CN110639785A - Ultrasonic transducer and ultrasonic knife handle - Google Patents
Ultrasonic transducer and ultrasonic knife handle Download PDFInfo
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- 230000010287 polarization Effects 0.000 claims abstract description 40
- 238000009434 installation Methods 0.000 claims abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
- B06B1/0633—Cylindrical array
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Abstract
The invention provides an ultrasonic transducer and an ultrasonic knife handle, wherein the ultrasonic transducer comprises an even number of layers of superposed piezoelectric ceramic sheets, and each layer of piezoelectric ceramic sheet is provided with more than 2 polarization subareas; the piezoelectric ceramic piece comprises two conductive electrodes and a ceramic material laminated between the two conductive electrodes; the polarities of the conducting electrodes close to each other on the polarization subareas corresponding to the upper piezoelectric ceramic piece and the lower piezoelectric ceramic piece are opposite; and the conductive electrode of the piezoelectric ceramic piece is led out through the electrode plate. An ultrasonic knife handle comprises a knife handle body, an amplitude transformer and an ultrasonic transducer; an installation space is formed between the cutter handle body and the amplitude transformer, and the ultrasonic transducer is installed on the amplitude transformer and is positioned in the installation space; the ultrasonic transducer is the ultrasonic transducer. The ultrasonic knife handle can realize complex motion trail and stable vibration.
Description
Technical Field
The invention belongs to the technical field of ultrasonic processing, and particularly relates to an ultrasonic transducer and an ultrasonic knife handle.
Background
At present, for processing some hard and brittle materials, the traditional knife handle has the problems of fast tool loss, low processing efficiency, poor surface quality and the like. The ultrasonic knife handle is a tool for realizing an ultrasonic auxiliary machining process by utilizing high-frequency ultrasonic vibration, a transducer in the ultrasonic knife handle can convert a high-frequency electric signal into high-frequency mechanical vibration, the mechanical vibration is amplified through an amplitude transformer, and the ultrasonic energy is transmitted to the end face of a cutter, so that the high-efficiency and high-quality machining of a hard and brittle material is realized. The ultrasonic knife handle has different output tracks at the end part of the knife under different design and excitation conditions. Most ultrasonic tool shanks vibrate in a pure axial direction to reduce tool wear and improve efficiency, but have limited surface quality improvement and are prone to machining defects at the edges of workpieces.
Disclosure of Invention
The invention aims to provide an ultrasonic transducer and an ultrasonic knife handle, and aims to solve the problems of simple vibration track, limited surface quality improvement and edge processing defect of the ultrasonic knife handle.
The invention provides an ultrasonic transducer, which comprises an even number of layers of superposed piezoelectric ceramic sheets, wherein each layer of piezoelectric ceramic sheet is provided with more than 2 polarization subareas; the piezoelectric ceramic piece comprises two conductive electrodes and a ceramic material laminated between the two conductive electrodes; the polarities of the conducting electrodes close to each other on the polarization subareas corresponding to the upper piezoelectric ceramic piece and the lower piezoelectric ceramic piece are opposite; and the conductive electrode of the piezoelectric ceramic piece is led out through the electrode plate.
Optionally, the number of the polarization partitions on each layer of the piezoelectric ceramic plate is even, and the polarities of the adjacent polarization partitions on each layer of the piezoelectric ceramic plate are opposite.
Optionally, the electrode tabs comprise positive and negative electrode tabs with opposite polarities; conductive electrodes on corresponding polarization subareas above and below the piezoelectric ceramic pieces which are stacked in multiple layers are connected through the positive plate and the negative plate; and the positive plate and the negative plate are spaced.
Optionally, each positive plate is integrally provided as a positive assembly, and each negative plate is integrally provided as a negative assembly.
Optionally, an unpolarized region is disposed between adjacent polarized sectors on each layer of the piezoelectric ceramic sheet, and the adjacent polarized sectors are isolated by the unpolarized region.
Optionally, the piezoelectric ceramic plates are full-circle piezoelectric ceramics, each full-circle piezoelectric ceramic comprises four 90-degree arc piezoelectric ceramics to form a full circle, and the polarities of every two adjacent 90-degree arc piezoelectric ceramics are opposite.
