CN115724135A - In-plane traveling wave type linear feeding device and working method thereof - Google Patents

Abstract

The invention discloses an in-plane traveling wave linear feeding device and its working method. The device comprises a base, a first connecting piece, a second connecting piece, a front beam, a rear beam, a middle beam, first to fourth piezoelectric units, a first One to the second pre-tightening bolts, piezoelectric bimorphs, first to third stoppers, and M+N+P adjustment bolts; when working, apply a sinusoidal signal U1 to the first piezoelectric transducer, and apply a sinusoidal signal U1 to the second piezoelectric transducer. The piezoelectric transducer applies a sinusoidal signal U2, U1, U2 have the same frequency and voltage with a phase difference of π/4, and excite the longitudinal vibration modes of the first piezoelectric transducer and the second piezoelectric transducer. The superposition of longitudinal vibrations with a phase difference of π/4 induces the traveling wave mode of the center beam; under the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam Driven by the frictional force of the elliptical motion of each particle, it moves in the direction of traveling wave propagation; adjusting the phase difference of U1 and U2 to ‑π/4 can realize the reverse transportation of materials. The invention has simple structure and high transportation stability.

Description

An in-plane traveling wave type linear feeding device and its working method

technical field

The invention relates to the field of piezoelectric feeder, material conveying and micro particle conveying, in particular to an in-plane traveling wave linear feeding device and its working method.

Background technique

Vibrating feeding equipment is a commonly used equipment in automatic packaging. Its function is to form the alignment, sorting and directional transportation of materials. It plays an important role in the production fields that require automatic precision transportation such as the testing and sealing of modern precision semiconductor devices and micro mechanical transportation. Value.

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, but this electromagnetic vibrating feeder has disadvantages such as high noise, low energy conversion rate, and not suitable for precision material transportation. With the development of piezoelectric technology, new drivers using piezoelectric materials as driving sources have attracted more and more attention from researchers.

In 1977, the researchers of Japan Special Ceramics Co., Ltd. first proposed a piezoelectric vibrating feeder using a rectangular piezoelectric ceramic sheet as a driving source. Its working principle is that when the piezoelectric vibrator is excited by the alternating excitation signal, due to the inverse piezoelectric effect, the spring piece will produce reciprocating bending deformation under the excitation of piezoelectric ceramics, and induce the top plate to produce elliptical motion, thereby conveying materials.

At present, the linear piezoelectric feeder that is common on the market is based on the above-mentioned piezoelectric vibrating feeder with a mass block, and the vibration amplitude of the top plate is increased through the additional inertia of the mass block, thereby improving the conveying effect. When the inertial mass block is not added, the vibration amplitude is small because the piezoelectric coefficient of the patch piezoelectric transducer is not high. After adding the inertia mass block, the vibration amplitude is improved, but the instability of material transportation is also increased. At the same time, due to structural reasons, the above-mentioned piezoelectric vibrating feeder can only realize one-way transportation of materials.

Contents of the invention

The technical problem to be solved by the present invention is to provide an in-plane traveling wave linear feeding device and its working method for the defects involved in the background technology.

The present invention adopts the following technical solutions for solving the problems of the technologies described above:

An in-plane traveling wave linear feeding device, comprising a base, a first connecting piece, a second connecting piece, a front beam, a rear beam, a middle beam, first to fourth piezoelectric units, first to second pre-tightening bolts, compression The electric double chip, the first to the third stoppers, and M+N+P adjusting bolts, M, N, and P are all natural numbers greater than or equal to 1;

The middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam and the rear beam have the same structure, both are cuboids with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face;

The first to fourth piezoelectric units have the same structure, and all include Q piezoelectric ceramic sheets, and Q is a natural number greater than or equal to 1; the piezoelectric ceramic sheets and the center beam have the same cross-sectional shape, and a central Through holes; the Q piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolts pass through the front beam, the first piezoelectric unit, the through hole on the first connecting piece, the thread behind the second piezoelectric unit and the thread at one end of the middle beam from the countersunk through hole of the front beam. The blind holes are screwed together, and the front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, and the middle beam are clamped so that the front beam, the first piezoelectric unit, the second piezoelectric unit, and the middle beam are at the same time. shaft; the second pre-tightening bolt passes through the countersunk through hole of the back beam in turn through the back beam, the third piezoelectric unit, the through hole on the second connecting piece, behind the fourth piezoelectric unit and the other end of the middle beam The threaded blind holes are connected by threads, and the back beam, the third piezoelectric unit, the second connecting piece, the fourth piezoelectric unit, and the middle beam are clamped so that the back beam, the third piezoelectric unit, the fourth piezoelectric unit, and the middle beam are at the same time axis;

The polarization direction of the Qth piezoelectric ceramic sheet in the first piezoelectric unit is opposite to that of the first piezoelectric ceramic sheet in the second piezoelectric unit, and the Qth piezoelectric ceramic sheet in the third piezoelectric unit The polarization direction of the ceramic sheet is opposite to that of the first piezoelectric ceramic sheet in the fourth piezoelectric unit;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

As a further optimization scheme of the in-plane traveling wave linear feeding device of the present invention, the Q is 2.

