Marine pneumatic crane hook lifting limit device

Abstract

The invention discloses a lifting limit device of a marine pneumatic hoist hook, which comprises a winch, a pneumatic motor, a three position four-way hand-directional valve, a two position two-way pneumatic operated directional valve, a two position three-way pneumatic operated directional valve and a two position three-way pneumatic operated directional valve control mechanism, wherein the two output ends of a three position four-way pneumatic reversing valve are respectively connected with the two ends of the pneumatic motor; the output end of an air source is connected with the input end of the three position four-way pneumatic reversing valve through the two position two-way pneumatic operated directional valve; the output end of the air source is also connected with the input end of the two position three-way pneumatic operated directional valve; the output end of the two position three-way pneumatic operated directional valve is connected with the pneumatic control end of the two position two-way pneumatic operated directional valve, and the two position three-way pneumatic operated directional valve control mechanism is arranged on the upper side of a hook. The invention has the advantages of simple structure and low manufacturing cost, and the two position three-way pneumatic operated directional valve control mechanism consisting of a transmission steel wire rope and a hoisting block is adopted for limiting the hoist hook lifting, so the limiting problem when the marine pneumatic hoist hook is used for lifting under an explosion-proof environment is solved, and the lifting limit device can be applied to a movable type pneumatic hoist.

Description

technical field [0001] The invention relates to a marine lifting device, in particular to a pneumatic crane hook lifting limit device with an explosion-proof function, which belongs to the technical field of deck machinery. Background technique [0002] The winch of the pneumatic crane is driven by an air motor. It has the advantages of simple structure, low price, flexible space layout, and easy to make mobile. It is widely used on various ships. In some occasions where the use requirements are relatively high, the hook of the pneumatic crane must have a lifting limit function to prevent safety accidents. Existing hook lifting limit device has following two kinds: [0003] 1. Install the limit switch of the lifting stroke of the hook on the head of the boom. When the hook lifts and touches the limit switch, the contact of the limit switch is closed, and an electric control signal is sent through the relay to the motor connected to the drive winch. The two-position two-way...

AI Technical Summary

Problems solved by technology

[0005] The limit devices of the above two kinds of pneumatic cranes can meet the limit requirements of conventional pneumatic cranes. The components of the lifting limit device must use expensive explosion-proof components, resulting in a lot of cost increase; and the electronic control limit cannot work in the power-off state

In addition, the connecting cables of the electric control components cannot be moved, so they cannot be used in mobile pneumatic cranes

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