A large torsional amplitude ultrasonic transducer

Abstract

The present application provides a large torsional amplitude ultrasonic transducer, comprising: a first end cap; a piezoelectric ceramic stack, arranged on one side of the first end cap; the piezoelectric ceramic stack comprises a plurality of piezoelectric ceramic sheets and a plurality of electrode sheets stacked in an interlaced manner; a flange, arranged on one side of the piezoelectric ceramic stack; a second end cap, arranged on one side of the flange; a spiral groove amplitude rod connected to one end of the second end cap; the spiral groove amplitude rod is conical in shape, and an annular groove is provided on the end face of the spiral groove amplitude rod near the second end cap, the annular groove and the spiral groove amplitude rod are coaxially arranged; a plurality of spiral grooves are provided on the surface of the spiral groove amplitude rod; an impact head, connected to one end of the spiral groove amplitude rod; the flange and the second end cap are an integrally formed structure. The present application provides an annular groove on the end face of the spiral groove amplitude rod, and provides a central through hole and a side through hole therein, thereby increasing its amplification factor, improving the longitudinal amplitude of the transducer, accelerating the heat dissipation of the transducer, and ensuring good working performance of the transducer.

Description

Technical Field

[0001] The present application belongs to the technical field of ultrasonic transducers, and more specifically, relates to a large torsional amplitude ultrasonic transducer. Background Art

[0002] Deep space exploration is a key scientific area of ​​global aerospace activity. Obtaining geological samples from extraterrestrial bodies is crucial for understanding their mineral composition, evolutionary processes, and detecting signs of life. Drilling sampling is a key method for obtaining rock samples from celestial surfaces. Ultrasonic transducer drill tools offer advantages such as low drilling pressure, simple structure, low power consumption, wide temperature resistance, and the absence of lubrication. These tools are more suitable for extraterrestrial drilling in harsh environments than conventional electromagnetic motor-driven drills. Currently, the development of ultrasonic composite vibration transducers continues to advance, but they suffer from a disadvantage of relatively low torsional amplitude. Summary of the Invention

[0003] The purpose of the present application is to provide an ultrasonic transducer with a large torsional amplitude to solve the technical problem of low torsional amplitude of ultrasonic composite vibration transducers in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is to provide a large torsional amplitude ultrasonic transducer, comprising:

[0005] a first end cap;

[0006] A piezoelectric ceramic stack is provided on one side of the first end cover; the piezoelectric ceramic stack comprises a plurality of piezoelectric ceramic sheets and a plurality of electrode sheets that are staggered and stacked;

[0007] A flange is provided on one side of the piezoelectric ceramic stack;

[0008] a second end cover, provided on one side of the flange;

[0009] A spiral groove horn is connected to one end of the second end cover; the spiral groove horn is conical in shape, and an annular groove is provided on the end surface of the spiral groove horn close to the second end cover, and the annular groove is coaxially arranged with the spiral groove horn; a plurality of spiral grooves are opened on the surface of the spiral groove horn;

[0010] an impact head connected to one end of the spiral groove horn; and

[0011] A connecting bolt, wherein the connecting bolt passes through the first end cover, the piezoelectric ceramic stack, the flange and the second end cover in sequence and connects the first end cover, the piezoelectric ceramic stack, the flange and the second end cover into one body; the flange and the second end cover are an integrally formed structure.

[0012] Furthermore, the impact head includes a first part and a second part connected in a T-shape, and the first part is connected to one end of the spiral groove amplitude rod.

[0013] Furthermore, the second part is threadedly connected to the first part.

[0014] Furthermore, an annular groove is provided on an end surface of the flange away from the piezoelectric ceramic stack, and the annular groove is coaxially arranged with the spiral groove amplitude rod.

[0015] Furthermore, a plurality of threaded holes are symmetrically provided on the flange.

[0016] Furthermore, a central through hole and a side through hole connected to the central through hole are provided in the spiral groove amplitude transformer, one end of the side through hole is connected to the central through hole, and the other end is provided on the outer surface of the spiral groove amplitude transformer.

[0017] Furthermore, the side through hole is arranged perpendicular to the central through hole; and / or,

[0018] There are multiple side through holes.

[0019] Furthermore, the plurality of spiral grooves are in a concentric sector-shaped spiral structure, the concentric sector angle is 30°≤θ≤60°, and the depth is 2mm≤h≤6mm.

[0020] Furthermore, the second end cover and the spiral groove amplitude rod are connected via a screw.

