CN115947045A - Vertically-arranged longitudinal-bending composite rotary feeding device and working method thereof - Google Patents
Vertically-arranged longitudinal-bending composite rotary feeding device and working method thereof Download PDFInfo
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Abstract
The invention discloses a vertically-arranged longitudinal-bending composite rotary feeding device and a working method thereof. When the piezoelectric material tray is in work, simple harmonic excitation signals with specified frequency are applied to the piezoelectric ceramic pieces arranged in the diagonal directions on the n piezoelectric vibrators, the buckling composite modes of the n piezoelectric vibrators are excited, and the material tray is driven to reciprocate in the vertical and torsional directions; the material in the tray thus moves horizontally and vertically. When the material reaches the top point, the material tray moves back, and the material continues to horizontally move and fall in a parabola shape due to inertia; when the materials fall into the material tray, the material tray starts to vibrate in the next period. The material is rotationally conveyed by the periodic motion; in addition, an excitation signal is applied to the piezoelectric ceramic piece at the other diagonal position on the n piezoelectric vibrators, so that reverse transportation of materials can be realized. The invention has simple structure and easy assembly, and can realize bidirectional rotary transportation.
Description
Technical Field
The invention relates to the field of piezoelectric feeders, material conveying and microparticle transportation, in particular to a vertically-arranged longitudinal-bending composite rotary feeding device and a working method thereof.
Background
The piezoelectric vibration material conveying device utilizes the inverse piezoelectric effect of a piezoelectric material to generate vibration, is used as a driving source to drive the trough to realize the conveying of materials, has the advantages of simple structure, no need of a transmission mechanism, no electromagnetic interference and the like, and is widely applied to automatic processing, automatic packaging and automatic assembly systems.
The piezoelectric vibration material conveying device can be divided into a linear type and a rotary type piezoelectric vibration feeding device according to the transportation form of materials. Japanese technologists developed a linear piezoelectric vibration feeder using a piezoelectric ceramic plate as a driving source for the first time. The linear piezoelectric vibration feeder developed by japanese researchers mainly consists of a base, a piezoelectric vibrator, a spring piece, a top plate and the like. The working principle is that when the piezoelectric vibrator is excited by an alternating excitation signal, the spring piece generates reciprocating bending deformation under the excitation of the piezoelectric ceramic due to the inverse piezoelectric effect, and the top plate is induced to generate elliptic motion, so that materials are conveyed. The piezoelectric type vibration feeder has the advantages of simple structure, small volume, light weight, low noise and low energy consumption, but still has the defects of fixed structural form, incapability of realizing bidirectional movement and high processing and assembling requirements.
The rotary piezoelectric vibration feeding device is developed on the basis of a linear piezoelectric vibration feeding device, and the working principle is similar to that of a linear type. Through the multiple groups of spring pieces and the piezoelectric vibrators which are obliquely arranged, when the piezoelectric vibrators are subjected to alternating excitation voltage, due to the inverse piezoelectric effect, the reciprocating bending deformation of the piezoelectric vibrators and the spring pieces is excited, so that the material tray is driven to generate vertical and torsional vibration, and materials are conveyed. But the structure has the defects of fixed structure, difficult processing and assembly and incapability of realizing bidirectional transportation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a vertically-arranged longitudinal-bending composite rotary feeding device and a working method thereof aiming at the defects related to the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a vertically-arranged longitudinal-bending composite rotary feeding device comprises a base, a material tray and n piezoelectric vibrators, wherein n is a natural number greater than or equal to 3;
the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixed seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
the base is provided with n second fixing seats which correspond to the first fixing seats one by one;
the piezoelectric vibrator comprises a metal substrate and first to fourth piezoelectric ceramic pieces;
the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet, the third piezoelectric ceramic sheet and the fourth piezoelectric ceramic sheet are identical in shape and are rectangular; one side of the metal substrate is provided with a first groove and a second groove which are respectively used for arranging a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, and the other side of the metal substrate is provided with a third groove and a fourth groove which are respectively used for arranging a third piezoelectric ceramic piece and a fourth piezoelectric ceramic piece; the first groove and the third groove are symmetrical, and the second groove and the fourth groove are symmetrical;
the first to fourth piezoelectric ceramic pieces are correspondingly arranged in the first to fourth grooves one by one, and are polarized along the thickness direction, and the polarization directions are outward or inward;
the upper end of the metal substrate is fixedly connected with a first fixing seat corresponding to the piezoelectric vibrator, and the lower end of the metal substrate is fixedly connected with a second fixing seat corresponding to the piezoelectric vibrator, so that the metal substrate is perpendicular to the material tray, and the material tray is horizontally placed.
