutch, the manual drive mechanism will be driven to reverse rotation under the action of the lifting load's own weight, which is prone to safety hazards. Accidents; and the most important thing is that when using the existing technology to manually lower the load, it is necessary to manually release the pawl. At this time, if the operator suddenly releases the crank due to a mistake, it will also cause a safety accident.

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