A piezoelectric transducer driven rotary feeding device and its working method

Abstract

The present invention discloses a piezoelectric transducer-driven rotary feeding device and its operating method. The device comprises a base, a feed tray, and n drive units. During operation, a simple harmonic excitation voltage signal of a preset frequency is simultaneously applied to the n piezoelectric transducers, exciting the first-order longitudinal vibration mode of the n piezoelectric transducers. The first-order longitudinal vibration of the piezoelectric transducers is amplified and transmitted to the feed tray via the first spring leaf of the drive unit in which it is located, causing the feed tray and the material therein to vibrate in the horizontal and vertical directions. When the material moves to the apex, the elastic potential energy of the first spring leaf in each drive unit reaches its maximum value, causing the feed tray to begin to move backward, and the material to fall in a parabolic curve due to inertia. During the periodic vibration process, the material rotates in the feed tray and is discharged from the material outlet of the feed tray. The present invention has a simple structure, is easy to process and assemble, has a large driving force, and has a good driving effect.

Description

Technical Field

[0001] The present invention relates to the fields of piezoelectric feeders, material conveying and micro-particle transportation, and in particular to a rotary feeder driven by a piezoelectric transducer and a working method thereof. Background Art

[0002] Vibratory material conveyors have important applications in modern industrial production, automated logistics, packaging and testing of micro-electronic components, and other production areas that require automated precision conveying. Vibratory material conveyors can form alignment, sorting, and directional conveying of materials.

[0003] Vibratory material conveyors can be categorized as electromagnetic and piezoelectric, depending on the source of vibration. Feeding devices using electromagnets as a driving force are widely used on production lines. However, these electromagnetic vibratory feeders suffer from high noise levels, low energy conversion rates, and are unsuitable for precision material handling. With the advancement of piezoelectric technology, new actuators using piezoelectric materials as a driving force are attracting increasing research interest.

[0004] Piezoelectric vibrating material conveying devices can be divided into linear piezoelectric vibrating material conveying devices and rotary piezoelectric vibrating material conveying devices according to the material conveying method. The linear piezoelectric vibrating feeder mainly consists of a base, a piezoelectric vibrator, a spring sheet, a top plate, etc. The working principle is that when the piezoelectric vibrator is excited by an alternating excitation signal, due to the inverse piezoelectric effect, the spring sheet produces reciprocating bending deformation under the excitation of the piezoelectric ceramic, inducing the top plate to produce elliptical motion, thereby conveying the material. The rotary piezoelectric vibrating material conveying device, based on the linear material conveying device, adopts the same working principle. The piezoelectric dual-chip is evenly distributed at the lower end of the circular top plate. The piezoelectric dual-chip drives the spring sheet to produce bending deformation, inducing the top plate to produce elliptical motion, thereby conveying the material. Because the above-mentioned piezoelectric vibrating feeders all use patch-type piezoelectric ceramic sheets for excitation, the amplitude of the above-mentioned piezoelectric vibrating feeders is small and the conveying effect is poor. Therefore, the linear vibratory material conveying devices currently on the market are based on the above-mentioned linear piezoelectric vibratory feeder with a mass block. The added inertia of the mass block increases the amplitude of the material tray, thereby improving the conveying efficiency. However, due to structural reasons, the rotary piezoelectric vibratory material conveying device cannot add a mass block. Therefore, the structure has not changed significantly, resulting in the disadvantages of small amplitude and limited application range. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a piezoelectric transducer driven rotary feeding device and a working method thereof in view of the defects involved in the background technology.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A piezoelectric transducer-driven rotary feeding device comprises a base, a feeding tray, and n driving units, where n is a natural number greater than or equal to 3;

[0008] The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one.

[0009] The driving unit includes a piezoelectric transducer, a connecting member, a first spring sheet and a second spring sheet;

[0010] The piezoelectric transducer comprises a front beam, a first piezoelectric unit, a clamping member, a second piezoelectric unit, a rear beam and a pre-tightening bolt;

[0011] The front beam comprises an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than that of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as that of the end face of the end portion and the other end face having the same shape as that of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion; a threaded blind hole is provided at the center of the end face of the root portion away from the enlarged portion, which cooperates with the pre-tightening bolt;

[0012] The rear beam is a cylinder with a cross section having the same shape as the end face of the front beam root, and a countersunk through hole matching the pre-tightening bolt is provided at the center of one end face of the rear beam;

[0013] The first piezoelectric unit and the second piezoelectric unit each comprise m annular piezoelectric ceramic sheets, where m is a natural number greater than or equal to 1; the m piezoelectric ceramic sheets are stacked in sequence and polarized along the thickness direction, with adjacent piezoelectric ceramic sheets having opposite polarization directions;