As a further optimized scheme of the vertically-arranged longitudinal-bending composite rotary feeding device, the first to fourth piezoelectric ceramic pieces are correspondingly adhered to the first to fourth grooves one by one through epoxy resin glue.
As a further optimization scheme of the vertically-arranged longitudinal-bending composite type rotary feeding device, n is 4.
The invention also discloses a working method of the vertically-arranged longitudinal-bending composite type rotary feeding device, which comprises the following steps:
meanwhile, simple harmonic excitation signals with preset frequency are applied to the first piezoelectric ceramic piece and the fourth piezoelectric ceramic piece of the n piezoelectric vibrators, and the buckling composite mode of the n piezoelectric vibrators is excited to drive the material tray to reciprocate in the vertical direction and the torsion direction; the material in the material tray generates horizontal displacement rotating around the central shaft of the material tray and displacement along the vertical direction of the central shaft of the material tray; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, simple harmonic excitation signals with preset frequencies are applied to the second piezoelectric ceramic pieces and the third piezoelectric ceramic pieces of the n piezoelectric vibrators at the same time.
The invention also discloses another vertically-arranged longitudinal-bending composite rotary feeding device, which comprises a base, a material tray and n piezoelectric vibrators, wherein n is a natural number more than or equal to 3;
the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixed seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
the base is provided with n second fixing seats which correspond to the first fixing seats one by one;
the piezoelectric vibrator comprises a pretightening bolt, a first beam body, a second beam body, a third beam body, a fourth beam body and a first piezoelectric driving unit, a second piezoelectric driving unit and a third piezoelectric driving unit;
the first beam body, the second beam body, the third beam body and the fourth beam body are cylinders with the same cross section shape, wherein a countersunk through hole matched with the pre-tightening bolt is formed in the center of the lower end face of the fourth beam body;
the first piezoelectric driving unit and the third piezoelectric driving unit respectively comprise 2m double-partition piezoelectric ceramic plates with the same cross section shape as the first beam body, and m is a natural number more than or equal to 1; the center of the double-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, the through hole is polarized along the thickness direction of the through hole, and the polarization directions of the two partitions are opposite; the 2m double-partition piezoelectric ceramic pieces are sequentially stacked, the boundary lines are coplanar, and the polarization directions of the adjacent double-partition piezoelectric ceramic pieces are opposite;
the second piezoelectric driving unit comprises 2m single-partition piezoelectric ceramic plates with the same cross section shape as the first beam body; the center of the single-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, and the through hole is polarized along the thickness direction of the through hole; the 2m single-partition piezoelectric ceramic pieces are sequentially stacked, and the polarization directions of the adjacent single-partition piezoelectric ceramic pieces are opposite;
the polarization direction of the first piezoelectric ceramic piece in the first piezoelectric driving unit is opposite to that of the first piezoelectric ceramic piece in the third piezoelectric driving unit;
the pre-tightening bolt sequentially penetrates through the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body and the first piezoelectric driving unit and then is in threaded connection with the pre-tightening threaded blind hole of the first beam body, and the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body, the first piezoelectric driving unit and the first beam body are clamped and coaxial;
the upper end of the first beam body is fixedly connected with a first fixing seat corresponding to the driving unit where the first beam body is located, and the lower end of the fourth beam body is fixedly connected with a second fixing seat corresponding to the driving unit where the fourth beam body is located, so that the piezoelectric vibrator and the material tray are vertically placed and the material tray is horizontally placed.
