CN210893931U

CN210893931U - Piezoelectric driving type fatigue test and detection device

Info

Publication number: CN210893931U
Application number: CN201921579557.XU
Authority: CN
Inventors: 田晓超; 王海刚; 闻人锴琦; 徐安俊; 杨志刚; 沈燕虎
Original assignee: Changchun University
Current assignee: Changchun University
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-06-30
Anticipated expiration: 2029-09-23

Abstract

The utility model relates to a piezoelectric drive formula fatigue test and detection device adopts the piezoelectric vibrator as driving power source, constitutes resonant system with preset load guiding mechanism, elastic support ring, load sensor, left anchor clamps, by test piece, right anchor clamps etc. under outside alternating voltage effect, the deformation of piezoelectric vibrator is enlarged and is acted on by the test piece through system resonance to the realization is to the reciprocal tensile fatigue test and the detection of little load and little load test piece. The whole structure adopts a transverse arrangement mode, and the influence of the quality of the clamp on the loading and detection precision can be avoided. The piezoelectric vibrator can adopt a ring-shaped single-chip bent vibrator structure or a double-chip bent vibrator structure, and can also adopt a rectangular single-chip bent vibrator structure or a double-chip bent vibrator structure.

Description

Piezoelectric driving type fatigue test and detection device

Technical Field

The utility model belongs to fatigue detection and test field, concretely relates to fatigue test and detection device based on piezoelectric vibrator driven and be used for little load and little load.

Background

With the continuous development of micro-electromechanical technology, the research on related micro actuators, micro drivers, micro sensors and the like is also extremely active, and some results have already formed products and are applied. The devices are generally characterized by small stress, high use frequency and common possibility of fatigue damage in work, and multiple fatigue tests and detections are needed in the development and production processes; in addition, the fatigue test and detection are required for the micro and small components frequently appearing in bionic engineering research and bionic products and biomedical products under alternating dynamic load during work. The appearance of these special performance components makes it increasingly important to have fatigue testing and detection techniques that can simulate the actual conditions and have good performance. The existing fatigue test and detection equipment is designed for large-size devices, generally adopts electromagnetic drive or electro-hydraulic servo drive, needs a system to work in a resonance state, is limited by system impedance and magnetic resistance, generally has the working frequency not higher than 200Hz, generally has the problems of large dynamic load, low loading precision and the like, and is not suitable for the fatigue test and detection of micro devices and biological devices at present.

The utility model provides an utilize piezoelectric vibrator as driving power source and overall structure adopts the transverse arrangement mode, can carry out reciprocal tensile fatigue test and detection to small device and biological device, can realize that the accuracy of alternating load is applyed and is controlled.

Disclosure of Invention

The utility model discloses a piezoelectric drive formula fatigue test and detection device adopts the piezoelectric vibrator as driving power source, constitutes resonant system with preset load guiding mechanism, elastic support ring, load sensor, left anchor clamps, tested piece, right anchor clamps, and under the effect of external alternating voltage, the deformation of piezoelectric vibrator is amplified and is acted on tested piece through system resonance; the testing device comprises a support plate, a right clamp, a left clamp, a right clamp, a load sensor, an elastic support ring, a rotating hand wheel, a load sensor, a moving sliding table, a load sensor, a rotating hand wheel, a load sensor and a vibration transmission rod, wherein the support plate is connected with a piezoelectric vibrator through a connecting ring; the guide pillar is fixed on the base, and is supported by 4 damping rubbers on the base, removes the slip table and slides from top to bottom at the guide pillar, and rotatory hand wheel is rotatory and takes place elastic deformation with the help of the threaded connection drive elasticity support ring of removing the slip table to form the initial stage loading to the piece under test, lock with lock nut after the loading.

Preferably, the piezoelectric vibrator adopts a ring-shaped single-chip bending vibrator structure or a ring-shaped double-chip bending vibrator structure, and can also adopt a rectangular single-chip bending vibrator structure or a double-chip bending vibrator structure.

Preferably, the pre-load adjusting mechanism is arranged for pre-statically loading the tested piece and mainly comprises a rotating hand wheel, a locking nut, a moving sliding table and a guide post.

Preferably, the whole structure adopts a transverse arrangement type, and the left clamp and the right clamp transversely clamp the tested piece.

The utility model has the advantages that: according to the preset state of the system, alternating loading with lower frequency can be simulated, and high-frequency and small-amplitude loading working conditions above 300Hz can be formed, so that higher alternating loading speed and control precision are realized, and the influence of the quality of the clamp on the loading precision is avoided due to the transverse arrangement of the whole structure. The device has the advantages of simple structure, small volume, no magnetic interference and no acceptance of magnetic interference, and can better perform alternating loading and high-frequency high-cycle fatigue performance detection on small and precise components.

Drawings

Fig. 1 shows a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the piezoelectric vibrator structure of the present invention, wherein fig. 2a is a ring-shaped single-chip vibrator structure, fig. 2b is a ring-shaped double-chip vibrator structure, fig. 2c is a rectangular single-chip vibrator structure, and fig. 2d is a rectangular double-chip vibrator structure.

Fig. 3 is a preset load adjusting mechanism of the present invention.