Optionally, a plurality of 90 ° arc piezoelectric ceramics which are correspondingly stacked in position form a piezoelectric ceramics group, and four piezoelectric ceramics groups respectively input four excitation signals.
The invention also provides an ultrasonic knife handle which comprises a knife handle body, an amplitude transformer and an ultrasonic transducer; an installation space is formed between the cutter handle body and the amplitude transformer, and the ultrasonic transducer is installed on the amplitude transformer and is positioned in the installation space; the ultrasonic transducer is the ultrasonic transducer.
Compared with the prior art, the invention realizes the complex motion track of the ultrasonic knife handle by arranging each layer of piezoelectric ceramics in the transducer into even number of polarization subareas and correspondingly inputting even number of different signals and adjusting the frequency and phase difference among the different signals, thereby reducing the surface roughness of a processed workpiece, reducing the processing defect and further improving the processing efficiency. The ultrasonic transducer can generate a complex motion track, and can select a vibration output track according to a processing object and a structure, so that the surface quality is further improved, and the processing defects are reduced. Moreover, the device can be suitable for harsh conditions of high-speed rotation, and has good stability and reliability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic perspective view of an ultrasonic scalpel handle according to a second embodiment of the present invention;
FIG. 2 is a schematic diagram of a partially exploded view of the ultrasonic transducer of FIG. 1;
FIG. 3 is a schematic perspective view of a piezoelectric ceramic of an ultrasonic transducer according to a first embodiment of the present invention;
FIG. 4 is a schematic positive-negative diagram of an electrode input signal of an ultrasonic scalpel handle according to a first embodiment of the present invention;
FIG. 5 is a waveform diagram of an electrode input signal of an ultrasonic tool shank according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a motion trajectory generated by inputting two different signals to electrodes of an ultrasonic scalpel handle according to a first embodiment of the present invention;
FIG. 7 is a schematic half-sectional view of a multilayer piezoelectric ceramic in a first ultrasonic transducer according to the present invention;
fig. 8 is another perspective view of the piezoelectric ceramic of the ultrasonic transducer according to the first embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-ultrasonic knife handle; 11-a tool head; 13-a horn; 15-an ultrasonic transducer; 17-a shank body; 19-rear cover; 151-first piezoelectric ceramic; 152-a second piezoelectric ceramic; 153-a third piezoelectric ceramic; 154-a fourth piezoelectric ceramic; 155-a first electrode sheet; 156-a second electrode sheet; 157-a third electrode sheet; 158-a fourth electrode sheet; 159-a fifth electrode pad; 1551-first left electrode slice; 1552-first right electrode slice; 1561-a second left electrode slice; 1562-a second right electrode slice; 1571-third left electrode pad; 1572-third right electrode pad; 1581-fourth left electrode plate; 1582-fourth right electrode plate; 1591-fifth left electrode pad; 1592-fifth right electrode slice; 251-a first semicircular piezoelectric ceramic; 252-a second semi-circular ring piezoelectric ceramic; 253-a third semicircular ring piezoelectric ceramic; 351-full circular ring piezoelectric ceramics.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-8, the ultrasonic transducer and the ultrasonic scalpel handle provided by the present invention will now be described.
The first embodiment:
the first embodiment of the present invention provides an ultrasonic transducer 15, where the ultrasonic transducer 15 includes a first piezoelectric ceramic 151, a second piezoelectric ceramic 152, a third piezoelectric ceramic 153, a fourth piezoelectric ceramic 154, a first electrode sheet 155, a second electrode sheet 156, a third electrode sheet 157, a fourth electrode sheet 158, and a fifth electrode sheet 159, and two electrode sheets are respectively disposed on the upper and lower surfaces of each piezoelectric ceramic, so that elements in the ultrasonic transducer 15 sequentially include, from top to bottom, the first electrode sheet 155, the first piezoelectric ceramic 151, the second electrode sheet 156, the second piezoelectric ceramic 152, the third electrode sheet 157, the third piezoelectric ceramic 153, the fourth electrode sheet 158, the fourth piezoelectric ceramic 154, and the fifth electrode sheet 159. In the present embodiment, the first electrode sheet 155, the second electrode sheet 156, the third electrode sheet 157, the fourth electrode sheet 158 and the fifth electrode sheet 159 are five identical electrode sheets, and the first piezoelectric ceramic 151, the second piezoelectric ceramic 152, the third piezoelectric ceramic 153 and the fourth piezoelectric ceramic 154 are four identical piezoelectric ceramics. As a modification, the number of the piezoelectric ceramics in the ultrasonic transducer 15 is not limited as long as the number of the piezoelectric ceramics is an even number, and each piezoelectric ceramics is located between two adjacent electrode sheets. Therefore, the ultrasonic transducer provided by the invention comprises an even number of layers of superposed piezoelectric ceramic sheets, wherein each layer of piezoelectric ceramic sheet is provided with more than 2 polarization subareas; the piezoelectric ceramic piece comprises two conductive electrodes and a ceramic material laminated between the two conductive electrodes; the polarities of the conducting electrodes close to each other on the polarization subareas corresponding to the upper piezoelectric ceramic piece and the lower piezoelectric ceramic piece are opposite; and the conductive electrode of the piezoelectric ceramic piece is led out through the electrode plate.