The invention also discloses a working method of the in-plane traveling wave type linear feeding device, which includes the following steps:

The front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, the middle beam, and the first pre-tightening bolt form the first piezoelectric transducer, and the rear beam, the third piezoelectric unit, and the second The connecting piece, the fourth piezoelectric unit, the center beam, and the second pre-tightening bolt form the second piezoelectric transducer;

If the material needs to be transported from the first piezoelectric transducer to the second piezoelectric transducer, the sinusoidal signal U1 is applied to the first piezoelectric transducer, and the sinusoidal signal U2, U1, U2 is applied to the second piezoelectric transducer The frequency and voltage are the same and the phase difference of π/4 excites the longitudinal vibration mode of the first piezoelectric transducer and the second piezoelectric transducer, and the longitudinal vibration superposition of the two phases with a difference of π/4 phase difference induces The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle to the traveling wave propagation direction movement;

If the material needs to be transported in reverse, adjust the phase difference between U1 and U2 to -π/4;

If it is necessary to block the feeding chute and the retracting chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend.

The invention also discloses a third in-plane traveling wave type linear feeding device, which includes a base, a first connecting piece, a second connecting piece, a front beam, a rear beam, a middle beam, first to fourth piezoelectric ceramic sheets, first to The second pre-tightening bolt, the piezoelectric bimorph, the first to the third stoppers, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

The middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam and the rear beam have the same structure, both are cuboids with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolt passes through the through hole on the front beam and the first connecting piece successively from the countersunk through hole of the front beam, and is connected with the threaded blind hole at one end of the middle beam, and connects the front beam, the first connecting piece, The middle beam is clamped so that the front beam and the middle beam are coaxial; the second pre-tightening bolt passes through the countersunk through hole of the rear beam in turn, passes through the back beam, the through hole on the second connecting piece, and the thread at the other end of the middle beam The blind holes are connected by thread, and the back beam, the second connecting piece, and the middle beam are clamped so that the back beam and the middle beam are coaxial;

The first to fourth piezoelectric ceramic sheets have the same structure and are all polarized along the thickness direction, wherein the first and second piezoelectric ceramic sheets are symmetrically pasted on both sides of the front beam, and the third and fourth piezoelectric ceramic sheets are The ceramic sheets are pasted symmetrically on both sides of the back beam, and the first and third piezoelectric ceramic sheets are located on the same side;

The polarization directions of the first and second piezoelectric ceramic sheets are both inward or outward, and the polarization directions of the third and fourth piezoelectric ceramic sheets are both inward or outward;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

The invention also discloses the working method of the second in-plane traveling wave linear feeding device, which includes the following steps:

The front beam, the first connecting piece, the middle beam, the first preload screw, the first piezoelectric ceramic sheet, and the second piezoelectric ceramic sheet bolt form the first piezoelectric transducer, and the rear beam, the second connecting piece, The middle beam, the second pre-tightening bolt, the third piezoelectric ceramic sheet, and the fourth piezoelectric ceramic sheet form the second piezoelectric transducer;

If the material needs to be transported from the first piezoelectric transducer to the second piezoelectric transducer, the sinusoidal signal U1 is applied to the first piezoelectric transducer, and the sinusoidal signal U2, U1, U2 is applied to the second piezoelectric transducer The frequency and voltage are the same and the phase difference of π/4 excites the longitudinal vibration mode of the first piezoelectric transducer and the second piezoelectric transducer, and the longitudinal vibration superposition of the two phases with a difference of π/4 phase difference induces The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle to the traveling wave propagation direction movement;

If the material needs to be transported in reverse, adjust the phase difference between U1 and U2 to -π/4;

If it is necessary to block the feeding chute and the retracting chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend.

The invention also discloses a third in-plane traveling wave type linear feeding device, which includes a base, a first connecting piece, a second connecting piece, a front beam, a damping block, a middle beam, first to second piezoelectric units, first to second The second pre-tightening bolt, the piezoelectric bimorph, the first to the third stoppers, and M+N+P adjusting bolts, where M, N, and P are all natural numbers greater than or equal to 1;

The middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam is a cuboid with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face; the damping block is made of damping material, and a countersunk through hole is provided on it;

The first to second piezoelectric units have the same structure, and all include Q piezoelectric ceramic sheets, and Q is a natural number greater than or equal to 1; the piezoelectric ceramic sheets and the center beam have the same cross-sectional shape, and a central Through holes; the Q piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolts pass through the front beam, the first piezoelectric unit, the through hole on the first connecting piece, the thread behind the second piezoelectric unit and the thread at one end of the middle beam from the countersunk through hole of the front beam. The blind holes are screwed together, and the front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, and the middle beam are clamped so that the front beam, the first piezoelectric unit, the second piezoelectric unit, and the middle beam are at the same time. Shaft; the second pre-tightening bolt passes through the through hole of the damping block and the through hole on the second connecting piece in turn from the countersunk through hole of the damping block, and is connected with the threaded blind hole at the other end of the middle beam, and the damping block, the second 2. Clamping of the connecting piece and the middle beam;

