A device for adjustable manipulation and precise screening of particulate matter based on a vibration structure

Abstract

The present invention discloses an adjustable manipulation and precision screening device for particulate matter based on a vibration structure, comprising: a container, an angle-tilted platform, a vibration plate, a blocking plate, a power amplifier, and a function generator. At least two types of particles are placed on the side of the vibration plate away from the angle-tilted platform, and the sizes of any two particles are different. By setting the vibration plate to be tilted relative to the ground, the particles are affected by the gravity component. By adjusting the preset frequency of the sinusoidal signal generated by the function generator, the sound field near the vibration plate can be changed, and the force conditions of particles of different sizes in the sound field are also different. That is, by adjusting the preset frequency of the sinusoidal signal generated by the function generator or the tilt angle of the vibration plate, the combined effect of gravity and the sound field is changed, thereby achieving separation of particles of different sizes; and by changing the sound field near the vibration plate, the stationary position of smaller-sized particles on the vibration plate can also be changed, thereby achieving regulation of the particles.

Description

Technical Field

[0001] The present invention relates to the field of particle separation technology, and more specifically, to a device for adjustable manipulation and precise screening of particle matter based on a vibration structure, or may also be referred to as a device for adjustable manipulation and precise screening of particle matter based on vibrating tweezers. Background Art

[0002] The selective movement, climbing control, and precise separation of diverse particles are crucial for applications in diamond sorting, 3D printing, microfluidic chips, microrobotics, and other fields. The manipulation and separation of diverse particles can be achieved using various forces, such as optical, magnetic, electric, vibrational, and acoustic forces. Optical, electric, and magnetic forces typically require particles with specific properties for manipulation and separation, while vibrational and acoustic forces offer the advantage of manipulating particles of any properties and have been extensively studied for particle motion, patterning, and separation. Furthermore, vibrational and acoustic forces can provide significant external forces and can be transposed to other platforms and scales, such as robotic locomotion of large objects. This involves inserting particles into a vibrating tube, allowing them to climb along the tube's extension, a process known as robotic climbing. Generally, for the climbing and separation of large objects, particles are driven by the combined action of an acoustic field and gravity.

[0003] Acoustic tweezers, a recent state-of-the-art technique, present difficulties in individually selecting and moving particles. Particles are often trapped in mechanical equilibrium positions, near nodal lines or antinodal points, requiring manipulation to one or two positions, hindering selective manipulation. Generally, manipulation methods focus on transducer arrays and acoustic structure design. Transducer arrays generate acoustic fields by switching the drive amplitude and phase. However, all particles are trapped at antinodal lines or nodal lines, making selective manipulation of multiple particles difficult, and manipulation and separation of large particles challenging. Tunable manipulation of micropillar arrays of transducers can be achieved by switching the transducer's vibration mode. When the transducer vibrates, larger particles aggregate at nodal lines, a phenomenon widely studied and known as Chladni patterns. Smaller particles are dragged to antinodal points by the acoustic streaming, forming inverse Chladni patterns, which can be used to study the separation of multiple particles.

[0004] Therefore, the present invention provides an adjustable manipulation and precision screening device for particulate matter based on a vibrating structure. Summary of the Invention

[0005] In view of this, the present invention provides an adjustable manipulation and precision screening device for particulate matter based on a vibration structure, or can also be called an adjustable manipulation and precision screening device for particulate matter based on vibrating tweezers.

[0006] In one aspect, the present invention provides a device for adjustable manipulation and precision screening of particulate matter based on a vibration structure, or also referred to as a device for adjustable manipulation and precision screening of particulate matter based on vibrating tweezers, comprising a container, an angled tilting platform, a vibrating plate, a baffle, a power amplifier, and a function generator, wherein:

[0007] The container comprises a bottom surface parallel to the ground, and the container contains liquid;

[0008] The angled inclined platform contacts the side of the bottom surface away from the ground, and the angled inclined platform includes a top surface away from the ground, the orthographic projection of the top surface on the ground is a rectangle, and the angle between the top surface and the ground is an acute angle;

[0009] The vibration plate is parallel to the plane where the top surface is located. The vibration plate includes a stacked piezoelectric sheet and a glass plate. The orthographic projection of the piezoelectric sheet on the plane where the top surface is located overlaps with the orthographic projection of the glass plate on the plane where the top surface is located. The orthographic projection of the glass plate on the plane where the top surface is located is a rectangle, and the extension direction of the glass plate is perpendicular to the extension direction of the top surface. The side of the piezoelectric sheet away from the glass plate includes a connection area and a non-connection area. The connection area and the non-connection area are arranged in sequence along the extension direction of the glass plate. The orthographic projection of the connection area on the plane where the top surface is located is a rectangle, and the connection area is fixedly connected to the top surface. Along the extension direction of the glass plate, the length of the connection area is A, the length of the piezoelectric sheet is B, and A / B = 1:4. In the direction perpendicular to the ground, the maximum distance from the liquid surface to the bottom surface is C, and the maximum distance from the vibration plate to the bottom surface is D, and C>D.