Optionally, the first piezoelectric ceramic 151 is a full circle and includes two polarization sections, each polarization section is a semicircular piezoelectric ceramic, the piezoelectric ceramics of two different polarization sections are integrally connected, one polarization section is a positive electrode (+), the other polarization section is a negative electrode (-), the other piezoelectric ceramics inside the ultrasonic transducer 15 are the same as the first piezoelectric ceramics 151, the polarization subareas between two adjacent piezoelectric ceramics correspond in position, the polarities of the adjacent polarization subareas on each layer of the piezoelectric ceramic sheet are opposite, namely, two polarization subareas on the upper surface of the same piezoelectric ceramic are respectively a positive electrode and a negative electrode, two polarization subareas on the lower surface are correspondingly respectively a negative electrode and a positive electrode, at the corresponding position, the two polarization subareas on the upper surface of the piezoelectric ceramics of the adjacent layer are respectively a negative electrode and a positive electrode, and the two polarization subareas on the lower surface are respectively a positive electrode and a negative electrode. Therefore, the number of the polarization subareas on each layer of the piezoelectric ceramic sheet of the ultrasonic transducer is even, the polarities of the adjacent polarization subareas on each layer of the piezoelectric ceramic sheet are opposite, and the shape of the piezoelectric ceramic of each layer is not limited. That is to say, the piezoelectric ceramic can be in other shapes besides a full circle shape, as long as the piezoelectric ceramic is ensured to comprise two integrally connected polarization subareas, and the vibration frequency and the amplitude of the ultrasonic knife handle can be more stable while realizing a complex motion track through the integrally connected piezoelectric ceramic.
Referring to fig. 4, the first piezoelectric ceramic 151, the second piezoelectric ceramic 152, the third piezoelectric ceramic 153, and the fourth piezoelectric ceramic 154 are sequentially stacked up and down, and the first electrode sheet 155 includes two half electrode sheets, i.e., a first left electrode sheet 1551 and a first right electrode sheet 1552; the second electrode sheet 156 includes two half electrode sheets, i.e., a second left electrode sheet 1561, a second right electrode sheet 1562; the third electrode piece 157 comprises two half electrode pieces, namely a third left electrode piece 1571 and a third right electrode piece 1572; the fourth electrode sheet 158 includes two half electrode sheets, namely a fourth left electrode sheet 1581 and a fourth right electrode sheet 1582; the fifth electrode sheet 159 includes two half electrode sheets, a fifth left electrode sheet 1591 and a fifth right electrode sheet 1592. The first left electrode plate 1551, the second left electrode plate 1561, the third left electrode plate 1571, the fourth left electrode plate 1581 and the fifth left electrode plate 1591 are located on the left sides of the plurality of piezoelectric ceramics, the five left electrode plates input first excitation signals a-b together, the first left electrode plate 1551 is connected with the positive electrode, the second left electrode plate 1561 is connected with the negative electrode, the third left electrode plate 1571 is connected with the positive electrode, the fourth left electrode plate 1581 is connected with the negative electrode, and the fifth left electrode plate 1591 is connected with the positive electrode. The first right electrode plate 1552, the second right electrode plate 1562, the third right electrode plate 1572, the fourth right electrode plate 1582 and the fifth right electrode plate 1592 are located on the right sides of the plurality of piezoelectric ceramics, the five right electrode plates input a second excitation signal c-d together, the first right electrode plate 1552 is connected with the negative electrode, the positive electrode of the second right electrode plate 1562, the negative electrode of the third right electrode plate 1572, the positive electrode of the fourth right electrode plate 1582 and the negative electrode of the fifth right electrode plate 1592. Therefore, the electrode plates arranged on each laminated piezoelectric ceramic plate provided by the invention comprise positive plates and negative plates with opposite polarities; conductive electrodes on corresponding polarization subareas above and below the multilayer superposed piezoelectric ceramic sheets are connected through the positive plate and the negative plate; and the positive plate and the negative plate are spaced. Optionally, each positive plate is integrally provided as a positive assembly, and each negative plate is integrally provided as a negative assembly.
