A piezoelectrically-driven longitudinal-bending composite linear feeding device and its working method

Abstract

The present invention discloses a longitudinal-bending composite linear feeding device driven by piezoelectricity and its working method. The feeding device includes a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts. During operation, by exciting the first piezoelectric vibrator and the second piezoelectric vibrator, the excitation of the top plate generates a composite motion in the vertical and horizontal directions; the material placed in the top plate moves obliquely forward under the composite vibration. When the material reaches the apex, the top plate moves back. At this time, the material continues to move forward in a parabola and falls due to inertia; when the material falls onto the top plate, the top plate starts the next cycle of composite vibration, and under this cyclic motion, the transportation of the material on the top plate can be realized. The structure of the present invention is simple, easy to process and assemble, and can transport in both directions.

Description

Technical Field

[0001] The present invention relates to the fields of piezoelectric feeders, material transportation, and microparticle transportation, and particularly to a longitudinally and transversely combined linear feeding device driven by piezoelectricity and its working method. Background Art

[0002] A vibrating material conveying device is a feeding device in an automatic processing and automatic assembly system. Due to its excellent performance in aligning and orienting, high feeding efficiency, and good versatility, it is widely used in various processes such as automatic assembly, automatic processing, and automatic packaging.

[0003] Vibrating material conveying devices can be divided into electromagnetic vibrating material conveying devices and piezoelectric vibrating material conveying devices according to the vibration excitation source. Electromagnetic vibrating material conveying devices have disadvantages such as large volume, heavy weight, high noise, complex structure, high energy consumption, and being unsuitable for precision material transportation. With the development of piezoelectric technology, new drivers using piezoelectric materials as the driving source have attracted more and more attention from researchers.

[0004] In 1977, Japanese technicians developed a piezoelectric vibrating feeder using piezoelectric ceramic sheets as the driving source, which better solved the problems existing in electromagnetic vibrating feeding devices. The linear piezoelectric vibrating feeder developed by Japanese researchers mainly consists of a base, a piezoelectric vibrator, a spring plate, 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 plate generates reciprocating bending deformation under the excitation of the piezoelectric ceramic, inducing the top plate to perform an elliptical motion, thereby transporting materials. The above-mentioned piezoelectric vibrating feeder has the advantages of simple structure, small volume, light weight, low noise, and low energy consumption, but still has the disadvantages of fixed structure form, inability to achieve bidirectional movement, and high requirements for processing and assembly. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a longitudinally and transversely combined linear feeding device driven by piezoelectricity and its working method for the defects involved in the background art.

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

[0007] A longitudinally and transversely combined linear feeding device driven by piezoelectricity, comprising a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, a first to a third stopper, and M + N + P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

[0008] The first piezoelectric vibrator and the second piezoelectric vibrator have the same structure and both comprise a metal substrate and a first to a fourth piezoelectric ceramic sheet;

[0009] The metal substrate is rectangular and vertically arranged. Lugs are provided at its upper end. On one end face, there are first and second grooves parallel to each other, and on the other end face, there are third and fourth grooves parallel to each other. The first and third grooves are symmetrical, and the second and fourth grooves are symmetrical.

[0010] The first to fourth piezoelectric ceramic sheets are respectively arranged in the first to fourth grooves in a one-to-one correspondence, and are polarized along the thickness direction. The polarization directions of the first and second piezoelectric ceramic sheets are the same, the polarization directions of the third and fourth piezoelectric ceramic sheets are the same, and the polarization directions of the first and third piezoelectric ceramic sheets are opposite.

[0011] The metal substrates of the first and second piezoelectric vibrators are both vertically arranged, and their lower ends are fixedly connected to the base.

[0012] The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the lugs at the upper ends of the metal substrates of the first and second piezoelectric vibrators.

[0013] The adjusting bolt includes a nut and a stud.

[0014] On the upper surfaces of the first, second, and third stoppers, there are M, N, and P adjusting grooves respectively. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt.

[0015] On the upper surface of the top plate, there are M + N + P positioning threaded blind holes corresponding one-to-one to the M adjusting grooves on the first stopper, the N adjusting grooves on the second stopper, and the P adjusting grooves on the third stopper.

[0016] The M + N + P adjusting bolts pass through the M + N + P adjusting grooves respectively and are threadedly connected to the M + N + P positioning threaded blind holes one-to-one, fixing the first, second, and third stoppers on the top plate, so that a feeding groove is formed between the first and second stoppers, a discharging groove is formed between the first and third stoppers, and a retracting groove is formed between the second and third stoppers. The included angle between the retracting groove and the discharging groove is an acute angle.