[0010] The blocking plate is located on a side of the glass plate away from the piezoelectric piece, and the orthographic projection of the blocking plate on the plane where the top surface is located is located within the orthographic projection range of the connection area on the plane where the top surface is located;

[0011] The output end of the power amplifier is connected to an end of the piezoelectric sheet close to the top surface along the extension direction of the glass plate;

[0012] The output end of the function generator is connected to the input end of the power amplifier;

[0013] At least two kinds of particles are placed on the side of the vibration plate away from the angled platform, and the sizes of any two of the particles are different; the function generator is configured to generate sinusoidal signals of different preset frequencies and transmit them to the power amplifier, and the power amplifier amplifies the received sinusoidal signal of the preset frequency in real time and transmits it to the piezoelectric piece; the piezoelectric piece vibrates in real time according to the received amplified sinusoidal signal of the preset frequency; the size of the preset frequency is adjusted to separate at least one of the particles, or to separate at least one of the particles and regulate the position of at least one of the particles.

[0014] Optionally, the number of the vibration plates is at least two, and the at least two vibration plates are arranged sequentially along the extension direction of the top surface, with no gap between two adjacent vibration plates;

[0015] The device for adjustable manipulation and precise screening of particulate matter based on a vibration structure further comprises a soft film, the soft film covering a side of the glass plate away from the piezoelectric piece, wherein the orthographic projections of all the vibration plates on the plane where the top surface is located overlap with the orthographic projections of the soft film on the plane where the top surface is located;

[0016] The blocking plate is located on a side of the soft film away from the glass plate, and the blocking plate is arranged corresponding to the vibration plate.

[0017] Optionally, the piezoelectric piece is a piezoelectric ceramic transducer.

[0018] On the other hand, the present invention also provides a method for adjustable manipulation and precise screening of particulate matter based on a vibration structure, which is applied to any of the above-mentioned devices for adjustable manipulation and precise screening of particulate matter based on a vibration structure, comprising: a climbing stage and a screening stage;

[0019] The climbing stage includes: adjusting the preset frequency to gradually increase from a first preset frequency to a second preset frequency, wherein the first preset frequency is less than the second preset frequency, and all the particles first move from the connection area to the non-connection area and then stop;

[0020] The screening stage includes: regulating the angle between the top surface and the ground until one type of particle falls from the non-connected area to the connected area; or adjusting the preset frequency to gradually decrease from the second preset frequency until one type of particle falls from the non-connected area to the connected area; or regulating the angle between the top surface and the ground and regulating the preset frequency to gradually decrease from the second preset frequency until one type of particle falls from the non-connected area to the connected area.

[0021] Optionally, a regulation phase is also included;

[0022] The regulation stage includes: recording the preset frequency corresponding to the particle falling from the non-connection area to the connection area as a third preset frequency, wherein the third preset frequency is greater than the first preset frequency and less than or equal to the second preset frequency;

[0023] The preset frequency is adjusted to gradually decrease from the third preset frequency until the particles move in a direction from the connection area to the non-connection area until they reach a designated position.

[0024] Optionally, when the angle between the top surface and the ground is adjusted, the resultant force on the particles changes; or when the preset frequency is adjusted, the resultant force on the particles changes; or when the angle between the top surface and the ground and the preset frequency are adjusted, the resultant force on the particles changes;

[0025] The resultant force acting on the particle includes an acoustic flow force directed from the connecting region to the non-connecting region, an acoustic radiation force directed from the non-connecting region to the connecting region, and a gravity component directed from the non-connecting region to the connecting region.

[0026] Optionally, the acoustic fluidic force is calculated as follows:

[0027] F d =ρ p / 6πd 3 a d

[0028]

[0029] Among them, F d is the acoustic flow force, ρ p is the density of the particles, d is the diameter of the particles, μ g is the dynamic viscosity coefficient, and Δv is the relative velocity between the particle and the fluid.

[0030] Optionally, the acoustic radiation force is calculated as follows:

[0031]

[0032] Among them, F rad is the acoustic radiation force, α1 is the compressibility factor, α2 is the density factor, r is the radius of the particle, p is the acoustic field, ρ f is the density of the fluid, v is the background velocity field, c f is the sound velocity of the liquid, ρ p is the density of the particles, c p is the sound velocity of the particle.

[0033] Optionally, the gravity component is calculated as follows:

[0034] F g =G sinα

[0035] Among them, F g is the gravity component, G is gravity, and α is the angle between the top surface and the ground.

