Ultrasonic transducer assembly and ultrasonic knife handle

Abstract

The utility model provides an ultrasonic transducer assembly and an ultrasonic knife handle, and belongs to the field of transducer structures. The ultrasonic transducer assembly comprises a piezoelectric ceramic piece and an electric field generating structure for providing an electric field for the piezoelectric ceramic piece, the piezoelectric ceramic piece comprises two or more than two piezoelectric ceramic units subjected to polarization processing, and after the electric field is applied, the piezoelectric ceramic units of the piezoelectric ceramic piece act together, so that the piezoelectric ceramic pieces can generate the electric field. And the bending or twisting movement of the ultrasonic transducer assembly is realized. The ultrasonic cutter handle has the advantages that pure torsional vibration and bending vibration of the ultrasonic cutter handle can be achieved, and specific precision machining requirements can be met.

Description

Technical Field

[0001] The utility model relates to the field of transducer structures, in particular to an ultrasonic transducer component, and also to an ultrasonic knife handle comprising the ultrasonic transducer component. Background Art

[0002] For high-end difficult-to-process materials such as hard and brittle materials, titanium alloys and stainless steel, conventional processing technology can no longer meet the market's requirements for mass production, and there are problems such as poor processing surface quality, low efficiency, and short tool life. In order to solve the above problems, the commonly used technical solution is to adopt new special processing technology, such as ultrasonic processing. The principle of ultrasonic vibration processing is to apply micron-level ultrasonic frequency vibration to the tool or workpiece, and control its vibration frequency, vibration amplitude and vibration direction, so that the processing tool and the workpiece will produce periodic high-frequency separation, thereby greatly improving the machinability of the material. At present, ultrasonic vibration processing technology has been widely used in processing fields such as cutting of difficult-to-process materials in the aviation field, processing of brittle materials for 3C products, anti-fatigue surface strengthening, and minimally invasive surgery of living biological tissues.

[0003] At present, ultrasonic tool holders can achieve longitudinal vibrations that are the same or opposite to the direction of the electric field. When torsional vibration is required, it is usually achieved by opening a series of spiral grooves on the amplitude transformer based on the longitudinal vibration of the piezoelectric ceramic. Since this type of vibration is based on longitudinal vibration, when the amplitude transformer vibrates torsional along the spiral groove, it is also accompanied by longitudinal vibration of the amplitude transformer, and vibration modes such as pure torsional vibration and bending vibration cannot be achieved, thereby failing to meet specific processing requirements. Utility Model Content

[0004] In order to solve the problem that vibration modes such as pure torsional vibration and bending vibration cannot be realized in the prior art, the utility model provides an ultrasonic transducer assembly and also provides an ultrasonic tool handle including the ultrasonic transducer assembly.

[0005] The utility model includes a piezoelectric ceramic sheet and an electric field generating structure for providing an electric field for the piezoelectric ceramic sheet. The piezoelectric ceramic sheet includes two or more piezoelectric ceramic units that have been polarized. After the electric field is applied, the piezoelectric ceramic units of the piezoelectric ceramic sheet work together to achieve bending or torsional movement of the ultrasonic transducer assembly.

[0006] Furthermore, the number of the piezoelectric ceramic sheets is more than one and is stacked. When the number of the piezoelectric ceramic sheets is more than two, each piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic units, and the polarization directions of the piezoelectric ceramic units at corresponding positions of each piezoelectric ceramic sheet are the same.

[0007] Furthermore, there are two piezoelectric ceramic sheets, namely a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet. The first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are arranged opposite to each other and are each provided with a plurality of piezoelectric ceramic units that have been polarized. The piezoelectric ceramic units of the first piezoelectric ceramic sheet and the piezoelectric ceramic units of the second piezoelectric ceramic sheet are arranged in corresponding positions in pairs, wherein after applying an electric field, the vibration states of the two piezoelectric ceramic units at corresponding positions are the same.

[0008] Furthermore, the electric field generating structure comprises a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet is arranged between the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet.

[0009] Furthermore, the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are in the shape of a hollow ring, and both piezoelectric ceramic sheets are surrounded by a plurality of piezoelectric ceramic units.

