Device and method for measuring pretightening force of bolt

Abstract

The invention discloses a device and a method for measuring a pretightening force of a bolt. The device comprises a holed bolt, and three temporarily pressed sheets, a specially-made nut, a pressure tester and a nut which sleeve the holed bolt are mutually overlapped sequentially from the top to the bottom, wherein a reserved hole in the holed bolt stretches out of the bottommost temporarily pressed sheet; a pin is horizontally inserted into the reserved hole in the holed bolt and stretches out along the two side walls of the holed bolt; a reserved groove in the specially-made nut sleeving the holed bolt is butted with the pin; the inside diameter of the pressure tester sleeving the holed bolt is greater than the outside diameter of the holed bolt, and the pressure tester does not contact the side wall of the holed bolt; the nut is screwed at the tail end of the holed bolt. The device calculates the pretightening force of the bolt by sequentially twisting the nut and the specially-made nut to stretch the bolt twice. The device improves the method for measuring the pretightening force of the bolt, improves the accuracy for measuring the pretightening force of the bolt, and finally measures a more accurate pretightening force, so that in the actual using process, the device is more convenient.

Description

Technical field [0001] The invention relates to a device and a method for measuring the pre-tightening force of a bolt, in particular to a device and a method that can accurately measure the pre-tightening force of a bolt without being affected by external factors during the measurement process. Background technique [0002] The scope of application of bolts is extremely wide. In daily life and industrial production and manufacturing, bolts are indispensable connecting components, so bolts are also called industrial meters. The application range of bolts are: electronic products, mechanical products, digital products, electrical equipment, electromechanical products. Bolts are also useful in ships, vehicles, water conservancy projects, and even chemical experiments. As a kind of fastening device, bolts are used in aerospace, construction, automobile manufacturing, medical equipment and other fields to precisely control the pre-tightening force of bolts. Aiming at the defect of ...

AI Technical Summary

Problems solved by technology

Therefore, under the influence of friction factor and geometric parameter deviation, the control accuracy of bolt pretightening force is not in place, and the error will generally reach about 40%, so this method can only be used in occasions where general sealing requirements are not high.

[0022] 2. The method of measuring the pre-tightening force of the bolt by measuring the elongation of the bolt. In practical engineering problems, it is very inconvenient to measure the elongation of the bolt. This method is generally used in occasions that require strict control of accuracy.

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