[0017] One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end abuts against the second stopper, which is used to block the feeding groove and the retracting groove in the non-driven state so that the feeding groove and the discharging groove are connected, and to block the feeding groove and the discharging groove in the driven state so that the feeding groove and the retracting groove are connected.

[0018] As a further optimized solution of a longitudinally and transversely combined linear feeding device driven by piezoelectricity according to the present invention, the first to fourth piezoelectric ceramic sheets are respectively adhered to the first to fourth grooves by epoxy resin glue.

[0019] As a further optimized solution of a longitudinally and transversely combined linear feeding device driven by piezoelectricity according to the present invention, the cross-sections of the feeding groove, the discharging groove, and the retracting groove are all rectangular.

[0020] As a further optimized solution of a longitudinally and transversely combined linear feeding device driven by piezoelectricity according to the present invention, the cross-sections of the feeding groove, the discharging groove, and the retracting groove are all isosceles trapezoids with the length of the lower base greater than that of the upper base.

[0021] The present invention also discloses a working method of the longitudinally and transversely combined linear feeding device driven by piezoelectricity, including the following steps:

[0022] Let the first piezoelectric ceramic sheet in the first piezoelectric vibrator and the second piezoelectric vibrator be located above the second piezoelectric ceramic sheet. If the material needs to be transported from the first piezoelectric vibrator to the second piezoelectric vibrator, apply a preset harmonic excitation signal to the second piezoelectric ceramic sheet of the first piezoelectric vibrator, the third piezoelectric ceramic sheet of the first piezoelectric vibrator, the second piezoelectric ceramic sheet of the second piezoelectric vibrator, and the third piezoelectric ceramic sheet of the second piezoelectric vibrator; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first-order longitudinal vibration and the second-order bending vibration, forming an oblique elliptical vibration trajectory at their lugs; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite motion in the vertical and horizontal directions, and the material placed at the feeding groove position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate;

[0023] If the material needs to be transported in the reverse direction, apply a preset harmonic excitation signal to the first piezoelectric ceramic sheet of the first piezoelectric vibrator, the fourth piezoelectric ceramic sheet of the first piezoelectric vibrator, the first piezoelectric ceramic sheet of the second piezoelectric vibrator, and the fourth piezoelectric ceramic sheet of the second piezoelectric vibrator;

[0024] If the feeding groove and the retracting groove need to be blocked and the feeding groove and the discharging groove are connected, do not drive the piezoelectric bimorph;

[0025] If the feeding groove and the discharging groove need to be blocked and the feeding groove and the retracting groove are connected, input a preset DC signal to the piezoelectric bimorph so that the piezoelectric bimorph bends and deforms, separates from the second stopper, and abuts against the first stopper.

[0026] The present invention also discloses another longitudinally and transversely combined linear feeding device driven by piezoelectricity, including a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

[0027] The first piezoelectric vibrator and the second piezoelectric vibrator have the same structure, and both include a pre-tightening bolt, first to fourth beam bodies, and first to third piezoelectric driving units;

[0028] The first to fourth beam bodies are cylinders with the same cross-sectional shape. Among them, a counterbore through hole matching the pre-tightening bolt is provided at the center of the lower end face of the fourth beam body, through holes matching the pre-tightening bolt are provided along the axis of the third beam body and the second beam body, and a pre-tightening threaded blind hole matching the pre-tightening bolt is provided at the center of the lower end face of the first beam body; an ear plate is provided on the upper end face of the first beam body;

[0029] Both the first and third piezoelectric driving units include 2X double-zone piezoelectric ceramic sheets having the same cross-sectional shape as the first beam body, where X is a natural number greater than or equal to 1; a through hole for matching the pre-tightening bolt is provided at the center of the double-zone piezoelectric ceramic sheet, polarized along its thickness direction and with the polarization directions of the two zones being opposite; the 2X double-zone piezoelectric ceramic sheets are stacked in sequence and the dividing lines are coplanar, and the polarization directions of adjacent double-zone piezoelectric ceramic sheets are opposite;

[0030] The second piezoelectric driving unit includes 2X single-zone piezoelectric ceramic sheets having the same cross-sectional shape as the first beam body; a through hole for matching the pre-tightening bolt is provided at the center of the single-zone piezoelectric ceramic sheet, polarized along its thickness direction; the 2X single-zone piezoelectric ceramic sheets are stacked in sequence, and the polarization directions of adjacent single-zone piezoelectric ceramic sheets are opposite;