[0021] Furthermore, the spiral groove amplitude transformer and the impact head are an integrally formed structure.

[0022] Compared with the existing technology, this application has the following technical effects:

[0023] A large torsional amplitude ultrasonic transducer of the present application converts the high-frequency simple harmonic vibration of the piezoelectric ceramic stack into elliptical motion by arranging multiple spiral grooves on the surface of the spiral groove amplitude transformer, and achieves the large longitudinal amplitude and large torsional amplitude required by the ultrasonic transducer by changing the angle, depth and spiral angle of the spiral groove structure. It is applied to an ultrasonic driller, so that the ultrasonic driller has higher drilling efficiency and chip removal performance; the present application adopts a conical spiral groove amplitude transformer, and its structural dimensions meet the frequency equation and resonance design method, while further increasing the amplification factor of the spiral groove amplitude transformer, improving the longitudinal-longitudinal torsional amplitude of the ultrasonic transducer, and improving its drilling efficiency; the present application arranges an annular groove on the end face of the spiral groove amplitude transformer, and its structural dimensions meet the frequency equation and resonance design method, while further increasing the amplification factor of the spiral groove amplitude transformer, improving the longitudinal amplitude of the ultrasonic transducer, and improving its drilling efficiency.

[0024] The transducer of the present application accelerates heat dissipation of the transducer and the drilling tool connected to the transducer by arranging a central through hole and a side through hole inside the spiral groove amplitude transformer, thereby ensuring good working performance of the transducer.

[0025] The transducer of the present application realizes the rotation and impact motion of the ultrasonic transducer drill simultaneously through the piezoelectric ceramic stack, which can reduce the load mass of the drill and the complexity of the device, while having high mechanical strength and large torsional output amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic diagram of the overall structure of a large torsional amplitude ultrasonic transducer provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 Exploded diagram;

[0029] Figure 3 for Figure 1 sectional view of

[0030] Figure 4 for Figure 1 Cross-section of the mid-helical groove horn;

[0031] Figure 5 for Figure 4 Top view of the middle AA cross section;

[0032] Figure 6 for Figure 4 Top view of the cross section of the middle BB.

[0033] Among them, the reference numerals in the figures are:

[0034] 1. First end cover, 2. Piezoelectric ceramic stack, 3. Flange, 4. Second end cover, 5. Spiral groove amplitude transformer, 6. Impact head, 7. Connecting bolt, 8. Screw, 201. Piezoelectric ceramic sheet, 202. Electrode sheet, 301. Annular groove, 302. Threaded hole, 501. Annular groove, 502. Spiral groove, 503. Center through hole, 504. Side through hole, 601. First part, 602. Second part. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application 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 only used to explain this application and are not intended to limit this application.

[0036] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the terms "length", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0038] In addition, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," and "fifth" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise explicitly and specifically defined.

[0039] Please also refer to Figures 1 to 6 , a large torsional amplitude ultrasonic transducer provided in an embodiment of the present application is now described.

[0040] In one embodiment of the present application, a large torsional amplitude ultrasonic transducer of the embodiment of the present application includes a first end cover 1, a piezoelectric ceramic stack 2, a flange 3, a second end cover 4, a spiral groove amplitude rod 5, an impact head 6 and a connecting bolt 7. The piezoelectric ceramic stack 2 is arranged on one side of the first end cover 1; the piezoelectric ceramic stack 2 includes a plurality of piezoelectric ceramic sheets 201 and a plurality of electrode sheets 202 that are staggered and stacked; the flange 3 is arranged on one side of the piezoelectric ceramic stack 2; the second end cover 4 is arranged on one side of the flange 3; the spiral groove amplitude rod 5 is connected to one end of the second end cover 4; the spiral groove amplitude rod 5 is conical, and an annular groove 501 is provided on the end surface of the spiral groove amplitude rod 5 close to the second end cover 4, and the annular groove 501 is coaxially arranged with the spiral groove amplitude rod 5; a plurality of spiral grooves 502 are opened on the surface of the spiral groove amplitude rod 5; the impact head 6 is connected to one end of the spiral groove amplitude rod 5; the connecting bolt 7 passes through the first end cover 1, the piezoelectric ceramic stack 2, the flange 3 and the second end cover 4 in sequence and connects the first end cover 1, the piezoelectric ceramic stack 2, the flange 3 and the second end cover 4 into one; the flange 3 and the second end cover 4 are an integrally formed structure.