As a further optimization scheme of the vertically-arranged longitudinal-bending composite type rotary feeding device, n is 4.
The invention also discloses a working method of the vertically-arranged longitudinal-bending composite type rotary feeding device, which comprises the following steps:
a preset simple harmonic excitation signal U1 is applied to a second piezoelectric unit of the n piezoelectric vibrators, a preset simple harmonic excitation signal U2 is applied to a first piezoelectric unit and a third piezoelectric unit of the n piezoelectric vibrators, the voltage and the frequency of the U1 and the U2 are the same, and the phase difference is pi/2; at the moment, each piezoelectric vibrator is excited to generate a coupling vibration mode of first-order longitudinal vibration and second-order bending vibration; the coupling vibration modes of the n piezoelectric vibrators drive the material tray to reciprocate in the vertical and torsional directions, and materials placed in the material tray generate horizontal displacement rotating around the central axis of the material tray and displacement in the vertical direction along the central axis of the material tray under the composite vibration of the material tray; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, the phase difference between U1 and U2 is adjusted to-pi/2.
Compared with the prior art, the technical scheme adopted by the invention has the following technical effects:
1. the piezoelectric vibrator which is vertically arranged is adopted for driving, a spring piece structure is cancelled, and the piezoelectric vibrator has the advantages of simple structure and easiness in processing and assembling;
2. the first-order longitudinal vibration and the second-order bending vibration of the piezoelectric vibrator are driven by a coupling mode, oblique elliptical motion is obtained by exciting piezoelectric ceramic pieces which are arranged in diagonal lines, and therefore vertical and torsional vibration of the discharge disc is induced;
3. the piezoelectric ceramic plates arranged on different diagonals are excited to generate inclined elliptical motion tracks with different inclination angles, so that the bidirectional motion of the material is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the tray of the present invention;
FIG. 3 is a schematic view of the structure of the base of the present invention;
fig. 4 is a schematic structural view of a piezoelectric vibrator in the present invention;
FIG. 5 is a schematic diagram of the simulation of the first-order longitudinal vibration and the second-order bending vibration coupled modes of the piezoelectric vibrator according to the present invention;
FIG. 6 is a schematic view of the working principle of the tray in the present invention;
FIG. 7 is another schematic structural view of the present invention;
fig. 8 is a schematic diagram illustrating the driving of a piezoelectric vibrator according to another structure of the present invention.
In the figure, 1-base, 2-piezoelectric vibrator, 3-material tray, 4-first fixed seat, 5-second fixed seat, 6-metal substrate, 7-first piezoelectric ceramic piece, 8-second piezoelectric ceramic piece, 9-third piezoelectric ceramic piece and 10-fourth piezoelectric ceramic piece.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, and/or section from another. Thus, a first element, component, and/or section discussed below could be termed a second element, component, or section without departing from the teachings of the present invention.
As shown in fig. 1, the invention discloses a vertically-arranged longitudinal-bending composite rotary feeding device, which comprises a base, a material tray and n piezoelectric vibrators, wherein n is a natural number more than or equal to 3;
as shown in fig. 2, the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixing seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
as shown in fig. 3, n second fixing seats corresponding to the first fixing seats one to one are arranged on the base;
as shown in fig. 4, the piezoelectric vibrator includes a metal substrate, and first to fourth piezoelectric ceramic sheets;
the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet, the third piezoelectric ceramic sheet and the fourth piezoelectric ceramic sheet are identical in shape and are rectangular; one side of the metal substrate is provided with a first groove and a second groove which are respectively used for arranging a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, and the other side of the metal substrate is provided with a third groove and a fourth groove which are respectively used for arranging a third piezoelectric ceramic piece and a fourth piezoelectric ceramic piece; the first groove and the third groove are symmetrical, and the second groove and the fourth groove are symmetrical;
the first piezoelectric ceramic pieces, the second piezoelectric ceramic pieces, the third piezoelectric ceramic pieces, the fourth piezoelectric ceramic pieces and the fourth piezoelectric ceramic pieces are arranged in the first grooves, the second grooves and the fourth grooves in a one-to-one correspondence mode, the first grooves, the second grooves and the fourth grooves are all polarized along the thickness direction, and the polarization directions are all towards the outside or towards the inside;
the upper end of the metal substrate is fixedly connected with a first fixing seat corresponding to the piezoelectric vibrator where the metal substrate is located, and the lower end of the metal substrate is fixedly connected with a second fixing seat corresponding to the piezoelectric vibrator where the metal substrate is located, so that the metal substrate and the material tray are perpendicular and the material tray is horizontally placed.