[0010] Furthermore, the polarization direction of the piezoelectric ceramic unit includes the same direction as the electric field direction, the opposite direction to the electric field direction, or the perpendicular direction to the electric field direction, and is tangent to the outer periphery of the piezoelectric ceramic sheet.

[0011] The utility model also provides an ultrasonic knife handle including the ultrasonic transducer assembly, wherein the ultrasonic knife handle comprises a knife handle body and an amplitude rod connected to the knife handle body, and the ultrasonic transducer assembly is arranged at one end of the amplitude rod close to the knife handle body. After an electric field is applied, the ultrasonic transducer assembly bends or twists, so that the ultrasonic knife handle realizes bending or torsional vibration.

[0012] Furthermore, the handle body is provided with a mounting cavity near the front end of the amplitude transformer, and the ultrasonic transducer assembly is arranged in the mounting cavity.

[0013] Furthermore, the ultrasonic shank further comprises a matching block disposed on the horn, and the matching block presses the ultrasonic transducer assembly onto the horn.

[0014] Furthermore, the ultrasonic shank further comprises a wireless transmission module for supplying power to the ultrasonic transducer assembly; the wireless transmission module is arranged on the shank body, and the positive and negative electrodes are respectively connected to the electric field generating structure via wires.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model divides the piezoelectric ceramic sheet into different piezoelectric ceramic units, and only needs to perform corresponding polarization treatment on the different piezoelectric ceramic units. By controlling the motion state of different piezoelectric ceramic units on the piezoelectric ceramic sheet, vibration modes such as pure torsional vibration or bending vibration can be achieved.

[0017] The utility model can drive the horn to vibrate accordingly without any improvement on the horn structure, is compatible with the ultrasonic tool holder in the prior art, has a wide range of applications, and can meet various precision machining requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of an embodiment of an ultrasonic tool handle of the utility model;

[0020] Figure 2 for Figure 1 Axial section through the middle;

[0021] Figure 3-5 This is a schematic structural diagram of a first embodiment of the arrangement of polarization direction and electric field direction of the first piezoelectric ceramic sheet of the utility model;

[0022] Figure 6 This is a schematic diagram of the vibration direction of the ultrasonic tool handle in the first embodiment;

[0023] Figure 7-9 This is a schematic structural diagram of a second embodiment of the arrangement of the polarization direction and electric field direction of the first piezoelectric ceramic sheet of the utility model;

[0024] Fig.10 This is a schematic diagram of the vibration direction of the ultrasonic tool handle in the second embodiment;

[0025] Figure 11-13 It is a structural schematic diagram of the third embodiment of the arrangement of the polarization direction and the electric field direction of the first piezoelectric ceramic sheet of the utility model;

[0026] Fig.14 This is a schematic diagram of the vibration direction of the ultrasonic tool handle in the third embodiment;

[0027] Fig.15 This is a schematic structural diagram of another embodiment of the ultrasonic tool handle of the utility model;

[0028] Among them, 1-handle body, 2-wireless transmission module, 3-matching block, 4-negative electrode sheet, 5-piezoelectric ceramic sheet, 6-positive electrode sheet, 7-wire, 8-bolt, 9-amplifier, 901-extension end, 10-tool head, 11-installation cavity, 100-first ultrasonic transducer module, 101-second piezoelectric ceramic sheet, 102-positive electrode sheet, 103-first piezoelectric ceramic sheet, 104-negative electrode sheet, 200-second ultrasonic transducer module. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown in the figure, as an embodiment of the utility model, the ultrasonic knife handle of this example includes a knife handle body 1, a horn 9 connected to the knife handle body 1, an ultrasonic transducer assembly is fixed to the rear end of the horn 9, and a tool head 10 is fixed to the front end. The knife handle body 1 of this example is provided with a mounting cavity 11 near the front end of the horn 9, the ultrasonic transducer assembly is arranged in the mounting cavity 11, and an extension end 901 for mounting the horn 9 and sealing the mounting cavity is provided around the rear end of the horn 9.

