A sandwich-type piezoelectric-driven linear vibration feeding device and its working method

Abstract

The present invention discloses a linear vibration feeding device driven by a sandwich-type piezoelectric and its working method. The device includes a base, first to fourth spring pieces, first to second connecting blocks, first to second piezoelectric transducers, first to second brackets, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts. During operation, by applying a sinusoidal excitation signal to the first and second piezoelectric transducers, the first-order longitudinal vibration modes of the first and second piezoelectric transducers can be excited, inducing reciprocating bending vibrations of the third and fourth spring pieces, driving the top plate to generate displacements in the horizontal and vertical directions, causing the material to generate displacements in the horizontal and vertical directions under the action of friction. When the top plate reaches the limit position and moves back, the material continues to generate a horizontal displacement in a parabolic shape and fall due to inertia, achieving a single movement. Under the periodic movement of the reciprocating swing of the top plate, the material is continuously transported. The structure of the present invention is simple and easy to process and assemble.

Description

Technical Field

[0001] The present invention relates to the fields of piezoelectric feeders, material transportation, and micro-particle transportation, and particularly to a linear vibration feeding device driven by a sandwich-type piezoelectric and its working method. Background Art

[0002] A vibrating material conveying device is a device that uses vibration to drive material conveyance. It is a commonly used feeding device in industrial production, and its function is to form alignment, sorting, and directional conveyance of materials. It has important application value in production fields that require automated precision conveyance, such as the testing and packaging links of modern precision semiconductor devices, surface mount technology, and micro machinery.

[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. Feeding devices using electromagnets as the driving source have been widely used in production lines. However, such electromagnetic vibrating feeders have disadvantages such as high noise, low energy conversion rate, and being unsuitable for precision material conveyance. 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, researchers from NGK Insulators, Ltd. in Japan first proposed a piezoelectric vibrating feeder using a rectangular piezoelectric ceramic sheet as the driving source. 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 conveying materials. Due to the use of patch-type piezoelectric ceramic sheets for excitation, the above-mentioned piezoelectric vibrating feeder has disadvantages such as small amplitude, poor conveying performance, and poor conveying stability.

[0005] Common piezoelectric feeding devices on the market currently are based on the above-mentioned piezoelectric vibrating feeder with a mass added. The amplitude of the top plate is increased by the inertia added by the mass, thereby improving the conveying effect. The above-mentioned piezoelectric vibrating feeder mainly uses a piezoelectric bimorph for driving, utilizing the d31 effect of piezoelectric ceramics. The d31 parameter of piezoelectric ceramics is much smaller than d33. Therefore, the efficiency of the patch-type piezoelectric vibrating feeder is much lower than that of the sandwich-type piezoelectric vibrating feeder. The introduction of the mass poses higher requirements for the processing and assembly of the device. In addition, due to the inclined arrangement of the spring plate, the part structure of the above-mentioned device has various complex angles, so processing and assembly are both difficult. Since the inclination angle of the spring plate is fixed and cannot be changed, the horizontal and vertical displacements of the top plate are fixed, and it can only be applicable to transporting a certain type of material and cannot transport other types of materials. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a linear vibration feeding device driven by a sandwich-type piezoelectric and its working method to address the deficiencies in the background art.

[0007] The present invention adopts the following technical solutions to solve the above technical problems:

[0008] A linear vibration feeding device driven by a sandwich-type piezoelectric includes a base, first to fourth spring pieces, first to second connecting blocks, first to second piezoelectric transducers, first to second brackets, 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;

[0009] The first piezoelectric transducer and the second piezoelectric transducer have the same structure, and both include a front beam, a first piezoelectric unit, a clamping member, a second piezoelectric unit, a rear beam, and a pre-tightening bolt;

[0010] The front beam includes an end portion, an enlarged portion, and a root portion. Among them, both the end portion and the root portion are cylinders, 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 frustum of a 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 with the smaller area of the enlarged portion is coaxially fixed to one end of the end portion, and the end with the larger area is coaxially fixed to one end of the root portion; a threaded blind hole matching the preset bolt is provided at the center of the end face of the root portion far from the enlarged portion;

[0011] The rear beam is a cylinder with a cross-section having the same shape as the end face of the root portion of the front beam, and a countersunk through hole matching the pre-tightening bolt is provided at the center of one end face of the rear beam;

