Particle substance adjustable control and precision screening device based on vibration structure

Abstract

The invention discloses a particulate matter adjustable control and precision screening device based on a vibration structure, the particulate matter adjustable control and precision screening device comprises a container, an angle inclined platform, a vibration plate, a barrier plate, a power amplifier and a function generator, at least two kinds of particles are placed on the side, away from the angle inclined platform, of the vibration plate, and the sizes of any two kinds of particles are different. The vibration plate is inclined relative to the ground, the particles are subjected to the action of gravity components, the sound field near the vibration plate can be changed by adjusting the preset frequency of the sinusoidal signal generated by the function generator, and the stress conditions of the particles of different sizes in the sound field are different. Namely, the combined action of gravity and a sound field is changed by adjusting the preset frequency of a sinusoidal signal generated by a function generator or the inclination angle of a vibration plate, so that the separation of particles with different sizes is realized; and moreover, the sound field near the vibration plate is changed, and the stopping positions of particles with smaller sizes on the vibration plate can be changed, so that the regulation and control of the particles are realized.

Description

Technical Field

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

[0002] The selective movement, climbing control and precise separation of multiple particles are crucial in applications such as diamond sorting, 3D printing, microfluidic chips, and microrobots. The manipulation and separation of multiple particles can be achieved through different types of forces, such as optical force, magnetic field force, electric field force, vibration force, and acoustic force. Among them, the manipulation and separation of particles using optical force, electric field force, and magnetic field force usually require particles to have special properties, while vibration force and acoustic force have the advantage of being able to manipulate particles of any nature and have been widely studied in particle movement, patterning, and separation. In addition, the use of vibration force and acoustic force can provide a large external force and can be transposed to other platforms and scales, such as the robotic movement of large objects, that is, inserting particles in a vibrating tube, and the particles can climb along the extension direction of the tube, which is called robotic climbing. In general, for the climbing and separation of large objects, the particles are driven by the combined action of the acoustic field and gravity.

[0003] Acoustic tweezers, as the most recent prior art, have difficulty in selecting and moving particles individually. Particles are usually trapped in mechanical equilibrium positions, i.e., positions close to the nodal line or anti-nodal line. Particles are manipulated to one or two positions, which hinders selective manipulation. In general, manipulation methods focus on transducer arrays and acoustic structure design. Transducer arrays generate acoustic fields by switching drive amplitude and phase. However, all particles are trapped on the anti-nodal line or the nodal line. Selective manipulation of multiple particles is difficult, and it is difficult to manipulate and separate large particles. Adjustable manipulation of micro-pillar arrays of transducers can be achieved by switching the vibration mode of the transducer. When the transducer vibrates, larger particles gather on the nodal line. This phenomenon is widely studied and is called Chladni pattern. Smaller particles are dragged to the anti-nodal line due to the acoustic flow to form an inverse Chladni pattern. The inverse Chladni pattern 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 vibration 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 it can also be called an adjustable manipulation and precision screening device for particulate matter based on vibrating tweezers.

[0006] On the one hand, 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, comprising a container, an angle tilting platform, a vibration plate, a blocking plate, 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 is in contact with a side of the bottom surface away from the ground, 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, and 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; along 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 sheet, 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 sheet; the piezoelectric sheet 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 at least one of the particles is separated and the position of at least one of the particles is regulated.

[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, and there is no interval between two adjacent vibration plates;

[0015] The device for adjustable manipulation and precision screening of particulate matter based on a vibration structure also includes a soft film, which covers a side of the glass plate away from the piezoelectric sheet, and 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 at 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 precision screening of particulate matter based on a vibration structure, which is applied to any of the above-mentioned devices for adjustable manipulation and precision 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, the first preset frequency is less than the second preset frequency, and all the particles first move in a direction from the connection area to the non-connection area and then stop;

[0020] The screening stage includes: adjusting the angle between the top surface and the ground until one of the particles 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 of the particles 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 one of the particles 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 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;

[0023] The preset frequency is adjusted to gradually decrease from the third preset frequency until one of the particles moves in a direction from the connection area to the non-connection area until reaching 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 is adjusted and the preset frequency is adjusted, the resultant force on the particles changes;

[0025] The resultant force 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 fluid force is calculated in the following manner:

[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 particle, d is the diameter of the particle, 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 in the following manner:

[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 particle, 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 the gravity, and α is the angle between the top surface and the ground.