[0034] In this example, in order to fix the ultrasonic transducer assembly, a matching block 3 matching the size of the ultrasonic transducer assembly is additionally provided, a first mounting hole is provided in the middle of the matching block 3, a second mounting hole is provided in the middle of the horn 9, and the ultrasonic transducer assembly is provided with a hollow portion, one end of the bolt 8 passes through the first mounting hole of the matching block 3 and the hollow portion of the ultrasonic transducer assembly respectively, and then is fixed in the second mounting hole, so that the ultrasonic transducer assembly is pressed between the matching block 3 and the horn 9 through the matching block 3.

[0035] like Figure 2 As shown, the ultrasonic transducer assembly of this example includes a piezoelectric ceramic sheet 5 and an electric field generating structure for providing an electric field for the piezoelectric ceramic sheet 5. The electric field generating structure of this example is a positive electrode sheet 6 and a negative electrode sheet 4, which are connected to a wireless transmission module 2 as a power supply structure through a wire 7. The piezoelectric ceramic sheet 5 includes more than two polarized piezoelectric ceramic units. After the electric field is applied, the piezoelectric ceramic units of the piezoelectric ceramic sheet work together to realize the bending or torsional movement of the ultrasonic transducer assembly.

[0036] Preferably, in this example, a wireless transmission module is arranged on the handle body 1, and the positive and negative poles of the wireless transmission module are respectively connected to the positive electrode sheet 6 and the negative electrode sheet 4 to provide energy for the ultrasonic transducer assembly. The wireless connection mode makes the operation more convenient. Of course, this example can also be set to a wired electrical connection mode.

[0037] The working principle of the utility model is:

[0038] The wireless transmission module 2 provides energy for the ultrasonic transducer assembly, which can convert electrical energy into high-frequency mechanical vibrations. The vibrations are then transmitted to the tool head 10 through the amplification effect of the amplitude transformer 9. According to the different polarization directions of the piezoelectric ceramic units of the piezoelectric ceramic sheet 5, corresponding vibration modes can be generated on the tool head.

[0039] The polarization direction of the piezoelectric ceramic unit includes the same direction as the electric field, the opposite direction to the electric field, or the perpendicular direction to the electric field, and is tangent to the periphery of the piezoelectric ceramic sheet. The piezoelectric ceramic unit can also be set to a polarization direction in other directions as required. By setting the piezoelectric ceramic unit in the piezoelectric ceramic sheet 5 to different polarization directions, the ultrasonic knife handle is driven to vibrate differently. This example uses an embodiment to illustrate the relationship between the motion state of the ultrasonic transducer assembly and the vibration of the ultrasonic knife handle.

[0040] Example 1-1

[0041] like Figure 3-Figure 5 As shown, the piezoelectric ceramic sheet 5 of the ultrasonic transducer assembly of this example can be enclosed by piezoelectric ceramic units divided into two, four, or six parts. After polarization treatment, all piezoelectric ceramic units of the piezoelectric ceramic sheet 5 have the same polarization direction, which is the same as the direction of the electric field. When an electric field in a positive direction is applied, the piezoelectric ceramic sheet 5 will stretch along the polarization direction; when an electric field in a reverse direction is applied, the piezoelectric ceramic sheet 5 will shorten in a direction opposite to the polarization direction, so that the ultrasonic knife handle, driven by the piezoelectric ceramic sheet 5, vibrates in the longitudinal direction, as shown in FIG. Figure 6 As shown,

[0042] This embodiment is a vibration mode that can be achieved in the prior art. Preferably, this embodiment can also achieve pure torsional and pure bending vibrations.