The polarization direction of the Qth piezoelectric ceramic sheet in the first piezoelectric unit is opposite to that of the first piezoelectric ceramic sheet in the second piezoelectric unit;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle; the feed groove is located between the front beam and the discharge groove;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

The invention also discloses the working method of the third in-plane traveling wave linear feeding device, which includes the following steps:

The front beam, the first connecting piece, the middle beam, the first pre-tightening screw, the first piezoelectric unit, and the second piezoelectric unit form a piezoelectric transducer; Back slot transportation, apply a sinusoidal signal of preset frequency to the piezoelectric transducer, excite the longitudinal vibration mode of the piezoelectric transducer, the vibration propagates from the piezoelectric transducer to the damping material, and is absorbed by the damping material, inducing The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle. Movement in the direction of wave propagation;

If it is necessary to block the feeding chute and the retracting chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend.

Compared with the prior art, the present invention adopts the above technical scheme and has the following technical effects:

1. The piezoelectric transducer is used to excite the in-plane traveling wave mode of the center beam to drive the material transportation, which has the advantages of simple structure, easy control and low cost;

2. Using the in-plane traveling wave mode drive, compared with the out-of-plane vibration mode and inertial drive mode, it can realize more stable transportation of materials;

3. By changing the phase difference of the two-phase excitation signals, the propagation direction of the traveling wave mode can be changed, so as to realize the opposite direction of material propagation. Compared with the linear feeding device with multi-row arrangement to realize bidirectional movement, the structure is simplified.

Description of drawings

Fig. 1 is the structural representation of the first in-plane traveling wave type linear feeding device among the present invention;

Fig. 2 is a schematic diagram of the polarization directions of the first piezoelectric unit and the second piezoelectric unit in the present invention;

Fig. 3 is the simulation schematic diagram of the traveling wave mode of the first in-plane traveling wave type linear feeding device in the present invention;

Fig. 4 is a schematic diagram of the state comparison between the piezoelectric bimorph when it is not driven and when it is driven;

Fig. 5 is a schematic structural view of the second in-plane traveling wave type linear feeding device in the present invention;

Fig. 6 is a schematic structural view of the third in-plane traveling wave linear feeding device in the present invention.

In the figure, 1-base, 2-first connecting piece, 3-second connecting piece, 4-preload bolt, 5-front beam, 6-back beam, 7-first piezoelectric unit, 8-second piezoelectric unit Unit, 9-third piezoelectric unit, 10-fourth piezoelectric unit, 11-center beam, 12-first stopper, 13-second stopper, 14-third stopper, 15-adjusting bolt, 16 - Piezoelectric bimorph.

Detailed ways

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

It should be understood that although the terms first, second, third etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component and/or section from another. Thus, a first element, component and/or section discussed below could be termed a second element, component or section without departing from the teachings of the present invention.

In order to improve the conveying efficiency of the piezoelectric vibrating feeder, simplify the structure of the device, improve the stability of transportation, and realize the two-way transportation of materials, the present invention proposes an in-plane traveling wave linear feeding device and its working method. The device is driven by the in-plane traveling wave mode. Compared with the out-of-plane vibration mode and inertial drive mode, the vibration in the vertical direction is reduced and the transportation stability is improved. At the same time, by changing the phase difference, the propagation direction of the traveling wave can be changed, so as to realize the reverse transportation of materials.

As shown in Figure 1, the present invention discloses an in-plane traveling wave type linear feeding device, which includes a base, a first connecting piece, a second connecting piece, a front beam, a rear beam, a middle beam, first to fourth piezoelectric units, The first to second pre-tightening bolts, piezoelectric bimorphs, 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 middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam and the rear beam have the same structure, both are cuboids with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face;

The first to fourth piezoelectric units have the same structure, and all include Q piezoelectric ceramic sheets, and Q is a natural number greater than or equal to 1; the piezoelectric ceramic sheets and the center beam have the same cross-sectional shape, and a central Through holes; the Q piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolts pass through the front beam, the first piezoelectric unit, the through hole on the first connecting piece, the thread behind the second piezoelectric unit and the thread at one end of the middle beam from the countersunk through hole of the front beam. The blind holes are screwed together, and the front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, and the middle beam are clamped so that the front beam, the first piezoelectric unit, the second piezoelectric unit, and the middle beam are at the same time. shaft; the second pre-tightening bolt passes through the countersunk through hole of the back beam in turn through the back beam, the third piezoelectric unit, the through hole on the second connecting piece, behind the fourth piezoelectric unit and the other end of the middle beam The threaded blind holes are connected by threads, and the back beam, the third piezoelectric unit, the second connecting piece, the fourth piezoelectric unit, and the middle beam are clamped so that the back beam, the third piezoelectric unit, the fourth piezoelectric unit, and the middle beam are at the same time axis;

As shown in Figure 2, the polarization direction of the Qth piezoelectric ceramic sheet in the first piezoelectric unit is opposite to that of the first piezoelectric ceramic sheet in the second piezoelectric unit, and the third piezoelectric unit The polarization direction of the Qth piezoelectric ceramic sheet in the fourth piezoelectric unit is opposite to that of the first piezoelectric ceramic sheet;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

As a further optimization scheme of the in-plane traveling wave linear feeding device of the present invention, the Q is 2.