Optionally, the first excitation signal a-b is sin (2 π f1+ α 1) and the second excitation signal c-d is sin (2 π f2+ α 2), wherein the difference between α 1 and α 2 may be 0 or 1/4 π or 1/2 π or 3/4 π or π. It should be noted that the difference between α 1 and α 2 is only an example here, and the difference between α 1 and α 2 may be anywhere from 0 to pi, and is not limited here. In addition, the ratio between f1 and f2 is not limited in particular, and for example, the ratio between f1 and f2 may be 1:1, 1:2, 1:3, 2:3 or other ratios as long as the user requirements are met. The waveforms of the first and second excitation signals are not limited, and may be sine waves, square waves, or other waveforms.
Referring to fig. 7, in a schematic half-section view of each layer of piezoelectric ceramic in the ultrasonic transducer according to the first embodiment of the present invention, each semicircular piezoelectric ceramic group includes a first semicircular piezoelectric ceramic 251, a second semicircular piezoelectric ceramic 252, a third semicircular piezoelectric ceramic 253, a fourth semicircular piezoelectric ceramic 254, and five electrode pads, each semicircular piezoelectric ceramic is located between two adjacent electrode pads, two semicircular piezoelectric ceramic groups jointly form a whole-circle piezoelectric ceramic and electrode pad assembly inside the ultrasonic transducer, and the two semicircular piezoelectric ceramic groups are respectively connected to a first excitation signal and a second excitation signal, which are two excitation signals in total.
It can be understood that the piezoelectric ceramics of fig. 7 are only one of the above-mentioned arrangements, please refer to fig. 8, each piezoelectric ceramics of the ultrasonic transducer in the first embodiment of the present invention may further include four polarization partitions, such as a full-circle piezoelectric ceramics 351 shown in fig. 8, which includes four polarization partitions, each signal partition is a 90 ° arc piezoelectric ceramics, two opposite polarization partitions are positive electrodes (+), and the other opposite polarization partition is a negative electrode partition (-), the other piezoelectric ceramics inside the ultrasonic transducer are the same as the full-circle piezoelectric ceramics 351, the polarities of every two adjacent 90 ° arc piezoelectric ceramics in each full-circle piezoelectric ceramics are opposite, and the four 90 ° arc piezoelectric ceramics are integrally connected to form a full circle. The piezoelectric ceramic units are stacked correspondingly in position and form a piezoelectric ceramic unit, four excitation signals are respectively input into the four piezoelectric ceramic units, and the four 90-degree arc piezoelectric ceramic units are connected with four different signals. In the present embodiment, the ultrasonic transducers are divided into 4 piezoelectric ceramic groups; 4 excitation signals with different frequencies and phase differences are input into the 4 piezoelectric ceramic groups respectively. In addition, the 4 input excitation signals are not limited to sine waves, but may be square waves or other waveform signals.
Second embodiment:
the second embodiment of the present invention provides an ultrasonic tool shank 1, and the ultrasonic tool shank 1 includes a tool head 11, a horn 13, an ultrasonic transducer 15, a shank main body 17, and a rear cover 19. The tool head 11 is located at one end of the handle body 17, the amplitude transformer 13 is located between the tool head 11 and the handle body 17, the tool head 11 is used for connecting different cutters, one end of the tool head 11 is connected with the cutters, the other end of the tool head 11 is connected with the amplitude transformer 13, and the amplitude transformer 13 is used for adjusting the amplitude of ultrasonic vibration, that is, the amplitude of vibration of the ultrasonic handle 1. The handle body 17 is connected to the tail of the horn 13, an installation space is formed between the handle body 17 and the horn 13, the transducer is arranged in the installation space, the ultrasonic transducer 15 is installed on the horn 13, the electrode plate on the uppermost layer of the ultrasonic transducer 15 abuts against the rear cover 19, and in particular, for the description of the ultrasonic transducer 15, reference may be made to the description of the foregoing first embodiment.