The first to fourth piezoelectric ceramic pieces are correspondingly pasted in the first to fourth grooves one by one through epoxy resin glue, and n is preferably 4.
The invention also discloses a working method of the vertically-arranged longitudinal-bending composite type rotary feeding device, which comprises the following steps:
meanwhile, simple harmonic excitation signals with preset frequency are applied to the first piezoelectric ceramic piece and the fourth piezoelectric ceramic piece of the n piezoelectric vibrators, and longitudinal bending composite modes of the n piezoelectric vibrators are excited, as shown in fig. 5, so that a material tray is driven to reciprocate in the vertical direction and the torsional direction; the material in the material tray generates horizontal displacement rotating around the central shaft of the material tray and displacement along the vertical direction of the central shaft of the material tray, as shown in figure 6; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, simple harmonic excitation signals with preset frequency are applied to the second piezoelectric ceramic pieces and the third piezoelectric ceramic pieces of the n piezoelectric vibrators at the same time.
As shown in fig. 7, the invention also discloses another vertical arrangement type longitudinal bending composite rotary feeding device, which comprises a base, a material tray and n piezoelectric vibrators, wherein n is a natural number more than or equal to 3;
the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixed seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
the base is provided with n second fixing seats which correspond to the first fixing seats one by one;
the piezoelectric vibrator comprises a pretightening bolt, a first beam body, a second beam body, a third beam body, a fourth beam body and a first piezoelectric driving unit, a second piezoelectric driving unit and a third piezoelectric driving unit;
the first beam body, the second beam body, the third beam body and the fourth beam body are cylinders with the same cross section shape, wherein a countersunk through hole matched with the pre-tightening bolt is formed in the center of the lower end face of the fourth beam body;
the first piezoelectric driving unit and the third piezoelectric driving unit respectively comprise 2m double-partition piezoelectric ceramic plates with the same cross section shape as the first beam body, and m is a natural number more than or equal to 1; the center of the double-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, the through hole is polarized along the thickness direction of the through hole, and the polarization directions of the two partitions are opposite; the 2m double-partition piezoelectric ceramic pieces are sequentially stacked, the boundary lines are coplanar, and the polarization directions of the adjacent double-partition piezoelectric ceramic pieces are opposite;
the second piezoelectric driving unit comprises 2m single-partition piezoelectric ceramic plates with the same cross section shape as the first beam body; the center of the single-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, and the through hole is polarized along the thickness direction of the through hole; the 2m single-partition piezoelectric ceramic pieces are sequentially stacked, and the polarization directions of the adjacent single-partition piezoelectric ceramic pieces are opposite;
the polarization direction of the first piezoelectric ceramic piece in the first piezoelectric driving unit is opposite to that of the first piezoelectric ceramic piece in the third piezoelectric driving unit;
the pre-tightening bolt sequentially penetrates through the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body and the first piezoelectric driving unit and then is in threaded connection with the pre-tightening threaded blind hole of the first beam body, and the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body, the first piezoelectric driving unit and the first beam body are clamped and coaxial;
the upper end of the first beam body is fixedly connected with a first fixing seat corresponding to the driving unit where the first beam body is located, and the lower end of the fourth beam body is fixedly connected with a second fixing seat corresponding to the driving unit where the fourth beam body is located, so that the piezoelectric vibrator and the material tray are vertically placed and the material tray is horizontally placed.