The invention also discloses a working method of the in-plane traveling wave type linear feeding device, which includes the following steps:

The front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, the middle beam, and the first pre-tightening bolt form the first piezoelectric transducer, and the rear beam, the third piezoelectric unit, and the second The connecting piece, the fourth piezoelectric unit, the center beam, and the second pre-tightening bolt form the second piezoelectric transducer;

If the material needs to be transported from the first piezoelectric transducer to the second piezoelectric transducer, the sinusoidal signal U1 is applied to the first piezoelectric transducer, and the sinusoidal signal U2, U1, U2 is applied to the second piezoelectric transducer The frequency and voltage are the same and the phase difference of π/4 excites the longitudinal vibration mode of the first piezoelectric transducer and the second piezoelectric transducer, and the longitudinal vibration superposition of the two phases with a difference of π/4 phase difference induces The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle to the traveling wave Propagation direction movement, as shown in Figure 3;

If the material needs to be transported in reverse, adjust the phase difference between U1 and U2 to -π/4;

If it is necessary to block the feeding chute and the retracting chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend, as shown in Figure 4.

As shown in Figure 5, the present invention also discloses a third in-plane traveling wave type linear feeding device, which includes a base, a first connecting piece, a second connecting piece, a front beam, a rear beam, a middle beam, first to fourth piezoelectric Ceramic sheet, first to second pre-tightening bolts, 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 middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam and the rear beam have the same structure, both are cuboids with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolt passes through the through hole on the front beam and the first connecting piece successively from the countersunk through hole of the front beam, and is connected with the threaded blind hole at one end of the middle beam, and connects the front beam, the first connecting piece, The middle beam is clamped so that the front beam and the middle beam are coaxial; the second pre-tightening bolt passes through the countersunk through hole of the rear beam in turn, passes through the back beam, the through hole on the second connecting piece, and the thread at the other end of the middle beam The blind holes are connected by thread, and the back beam, the second connecting piece, and the middle beam are clamped so that the back beam and the middle beam are coaxial;

The first to fourth piezoelectric ceramic sheets have the same structure and are all polarized along the thickness direction, wherein the first and second piezoelectric ceramic sheets are symmetrically pasted on both sides of the front beam, and the third and fourth piezoelectric ceramic sheets are The ceramic sheets are pasted symmetrically on both sides of the back beam, and the first and third piezoelectric ceramic sheets are located on the same side;

The polarization directions of the first and second piezoelectric ceramic sheets are both inward or outward, and the polarization directions of the third and fourth piezoelectric ceramic sheets are both inward or outward;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

The invention also discloses the working method of the second in-plane traveling wave linear feeding device, which includes the following steps:

The front beam, the first connecting piece, the middle beam, the first preload screw, the first piezoelectric ceramic sheet, and the second piezoelectric ceramic sheet bolt form the first piezoelectric transducer, and the rear beam, the second connecting piece, The middle beam, the second pre-tightening bolt, the third piezoelectric ceramic sheet, and the fourth piezoelectric ceramic sheet form the second piezoelectric transducer;

If the material needs to be transported from the first piezoelectric transducer to the second piezoelectric transducer, the sinusoidal signal U1 is applied to the first piezoelectric transducer, and the sinusoidal signal U2, U1, U2 is applied to the second piezoelectric transducer The frequency and voltage are the same and the phase difference of π/4 excites the longitudinal vibration mode of the first piezoelectric transducer and the second piezoelectric transducer, and the longitudinal vibration superposition of the two phases with a difference of π/4 phase difference induces The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle to the traveling wave propagation direction movement;

If the material needs to be transported in reverse, adjust the phase difference between U1 and U2 to -π/4;

If it is necessary to block the feeding chute and the retreating chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend.

As shown in Figure 6, the present invention also discloses a third type of in-plane traveling wave linear feeding device, which includes a base, a first connecting piece, a second connecting piece, a front beam, a damping block, a middle beam, first to second pressing Electric unit, first to second pre-tightening bolts, piezoelectric bimorph, first to third stoppers, and M+N+P adjustment bolts, where M, N, and P are all natural numbers greater than or equal to 1;

The middle beam is a cuboid, and the centers of both ends are provided with pre-tightened threaded blind holes;

The front beam is a cuboid with the same cross section as the middle beam, and a countersunk through hole is provided in the center of one end face; the damping block is made of damping material, and a countersunk through hole is provided on it;

The first to second piezoelectric units have the same structure, and all include Q piezoelectric ceramic sheets, and Q is a natural number greater than or equal to 1; the piezoelectric ceramic sheets and the center beam have the same cross-sectional shape, and a central Through holes; the Q piezoelectric ceramic sheets are stacked sequentially, all polarized along the thickness direction, and the polarization directions of adjacent piezoelectric ceramic sheets are opposite;

The first connecting piece and the second connecting piece have the same structure, both of which are rectangular sheet structures, are arranged vertically, the lower ends are fixedly connected to the base, and the upper ends are provided with through holes;