[0031] The polarization direction of the first piezoelectric ceramic sheet in the first piezoelectric driving unit is opposite to the polarization direction of the first piezoelectric ceramic sheet in the third piezoelectric driving unit;

[0032] The pre-tightening bolt sequentially passes through 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 is threadedly connected to the pre-tightening threaded blind hole of the first beam body, clamping 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;

[0033] Both the first piezoelectric vibrator and the second piezoelectric vibrator are vertically arranged, and the lower end faces of the third beam bodies are fixedly connected to the base;

[0034] The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the ear plates at the upper ends of the first beam bodies in the first piezoelectric vibrator and the second piezoelectric vibrator;

[0035] The adjusting bolt includes a nut and a stud;

[0036] The upper surfaces of the first stop piece, the second stop piece, and the third stop piece are respectively provided with M, N, and P adjusting grooves. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt;

[0037] On the upper surface of the top plate, there are M + N + P positioning threaded blind holes corresponding one-to-one to the M adjusting grooves on the first stop piece, the N adjusting grooves on the second stop piece, and the P adjusting grooves on the third stop piece;

[0038] The M + N + P adjusting bolts respectively pass through the M + N + P adjusting grooves and are threadedly connected to the M + N + P positioning threaded blind holes one-to-one, fixing the first stop piece, the second stop piece, and the third stop piece on the top plate, so that a feeding groove is formed between the first stop piece and the second stop piece, a discharging groove is formed between the first stop piece and the third stop piece, and a retracting groove is formed between the second stop piece and the third stop piece; the included angle between the retracting groove and the discharging groove is an acute angle;

[0039] One end of the piezoelectric bimorph is fixedly connected to the third stop piece, and the other end abuts against the second stop piece, which is used to isolate the feeding groove and the retracting groove to connect the feeding groove and the discharging groove in the non-driven state, and isolate the feeding groove and the discharging groove to connect the feeding groove and the retracting groove in the driven state.

[0040] The working method of this another piezoelectric-driven longitudinal-bending composite linear feeding device includes the following steps:

[0041] If it is necessary to transport the material from the first piezoelectric vibrator to the second piezoelectric vibrator, apply a preset harmonic excitation signal U1 to the second piezoelectric units of the first piezoelectric vibrator and the second piezoelectric vibrator, and at the same time apply a preset harmonic excitation signal U2 to the first piezoelectric unit and the third piezoelectric unit of the first piezoelectric vibrator and the second piezoelectric vibrator. U1 and U2 are harmonic excitation signals with the same excitation voltage and excitation frequency and a phase difference of π / 2; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first-order longitudinal vibration and the second-order bending vibration, forming an oblique elliptical vibration trajectory at their lugs; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite movement in the vertical and horizontal directions, and the material placed at the feeding groove position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate;

[0042] If it is necessary to transport the material in the reverse direction, just adjust the phase difference of the U1 and U2 signals to -π / 2;

[0043] If it is necessary to isolate the feeding groove and the retracting groove and connect the feeding groove and the discharging groove, just do not drive the piezoelectric bimorph;

[0044] If it is necessary to isolate the feeding trough and the discharging trough, and connect the feeding trough and the retracting trough, a preset DC signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph can be bent.

[0045] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

[0046] 1. By adopting the coupled mode of the first-order longitudinal vibration and the second-order bending vibration of the piezoelectric vibrator for driving, an inclined elliptical motion trajectory can be naturally formed, the structure of the inclined spring piece is cancelled, and the device has a simple structure and is easy to process and assemble;

[0047] 2. By adopting the excitation method of piezoelectric ceramic sheets arranged diagonally, exciting two piezoelectric ceramic sheets arranged diagonally differently can excite inclined elliptical motion trajectories with different inclination angles, so as to realize the bidirectional movement of materials;

[0048] 3. The piezoelectric bimorph arranged on the third baffle is used for screening materials, realizing the integration of structure and function;

[0049] 4. By adjusting the bolts, the positions of the first to third baffles can be adjusted, and further the widths of the feeding trough, the discharging trough and the retracting trough can be adjusted. Description of the Drawings

[0050] Figure 1 It is a schematic structural diagram of the present invention;

