Linear feeding device and method based on piezoelectric transducer inertia drive

Abstract

The application discloses a kind of linear feeding device and method based on piezoelectric transducer inertia drive, feeding device includes base, first to fourth spring piece, first to second connecting block, piezoelectric transducer, top disc, piezoelectric bimorph, first to third stop piece, and M+N+P adjusting bolts;When working, sine excitation signal is applied to piezoelectric transducer, the second order longitudinal vibration mode of piezoelectric transducer can be excited, to induce the reciprocating bending vibration of spring piece, drive top disc to generate horizontal and vertical direction movement.Material placed in top disc moves forward and upward with top disc in material groove.When spring piece moves to limit position, elastic potential energy stored in spring piece drives top disc to move back, at this time, material continues to move forward and falls under the action of inertia in parabolic curve.Under this periodic motion, the transportation of material in top disc is realized.The application has simple structure, and is easy to process and assemble.

Description

Technical Field

[0001] This invention relates to the fields of piezoelectric feeders, material conveying, and microparticle transport, and particularly to a linear feeding device and method based on inertial drive of a piezoelectric transducer. Background Technology

[0002] Vibrating material conveying devices are commonly used feeding equipment in automated packaging. Their function is to form the alignment, sorting, and directional conveying of materials. They have important application value in production fields that require automated precision conveying, such as the testing and packaging of modern precision semiconductor devices, surface mount technology, and micro-machinery.

[0003] Vibrating material conveying devices can be classified into electromagnetic vibrating material conveying devices and piezoelectric vibrating material conveying devices according to their vibration excitation source. Feeding devices using electromagnets as the drive source are widely used in production lines; however, these electromagnetic vibrating feeders have drawbacks such as high noise levels, low energy conversion efficiency, and unsuitability for conveying precision materials. With the development of piezoelectric technology, novel actuators using piezoelectric materials as the drive source are attracting increasing attention from researchers.

[0004] The piezoelectric vibratory feeder, first proposed in 1977, utilizes rectangular piezoelectric ceramic plates as a driving source. It mainly consists of a base, a piezoelectric vibrator, spring plates, and a top plate. Its working principle is that when the piezoelectric vibrator is excited by an alternating excitation signal, the spring plates undergo reciprocating bending deformation under the excitation of the piezoelectric ceramic due to the inverse piezoelectric effect, inducing the top plate to produce elliptical motion, thereby conveying the material. However, due to the use of patch-type piezoelectric ceramic plates for excitation, the amplitude of this piezoelectric vibratory feeder is relatively small, resulting in poor conveying efficiency.

[0005] Currently, common piezoelectric feeding devices on the market add a mass block to the aforementioned piezoelectric vibratory feeder. The added inertia of the mass block increases the amplitude of the top plate, thereby improving the conveying efficiency. Since the patch-type piezoelectric vibratory feeder mainly utilizes the d31 effect of piezoelectric ceramics, and the d31 of piezoelectric ceramics is much smaller than d33, the efficiency of the patch-type piezoelectric vibratory feeder is lower than that of the sandwich-type piezoelectric vibratory feeder. Furthermore, the introduction of the mass block places higher demands on the processing and assembly of the device. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the deficiencies mentioned in the background art by providing a linear feeding device and method based on inertial drive of a piezoelectric transducer.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A linear feeding device based on inertial drive of a piezoelectric transducer includes a base, first to fourth spring plates, first to second connecting blocks, a piezoelectric transducer, a top plate, piezoelectric bicrystalline wafers, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1.

[0009] The piezoelectric transducer includes a front beam, a middle beam, a rear beam, a first piezoelectric unit, a second piezoelectric unit, a first preload bolt, and a second preload bolt;

[0010] The front beam and rear beam have the same structure, each including an end, an enlarged section, and a root. The end and root are both cylinders, and the area of ​​the end face is smaller than that of the root face. The enlarged section is a frustum with one end face shape the same as the end face shape and the other end face shape the same as the root face shape. The end with the smaller area of ​​the enlarged section is coaxially fixed to one end of the end face, and the end with the larger area is coaxially fixed to one end of the root. The center of the end face of the other end has a countersunk hole that penetrates the end, the enlarged section, and the root along its axis.