The first pre-tightening bolts pass through the front beam, the first piezoelectric unit, the through hole on the first connecting piece, the thread behind the second piezoelectric unit and the thread at one end of the middle beam from the countersunk through hole of the front beam. The blind holes are screwed together, and the front beam, the first piezoelectric unit, the first connecting piece, the second piezoelectric unit, and the middle beam are clamped so that the front beam, the first piezoelectric unit, the second piezoelectric unit, and the middle beam are at the same time. Shaft; the second pre-tightening bolt passes through the through hole of the damping block and the through hole on the second connecting piece in turn from the countersunk through hole of the damping block, and is connected with the threaded blind hole at the other end of the middle beam, and the damping block, the second 2. Clamping of the connecting piece and the middle beam;

The polarization direction of the Qth piezoelectric ceramic sheet in the first piezoelectric unit is opposite to that of the first piezoelectric ceramic sheet in the second piezoelectric unit;

The adjusting bolt includes a nut and a stud;

The upper surfaces of the first block, the second block, and the third block are respectively provided with M, N, and P adjustment grooves, and the adjustment grooves are strip-shaped grooves perpendicular to the middle beam , and the adjustment grooves are all provided with strip-shaped slots perpendicular to the center beam, the width of the adjustment slots is greater than the diameter of the nut of the adjustment bolt, and the width of the strip-shaped slot is smaller than the nut of the adjustment bolt diameter and greater than the diameter of the adjusting bolt stud;

The upper surface of the center beam is provided with M+N+P positioning threads corresponding to M on the first stopper, N on the second stopper, and P on the third stopper. Blind hole;

The M+N+P adjusting bolts pass through the M+N+P adjusting grooves one by one, and are connected to the M+N+P positioning threaded blind holes one by one, and the first gear The first stopper, the second stopper, and the third stopper are fixed on the middle beam, so that a feeding trough is formed between the first stopper and the second stopper, and a discharge trough is formed between the first stopper and the third stopper , a retreat groove is formed between the second stopper and the third stopper; the angle between the retreat groove and the discharge groove is an acute angle; the feed groove is located between the front beam and the discharge groove;

One end of the piezoelectric bimorph is fixedly connected to the third stopper, and the other end is opposed to the second stopper, which is used to block the feeding chute and the retreating chute in the non-driven state so that the feeding chute and the discharge chute Unicom, in the driving state, blocking the feeding chute and the discharging chute makes the feeding chute and the retreating chute connected.

The invention also discloses the working method of the third in-plane traveling wave linear feeding device, which includes the following steps:

The front beam, the first connecting piece, the middle beam, the first pre-tightening screw, the first piezoelectric unit, and the second piezoelectric unit form a piezoelectric transducer; Back slot transportation, apply a sinusoidal signal of preset frequency to the piezoelectric transducer, excite the longitudinal vibration mode of the piezoelectric transducer, the vibration propagates from the piezoelectric transducer to the damping material, and is absorbed by the damping material, inducing The traveling wave mode of the center beam; in the traveling wave mode, the vibration form of a single particle on the center beam is an elliptical motion, so that the material placed on the center beam is driven by the friction of the elliptical motion of each particle. Movement in the direction of wave propagation;

If it is necessary to block the feeding chute and the retracting chute, the feeding chute and the discharging chute should be connected without driving the piezoelectric bimorph;

If it is necessary to block the feed chute and the discharge chute, the feed chute and the retraction chute are connected, and a preset DC signal is input to the piezoelectric bimorph to make the piezoelectric bimorph bend.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein explain.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. An in-plane traveling wave type linear feeding device is characterized by comprising a base, a first connecting sheet, a second connecting sheet, a front beam, a rear beam, a middle beam, a first piezoelectric unit, a second piezoelectric unit, a third piezoelectric unit, a fourth piezoelectric unit, a first pretightening bolt, a second pretightening bolt, a piezoelectric bimorph, a first blocking piece, a second pretightening bolt, a third blocking piece and M + N + P adjusting bolts, wherein M, N, P are natural numbers which are more than or equal to 1;

the middle beam is a cuboid, and the centers of two ends of the middle beam are respectively provided with a pre-tightening threaded blind hole;

the front beam and the rear beam are of the same structure and are cuboids with the same cross section as that of the middle beam, and the center of one end face is provided with a countersunk through hole;

the first piezoelectric unit, the second piezoelectric unit, the third piezoelectric unit and the fourth piezoelectric unit have the same structure and comprise Q piezoelectric ceramic pieces, and Q is a natural number more than or equal to 1; the cross sections of the piezoelectric ceramic piece and the middle beam are the same in shape, and a through hole is formed in the center of the piezoelectric ceramic piece and the middle beam; the Q piezoelectric ceramic pieces are sequentially stacked and are polarized along the thickness direction, and the polarization directions of the adjacent piezoelectric ceramic pieces are opposite;

the first connecting sheet and the second connecting sheet have the same structure, are both rectangular sheet structures and are both vertically arranged, the lower ends of the first connecting sheet and the second connecting sheet are both fixedly connected with the base, and the upper ends of the first connecting sheet and the second connecting sheet are both provided with through holes;

