High-power ultrasonic transducer

Abstract

The high-power ultrasonic transducer comprises an ultrasonic vibrator and an amplitude-change pole which are fixedly connected, and the ultrasonic transducer is formed by stacking a front end column, a plurality of piezoelectric ceramic pieces and a rear end column front and back; the piezoelectric ceramic piece is evenly cut into a plurality of fan-shaped areas, polymers are poured into grooves between the fan-shaped areas and the radial periphery of the piezoelectric ceramic piece, and copper deposition electrode plates are attached to the front face and the back face of the piezoelectric ceramic piece. The piezoelectric ceramic piece is of a composite structure, the piezoelectric ceramic piece is divided into small blocks which are connected through polymers, the surfaces of the small blocks are covered with copper deposition electrode plates, the small blocks generate same-frequency vibration, vibration cracking caused by too large area is avoided, and therefore the upper limit of power is improved. In addition, the copper deposition electrode plate replaces a bonding pad by pressing and connecting a conducting strip in the locking screw rod and an edge folding contact disc of the piezoelectric ceramic piece, so that the welding flux is prevented from being heated and melted under high-frequency vibration.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic processing equipment, in particular to a high-power ultrasonic transducer. Background Art

[0002] Ultrasonic technology is a comprehensive high-tech discipline based on classical acoustic theory, incorporating advances from electronics, materials science, signal processing, radar, solid-state physics, fluid physics, biotechnology, and computing. Ultrasonic transducers are energy converters that convert alternating electrical signals into acoustic signals, or vice versa, within the ultrasonic frequency range. They are key components in ultrasonic equipment, generating ultrasonic vibrations for industrial processes such as welding and cutting. Ultrasonic transducers used in industrial processes often use piezoelectric ceramic sheets as the vibration source. These sheets are cut into circular shapes and stacked together. In specialized applications, such as ultrasonic wire drawing or metal welding, extremely high-power ultrasonic waves are required. However, existing piezoelectric ceramic sheets have limited tensile strength. Excessively large piezoelectric ceramic sheets can easily break under prolonged vibration, limiting the transducer's power capacity. Utility Model Content

[0003] In view of the defects of the background technology, the present invention proposes a high-power ultrasonic transducer, which can improve the ultrasonic power of the ultrasonic transducer and complete industrial processing in special occasions.

[0004] The utility model proposes a high-power ultrasonic transducer, comprising an ultrasonic vibrator and an horn fixedly connected, wherein the ultrasonic transducer is composed of a front-end column, a plurality of piezoelectric ceramic sheets and a rear-end column stacked in a front-to-back manner;

[0005] The piezoelectric ceramic sheet is evenly cut into multiple sector-shaped areas, the grooves between the sector-shaped areas and the radial periphery of the piezoelectric ceramic sheet are filled with polymer, and copper-plated electrode plates are attached to the front and back of the piezoelectric ceramic sheet.

[0006] Preferably, the front end column, the piezoelectric ceramic sheet and the rear end column are provided with axial holes in the middle thereof, and are compressed and fixed by locking screws passing through the axial holes;

[0007] A folded contact disc is provided on the inner side of the copper-plated electrode plate near the shaft hole, and a conductive sheet is provided on the locking screw. One end of the conductive sheet is electrically connected to the folded contact disc, and the other end extends along the locking screw and passes through the head of the locking screw to be connected to the external wire.

[0008] Preferably, the locking screw is provided with a pair of axial through holes, and a conductive sheet is passed through each axial through hole;

[0009] The conductive sheet is wrapped in insulating glue, and the head portion contacting the folded edge contact disc is provided with a contact sheet exposed from the insulating glue.

[0010] Preferably, the locking screw is provided with an annular groove, the contact piece is wrapped in the annular groove in an arc shape, and an elastic rubber pad is provided on the inner side of the contact piece.

[0011] Preferably, the tail end of the conductive sheet is provided with a connecting portion;

[0012] The connecting part has a plug, and the cable terminated with the connecting part is provided with a flat slot that matches the shape of the plug.