[0011] The middle beam is a cylinder with the same cross-section and root end face shape as the front beam, and pre-tightened threaded blind holes are provided at the center of both end faces of the middle beam;

[0012] The first piezoelectric unit and the second piezoelectric unit have the same structure, each containing 2Q annular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the 2Q annular piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and adjacent piezoelectric ceramic sheets have opposite polarization directions;

[0013] The first preload bolt passes through the countersunk hole of the front beam, through the front beam and the first piezoelectric unit in sequence, and is threaded to the preload thread blind hole at one end of the middle beam, clamping the front beam, the first piezoelectric unit, and the middle beam to make them coaxial; the second preload bolt passes through the countersunk hole of the rear beam, through the rear beam and the second piezoelectric unit in sequence, and is threaded to the preload thread blind hole at the other end of the middle beam, clamping the rear beam, the second piezoelectric unit, and the middle beam to make them coaxial.

[0014] The top plate is a rectangular plate;

[0015] The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure.

[0016] The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively.

[0017] The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°.

[0018] The ends of the front beam and rear beam of the piezoelectric transducer are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length.

[0019] The adjusting bolt includes a nut and a stud;

[0020] The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt.

[0021] The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop;

[0022] 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle.

[0023] One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

[0024] As a further optimization of the linear feeding device based on the inertial drive of the piezoelectric transducer of the present invention, the front beam, middle beam and rear beam are all provided with a number of keys for clamping in the circumferential direction.

[0025] As a further optimization of the linear feeding device based on piezoelectric transducer inertial drive of the present invention, Q is set to 1.

[0026] The present invention also discloses a method for operating the linear feeding device based on piezoelectric transducer inertial drive, comprising the following steps:

[0027] The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, a preset frequency simple harmonic excitation signal is applied to all piezoelectric ceramic plates in the first and second piezoelectric units of the piezoelectric transducer to excite the second-order longitudinal vibration mode of the piezoelectric transducer. The piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates. Since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate moves horizontally and vertically under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported from the feeding chute to the discharge chute or the return chute in the top plate.

[0028] If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued.

[0029] If the feed trough and discharge trough need to be isolated, the feed trough and return trough can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to make it bend.

[0030] The present invention also discloses another linear feeding device based on the inertial drive of a piezoelectric transducer, comprising a base, first to fourth spring plates, first to second connecting blocks, a piezoelectric transducer, a top plate, a piezoelectric bicrystalline wafer, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1.

[0031] The piezoelectric transducer comprises a beam, a first piezoelectric unit, and a second piezoelectric unit;

[0032] The beam includes a vibrating section, a first enlarged section, a second enlarged section, a first end, and a second end. The first and second ends have identical structures, both being cylinders. The vibrating section is a cylinder with a cross-sectional diameter larger than that of the first end. The first and second enlarged sections have identical structures, both being frustums of a cone, with the diameter of the end face with the smaller area equal to the diameter of the cross-section of the first end, and the diameter of the end face with the larger area equal to the diameter of the cross-section of the vibrating section. The end of the first enlarged section with the smaller area is coaxially fixed to one end of the first end, and the end with the larger area is coaxially fixed to one end of the vibrating section. The end of the second enlarged section with the smaller area is coaxially fixed to one end of the second end, and the end with the larger area is coaxially fixed to the other end of the vibrating section.

[0033] Both the first piezoelectric unit and the second piezoelectric unit contain Q piezoelectric ceramic sheets. The Q piezoelectric ceramic sheets in the first piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the first enlarged section. The Q piezoelectric ceramic sheets in the second piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the second enlarged section. The Q piezoelectric ceramic sheets in the first piezoelectric unit and the Q piezoelectric ceramic sheets in the second piezoelectric unit are symmetrically corresponding to each other.

[0034] The piezoelectric ceramic sheets in the first and second piezoelectric units are polarized along the thickness direction, and the polarization direction is either outward or inward.

[0035] The top plate is a rectangular plate;

[0036] The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure.

[0037] The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively.

[0038] The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°.

[0039] The two ends of the piezoelectric transducer beam are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length.

[0040] The adjusting bolt includes a nut and a stud;

[0041] The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt.

[0042] The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop;

[0043] 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle.

[0044] One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

[0045] As a further optimization of the linear feeding device based on the inertial drive of the piezoelectric transducer, a number of clamping keys are uniformly arranged circumferentially on the side wall of the beam vibration section.

[0046] As a further optimization of the linear feeding device based on the inertial drive of the piezoelectric transducer, the piezoelectric ceramic sheets in the first and second piezoelectric units are both bonded to the side wall of the vibrating part of the beam with epoxy resin adhesive.