the first pre-tightening bolt sequentially penetrates through the front beam, the first piezoelectric unit, the through hole in the first connecting sheet and the second piezoelectric unit from the countersunk head through hole of the front beam and is in threaded connection with the threaded blind hole at one end of the middle beam, the front beam, the first piezoelectric unit, the first connecting sheet, the second piezoelectric unit and the middle beam are clamped, and the front beam, the first piezoelectric unit, the second piezoelectric unit and the middle beam are coaxial; the second pre-tightening bolt sequentially penetrates through the through holes in the rear beam, the third piezoelectric unit, the second connecting sheet and the fourth piezoelectric unit from the countersunk head through hole of the rear beam and is in threaded connection with the threaded blind hole at the other end of the middle beam, the rear beam, the third piezoelectric unit, the second connecting sheet, the fourth piezoelectric unit and the middle beam are clamped, and the rear beam, the third piezoelectric unit, the fourth piezoelectric unit and the middle beam are coaxial;

the polarization direction of the Q-th piezoelectric ceramic piece in the first piezoelectric unit is opposite to that of the 1 st piezoelectric ceramic piece in the second piezoelectric unit, and the polarization direction of the Q-th piezoelectric ceramic piece in the third piezoelectric unit is opposite to that of the 1 st piezoelectric ceramic piece in the fourth piezoelectric unit;

the adjusting bolt comprises a nut and a stud;

the upper surfaces of the first blocking piece, the second blocking piece and the third blocking piece are respectively provided with M, N and P adjusting grooves, the adjusting grooves are strip-shaped grooves perpendicular to the middle beam, strip-shaped through grooves perpendicular to the middle beam are formed in the adjusting grooves, the width of each adjusting groove is larger than the diameter of a nut of the adjusting bolt, and the width of each strip-shaped through groove is smaller than the diameter of the nut of the adjusting bolt and larger than the diameter of a stud of the adjusting bolt;

m + N + P positioning threaded blind holes which correspond to M adjusting grooves in the first stopper, N adjusting grooves in the second stopper and P adjusting grooves in the third stopper one by one are formed in the upper surface of the middle beam;

the M + N + P adjusting bolts penetrate through the M + N + P adjusting grooves in a one-to-one corresponding mode and are in threaded connection with the M + N + P positioning threaded blind holes in a one-to-one corresponding mode, the first blocking piece, the second blocking piece and the third blocking piece are fixed on the middle beam, a feeding groove is formed between the first blocking piece and the second blocking piece, a discharging groove is formed between the first blocking piece and the third blocking piece, and a returning groove is formed between the second blocking piece and the third blocking piece; an included angle between the backspacing groove and the discharge groove is an acute angle;

one end of the piezoelectric bimorph is fixedly connected with the third retaining piece, and the other end of the piezoelectric bimorph abuts against the second retaining piece and is used for isolating the feed chute and the backspacing chute under the non-driving state to enable the feed chute to be communicated with the discharge chute, and isolating the feed chute and the discharge chute under the driving state to enable the feed chute to be communicated with the backspacing chute.

2. The in-plane traveling wave type linear feeder according to claim 1, wherein Q is 2.

3. The operating method of an in-plane traveling wave type linear feeder according to claim 1, comprising the steps of:

the front beam, the first piezoelectric unit, the first connecting sheet, the second piezoelectric unit, the middle beam and the first pre-tightening bolt form a first piezoelectric transducer, and the rear beam, the third piezoelectric unit, the second connecting sheet, the fourth piezoelectric unit, the middle beam and the second pre-tightening bolt form a second piezoelectric transducer;

if the materials are needed to be transported from the first piezoelectric transducer to the second piezoelectric transducer, applying a sinusoidal signal U1 to the first piezoelectric transducer, applying a sinusoidal signal U2 to the second piezoelectric transducer, wherein the frequencies and the voltages of the U1 and the U2 are the same and have a phase difference of pi/4, exciting longitudinal vibration modes of the first piezoelectric transducer and the second piezoelectric transducer, and inducing a traveling wave mode of the middle beam by superposing longitudinal vibrations of the two phases with the phase difference of pi/4; under the traveling wave mode, the vibration mode of a single mass point on the middle beam is represented as elliptical motion, so that materials placed on the middle beam move towards the traveling wave propagation direction under the driving of the friction force of the elliptical motion of each mass point;

if the materials need to be transported reversely, the phase difference between U1 and U2 is adjusted to-pi/4;

if the feeding groove and the backspacing groove need to be isolated, the feeding groove is communicated with the discharging groove, and the piezoelectric bimorph is not driven;

if the feed chute and the discharge chute are required to be isolated, the feed chute is communicated with the backspacing chute, and a preset direct current signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph can be bent.