As a further optimization scheme of the vertically-arranged longitudinal-bending composite type rotary feeding device, n is 4.
The invention also discloses a working method of the vertically-arranged longitudinal-bending composite type rotary feeding device, which comprises the following steps:
as shown in fig. 8, a preset simple harmonic excitation signal U1 is applied to the second piezoelectric unit of the n piezoelectric vibrators, a preset simple harmonic excitation signal U2 is applied to the first and third piezoelectric units of the n piezoelectric vibrators, and the U1 and U2 have the same voltage and frequency and have a phase difference of pi/2; at the moment, each piezoelectric vibrator is excited to generate a coupling vibration mode of first-order longitudinal vibration and second-order bending vibration; the coupling vibration modes of the n piezoelectric vibrators drive the material tray to reciprocate in the vertical and torsional directions, and materials placed in the material tray generate horizontal displacement rotating around the central axis of the material tray and displacement in the vertical direction along the central axis of the material tray under the composite vibration of the material tray; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, the phase difference between U1 and U2 is adjusted to-pi/2.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A vertical arrangement type longitudinal bending composite rotary feeding device is characterized by comprising a base, a material tray and n piezoelectric vibrators, wherein n is a natural number more than or equal to 3;
the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixed seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
the base is provided with n second fixing seats which correspond to the first fixing seats one by one;
the piezoelectric vibrator comprises a metal substrate and first to fourth piezoelectric ceramic pieces;
the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet, the third piezoelectric ceramic sheet and the fourth piezoelectric ceramic sheet are identical in shape and are rectangular; one side of the metal substrate is provided with a first groove and a second groove which are respectively used for arranging a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, and the other side of the metal substrate is provided with a third groove and a fourth groove which are respectively used for arranging a third piezoelectric ceramic piece and a fourth piezoelectric ceramic piece; the first groove and the third groove are symmetrical, and the second groove and the fourth groove are symmetrical;
the first to fourth piezoelectric ceramic pieces are correspondingly arranged in the first to fourth grooves one by one, and are polarized along the thickness direction, and the polarization directions are outward or inward;
the upper end of the metal substrate is fixedly connected with a first fixing seat corresponding to the piezoelectric vibrator where the metal substrate is located, and the lower end of the metal substrate is fixedly connected with a second fixing seat corresponding to the piezoelectric vibrator where the metal substrate is located, so that the metal substrate and the material tray are perpendicular and the material tray is horizontally placed.
2. The vertically-arranged buckling composite type rotary feeding device according to claim 1, wherein the first to fourth piezoelectric ceramic plates are pasted in the first to fourth grooves in a one-to-one correspondence manner by epoxy resin glue.
3. The vertically-arranged buckling composite type rotary feeding device according to claim 1, wherein n is 4.
4. The working method of the vertically-arranged buckling compound type rotary feeding device according to claim 1, characterized by comprising the steps of:
meanwhile, simple harmonic excitation signals with preset frequency are applied to the first piezoelectric ceramic piece and the fourth piezoelectric ceramic piece of the n piezoelectric vibrators, and the buckling composite mode of the n piezoelectric vibrators is excited to drive the material tray to reciprocate in the vertical direction and the torsion direction; the material in the material tray generates horizontal displacement rotating around the central shaft of the material tray and displacement along the vertical direction of the central shaft of the material tray; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, simple harmonic excitation signals with preset frequency are applied to the second piezoelectric ceramic pieces and the third piezoelectric ceramic pieces of the n piezoelectric vibrators at the same time.
