Jack demarcating and calibrating methods

Abstract

The invention provides jack demarcating and calibrating methods. According to the demarcating method, a target demarcating oil pressure value is set, pressure is acted on a jack till the target demarcating oil pressure value is reached, the tensioning force of the jack displayed by a calibration device is recorded, and relation between the oil pressure and the tensioning force of the jack is obtained via fitting according multiple target demarcating oil pressure values and the corresponding tensioning forces of the jack. According to the calibrating method, a target tensioning force value for calibrating the jack is set, the target tensioning force is converted into a corresponding target calibration oil pressure according to a calibration result, pressure is acted on the jack according to the target calibrating oil pressure, and the target calibrating oil pressure is adjusted if necessary till tensioning force value displayed by the calibration device equals the target force value which is set initially. The demarcating method is automatically used in a system composed by the jack and the calibration device, and the demarcating result is accurate and reliable; and the calibration method is automatically used on the basis of the demarcating method, and the calibration result is accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of jack testing, and relates to a jack calibration and calibration method. Background technique [0002] Currently, the calibration of jacks generally includes two methods: passive calibration and active calibration. In the passive calibration method, before calibration, the jack is pumped into a part of the hydraulic oil, then the oil pump is turned off and the jack inlet and outlet valves are tightened; the calibrated equipment is passively pressured, according to, for example, 0--20% δ--40% δ--60 %δ--80%δ--100%δ (among them, δ is the nominal tension value of the jack, which is selected as the maximum calibration jack tension value set here) as a cycle, record the oil pressure at the corresponding point Table data, three cycles and record the corresponding oil pressure gauge data, and finally calculate the calibration equation through the computer, that is, the relationship function between jack tension a...

AI Technical Summary

Problems solved by technology

The oil pressure gauge of this method is manually read, and the error is relatively large; and although the active pressure is consistent with the scene, the manual operation of the oil pump cannot accurately control the tension of the jack at the corresponding target point, and the error is too large

[0004] It can be seen that the calibration method of the jack in the prior art has large errors, low precision and cannot be performed automatically.

Also because of this, the prior art cannot automatically and accurately calibrate the jack according to the calibration results

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