In a second embodiment, a method for controlling an ultrasonic scalpel handle comprises the following steps: polarization subareas corresponding to the upper part and the lower part of the overlapped even-numbered piezoelectric ceramic sheets are used as piezoelectric ceramic groups; the ultrasonic transducer is divided into piezoelectric ceramic groups corresponding to the number of the polarization subareas; excitation signals with different frequencies are input to each piezoelectric ceramic group. Excitation signals with different frequencies and phase differences are input to each piezoelectric ceramic group. For example, two groups of excitation signals exist in the ultrasonic transducer 15 in the ultrasonic tool handle 1, and each layer of the piezoelectric ceramic sheet is provided with 2 polarization zones; the ultrasonic transducer is divided into two piezoelectric ceramic groups; the two piezoelectric ceramic groups are respectively input with a first excitation signal and a second excitation signal which have different frequencies and phase difference.
Optionally, a frequency ratio between the first excitation signal and the second excitation signal is within plus or minus 10% of a preset ratio, where the preset ratio is 1:1, 1:2, 1:3, or 2: 3. Further, the frequency ratio between the first excitation signal and the second excitation signal is within plus or minus 10% of a preset ratio, and the phase difference value between the first excitation signal and the second excitation signal is 0, 1/4 pi, 1/2 pi, 3/4 pi or pi.
Optionally, a frequency ratio of the first excitation signal to the second excitation signal is 1:1, and a phase difference value between the first excitation signal and the second excitation signal is 0, pi, or between 0 and pi.
Optionally, a frequency ratio between the first excitation signal and the second excitation signal is 1:2, 1:3, or 2:3, and a phase difference value between the first excitation signal and the second excitation signal is 0, 1/2 pi, or pi.
It should be noted that the preset ratio may also be other values, and the phase difference value between the first excitation signal and the second excitation signal may also be other differences, which is not limited herein. Alternatively, the excitation signal input by each set of polarization sections may be a sine-cosine wave, a square wave or other waveform signal, which is not limited herein.
Illustratively, as shown in FIG. 6, the first stimulus signal a-b is sin (2 π f1+ α 1), the second stimulus signal c-d is sin (2 π f2+ α 2), when f 1: when f2 is 1:1 and the difference between α 1 and α 2 is 0 or pi, the motion trajectory of the ultrasonic scalpel handle 1 is a straight line; when f 1: when f2 is 1:1 and the difference between α 1 and α 2 is 1/4 pi or 3/4 pi, the motion trajectory of the ultrasonic knife handle 1 is an ellipse, and when f 1: f2 is 1:1 and the difference between α 1 and α 2 can also be other phase differences between 1/4 pi and 3/4 pi; when f 1: when f2 is 1:1 and the difference between α 1 and α 2 is 1/2 pi, the motion trajectory of the ultrasonic knife handle 1 is a circle, and when the motion trajectory is a circle, the ultrasonic knife handle 1 reaches an optimal trajectory; when f 1: when f2 is 1:2 or 1:3 or 2:3 and the difference between α 1 and α 2 is 0 or 1/4 pi or 1/2 pi or 3/4 pi or pi, the motion trajectory of the ultrasonic scalpel handle 1 is a complex curve. It should be noted that the motion trajectories of the ultrasonic knife handle 1 corresponding to the first excitation signal and the second excitation signal are only illustrated here by way of example, and the present solution is not limited thereto, and as for the specific setting of the excitation signal, reference may be made to the foregoing description about the ultrasonic transducer, since the excitation signal of the ultrasonic transducer 15 input into the ultrasonic knife handle 1 is different, the ultrasonic transducer 15 is driven to generate corresponding vibration, so that the ultrasonic knife handle 1 has different motion trajectories, which is not necessarily described here.
