An automatic detection method for the opening degree of the crane hook

A technology of automatic detection and opening degree, which is applied in the direction of measuring devices, load hanging components, instruments, etc., can solve the problems of easy introduction of errors, high subjectivity, low measurement accuracy, etc., and achieves a high degree of automation and precision. Effect

Active Publication Date: 2021-03-26
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE +1
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AI Technical Summary

Problems solved by technology

Its limitations are: (1) Although the manual operation is flexible, it is highly subjective and easy to introduce errors, resulting in low measurement accuracy; (2) It is difficult to accurately select the reference point for manual measurement, and it is impossible to accurately determine the development of the deformation of the opening of the hook. Monitoring, Analysis and Early Warning
[0004] To sum up, the current crane hook opening degree detection still has some problems in the automation degree of the detection process, detection accuracy and practicability.

Method used

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  • An automatic detection method for the opening degree of the crane hook
  • An automatic detection method for the opening degree of the crane hook
  • An automatic detection method for the opening degree of the crane hook

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Embodiment

[0030] An automatic detection method for the opening degree of a crane hook, comprising the following steps:

[0031] 1) The point cloud and coordinate system of the hook collected by the three-dimensional measuring equipment are as follows: figure 1 As shown, the x and z axes are rightward and upward respectively, and the y axis can be determined by the right-hand rule. According to the distance between the hook and the background object in the measurement environment, reasonably set the threshold d0 to delete the noise data outside the hook.

[0032] 2) Traverse the points in the point cloud, search for the leftmost point A of the hook tip, and then search for the hook tip vertex B, and record the points above the hook tip as the set ptop, such as figure 2 shown.

[0033] 3) Calculate the reference point for measuring the opening:

[0034] First, calculate the center of gravity of all points in the set Among them, N is the number of points contained in the point set, a...

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Abstract

The invention discloses an automatic detecting method for the opening degree of a crane hook. The method comprises: carrying out denoising processing to remove point cloud data except a hook; carryingout point cloud traverse processing and carrying out searching to obtain a peak of a hook point; for data above the peak of the hook point, calculating a symmetric plane based on initial plane hypothesis, symmetric point set calculation and feature value decomposition techniques; carrying out projection of the data above the peak of the hook point on the symmetric plane and calculating a reference point for opening degree calculation; and calculating a distance between the reference point and the peak of the hook point to obtain an opening degree. Therefore, the error caused by the high subjectivity in the manual measurement can be eliminated; dependence on special shape of the top of the hook is eliminated; and the method has advantages of high precision, manual participation prevention,high applicability and the like.

Description

technical field [0001] The invention relates to the technical field of intelligent detection, in particular to an automatic detection method for the opening degree of a crane hook. Background technique [0002] Hoisting machinery is widely used in lifting, transportation, loading and unloading of various materials, and is an indispensable equipment for modern industrial production. As the stressed part of the crane, the hook is prone to serious safety accidents due to defects such as deformation. [0003] In order to ensure safe production, special equipment inspection and testing institutions need to conduct regular inspections of hooks in accordance with existing inspection standards and procedures. According to the "Lifting Machinery Safety Technology Supervision Regulations - Bridge Cranes" issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, when the opening is 15% larger than the original size, the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14B66C13/16
CPCB66C13/16G01B11/14
Inventor 张永举郭玲屈艺张伟郭健王初辉
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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