[0036] Compared with the prior art, the device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention achieves at least the following beneficial effects:

[0037] The present invention provides a device for adjustable manipulation and precision screening of particulate matter based on a vibration structure, comprising: a container, an angled tilted platform, a vibration plate, a baffle, a power amplifier, and a function generator. The angled tilted platform includes a top surface facing away from the ground. The vibration plate is parallel to the plane of the top surface and includes a stacked piezoelectric plate and a glass plate. The side of the piezoelectric plate facing away from the glass plate is connected to the top surface, and the vibration plate extends perpendicular to the direction of extension of the top surface. The input of the power amplifier is connected to the output of the function generator, and the output of the power amplifier is connected to the piezoelectric plate. At least two types of particles are placed on the side of the vibration plate facing away from the angled tilted platform, and any two particles have different sizes. At least one particle is separated by adjusting the preset frequency. The vibration plate is set to be inclined relative to the ground, and the particles are affected by the gravity component. By adjusting the preset frequency of the sinusoidal signal generated by the function generator, the sound field near the vibration plate can be changed, and the force conditions of particles of different sizes in the sound field are also different. That is, by adjusting the preset frequency of the sinusoidal signal generated by the function generator or the inclination angle of the vibration plate, the combined effect of gravity and the sound field is changed, thereby achieving the separation of particles of different sizes; in addition, smaller particles tend to settle at positions close to the anti-node. By adjusting the preset frequency of the sinusoidal signal generated by the function generator, the sound field near the vibration plate is changed, and the position of the anti-node changes accordingly. It is also possible to manipulate the settlement position of smaller particles on the vibration plate to achieve particle regulation.

[0038] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0039] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0041] Figure 1This is a structural schematic diagram of a device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention.

[0042] Figure 2 It is a structural diagram of a vibration plate.

[0043] Figure 3 It is a flow chart of a method for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention.

[0044] Figure 4 It is a force diagram of particles.

[0045] Figure 5 It is a schematic diagram of the resultant force acting on the particle.

[0046] Figure 6 is a schematic diagram of another resultant force acting on the particle.

[0047] In the figure: 1. Container; 2. Bottom surface; 3. Angle tilting platform; 4. Top surface; 5. Vibration plate; 6. Piezoelectric piece; 7. Glass plate; 8. Connecting plate; 9. Non-connecting area; 10. Blocking plate; 11. Power amplifier; 12. Function generator; X, extension direction of the glass plate; Y, extension direction of the top surface; Z, direction perpendicular to the ground. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0051] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0052] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0053] Example 1

[0054] Combine Figure 1 and Figure 2 , Figure 1 This is a structural diagram of a device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention. Figure 2 : is a structural diagram of a vibration plate, illustrating a specific embodiment of a device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention, or also a specific embodiment of a device for adjustable manipulation and precise screening of particulate matter based on vibrating tweezers, comprising a container 1, an angle tilting platform 3, a vibration plate 5, a baffle 10, a power amplifier 11, and a function generator 12, wherein:

[0055] The container 1 includes a bottom surface 2 parallel to the ground, and the container 1 contains liquid;

[0056] The angled inclined platform 3 contacts the side of the bottom surface 2 away from the ground. The angled inclined platform 3 includes a top surface 4 away from the ground. The orthographic projection of the top surface 4 on the ground is a rectangle, and the angle between the top surface 4 and the ground is an acute angle.

[0057] The vibration plate 5 is parallel to the plane where the top surface 4 is located. The vibration plate 5 includes a stacked piezoelectric piece 6 and a glass plate 7. The orthographic projection of the piezoelectric piece 6 on the plane where the top surface 4 is located overlaps with the orthographic projection of the glass plate 7 on the plane where the top surface 4 is located. The orthographic projection of the glass plate 7 on the plane where the top surface 4 is located is a rectangle. The extension direction X of the glass plate 7 is perpendicular to the extension direction Y of the top surface 4. The side of the piezoelectric piece 6 away from the glass plate 7 includes a connection area 8 and a non-connection area 9. The connection area 8 and the non-connection area 9 are arranged sequentially along the extension direction X of the glass plate 7. The orthographic projection of the connection area 8 on the plane where the top surface 4 is located is a rectangle. The connection area 8 is fixedly connected to the top surface 4. Along the extension direction X of the glass plate 7, the length of the connection area 8 is A, the length of the piezoelectric piece 6 is B, and A / B = 1:4. Along the direction Z perpendicular to the ground, the maximum distance from the liquid surface to the bottom surface 2 is C, and the maximum distance from the vibration plate 5 to the bottom surface 2 is D, and C>D.

[0058] The blocking plate 10 is located on the side of the glass plate 7 away from the piezoelectric plate 6, and the orthographic projection of the blocking plate 10 on the plane where the top surface 4 is located is located within the orthographic projection range of the connecting area 8 on the plane where the top surface 4 is located;

[0059] The output end of the power amplifier 11 is connected to one end of the piezoelectric plate 6 close to the top surface 4 along the extension direction X of the glass plate 7;

[0060] The output terminal of the function generator 12 is connected to the input terminal of the power amplifier 11;

[0061] At least two kinds of particles are placed on the side of the vibration plate 5 away from the angled platform 3, and the sizes of any two particles are different, while the sizes of the same kind of particles are the same or similar; the function generator 12 is configured to generate sinusoidal signals of different preset frequencies and transmit them to the power amplifier 11, and the power amplifier 11 amplifies the received sinusoidal signal of the preset frequency in real time and transmits it to the piezoelectric piece 6; the piezoelectric piece 6 vibrates in real time according to the received amplified sinusoidal signal of the preset frequency; the size of the preset frequency is adjusted to separate at least one particle, or to separate at least one particle and regulate the position of at least one particle.