[0051] Figure 2 It is a schematic structural diagram of the first piezoelectric vibrator in the present invention;

[0052] Figure 3 It is a schematic diagram of the electrical signal application method of the first piezoelectric vibrator in the present invention;

[0053] Figure 4 It is a schematic diagram of the simulation of the coupled mode of the first-order longitudinal vibration and the second-order bending vibration of the first piezoelectric vibrator in the present invention;

[0054] Figure 5 It is a schematic diagram of the working principle of the top plate in the present invention;

[0055] Figure 6 It is a schematic diagram of the state comparison of the piezoelectric bimorph before and after being driven in the present invention;

[0056] Figure 7 It is another schematic structural diagram of the present invention;

[0057] Figure 8 It is a schematic diagram of the electrical signal application method of the first piezoelectric vibrator in another structure of the present invention.

[0058] In the figure, 1 - base, 2 - first piezoelectric vibrator, 3 - second piezoelectric vibrator, 4 - top plate, 5 - first stopper, 6 - second stopper, 7 - third stopper, 8 - adjusting bolt, 9 - piezoelectric bimorph, 10 - metal substrate, 11 - first piezoelectric ceramic sheet, 12 - second piezoelectric ceramic sheet, 13 - third piezoelectric ceramic sheet, 14 - fourth piezoelectric ceramic sheet. Detailed implementation mode

[0059] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings:

[0060] The present invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. On the contrary, these embodiments are provided so that this disclosure is thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0061] It should be understood that although terms such as first, second, and third 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 only used to distinguish one element, component, and / or part from another. Thus, the first element, component, and / or part discussed below may become the second element, component, or part without departing from the teachings of the present invention.

[0062] In order to achieve the bidirectional movement of the piezoelectric vibration material conveying device and simplify the device structure, the present invention proposes a piezoelectric-driven longitudinal-bending composite linear feeding device and its working method. On the basis of the structure of the traditional piezoelectric vibration feeding device, the device cancels the spring plate structure, adopts the coupling mode of the first-order longitudinal vibration and the second-order bending vibration of the piezoelectric vibrator, and uses the naturally generated inclined elliptical vibration of the coupling mode to drive the material tray to generate material movement in the vertical and horizontal directions, thereby driving the material transportation. Moreover, by changing the excitation signal mode of the piezoelectric ceramic sheets on the piezoelectric vibrator, the movement of the material tray in the other inclined direction can be realized, thereby realizing the reverse transportation of the material.

[0063] As Figure 1 shown, the present invention discloses a piezoelectric-driven longitudinal-bending composite linear feeding device, which includes a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

[0064] As Figure 2 shown, the first piezoelectric vibrator and the second piezoelectric vibrator have the same structure and both include a metal substrate and first to fourth piezoelectric ceramic sheets;

[0065] The metal substrate is rectangular and vertically arranged. An earpiece is provided at its upper end. On one end face, there are parallel first and second grooves, and on the other end face, there are parallel third and fourth grooves; the first and third grooves are symmetric, and the second and fourth grooves are symmetric;

[0066] The first to fourth piezoelectric ceramic sheets are correspondingly arranged in the first to fourth grooves respectively, and are polarized along the thickness direction. The polarization directions of the first and second piezoelectric ceramic sheets are the same, the polarization directions of the third and fourth piezoelectric ceramic sheets are the same, and the polarization directions of the first and third piezoelectric ceramic sheets are opposite;

[0067] The metal substrates of the first and second piezoelectric vibrators are both vertically arranged, and their lower ends are fixedly connected to the base;

[0068] The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the earpieces at the upper ends of the metal substrates of the first and second piezoelectric vibrators;

[0069] The adjusting bolt includes a nut and a stud;

[0070] On the upper surfaces of the first, second, and third stoppers, there are M, N, and P adjusting grooves respectively. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt;

[0071] On the upper surface of the top plate, there are M + N + P positioning threaded blind holes corresponding to the M adjusting grooves on the first stopper, the N adjusting grooves on the second stopper, and the P adjusting grooves on the third stopper;

[0072] The M + N + P adjusting bolts pass through the M + N + P adjusting grooves correspondingly and are threadedly connected to the M + N + P positioning threaded blind holes correspondingly, fixing the first, second, and third stoppers on the top plate, so that a feeding groove is formed between the first and second stoppers, a discharging groove is formed between the first and third stoppers, and a retracting groove is formed between the second and third stoppers; the included angle between the retracting groove and the discharging groove is an acute angle;

[0073] One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end abuts against the second stopper, which is used to block the feeding groove and the retracting groove to connect the feeding groove and the discharging groove in the non-driving state, and block the feeding groove and the discharging groove to connect the feeding groove and the retracting groove in the driving state.