[0041] In the embodiment of the present application, the flange 3 and the second end cover 4 are an integrally formed structure, which means that the flange 3 and the second end cover 4 can be integrally formed and designed into one component. The integral forming can improve the overall stability of the structure.

[0042] See also Figure 2 The piezoelectric ceramic stack 2 of the embodiment of the present application is located between the first end cover 1 and the flange 3, and includes four annular piezoelectric ceramic sheets 201 and five electrode sheets 202 arranged axially and in a transversely staggered manner.

[0043] See also Figure 2 、 Figure 3 In the embodiment of the present application, threaded connection holes are provided in the centers of the first end cover 1, the piezoelectric ceramic stack 2, the flange 3 and the second end cover 4, and the connecting bolts 7 pass through the threaded connection holes of the first end cover 1, the piezoelectric ceramic stack 2, the flange 3 and the second end cover 4 from top to bottom and connect them into one.

[0044] The spiral groove amplitude rod 5 and the impact head 6 in the embodiment of the present application can be an integrally formed structure, and the integral forming can improve the stability of the entire structure.

[0045] The second end cover 4 and the spiral groove amplitude transformer 5 in the embodiment of the present application are connected by a screw 8 .

[0046] The spiral groove horn 5 of the present embodiment is generally conical in shape. While its structural dimensions satisfy the frequency equation and resonant design method, it also further increases the amplification factor of the spiral groove horn 5, improving the longitudinal-to-lateral torsional amplitude of the ultrasonic transducer and enhancing its drilling efficiency. Under the excitation of a high-frequency voltage, the piezoelectric ceramic stack 2 generates high-frequency axial vibrations from the second end cap 4. The conical spiral groove horn 5 and the impact head 6 amplify the axial amplitude while converting the axial simple harmonic vibration into an elliptical motion trajectory through the spiral groove 502 structure. The torsional amplitude can be adjusted by varying parameters such as the sector angle θ, depth h, and spiral angle of the spiral grooves 502 on its surface, achieving the large longitudinal and torsional amplitudes required by the ultrasonic transducer. Application of this invention to ultrasonic drills can improve drilling efficiency and chip removal performance.

[0047] The ultrasonic transducer of this embodiment is provided with an annular groove 501 on the end surface of the spiral groove horn 5. While its structural dimensions satisfy the frequency equation and resonance design method, it further increases the amplification factor of the spiral groove horn 5, thereby increasing the longitudinal-to-lateral torsional amplitude of the ultrasonic transducer and improving its drilling efficiency. The cutting height and width of the annular groove 501 can be adjusted to achieve the optimal output of the transducer's torsional amplitude, thereby improving the chip removal efficiency of the ultrasonic drill.

[0048] The cutting height of the shaped groove 501 in the embodiment of the present application is: 20mm≤h≤50mm; the inner radius of the annular groove 501 is: 8mm≤r≤10mm; and the cutting width of the shaped groove 501 is: 1mm≤c≤2mm.

[0049] The ultrasonic transducer of the embodiment of the present application realizes the rotation and impact motion of the ultrasonic transducer drill simultaneously through the piezoelectric ceramic stack 2, which can reduce the load mass of the drill and the complexity of the device, while having higher mechanical strength and larger torsional output amplitude.

[0050] See also Figure 3 、 Figure 4 Furthermore, the impact head 6 of the embodiment of the present application includes a first portion 601 and a second portion 602 connected in a T-shape, wherein the first portion 601 is connected to one end of the spiral groove amplitude transformer 5. In this case, the first portion 601 and the spiral groove amplitude transformer 5 can be an integrally formed structure. Designing the impact head 6 into a stepped structure with a decreasing cross-section from top to bottom can further increase the amplification factor, improve the longitudinal amplitude of the ultrasonic transducer, and improve its drilling efficiency. Furthermore, the second portion 602 of the embodiment of the present application is threadedly connected to the first portion 601. The threaded connection facilitates adjustment of the extended length of the second portion 602, that is, adjustment of the length of the impact head 6, and thus adjustment of the resonant frequency of the ultrasonic transducer, so that it operates in the optimal longitudinal-torsional mode.

[0051] Furthermore, the flange 3 of this embodiment of the present application has an annular groove 301 on its end surface facing away from the piezoelectric ceramic stack 2. This groove 301 is coaxial with the spirally grooved horn 5. Providing the annular groove 301 on the end surface of the flange 3 reduces the thickness of the flange 3's nodes, better ensuring zero amplitude at the flange 3 and ensuring easier installation. Furthermore, the flange 3 is symmetrically provided with multiple threaded holes 302 for positioning and mounting the ultrasonic transducer.