[0062] It should be noted that, in this embodiment, the model of the angle tilting platform 3 is GFG60-60, and the angle tilting platform 3 can adjust the angle between the top surface 4 and the ground; the piezoelectric piece 6 is a piezoelectric ceramic transducer, which can also be called a PZT transducer; the model of the function generator 12 is Agilent 33220A. Of course, it is not limited to this and can be adjusted according to actual conditions.

[0063] It is understood that in water, the sinusoidal signal generated by function generator 12 is amplified by power amplifier 11 and input into piezoelectric plate 6, which then responds to bending vibrations and generates an acoustic field. For vibrating plate 5, the region with the largest vibration amplitude is called the anti-node position, and the region with the smallest vibration amplitude is called the node position. The smaller the particle size, the greater the force exerted by the acoustic field and the smaller the effect of the gravity component. The larger the particle size, the smaller the force exerted by the acoustic field and the larger the effect of the gravity component. Therefore, by adjusting the preset frequency or the tilt angle of vibrating plate 5, the combined effects of the acoustic field and the gravity component are utilized to achieve separation of at least one particle.

[0064] Compared with the prior art, the device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided in this embodiment has at least the following advantages:

[0065] This embodiment provides an adjustable manipulation and precision screening device for particulate matter based on a vibration structure, comprising: a container 1, an angled tilted platform 3, a vibration plate 5, a baffle 10, a power amplifier 11, and a function generator 12. The angled tilted platform 3 includes a top surface 4 on the side facing away from the ground. The vibration plate 5 is parallel to the plane of the top surface 4 and includes a stacked piezoelectric plate 6 and a glass plate 7. The side of the piezoelectric plate 6 facing away from the glass plate 7 is connected to the top surface 4, and the extension direction of the vibration plate 5 is perpendicular to the extension direction Y of the top surface 4. The input end of the power amplifier 11 is connected to the output end of the function generator 12, and the output end of the power amplifier 11 is connected to the piezoelectric plate 6. At least two types of particles are placed on the side of the vibration plate 5 facing away from the angled tilted platform 3. Any two particles have different sizes. At least one particle can be separated by adjusting the preset frequency. The vibration plate 5 is set to be inclined relative to the ground, and the particles are affected by the gravity component. By adjusting the preset frequency of the sinusoidal signal generated by the function generator 12, the sound field near the vibration plate 5 can be changed, and the force conditions of particles of different sizes in the sound field are also different. That is, by adjusting the preset frequency of the sinusoidal signal generated by the function generator 12 or the inclination angle of the vibration plate 5, the combined effect of gravity and the sound field is changed, thereby realizing the separation of particles of different sizes; and, smaller-sized particles tend to settle at positions close to the anti-node. By adjusting the preset frequency of the sinusoidal signal generated by the function generator 12, the sound field near the vibration plate 5 is changed, and the position of the anti-node changes accordingly. It is also possible to manipulate the settlement position of smaller-sized particles on the vibration plate 5 to realize the regulation of the particles.

[0066] Example 2

[0067] Continue to refer to Figure 1 and Figure 2 , to illustrate another specific embodiment of a device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention, comprising a container 1, an angle tilting platform 3, a vibration plate 5, a baffle 10, a power amplifier 11, and a function generator 12, wherein:

[0068] The container 1 includes a bottom surface 2 parallel to the ground, and the container 1 contains liquid;

[0069] The angled inclined platform 3 contacts the side of the bottom surface 2 away from the ground. The angled inclined platform 3 includes a top surface 4 away from the ground. The orthographic projection of the top surface 4 on the ground is a rectangle, and the angle between the top surface 4 and the ground is an acute angle.

[0070] The vibration plate 5 is parallel to the plane where the top surface 4 is located. The vibration plate 5 includes a stacked piezoelectric piece 6 and a glass plate 7. The orthographic projection of the piezoelectric piece 6 on the plane where the top surface 4 is located overlaps with the orthographic projection of the glass plate 7 on the plane where the top surface 4 is located. The orthographic projection of the glass plate 7 on the plane where the top surface 4 is located is a rectangle. The extension direction X of the glass plate 7 is perpendicular to the extension direction Y of the top surface 4. The side of the piezoelectric piece 6 away from the glass plate 7 includes a connection area 8 and a non-connection area 9. The connection area 8 and the non-connection area 9 are arranged sequentially along the extension direction X of the glass plate 7. The orthographic projection of the connection area 8 on the plane where the top surface 4 is located is a rectangle. The connection area 8 is fixedly connected to the top surface 4. Along the extension direction X of the glass plate 7, the length of the connection area 8 is A, the length of the piezoelectric piece 6 is B, and A / B = 1:4. Along the direction Z perpendicular to the ground, the maximum distance from the liquid surface to the bottom surface 2 is C, and the maximum distance from the vibration plate 5 to the bottom surface 2 is D, and C>D.