[0012] Both the first piezoelectric unit and the second piezoelectric unit include Q circular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the Q piezoelectric ceramic sheets are stacked in sequence, polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

[0013] The clamping member includes a clamping portion and a fixing portion. The clamping portion has the same shape as the piezoelectric ceramic sheet, and the fixing portion is connected to the side wall of the clamping portion through a flexible hinge;

[0014] The first pre-tightening bolt sequentially passes through the countersunk through hole of the rear beam, the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, the second piezoelectric unit, and then is threadedly connected to the threaded blind hole of the front beam to clamp and coaxialize the rear beam, the first piezoelectric unit, the clamping member, the second piezoelectric unit, and the front beam; the polarization direction of the Qth piezoelectric ceramic sheet of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic sheet of the second piezoelectric unit;

[0015] The top plate is a rectangular plate;

[0016] The first to fourth spring pieces are all rectangular spring pieces. The first and second spring pieces have the same structure, and the third and fourth spring pieces have the same structure;

[0017] The first and second spring pieces are arranged in parallel. Their lower ends are both fixedly connected to the base, and their upper ends are respectively fixedly connected to the first connecting block and the second connecting block;

[0018] The third and fourth spring pieces are arranged in parallel. Their lower ends are respectively fixedly connected to the first connecting block and the second connecting block, and their upper ends are respectively fixedly connected to both ends of the top plate, so that the top plate is horizontally arranged, and the included angle between the third spring piece and the horizontal plane is not equal to 90°;

[0019] The end of the front beam of the first piezoelectric transducer is fixedly connected to the first connecting block, and the fixing part of the clamping member of the first piezoelectric transducer is fixedly connected to the base through the first bracket; the end of the front beam of the second piezoelectric transducer is fixedly connected to the second connecting block, and the fixing part of the clamping member of the second piezoelectric transducer is fixedly connected to the base through the second bracket;

[0020] The axis of the rear beam of the first piezoelectric transducer is parallel to the axis of the rear beam of the second piezoelectric transducer;

[0021] The adjusting bolt includes a nut and a stud;

[0022] The upper surfaces of the first stop member, the second stop member, and the third stop member 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;

[0023] The upper surface of the top plate is provided with M + N + P positioning threaded blind holes corresponding one-to-one to the M adjusting grooves on the first stop member, the N adjusting grooves on the second stop member, and the P adjusting grooves on the third stop member;

[0024] 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 member, the second stop member, and the third stop member on the top plate, so that a feeding groove is formed between the first stop member and the second stop member, a discharging groove is formed between the first stop member and the third stop member, and a retracting groove is formed between the second stop member and the third stop member; the included angle between the retracting groove and the discharging groove is an acute angle;

[0025] One end of the piezoelectric bimorph is fixedly connected to the third stop member, and the other end abuts against the second stop member, and is used for blocking the feeding groove and the retracting groove to connect the feeding groove and the discharging groove in the non-driven state, and blocking the feeding groove and the discharging groove to connect the feeding groove and the retracting groove in the driven state.

[0026] As a further optimized solution of the linear vibration feeding device with sandwich piezoelectric drive of the present invention, a plurality of clamping keys are circumferentially arranged on the front beams of the first piezoelectric transducer and the second piezoelectric transducer.

[0027] As a further optimized solution of the linear vibration feeding device with sandwich piezoelectric drive of the present invention, Q is taken as 2.

[0028] The present invention also discloses a working method of the linear vibration feeding device with sandwich piezoelectric drive, including the following steps:

[0029] If it is necessary to transport materials from the first piezoelectric transducer to the second piezoelectric transducer, a sinusoidal alternating current excitation signal U1 is applied to the first piezoelectric transducer, and a sinusoidal alternating current excitation signal U2 is applied to the second piezoelectric transducer. U1 and U2 have the same frequency and voltage and there is a 180° phase difference, exciting the first-order longitudinal vibration modes of the first and second piezoelectric transducers, and there is a 180° phase difference in the vibration modes; at this time, the vibrations of the first and second piezoelectric transducers are transmitted to the third and fourth spring plates, inducing reciprocating bending vibrations of the third and fourth spring plates, and then driving the top plate to generate displacements in the horizontal and vertical directions, so that the materials are transported from the first piezoelectric transducer to the second piezoelectric transducer;

[0030] If it is necessary to isolate the feeding trough and the retracting trough and connect the feeding trough and the discharging trough, the piezoelectric bimorph in the non-driven state can be used;

[0031] If it is necessary to isolate the feeding trough and the discharging trough and connect the feeding trough and the retracting trough, a preset direct current 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.

