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Unlockable nut in paster-type cantilever beam composite bending-vibration working mode

A working mode, cantilever beam technology, applied in the direction of nuts, screws, bolts, etc., can solve the problems of limiting the application of threaded fasteners and transmission parts, high production costs, cumbersome operations, etc., to achieve simple structure and low production cost , Expand the effect of the application field

Inactive Publication Date: 2015-02-18
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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  • Unlockable nut in paster-type cantilever beam composite bending-vibration working mode
  • Unlockable nut in paster-type cantilever beam composite bending-vibration working mode

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Experimental program
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Effect test

specific Embodiment approach 1

[0009] Specific implementation mode one: see figure 1 , figure 2 To illustrate, this specific embodiment is composed of a nut base 1 in a cantilever beam state and a plurality of other-excited telescopic sheets 2;

[0010] 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 inner surface of the nut base 1 in the cantilever beam state is provided with an internal thread 1-3, and the internal thread 1-3 of the nut base 1 in the cantilever beam state is rotatably connected with a screw 1-4, and the internal thread 1- The thread lead angle of 3 is smaller than the equivalent friction angle between the internal thread 1-3 and the screw 1-4 connecting thread pair; on the outer circular surface of the nu...

specific Embodiment approach 2

[0011] Specific implementation mode two: see figure 1 , figure 2 To illustrate, the difference between this embodiment and the first embodiment is that the other-excited elastic sheet 2 is a piezoelectric elastic sheet, and its driving frequency coincides with or is close to the resonance frequency of the nut base 1 in the state of the cantilever beam. The nut matrix 1 in the state of excited cantilever beam is in the state of ultrasonic vibration; the piezoelectric telescopic The driving electric signal waveform of the chip can be a sine wave alternating current signal, a square wave alternating electric signal, a triangular alternating current signal or a sawtooth alternating electric signal. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Specific implementation mode three: see figure 1 , figure 2 To illustrate, the difference between this embodiment and the first embodiment is that the extensible stretchable sheet 2 is a magnetostrictive sheet, a photostrictive sheet or a thermostrictive sheet. Other compositions and connections are the same as in the first embodiment.

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Abstract

The invention discloses an unlockable nut in a paster-type cantilever beam composite bending-vibration working mode, and belongs to the field of fasteners and transmission members connected by screw thread pairs. The unlockable nut achieves switching and controlling of a self-locking working state and an unlocking working state of screw thread pairs conveniently, quickly and flexibly. A plurality of planes arranged in a pairwise opposite manner are arranged circumferentially on an external circumferential surface of a nut matrix in a cantilever beam state of the unlockable nut; each plane is provided with a separate-excitation extension piece; planes of the separate-excitation extension pieces are connected with the planes; extension directions of the separate-excitation extension pieces are parallel to an axis of the nut matrix in the cantilever beam state; and separate-excitation drive modes of the separate-excitation extension pieces are a travelling wave vibration excitation working mode or a standing wave vibration excitation working mode. According to the unlockable nut, the self-locking working state of the nut matrix can be changed to the unblocking working state when the separate-excitation extension pieces input separate-excitation drive signals, that is a friction coefficient between the screw thread pairs is reduced greatly, so that the self-locking working state between the nut matrix and a screw rod disappears.

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 Patents(China)
IPC IPC(8): F16B37/00F16B39/00F16H25/24
Inventor 程廷海包钢唐晚静
Owner HARBIN INST OF TECH