[0074] The first to fourth piezoelectric ceramic sheets are respectively adhesively pasted in the first to fourth grooves by epoxy resin glue.

[0075] The cross-sections of the feeding chute, the discharging chute, and the retracting chute are all rectangular or isosceles trapezoids with the length of the lower base greater than that of the upper base.

[0076] The present invention also discloses a working method of the longitudinal-bending composite linear feeding device driven by piezoelectricity, including the following steps:

[0077] Let the first piezoelectric ceramic sheet of the first piezoelectric vibrator and the second piezoelectric vibrator be located above the second piezoelectric ceramic sheet. If the material needs to be transported from the first piezoelectric vibrator to the second piezoelectric vibrator, a preset harmonic excitation signal is applied to the second piezoelectric ceramic sheet of the first piezoelectric vibrator, the third piezoelectric ceramic sheet of the first piezoelectric vibrator, the second piezoelectric ceramic sheet of the second piezoelectric vibrator, and the third piezoelectric ceramic sheet of the second piezoelectric vibrator, as Figure 3 shown; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first-order longitudinal vibration and the second-order bending vibration, forming an oblique elliptical vibration trajectory at their lugs, as Figure 4 shown; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite motion in the vertical and horizontal directions, as Figure 5 shown, and the material placed in the feeding chute position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate;

[0078] If the material needs to be transported in the reverse direction, a preset harmonic excitation signal is applied to the first piezoelectric ceramic sheet of the first piezoelectric vibrator, the fourth piezoelectric ceramic sheet of the first piezoelectric vibrator, the first piezoelectric ceramic sheet of the second piezoelectric vibrator, and the fourth piezoelectric ceramic sheet of the second piezoelectric vibrator;

[0079] As Figure 6 shown, if the feeding chute and the retracting chute need to be blocked and the feeding chute and the discharging chute are connected, the piezoelectric bimorph is not driven;

[0080] If the feeding chute and the discharging chute need to be blocked and the feeding chute and the retracting chute are connected, a preset DC signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph bends and deforms, separates from the second stop member, and abuts against the first stop member.

[0081] As Figure 7 shown, the present invention also discloses another longitudinal-bending composite linear feeding device driven by piezoelectricity, including a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stop members, and M + N + P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

[0082] The first piezoelectric vibrator and the second piezoelectric vibrator have the same structure, and both include a pre-tightening bolt, first to fourth beam bodies, and first to third piezoelectric driving units;

[0083] The first to fourth beam bodies are cylinders with the same cross-sectional shape. Among them, a counterbore through hole that mates with the pre-tightening bolt is provided at the center of the lower end face of the fourth beam body. Through holes that mate with the pre-tightening bolt are provided along the axes of the third beam body and the second beam body. A pre-tightening threaded blind hole that mates with the pre-tightening bolt is provided at the center of the lower end face of the first beam body; an ear plate is provided on the upper end face of the first beam body;

[0084] Each of the first and third piezoelectric drive units includes 2X double-zone piezoelectric ceramic sheets having the same cross-sectional shape as the first beam body, where X is a natural number greater than or equal to 1; a through hole for mating with the pre-tightening bolt is provided at the center of the double-zone piezoelectric ceramic sheet, which is polarized along its thickness direction and the polarization directions of the two zones are opposite; the 2X double-zone piezoelectric ceramic sheets are stacked in sequence and the dividing lines are coplanar, and the polarization directions of adjacent double-zone piezoelectric ceramic sheets are opposite;

[0085] The second piezoelectric drive unit includes 2X single-zone piezoelectric ceramic sheets having the same cross-sectional shape as the first beam body; a through hole for mating with the pre-tightening bolt is provided at the center of the single-zone piezoelectric ceramic sheet, which is polarized along its thickness direction; the 2X single-zone piezoelectric ceramic sheets are stacked in sequence, and the polarization directions of adjacent single-zone piezoelectric ceramic sheets are opposite;

[0086] The polarization direction of the first piezoelectric ceramic sheet in the first piezoelectric drive unit is opposite to the polarization direction of the first piezoelectric ceramic sheet in the third piezoelectric drive unit;