[0047] The cross-sections of the feeding trough, discharging trough, and return trough can be set as rectangles or isosceles trapezoids with a lower base length greater than the upper base length.

[0048] This invention also discloses a method for operating the linear feeding device based on piezoelectric transducer inertial drive, comprising the following steps:

[0049] The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, a simple harmonic excitation signal with a preset frequency threshold is applied to all piezoelectric ceramic plates in the first and second piezoelectric units of the piezoelectric transducer, exciting the second-order longitudinal vibration mode of the piezoelectric transducer. The piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates. Since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate moves horizontally and vertically under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported from the feeding chute to the discharge chute or the return chute in the top plate.

[0050] If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued.

[0051] If the feed trough and discharge trough need to be isolated, the feed trough and return trough can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to make it bend.

[0052] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0053] 1. Simple structure and easy design, which can reduce the cost of material conveying devices;

[0054] 2. The structure combining piezoelectric transducers and mass blocks can improve the amplitude of the vibrating feeder and increase the material conveying efficiency.

[0055] 3. Using piezoelectric bicrystalline wafers as the screening device, the fast start-up characteristic of piezoelectric ceramics, combined with an image recognition system, can improve screening efficiency, realize an integrated structure for conveying and screening, and simplify the structure;

[0056] 4. The positions of the first to third stops can be adjusted by adjusting the bolts, thereby adjusting the width of the feeding chute, the discharge chute, and the return chute. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of the present invention;

[0058] Figure 2 This is a schematic diagram of the piezoelectric transducer in this invention;

[0059] Figure 3 This is a cross-sectional schematic diagram of the piezoelectric transducer in this invention;

[0060] Figure 4 This is a schematic diagram of applying an electrical signal to a piezoelectric transducer in this invention;

[0061] Figure 5 This is a schematic diagram of the workflow of the present invention;

[0062] Figure 6 This is a schematic diagram comparing the states of the piezoelectric transducer when it is not driven and when it is driven in this invention;

[0063] Figure 7 This is another structural schematic diagram of the present invention;

[0064] Figure 8 This is a schematic diagram of the piezoelectric transducer applying an electrical signal in another structure of the present invention.

[0065] In the diagram, 1-base, 2-first spring plate, 3-second spring plate, 4-third spring plate, 5-fourth spring plate, 6-first connecting block, 7-second connecting block, 8-piezoelectric transducer, 9-top plate, 10-first stop, 11-second stop, 12-third stop, 13-adjusting bolt, 14-piezoelectric bicrystalline wafer, 15-end of front beam, 16-end of rear beam, 17-enlarged part of front beam, 18-enlarged part of rear beam, 19-first piezoelectric unit, 20-second piezoelectric unit, 21-middle beam, 22-key on middle beam. Detailed Implementation

[0066] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0067] This invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully express the scope of the invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0068] 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 one another. Therefore, the first element, component, and / or part discussed below may be a second element, component, or part without departing from the teachings of this invention.

[0069] like Figure 1 As shown, the present invention discloses a linear feeding device based on the inertial drive of a piezoelectric transducer, comprising a base, first to fourth spring plates, first to second connecting blocks, a piezoelectric transducer, a top plate, a piezoelectric bicrystalline wafer, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1.

[0070] like Figure 2 As shown, the piezoelectric transducer includes a front beam, a middle beam, a rear beam, a first piezoelectric unit, a second piezoelectric unit, a first preload bolt, and a second preload bolt;

[0071] The front beam and rear beam have the same structure, each including an end, an enlarged section, and a root. The end and root are both cylinders, and the area of ​​the end face is smaller than that of the root face. The enlarged section is a frustum with one end face shape the same as the end face shape and the other end face shape the same as the root face shape. The end with the smaller area of ​​the enlarged section is coaxially fixed to one end of the end face, and the end with the larger area is coaxially fixed to one end of the root. The center of the end face of the other end has a countersunk hole that penetrates the end, the enlarged section, and the root along its axis.