[0013] Preferably, the horn includes a vibrator mounting plate and a stepped rod body, the vibrator mounting plate is arranged on the top of the stepped rod body, and a plurality of ultrasonic vibrators are evenly mounted on the radial circumference of the vibrator mounting plate.

[0014] Preferably, a pressure column is provided on the top of the vibrator mounting plate.

[0015] Preferably, a flange is provided on the stepped rod body.

[0016] The beneficial effects of the present invention include: the piezoelectric ceramic sheet adopts a composite structure, the piezoelectric ceramic sheet is divided into small pieces connected by a polymer, and the surface is covered with a copper-plated electrode plate, so that each small piece produces vibrations at the same frequency and will not cause vibration cracking due to excessive area, thereby increasing the power upper limit; the copper-plated electrode plate replaces the soldering pad by pressing and connecting the conductive sheet in the locking screw with the folded edge contact plate of the piezoelectric ceramic sheet, thereby avoiding heat and melting of the solder under high-frequency vibration; the amplitude rod with a mounting plate can be installed with multiple ultrasonic vibrators. Due to the mutual coupling in the radius and height directions, the radial vibration energy can be converted into axial energy, thereby achieving high-power output of axial energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0018] Figure 1 It is a stereoscopic diagram of the high-power ultrasonic transducer of the utility model.

[0019] Figure 2 It is a three-dimensional diagram of the ultrasonic vibrator of the utility model.

[0020] Figure 3 It is a structural explosion diagram of the ultrasonic vibrator of the utility model.

[0021] Figure 4 It is a cross-sectional view of the ultrasonic vibrator of the utility model.

[0022] Figure 5 It is a structural schematic diagram of the piezoelectric ceramic piece of the utility model.

[0023] Figure 6 It is a structural schematic diagram of the conductive sheet of the utility model.

[0024] Reference numerals:

[0025] 100-ultrasonic vibrator, 200-amplitude transformer, 1-front end column, 2-piezoelectric ceramic sheet, 21-sector area, 22-groove, 3-rear end column, 4-copper plate, 41-folded contact plate, 5-locking screw, 51-annular groove, 6-conductive sheet, 61-contact sheet, 62-elastic rubber pad, 63-plug, 7-flat slot, 8-vibrator mounting plate, 81-pressure column, 9-stepped rod body, 91-flange. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, 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 only used to explain the present invention and are not intended to limit the present invention.

[0027] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0028] The principle of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] The utility model proposes a Figure 1-6 The high-power ultrasonic transducer shown includes a fixedly connected ultrasonic vibrator 100 and a horn 200. The ultrasonic transducer is composed of a front column 1, multiple piezoelectric ceramic sheets 2, and a rear column 3 stacked in front and back; the piezoelectric ceramic sheets 2 are evenly divided into multiple sector-shaped areas 21, and the grooves 22 between the sector-shaped areas 21 and the radial periphery of the piezoelectric ceramic sheets 2 are filled with polymer. Copper-plated electrode plates 4 are attached to the front and back of the piezoelectric ceramic sheets 2.

[0030] The piezoelectric ceramic sheet 2 adopts a composite structure. The radial grooves 22 filled with polymer divide the piezoelectric ceramic sheet 2 into small fan-shaped areas 21 connected by polymer. The surface is covered with a copper-plated electrode plate 4, so that each small piece produces vibrations at the same frequency and will not cause vibration cracking due to excessive area, thereby increasing the power limit. It is also possible to continue to increase the area of ​​the piezoelectric ceramic sheet 2 and further increase the grooves 22 extending in the circumferential direction to produce a piezoelectric ceramic sheet 2 with a larger area. In addition, the polymer located on the periphery of the piezoelectric ceramic sheet 2 plays a role in protecting the piezoelectric ceramic sheet 2 and the copper-plated electrode plate 4, avoiding the piezoelectric ceramic sheet 2 from collision and shattering and preventing the copper-plated electrode plate 4 from oxidation. The filled polymer can be a material such as epoxy resin, polyurethane, silicone rubber, etc. The copper-plated electrode plate 4 uses a copper-plated process to form a uniform copper layer on the surface of the piezoelectric ceramic sheet 2. The copper will penetrate into the gaps in the crystals on the surface of the piezoelectric ceramic sheet 2, and the two are closely combined to reduce vibration loss.