4. An in-plane traveling wave type linear feeding device is characterized by comprising a base, a first connecting sheet, a second connecting sheet, a front beam, a rear beam, a middle beam, first to fourth piezoelectric ceramic sheets, first to second pre-tightening bolts, a piezoelectric bimorph, first to third stoppers and M + N + P adjusting bolts, wherein M, N, P are natural numbers which are more than or equal to 1;

the middle beam is a cuboid, and the centers of two ends of the middle beam are respectively provided with a pre-tightening threaded blind hole;

the front beam and the rear beam are of the same structure and are cuboids with the same cross section as the cross section of the middle beam, and the center of one end face is provided with a countersunk through hole;

the first connecting sheet and the second connecting sheet have the same structure, are both rectangular sheet structures and are both vertically arranged, the lower ends of the first connecting sheet and the second connecting sheet are both fixedly connected with the base, and the upper ends of the first connecting sheet and the second connecting sheet are both provided with through holes;

the first pre-tightening bolt sequentially penetrates through the through holes in the front beam and the first connecting piece from the countersunk through hole of the front beam and then is in threaded connection with the threaded blind hole at one end of the middle beam, so that the front beam, the first connecting piece and the middle beam are clamped and the front beam and the middle beam are coaxial; the second pre-tightening bolt sequentially penetrates through the through holes in the rear beam and the second connecting sheet from the countersunk through hole of the rear beam and then is in threaded connection with the threaded blind hole at the other end of the middle beam, and the rear beam, the second connecting sheet and the middle beam are clamped tightly to enable the rear beam and the middle beam to be coaxial;

the first piezoelectric ceramic pieces, the second piezoelectric ceramic pieces, the third piezoelectric ceramic pieces and the fourth piezoelectric ceramic pieces are of the same structure and are polarized along the thickness direction, wherein the first piezoelectric ceramic pieces and the second piezoelectric ceramic pieces are symmetrically adhered to two sides of the front beam, the third piezoelectric ceramic pieces and the fourth piezoelectric ceramic pieces are symmetrically adhered to two sides of the rear beam, and the first piezoelectric ceramic pieces and the third piezoelectric ceramic pieces are positioned on the same side;

the polarization directions of the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are both inward or outward, and the polarization directions of the third piezoelectric ceramic piece and the fourth piezoelectric ceramic piece are both inward or outward;

the adjusting bolt comprises 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 strip-shaped grooves vertical to the middle beam, the adjusting grooves are respectively provided with strip-shaped through grooves vertical to the middle beam, the width of each adjusting groove is larger than the diameter of a nut of the adjusting bolt, and the width of each strip-shaped through groove is smaller than the diameter of the nut of the adjusting bolt and larger than the diameter of a stud of the adjusting bolt;

m + N + P positioning threaded blind holes which correspond to M adjusting grooves on the first stopper, N adjusting grooves on the second stopper and P adjusting grooves on the third stopper one by one are arranged on the upper surface of the middle beam;

the M + N + P adjusting bolts penetrate through the M + N + P adjusting grooves in a one-to-one corresponding mode and are in threaded connection with the M + N + P positioning threaded blind holes in a one-to-one corresponding mode, the first blocking piece, the second blocking piece and the third blocking piece are fixed on the middle beam, a feeding groove is formed between the first blocking piece and the second blocking piece, a discharging groove is formed between the first blocking piece and the third blocking piece, and a returning groove is formed between the second blocking piece and the third blocking piece; an included angle between the backspacing groove and the discharge groove is an acute angle;

one end of the piezoelectric bimorph is fixedly connected with the third retaining piece, and the other end of the piezoelectric bimorph abuts against the second retaining piece and is used for isolating the feed chute and the backspacing chute under the non-driving state to enable the feed chute to be communicated with the discharge chute, and isolating the feed chute and the discharge chute under the driving state to enable the feed chute to be communicated with the backspacing chute.

5. The operating method of an in-plane traveling wave type linear feeder according to claim 4, comprising the steps of:

the front beam, the first connecting piece, the middle beam, the first pre-tightening screw, the first piezoelectric ceramic piece and the second piezoelectric ceramic piece bolt form a first piezoelectric transducer, and the rear beam, the second connecting piece, the middle beam, the second pre-tightening screw, the third piezoelectric ceramic piece and the fourth piezoelectric ceramic piece form a second piezoelectric transducer;

if the materials are needed to be transported from the first piezoelectric transducer to the second piezoelectric transducer, applying a sinusoidal signal U1 to the first piezoelectric transducer, applying a sinusoidal signal U2 to the second piezoelectric transducer, wherein the frequencies and the voltages of the U1 and the U2 are the same and have a phase difference of pi/4, exciting longitudinal vibration modes of the first piezoelectric transducer and the second piezoelectric transducer, and inducing a traveling wave mode of the middle beam by superposing longitudinal vibrations of the two phases with the phase difference of pi/4; under the traveling wave mode, the vibration mode of a single mass point on the middle beam is represented as elliptical motion, so that materials placed on the middle beam move towards the traveling wave propagation direction under the driving of the friction force of the elliptical motion of each mass point;

if the materials need to be transported reversely, the phase difference between U1 and U2 is adjusted to-pi/4;

if the feed chute and the backspacing chute need to be isolated, the feed chute is communicated with the discharge chute without driving the piezoelectric bimorph;

if the feeding groove and the discharging groove are required to be isolated, the feeding groove is communicated with the backspacing groove, and a preset direct current signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph can be bent.

