An ultrasonic transducer assembly and an ultrasonic machining apparatus

Abstract

The utility model provides a kind of ultrasonic transducer assembly and ultrasonic processing equipment.The ultrasonic transducer assembly and ultrasonic processing equipment include shell, the inner wall of shell is equipped with transducer and amplitude lever, transducer is connected with amplitude lever by pre-tightening bolt axially, the vibration node area of amplitude lever is equipped with locating ring, locating ring is equipped with elastic damping layer between amplitude lever, locating ring outside is equipped with the radial compression sleeve matched with it, adjustable mounting bracket is connected on locating ring, mounting bracket includes multiple flange plates fixed on the outer periphery of locating ring, multiple flange plates are vertically equipped with connecting column, pre-tightening nut is equipped at the end of connecting column away from flange plate, for suspending transducer assembly and fixing on external mounting plate, the ultrasonic transducer assembly and ultrasonic processing equipment provided by the utility model have the advantages of elastic damping layer vibration reduction and consumption reduction, locating ring is arranged in vibration node to ensure stability;Adjustable suspension bracket realizes accurate centering, improves installation precision and compatibility.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic transducers, and in particular to an ultrasonic transducer assembly and ultrasonic processing equipment. Background Technology

[0002] Ultrasonic transducers are the core actuators in ultrasonic processing equipment, widely used in ultrasonic cleaning, welding, cutting, atomization and precision machining. Their basic principle is to use the inverse piezoelectric effect of piezoelectric ceramics to convert high-frequency electrical energy into mechanical vibration, and then amplify the amplitude through an amplitude transformer to generate high-intensity ultrasonic energy at the tool end, thereby achieving physical or chemical action on the workpiece.

[0003] An ultrasonic transducer disclosed in the utility model authorized by CN218217130U includes a transducer and an amplitude transformer. The transducer is fixedly connected to the amplitude transformer. An installation component is provided on the outer side of the amplitude transformer. The installation component includes a positioning ring sleeved on the outer side of the amplitude transformer. A compression ring is provided on the side of the positioning ring. The inner side of the compression ring contacts the outer side of the amplitude transformer. The spring connecting the positioning ring and the compression ring in the above-mentioned device may generate secondary vibration or resonance under the high-frequency vibration of ultrasonic waves, affecting the overall vibration stability of the oscillator.

[0004] Therefore, it is necessary to provide a new ultrasonic transducer assembly and ultrasonic processing equipment to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an ultrasonic transducer assembly and an ultrasonic processing equipment.

[0006] The ultrasonic transducer assembly provided by this utility model includes a housing. The inner wall of the housing is provided with a transducer and an amplitude transformer. The transducer and the amplitude transformer are axially connected by pre-tightening bolts. A positioning ring is sleeved on the vibration node area of ​​the amplitude transformer. An elastic damping layer is provided between the positioning ring and the amplitude transformer. A radial clamping sleeve that cooperates with the positioning ring is provided on the outer side of the positioning ring. An adjustable mounting bracket is connected to the positioning ring. The mounting bracket includes multiple flanges fixed to the outer periphery of the positioning ring. A connecting column is vertically installed on each of the multiple flanges. A pre-tightening nut is provided at the end of the connecting column away from the flange for suspending and fixing the transducer assembly to an external mounting plate.

[0007] Preferably, the elastic damping layer is an annular silicone pad, which is interference-fitted between the inner wall of the positioning ring and the outer wall of the amplitude transformer.

[0008] Preferably, the transducer includes a piezoelectric ceramic sheet assembly and conductive plates disposed on both sides thereof. A buffer sealing gasket is provided on the outer periphery of the conductive plate. The buffer sealing gasket is an integrally molded rubber sleeve, which is fixed in the circumferential groove of the conductive plate by a molding process. The buffer sealing gasket is covered with a heat-shrinkable insulating sleeve.

[0009] Preferably, the inner wall of the radial clamping sleeve is provided with a conical surface, the outer wall of the positioning ring is provided with a matching inclined surface, and the radial clamping sleeve achieves radial contraction by rotation, thereby applying a uniform locking force to the positioning ring.