[0043] Example 1-2

[0044] like Figure 7-Figure 9 As shown, the piezoelectric ceramic sheet 5 of the ultrasonic transducer assembly of this example is surrounded by piezoelectric ceramic units divided into two, four, and six parts. After all the piezoelectric ceramic units of the piezoelectric ceramic sheet 5 are polarized, the polarization direction of half of the piezoelectric ceramic units is the same as the direction of the electric field, and the polarization direction of the other half of the piezoelectric ceramic units is opposite to the direction of the electric field. When an electric field in the positive direction is applied, the piezoelectric ceramic units in the piezoelectric ceramic sheet 5 with the same direction as the electric field will stretch along the polarization direction, while the piezoelectric ceramic units in the opposite direction to the electric field will be compressed along the polarization direction, so that one side of the piezoelectric ceramic unit 5 is stretched and the other side is compressed; similarly, when an electric field in the reverse direction is applied, the piezoelectric ceramic units in the piezoelectric ceramic sheet 5 with the same direction as the reverse electric field will stretch along the polarization direction, while the piezoelectric ceramic units in the opposite direction to the reverse electric field will be compressed along the polarization direction, so that one side of the piezoelectric ceramic unit 5 is stretched and the other side is compressed. At this time, the ultrasonic shank is driven by the ultrasonic transducer assembly and the vibration direction is bending vibration, as shown in FIG. Fig.10 shown.

[0045] Examples 1-3

[0046] like Figure 11-13 As shown, the piezoelectric ceramic sheet 5 of the ultrasonic transducer assembly in this example is enclosed by piezoelectric ceramic units divided into two, four, and six parts. After the polarization treatment, the polarization direction of all the piezoelectric ceramic units of the piezoelectric ceramic sheet 5 is perpendicular to the direction of the electric field, and they are all arranged clockwise along the peripheral tangent direction of the piezoelectric ceramic sheet 5. When an electric field perpendicular to the polarization direction of the ultrasonic transducer assembly is applied, the piezoelectric ceramic units of the piezoelectric ceramic sheet 5 will deform clockwise along the polarization direction. At this time, the ultrasonic knife handle is driven by the ultrasonic transducer assembly and vibrates in a torsional vibration direction, as shown in FIG. Fig.14 shown.

[0047] Of course, the piezoelectric ceramic sheet 5 of this example can preferably be divided into 3-12 piezoelectric ceramic units. The more piezoelectric ceramic units are divided, the better the directionality of vibration control. The piezoelectric ceramic sheet 5 of this example not only supports an even number of piezoelectric ceramic units, but can also be enclosed by an odd number of piezoelectric ceramic units. For example, if one of the piezoelectric ceramic units of the piezoelectric ceramic sheet 5 in Example 1-1 is divided into two equal parts, it becomes enclosed by three piezoelectric ceramic units. It can also be divided into an odd number of equal parts according to needs.

[0048] Example 2

[0049] As the second embodiment of the utility model, the number of piezoelectric ceramic sheets 5 in the ultrasonic transducer assembly of this example can be 2 or more stacked arrangements. When the number of the piezoelectric ceramic sheets is more than two, each piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic units, and the polarization directions of the piezoelectric ceramic units at the corresponding positions of each piezoelectric ceramic sheet are the same. The motion states of the piezoelectric ceramic units of each piezoelectric ceramic sheet are superimposed in the same direction to achieve a greater vibration effect. The number of piezoelectric ceramic units of each piezoelectric ceramic sheet 5 can be the same or different.

[0050] Example 3

[0051] As the third embodiment of the present utility model, in this example, the ultrasonic transducer assembly is modularly arranged, the number of piezoelectric ceramic sheets 5 is an even number, and multiple piezoelectric ceramic sheets 5 are arranged opposite to each other in pairs to form a piezoelectric ceramic module. The ultrasonic transducer assembly is composed of more than one group of stacked piezoelectric ceramic modules.

[0052] Example 3-1

[0053] like Fig.15 As shown, the ultrasonic transducer assembly of this example is a stacked arrangement of two ultrasonic ring energy modules, namely a first ultrasonic transducer module 100 and a second ultrasonic transducer module 200, wherein the two ultrasonic transducer assemblies are fixed to the middle of the rear end of the amplitude transformer through a matching block 3 and a bolt 8 at the negative end of the second ultrasonic ring energy module 200, as a power source for driving the amplitude transformer to vibrate.

[0054] The negative electrode sheet 104 in the first ultrasonic transducer module 100 of this example can provide negative power for the two groups of ultrasonic transducer components, and the positive electrode sheet is fixed between the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 to provide positive power.