[0087] The pre-tightening bolt sequentially passes through the fourth beam body, the third piezoelectric drive unit, the third beam body, the second piezoelectric drive unit, the second beam body, the first piezoelectric drive unit and then is threadedly connected to the pre-tightening threaded blind hole of the first beam body, clamping the fourth beam body, the third piezoelectric drive unit, the third beam body, the second piezoelectric drive unit, the second beam body, the first piezoelectric drive unit and the first beam body;

[0088] The first piezoelectric vibrator and the second piezoelectric vibrator are both vertically arranged, and the lower end face of the third beam body is fixedly connected to the base;

[0089] The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the ear plates at the upper ends of the first beam bodies in the first piezoelectric vibrator and the second piezoelectric vibrator;

[0090] The adjusting bolt includes a nut and a stud;

[0091] M adjusting grooves, N adjusting grooves and P adjusting grooves are respectively provided on the upper surfaces of the first stop member, the second stop member and the third stop member. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt;

[0092] There are M + N + P positioning threaded blind holes on the upper surface of the top plate, which correspond one by one to the M adjusting grooves on the first stopper, the N adjusting grooves on the second stopper, and the P adjusting grooves on the third stopper.

[0093] The M + N + P adjusting bolts pass through the M + N + P adjusting grooves one by one and are threadedly connected to the M + N + P positioning threaded blind holes one by one, fixing the first stopper, the second stopper, and the third stopper on the top plate, so that a feeding groove is formed between the first stopper and the second stopper, a discharging groove is formed between the first stopper and the third stopper, and a retracting groove is formed between the second stopper and the third stopper; the included angle between the retracting groove and the discharging groove is an acute angle.

[0094] One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end abuts against the second stopper, which is used to block the feeding groove and the retracting groove to connect the feeding groove and the discharging groove in the non - driving state, and block the feeding groove and the discharging groove to connect the feeding groove and the retracting groove in the driving state.

[0095] The working method of this another piezoelectric - driven longitudinal - bending composite linear feeding device includes the following steps:

[0096] As Figure 8 shown, if it is necessary to transport the material from the first piezoelectric vibrator to the second piezoelectric vibrator, a preset harmonic excitation signal U1 is applied to the second piezoelectric units of the first piezoelectric vibrator and the second piezoelectric vibrator, and at the same time, a preset harmonic excitation signal U2 is applied to the first piezoelectric unit and the third piezoelectric unit of the first piezoelectric vibrator and the second piezoelectric vibrator. U1 and U2 are harmonic excitation signals with the same excitation voltage and excitation frequency and a phase difference of π / 2; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first - order longitudinal vibration and the second - order bending vibration, forming an oblique elliptical vibration trajectory at their lugs; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite motion in the vertical and horizontal directions, and the material placed at the feeding groove position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate.

[0097] If it is necessary to transport the material in the reverse direction, just adjust the phase difference between the U1 and U2 signals to -π / 2.

[0098] If it is necessary to block the feeding groove and the retracting groove and connect the feeding groove and the discharging groove, just do not drive the piezoelectric bimorph.

[0099] If it is necessary to block the feeding groove and the discharging groove and connect the feeding groove and the retracting groove, input a preset DC signal to the piezoelectric bimorph to make the piezoelectric bimorph bend.

[0100] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such herein.