In another embodiment, the ultrasound transducer is divided into 4 piezoelectric ceramic groups; 4 excitation signals with different frequencies and phase differences are input into the 4 piezoelectric ceramic groups respectively. It should be noted that, in addition to the 4 excitation signals with different frequencies and phase differences, the 4 piezoelectric ceramic groups may also be input with 4 excitation signals with different frequencies and no phase differences, or input with 4 excitation signals with the same frequency and phase differences, and the specific example is not limited herein. The excitation signal input by each group of polarization sections is a sine cosine wave or a square wave, and of course, other waveform signals may also be used, which are not illustrated here. When 4 excitation signals exist in the ultrasonic transducer 15 in the ultrasonic knife handle 1, the ultrasonic knife handle 1 also has a corresponding motion track, in addition, when 4 excitation signals exist in the ultrasonic transducer 15 in the ultrasonic knife handle 1, the working process can correspondingly refer to the relevant description when 2 excitation signals exist in the ultrasonic transducer 15, and the ultrasonic transducer 15 is driven to generate corresponding vibration by the difference of the 4 excitation signals input into the ultrasonic transducer 15 in the ultrasonic knife handle 1, so that the ultrasonic knife handle 1 has different motion tracks, and the description is not necessarily developed.
Compared with the prior art, the invention realizes the complex motion track of the ultrasonic knife handle by arranging each layer of piezoelectric ceramics in the transducer into even number of polarization subareas and correspondingly inputting even number of different signals and adjusting the frequency and phase difference among the different signals, thereby reducing the surface roughness of a processed workpiece, reducing the processing defect and further improving the processing efficiency. The ultrasonic transducer can generate a complex motion track, and can select a vibration output track according to a processing object and a structure, so that the surface quality is further improved, and the processing defects are reduced. Moreover, the device can be suitable for harsh conditions of high-speed rotation, and has good stability and reliability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An ultrasonic transducer is characterized by comprising an even number of layers of superposed piezoelectric ceramic sheets, wherein each layer of piezoelectric ceramic sheet is provided with more than 2 polarization subareas;
the piezoelectric ceramic piece comprises two conductive electrodes and a ceramic material laminated between the two conductive electrodes;
the polarities of the conducting electrodes close to each other on the polarization subareas corresponding to the upper piezoelectric ceramic piece and the lower piezoelectric ceramic piece are opposite; and the conductive electrode of the piezoelectric ceramic piece is led out through the electrode plate.
2. The ultrasonic transducer according to claim 1, wherein the number of the polarization sections on each layer of the piezoelectric ceramic sheet is even, and the polarities of the adjacent polarization sections on each layer of the piezoelectric ceramic sheet are opposite.
3. The ultrasonic transducer according to claim 1, wherein said electrode tabs comprise positive and negative electrode tabs of opposite polarity; conductive electrodes on corresponding polarization subareas above and below the piezoelectric ceramic pieces which are stacked in multiple layers are connected through the positive plate and the negative plate; and the positive plate and the negative plate are spaced.
4. The ultrasonic transducer according to claim 3, wherein each of said positive electrode sheets is integrally provided as a positive electrode assembly, and each of said negative electrode sheets is integrally provided as a negative electrode assembly.
5. The ultrasonic transducer according to claim 1 wherein each layer of said piezoelectric ceramic sheet has an unpolarized region disposed between adjacent polarized sectors, adjacent polarized sectors being separated by said unpolarized region.
6. The ultrasonic transducer of any one of claims 1-5, wherein: the piezoelectric ceramic pieces are full-circle piezoelectric ceramics, each full-circle piezoelectric ceramic comprises four 90-degree arc piezoelectric ceramics to form a full circle, and the polarities of every two adjacent 90-degree arc piezoelectric ceramics are opposite.
7. The ultrasonic transducer of claim 6, wherein: a plurality of 90-degree arc piezoelectric ceramics which are correspondingly overlapped in position form a piezoelectric ceramic group, and four excitation signals are respectively input into the four piezoelectric ceramic groups.
8. An ultrasonic knife handle comprises a knife handle body, an amplitude transformer and an ultrasonic transducer; an installation space is formed between the cutter handle body and the amplitude transformer, and the ultrasonic transducer is installed on the amplitude transformer and is positioned in the installation space;
the method is characterized in that: the ultrasonic transducer is the ultrasonic transducer of any one of claims 1-5.
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| CN114952410A (en) * | 2022-06-08 | 2022-08-30 | 广东工业大学 | An intelligent movable ultrasonic tool holder tool magazine |
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