[0055] The first piezoelectric ceramic module 100 includes a second piezoelectric ceramic sheet 101 and a first piezoelectric ceramic sheet 103 which are stacked, and a positive electrode sheet 102 which is arranged between the second piezoelectric ceramic sheet 101 and the first piezoelectric ceramic sheet 103 . The negative electrode sheet 104 is common to all piezoelectric ceramic modules.

[0056] The positive electrode sheet 102 of this example is arranged between the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101. In this example, since the materials of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 are insulators, there is no need to set up an additional insulating structure, which facilitates the arrangement of the positive electrode sheet 102. In addition, since the materials of the bolts 8 and the like are all iron, they can transmit electrical energy. Therefore, only one negative electrode sheet 4 needs to be arranged to connect to the power supply ground, and then all piezoelectric ceramic modules can be connected to the negative pole of the power supply through the bolts 8, the amplitude rod 9 and other structures. Therefore, the structure of the utility model does not need to consider the insulation problem of the bolts and the like as conductors. Compared with the existing method of arranging the positive electrode sheet and the negative electrode sheet of the two piezoelectric ceramic sheets respectively, the whole structure is simpler and safer, which is conducive to improving the installation efficiency and safety performance of the product.

[0057] It is preferred that the shape of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 in this example is a hollow ring, which is conducive to the fixing of the matching block 3 and the bolt 8 and the control of the vibration state. The number of piezoelectric ceramic units of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 is an even number, such as 2, 4, 6, 8, 12, etc., and the even number is evenly arranged in the circumference, which is convenient for controlling the motion state of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101. The more piezoelectric ceramic units that divide the annular piezoelectric ceramic sheet into equal parts, the closer its shape is to a rectangle, the easier it is to control the polarization direction, and the more accurate the vibration of the ultrasonic shank is. Considering the processing cost, it is preferred that the number of piezoelectric ceramic units of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 in this example is 2-12.

[0058] The second piezoelectric ceramic unit 200 of this example is also provided with two piezoelectric ceramic sheets arranged opposite to each other, and a positive electrode sheet is fixed between the two piezoelectric ceramic sheets.

[0059] In this example, the piezoelectric ceramic units of the first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 are respectively surrounded by equally divided piezoelectric ceramic units. The first piezoelectric ceramic sheet 103 and the second piezoelectric ceramic sheet 101 are arranged opposite to each other. The piezoelectric ceramic units of the first piezoelectric ceramic sheet 103 and the piezoelectric ceramic units of the second piezoelectric ceramic sheet 101 are arranged at corresponding positions, that is, they are respectively formed into a number of piezoelectric ceramic unit pairs in pairs. After the electric field is applied, the motion states of the piezoelectric ceramic pairs at corresponding positions of all piezoelectric ceramic sheets are exactly the same, thereby achieving the superposition of vibration effects.

[0060] Example 3-2

[0061] The first ultrasonic transducer module 100 and the second ultrasonic transducer assembly 200 of this example can both adopt the motion modes of embodiments 1-1, 1-2, and 1-3 to be superimposed to achieve a larger longitudinal, bending or torsional vibration. The motion modes of embodiments 1-1, 1-2, and 1-3 can also be respectively adopted in pairs to achieve a composite vibration effect.

[0062] For example, the first ultrasonic transducer module 100 of this example adopts the longitudinal vibration of embodiment 1-1, and the second ultrasonic ring energy module 200 adopts the bending vibration of embodiment 1-2 to realize the bending longitudinal composite vibration of the ultrasonic knife handle. The first ultrasonic transducer module 100 of this example can also adopt the torsional vibration of embodiment 1-3, and the second ultrasonic transducer assembly 200 adopts the longitudinal vibration of embodiment 1-1 to realize the longitudinal torsional composite vibration of the ultrasonic knife handle. The first ultrasonic transducer module 100 and the second ultrasonic transducer assembly 200 can also be configured as torsional vibration and the other as bending vibration to realize bending torsion composite vibration.

[0063] It can be seen from the above embodiments that the utility model divides the piezoelectric ceramic sheet into different piezoelectric ceramic units, and only needs to perform corresponding polarization treatment on different piezoelectric ceramic units. By controlling the motion states of different piezoelectric ceramic units on the piezoelectric ceramic sheet, vibration modes such as pure torsional vibration or bending vibration can be achieved.