[0032] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

[0033] 1. The structure is simple and the assembly is easy, which can simplify the design, reduce the difficulty of processing and assembly, and thus reduce the equipment cost;

[0034] 2. Using the piezoelectric transducer as the driving source, compared with the vibration feeder driven by the bimorph, the amplitude can be effectively increased, thereby improving the material conveying capacity of the vibration feeder;

[0035] 3. Adopting the replaceable connecting block structure, the inclination angle of the spring plate can be adjusted by replacing the connecting block to cope with the transportation conditions of different materials, expanding the application scenarios of the device;

[0036] 4. By adjusting the bolts, the positions of the first to third stop members 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

[0037] Figure 1 is a schematic structural diagram in the present invention;

[0038] Figure 2 is a schematic structural diagram of the first piezoelectric transducer in the present invention;

[0039] Figure 3 is a schematic cross-sectional view of the structure of the first piezoelectric transducer in the present invention;

[0040] Figure 4 is a schematic diagram for comparing the states of the piezoelectric bimorph when not driven and when driven in the present invention.

[0041] In the figure, 1 - base, 2 - first bracket, 3 - second bracket, 4 - first piezoelectric transducer, 5 - second piezoelectric transducer, 6 - first spring piece, 7 - second spring piece, 8 - third spring piece, 9 - fourth spring piece, 10 - first connecting block, 11 - second connecting block, 12 - top plate, 13 - adjusting bolt, 14 - first stopper, 15 - second stopper, 16 - third stopper, 17 - piezoelectric bimorph, 18 - end of the front beam, 19 - enlarged portion of the front beam, 20 - root of the front beam, 21 - second piezoelectric unit, 22 - first piezoelectric unit, 23 - clamping member, 24 - rear beam, 25 - pre-tightening bolt. Specific embodiments

[0042] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings:

[0043] 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 will be 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.

[0044] 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 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.

[0045] As Figure 1 shown, the present invention discloses a linear vibration feeding device driven by a sandwich piezoelectric, comprising a base, first to fourth spring pieces, first to second connecting blocks, first to second piezoelectric transducers, first to second brackets, 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;

[0046] As shown Figure 2 The first piezoelectric transducer and the second piezoelectric transducer have the same structure and both include a front beam, a first piezoelectric unit, a clamping member, a second piezoelectric unit, a rear beam, and a pre-tightening bolt;

[0047] The front beam includes an end portion, an amplifying portion, and a root portion. Among them, both the end portion and the root portion are cylinders, 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 amplifying portion is a frustum of a 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 with the smaller area of the amplifying portion is coaxially fixed to one end of the end portion, and the end with the larger area is coaxially fixed to one end of the root portion; a threaded blind hole matching with the preset bolt is provided at the center of the end face of the root portion far from the amplifying portion;

[0048] The rear beam is a cylinder with a cross-section having the same shape as the end face of the root portion of the front beam, and a countersunk through hole matching with the pre-tightening bolt is provided at the center of one end face of the rear beam;

[0049] Both the first piezoelectric unit and the second piezoelectric unit include Q circular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the Q piezoelectric ceramic sheets are stacked in sequence, polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

[0050] The clamping member includes a clamping portion and a fixing portion. The clamping portion has the same shape as the piezoelectric ceramic sheet, and the fixing portion is connected to the side wall of the clamping portion through a flexible hinge;

[0051] As shown Figure 3 The first pre-tightening bolt sequentially passes through the countersunk through hole of the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, the second piezoelectric unit, and then is threadedly connected to the threaded blind hole of the front beam, 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 Qth piezoelectric ceramic sheet of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic sheet of the second piezoelectric unit;

[0052] The top plate is a rectangular plate;

[0053] The first to fourth spring pieces are all rectangular spring pieces, and the first and second spring pieces have the same structure, and the third and fourth spring pieces have the same structure;