[0071] The blocking plate 10 is located on the side of the glass plate 7 away from the piezoelectric plate 6, and the orthographic projection of the blocking plate 10 on the plane where the top surface 4 is located is located within the orthographic projection range of the connecting area 8 on the plane where the top surface 4 is located;

[0072] The output end of the power amplifier 11 is connected to one end of the piezoelectric plate 6 close to the top surface 4 along the extension direction X of the glass plate 7;

[0073] The output terminal of the function generator 12 is connected to the input terminal of the power amplifier 11;

[0074] At least two kinds of particles are placed on the side of the vibration plate 5 away from the angled platform 3, and the sizes of any two particles are different; the function generator 12 is configured to generate sinusoidal signals of different preset frequencies and transmit them to the power amplifier 11, and the power amplifier 11 amplifies the received sinusoidal signal of the preset frequency in real time and transmits it to the piezoelectric piece 6; the piezoelectric piece 6 vibrates in real time according to the received amplified sinusoidal signal of the preset frequency; the size of the preset frequency is adjusted to separate at least one particle, or to separate at least one particle and regulate the position of at least one particle.

[0075] It should be noted that in this embodiment, the piezoelectric plate 6 is a piezoelectric ceramic transducer. There can be at least two vibration plates 5, with at least two vibration plates 5 arranged sequentially along the extension direction Y of the top surface 4, with no spacing between adjacent vibration plates 5. This embodiment provides a vibration-structure-based adjustable manipulation and precision screening device for particulate matter, further comprising a soft film covering the side of the glass plate 7 facing away from the piezoelectric plate 6. The orthographic projections of all vibration plates 5 on the plane of the top surface 4 overlap with the orthographic projections of the soft film on the plane of the top surface 4. A baffle plate 10 is located on the side of the soft film facing away from the glass plate 7 and is disposed correspondingly to the vibration plate 5. Along the extension direction Y of the top surface 4, all vibration plates 5 and all baffle plates 10 overlap. Considering each vibration plate 5 as a separate unit, providing at least two vibration plates 5 allows at least two units to simultaneously perform particle separation or manipulation operations, thereby improving efficiency. A soft film is set to cover all vibration plates 5, that is, all vibration plates 5 are connected into a whole, and the soft film will not affect the vibration of a single unit after connection. Setting the soft film can also prevent the tiny gap between two adjacent vibration plates 5 from affecting the separation or regulation effect of particles.

[0076] Specifically, adjusting the magnitude of the preset frequency to separate at least one particle includes: a climbing stage and a screening stage;

[0077] The climbing stage includes: adjusting the preset frequency from a first preset frequency to a second preset frequency, the first preset frequency being lower than the second preset frequency, and all particles first moving from the connection area 8 to the non-connection area 9 and then stopping;

[0078] The screening stage includes: adjusting the angle between the top surface 4 and the ground until a particle falls from the non-connected area 9 to the connected area 8; or, adjusting the preset frequency to gradually decrease from the second preset frequency until a particle falls from the non-connected area 9 to the connected area 8; or, adjusting the angle between the top surface 4 and the ground and adjusting the preset frequency to gradually decrease from the second preset frequency until a particle falls from the non-connected area 9 to the connected area 8.

[0079] Furthermore, if the magnitude of the preset frequency is adjusted to separate at least one particle and control the position of at least one particle, a control stage is also included;

[0080] The control stage includes: recording a preset frequency corresponding to a particle falling from the non-connection area 9 to the connection area 8 as a third preset frequency, the third preset frequency being greater than the first preset frequency and less than or equal to the second preset frequency;

[0081] The preset frequency is adjusted to gradually decrease from the third preset frequency until a particle moves in a direction from the connection area 8 to the non-connection area 9 until it reaches a designated position.

[0082] By setting the vibration plate 5 to be tilted relative to the ground, the particles are affected by the gravity component. By adjusting the preset frequency of the sinusoidal signal generated by the function generator 12, the sound field near the vibration plate 5 can be changed, and the force conditions of particles of different sizes in the sound field are also different. That is, by adjusting the preset frequency of the sinusoidal signal generated by the function generator 12 or the tilt angle of the vibration plate 5, the combined effect of gravity and the sound field is changed, thereby achieving the separation of particles of different sizes; and, smaller particles tend to settle at positions close to the anti-node. By adjusting the preset frequency of the sinusoidal signal generated by the function generator 12, the sound field near the vibration plate 5 is changed, and the position of the anti-node changes accordingly. It is also possible to manipulate the settlement position of smaller particles on the vibration plate 5 to achieve particle regulation.

[0083] Example 3

[0084] In this embodiment, polystyrene with a diameter of 1 mm and silicon dioxide with a diameter of 0.5 mm are placed on the side of the vibration plate away from the top surface.

[0085] In the initial state, both polystyrene and silica particles are located at the bottom of the vibrating plate.

[0086] The voltage of the function generator is set to 100 V, and the frequency of the corresponding sinusoidal signal is 4 kHz. At this time, due to the action of local acoustic fluidic force, the polystyrene and silica particles are gradually pulled up.