6. An in-plane traveling wave type linear feeding device is characterized by comprising a base, a first connecting sheet, a second connecting sheet, a front beam, a damping block, a middle beam, a first piezoelectric unit, a second piezoelectric unit, a first pretightening bolt, a second pretightening bolt, a piezoelectric bimorph, a first blocking piece, a second pretightening bolt, a third blocking piece and M + N + P adjusting bolts, wherein M, N, P are natural numbers which are more than or equal to 1;

the middle beam is a cuboid, and the centers of two ends of the middle beam are respectively provided with a pre-tightening threaded blind hole;

the front beam is a cuboid with the same cross section as the cross section of the middle beam, and a countersunk through hole is formed in the center of one end face; the damping block is made of damping materials and is provided with a countersunk through hole;

the first piezoelectric unit, the second piezoelectric unit and the third piezoelectric unit have the same structure and comprise Q piezoelectric ceramic pieces, wherein Q is a natural number more than or equal to 1; the cross sections of the piezoelectric ceramic piece and the middle beam are the same in shape, and a through hole is formed in the center of the piezoelectric ceramic piece and the middle beam; the Q piezoelectric ceramic pieces are sequentially stacked and polarized along the thickness direction, and the polarization directions of the adjacent piezoelectric ceramic pieces are opposite;

the first connecting sheet and the second connecting sheet have the same structure, are both rectangular sheet structures and are both vertically arranged, the lower ends of the first connecting sheet and the second connecting sheet are both fixedly connected with the base, and the upper ends of the first connecting sheet and the second connecting sheet are both provided with through holes;

the first pre-tightening bolt sequentially penetrates through the front beam, the first piezoelectric unit, the through hole in the first connecting sheet and the second piezoelectric unit from the countersunk head through hole of the front beam and is in threaded connection with the threaded blind hole at one end of the middle beam, the front beam, the first piezoelectric unit, the first connecting sheet, the second piezoelectric unit and the middle beam are clamped, and the front beam, the first piezoelectric unit, the second piezoelectric unit and the middle beam are coaxial; the second pre-tightening bolt sequentially penetrates through the damping block and the through hole in the second connecting sheet from the countersunk through hole of the damping block and then is in threaded connection with the threaded blind hole at the other end of the middle beam, so that the damping block, the second connecting sheet and the middle beam are clamped tightly;

the polarization direction of the Q-th piezoelectric ceramic piece in the first piezoelectric unit is opposite to that of the 1 st piezoelectric ceramic piece in the second piezoelectric unit;

the adjusting bolt comprises 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 strip-shaped grooves vertical to the middle beam, the adjusting grooves are respectively provided with strip-shaped through grooves vertical to the middle beam, the width of each adjusting groove is larger than the diameter of a nut of the adjusting bolt, and the width of each strip-shaped through groove is smaller than the diameter of the nut of the adjusting bolt and larger than the diameter of a stud of the adjusting bolt;

m + N + P positioning threaded blind holes which correspond to M adjusting grooves on the first stopper, N adjusting grooves on the second stopper and P adjusting grooves on the third stopper one by one are arranged on the upper surface of the middle beam;

the M + N + P adjusting bolts penetrate through the M + N + P adjusting grooves in a one-to-one corresponding mode and are in one-to-one corresponding threaded connection with the M + N + P positioning threaded blind holes, the first blocking piece, the second blocking piece and the third blocking piece are fixed on the middle beam, a feeding groove is formed between the first blocking piece and the second blocking piece, a discharging groove is formed between the first blocking piece and the third blocking piece, and a returning groove is formed between the second blocking piece and the third blocking piece; an included angle between the backspacing groove and the discharge groove is an acute angle; the feeding groove is positioned between the front beam and the discharge groove;

one end of the piezoelectric bimorph is fixedly connected with the third retaining piece, and the other end of the piezoelectric bimorph abuts against the second retaining piece and is used for isolating the feed chute and the backspacing chute under the non-driving state to enable the feed chute to be communicated with the discharge chute, and isolating the feed chute and the discharge chute under the driving state to enable the feed chute to be communicated with the backspacing chute.

7. The operating method of an in-plane traveling wave type linear feeder according to claim 6, comprising the steps of:

the front beam, the first connecting piece, the middle beam, the first pre-tightening screw, the first piezoelectric unit and the second piezoelectric unit form a piezoelectric transducer; if the materials are required to be conveyed from the feeding groove to the discharging groove or the backspacing groove, a sinusoidal signal with preset frequency is applied to the piezoelectric transducer, a longitudinal vibration mode of the piezoelectric transducer is excited, vibration is transmitted from the piezoelectric transducer to the damping material and is absorbed by the damping material, and a traveling wave mode of the middle beam is induced; under the traveling wave mode, the vibration mode of a single mass point on the center sill is represented as elliptical motion, so that materials placed on the center sill move towards the traveling wave propagation direction under the driving of the friction force of the elliptical motion of each mass point;

if the feeding groove and the backspacing groove need to be isolated, the feeding groove is communicated with the discharging groove, and the piezoelectric bimorph is not driven;

if the feeding groove and the discharging groove are required to be isolated, the feeding groove is communicated with the backspacing groove, and a preset direct current signal is input to the piezoelectric bimorph, so that the piezoelectric bimorph can be bent.

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