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Sandwich type cantilever beam torsional vibration operating mode unlockable nut

A working mode and torsional vibration technology, which is applied in the direction of nuts, screws, bolts, etc., can solve the problems of limiting the application occasions of threaded fasteners and transmission parts, high production costs, cumbersome operations, etc., and achieves simple structure and low production cost , Expand the effect of the application field

Inactive Publication Date: 2013-06-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the conversion and control of the two working states of self-locking and unlocking between thread pairs, it is often necessary to use a self-locking nut with self-locking function and a corresponding unlocking mechanism to work together. The self-locking and unlocking state conversion mechanism has problems such as complex structure, cumbersome operation, and high production cost, which limits the application occasions of threaded fasteners and transmission parts

Method used

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  • Sandwich type cantilever beam torsional vibration operating mode unlockable nut
  • Sandwich type cantilever beam torsional vibration operating mode unlockable nut
  • Sandwich type cantilever beam torsional vibration operating mode unlockable nut

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Experimental program
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Effect test

specific Embodiment approach 1

[0010] Specific implementation mode one: see figure 1 , figure 2 , image 3 To illustrate, this specific embodiment is composed of a nut base 1 in a cantilever state and a piezoelectric torsion ring 2;

[0011] The nut base 1 in the cantilever beam state adopts the cantilever beam restraint method, and the nut base 1 in the cantilever beam state has a T-shaped design structure, and its T-shaped large-diameter end adopts the cantilever beam restraint mode and is processed with several positioning holes for installation and fixing. 1-2; the T-shaped small-diameter outer surface is provided with a circumferential groove 1-4, the inner surface of the nut base 1 in the cantilever beam state is provided with internal threads 1-3, and the nut base 1 in the cantilever beam state The screw rod 1-1 is rotationally connected to the internal thread 1-3, and the thread rise angle of the internal thread 1-3 is smaller than the equivalent friction angle between the internal thread 1-3 a...

specific Embodiment approach 2

[0012] Specific implementation mode two: see figure 1 , figure 2 , image 3 To illustrate, the difference between this embodiment and the first embodiment is that the driving frequency of the piezoelectric torsion piece 2-1 coincides with or is close to the resonance frequency of the nut base 1 in the cantilever state, so as to excite the cantilever state. The nut base 1 is in the state of ultrasonic vibration; the driving electrical signal waveform of the piezoelectric torsion plate 2-1 can be a sinusoidal alternating current signal, a square alternating current signal, a triangular alternating current signal or a zigzag alternating current signal. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific implementation mode three: see figure 1 , figure 2 , image 3 To illustrate, the difference between this embodiment and the first embodiment is that the internal thread 1-3 of the nut base 1 and the external thread of the screw 1-1 in the state of the cantilever beam can be trapezoidal threads, triangular threads, rectangular threads, serrations thread, pipe thread or non-standard thread. Other compositions and connections are the same as in the first embodiment.

[0014] Working principle: The unlockable nut in the torsional vibration working mode of the sandwich cantilever beam mainly excites the unlockable nut in a high-frequency (generally greater than 1000 Hz) micro-vibration state through the piezoelectric torsion plate 2-1. The generated anti-friction effect reduces the friction coefficient between the unlockable nut and the screw rod, and destroys the self-locking condition between the thread pairs, so that the unlockable nut is in the unlocking w...

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Abstract

The invention relates to a sandwich type cantilever beam torsional vibration operating mode unlockable nut, and belongs to the field of fasteners and driving media by means of screw thread pair connection. The sandwich type cantilever beam torsional vibration operating mode unlockable nut aims at conveniently, fast and flexibly achieving conversion and control of a self locking operating state and an unlocking operating state between screw thread pairs. The sandwich type cantilever beam torsional vibration operating mode unlockable nut is provided with a nut base body in a cantilever-beam state. A circle of circular groove is formed in the outer circle face of the nut base body in a cantilever-beam state, a piezoelectric torsional circular ring is composed of a plurality of piezoelectric torsional pieces and is embedded in the circular groove of the nut base body in a cantilever-beam state, two side end faces of the piezoelectric torsional circular ring are respectively connected with those in the circular groove, all piezoelectric torsional pieces can drive in an alone or group mode, and driving phase positions are the same when driving in a group mode. By means of the sandwich type cantilever beam torsional vibration operating mode unlockable nut, when the piezoelectric torsional pieces input driving signals, a self locking operating state of the nut base body can be converted into an unlocking operating state, namely, frictional coefficients between the screw thread pairs are greatly reduced, and therefore the self locking operating state between the nut base body and a threaded rod can disappear.

Description

technical field [0001] The invention belongs to the field of fasteners and transmission parts connected by thread pairs. Background technique [0002] Fasteners and transmission parts based on thread pairs are widely used in equipment, systems, devices and mechanisms in various industries today. For the thread pair connection pair, there are mainly two working states, which are the thread self-locking state and the non-self-locking state, and the latter can also be called the unlocking state. For the self-locking working state of the thread pair, the thread pair used should generally meet the thread self-locking conditions, that is, the thread lead angle is smaller than the equivalent friction angle between the thread pairs. The main application occasions are fastening of parts, sliding transmission guide rails and Jacks and other aspects of force transmission; for the unlocking working state of the thread pair, that is, satisfying that the thread lift angle is greater than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B37/00F16B39/02F16H25/24H02N2/00
Inventor 程廷海包钢刘士明孟丽霞
Owner HARBIN INST OF TECH