CN112104258A - Clamp type inertia piezoelectric linear motor - Google Patents

Abstract

The invention discloses a clamp-type inertial piezoelectric linear motor, comprising a stator fixing frame and an output rod. The stator fixing frame is a hollow structure, and two ends of the stator fixing frame are respectively connected with a left lever and a right lever. The ends are respectively provided with an upper clamp block and a lower clamp block, and a wedge block is placed between the two lower clamp blocks; an annular laminated piezoelectric ceramic is arranged in the stator fixing frame, and the upper end of the annular laminated piezoelectric ceramic is in contact with each other. Relying on the inner surface of the upper end of the stator fixing frame, the lower end of the annular laminated piezoelectric ceramics abuts the upper end of the wedge block, and the output rod goes down through the stator fixing frame, the annular laminated piezoelectric ceramics, and the wedge block in turn, and the lower end of the output rod extends downward. out the wedge. The stator in the inertia piezoelectric linear motor of the present invention adopts a clamp-type structure, and the left and right levers can be adjusted to meet different precision requirements; at the same time, the clamp-type structure can achieve high precision while increasing the clamp and output during operation. The positive pressure and friction between the rods increase the output thrust.

Description

A clamp type inertia piezoelectric linear motor

technical field

The invention belongs to the technical field of piezoelectric precision actuation, in particular to a clamp-type inertia piezoelectric linear motor.

Background technique

Piezoelectric linear motors have the characteristics of high positioning accuracy, fast response speed, flexible design, and immunity to electromagnetic interference. They have broad application prospects in the emerging frontier science and technology fields. In recent years, piezoelectric linear motors have developed rapidly under the extensive attention of researchers from many countries. According to the principle, piezoelectric motors can be divided into resonant and non-resonant motors. In resonant motors, the vibrating body is driven by the signal of the ultrasonic frequency frequency, and generates micro-amplitude vibration through modal coupling, and relies on friction to drive the motor. The motor produces a large-stroke motion, and the use of the coupled mode reduces the stability of the motor's motion.

Non-resonant piezoelectric motors can be further divided into piezoelectric driven walking motors and inertial driven motors, piezoelectric driven walking motors, also known as inchworm motors, and multiple piezoelectric actuators are used for alternate clamping and moving Mover; In inertial piezoelectric motors, the motion comes from the asymmetric excitation of the input signal, which belongs to the single-phase drive mode. The inertial piezoelectric motor has a simple structure and high precision, and is widely used in optics, biomedicine and intelligent manufacturing. and other cutting-edge high-end equipment. However, there are currently constraints on the performance of this type of motor: although the motor has high precision, its thrust is small and it is difficult to bear the working load.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a clamp-type inertia piezoelectric linear motor with flexible design, small size and large thrust-to-weight ratio, aiming at the above-mentioned deficiencies of the prior art.

In order to realize the above-mentioned technical purpose, the technical scheme adopted in the present invention is:

A clamp-type inertial piezoelectric linear motor, which includes a stator fixing frame and an output rod, the stator fixing frame is a hollow structure, two ends of the stator fixing frame are respectively connected with a left lever and a right lever, the left lever and The upper and lower ends of the right lever are horizontally provided with an upper clamp block and a lower clamp block, and a wedge block is placed between the two lower clamp blocks.

The stator fixed frame is provided with annular laminated piezoelectric ceramics, the upper end of the annular laminated piezoelectric ceramics abuts on the inner surface of the upper end of the stator fixed frame, and the lower end of the annular laminated piezoelectric ceramics abuts against the wedge. At the upper end of the block, the output rod passes through the stator fixing frame, the annular laminated piezoelectric ceramic, and the wedge block downward in sequence, and the wedge block is protruded from the lower end of the output rod.

In order to optimize the above technical solutions, the specific measures taken also include:

Further, the end faces of the two upper clamp blocks close to each other are vertical planes and inclined planes from top to bottom, the two inclined planes form a figure-eight shape, and the distance between the two clamp blocks is greater than the cross-sectional diameter of the output rod.

Further, the distance between the two upper clamping blocks is smaller than the distance between the two lower clamping blocks.

Further, the shape of the two wedge surfaces of the wedge block is consistent with the shape of the end surface of the lower clamping block that is in contact with correspondingly.

Further, the end faces of the two lower clamping blocks that are close to each other are in the shape of an inverted figure.

Further, the left lever and the right lever are respectively flexibly hinged with the stator fixing frame through the left straight beam and the right straight beam.