[0036] Compared with the prior art, the device for adjustable control 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 an adjustable control and precision screening device for particulate matter based on a vibration structure, comprising: a container, an angle tilting platform, a vibration plate, a blocking plate, a power amplifier and a function generator; the angle tilting platform comprises a top surface on a side away from the ground; the vibration plate is parallel to the plane where the top surface is located, and comprises a stacked piezoelectric sheet and a glass plate, the side of the piezoelectric sheet away from the glass plate is connected to the top surface, and the extension direction of the vibration plate is perpendicular to the extension direction of the top surface; the input end of the power amplifier is connected to the output end of the function generator, and the output end of the power amplifier is connected to the piezoelectric sheet. At least two kinds of particles are placed on the side of the vibration plate away from the angle tilting platform, and the sizes of any two particles are different. By adjusting the size of the preset frequency, at least one particle is separated. 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 forces on 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 separation of particles of different sizes; and, smaller particles tend to stay at positions close to anti-nodes. 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, and the stationary position of the smaller particles on the vibration plate can be manipulated 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 attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 1It is a structural schematic diagram of an adjustable control and precision screening device for 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 It is a schematic diagram of another kind of 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 sheet; 7, glass plate; 8, connecting plate; 9, non-connecting area; 10, blocking plate; 11, power amplifier; 12, function generator; X, extension direction of glass plate; Y, extension direction of 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 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 unless otherwise specifically stated.

[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 as 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 similar 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] Combination Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of a device for adjustable control and precise screening of particulate matter based on a vibration structure provided by the present invention. Figure 2 1 is a structural schematic diagram of a vibration plate, which is used to illustrate 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 can also be called a specific embodiment of a device for adjustable manipulation and precise screening of particulate matter based on vibration tweezers, comprising a container 1, an angle tilting platform 3, a vibration plate 5, a blocking plate 10, a power amplifier 11, and a function generator 12, wherein:

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

[0056] The angled inclined platform 3 is in contact with the side of the bottom surface 2 away from the ground, and 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 sheet 6 and a glass plate 7. The orthographic projection of the piezoelectric sheet 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 piezoelectric sheet 6 includes a connection area 8 and a non-connection area 9 on the side away from the glass plate 7. The connection area 8 and the non-connection area 9 are arranged in sequence 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 sheet 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 sheet 6 close to the top surface 4 along the extension direction X of the glass plate 7;

[0060] The output end of the function generator 12 is connected to the input end 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 sheet 6; the piezoelectric sheet 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 at least one particle is separated and the position of at least one particle is regulated.

[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 understandable that in the water, the sinusoidal signal generated by the function generator 12 is amplified by the power amplifier 11 and then input into the piezoelectric sheet 6, which corresponds to the bending vibration and generates the sound field. For the vibration plate 5, the area with the largest vibration amplitude is called the anti-node position, and the area with the smallest vibration amplitude is called the node position. The smaller the particle size, the greater the force of the sound field, and the smaller the effect of the gravity component; the larger the particle size, the smaller the force of the sound field, and the greater the effect of the gravity component. Therefore, by adjusting the preset frequency or the inclination angle of the vibration plate 5, the combined effect of the sound field and the gravity component is used to achieve the 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] The present embodiment provides an adjustable control and precision screening device for particulate matter based on a vibration structure, comprising: a container 1, an angle tilting platform 3, a vibration plate 5, a blocking plate 10, a power amplifier 11 and a function generator 12; the angle tilting platform 3 comprises a top surface 4 on a side away from the ground; the vibration plate 5 is parallel to the plane where the top surface 4 is located, and comprises a stacked piezoelectric sheet 6 and a glass plate 7, the side of the piezoelectric sheet 6 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 sheet 6. At least two kinds of particles are placed on the side of the vibration plate 5 away from the angle tilting platform 3, and the sizes of any two particles are different. By adjusting the size of the preset frequency, at least one particle is separated. 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 forces on 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 achieving separation of particles of different sizes; and, smaller particles tend to stay at positions close to anti-nodes. 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, and the stationary position of the smaller particles on the vibration plate 5 can be manipulated to achieve particle regulation.

