Piezoelectric ceramic driven mechanical vibration device and anti-vibration control method

Abstract

The present invention provides a piezoelectric ceramic-driven mechanical shaking device, comprising a shaking spring, a piezoelectric ceramic, and an inertia balancing device; the piezoelectric ceramic is mounted on the shaking spring; a shaken body is fixedly connected to the shaking spring, and when an alternating voltage is applied to the piezoelectric ceramic, the piezoelectric ceramic can produce torsional shaking; the inertia balancing device is connected below the shaking spring and is configured to generate shaking inertia in the opposite direction of the shaking of the shaken body. The present invention also provides a vibration control method. This solution can reduce or even eliminate vibration in the entire shaking device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration devices, and in particular to a piezoelectric ceramic driven mechanical vibration device and an anti-vibration control method. Background Art

[0002] Conventional piezoelectric ceramic driven mechanical shaking devices generally apply alternating voltage to the piezoelectric ceramic to cause the shaken object to torsionally shake. Although the existing shaking scheme is simple in structure, it has a fatal drawback: the shaken object will generate a torque (such as Figure 4 As shown, the torque is Where M is the torque, I is the moment of inertia, is the angular position), so that the object being shaken needs to be installed on the base to provide a counter-driving force, which will inevitably cause vibration to the installation base due to the presence of the shaking device, and the base needs to be large enough to withstand the shaking of the shaking device; in addition, when multiple shaking devices are used on one device, since the shaking device transmits vibration to the device, the device will also transmit vibration to the shaking device, resulting in shaking coupling between different shaking devices, which will affect the normal operation of the shaking device. Summary of the Invention

[0003] The present invention discloses a piezoelectric ceramic driven mechanical shaking device and an anti-shake control method, which have a simple structure and are easy to operate, and are intended to improve the above-mentioned problems.

[0004] The present invention adopts the following scheme:

[0005] The present application provides a piezoelectric ceramic driven mechanical shaking device, comprising a shaken body, a shaking spring, a piezoelectric ceramic, and further comprising: an inertia balancing device;

[0006] The piezoelectric ceramic is arranged on the shaking spring;

[0007] The shaken body is fixedly connected to the shaking spring and is configured to generate torsional shaking when an alternating voltage is applied to the piezoelectric ceramic;

[0008] The inertia balancing device is connected below the shaking spring and is configured to generate a shaking inertia in the opposite direction of the shaking direction when the shaken body shakes.

[0009] Furthermore, the inertia balancing device includes a balancing block and a balancing spring, the balancing spring is fixed on the shaking spring, and the balancing block is connected to the balancing spring.

[0010] Furthermore, the shake spring further includes an inner ring and an outer ring, a plurality of spokes are evenly arranged between the inner ring and the outer ring of the shake spring, and the piezoelectric ceramic is arranged on two opposite sides of each spoke.

[0011] Furthermore, a balance bar is provided between each two adjacent spokes, and a plurality of the balance bars form the balance spring.

[0012] Furthermore, the balance bar is connected to the inner ring and separated from the outer ring.

[0013] Furthermore, the balancing weight is fixedly connected to the balancing spring.

[0014] Furthermore, the shaking spring and the balancing spring are made of elastic metal material.

[0015] Furthermore, it includes a mounting base, and the mechanical shaking device is installed on the mounting base.

[0016] The present invention also provides an anti-vibration control method, which comprises the following steps:

[0017] S1: applying an excitation signal having the same resonant frequency as that of a mechanical shaking device driven by the piezoelectric ceramic to the piezoelectric ceramic through a shaking controller, so as to cause the shaken object to shake;

[0018] S2: The vibration of the object being shaken stimulates the vibration of the balancing weight under the action of inertia; wherein the phase of the swing of the balancing weight lags behind that of the object being shaken, and the phase difference between the vibration of the object being shaken and the vibration of the balancing weight is 180 degrees;

[0019] S3: By adjusting the inertia of the balancing weight, the torsional moment generated by the vibrated object and the balancing weight is the same.

[0020] Furthermore, the inertia of the balancing weight is adjusted by adjusting the shape or mass of the balancing weight.