Further, the upper end of the stator fixing frame is provided with an upper through hole, the lower end is provided with a lower through hole, the annular laminated piezoelectric ceramic is provided with a first through hole, the wedge block is provided with a second through hole, and the upper through hole is provided with a second through hole. The centers of the hole, the lower through hole, the first through hole and the second through hole are all on the same vertical line, the upper through hole is smaller than the lower through hole, the upper through hole, the first through hole and the second through hole are all on the same vertical line. The sizes are the same, the output rod passes through the first through hole and the second through hole in sequence from the upper through hole downward, and the annular laminated piezoelectric ceramic passes through the lower through hole and abuts against the wedge.

Further, under the sawtooth wave electrical signal, the ring-shaped laminated piezoelectric ceramics stretches and pushes the wedge block down to open the left two lower clamp blocks, so that the two upper clamp blocks at the upper ends of the left lever and the right lever are close to each other. Tighten the output rod, and push the output rod in the axial direction to make a linear motion.

Beneficial effects of the present invention:

The stator in the inertial piezoelectric linear motor of the present invention adopts a clamp-type structure, and the left and right levers can be flexibly designed according to actual purposes to meet different precision requirements; at the same time, the clamp-type structure can achieve high precision while increasing the work force. The positive pressure and friction between the clamp and the output rod increase the output thrust. The structure adopted by the invention is simple, and the complicated clamping mechanism and pressing mechanism are avoided.

Description of drawings

Fig. 1 is the structural representation of the clamp type inertia piezoelectric linear motor of the present invention;

Fig. 2 is the structural representation of stator;

Figure 3 is a schematic diagram of the disassembly of the overall structure of the motor;

FIG. 4 is a schematic diagram of the movement of the motor within one cycle when the sawtooth wave signal is loaded.

Reference numerals are: stator fixing frame 1, output rod 2, left lever 3, right lever 4, upper clamp block 5, lower clamp block 6, wedge block 7, annular laminated piezoelectric ceramics 8, left straight beam 9 , Right straight beam 10.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the present invention is a clamp-type inertial piezoelectric linear motor, including a stator fixing frame 1 and an output rod 2 , the stator fixing frame 1 is a hollow structure, and the two ends of the stator fixing frame 1 are connected respectively. Left lever 3 and right lever 4, upper and lower clamp blocks 5 and 6 are arranged horizontally at the upper and lower ends of the left lever 3 and right lever 4, respectively, and a wedge is placed between the two lower clamp blocks 6. block 7;

The stator fixing frame 1 is provided with an annular laminated piezoelectric ceramic 8 , the upper end of the annular laminated piezoelectric ceramic 8 abuts on the inner surface of the upper end of the stator fixing frame 1 , and the annular laminated piezoelectric ceramic 8 has an inner surface. The lower end abuts the upper end of the wedge block 7 , the output rod 2 passes through the stator fixing frame 1 , the annular laminated piezoelectric ceramic 8 , and the wedge block 7 in sequence downward, and the lower end of the output rod 2 protrudes from the wedge block 7 .

As shown in Figure 2, the end faces of the two upper clamp blocks 5 that are close to each other are vertical planes and inclined planes from top to bottom, and the two inclined planes form a figure-eight shape, and the distance between the two upper clamp blocks 5 is greater than the output rod. 2; the distance between the two upper clamping blocks 5 is less than the distance between the two lower clamping blocks 6; The shapes are the same; the end faces of the two lower clamp blocks 6 close to each other are in an inverted figure shape; the left lever 3 and the right lever 4 are flexibly hinged to the stator fixing frame 1 through the left straight beam 9 and the right straight beam 10 respectively.

As shown in FIGS. 2 and 3 , the upper end of the stator fixing frame 1 is provided with an upper through hole, the lower end is provided with a lower through hole, the annular laminated piezoelectric ceramic 8 is provided with a first through hole, and the wedge block 7 is provided with a first through hole. Two through holes, the circle centers of the upper through hole, the lower through hole, the first through hole and the second through hole are all on the same vertical line, the upper through hole is smaller than the lower through hole, the upper through hole, the first through hole and the second through hole are all on the same vertical line. The size of the first through hole and the second through hole are the same, the output rod 2 passes through the first through hole and the second through hole in sequence from the upper through hole downward, and the annular laminated piezoelectric ceramic 8 passes through the lower through hole against the wedge 7.