[0101] The specific embodiments described above further elaborate on the object, technical solution and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A piezoelectrically driven longitudinal-bending composite linear feeding device, characterized in that, It includes a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1; The first piezoelectric vibrator and the second piezoelectric vibrator have the same structure and both include a metal substrate and first to fourth piezoelectric ceramic sheets; The metal substrate is rectangular and vertically arranged. It has lugs at its upper end, and first and second grooves parallel to each other are provided on one end face, and third and fourth grooves parallel to each other are provided on the other end face; the first groove and the third groove are symmetric, and the second groove and the fourth groove are symmetric; The first to fourth piezoelectric ceramic sheets are respectively arranged in the first to fourth grooves in a one-to-one correspondence, and are all polarized along the thickness direction. The polarization directions of the first and second piezoelectric ceramic sheets are the same, the polarization directions of the third and fourth piezoelectric ceramic sheets are the same, and the polarization directions of the first and third piezoelectric ceramic sheets are opposite; The metal substrates of the first piezoelectric vibrator and the second piezoelectric vibrator are both vertically arranged, and their lower ends are both fixedly connected to the base; The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the lugs at the upper ends of the metal substrates of the first piezoelectric vibrator and the second piezoelectric vibrator; The adjusting bolt includes a nut and a stud; The upper surfaces of the first stopper, the second stopper, and the third stopper are respectively provided with M, N, and P adjusting grooves. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt; On the upper surface of the top plate, there are M + N + P positioning threaded blind holes corresponding one-to-one to the M adjusting grooves on the first stopper, the N adjusting grooves on the second stopper, and the P adjusting grooves on the third stopper; The M + N + P adjusting bolts pass through the M + N + P adjusting grooves in a one-to-one correspondence and are threadedly connected to the M + N + P positioning threaded blind holes in a one-to-one correspondence, fixing the first stopper, the second stopper, and the third stopper on the top plate, so that a feeding groove is formed between the first stopper and the second stopper, a discharging groove is formed between the first stopper and the third stopper, and a retracting groove is formed between the second stopper and the third stopper; the included angle between the retracting groove and the discharging groove is an acute angle; One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end abuts against the second stopper, and is used to block the feeding groove and the retracting groove in the non-driving state so that the feeding groove and the discharging groove are connected, and to block the feeding groove and the discharging groove in the driving state so that the feeding groove and the retracting groove are connected.

2. The piezoelectrically-driven longitudinal-bending composite linear feeding device according to claim 1, wherein The first to fourth piezoelectric ceramic sheets are respectively adhesively pasted in the first to fourth grooves through epoxy resin glue.

3. The piezoelectric-driven longitudinal-bending composite linear feeding device according to claim 1, wherein The cross-sections of the feeding groove, the discharging groove, and the retracting groove are all rectangular.

4. The piezoelectrically driven longitudinal-bending composite linear feeding device according to claim 1, characterized in that The cross-sections of the feeding groove, the discharging groove, and the retracting groove are all isosceles trapezoids with the length of the lower base greater than the length of the upper base.