[0072] The middle beam is a cylinder with the same cross-section and root end face shape as the front beam, and pre-tightened threaded blind holes are provided at the center of both end faces of the middle beam;

[0073] The first piezoelectric unit and the second piezoelectric unit have the same structure, each containing 2Q annular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the 2Q annular piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and adjacent piezoelectric ceramic sheets have opposite polarization directions;

[0074] The first preload bolt passes through the countersunk hole of the front beam, sequentially through the front beam and the first piezoelectric unit, and then threadedly connects to the preload threaded blind hole at one end of the middle beam, clamping the front beam, the first piezoelectric unit, and the middle beam to make them coaxial. The second preload bolt passes through the countersunk hole of the rear beam, sequentially through the rear beam and the second piezoelectric unit, and then threadedly connects to the preload threaded blind hole at the other end of the middle beam, clamping the rear beam, the second piezoelectric unit, and the middle beam to make them coaxial. Figure 3 As shown;

[0075] The top plate is a rectangular plate;

[0076] The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure.

[0077] The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively.

[0078] The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°.

[0079] The ends of the front beam and rear beam of the piezoelectric transducer are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length.

[0080] The adjusting bolt includes a nut and a stud;

[0081] The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt.

[0082] The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop;

[0083] 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle.

[0084] One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

[0085] The front beam, middle beam, and rear beam are all provided with several keys for clamping in the circumferential direction.

[0086] The preferred value for Q is 1.

[0087] The present invention also discloses a method for operating the linear feeding device based on piezoelectric transducer inertial drive, comprising the following steps:

[0088] The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, such as... Figure 4 As shown, a preset frequency harmonic excitation signal is applied to all piezoelectric ceramic plates in the first and second piezoelectric units of the piezoelectric transducer, exciting the second-order longitudinal vibration mode of the piezoelectric transducer; the piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates; since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate moves horizontally and vertically under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported in the top plate from the feeding chute to the discharge chute or the return chute, as shown. Figure 5 As shown;

[0089] If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued.

[0090] If isolation between the feed chute and the discharge chute is required, the feed chute and the return chute can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to bend it. Figure 6 As shown.

[0091] like Figure 7 As shown, the present invention also discloses another linear feeding device based on the inertial drive of a piezoelectric transducer, comprising a base, first to fourth spring plates, first to second connecting blocks, a piezoelectric transducer, a top plate, a piezoelectric bicrystalline wafer, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1.

[0092] The piezoelectric transducer comprises a beam, a first piezoelectric unit, and a second piezoelectric unit;

[0093] The beam includes a vibrating section, a first enlarged section, a second enlarged section, a first end, and a second end. The first and second ends have identical structures, both being cylinders. The vibrating section is a cylinder with a cross-sectional diameter larger than that of the first end. The first and second enlarged sections have identical structures, both being frustums of a cone, with the diameter of the end face with the smaller area equal to the diameter of the cross-section of the first end, and the diameter of the end face with the larger area equal to the diameter of the cross-section of the vibrating section. The end of the first enlarged section with the smaller area is coaxially fixed to one end of the first end, and the end with the larger area is coaxially fixed to one end of the vibrating section. The end of the second enlarged section with the smaller area is coaxially fixed to one end of the second end, and the end with the larger area is coaxially fixed to the other end of the vibrating section.

[0094] Both the first piezoelectric unit and the second piezoelectric unit contain Q piezoelectric ceramic sheets. The Q piezoelectric ceramic sheets in the first piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the first enlarged section. The Q piezoelectric ceramic sheets in the second piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the second enlarged section. The Q piezoelectric ceramic sheets in the first piezoelectric unit and the Q piezoelectric ceramic sheets in the second piezoelectric unit are symmetrically corresponding to each other.

[0095] The piezoelectric ceramic sheets in the first and second piezoelectric units are polarized along the thickness direction, and the polarization direction is either outward or inward.

[0096] The top plate is a rectangular plate;

[0097] The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure.

[0098] The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively.

[0099] The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°.

[0100] The two ends of the piezoelectric transducer beam are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length.

[0101] The adjusting bolt includes a nut and a stud;

[0102] The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt.

[0103] The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop;

[0104] 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle.

[0105] One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

[0106] As a further optimization of the linear feeding device based on the inertial drive of the piezoelectric transducer, a number of clamping keys are uniformly arranged circumferentially on the side wall of the beam vibration section.

[0107] As a further optimization of the linear feeding device based on the inertial drive of the piezoelectric transducer, the piezoelectric ceramic sheets in the first and second piezoelectric units are both bonded to the side wall of the vibrating part of the beam with epoxy resin adhesive.