[0010] Preferably, a protective cap is fitted onto one end of the luffing rod, and the protective cap is snapped together with the luffing rod. A protective plate is provided at the other end of the luffing rod, and a fastening ring is fixed to the outside of the protective plate for positioning. The bottom of the fastening ring is fixedly connected to the top of the mounting plate, and the bottom of the mounting plate is fixedly connected to the bottom of the inner wall of the outer casing.

[0011] The ultrasonic processing equipment provided by this utility model includes any one of the above-mentioned ultrasonic transducer components.

[0012] Compared with related technologies, the ultrasonic transducer assembly and ultrasonic processing equipment provided by this utility model have the following beneficial effects: An elastic damping layer is provided between the positioning ring and the amplitude transformer, which can effectively absorb and attenuate lateral or non-axial vibrations, preventing vibration energy from being transmitted to the outer shell or external installation structure through the positioning ring. The elastic damping layer plays a flexible fixing role in supporting the vibration node, ensuring structural stability while avoiding stress concentration and energy loss caused by rigid connections, thus improving energy conversion efficiency. The vibration node area of ​​the amplitude transformer is the position of minimum amplitude. Setting the positioning ring here, in conjunction with the elastic damping layer, allows for reliable fixing without interfering with the main vibration mode, ensuring unimpeded free vibration of the amplitude transformer, which is beneficial for maintaining its resonance characteristics and improving output amplitude and stability. The mounting bracket uses a structure of multiple flanges connecting adjustable connecting columns and pre-tightening nuts, allowing the suspension position of the entire transducer assembly to be controlled by adjusting the nut height. This achieves precise centering and leveling of the transducer assembly in space, adapting to the installation requirements of different equipment and improving assembly accuracy and compatibility. Attached Figure Description

[0013] Figure 1 A schematic diagram of a preferred embodiment of the ultrasonic transducer assembly and ultrasonic processing equipment provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the adjustable component. Figure 3 for Figure 1 The diagram shown is a structural schematic of the amplitude transformer. Figure 4 for Figure 1The diagram shows the structure of the vibration node. The following are the labels in the diagram: 1. Outer shell; 2. Amplifier rod; 3. Buffer sealing gasket; 4. Positioning ring; 5. Radial clamping sleeve; 6. Elastic damping layer; 7. Protective plate; 8. Fastening ring; 9. Mounting plate; 10. Preload nut; 11. Connecting column; 12. Flange; 13. Conductive plate; 14. Protective cap; 15. Piezoelectric ceramic sheet. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Please refer to the following: Figure 1 , Figure 2 , Figure 3 as well as Figure 4 ,in, Figure 1 A schematic diagram of a preferred embodiment of the ultrasonic transducer assembly and ultrasonic processing equipment provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the adjustable component. Figure 3 for Figure 1 The diagram shown is a structural schematic of the amplitude transformer. Figure 4 for Figure 1 The diagram shows the structure of the vibration node.