The working mode of the motor structure of the present invention is as follows:

As shown in Figure 4, after the sawtooth wave electrical signal with slow rise and fast fall is input into the annular laminated piezoelectric ceramic 8, the motion process experienced by the motor in one cycle:

Point O is the initial state, and each component is in a relaxed state;

From O to A, the voltage signal rises slowly, the annular laminated piezoelectric ceramics 8 slowly stretches, pushes the wedge block 7 to move downward, and opens the left and right lower clamp blocks 6 through the left and right wedge surfaces, and through the left and right wedge surfaces The flexible hinge and the right flexible hinge make the left and right upper clamp blocks 5 cooperate to clamp the output rod 2 and make it move down in the axial direction for a distance δ;

From A to B, the voltage signal drops rapidly, the annular laminated piezoelectric ceramic 8 quickly retracts to its original length, the wedge 7 moves up to its original position, the left and right levers return to their original states, respectively, and the two upper clamps on the left and right Block 5 releases the output rod 2 to restore the initial state;

By repeating the above process, the unidirectional movement of the output rod 2 with a large stroke can be realized.

By installing the above structure in reverse on the output rod 2, the reverse movement of the output rod can be realized.

The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions that belong to the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims (8)

1. A clamp-type inertial piezoelectric linear motor is characterized in that: comprising a stator fixing frame (1) and an output rod (2), the stator fixing frame (1) is a hollow structure, and the stator fixing frame (1) ) are respectively connected to the left lever (3) and the right lever (4) at both ends, and the upper and lower ends of the left lever (3) and the right lever (4) are respectively provided with an upper clamp block (5) and a lower clamp block ( 6), a wedge block (7) is placed between the two lower clamping blocks (6); The stator fixing frame (1) is provided with an annular laminated piezoelectric ceramic (8), the upper end of the annular laminated piezoelectric ceramic (8) abuts against the inner surface of the upper end of the stator fixing frame (1), and the The lower end of the annular laminated piezoelectric ceramic (8) abuts against the upper end of the wedge block (7), and the output rod (2) passes through the stator fixing frame (1), the annular laminated piezoelectric ceramic (8), Wedge block (7), the lower end of the output rod (2) protrudes from the wedge block (7). 2. A clamp-type inertial piezoelectric linear motor according to claim 1, wherein the end faces of the two upper clamp blocks (5) that are close to each other are a vertical plane and an inclined plane from top to bottom. , the two inclined surfaces form a figure-eight shape, and the distance between the two clamping blocks (5) is greater than the cross-sectional diameter of the output rod (2). 3. A clamp-type inertial piezoelectric linear motor according to claim 2, wherein the distance between the two upper clamp blocks (5) is smaller than the distance between the two lower clamp blocks (6). distance between. 4. A clamp-type inertial piezoelectric linear motor according to claim 3, characterized in that: the shape of the two wedge surfaces of the wedge block (7) is in contact with the end surface of the lower clamp block (6) correspondingly in contact with it. The shape is the same. 5 . The clamp-type inertial piezoelectric linear motor according to claim 4 , wherein the end faces of the two lower clamp blocks ( 6 ) that are close to each other are in an inverted figure-eight shape. 6 . 6. A clamp-type inertial piezoelectric linear motor according to claim 1, wherein the left lever (3) and the right lever (4) pass through the left straight beam (9) and the right straight beam ( 10) It is flexibly hinged with the stator fixing frame (1). 7. A clamp-type inertial piezoelectric linear motor according to claim 1, characterized in that: the upper end of the stator fixing frame (1) is provided with an upper through hole, the lower end is provided with a lower through hole, and the annular stack The layered piezoelectric ceramic (8) is provided with a first through hole, the wedge block (7) is provided with a second through hole, and the circle centers of the upper through hole, the lower through hole, the first through hole and the second through hole are all On the same vertical line, the upper through hole is smaller than the lower through hole, the size of the upper through hole, the first through hole and the second through hole are all the same, and the output rod (2) is in order from the upper through hole to the bottom Through the first through hole and the second through hole, the annular laminated piezoelectric ceramic (8) abuts on the wedge (7) through the lower through hole. 8. A clamp-type inertial piezoelectric linear motor according to claim 1, characterized in that: under the sawtooth wave electrical signal, the annular laminated piezoelectric ceramic (8) stretches and pushes the wedge block (8) downward. 7) Open the left two lower clamp blocks (6), so that the two upper clamp blocks (5) at the upper ends of the left lever (3) and the right lever (4) are close to each other to clamp the output rod (2), and along the Push the output rod (2) axially to make linear motion.

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