[0108] This invention also discloses a method for operating the linear feeding device based on piezoelectric transducer inertial drive, comprising the following steps:

[0109] The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, such as... Figure 8As shown, a simple harmonic excitation signal with a preset frequency threshold is applied to all piezoelectric ceramic plates in the first and second piezoelectric units of the piezoelectric transducer to excite the second-order longitudinal vibration mode of the piezoelectric transducer; the piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates; since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate generates horizontal and vertical movements under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported in the top plate from the feeding chute to the discharge chute or the return chute;

[0110] If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued.

[0111] If the feed trough and discharge trough need to be isolated, the feed trough and return trough can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to make it bend.

[0112] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0113] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment 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 within the protection scope of the present invention.

Claims

1. A linear feeding device based on piezoelectric transducer inertial drive, characterized in that, It includes a base, first to fourth spring plates, first to second connecting blocks, piezoelectric transducer, top plate, piezoelectric bicrystalline wafer, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1; The piezoelectric transducer includes a front beam, a middle beam, a rear beam, a first piezoelectric unit, a second piezoelectric unit, a first preload bolt, and a second preload bolt; The front beam and rear beam have the same structure, each including an end, an enlarged section, and a root. The end and root are both cylinders, and the area of ​​the end face is smaller than that of the root face. The enlarged section is a frustum with one end face shape the same as the end face shape and the other end face shape the same as the root face shape. The end with the smaller area of ​​the enlarged section is coaxially fixed to one end of the end face, and the end with the larger area is coaxially fixed to one end of the root. The center of the end face of the other end has a countersunk hole that penetrates the end, the enlarged section, and the root along its axis. The middle beam is a cylinder with the same cross-section and root end face shape as the front beam, and pre-tightened threaded blind holes are provided at the center of both end faces of the middle beam; The first piezoelectric unit and the second piezoelectric unit have the same structure, each containing 2Q annular piezoelectric ceramic sheets, where Q is a natural number greater than or equal to 1; the 2Q annular piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and adjacent piezoelectric ceramic sheets have opposite polarization directions; The first preload bolt passes through the countersunk hole of the front beam, through the front beam and the first piezoelectric unit in sequence, and is threaded to the preload thread blind hole at one end of the middle beam, clamping the front beam, the first piezoelectric unit, and the middle beam to make them coaxial; the second preload bolt passes through the countersunk hole of the rear beam, through the rear beam and the second piezoelectric unit in sequence, and is threaded to the preload thread blind hole at the other end of the middle beam, clamping the rear beam, the second piezoelectric unit, and the middle beam to make them coaxial. The top plate is a rectangular plate; The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure. The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively. The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°. The ends of the front beam and rear beam of the piezoelectric transducer are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length. The adjusting bolt includes a nut and a stud; The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt. The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop; 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle. One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

2. The linear feeding device based on piezoelectric transducer inertial drive according to claim 1, characterized in that, The front beam, middle beam, and rear beam are all provided with several keys for clamping in the circumferential direction.

3. The linear feeding device based on piezoelectric transducer inertial drive according to claim 1, characterized in that, Q is set to 1.

4. The working method of the linear feeding device based on piezoelectric transducer inertial drive according to claim 1, characterized in that, Includes the following steps: The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, a preset frequency simple harmonic excitation signal is applied to all piezoelectric ceramics in the first and second piezoelectric units of the piezoelectric transducer to excite the second-order longitudinal vibration mode of the piezoelectric transducer. The piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates. Since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate moves horizontally and vertically under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported from the feeding chute to the discharge chute or the return chute in the top plate. If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued. If the feed chute and discharge chute need to be isolated, the feed chute and return chute can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to make it bend.

