Micro-torque and large-pressure nut

Abstract

A micro-torque and large-pressure nut comprises a nut shell, set screws, sliding columns and a hold-down ring, wherein the lower end face of the nut shell is provided with a circle of hold-down ring groove, a circle plastic ring groove is upwards formed along the hold-down ring groove, a plurality of sliding column holes with hole axes parallel to the axis of the nut are evenly and upwards distributed along the plastic ring groove, each sliding column hole is upwards provided with a screw hole, the set screws are arranged in the screw holes, the sliding columns are arranged in the sliding column holes, the plastic ring groove is internally full of liquid plastic, and the hold-down ring is arranged in the hold-down ring groove. According to the micro-torque and large-pressure nut, by meansof a compression force applying manner that the set screws are used for pushing the sliding columns to enter the liquid plastic and combination with the hold-down ring, when the nut is used for carrying out fastening, only axial pressing force exists in the pressing process, the nut is not subjected by any force in other directions, the clamping and positioning precision of a part is guaranteed, meanwhile, the labor intensity of operators is also reduced, in addition, the effects of large torque and large radial force generated by using a traditional nut on the clamping and positioning precision of the part are avoided, and the compressing reliability is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a micro-torque high-pressure nut. Background technique [0002] At present, when broaching the tenon and groove of the aero-engine wheel, the pressure plate of the puller is axially compressed by ordinary large hexagonal nuts, and the nut specifications are usually selected from M24 to M30. In order to meet the requirements of the pressing force, it is necessary to apply a large torque to the nut when tightening the hexagonal nut. The result of the artificial force and the force arm becomes a torque and radial tension. Excessive torque will cause the screw to have elastic torsional deformation. The screw springs back after torque application is stopped, resulting in a reduction in compaction force. The radial force will cause a slight radial displacement of the processed wheel, which directly affects the positioning accuracy of the wheel on the fixture. Contents ...

AI Technical Summary

Problems solved by technology

In order to meet the requirements of the pressing force, it is necessary to apply a large torque to the nut when tightening the hexagonal nut. The result of the artificial force and the force arm becomes a torque and radial tension. Excessive torque will cause the screw to have elastic torsional deformation. Screw springs back after torque application is stopped, resulting in reduced compression force

The radial force will cause a slight radial displacement of the processed wheel, which directly affects the positioning accuracy of the wheel on the fixture

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