Winch apparatus having automatic tension function

Abstract

To use pulleys and position sensors to automatically carry out the operations of winding up, winding out, and stopping and thereby easily add an automatic tension function to a generic winch, thus providing a low cost winch with a quick turn-around time. Two pulleys across which a wire rope spans are configured such that the distance between the pulleys can be modified in accordance with the tension of the wire rope. If the tension increases, the distance between the pulleys decreases and a position sensor operates, as a result of which the winch shifts to winding out operation and the distance between the pulleys is increased by the action of force from rodless cylinders. If the tension decreases, the distance between the pulleys increases and a different position sensor operates, as a result of which the winch shifts to winding up operation and the distance between the pulleys decreases. These operations to let out and pull in the wire rope are performed repeatedly on the basis of the operation of the two position sensors, thereby controlling the tension of the wire rope to a constant tension.

Description

technical field [0001] The present invention relates to a hoisting device that rotates a drum to wind a rope such as a steel cable on the drum, or retracts the rope from the drum, or instead of winding a rope such as a steel cable on the drum or withdraws the rope from the drum. In the hoisting device called an endless rope hoist (hereinafter, the hoisting device is referred to as the main body of the hoisting machine) that pulls or retracts the rope by clamping the rope with a hook, etc., the drum is retracted. The utility model has the function of automatically adjusting the tension of the rope when the main body of the hoist is performing an action, so that the rope is neither too loose nor too tense, that is, a hoist device with an automatic tensioning function. Background technique [0002] As a hoist device having an automatic tensioning function, the device described in Japanese Patent Laid-Open Publication No. Heisei 5-8768 can be cited as an example. [0003] The h...

AI Technical Summary

Problems solved by technology

[0010] Among the hoisting machine devices with automatic tensioning function described in the above-mentioned Japanese Patent Publication No. Heisei 5-8768, it is extremely difficult to transform a general-purpose hoisting machine device and use it as a hoisting machine device with this automatic tensioning function.

That is, the hoist device with automatic tensioning function described in the above-mentioned Japanese Patent Publication No. Heisei 5-8768 requires special design and special manufacture, so the price is extremely expensive, and delivery takes a long time

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