[0087] By adjusting the frequency of the sinusoidal signal generated by the function generator, that is, adjusting the voltage of the function generator, gradually increasing from 100 V to 600 V, the particles climb higher through a larger acoustic flow, and the particles remain stable at the anti-node.

[0088] The voltage is then reduced to 100V, selectively manipulating the large polystyrene particles, causing them to roll down, while the small silica particles remain on top of the vibrating plate, separating the two types of particles into different locations.

[0089] In this example, by studying the combined acoustic field on an inclined vibrating plate, we propose acoustic streaming that balances the weight component. Particles ascend on the plate. Then, due to the differential effects of the combined acoustic streaming and radiation forces, two or more types of particles are selectively manipulated and separated to different locations. Finally, by continuously switching the plate's vibration mode, adjustable separation is achieved.

[0090] Example 4

[0091] Reference Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , Figure 3A schematic flow chart of a method for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention. Figure 4 is a force diagram of the particle. Figure 5 is a schematic diagram of the resultant force acting on the particle. Figure 6 is a schematic diagram of another resultant force acting on particles, illustrating a specific embodiment of a method for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided in this embodiment, which is applicable to a device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided in any of the above embodiments, including: a climbing stage and a screening stage;

[0092] S101: The climbing stage includes: adjusting the preset frequency from a first preset frequency to a second preset frequency, wherein the first preset frequency is lower than the second preset frequency, and all particles first move from the connection area to the non-connection area and then stop;

[0093] S102: The screening stage includes: adjusting the angle between the top surface and the ground until a type of particle falls from the non-connected area to the connected area; or adjusting the preset frequency to gradually decrease from the second preset frequency until a type of particle falls from the non-connected area to the connected area; or adjusting the angle between the top surface and the ground and adjusting the preset frequency to gradually decrease from the second preset frequency until a type of particle falls from the non-connected area to the connected area.

[0094] It should be noted that if one wishes to regulate the position of the particles resting on the vibration plate after the screening stage, the regulation stage is also included;

[0095] S103: The control stage includes: recording a preset frequency corresponding to a particle falling from the non-connection area to the connection area as a third preset frequency, wherein the third preset frequency is greater than the first preset frequency and less than or equal to the second preset frequency;

[0096] The preset frequency is adjusted to gradually decrease from the third preset frequency until a particle moves from the connection area to the non-connection area until it reaches the designated position.

[0097] It is understood that when the angle between the top surface and the ground is adjusted, the resultant force on the particles changes; or when the preset frequency is adjusted, the resultant force on the particles changes; or when the angle between the top surface and the ground and the preset frequency are adjusted, the resultant force on the particles changes;

[0098] The resultant force on the particles includes the acoustic flow force from the connected area to the non-connected area, the acoustic radiation force from the non-connected area to the connected area, and the gravity component from the non-connected area to the connected area.

[0099] Specifically, adjusting the angle between the control top surface and the ground is used to change the gravity component acting on the particles; adjusting the preset frequency is used to change the acoustic flow force and acoustic radiation force acting on the particles. Therefore, adjusting the angle between the control top surface and the ground or adjusting the preset frequency is used to change the resultant force acting on the particles.

[0100] Reference Figure 4 、 Figure 5 and Figure 6 ,exist Figure 4 In the middle, the red a d Indicates the acoustic fluid acceleration, the blue a rad Represents the acoustic radiation force acceleration, the black a g represents the acceleration due to gravity; Figure 5 In the figure, the blue dotted line represents the acoustic flow force on the particle, the red dotted line represents the combined force of the acoustic radiation force and the acoustic flow force on the particle, and the black line represents the acoustic radiation force on the particle; Figure 6 In the figure, the black line represents the acceleration of a particle with a radius equal to the preset length, the red dotted line represents the acceleration of a particle with a radius of 1.5 times the preset length, the green dotted line represents the acceleration of a particle with a radius of 2 times the preset length, and the purple dotted line represents the acceleration of a particle with a radius of 3 times the preset length.

[0101] Since the separation or regulation of particles on the inclined vibration plate 5 is completed in the water, the relationship between the fluid and the solid is first calculated in the following way:

[0102]

[0103] -n·σ=-pn

[0104] Where n is the normal vector of the fluid-solid interface, ρ f is the density of the fluid, p is the acoustic field, ü is the structural acceleration, and σ is the stress tensor of the solid structure.

[0105] For a two-dimensional acoustic field with a transducer, the corresponding velocity field is calculated as follows:

[0106]

[0107] Where v is the background velocity field, p is the sound field, i is an imaginary number, f is the excitation frequency, ρ f is the density of the fluid.

[0108] Based on the sound field and velocity field, the acoustic radiation force on the particles in the sound field can be calculated as follows:

[0109]

[0110] Among them, F radis the acoustic radiation force, α1 is the compressibility factor, α2 is the density factor, r is the radius of the particle, p is the sound field, ρ f is the density of the fluid, v is the background velocity field, c f is the speed of sound in the liquid, ρ p is the density of the particles, c p is the sound velocity of the particle.