[0052] Furthermore, the spirally grooved horn 5 of the present embodiment is provided with a central through-hole 503 and a side through-hole 504 connected to the central through-hole 503. One end of the side through-hole 504 is connected to the central through-hole 503, and the other end is located on the outer surface of the spirally grooved horn 5. The provision of the central through-hole 503 and the side through-hole 504 can accelerate heat dissipation from the spirally grooved horn 5, thereby preventing high temperatures from being transferred to the transducer, thereby improving the transducer's performance. Furthermore, the drill tool connected to the impact head 6 generates a large amount of heat during the cutting process. By providing the central through-hole 503 and the side through-holes 504 in the spirally grooved horn 5, heat transfer from the drill tool to the spirally grooved horn 5 can be reduced, while also accelerating heat dissipation from the drill tool. Furthermore, the side through-hole 504 is arranged perpendicular to the central through-hole 503, and multiple side through-holes 504 are provided to accelerate heat dissipation. By adjusting the diameter of the central through-hole 503, the transducer's torsional amplitude can be optimized, thereby improving the chip removal efficiency of the ultrasonic drill.

[0053] The number of the side through holes 504 in the embodiment of the present application is: 2≤n≤6; the diameter of the side through holes 504 is: 2mm≤w≤4mm; the diameter of the central through hole 503 is: 2mm≤w2≤6mm.

[0054] See also Figure 5 、 Figure 6 Furthermore, the spiral groove 502 of the embodiment of the present application has a concentric sector spiral structure, and the concentric sector angle is: 30°≤θ≤60°; depth: 2mm≤h≤6mm.

[0055] Due to the machining requirements of a five-axis CNC machine tool, the concentric sector spiral grooves 502 are chamfered. This has a minimal impact on the transducer's resonant frequency and vibration mode, which can be compensated for by adjusting the length of the impact head 6. Finite element software is used to analyze the effect of directional preload torque on transducer performance, and a force wrench is used to apply preload force to the connecting bolts 7.

[0056] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A large torsional amplitude ultrasonic transducer, characterized in that: include: a first end cap; A piezoelectric ceramic stack is provided on one side of the first end cover; the piezoelectric ceramic stack comprises a plurality of piezoelectric ceramic sheets and a plurality of electrode sheets that are staggered and stacked; A flange is provided on one side of the piezoelectric ceramic stack; a second end cover, provided on one side of the flange; A spiral groove horn is connected to one end of the second end cover; the spiral groove horn is conical in shape, and an annular groove is provided on the end surface of the spiral groove horn close to the second end cover, and the annular groove is coaxially arranged with the spiral groove horn; a plurality of spiral grooves are opened on the surface of the spiral groove horn; an impact head connected to one end of the spiral groove horn; and a connecting bolt, the connecting bolt sequentially passing through the first end cover, the piezoelectric ceramic stack, the flange, and the second end cover to integrally connect the first end cover, the piezoelectric ceramic stack, the flange, and the second end cover; the flange and the second end cover are an integrally formed structure; The impact head includes a first part and a second part connected in a T-shape, wherein the first part is connected to one end of the spiral groove amplitude rod; The second portion is threadedly connected to the first portion.

2. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: An annular groove is provided on an end surface of the flange away from the piezoelectric ceramic stack, and the annular groove is coaxially arranged with the spiral groove amplitude rod.

3. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: A plurality of threaded holes are symmetrically provided on the flange.

4. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: A central through hole and a side through hole connected to the central through hole are provided in the spiral groove amplitude transformer. One end of the side through hole is connected to the central through hole, and the other end is provided on the outer surface of the spiral groove amplitude transformer.

5. The large torsional amplitude ultrasonic transducer according to claim 4, characterized in that: The side through holes are arranged perpendicular to the central through hole; and / or, There are multiple side through holes.

6. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: The plurality of spiral grooves are in a concentric sector-shaped spiral structure, with a concentric sector angle of 30°≤θ≤60° and a depth of 2mm≤h≤6mm.

7. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: The second end cover and the spiral groove amplitude rod are connected via a screw.

8. The large torsional amplitude ultrasonic transducer according to claim 1, characterized in that: The spiral groove amplitude rod and the impact head are an integrally formed structure.

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