5. The working method of the longitudinal-bending composite linear feeding device driven by piezoelectricity according to claim 1, characterized in that It includes the following steps: Let the first piezoelectric ceramic sheet of the first piezoelectric vibrator and the second piezoelectric vibrator be located above the second piezoelectric ceramic sheet. If the material needs to be transported from the first piezoelectric vibrator to the second piezoelectric vibrator, a preset harmonic excitation signal is applied to the second piezoelectric ceramic sheet of the first piezoelectric vibrator, the third piezoelectric ceramic sheet of the first piezoelectric vibrator, the second piezoelectric ceramic sheet of the second piezoelectric vibrator, and the third piezoelectric ceramic sheet of the second piezoelectric vibrator; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first-order longitudinal vibration and the second-order bending vibration, forming an oblique elliptical vibration trajectory at their lugs; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite motion in the vertical and horizontal directions, and the material placed in the feeding groove position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate; If the material needs to be transported in the reverse direction, a preset harmonic excitation signal is applied to the first piezoelectric ceramic sheet of the first piezoelectric vibrator, the fourth piezoelectric ceramic sheet of the first piezoelectric vibrator, the first piezoelectric ceramic sheet of the second piezoelectric vibrator, and the fourth piezoelectric ceramic sheet of the second piezoelectric vibrator; If the feeding groove and the retracting groove need to be blocked and the feeding groove and the discharging groove are connected, the piezoelectric bimorph is not driven; If the feeding groove and the discharging groove need to be blocked and the feeding groove and the retracting groove are connected, a preset direct current signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph bends and deforms, separates from the second stopper and abuts against the first stopper; 6. A piezoelectrically driven longitudinal-bending composite linear feeding device, characterized in that, It includes a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts, where M, N, and P are natural numbers greater than or equal to 1; The first piezoelectric vibrator and the second piezoelectric vibrator have the same structure and both include a pre-tightening bolt, first to fourth beam bodies, and first to third piezoelectric driving units; The first to fourth beam bodies are cylinders with the same cross-sectional shape. Among them, a counterbore through hole matching the pre-tightening bolt is provided at the center of the lower end surface of the fourth beam body, through holes matching the pre-tightening bolt are provided along the axis of the third beam body and the second beam body, and a pre-tightening threaded blind hole matching the pre-tightening bolt is provided at the center of the lower end surface of the first beam body; an earpiece is provided on the upper end surface of the first beam body; Both the first and third piezoelectric driving units include 2X double-zone piezoelectric ceramic sheets with the same cross-sectional shape as the first beam body, where X is a natural number greater than or equal to 1; a through hole for matching the pre-tightening bolt is provided at the center of the double-zone piezoelectric ceramic sheet, and it is polarized along its thickness direction with the polarization directions of the two zones being opposite; the 2X double-zone piezoelectric ceramic sheets are stacked in sequence and the dividing lines are coplanar, and the polarization directions of adjacent double-zone piezoelectric ceramic sheets are opposite; The second piezoelectric driving unit includes 2X single-zone piezoelectric ceramic sheets with the same cross-sectional shape as the first beam body; a through hole for matching the pre-tightening bolt is provided at the center of the single-zone piezoelectric ceramic sheet, and it is polarized along its thickness direction; the 2X single-zone piezoelectric ceramic sheets are stacked in sequence, and the polarization directions of adjacent single-zone piezoelectric ceramic sheets are opposite; The polarization direction of the first piezoelectric ceramic sheet in the first piezoelectric driving unit is opposite to that of the first piezoelectric ceramic sheet in the third piezoelectric driving unit; The pre-tightening bolt sequentially passes through 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 is threadedly connected to the pre-tightening threaded blind hole of the first beam body to clamp 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; The first piezoelectric vibrator and the second piezoelectric vibrator are both vertically arranged, and the lower end surfaces of the fourth beam body are fixedly connected to the base; The top plate is a rectangular plate, and its two ends are respectively fixedly connected to the lugs at the upper ends of the first beam body in the first piezoelectric vibrator and the second piezoelectric vibrator; The adjusting bolt includes a nut and a stud; The upper surfaces of the first stopper, the second stopper, and the third stopper are respectively provided with M, N, and P adjusting grooves. The adjusting grooves are all strip-shaped grooves perpendicular to the top plate, and the adjusting grooves are all provided with strip-shaped through grooves perpendicular to the top plate. The width of the adjusting groove is greater than the diameter of the nut of the adjusting bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjusting bolt and greater than the diameter of the stud of the adjusting bolt; There are M+N+P positioning threaded blind holes on the upper surface of the top plate that correspond one-to-one to the M adjusting grooves on the first stopper, the N adjusting grooves on the second stopper, and the P adjusting grooves on the third stopper; The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one and are threadedly connected to the M+N+P positioning threaded blind holes one by one to fix the first stopper, the second stopper, and the third stopper on the top plate, so that a feeding groove is formed between the first stopper and the second stopper, a discharging groove is formed between the first stopper and the third stopper, and a retracting groove is formed between the second stopper and the third stopper; the included angle between the retracting groove and the discharging groove is an acute angle; One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end abuts against the second stopper, which is used to block the feeding groove and the retracting groove in the non-driving state so that the feeding groove and the discharging groove are connected, and to block the feeding groove and the discharging groove in the driving state so that the feeding groove and the retracting groove are connected.

7. The working method of the longitudinal-bending composite linear feeding device driven by piezoelectricity according to claim 6, characterized in that, It includes the following steps: If the material needs to be transported from the first piezoelectric vibrator to the second piezoelectric vibrator, a preset harmonic excitation signal U1 is applied to the second piezoelectric units of the first piezoelectric vibrator and the second piezoelectric vibrator, and at the same time, a preset harmonic excitation signal U2 is applied to the first piezoelectric unit and the third piezoelectric unit of the first piezoelectric vibrator and the second piezoelectric vibrator. U1 and U2 are harmonic excitation signals with the same excitation voltage and excitation frequency and a phase difference of π / 2; at this time, the first piezoelectric vibrator and the second piezoelectric vibrator excite a coupled vibration mode of the first-order longitudinal vibration and the second-order bending vibration, forming an oblique elliptical vibration trajectory at their lugs; the coupled vibration mode of the first piezoelectric vibrator and the second piezoelectric vibrator drives the top plate to generate a composite motion in the vertical and horizontal directions, and the material placed at the feeding groove position of the top plate is transported from the first piezoelectric vibrator to the second piezoelectric vibrator under the composite vibration of the top plate; If reverse material transportation is required, adjust the phase difference between the U1 and U2 signals to -π / 2; If the feeding trough and the retracting trough need to be blocked and the feeding trough and the discharging trough need to be connected, do not drive the piezoelectric bimorph; If the feeding trough and the discharging trough need to be blocked and the feeding trough and the retracting trough need to be connected, input a preset DC signal to the piezoelectric bimorph to make the piezoelectric bimorph bend.

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