[0021] By adopting the above-mentioned technical solution, the present invention can achieve the following technical effects: by setting an inertia balancing device, the vibration of the entire shaking device can be reduced or even eliminated, which can effectively reduce the problems caused by the vibration of the equipment itself and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the exploded structure of a piezoelectric ceramic driven mechanical shaking device according to an embodiment of the present invention;

[0024] Figure 2 1 is a schematic diagram of the overall structure of a piezoelectric ceramic driven mechanical shaking device according to an embodiment of the present invention;

[0025] Figure 3 1 is a schematic structural diagram of a shaking spring of a piezoelectric ceramic-driven mechanical shaking device according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the torque applied to the shaking body of an existing shaking device;

[0027] Figure 5 Schematic diagram of the torque acting on a shaking body and a balancing block of a piezoelectric ceramic driven mechanical shaking device according to an embodiment of the present invention.

[0028] Icons: shaken body 10 , shake spring 20 , spoke 21 , inner ring 22 , outer ring 23 , piezoelectric ceramic 30 , balance bar 40 , balance weight 50 , screw 60 . DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] Example

[0035] Combine Figures 1 to 3 As shown, this embodiment provides a shaking device, including a mounting base and a piezoelectric ceramic driven mechanical shaking device. The piezoelectric ceramic driven mechanical shaking device described herein includes a shaken body 10, a shaking spring 20 and a piezoelectric ceramic 30, and also includes: an inertia balancing device; the piezoelectric ceramic 30 is arranged on the shaking spring 20; the shaken body 10 is connected to the shaking spring 20 and is configured to generate torsional shaking when an alternating voltage is applied to the piezoelectric ceramic; the inertia balancing device is connected below the shaking spring 20 and is configured to generate a shaking inertia in the opposite direction to the shaking direction of the shaken body 10 when the shaken body 10 shakes.

[0036] In this embodiment, the shaken body is driven to shake by the shaking spring 20 and the piezoelectric ceramic 30, which uses the resonator principle. The characteristic of the piezoelectric ceramic 30 is that when a voltage in the same direction is applied to the piezoelectric ceramic 30, that is, a positive voltage is applied to the positive pole, the piezoelectric ceramic 30 extends; if a reverse voltage is applied, that is, a negative voltage is applied to the positive pole, the piezoelectric ceramic 30 shortens. By applying an excitation signal with the same resonant frequency as the shaking device to the piezoelectric ceramic 30, the piezoelectric ceramic 30 causes the side of the spoke to extend or shorten, thereby achieving the shaking of the shaken body. Applying an excitation signal with the same resonant frequency as the shaking device will form a resonance, thereby amplifying the shaking effect. The shaking device here is a shaking system formed by forming multiple resonators in parallel.

[0037] The shaking device is a piezoelectric driven shaking device, and the shaken body 10 can be set as a shaking block. Of course, this is only one embodiment of the shaken body 10. It can also be other objects that need to be shaken. The object that needs to be shaken is fixedly connected to the shaking spring 20.

[0038] The shaking spring 20 is fixedly arranged below the shaken body 10, and is used to drive the shaken body 10 to torsionally shake. The shaking spring 20 here can be set as a flat plate, with an inner ring and an outer ring arranged in the middle, and the area between the inner ring 22 and the outer ring 23 is hollowed out. At the same time, a plurality of spokes 21 evenly distributed around the center of the circle are connected between the inner ring 22 and the outer ring 23, and the spokes 21 connect the inner ring 22 and the outer ring 23. The inner ring 22 of the shaking spring 20 is provided with a screw hole, which is used to be connected to the shaken body 10 by bolts or screws 60. The shaking spring 20 here is made of elastic metal, such as steel, copper, etc., which is an elastic metal. Here, there are 6 spokes 21, and the parameters and quantity of the spokes here can be adjusted as needed.

[0039] The piezoelectric spring driving plate is arranged on both sides of each of the spokes 21. By applying an alternating voltage to the piezoelectric spring driving plate, it deforms, further causing the shaking spring 20 connected thereto to bend, thereby driving the shaken body 10 to torsional shake.