[0016] In the specific implementation process, such as Figure 1-2 As shown, this utility model provides an ultrasonic transducer assembly and ultrasonic processing equipment, including a housing 1. A transducer and an amplitude transformer 2 are provided on the inner wall of the housing 1. The transducer and the amplitude transformer 2 are axially connected by pre-tightening bolts. A positioning ring 4 is fitted over the vibration node area of ​​the amplitude transformer 2. An elastic damping layer 6 is provided between the positioning ring 4 and the amplitude transformer 2. A radial clamping sleeve 5 is provided on the outer side of the positioning ring 4 to cooperate with it. An adjustable mounting bracket is connected to the positioning ring 4. The mounting bracket includes multiple flanges 12 fixed to the outer periphery of the positioning ring 4. Each flange 12 is vertically mounted with a connecting column 11. The end of the connecting column 11 away from the flange 12 is provided with a pre-tightening nut 10, which is used to suspend and fix the vibrator assembly to the external mounting plate 9. One end of the amplitude rod 2 is fitted with a protective cap 14, which is snapped together with the amplitude rod 2. The other end of the amplitude rod 2 is provided with a protective plate 7. A fastening ring 8 is fixed on the outside of the protective plate 7 for positioning. The bottom of the fastening ring 8 is fixedly connected to the top of the mounting plate 9, and the bottom of the mounting plate 9 is fixedly connected to the bottom of the inner wall of the outer shell 1. It should be noted that the outer casing 1 is an overall support structure that protects the internal components; the transducer converts high-frequency electrical signals into mechanical vibrations; the amplitude transformer 2, also known as the "amplifier," is used to amplify the vibration amplitude generated by the transducer and transmit it to the tool end; its vibration has a "nodal region," that is, the position where the vibration displacement is minimal, which is suitable as a support point; the pre-tightening bolts axially lock the transducer and amplitude transformer to ensure efficient transmission of vibration energy and prevent loosening; the positioning ring 4 is fitted at the vibration node of the amplitude transformer 2 as a support structure to avoid affecting the vibration transmission efficiency; the elastic damping layer 6 is set between the positioning ring 4 and the amplitude transformer 2 to absorb lateral vibration, reduce stress concentration, and improve service life; the radial clamping sleeve 5 wraps around the outside of the positioning ring 4 to achieve radial fixation and prevent the positioning ring 4 from loosening or shifting; the flange 12 is fixed to the outer circumference of the positioning ring 4 as a basic connecting component of the mounting bracket, and multiple flanges are distributed to enhance stability; the connecting column 11 is vertically installed on the flange 12 and extends upward to connect to the external mounting structure; the pre-tightening nut 10 is tightened on the top of the connecting column 11, and works with the external mounting plate 9 to achieve suspension fixation. The mounting plate 9 is a fixed platform on the equipment, with the vibrator assembly suspended and fixed below it by connecting columns 11 and preload nuts 10. A protective cap 14 is fitted over one end of the amplitude transformer 2 (usually the front output end) to prevent dust ingress or accidental damage. A snap-fit ​​connection facilitates disassembly and maintenance. A protective plate 7 is installed at the other end of the amplitude transformer 2 (near the transducer side) to prevent dust and loosening. A fastening ring 8 fixes the protective plate 7 in place and welds or screws its bottom to the top of the mounting plate 9, forming a double fixation. The mounting plate 9 supports the fastening ring 8 and the protective structure, while also being fixed to the bottom of the inner wall of the outer casing 1, forming a stable support chain. A positioning ring 4 is located in the vibration node area of ​​the amplitude transformer 2 and is equipped with an elastic damping layer 6, which effectively supports the entire vibrator system without significantly interfering with energy transmission in the main vibration direction, while reducing structural fatigue risk. The structure of connecting columns 11 and preload nuts 10 allows for height adjustment and preload control of the vibrator assembly relative to the external mounting plate 9, adapting to different assembly requirements and improving versatility and reliability.

[0017] In the specific implementation process, refer to Figure 3-4 As shown, this utility model provides an ultrasonic transducer assembly and ultrasonic processing equipment. The elastic damping layer 6 is an annular silicone pad, which is interference-fitted between the inner wall of the positioning ring 4 and the outer wall of the amplitude transformer 2. The transducer includes 15 sets of piezoelectric ceramic sheets and conductive plates 13 disposed on both sides thereon. A buffer sealing gasket 3 is provided on the outer periphery of the conductive plate 13. The buffer sealing gasket 3 is an integrally formed rubber sleeve, which is fixed in the circumferential groove of the conductive plate 13 by molding process. The buffer sealing gasket 3 is covered with a heat-shrinkable insulating sleeve. The inner wall of the radial compression sleeve 5 is provided with a conical surface, and the outer wall of the positioning ring 4 is provided with a matching inclined surface. The radial compression sleeve 5 achieves radial contraction by rotation, applying a uniform locking force to the positioning ring 4. It should be noted that the silicone pad, as an elastic damping element, fills the tiny gap between the inner wall of the positioning ring 4 and the outer wall of the amplitude transformer 2. Through interference fit, it generates pre-pressure to ensure a tight fit and effectively absorb lateral disturbances, fretting wear, and thermal stress deformation during vibration. The piezoelectric ceramic sheet 15, composed of multiple stacked PZT (lead zirconate titanate) ceramic elements, generates an inverse piezoelectric effect after a high-frequency AC voltage is applied, producing axial mechanical vibration. The conductive plate 13, installed on both sides of the piezoelectric ceramic sheet, is used to conduct electrical signals and is typically made of conductive metal (such as brass or aluminum), serving as both an electrode and an end block. The buffer sealing gasket 3, an integrally molded rubber sleeve, is embedded in the circumferential groove of the conductive plate 13, serving a dual function: buffering to reduce the transmission of vibration to the outer shell and prevent structural resonance. Sealing: Prevents dust and moisture from entering the piezoelectric stack, avoiding short circuits or performance degradation; the buffer sealing gasket 3 is fixed by molding, indicating that the buffer sealing gasket 3 and the conductive plate 13 are integrally formed, with a firm bond, and are not easy to fall off after long-term use, which is superior to the adhesive method; the heat-shrinkable insulating sleeve is fitted on the outside of the buffer sealing gasket 3, and shrinks tightly to the surface after heating, providing: high-voltage insulation protection (preventing high-voltage breakdown), moisture-proof, dust-proof secondary sealing, and mechanical protection to prevent external damage to the conductive parts; the silicone gasket has a Shore A hardness of 50°~70°, a thickness of 0.5~2mm, and an interference fit controlled between 0.08~0.15mm to balance damping effect and assembly feasibility; the heat-shrinkable insulating sleeve is made of polyolefin or fluoroplastic, with a shrinkage ratio of not less than 2:1.