Detailed Description

The structure and principle of the piezoelectric driving type fatigue testing and detecting device of the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the piezoelectric driving fatigue test and detection device of the present invention employs a piezoelectric vibrator 7 as a driving force source, and forms a resonance system with a pre-load adjusting mechanism 1, an elastic support ring 2, a load sensor 3, a left clamp 4, a tested piece 5, and a right clamp 6, and under the action of external alternating voltage, the deformation of the piezoelectric vibrator 7 is amplified through system resonance and acts on the tested piece 5; the testing device comprises a supporting plate 10, a right clamp 6, a vibration transmission rod 9, a tested piece 5, a load sensor 3, a movable sliding table 103, a rotary hand wheel 101, a load sensor 3, a vibration transmission rod 9, a vibration transmission rod, a vibration sensor and a vibration damper, wherein the supporting plate 10 is connected with a piezoelectric vibrator 7 through a connecting ring 8; the guide post 104 is fixed on the base 11, the base 11 is supported by 4 damping rubbers 12, the movable sliding table 103 slides up and down on the guide post 104, the rotary hand wheel 101 rotates and drives the elastic support ring 2 to generate elastic deformation by means of the threaded connection of the movable sliding table 103, so as to form initial loading on the tested piece 5, after loading, the elastic support ring is locked by the locking nut 102, the preset load adjusting mechanism 1 is arranged for carrying out static loading on the tested piece in advance, and mainly comprises the rotary hand wheel 101, the locking nut 102, the movable sliding table 103 and the guide post 104, the whole structure adopts a transverse arrangement type, and the left clamp 4 and the right clamp 6 transversely clamp the tested piece 5.

The movable sliding table 103 can slide up and down on the guide post 104, and the rotating hand wheel 101 applies pretightening force to the tested piece 5 through the thread structure, the elastic support ring 2, the load sensor 3 and the left clamp 4, so as to provide initial loading for the tested piece 5, and is locked by the locking nut 102 after the initial loading. When external alternating voltage acts on the piezoelectric vibrator 7, the deformation of the piezoelectric vibrator 7 is amplified through system resonance and converted into alternating load to act on the tested piece 5, and the load sensor 3 extracts static and dynamic stress data, so that the reciprocating tensile fatigue test and detection of the test piece are realized.

Referring to fig. 2, the present invention is a schematic diagram of a piezoelectric vibrator. The piezoelectric vibrator 7 converts alternating voltage into alternating deformation or alternating load by utilizing an inverse piezoelectric effect, has small deformation per se, and amplifies the alternating voltage by depending on a system resonance principle so as to provide excitation for a system. The piezoelectric vibrator 7 may be a single-chip bending vibrator (fig. 2a) with a ring-shaped single-sided mounted piezoelectric ceramic, a double-chip bending vibrator (2b) with a ring-shaped double-sided mounted piezoelectric ceramic, a single-chip bending vibrator (fig. 2c) with a rectangular single-sided mounted piezoelectric ceramic, or a double-chip bending vibrator (2d) with a rectangular double-sided mounted piezoelectric ceramic.

Referring to fig. 3, the present invention is a schematic diagram of a preload adjustment mechanism. The movable sliding table 103 can move up and down on the guide post 104, the movable sliding table 103 comprises a through thread 103(a) and a locking screw 103(b), and the locking screw 103(b) is used for locking the movable sliding table. The rotary hand wheel 101 is in threaded connection with the movable sliding table 103, the other end of the rotary hand wheel is connected with the elastic support ring 2, and the rotary hand wheel 101 is in threaded connection to initially load a tested piece and is locked by the locking nut 102.

Claims

1. Piezoelectric drive formula fatigue test and detection device, its characterized in that: the method comprises the following steps that a piezoelectric vibrator (7) is used as a driving force source, and forms a resonance system with a preset load adjusting mechanism (1), an elastic support ring (2), a load sensor (3), a left clamp (4), a tested piece (5) and a right clamp (6), and under the action of external alternating voltage, the deformation of the piezoelectric vibrator (7) is amplified through system resonance and acts on the tested piece (5); the device comprises a support plate (10), a piezoelectric vibrator (7), a right clamp (6), a vibration transmission rod (9), a tested piece (5), a left clamp (4) and a right clamp (6), wherein the support plate (10) is connected with the piezoelectric vibrator (7) through a connecting ring (8), the right clamp (6) is fixedly connected with the piezoelectric vibrator (7), one end of the right clamp (6) is connected with the vibration transmission rod (9), the tested piece (5) is clamped and fixed by the left clamp (4) and the right clamp (6), the left clamp (4) is connected with an elastic support ring (2) through a load sensor (3), and a rotary hand wheel (101) is; the guide post (104) is fixed on the base (11), the base (11) is supported by 4 damping rubbers (12), the movable sliding table (103) slides up and down on the guide post (104), the rotary hand wheel (101) rotates and drives the elastic support ring (2) to generate elastic deformation through threaded connection of the movable sliding table (103), so that initial loading on the tested piece (5) is formed, and the tested piece is locked by the locking nut (102) after the loading.

2. The piezo-electrically driven fatigue testing and detecting apparatus of claim 1, wherein: the piezoelectric vibrator (7) adopts a ring-shaped single-chip bent vibrator structure or a ring-shaped double-chip bent vibrator structure, and can also adopt a rectangular single-chip bent vibrator structure or a double-chip bent vibrator structure.

3. The piezo-electrically driven fatigue testing and detecting apparatus of claim 1, wherein: the pre-load adjusting mechanism (1) is arranged for carrying out static loading on a tested piece in advance and mainly comprises a rotating hand wheel (101), a locking nut (102), a moving sliding table (103) and a guide post (104).

4. The piezo-electrically driven fatigue testing and detecting apparatus of claim 1, wherein: the whole structure adopts a transverse arrangement type, and the left clamp (4) and the right clamp (6) transversely clamp the tested piece (5).