[0111] Based on the sound field and velocity field, the acoustic flow force on the particles in the sound field can be calculated. The acceleration of the acoustic flow force on the particles is proportional to the relative vertical velocity and can be obtained by Stokes' law. It is calculated as follows:

[0112] F d =ρ p / 6πd 3 a d

[0113]

[0114] Among them, F d is the acoustic flow force, ρ p is the density of the particle, d is the diameter of the particle, μ g is the dynamic viscosity coefficient, and Δv is the relative velocity between particles and fluid.

[0115] The particles are also subject to a gravity component, which is calculated as follows:

[0116] F g =Gsinα

[0117] Among them, F g is the gravity component, G is gravity, and α is the angle between the top surface and the ground.

[0118] Reference Figure 4 The direction of the acoustic radiation force is from the non-connected area 9 to the connected area 8, and the direction of the acoustic flow force is from the connected area 8 to the non-connected area 9. Under the excitation of bending vibration, the particles are mainly affected by the acoustic flow force, acoustic radiation force and gravity components.

[0119] Reference Figure 5 and Figure 6 The particle is reasonably subjected to the anti-node x aThe force near the vibrating plate 5 first increases and then decreases to 0. The particles are pulled upward by the acoustic flow force and pulled downward by the acoustic radiation force and the gravity component. For particles of different sizes, the resultant force is different, and the equilibrium position also deviates from the anti-node. In the screening stage, increasing the inclination angle of the vibration plate 5 can increase the gravity component on the particles, so that the gravity component of some particles is adjusted to be greater than the upward force they are pulled by in the sound field, causing some particles to fall and separating at least one particle. In the screening stage, the frequency of the sinusoidal signal can also be gradually reduced. The smaller the particle size, the greater the force on the particle from the sound field, thereby adjusting the resultant force on the particle, causing some particles to fall and separating at least one particle.

[0120] Reference Figure 6 Because smaller particles are subject to greater force from the acoustic field, their maximum point is higher and they are more likely to settle at the anti-node. The upward pull on the particles increases with the excitation amplitude and particle size, and the corresponding equilibrium domain becomes larger, making it easier for smaller particles to be pulled higher. The excitation amplitude corresponds to the frequency of the sinusoidal signal, so by adjusting the frequency of the sinusoidal signal, the settling position of smaller particles can also be adjusted, completing particle control.

[0121] From the above embodiments, it can be seen that the device for adjustable manipulation and precise screening of particulate matter based on a vibration structure provided by the present invention achieves at least the following beneficial effects:

[0122] The present invention provides a device for adjustable manipulation and precision screening of particulate matter based on a vibration structure, comprising: a container, an angled tilted platform, a vibration plate, a baffle, a power amplifier, and a function generator. The angled tilted platform includes a top surface facing away from the ground. The vibration plate is parallel to the plane of the top surface and includes a stacked piezoelectric plate and a glass plate. The side of the piezoelectric plate facing away from the glass plate is connected to the top surface, and the vibration plate extends perpendicular to the direction of extension of the top surface. The input of the power amplifier is connected to the output of the function generator, and the output of the power amplifier is connected to the piezoelectric plate. At least two types of particles are placed on the side of the vibration plate facing away from the angled tilted platform, and any two particles have different sizes. At least one particle is separated by adjusting the preset frequency. The vibration plate is set to be inclined relative to the ground, and the particles are affected by the gravity component. By adjusting the preset frequency of the sinusoidal signal generated by the function generator, the sound field near the vibration plate can be changed, and the force conditions of particles of different sizes in the sound field are also different. That is, by adjusting the preset frequency of the sinusoidal signal generated by the function generator or the inclination angle of the vibration plate, the combined effect of gravity and the sound field is changed, thereby achieving the separation of particles of different sizes; in addition, smaller particles tend to settle at positions close to the anti-node. By adjusting the preset frequency of the sinusoidal signal generated by the function generator, the sound field near the vibration plate is changed, and the position of the anti-node changes accordingly. It is also possible to manipulate the settlement position of smaller particles on the vibration plate to achieve particle regulation.

[0123] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A device for adjustable manipulation and precise screening of particulate matter based on a vibration structure, characterized in that: The device comprises a container, an angle tilting platform, a vibration plate, a blocking plate, a power amplifier, and a function generator, wherein: The container comprises a bottom surface parallel to the ground, and the container contains liquid; The angled inclined platform contacts the side of the bottom surface away from the ground, and the angled inclined platform includes a top surface away from the ground, the orthographic projection of the top surface on the ground is a rectangle, and the angle between the top surface and the ground is an acute angle; The vibration plate is parallel to the plane where the top surface is located. The vibration plate includes a stacked piezoelectric sheet and a glass plate. The orthographic projection of the piezoelectric sheet on the plane where the top surface is located overlaps with the orthographic projection of the glass plate on the plane where the top surface is located. The orthographic projection of the glass plate on the plane where the top surface is located is a rectangle, and the extension direction of the glass plate is perpendicular to the extension direction of the top surface. The side of the piezoelectric sheet away from the glass plate includes a connection area and a non-connection area. The connection area and the non-connection area are arranged in sequence along the extension direction of the glass plate. The orthographic projection of the connection area on the plane where the top surface is located is a rectangle, and the connection area is fixedly connected to the top surface. Along the extension direction of the glass plate, the length of the connection area is A, the length of the piezoelectric sheet is B, and A / B = 1:

4. In the direction perpendicular to the ground, the maximum distance from the liquid surface to the bottom surface is C, and the maximum distance from the vibration plate to the bottom surface is D, and C>D. The blocking plate is located on a side of the glass plate away from the piezoelectric piece, and the orthographic projection of the blocking plate on the plane where the top surface is located is located within the orthographic projection range of the connection area on the plane where the top surface is located; The output end of the power amplifier is connected to an end of the piezoelectric sheet close to the top surface along the extension direction of the glass plate; The output end of the function generator is connected to the input end of the power amplifier; At least two kinds of particles are placed on the side of the vibration plate away from the angled platform, and the sizes of any two of the particles are different; the function generator is configured to generate sinusoidal signals of different preset frequencies and transmit them to the power amplifier, and the power amplifier amplifies the received sinusoidal signal of the preset frequency in real time and transmits it to the piezoelectric piece; the piezoelectric piece vibrates in real time according to the received amplified sinusoidal signal of the preset frequency; the size of the preset frequency is adjusted to separate at least one of the particles, or to separate at least one of the particles and regulate the position of at least one of the particles.

2. The device for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 1, characterized in that: The number of the vibration plates is at least two, and the at least two vibration plates are arranged sequentially along the extension direction of the top surface, with no gap between two adjacent vibration plates; The device for adjustable manipulation and precise screening of particulate matter based on a vibration structure further comprises a soft film, the soft film covering a side of the glass plate away from the piezoelectric piece, wherein the orthographic projections of all the vibration plates on the plane where the top surface is located overlap with the orthographic projections of the soft film on the plane where the top surface is located; The blocking plate is located on a side of the soft film away from the glass plate, and the blocking plate is arranged corresponding to the vibration plate.

3. The device for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 1, characterized in that: The piezoelectric piece is a piezoelectric ceramic transducer.

4. A method for adjustable manipulation and precise screening of particulate matter based on a vibration structure, characterized in that: An adjustable manipulation and precision screening device for particulate matter based on a vibration structure as claimed in any one of claims 1 to 3, comprising: a climbing stage and a screening stage; The climbing stage includes: adjusting the preset frequency to gradually increase from a first preset frequency to a second preset frequency, wherein the first preset frequency is less than the second preset frequency, and all the particles first move from the connection area to the non-connection area and then stop; The screening stage includes: regulating the angle between the top surface and the ground until one type of particle falls from the non-connected area to the connected area; or adjusting the preset frequency to gradually decrease from the second preset frequency until one type of particle falls from the non-connected area to the connected area; or regulating the angle between the top surface and the ground and regulating the preset frequency to gradually decrease from the second preset frequency until one type of particle falls from the non-connected area to the connected area.

5. The method for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 4, characterized in that: It also includes the regulation phase; The regulation stage includes: recording the preset frequency corresponding to the particle falling from the non-connection area to the connection area as a third preset frequency, wherein the third preset frequency is greater than the first preset frequency and less than or equal to the second preset frequency; The preset frequency is adjusted to gradually decrease from the third preset frequency until the particles move in a direction from the connection area to the non-connection area until they reach a designated position.

6. The method for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 4, characterized in that: When the angle between the top surface and the ground is adjusted, the resultant force on the particles changes; or when the preset frequency is adjusted, the resultant force on the particles changes; or when the angle between the top surface and the ground and the preset frequency are adjusted, the resultant force on the particles changes; The resultant force acting on the particle includes an acoustic flow force directed from the connecting region to the non-connecting region, an acoustic radiation force directed from the non-connecting region to the connecting region, and a gravity component directed from the non-connecting region to the connecting region.

7. The method for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 6, characterized in that: The acoustic fluid force is calculated as follows: F d =ρ p / 6πd 3 a d Among them, F d is the acoustic flow force, ρ p is the density of the particles, d is the diameter of the particles, μ g is the dynamic viscosity coefficient, and Δv is the relative velocity between the particle and the fluid.

8. The method for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 6, characterized in that: The acoustic radiation force is calculated as follows: Among them, F rad is the acoustic radiation force, α1 is the compressibility factor, α2 is the density factor, r is the radius of the particle, p is the acoustic field, ρ f is the density of the fluid, v is the background velocity field, c f is the sound velocity of the liquid, ρ p is the density of the particles, c p is the sound velocity of the particle.

9. The method for adjustable manipulation and precise screening of particulate matter based on a vibration structure according to claim 6, characterized in that: The gravity component is calculated as follows: F g =Gsinα Among them, F g is the gravity component, G is gravity, and α is the angle between the top surface and the ground.

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