[0014] The clamping member comprises a clamping portion and a fixing portion, the clamping portion and the piezoelectric ceramic sheet have the same shape, and the fixing portion is connected to the side wall of the clamping portion via a flexible hinge;

[0015] The first pre-tightening bolt passes through the countersunk through hole of the rear beam in sequence through the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, and the second piezoelectric unit, and is then threadedly connected to the threaded blind hole of the front beam, thereby clamping the rear beam, the first piezoelectric unit, the clamping member, the second piezoelectric unit, and the front beam and making them coaxial; the polarization direction of the mth piezoelectric ceramic piece of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic piece of the second piezoelectric unit;

[0016] The fixing portion of the clamping member of the piezoelectric transducer is fixedly connected to the base so that the axis of the rear beam of the piezoelectric transducer is horizontal; the end of the front beam of the piezoelectric transducer is fixedly connected to the connecting member;

[0017] The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base;

[0018] One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located;

[0019] The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

[0020] As a further optimization solution of the rotary feeding device driven by a piezoelectric transducer of the present invention, a plurality of keys for clamping are provided circumferentially on the front beam of the piezoelectric transducer.

[0021] As a further optimization solution of the rotary feeding device driven by a piezoelectric transducer of the present invention, m is 2 and n is 4.

[0022] The present invention also discloses a working method of the rotary feeding device driven by the piezoelectric transducer, comprising the following steps:

[0023] A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional and vertical directions, and the material placed in the material tray to produce translational and vertical motion around the central axis of the disk; when the material moves to the top, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

[0024] The present invention also discloses another piezoelectric transducer driven rotary feeding device, comprising a base, a material tray, and n driving units, where n is a natural number greater than or equal to 3;

[0025] The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one.

[0026] The driving unit includes a piezoelectric transducer, a flexible hinge, a flexible hinge support, a connecting piece, a first spring leaf and a second spring leaf;

[0027] The piezoelectric transducer comprises a beam body and p piezoelectric ceramic sheets, where p is a natural number greater than or equal to 2; the p piezoelectric ceramic sheets are uniformly arranged on the side wall of the beam body in a circumferential direction, are polarized along their thickness direction, and the polarization directions are simultaneously inward or simultaneously outward;

[0028] The beam body includes an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than the area of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as the end face of the end portion and the other end face having the same shape as the end face of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion;

[0029] One end of the flexible hinge is fixedly connected to the lower end of the side wall of the beam body, and the other end is fixedly connected to the base through a flexible hinge support, so that the beam body is arranged horizontally;

[0030] The end of the piezoelectric transducer beam is fixedly connected to the connecting member;

[0031] The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base;

[0032] One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located;

[0033] The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

[0034] As a further optimization solution for the rotary feeding device driven by the piezoelectric transducer, n is 4 and p is 2.

[0035] The present invention also discloses a working method of the rotary feeding device driven by the piezoelectric transducer, comprising the following steps:

[0036] A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional direction and the vertical direction. The material placed in the material tray produces translational and vertical motion around the axis of the disk under the action of friction; when the material moves to the top point, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

[0037] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0038] 1. The device has a simple structure and is easy to design, process and assemble, which can effectively reduce the processing and assembly time of the device, thereby increasing production and reducing costs;

[0039] 2. By using the first-order longitudinal vibration mode of the piezoelectric transducer and the d33 effect of the piezoelectric ceramic, the amplitude is increased;

[0040] 3. By using replaceable spring sheets, the ratio of horizontal and vertical vibration of the tray can be easily changed, making it suitable for different materials and improving its application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the first structure of the present invention;

[0042] Figure 2 1 is a schematic structural diagram of a piezoelectric transducer in the first structure of the present invention;

[0043] Figure 3 1 is a schematic diagram of the working mode simulation of the present invention;

[0044] Figure 4 This is a schematic diagram of the second structure of the present invention;

[0045] Figure 5 It is a schematic structural diagram of the piezoelectric transducer in the second structure of the present invention.

[0046] In the figure, 1-base, 2-material tray, 3-piezoelectric transducer, 4-second spring sheet, 5-connecting block, 6-first spring sheet, 7-material outlet on the material tray, 8-rear beam, 9-first piezoelectric unit, 10-second piezoelectric unit, 11-clamping piece, 12-front beam. DETAILED DESCRIPTION

[0047] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0048] The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0049] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are merely used to distinguish elements, components, and / or parts from each other. Therefore, the first element, component, and / or part discussed below can become the second element, component, or part without departing from the teachings of the present invention.

[0050] like Figure 1 As shown, the present invention discloses a piezoelectric transducer driven rotary feeding device, comprising a base, a material tray, and n driving units, where n is a natural number greater than or equal to 3;

[0051] The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one.

