Crane strain monitoring method based on time-to-digital conversion technology

A technology of time-to-digital conversion and strain monitoring, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measuring device, load suspension components, etc., can solve the problems of labor-intensive, real-time monitoring, etc., and achieve high time measurement accuracy, Low power consumption and good stability

Inactive Publication Date: 2017-10-27
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE +1
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  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used supervision method for cranes is regular inspection by special personnel, which fails to achieve the purpose of real-time monitoring and consumes a lot of manpower

Method used

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  • Crane strain monitoring method based on time-to-digital conversion technology
  • Crane strain monitoring method based on time-to-digital conversion technology
  • Crane strain monitoring method based on time-to-digital conversion technology

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0026] exist figure 1 Among them, the charge and discharge capacitors are made of ceramic capacitors with high stability, which can improve the accuracy of time acquisition. The formula for capacitor charging and discharging time is: V low Voltage lower limit, V high is the upper limit of the voltage, R is the resistance value of the strain resistance, and C is the value of the ceramic capacitor. The ceramic capacitor will be charged and discharged on the two strain resistors of the half bridge respectively.

[0027] The strain calibration formula is: t 1 , t 2 are the charging and discharging time of the two strains, and K is the resistance sensitivity coefficient.

[0028] The remote monitoring terminal first obtains the two-dimensional stress spectrum of the stress data through the rainflow counting method. The general steps of the rainflow coun...

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Abstract

The invention discloses a crane strain monitoring method based on a time-to-digital conversion technology. According to the crane strain monitoring method, strain is collected by adopting the time-to-digital conversion technology, inclination angles and acceleration data collected through combination of a tilt angle sensor and a trajectory tracing sensor are sent to a microcontroller together, and the microcontroller transmits the data to a remote monitoring terminal through a 3G module; the remote monitoring terminal mainly realizes analysis for performance of a crane and is used for estimating remaining fatigue life with a rain-flow counting method, testing crane deformation and tracking a space trajectory. Compared with the prior art, the crane strain monitoring method adopts time variation to replace strain gauge resistance variation for strain measurement, an additional AD conversion circuit is not needed, and the system power consumption is reduced; data are transmitted in a 3G mode, data transmission is not limited by distance, meanwhile, the data are subjected to algorithm analysis, stress and deformation conditions of the crane are monitored in real time, and safe operation of the crane is guaranteed.

Description

technical field [0001] The invention belongs to the field of crane operation state monitoring, and relates to a method capable of monitoring the strain, inclination angle, space trajectory and other states of the crane. Background technique [0002] A crane refers to a multi-action hoisting machine that lifts vertically and carries heavy objects horizontally within a certain space. At present, as a kind of handling machinery, cranes are widely used in ports, construction sites, and industrial and mining enterprises. As hoisting machinery plays an increasingly important role in national production, the monitoring of crane status has attracted more and more attention. [0003] The biggest feature of crane work is to do intermittent movement, that is, the corresponding mechanisms for retrieving, moving, unloading and other actions in a working cycle work alternately. During the alternating cycle operation of the crane, the crane may experience stress fatigue and insufficient ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C13/16G01B7/16
CPCB66C13/16G01B7/18
Inventor 黄凯许建芹张一辉曹亚琪许飞云胡建中贾民平
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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