[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 blocking plate 10, a power amplifier 11, and a function generator 12, wherein:

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

[0069] The angled inclined platform 3 is in contact with the side of the bottom surface 2 away from the ground, and 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 sheet 6 and a glass plate 7. The orthographic projection of the piezoelectric sheet 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 piezoelectric sheet 6 includes a connection area 8 and a non-connection area 9 on the side away from the glass plate 7. The connection area 8 and the non-connection area 9 are arranged in sequence 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 sheet 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 sheet 6 close to the top surface 4 along the extension direction X of the glass plate 7;

[0073] The output end of the function generator 12 is connected to the input end 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 sheet 6; the piezoelectric sheet 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 at least one particle is separated and the position of at least one particle is regulated.

[0075] It should be noted that, in the present embodiment, the piezoelectric sheet 6 is a piezoelectric ceramic transducer. The number of vibration plates 5 may be at least two, and at least two vibration plates 5 are arranged in sequence along the extension direction Y of the top surface 4, and there is no gap between two adjacent vibration plates 5; the present embodiment provides an adjustable control and precision screening device for particulate matter based on a vibration structure, which also includes a soft film, and the soft film covers the side of the glass plate 7 away from the piezoelectric sheet 6, and the orthographic projections of all vibration plates 5 on the plane where the top surface 4 is located overlap with the orthographic projections of the soft film on the plane where the top surface 4 is located; the blocking plate 10 is located on the side of the soft film away from the glass plate 7, and the blocking plate 10 is arranged corresponding to the vibration plate 5. Along the extension direction Y of the top surface 4, all vibration plates 5 overlap, and all blocking plates 10 overlap. Each vibration plate 5 is regarded as a separate unit, and at least two vibration plates 5 are provided, that is, at least two units can perform particle separation or regulation operations at the same time, which can improve efficiency. A soft film is arranged to cover all vibration plates 5, that is, all vibration plates 5 are connected as a whole, and the soft film will not affect the vibration of a single unit after connection. 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 the first preset frequency to gradually increase to the second preset frequency, the first preset frequency is less than the second preset frequency, all particles first move in the direction from the connection area 8 to the non-connection area 9 and then stop;

[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 to regulate the position of at least one particle, a regulation stage is also included;

[0080] The regulation 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 reaching a designated position.

[0082] By setting the vibration plate 5 to be inclined 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 forces on 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 achieving the separation of particles of different sizes; and, smaller particles tend to stay at positions close to the anti-nodes. 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 stationary position of the 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, the polystyrene and silica particles are located at the bottom of the vibrating plate.

[0086] The voltage of the function generator was set to 100 V, and the frequency of the corresponding sinusoidal signal was 4 kHz. At this time, due to the action of local acoustic fluidic force, the particles of polystyrene and silica were 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 was then reduced to 100V, selectively manipulating the large polystyrene particles to roll down while the small silica particles stayed on top of the vibrating plate, separating the two types of particles into different locations.

[0089] In this embodiment, by studying the combined acoustic field on the inclined vibration plate, an acoustic streaming balanced with the weight component is proposed. The particles climb on the vibration plate. Then, due to the difference in the combined action of the acoustic streaming force and the acoustic radiation force, two or more particles are selectively manipulated and separated to different positions. Finally, adjustable separation is achieved by continuously switching the vibration mode of the vibration plate.

[0090] Example 4

[0091] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3A schematic diagram of a flow chart of a method for adjustable control and precise screening of particulate matter based on a vibration structure provided by the present invention, Figure 4 is a force diagram of a particle. Figure 5 is a schematic diagram of the combined force on the particle. Figure 6 is a schematic diagram of another combined force on particles, to illustrate a specific embodiment of a method for adjustable manipulation and precision screening of particle matter based on a vibration structure provided in this embodiment, which is applied to an adjustable manipulation and precision screening device for particle 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 the first preset frequency to gradually increase to the second preset frequency, the first preset frequency is less than the second preset frequency, and all particles first move in the direction 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 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 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 particle falls from the non-connected area to the connected area.

[0094] It should be noted that if the stopping position of the particles stopped on the vibration plate is to be regulated after the screening stage, the regulation stage is also included;

[0095] S103: The regulation 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 in a direction from the connection area to the non-connection area until reaching a designated position.