[0018] The working principle of this utility model is as follows: Multiple piezoelectric ceramic sheets (15 groups) are alternately stacked with conductive plates (13), and conductive plates (13) are added to both ends to form a sandwich structure. Axial locking is achieved through pre-tightening bolts to form a complete transducer unit. An annular silicone pad (elastic damping layer 6) with a Shore A hardness of 50°~70° is fitted into the inner wall of the positioning ring 4 with an interference fit (interference amount 0.08~0.15mm). This assembly is then fitted into the vibration node area of ​​the amplitude transformer 2, ensuring the silicone pad is tightly fitted to the outer wall of the amplitude transformer 2. A radial clamping sleeve (5) is fitted onto the outside of the positioning ring 4. Rotating the clamping sleeve utilizes the engagement between its inner conical surface and the inclined surface of the outer wall of the positioning ring 4 to achieve radial contraction, thus tightening the positioning ring 4. Apply uniform locking force to prevent loosening; multiple flanges 12 are fixed to the outer periphery of the positioning ring 4, and connecting columns 11 are vertically installed on each flange 12, with pre-tightening nuts 10 installed at the top. The entire vibrator assembly is suspended below the external mounting plate 9 through the connecting columns 11. Tighten the pre-tightening nuts 10 and adjust the height and pre-tightening force to achieve flexible and adjustable installation; a protective cap 14 is snapped to the front end (tool end) of the amplitude rod 2 for dust and impact protection, and a protective plate 7 is installed at the rear end and fixed with a fastening ring 8. The bottom of the fastening ring 8 is welded or screwed to the top of the mounting plate 9, and the mounting plate 9 is fixed to the bottom of the inner wall of the outer shell 1 to form a stable support chain; the buffer sealing gasket 3 is integrally formed on the circumference of the conductive plate 13 through a molding process. The groove is covered with a heat-shrinkable insulating sleeve (made of polyolefin or fluoroplastic, with a shrinkage ratio ≥2:1). After heating, it shrinks and fits tightly, completing high-voltage insulation and secondary sealing. An external high-frequency power supply applies alternating voltage to the piezoelectric ceramic sheet 15 through the conductive plate 13, triggering the inverse piezoelectric effect and generating high-frequency axial mechanical vibration (typically 20kHz~40kHz). The vibration is transmitted to the amplitude transformer 2 via a transducer. The amplitude transformer amplifies the amplitude according to its geometry (such as stepped or exponential). The amplified vibration is transmitted to the front-end tool (such as a welding head or cutting knife) for ultrasonic welding, cleaning, or processing. The positioning ring 4 is located in the "node region" where the vibration displacement of the amplitude transformer 2 is minimal, providing support. The main vibration mode is not significantly affected. The elastic damping layer 6 absorbs lateral vibration and fretting wear, reducing stress concentration. The buffer sealing gasket 3 further isolates the vibration from being transmitted to the outer shell 1, avoiding resonance. The radial clamping sleeve 5 continuously provides uniform locking force to prevent the positioning ring from loosening. The suspended mounting bracket allows for small displacement compensation, improving the dynamic stability of the system. The heat-shrinkable insulating sleeve ensures electrical safety under high-voltage conditions. The snap-fit ​​connection allows the protective cap 14 to be quickly removed by hand, facilitating cleaning or replacement of the front-end tools. Loosening the preload nut 10 allows the entire oscillator assembly to be lifted out of the outer shell 1, facilitating the maintenance of the transducer or amplitude rod. If it is necessary to replace the silicone gasket or the buffer sealing gasket 3, the positioning ring 4 or the conductive plate 13 can be disassembled.