[0040] The inertia balancing device includes a balancing weight 50 and a balancing spring. The balancing spring is fixed to the shaking spring 20. The balancing weight 50 is connected to the balancing spring and is positioned below the shaking spring 20. Specifically, a balancing bar 40 is positioned between the spokes 21 of each of two adjacent shaking springs 20. Multiple balancing bars 40 form the balancing spring. For example, if the shaking spring 20 has six spokes 21, the balancing spring will have six balancing bars 40. Here, the balancing bars 40 are connected to the inner ring 22 and separated from the outer ring 23. The balancing bar described here must be separated from the outer ring 23 to achieve a balancing effect. The function of the balancing bar here is that when the spokes 21 swing under the action of the piezoelectric ceramic 30, the balancing block 50 will also swing under the action of the inertial force, and its swing angle lags behind the shaken body 10. There is a certain difference in phase between the two. When the phase difference is 180 degrees, that is, in the opposite direction, when the torsional torque generated by the shaken body 10 and the balancing block 50 is the same, the two will cancel each other out, which is manifested as the entire shaking device does not transmit vibration to the outside.

[0041] like Figure 5 As shown, in the present invention, the torque generated by the shaken body 10 is M1, and the torque generated by the balancing block 50 is M2, then the torque calculation formula is:

[0042]

[0043] Wherein, I1 is the moment of inertia of the shaken body 10, is the angular position of the shaken body 10; I2 is the moment of inertia of the balancing block 50, is the angular position of the balancing weight 50.

[0044] Here, since the torques generated by the shaken body 10 and the balancing weight 50 are in opposite directions, when M1=M2, the two will cancel each other out, which means that the entire shaking device does not transmit vibration to the outside.

[0045] In the present invention, the balancing bar 40 and the spokes 21 are arranged together in the same annular area, and the balancing weight 50 is also located in the same annular area, which achieves the effect of inertia balance on the one hand and makes the structure more compact on the other hand.

[0046] The balancing spring is also made of an elastic metal material, such as steel, copper, etc., and can be made of the same material as the shaking spring 20. The balancing bar 40 can be integrally formed with the shaking spring 20, or can be welded to the inner ring 22 of the shaking spring 20 later.

[0047] The balancing weight 50 is set to be annular and is located within the range of the spokes 21 and the balancing bar 40. That is, it is located below the area between the inner ring 22 and the outer ring 23 of the shaking spring 20. The balancing weight 50 here can be made of copper. Copper has a larger specific gravity and can have a smaller volume under the same inertia. Of course, the use of other metal materials is also within the protection scope of the present invention. The purpose of the balancing weight 50 here is to obtain inertia. Inertia is positively correlated with radius, that is, under the same mass, the larger the radius, the greater the inertia. Therefore, it is set to be annular, and the circular balancing weight is more stable. Of course, many mass blocks can also be made here and installed on the balancing spring, which can also achieve the effect of storing inertia.

[0048] In the present invention, the shaking device needs to be subjected to shaking control and position feedback. In order to realize stable and continuous operation of the shaking device, it is necessary to continuously input energy into the system to compensate for the energy loss inside the shaking device. This task is completed by the shaking controller, which is achieved by applying an alternating voltage signal to the piezoelectric ceramic 30. The shaking controller must ensure that the applied alternating signal is in phase with the signal of the shaken body 10. Therefore, the shaking device is also equipped with an angle measuring device, which can generally adopt an electromagnetic coil or optical component solution. The shaking controller here can adopt an analog circuit solution or a digital circuit solution. The analog circuit can change the shaking amplitude by adjusting the amplitude of the input alternating signal, and the digital circuit can change the shaking amplitude by adjusting the duty cycle of the input signal. The use of analog circuits or digital circuits is an existing conventional technology and will not be elaborated here.

[0049] The working principle of the present invention is: by applying an excitation signal with the same resonant frequency as the shaking device to the piezoelectric ceramic 30, the shaken body 10 is caused to shake, and the shaking of the shaken body 10 will also excite the shaking of the balance block 50 under the action of inertia. Since the shaking of the two is in opposite directions, the shaking of the balance block 50 will reduce the vibration of the shaken body 10 transmitted to the base due to the shaking. By adjusting the inertia of the balance block 50, this vibration can be reduced to 0, thereby realizing the vibration-free state of the entire shaking device, that is, the mounting base of the piezoelectric ceramic-driven mechanical shaking device will not be affected by the shaking of the shaken body 10 and vibrate.