5. A vertical arrangement type longitudinal bending composite rotary feeding device is characterized by comprising a base, a material tray and n piezoelectric vibrators, wherein n is a natural number more than or equal to 3;
the material tray is disc-shaped, the side wall of the material tray is provided with a material outlet, and the lower bottom surface is uniformly provided with n first fixed seats which correspond to the piezoelectric vibrators one by one in the circumferential direction;
n second fixing seats which correspond to the first fixing seats one by one are arranged on the base;
the piezoelectric vibrator comprises a pretightening bolt, a first beam body, a second beam body, a third beam body, a fourth beam body and a first piezoelectric driving unit, a second piezoelectric driving unit and a third piezoelectric driving unit;
the first beam body, the second beam body, the third beam body and the fourth beam body are cylinders with the same cross section shape, wherein a countersunk through hole matched with the pre-tightening bolt is formed in the center of the lower end face of the fourth beam body;
the first piezoelectric driving unit and the third piezoelectric driving unit respectively comprise 2m double-partition piezoelectric ceramic plates with the same cross section shape as the first beam body, and m is a natural number more than or equal to 1; the center of the double-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, the through hole is polarized along the thickness direction of the through hole, and the polarization directions of the two partitions are opposite; the 2m double-partition piezoelectric ceramic pieces are sequentially stacked, the boundaries are coplanar, and the polarization directions of the adjacent double-partition piezoelectric ceramic pieces are opposite;
the second piezoelectric driving unit comprises 2m single-partition piezoelectric ceramic plates with the same cross section shape as the first beam body; the center of the single-partition piezoelectric ceramic piece is provided with a through hole matched with the pre-tightening bolt, and the through hole is polarized along the thickness direction of the through hole; the 2m single-partition piezoelectric ceramic pieces are sequentially stacked, and the polarization directions of the adjacent single-partition piezoelectric ceramic pieces are opposite;
the polarization direction of the first piezoelectric ceramic piece in the first piezoelectric driving unit is opposite to that of the first piezoelectric ceramic piece in the third piezoelectric driving unit;
the pre-tightening bolt sequentially penetrates through the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body and the first piezoelectric driving unit and then is in threaded connection with the pre-tightening threaded blind hole of the first beam body, and the fourth beam body, the third piezoelectric driving unit, the third beam body, the second piezoelectric driving unit, the second beam body, the first piezoelectric driving unit and the first beam body are clamped and coaxial;
the upper end of the first beam body is fixedly connected with a first fixing seat corresponding to the driving unit where the first beam body is located, and the lower end of the fourth beam body is fixedly connected with a second fixing seat corresponding to the driving unit where the fourth beam body is located, so that the piezoelectric vibrator and the material tray are vertically placed and the material tray is horizontally placed.
6. The vertically-arranged buckling-bending composite type rotary feeding device according to claim 5, wherein n is 4.
7. The working method of the vertically-arranged buckling compound type rotary feeding device according to claim 5, characterized by comprising the steps of:
a preset simple harmonic excitation signal U1 is applied to a second piezoelectric unit of the n piezoelectric vibrators, a preset simple harmonic excitation signal U2 is applied to a first piezoelectric unit and a third piezoelectric unit of the n piezoelectric vibrators, and the voltages and the frequencies of the U1 and the U2 are the same and the phase difference is pi/2; at the moment, each piezoelectric vibrator is excited to generate a coupling vibration mode of first-order longitudinal vibration and second-order bending vibration; the coupling vibration modes of the n piezoelectric vibrators drive the material tray to reciprocate in the vertical and torsional directions, and materials placed in the material tray generate horizontal displacement rotating around the central axis of the material tray and displacement in the vertical direction along the central axis of the material tray under the composite vibration of the material tray; when the material reaches the top point, the material tray moves back, and the material continues to move horizontally and falls due to inertia in a parabola shape; in the periodic vibration process, the material rotates in the material tray and is output from a material outlet of the material tray;
if the materials need to be transported reversely, the phase difference between U1 and U2 is adjusted to-pi/2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211514735.7A CN115947045A (en) | 2022-11-30 | 2022-11-30 | Vertically-arranged longitudinal-bending composite rotary feeding device and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211514735.7A CN115947045A (en) | 2022-11-30 | 2022-11-30 | Vertically-arranged longitudinal-bending composite rotary feeding device and working method thereof |
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