[0019] This ultrasonic transducer assembly and ultrasonic processing equipment have the following advantages: the pre-tightening bolts ensure a tight fit between the piezoelectric ceramic plate 15 and the amplitude transformer 2, avoiding energy reflection and heating caused by gaps; the positioning ring 4 is set in the "node area" where vibration displacement is minimal, so it does not interfere with the main vibration direction during support; the elastic damping layer 6 only absorbs lateral disturbances and does not affect the axial vibration transmission efficiency; the radial clamping sleeve 5 with a conical fit achieves uniform radial contraction through rotation, resulting in uniform locking force distribution and excellent anti-loosening performance; the suspension bracket is fixed by multiple connecting columns 11 and pre-tightening nuts 10, avoiding stress concentration caused by rigid connections. In the middle, the protective plate 7, the fastening ring 8, and the mounting plate 9 form a closed-loop support chain, which improves the overall rigidity and shock resistance. The annular silicone pad has an interference fit, which effectively absorbs fretting wear and lateral vibration. The buffer sealing gasket 3 isolates the rigid contact between the transducer and the outer shell 1, reducing structural sound transmission. The double sealing structure (rubber sleeve and heat shrink tubing) further suppresses vibration leakage. The buffer sealing gasket 3 is integrally formed in the groove of the conductive plate 13, which has good sealing performance, dustproof and waterproof. The heat shrink tubing provides high voltage insulation (up to several kilovolts) to prevent high voltage breakdown. The double protection design meets the IP protection level requirements (such as IP54 and above).

[0020] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0021] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An ultrasonic transducer assembly, comprising a housing (1), wherein a transducer and an amplitude transformer (2) are disposed on the inner wall of the housing (1), the transducer and the amplitude transformer (2) being axially connected by preload bolts, characterized in that, A positioning ring (4) is fitted over the vibration node area of ​​the amplitude rod (2). An elastic damping layer (6) is provided between the positioning ring (4) and the amplitude rod (2). A radial compression sleeve (5) is provided on the outside of the positioning ring (4) to cooperate with it. An adjustable mounting bracket is connected to the positioning ring (4). The mounting bracket includes multiple flanges (12) fixed to the outer periphery of the positioning ring (4). A connecting column (11) is vertically installed on each of the multiple flanges (12). A preload nut (10) is provided at the end of the connecting column (11) away from the flange (12) for suspending and fixing the vibrator assembly on the external mounting plate (9).

2. The ultrasonic transducer assembly according to claim 1, characterized in that, The elastic damping layer (6) is an annular silicone pad, which is interference-fitted between the inner wall of the positioning ring (4) and the outer wall of the amplitude rod (2).

3. The ultrasonic transducer assembly according to claim 2, characterized in that, The transducer includes a piezoelectric ceramic sheet (15) assembly and conductive plates (13) disposed on both sides thereof. A buffer sealing gasket (3) is provided on the outer periphery of the conductive plate (13). The buffer sealing gasket (3) is an integrally formed rubber sleeve, which is fixed in the circumferential groove of the conductive plate (13) by molding process. The buffer sealing gasket (3) is covered with a heat-shrinkable insulating sleeve.

4. The ultrasonic transducer assembly according to claim 3, characterized in that, The radial compression sleeve (5) has a conical surface on its inner wall and a matching inclined surface on its outer wall. The radial compression sleeve (5) achieves radial contraction by rotation, and applies a uniform locking force to the positioning ring (4).

5. The ultrasonic transducer assembly according to claim 4, characterized in that, One end of the amplitude rod (2) is fitted with a protective cap (14), and the protective cap (14) is snapped together with the amplitude rod (2). The other end of the amplitude rod (2) is provided with a protective plate (7), and a fastening ring (8) is fixed on the outside of the protective plate (7) for positioning. The bottom of the fastening ring (8) is fixedly connected to the top of the mounting plate (9), and the bottom of the mounting plate (9) is fixedly connected to the bottom of the inner wall of the outer shell (1).

6. An ultrasonic processing apparatus, comprising the ultrasonic transducer assembly as described in any one of claims 1 to 5.

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