Crane static stiffness measuring method and device

A measurement method and technology of a measurement device, which are applied in the field of digital close-range measurement, can solve the problems of measurement result deviation, small deviation and large measurement error, etc., and achieve the effects of simplifying the measurement process, easy to use, and fast test speed.

Inactive Publication Date: 2018-09-04
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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Problems solved by technology

[0003] Traditional hoisting machinery static stiffness measurement methods include laser ranging system method, theodolite method, total station method, etc., but these methods have certain disadvantages. The vertical distance h1 between the plate and the ground, then lift the rated load, and read the vertical distance h2 between the ground and the lower cover plate of the girder displayed on the laser ranging system again, then h1-h2 is considered to be the maximum static deflect

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  • Crane static stiffness measuring method and device
  • Crane static stiffness measuring method and device
  • Crane static stiffness measuring method and device

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Embodiment 1

[0023] A method for measuring the static stiffness of a crane, with figure 1 As shown, the measurement device is mainly composed of an image acquisition system 4, an electric pan / tilt 5, an angle sensor 6, a tripod 7, a distance sensor 8, a control and display system 9, and a level bubble 10. The measurement method is to collect two times before and after the beam is loaded. The digital image of the target surface is calculated by the relevant algorithm before and after the deformation (image displacement), and then the actual displacement of the steel beam is calculated by measuring the distance and angle information; the specific steps are:

[0024] The image acquisition system 4 and the electronic control platform 5 are firmly installed on the tripod 7, and the tripod is placed on the side directly below the girder 2 of the crane 1, and the camera system can clearly image the lower edge of the girder;

[0025] Adjust the level of the tripod until the level bubble 10 is plac...

Embodiment 2

[0038] On the basis of the technical solution of Embodiment 1, a measuring device for the static stiffness of a crane includes an image acquisition system 4, a distance measuring sensor, an angle sensor 6 and a central processing unit, and the imaging system is used to collect digital images of the girder before and after the crane loads the hoisting object, The ranging sensor is used to measure the distance from the image acquisition system to the measured girder, the angle sensor is used to measure the elevation angle of the girder when the image acquisition system collects images, and the image acquisition system, the ranging sensor and the angle sensor transmit the measurement results to the of the central processing unit.

[0039] Preferably: the image acquisition system is composed of a long focal length imaging lens, an image acquisition sensor, and an image acquisition card; through the long focal length imaging lens and the image acquisition sensor, the area with bound...

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Abstract

The invention discloses a crane static stiffness measuring method, which belongs to the technical field of digital close range measurement. Digital images of a crane girder before and after loading ofthe crane are acquired respectively, based on a digital speckle correlation measurement technology, the number of moving pixels of steel beam digital images before and after deformation on the targetsurface of an image plane image sensor is calculated, an image distance and an included angle between an image acquisition system and a horizontal plane are measured, the system magnification is calculated, the actual displacement before and after loading of the crane girder is thus calculated, and a girder stiffness numerical value is obtained. The method and the device have the advantages of long distance, non contact and no need of pasting of a marker, and can be applied to displacement measurement under effects of displacement load along any point under the crane girder, the test result is high in precision, the use is convenient, and the test speed is quick.

Description

technical field [0001] The invention belongs to the technical field of digital close-range measurement, and in particular relates to a static stiffness measurement method and device. Background technique [0002] Stiffness is an important technical indicator for the safety of hoisting machinery, especially for large-span cranes, which have higher requirements for stiffness. Static stiffness is not only one of the main technical indicators for the design and control of hoisting machinery, but also an important basis for judging whether the hoisting machinery can operate safely At the same time, it is also a major item of daily inspection and testing. In the inspection, the measurement result of the static stiffness of the crane girder (inspecting the mid-span and lower deflection of the girder) is the most important judgment index to measure the safety performance of the crane girder. [0003] Traditional hoisting machinery static stiffness measurement methods include laser r...

Claims

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Application Information

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IPC IPC(8): G01M5/00
CPCG01M5/005
Inventor 袁健伟赵祖林包健田小丹陈庞渊尹浩杨勇
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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