[0054] The first and second spring pieces are arranged in parallel, and their lower ends are both fixed to the base, and their upper ends are respectively fixed to the first connecting block and the second connecting block;

[0055] The third and fourth spring pieces are arranged in parallel, their lower ends are respectively fixed to the first connecting block and the second connecting block, and their upper ends are respectively fixed to both ends of the top plate, making the top plate horizontally arranged, and the angle between the third spring piece and the horizontal plane is not equal to 90°;

[0056] The end of the front beam of the first piezoelectric transducer is fixedly connected to the first connecting block, and the fixing part of the clamping member of the first piezoelectric transducer is fixedly connected to the base through the first bracket; the end of the front beam of the second piezoelectric transducer is fixedly connected to the second connecting block, and the fixing part of the clamping member of the second piezoelectric transducer is fixedly connected to the base through the second bracket;

[0057] The axis of the rear beam of the first piezoelectric transducer is parallel to the axis of the rear beam of the second piezoelectric transducer;

[0058] The adjusting bolt includes a nut and a stud;

[0059] The upper surfaces of the first stop member, the second stop member, and the third stop member 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;

[0060] The upper surface of the top plate is provided with M + N + P positioning threaded blind holes corresponding one by one to the M adjusting grooves on the first stop member, the N adjusting grooves on the second stop member, and the P adjusting grooves on the third stop member;

[0061] 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 stop member, the second stop member, and the third stop member on the top plate, so that a feeding groove is formed between the first stop member and the second stop member, a discharging groove is formed between the first stop member and the third stop member, and a retracting groove is formed between the second stop member and the third stop member; the included angle between the retracting groove and the discharging groove is an acute angle;

[0062] One end of the piezoelectric bimorph is fixedly connected to the third stop member, and the other end abuts against the second stop member, which is used to isolate the feeding groove and the retracting groove to connect the feeding groove and the discharging groove in the non-driving state, and isolate the feeding groove and the discharging groove to connect the feeding groove and the retracting groove in the driving state.

[0063] A plurality of keys for clamping are circumferentially provided on the front beams of the first piezoelectric transducer and the second piezoelectric transducer.

[0064] Preferably, Q takes 2.

[0065] The present invention also discloses a working method of the sandwich piezoelectric-driven linear vibration feeding device, including the following steps:

[0066] If it is necessary to transport materials from the first piezoelectric transducer towards the second piezoelectric transducer, a sinusoidal alternating excitation signal U1 is applied to the first piezoelectric transducer, and a sinusoidal alternating excitation signal U2 is applied to the second piezoelectric transducer. The frequencies and voltages of U1 and U2 are the same and there is a 180° phase difference, which excites the first-order longitudinal vibration modes of the first and second piezoelectric transducers, and there is a 180° phase difference in the vibration modes. At this time, the vibrations of the first and second piezoelectric transducers are transmitted to the third and fourth spring plates, inducing reciprocating bending vibrations of the third and fourth spring plates, and then driving the top plate to generate displacements in the horizontal and vertical directions, so that the materials are transported from the first piezoelectric transducer towards the second piezoelectric transducer.

[0067] If it is necessary to isolate the feeding trough and the retracting trough and connect the feeding trough and the discharging trough, the piezoelectric bimorph in the non-driven state can be used.

[0068] If it is necessary to isolate the feeding trough and the discharging trough and connect the feeding trough and the retracting trough, a preset direct current 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, as Figure 4 shown.

[0069] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms defined in general dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as here.