[0064] The utility model can drive the horn to vibrate accordingly without any improvement on the horn structure, is compatible with the ultrasonic tool handle in the prior art, and has a wide range of applications.

[0065] In addition, the utility model can realize the combination of multiple vibration modes through modular design. By adjusting the polarization direction of the piezoelectric ceramic unit, the longitudinal-torsional composite vibration can be realized according to the processing requirements. The torsion-to-longitudinal ratio is high and can meet various high-strength and precision processing needs. This example can not only realize longitudinal-torsional composite vibration, but also realize bending-longitudinal composite vibration, bending-torsional composite vibration and other composite vibrations that cannot be achieved by existing ultrasonic tool holders. By controlling its vibration frequency, vibration amplitude and vibration direction, precise ultrasonic vibration processing of various high-end difficult-to-process materials can be realized, which can meet various high-strength and precision processing needs.

[0066] The specific implementation modes described above are preferred implementation modes of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation modes, and all equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. An ultrasonic transducer assembly, characterized in that: It includes a piezoelectric ceramic sheet and an electric field generating structure for providing an electric field for the piezoelectric ceramic sheet. The piezoelectric ceramic sheet includes two or more piezoelectric ceramic units that have been polarized. After the electric field is applied, the piezoelectric ceramic units of the piezoelectric ceramic sheet work together to achieve bending or torsional movement of the ultrasonic transducer assembly.

2. The ultrasonic transducer assembly according to claim 1, characterized in that: The number of the piezoelectric ceramic sheets is more than one and is stacked. When the number of the piezoelectric ceramic sheets is more than two, each piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic units, and the polarization directions of the piezoelectric ceramic units at corresponding positions of each piezoelectric ceramic sheet are the same.

3. The ultrasonic transducer assembly according to claim 2, characterized in that: There are two piezoelectric ceramic sheets, namely a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet. The first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are arranged opposite to each other, and each is provided with a plurality of piezoelectric ceramic units that have been polarized. The piezoelectric ceramic units of the first piezoelectric ceramic sheet and the piezoelectric ceramic units of the second piezoelectric ceramic sheet are arranged in corresponding positions in pairs, wherein after an electric field is applied, the vibration states of the two piezoelectric ceramic units at corresponding positions are the same.

4. The ultrasonic transducer assembly according to claim 3, characterized in that: The electric field generating structure comprises a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet is arranged between the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet.

5. The ultrasonic transducer assembly according to claim 3, characterized in that: The first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are in the shape of a hollow ring, and both piezoelectric ceramic sheets are formed by enclosing a plurality of piezoelectric ceramic units.

6. The ultrasonic transducer assembly according to any one of claims 1 to 5, characterized in that: The polarization direction of the piezoelectric ceramic unit includes the same direction as the electric field direction, the opposite direction to the electric field direction or the perpendicular direction to the electric field direction, and is tangent to the outer periphery of the piezoelectric ceramic sheet.

7. An ultrasonic knife handle, comprising the ultrasonic transducer assembly according to any one of claims 1 to 6, characterized in that: The ultrasonic knife handle includes a knife handle body and a horn connected to the knife handle body. The ultrasonic transducer assembly is arranged at one end of the horn close to the knife handle body. After an electric field is applied, the ultrasonic transducer assembly bends or twists, so that the ultrasonic knife handle achieves bending or torsional vibration.

8. The ultrasonic knife handle according to claim 7, characterized in that: The handle body is provided with a mounting cavity at the front end close to the amplitude transformer, and the ultrasonic transducer assembly is arranged in the mounting cavity.

9. The ultrasonic knife handle according to claim 7, characterized in that: The ultrasonic shank further comprises a matching block arranged on the horn, and the matching block presses the ultrasonic transducer assembly onto the horn.

10. The ultrasonic knife handle according to claim 9, characterized in that: The ultrasonic shank further comprises a wireless transmission module for supplying power to the ultrasonic transducer assembly. The wireless transmission module is arranged on the shank body, and the positive and negative electrodes are respectively connected to the electric field generating structure through wires.

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