Calibration device and calibration method for large-load bolt fastening tool

Abstract

The invention relates to a calibration device and calibration method for a large-load bolt fastening tool. The fastening tool comprises a hydraulic wrench, a hydraulic pump and a tensile nut, whereinthe hydraulic wrench stretches a bolt to be processed in the axial direction of the bolt, the hydraulic pump is connected with the hydraulic wrench, one end of the tensile nut is connected with the hydraulic wrench, and the other end of the tensile nut is connected with the bolt to be processed. The tensile nut comprises an internal threaded sleeve and an external rotating sleeve arranged on the outer side of the internal threaded sleeve in a sleeved manner, and the end of one side of the external rotating sleeve is provided with a gasket. The calibration device comprises a rack, a hollow rotary oil cylinder and a detection assembly, wherein the hollow rotary oil cylinder is arranged on the rack and is used for allowing the bolt to be processed to penetrate through, and the detection assembly is used for measuring the pressure of the hydraulic pump and the oil cylinder. By means of the calibration device, metering calibration of the large-load bolt fastening tool can be realized conveniently, accuracy is high, traceability of value can be realized, and thus safe operation of a unit is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of calibration equipment, in particular to a large-load bolt fastening machine tool calibration device and a calibration method thereof. Background technique [0002] Most of the faceted bolts in the high-pressure and low-pressure cylinders of steam turbines use heating methods, which have low time efficiency and poor precision, and require repeated operations. At the same time, as the bolts are used at high temperatures for a long time, there will be aging phenomena, and the elastic modulus of the bolts will change slightly. The elongation of the bolts is different when the tightening torque is the same, which causes the bolts to be tightened repeatedly to meet the standard requirements. When the steam turbine is used as the critical path for maintenance, the overhaul period will be delayed. [0003] At present, the fastening method of the face bolts of the high-pressure cylinders of Units 1 and 2 of Daya B...

AI Technical Summary

Problems solved by technology

Although the work efficiency has been improved and the damage to the bolts has been reduced after the transformation, it has also brought new problems. This fastening tool is a new type of measuring instrument, and its accuracy and reliability directly affect the quality of bolt fastening and even the high-pressure cylinder. Therefore, it is necessary to trace the source of the value, but there is no domestic measurement institution with the verification capability or calibration device, which is a blank technology

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