JPS6397597A - Slackness removing device for winding rope - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a device for removing slack in a hoisting rope in a hoisting device such as a crane.

(Prior Art) Conventional Hoisting Device A conventional hoisting device for hoisting a container lowers the spreader by operating a handle by a driver, and lands the spreader on the spreader. At this time, since the hoisting rope is let out from the time the spreader lands on the container until the hoisting drum stops, a phenomenon occurs in which the first hoisting rope becomes slack.

Next, when hoisting is performed with the spreader gripping the container, if the rope is loosened and hoisting at high speed all at once, a large impact will be applied to the mechanical system. The operator hoisted the container at low speed for each stretch, took up the slack in the hoisting rope, and then hoisted the container at high speed after the driver visually confirmed that the container had touched the ground.

(Problems to be Solved by the Invention) This conventional hoisting device relies on the driver's sense of operating the steering wheel to take up the slack in the hoisting rope and to check when the container is off the ground, resulting in extremely poor cargo handling efficiency. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hoisting rope slack removing device that has a simple configuration and improves cargo handling efficiency.

(Structure of the Invention) (Means for Solving the Problems) The present invention includes a position detector that detects a hoisting position, a rope slack calculation circuit that calculates a slack amount of a hoisting rope from this hoisting position, A memory circuit that stores the calculated slack amount of the hoisting rope, a ground breaking amount setting circuit that can be set arbitrarily, and an addition circuit that adds the memory amount of the memory circuit and the setting amount of the ground breaking amount setting circuit; A winding amount calculation circuit that calculates the winding amount of the hoisting rope from a hoisting command, and a comparison circuit that compares the set winding amount of the addition value of the adding circuit and the winding amount of the winding amount calculation circuit.

This comparator circuit also includes a determination circuit that determines whether or not the set amount of winding has been completed.

(Function) In a device configured in this way, the amount of the hoisting rope that is let out from when the spreader is detected to have landed on the floor until the hoisting drum stops is the amount of slack in the hoisting rope. The amount of payout of the hoisting rope can be calculated from the amount of change in position from the detection of the spreader landing until the hoisting drum stops. Remember to take up the slack in the rope.

In the next hoisting operation, if high-speed hoisting is performed only under the condition that the memorized amount of slack in the hoisting rope has been removed, the crane boom will This will cause a large impact on the mechanical system.

For this reason, it is necessary to detect that the container has broken off, so in order to detect this ground breaking, the amount of slack in the hoisting rope memorized previously, that is, the amount of slack in the hoisting rope, The cargo handling efficiency is improved by performing high-speed hoisting by adding the payout amount for ground cutting to the payout amount and using a comparison circuit to determine that this added area has been wound up in the next hoisting operation. becomes possible.

(Example) An embodiment of the present invention will be described below.

FIG. 1 shows a hoisting rope slack removing device consisting of primary components.

(a) Position detector 11 connected to the hoisting drum 10 and used to detect the first hoisting position (b) Rope connected to the position detector 11 and used to calculate the slack amount of the hoisting rope from the first hoisting position Rope slack amount calculation circuit 12 for calculating the amount of slack in (c) Spreader landing detection circuit 13 for detecting that the spreader 4 has landed on the container 5 (d) Connected to the calculation circuit 12, Memory circuit 14 for storing the calculated slack amount of the hoisting rope (E) Ground cutting amount setting circuit 15 that can be set arbitrarily (F)
An adder circuit 16 (g) connected to the memory circuit 14 and the ground cutting amount setting circuit 15 for adding the memory amount of the memory circuit 14 and the setting amount of the ground cutting amount setting circuit 15. A winding amount calculation circuit 18 for calculating the winding amount (h) connected to the addition circuit 16 and the winding amount calculation circuit 18;
Comparison circuit 19 for comparing the set winding amount of the adding circuit 16 and the winding amount of the winding amount calculating circuit 18.Next, the operation of the hoisting rope slack removing device constructed as described above will be explained.

The hoisting position is detected by a position detector 11, and the position signal from the first position detector 11 is input to a rope slack calculation circuit 12, which calculates the position from when the spreader is detected to when the hoisting drum stops. The amount of slack in the hoisting rope is calculated from the amount of change in . The amount of slack in the hoisting rope calculated by the calculation circuit 12 is input to the storage circuit 14, and is stored until a predetermined amount of winding is completed in the next hoisting operation. This storage amount is input to the adding circuit 16, where it is added to the setting amount of the ground cutting amount setting circuit 15, and the set winding amount of this added value and the winding amount of the winding calculation circuit 18 are compared to the comparison circuit 19. is input.

A comparison circuit 19 compares and determines whether the winding amount has reached the set amount, and if the one winding amount has reached the set amount, high-speed winding is started.

Since the present invention is constructed as described above, when the next hoisting operation is performed while the spreader 4 is landing on the container 5, it is possible to optimally switch from low speed hoisting to high speed hoisting.

〔Effect of the invention〕

In this way, not only can the cargo handling time be shortened, but also cargo handling can be carried out without applying excessive shock to the mechanical system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a slack removing device showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining the state of a hoisting rope. 10... Hoisting drum 11... Position detector 12... Rope slack amount calculation circuit 13... Spreader landing detection circuit 14... Memory circuit 15... Ground cutting amount setting circuit 16. ... Addition circuit 19 ... Comparison circuit agent Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] a position detector for detecting the hoisting position of the crane; a rope slack calculation circuit for calculating the slack amount of the hoisting rope from the hoisting position; and a memory circuit for storing the calculated slack amount of the hoisting rope; a ground cutting amount setting circuit that can set the ground breaking amount setting circuit; an adding circuit that adds the memory amount of the memory circuit and the setting amount of the ground cutting amount setting circuit; and a winding circuit that calculates the winding amount of the hoisting rope from a hoisting command. a comparison circuit that compares the set winding amount of the added value of the adding circuit and the winding amount of the winding calculation circuit;
A hoisting rope slack removing device comprising a determination circuit for determining whether or not a set amount of winding has been completed using the comparison circuit.