[0052] The driving unit includes a piezoelectric transducer, a connecting member, a first spring sheet and a second spring sheet;

[0053] like Figure 2 As shown, the piezoelectric transducer comprises a front beam, a first piezoelectric unit, a clamping member, a second piezoelectric unit, a rear beam and a pre-tightening bolt;

[0054] The front beam comprises an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than that of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as that of the end face of the end portion and the other end face having the same shape as that of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion; a threaded blind hole is provided at the center of the end face of the root portion away from the enlarged portion, which cooperates with the pre-tightening bolt;

[0055] The rear beam is a cylinder with a cross section having the same shape as the end face of the front beam root, and a countersunk through hole matching the pre-tightening bolt is provided at the center of one end face of the rear beam;

[0056] The first piezoelectric unit and the second piezoelectric unit each comprise m annular piezoelectric ceramic sheets, where m is a natural number greater than or equal to 1; the m piezoelectric ceramic sheets are stacked in sequence and polarized along the thickness direction, with adjacent piezoelectric ceramic sheets having opposite polarization directions;

[0057] The clamping member comprises a clamping portion and a fixing portion, the clamping portion and the piezoelectric ceramic sheet have the same shape, and the fixing portion is connected to the side wall of the clamping portion via a flexible hinge;

[0058] The first pre-tightening bolt passes through the countersunk through hole of the rear beam in sequence through the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, and the second piezoelectric unit, and is then threadedly connected to the threaded blind hole of the front beam, thereby clamping the rear beam, the first piezoelectric unit, the clamping member, the second piezoelectric unit, and the front beam and making them coaxial; the polarization direction of the mth piezoelectric ceramic piece of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic piece of the second piezoelectric unit;

[0059] The fixing portion of the clamping member of the piezoelectric transducer is fixedly connected to the base so that the axis of the rear beam of the piezoelectric transducer is horizontal; the end of the front beam of the piezoelectric transducer is fixedly connected to the connecting member;

[0060] The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base;

[0061] One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located;

[0062] The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

[0063] As a further optimization solution of the rotary feeding device driven by a piezoelectric transducer of the present invention, a plurality of keys for clamping are provided circumferentially on the front beam of the piezoelectric transducer.

[0064] As a further optimization solution of the rotary feeding device driven by a piezoelectric transducer of the present invention, m is 2 and n is 4.

[0065] like Figure 3 As shown, the present invention also discloses a working method of the rotary feeding device driven by the piezoelectric transducer, comprising the following steps:

[0066] A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional and vertical directions, and the material placed in the material tray to produce translational and vertical motion around the central axis of the disk; when the material moves to the top, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

[0067] like Figure 4 As shown, the present invention also discloses another piezoelectric transducer driven rotary feeding device, comprising a base, a material tray, and n driving units, where n is a natural number greater than or equal to 3;

[0068] The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one.

[0069] The driving unit includes a piezoelectric transducer, a flexible hinge, a flexible hinge support, a connecting piece, a first spring leaf and a second spring leaf;

[0070] like Figure 5 As shown, the piezoelectric transducer includes a beam body and p piezoelectric ceramic sheets, where p is a natural number greater than or equal to 2; the p piezoelectric ceramic sheets are uniformly arranged on the side wall of the beam body in a circumferential direction, and are polarized along their thickness direction, and the polarization directions are simultaneously inward or simultaneously outward;

[0071] The beam body includes an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than the area of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as the end face of the end portion and the other end face having the same shape as the end face of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion;

[0072] One end of the flexible hinge is fixedly connected to the lower end of the side wall of the beam body, and the other end is fixedly connected to the base through a flexible hinge support, so that the beam body is arranged horizontally;

[0073] The end of the piezoelectric transducer beam is fixedly connected to the connecting member;

[0074] The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base;

[0075] One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located;

[0076] The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

[0077] As a further optimization solution for the rotary feeding device driven by the piezoelectric transducer, n is 4 and p is 2.

[0078] The present invention also discloses a working method of the rotary feeding device driven by the piezoelectric transducer, comprising the following steps:

[0079] A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional direction and the vertical direction. The material placed in the material tray produces translational and vertical motion around the axis of the disk under the action of friction; when the material moves to the top point, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

