Device and method for detecting winch rope outlet length and method for obtaining height of lifting hook from ground

Abstract

The invention discloses a device and method for detecting the winch rope outlet length and a method for obtaining the height of a lifting hook from the ground and relates to the technical field of lifting detection. By means of the device and method for detecting the winch rope outlet length and the method for obtaining the height of the lifting hook from the ground, automatic detection of the winch rope outlet length can be realized, the device comprises a speed measurement sensor, an ascending mouth pressure sensor, a descending mouth pressure sensor and a controller, wherein the speed measurement sensor obtains the winch rotation pulse number, the ascending mouth pressure sensor obtains winch ascending signals, the descending mouth pressure sensor obtains winch descending signals, the controller is in electrical connection with the speed measurement sensor, the ascending mouth pressure sensor and the descending mouth pressure sensor correspondingly, when the ascending mouth pressuresensor generates the signals, the speed measurement sensor is obtained as the positive pulse number; and when the descending mouth pressure sensor generates the signals, the speed measurement sensoris obtained as the negative pulse number, and then the winch rope outlet length is obtained. By means of the device, the pulse number and direction of winch rotation can be measured, so that the winchrope outlet length of a crane lifting mechanism in working is detected, and then the height of the lifting hook from the ground is detected, automatic detection can be realized, and the device is simple in structure and accurate in measurement.

Description

technical field [0001] The invention relates to the technical field of hoisting detection, in particular to a device and method for detecting the length of a hoisting rope and a method for obtaining the height of a hook from the ground. Background technique [0002] When the hoist in the hoisting mechanism is working, it is necessary to accurately measure the length of the wire rope on the hoist, so as to detect the height of the hook from the ground when the hoisting mechanism of the crane is working, and realize the monitoring of the safety status of the crane. There is no hoist in the prior art. The height of the hook from the ground is displayed or displayed inaccurately. The height of the hook from the ground is mainly visually measured by the operator based on experience. However, for some special working conditions, the operator cannot see the position of the hook and does not know the height of the hook at all. [0003] There are two traditional measurement methods: ...

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Problems solved by technology

[0002] When the hoist in the hoisting mechanism is working, it is necessary to accurately measure the length of the wire rope on the hoist, so as to detect the height of the hook from the ground when the hoisting mechanism of the crane is working, and realize the monitoring of the safety status of the crane. There is no hoist in the prior art. The height of the hook from the ground is displayed or displayed inaccurately. The height of the hook from the ground is mainly measured visually by the operator based on experience. However, for some special working conditions, the operator cannot see the position of the hook and does not know the height of the hook at all.

[0003] There are two traditional measurement methods: 1. Install a coaxial encoder on the side of the drum to measure the number of forward and reverse rotations of the winch, and calculate the length of the rope from the winch. This method requires that one side of the drum can be coaxial. Install the encoder, and for some working conditions, the encoders cannot be installed coaxially on both sides, and the coaxiality requirements are relatively high; 2. The ring gear is installed on the side of the drum, and the orthogonal signal is used to calculate the positive and negative signals of the hoist and The number of pulses is used to calculate the length of the rope. This method needs to design a ring gear on the side of the winch mechanism. For a winch without a ring gear structure, it is impossible to install an orthogonal signal sensor

[0004] Patent CN207132821U discloses a crane steel wire rope length measuring device, including measuring rollers and two sets of wire rope positioning idlers, two sets of wire rope reel drive discs and a digital counter; two sets of wire rope reel drive discs are equipped with wire rope The reels are respectively located on both sides of the measuring rollers, and the two sets of wire rope reel driving discs are equipped with drive motors, and the steel wire ropes set on the two wire rope reels pass through the measuring rollers. The digital counter for the number of turns is a device for measuring the length of the crane wire rope mechanically. The structure of the patent is complex and the measurement is not accurate enough. It is not suitable for the measurement of the length of the rope out of the safety monitoring system and the height of the hook from the ground.

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