5. A linear feeding device based on piezoelectric transducer inertial drive, characterized in that, It includes a base, first to fourth spring plates, first to second connecting blocks, piezoelectric transducer, top plate, piezoelectric bicrystalline wafer, first to third stop pieces, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1; The piezoelectric transducer comprises a beam, a first piezoelectric unit, and a second piezoelectric unit; The beam includes a vibrating section, a first enlarged section, a second enlarged section, a first end, and a second end. The first and second ends have identical structures, both being cylinders. The vibrating section is a cylinder with a cross-sectional diameter larger than that of the first end. The first and second enlarged sections have identical structures, both being frustums of a cone, with the diameter of the end face with the smaller area equal to the diameter of the cross-section of the first end, and the diameter of the end face with the larger area equal to the diameter of the cross-section of the vibrating section. The end of the first enlarged section with the smaller area is coaxially fixed to one end of the first end, and the end with the larger area is coaxially fixed to one end of the vibrating section. The end of the second enlarged section with the smaller area is coaxially fixed to one end of the second end, and the end with the larger area is coaxially fixed to the other end of the vibrating section. Both the first piezoelectric unit and the second piezoelectric unit contain Q piezoelectric ceramic sheets. The Q piezoelectric ceramic sheets in the first piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the first enlarged section. The Q piezoelectric ceramic sheets in the second piezoelectric unit are circumferentially and uniformly arranged on the side wall of the beam vibration section near the second enlarged section. The Q piezoelectric ceramic sheets in the first piezoelectric unit and the Q piezoelectric ceramic sheets in the second piezoelectric unit are symmetrically corresponding to each other. The piezoelectric ceramic sheets in the first and second piezoelectric units are polarized along the thickness direction, and the polarization direction is either outward or inward. The top plate is a rectangular plate; The first to fourth spring sheets are all rectangular spring sheets. The first and second spring sheets have the same structure, and the third and fourth spring sheets have the same structure. The first and second spring sheets are arranged in parallel, with their lower ends fixedly connected to the base and their upper ends fixedly connected to the first connecting block and the second connecting block, respectively. The third and fourth spring plates are arranged in parallel, with their lower ends fixed to the first connecting block and the second connecting block, respectively, and their upper ends fixed to both ends of the top plate, so that the top plate is set horizontally and the angle between the third spring plate and the horizontal plane is not equal to 90°. The two ends of the piezoelectric transducer beam are respectively fixed to the first connecting block and the second connecting block, and the axis of the piezoelectric transducer is parallel to the side of the top plate along its length. The adjusting bolt includes a nut and a stud; The upper surfaces of the first stop, the second stop, and the third stop are respectively provided with M, N, and P adjustment grooves. Each adjustment groove is a strip-shaped groove perpendicular to the top plate, and each adjustment groove is provided with a strip-shaped through groove perpendicular to the top plate. The width of the adjustment groove is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped through groove is less than the diameter of the nut of the adjustment bolt but greater than the diameter of the stud of the adjustment bolt. The top plate has M+N+P positioning thread blind holes corresponding to the M adjustment grooves on the first stop, N on the second stop, and P on the third stop; 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, the second stop, and the third stop on the top plate. This forms a feeding groove between the first and second stops, a discharge groove between the first and third stops, and a return groove between the second and third stops. The included angle between the return groove and the discharge groove is an acute angle. One end of the piezoelectric bicrystalline wafer is fixedly connected to the third stop, and the other end abuts against the second stop. It is used to isolate the feed chute and the return chute in the non-drive state so that the feed chute and the discharge chute are connected, and to isolate the feed chute and the discharge chute in the drive state so that the feed chute and the return chute are connected.

6. The linear feeding device based on piezoelectric transducer inertial drive according to claim 5, characterized in that, The sidewall of the vibrating section of the beam is uniformly provided with several keys for clamping in the circumferential direction.

7. The linear feeding device based on piezoelectric transducer inertial drive according to claim 5, characterized in that, The piezoelectric ceramic sheets in the first and second piezoelectric units are both bonded to the sidewall of the vibrating part of the beam using epoxy resin adhesive.

8. The working method of the linear feeding device based on piezoelectric transducer inertial drive as described in claim 5, characterized in that, Includes the following steps: The feeding chute is positioned between the third spring plate and the discharge chute. If material needs to be transported from the feeding chute to the discharge chute or the return chute, a simple harmonic excitation signal with a preset frequency threshold is applied to all piezoelectric ceramic plates in the first and second piezoelectric units of the piezoelectric transducer, exciting the second-order longitudinal vibration mode of the piezoelectric transducer. The piezoelectric transducer transmits the vibration to the third and fourth spring plates through the connecting block, inducing the bending vibration of the third and fourth spring plates. Since the angle between the third and fourth spring plates and the horizontal plane is not 90°, the top plate moves horizontally and vertically under the bending vibration of the third and fourth spring plates, thereby driving the material to be transported from the feeding chute to the discharge chute or the return chute in the top plate. If isolation between the feed chute and the return chute is required, the feed chute and the discharge chute can be connected, and the piezoelectric dual crystal can be discontinued. If the feed trough and discharge trough need to be isolated, the feed trough and return trough can be connected. A preset DC signal can be input to the piezoelectric bicrystalline wafer to make it bend.

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