[0070] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A linear vibration feeding device driven by a sandwich piezoelectric actuator, characterized in that, It includes a base, first to fourth spring pieces, first to second connecting blocks, first to second piezoelectric transducers, first to second brackets, 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 transducer and the second piezoelectric transducer have the same structure, and both include 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 includes an end portion, an enlarged portion, and a root portion. Among them, both the end portion and the root portion are cylinders, 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 frustum of a 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 with a smaller area of the enlarged portion is coaxially fixed to one end of the end portion, and the end with a larger area is coaxially fixed to one end of the root portion; a threaded blind hole matching with the pre-tightening bolt is provided at the center of the end face of the root portion far from the enlarged portion; The rear beam is a cylinder with a cross-section having the same shape as the end face of the root portion of the front beam, and a countersunk through hole matching with the pre-tightening bolt is provided at the center of one end face of the rear beam; Both the first piezoelectric unit and the second piezoelectric unit include Q circular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the Q piezoelectric ceramic sheets are stacked in sequence, polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite; The clamping member includes a clamping portion and a fixing portion. The clamping portion has the same shape as the piezoelectric ceramic sheet, and the fixing portion is connected to the side wall of the clamping portion through a flexible hinge; The pre-tightening bolt sequentially passes through the rear beam, the first piezoelectric unit, the clamping portion of the clamping member, the second piezoelectric unit from the countersunk through hole of the rear beam and is threadedly connected to the threaded blind hole of the front beam, 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 Qth piezoelectric ceramic sheet of the first piezoelectric unit is opposite to the polarization direction of the first piezoelectric ceramic sheet of the second piezoelectric unit; The top plate is a rectangular plate; The first to fourth spring pieces are all rectangular spring pieces, and the first and second spring pieces have the same structure, and the third and fourth spring pieces have the same structure; The first and second spring pieces are arranged in parallel, and their lower ends are both fixed to the base, and their upper ends are respectively fixed to the first connecting block and the second connecting block; The third and fourth spring pieces are arranged in parallel, and their lower ends are respectively fixed to the first connecting block and the second connecting block, and their upper ends are respectively fixed to both ends of the top plate, making the top plate horizontally arranged, and the angle between the third spring piece and the horizontal plane is not equal to 90°; The end portion of the front beam of the first piezoelectric transducer is fixed to the first connecting block, and the fixing portion of the clamping member of the first piezoelectric transducer is fixed to the base through the first bracket; the end portion of the front beam of the second piezoelectric transducer is fixed to the second connecting block, and the fixing portion of the clamping member of the second piezoelectric transducer is fixed to the base through the second bracket; The axis of the rear beam of the first piezoelectric transducer is parallel to the axis of the rear beam of the second piezoelectric transducer; The adjusting bolt includes a nut and a stud; The upper surfaces of the first stop member, the second stop member, and the third stop member 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 stop member, the N adjusting grooves on the second stop member, and the P adjusting grooves on the third stop member; The M + N + P adjusting bolts pass through the M + N + P adjusting grooves one-to-one and are threadedly connected to the M + N + P positioning threaded blind holes one-to-one, fixing the first stop member, the second stop member, and the third stop member on the top plate, so that a feeding groove is formed between the first stop member and the second stop member, a discharging groove is formed between the first stop member and the third stop member, and a retracting groove is formed between the second stop member and the third stop member; 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 stop member, and the other end abuts against the second stop member, which is used to isolate 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 isolate the feeding groove and the discharging groove in the driving state so that the feeding groove and the retracting groove are connected.

2. The linear vibration feeding device with sandwich piezoelectric drive according to claim 1, characterized in that, A number of clamping keys are circumferentially provided on the front beams of the first piezoelectric transducer and the second piezoelectric transducer.

3. The linear vibration feeding device driven by a sandwich piezoelectric actuator according to claim 1, wherein Q takes 2.

4. The working method of the sandwich piezoelectric drive linear vibration feeding device according to claim 1, characterized in that It includes the following steps: If it is necessary to transport the material from the first piezoelectric transducer towards the second piezoelectric transducer, a sinusoidal alternating excitation signal U1 is applied to the first piezoelectric transducer, and a sinusoidal alternating excitation signal U2 is applied to the second piezoelectric transducer. The frequencies and voltages of U1 and U2 are the same and there is a 180° phase difference, exciting the first-order longitudinal vibration modes of the first and second piezoelectric transducers, and there is a 180° phase difference in the vibration modes; at this time, the vibrations of the first and second piezoelectric transducers are transmitted to the third and fourth spring sheets, inducing reciprocating bending vibrations of the third and fourth spring sheets, and then driving the top plate to generate horizontal and vertical displacements, so that the material is transported from the first piezoelectric transducer towards the second piezoelectric transducer; If it is necessary to isolate the feeding groove and the retracting groove and connect the feeding groove and the discharging groove, the piezoelectric bimorph in the non-driving state can be used; If it is necessary to isolate the feeding groove and the discharging groove and connect the feeding groove and the retracting groove, 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.

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