[0080] 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 those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0081] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A piezoelectric transducer driven rotary feeding device, characterized in that: It includes a base, a material tray, and n drive units, where n is a natural number greater than or equal to 3; The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one. The driving unit includes a piezoelectric transducer, a connecting member, a first spring sheet and a second spring sheet; The piezoelectric transducer comprises a front beam, a first piezoelectric unit, a clamping member, a second piezoelectric unit, a rear beam and a pre-tightening bolt; The front beam comprises an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than that of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as that of the end face of the end portion and the other end face having the same shape as that of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion; a threaded blind hole is provided at the center of the end face of the root portion away from the enlarged portion, which cooperates with the pre-tightening bolt; The rear beam is a cylinder with a cross section having the same shape as the end face of the front beam root, and a countersunk through hole matching the pre-tightening bolt is provided at the center of one end face of the rear beam; The first piezoelectric unit and the second piezoelectric unit each comprise m annular piezoelectric ceramic sheets, where m is a natural number greater than or equal to 1; the m piezoelectric ceramic sheets are stacked in sequence and polarized along the thickness direction, with adjacent piezoelectric ceramic sheets having opposite polarization directions; The clamping member comprises a clamping portion and a fixing portion, the clamping portion and the piezoelectric ceramic sheet have the same shape, and the fixing portion is connected to the side wall of the clamping portion via a flexible hinge; The pre-tightening bolt passes through the countersunk through hole of the rear beam in sequence through the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, and the second piezoelectric unit, and is then threadedly connected to the threaded blind hole of the front beam, thereby clamping the rear beam, the first piezoelectric unit, the clamping member, the second piezoelectric unit, and the front beam and making them coaxial; the polarization direction of the mth piezoelectric ceramic piece of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic piece of the second piezoelectric unit; The fixing portion of the clamping member of the piezoelectric transducer is fixedly connected to the base so that the axis of the rear beam of the piezoelectric transducer is horizontal; the end of the front beam of the piezoelectric transducer is fixedly connected to the connecting member; The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base; One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located; The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

2. The piezoelectric transducer driven rotary feeding device according to claim 1, characterized in that: A plurality of keys for clamping are circumferentially provided on the front beam of the piezoelectric transducer.

3. The piezoelectric transducer driven rotary feeding device according to claim 1, characterized in that: The m is 2 and the n is 4.

4. The operating method of the piezoelectric transducer driven rotary feeding device according to claim 1, characterized in that: The following steps are involved: A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional and vertical directions, and the material placed in the material tray to produce translational and vertical motion around the central axis of the disk; when the material moves to the top, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

5. A piezoelectric transducer driven rotary feeding device, characterized in that: It includes a base, a material tray, and n drive units, where n is a natural number greater than or equal to 3; The material tray is in the shape of a disk, and a material outlet is provided on its side wall. The lower bottom surface is evenly provided with n fixing seats corresponding to the driving units one by one. The driving unit includes a piezoelectric transducer, a flexible hinge, a flexible hinge support, a connecting piece, a first spring leaf and a second spring leaf; The piezoelectric transducer comprises a beam body and p piezoelectric ceramic sheets, where p is a natural number greater than or equal to 2; the p piezoelectric ceramic sheets are uniformly arranged on the side wall of the beam body in a circumferential direction, are polarized along their thickness direction, and the polarization directions are simultaneously inward or simultaneously outward; The beam body includes an end portion, an enlarged portion, and a root portion, wherein the end portion and the root portion are both cylindrical, and the area of the end face of the end portion is smaller than the area of the end face of the root portion; the enlarged portion is a truncated cone with one end face having the same shape as the end face of the end portion and the other end face having the same shape as the end face of the root portion, and the end of the enlarged portion with a smaller area is coaxially fixedly connected to one end of the end portion, and the end of the enlarged portion with a larger area is coaxially fixedly connected to one end of the root portion; One end of the flexible hinge is fixedly connected to the lower end of the side wall of the beam body, and the other end is fixedly connected to the base through a flexible hinge support, so that the beam body is arranged horizontally; The end of the piezoelectric transducer beam is fixedly connected to the connecting member; The second spring piece is perpendicular to the axis of the piezoelectric transducer rear beam, one end of the second spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to the base; One end of the first spring piece is fixedly connected to the connecting member, and the other end is fixedly connected to a fixing seat corresponding to the driving unit in which it is located; The included angles between the first spring pieces of the n driving units and the horizontal plane are equal and not equal to 90°, and the included angles between the first spring pieces of adjacent driving units are equal.

6. The piezoelectric transducer driven rotary feeding device according to claim 5, characterized in that: The n is 4 and the p is 2.

7. The operating method of the piezoelectric transducer driven rotary feeding device according to claim 5, characterized in that: The following steps are involved: A simple harmonic excitation voltage signal of a preset frequency is applied to n piezoelectric transducers simultaneously, thereby exciting the first-order longitudinal vibration mode of the n piezoelectric transducers; the first-order longitudinal vibration of the piezoelectric transducer is amplified and transmitted to the material tray through the first spring piece of the drive unit in which it is located, causing the material tray to vibrate in the torsional direction and the vertical direction. The material placed in the material tray produces translational and vertical motion around the axis of the disk under the action of friction; when the material moves to the top point, the elastic potential energy of the first spring piece in each drive unit reaches the maximum value, the material tray starts to move back, and the material falls in a parabola due to inertia; during the periodic vibration process, the material rotates in the material tray and is discharged from the material outlet of the material tray.

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