[0097] It is understandable 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 is adjusted and the preset frequency is adjusted, the resultant force on the particles changes;

[0098] The combined 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 top control surface and the ground is used to change the gravity component received by the particles; adjusting the preset frequency is used to change the acoustic flow force and acoustic radiation force received by the particles. Therefore, adjusting the angle between the top control surface and the ground or adjusting the preset frequency is to change the resultant force received by the particles.

[0100] Reference Figure 4 , Figure 5 and Figure 6 ,exist Figure 4 In the middle, the red a d Represents 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 dashed line represents the acoustic flow force on the particle, the red dashed 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 particles with a radius of the preset length, the red dotted line represents the acceleration of particles with a radius of 1.5 times the preset length, the green dotted line represents the acceleration of particles with a radius of 2 times the preset length, and the purple dotted line represents the acceleration of particles 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 area, the relationship between the fluid and the solid is calculated first, and the calculation is performed in the following manner:

[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 solid structure stress tensor.

[0105] For a two-dimensional sound 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 particle, c p is the sound velocity of the particle.

[0111] According to 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, which can be obtained by Stokes' law and 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, calculated as follows:

[0116] F g =Gsinα

[0117] Among them, F g is the gravity component, G is the 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 increases first 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 as to adjust the gravity component of some particles to be greater than the upward force they receive in the sound field, so that some particles fall and at least one particle is separated; 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 Since the smaller the particle, the greater the force of the sound field, the smaller the particle, the higher the maximum point will be, and it is easier for it to stop at the anti-node. The upward pulling force on the particle will increase with the increase of the excitation amplitude and the particle size, and the corresponding equilibrium domain will become larger. The smaller particles are easier to pull upward. The excitation amplitude corresponds to the frequency of the sinusoidal signal. Therefore, by adjusting the frequency of the sinusoidal signal, the stopping position of the smaller particles can also be adjusted to complete the regulation of the particles.

[0121] It can be seen from the above embodiments that the device for adjustable control 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 an adjustable control and precision screening device for particulate matter based on a vibration structure, comprising: a container, an angle tilting platform, a vibration plate, a blocking plate, a power amplifier and a function generator; the angle tilting platform comprises a top surface on a side away from the ground; the vibration plate is parallel to the plane where the top surface is located, and comprises a stacked piezoelectric sheet and a glass plate, the side of the piezoelectric sheet away from the glass plate is connected to the top surface, and the extension direction of the vibration plate is perpendicular to the extension direction of the top surface; the input end of the power amplifier is connected to the output end of the function generator, and the output end of the power amplifier is connected to the piezoelectric sheet. At least two kinds of particles are placed on the side of the vibration plate away from the angle tilting platform, and the sizes of any two particles are different. By adjusting the size of the preset frequency, at least one particle is separated. 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 forces on 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 separation of particles of different sizes; and, smaller particles tend to stay at positions close to anti-nodes. 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, and the stationary position of the smaller particles on the vibration plate can be manipulated to achieve particle regulation.

[0123] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated 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 will be appreciated by those skilled in the art that the above embodiments may be modified 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 precision screening of particulate matter based on a vibration structure, characterized in that: It includes 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 is in contact with a side of the bottom surface away from the ground, 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, and 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; along 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 sheet, 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 sheet; the piezoelectric sheet 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 at least one of the particles is separated and the position of at least one of the particles is regulated.

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, and there is no interval between two adjacent vibration plates; The device for adjustable manipulation and precision screening of particulate matter based on a vibration structure also includes a soft film, which covers a side of the glass plate away from the piezoelectric sheet, and 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 at 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 precision 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, the first preset frequency is less than the second preset frequency, and all the particles first move in a direction from the connection area to the non-connection area and then stop; The screening stage includes: adjusting the angle between the top surface and the ground until one of the particles 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 of the particles 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 one of the particles 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 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; The preset frequency is adjusted to gradually decrease from the third preset frequency until one of the particles moves in a direction from the connection area to the non-connection area until reaching 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 is adjusted and the preset frequency is adjusted, the resultant force on the particles changes; The resultant force 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 control 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 particle, d is the diameter of the particle, 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 particle, 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 the gravity, and α is the angle between the top surface and the ground.

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