Screw rod and threaded hole perpendicularity test tool with same

Abstract

The invention relates to a screw rod and a threaded hole perpendicularity test tool with the same. The screw rod comprises a central screw rod body, a taper sleeve, at least two external threaded blocks evenly distributed on the periphery of the taper sleeve in the circumference direction, and an elastic maintaining structure used for hooping the external threaded blocks on the peripheral face of the taper sleeve. A threaded part used for being connected with the central screw rod body in a threaded mode is arranged in the taper sleeve, the peripheral face of the taper sleeve is an external taper face with the small end and the large end distributed in the axial direction of the central screw rod body, the external threaded blocks are provided with external threads coaxial with the central screw rod body, the external threaded blocks and the taper sleeve are matched in the axial direction of the central screw rod body in a rotation-stopping movement mode, and the external threaded blocks are further provided with inner taper faces which are matched with the external taper face of the taper sleeve and are subjected to radial opening acting force under the axial moving effect of the taper sleeve. The central screw rod body is rotated to enable the external threaded blocks to be expanded and retracted, so that the diameter of the circumferential face where the external threaded blocks are located is changed, and when the screw rod is used for carrying out threaded hole perpendicularity testing, the radial gap generated when the screw rod is connected with a tested threaded hole can be eliminated, and precision of a testing result is 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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