[0050] In another embodiment, the present invention further provides an anti-vibration control method for a mechanical shaking device driven by piezoelectric ceramics. According to the piezoelectric ceramics driven mechanical shaking device described above, the steps are as follows:

[0051] S1: applying an excitation signal having the same resonant frequency as the mechanical shaking device driven by the piezoelectric ceramic to the piezoelectric ceramic 30 through a shaking controller, so as to cause the shaken body 10 to shake;

[0052] S2: The vibration of the object 10 stimulates the vibration of the balancing weight 50 under the action of inertia; wherein, the phase of the swing of the balancing weight 50 lags behind that of the object 10, and the phase difference between the vibration of the object 10 and the balancing weight 50 is 180 degrees;

[0053] S3: By adjusting the inertia of the balancing weight 50, the torsional moments generated by the shaken body 10 and the balancing weight 50 become the same.

[0054] Here, the size of the inertia can be controlled or adjusted by adjusting the shape or mass of the balancing weight 50 .

[0055] The present invention prevents the shaking device from causing vibrations to the mounting base during shaking, thereby ensuring the stability of the device. Furthermore, the device's service life is increased by preventing other components from becoming loose due to shaking. Furthermore, when multiple shaking devices are used on a single device, the normal operation of the shaking device will not be affected by the coupling of shaking between the different shaking devices. This solution also allows the base of the shaking device to be made smaller, facilitating the implementation of a compact shaking device.

[0056] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A piezoelectric ceramic driven mechanical shaking device, comprising a shaken body, a shaking spring and a piezoelectric ceramic, characterized in that: Also includes: Inertia balancing device; The piezoelectric ceramic is arranged on the shaking spring; The shaken body is fixedly connected to the shaking spring and is configured to generate torsional shaking when an alternating voltage is applied to the piezoelectric ceramic; The inertia balancing device is connected below the shaking spring and is configured to generate inertia in the opposite direction of the shaking when the shaken body shakes.

2. The piezoelectric ceramic driven mechanical shaking device according to claim 1, characterized in that: The inertia balancing device includes a balancing block and a balancing spring. The balancing spring is fixed on the shaking spring, and the balancing block is connected to the balancing spring.

3. The piezoelectric ceramic driven mechanical shaking device according to claim 2, characterized in that: The shaking spring further includes an inner ring and an outer ring. A plurality of spokes are evenly arranged between the inner ring and the outer ring of the shaking spring, and the piezoelectric ceramic is arranged on two opposite sides of each spoke.

4. The piezoelectric ceramic driven mechanical shaking device according to claim 3, characterized in that: The balance spring includes a plurality of balance bars, and the balance bars are arranged between two adjacent spokes.

5. The piezoelectric ceramic driven mechanical shaking device according to claim 4, characterized in that: Each of the balancing bars is connected to the inner ring and separated from the outer ring.

6. The piezoelectric ceramic driven mechanical shaking device according to claim 4, characterized in that: The balancing weight is fixedly connected to the balancing spring.

7. The piezoelectric ceramic driven mechanical shaking device according to claim 4, characterized in that: The shaking spring and the balancing spring are made of elastic metal material.

8. The piezoelectric ceramic driven mechanical shaking device according to claim 1, characterized in that: It also includes a mounting base, and the mechanical shaking device is mounted on the mounting base.

9. A vibration control method using the piezoelectric ceramic driven mechanical shaking device according to any one of claims 2 to 7, characterized in that: The steps are: S1: applying an excitation signal having the same resonant frequency as that of a mechanical shaking device driven by the piezoelectric ceramic to the piezoelectric ceramic through a shaking controller, so as to cause the shaken object to shake; S2: The vibration of the object being shaken stimulates the vibration of the balancing weight under the action of inertia; wherein the phase of the swing of the balancing weight lags behind that of the object being shaken, and the phase difference between the vibration of the object being shaken and the vibration of the balancing weight is 180 degrees; S3: By adjusting the inertia of the balancing weight, the torsional moment generated by the vibrated object and the balancing weight is the same.

10. The anti-vibration control method according to claim 9, characterized in that: The inertia of the balancing weight is adjusted by adjusting the shape or mass of the balancing weight.

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