Screw rod and threaded hole verticality inspection tool using the screw rod

Abstract

The invention relates to a screw rod and a threaded hole verticality inspection tool using the screw rod, comprising a central screw rod, a taper sleeve, at least two external thread blocks uniformly distributed on the periphery of the taper sleeve along the circumference, and tightening each external thread block inside The elastic retaining structure on the outer peripheral surface of the tapered sleeve has a threaded part connected with the central screw thread inside the tapered sleeve. The outer peripheral surface of the tapered sleeve is an outer tapered surface with a large end and a small end distributed along the axial direction of the central screw. Each external thread block has a The external thread provided on the central screw axis, the external thread block and the tapered sleeve move along the axial direction of the central screw to prevent rotation. Under the action, the inner cone surface is subjected to radial opening force. In the present invention, the expansion and contraction of the external thread block is changed by rotating the central screw to change the diameter of the circumferential surface of the external thread block. When the screw is used to detect the verticality of the threaded hole, the radial gap when the screw is connected to the measured threaded hole can be eliminated. Therefore, the accuracy of the detection result can be improved.

Description

technical field [0001] The invention relates to a screw rod and a threaded hole perpendicularity inspection tool using the screw rod. Background technique [0002] Existing inspection tools for detecting the verticality of threaded holes, such as the Chinese patent "Checking Tool for Verticality of Threaded Holes" with the authorized announcement number CN 201302442Y, include a cylindrical reference seat with a screw hole in the center and a threaded hole installed in the center of the inspection tool. For the detection screw in the screw hole of the reference base, the position where the reference base deviates from the screw hole is also provided with a through hole for wearing a dial indicator. The probe of the dial indicator passes through the through hole and is used to contact the end surface of the threaded hole to be measured. When testing, screw the detection screw into the threaded hole to be tested, set the reference base on the detection screw, make the probe of ...

AI Technical Summary

Problems solved by technology

The inspection tool adopts the detection screw of the same specification to cooperate with the thread of the threaded hole to be tested for detection, but due to processing errors, there is often a certain radial gap in the cooperation between the threaded hole to be tested and the detection screw, resulting in the relative radial deviation of the detection screw , affecting the accuracy of the detection results

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