[0031] In this embodiment, an axial hole is provided in the middle of the front column 1, the piezoelectric ceramic sheet 2, and the rear column 3, and is clamped and fixed by a locking screw 5 passed through the axial hole; a folded contact disc 41 is provided on the inner side of the copper-plated electrode plate 4 near the axial hole, and the locking screw 5 is provided with a conductive sheet 6, one end of the conductive sheet 6 is electrically connected to the folded contact disc 41, and the other end extends along the locking screw 5 and passes through the head of the locking screw 5 to be connected to an external cable. In a conventional ultrasonic vibrator 100, a soldering pad is usually provided on the outer edge of the piezoelectric ceramic sheet 2, and then the soldering pad is connected to an external wire using solder to provide working current for the electrode plate. However, the soldering point is too close to the piezoelectric ceramic sheet 2, and the high temperature generated by vibration and friction may melt the solder. This embodiment does not connect the wires by welding, which avoids the solder from heating and melting under high-frequency vibration.

[0032] In this embodiment, the locking screw 5 is provided with a pair of axial through-holes, each of which is provided with a conductive sheet 6, each connected to the copper-plated electrode plate 4 of the same polarity. The main body of the locking screw 5 is made of metal. To ensure insulation performance, the conductive sheet 6 is wrapped in insulating adhesive. The head portion that contacts the folded contact disc 41 is provided with a contact 61 exposed from the insulating adhesive. The locking screw 5 is provided with an annular groove 51, and the contact 61 is arc-shaped and enclosed within the annular groove 51. The inner side of the contact 61 is provided with an elastic rubber pad 62. The elastic rubber pad 62 does not affect the installation of the locking screw 5. The elastic rubber pad 62 presses the contact 61 and the folded contact disc 41 to ensure circuit connectivity. The tail end of the conductive sheet 6 is provided with a connecting portion, which has a plug 63. The cable terminated with the connecting portion is provided with a flat slot 7 that matches the shape of the plug 63. The flat slot 7 allows the conductive sheet 6 to be quickly connected to an external cable. This non-welding method also avoids solder melting caused by vibration and friction.

[0033] In this embodiment, the horn 200 includes a vibrator mounting plate 8 and a stepped rod body 9. The vibrator mounting plate 8 is located at the top of the stepped rod body 9. A plurality of ultrasonic vibrators 100 are evenly mounted on the radial circumference of the vibrator mounting plate 8. Due to the mutual coupling between the radial and height directions, the horn 200 can convert radial vibration energy into axial energy, thereby achieving high-power output of axial energy.

[0034] In this embodiment, a pressure column 81 is provided on the top of the vibrator mounting plate 8, and the top of the pressure column 81 is connected to the hydraulic equipment. The bottom end of the amplitude rod 200 contacts the workpiece through the vibration head. Under the action of pressure, the surface of the workpiece is vibrated and rubbed through ultrasonic vibration to achieve welding or cutting effects.

[0035] A flange 91 is provided on the stepped rod body 9 and is used for mounting and fixing a high-power ultrasonic transducer.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-power ultrasonic transducer, comprising an ultrasonic vibrator and a horn fixedly connected, characterized in that: The ultrasonic transducer is composed of a front-end column, a plurality of piezoelectric ceramic sheets and a rear-end column stacked in front and back; The piezoelectric ceramic sheet is evenly divided into a plurality of sector-shaped areas. The grooves between the sector-shaped areas and the radial periphery of the piezoelectric ceramic sheet are filled with polymer. Copper-plated electrode plates are attached to the front and back of the piezoelectric ceramic sheet.

2. The high-power ultrasonic transducer according to claim 1, characterized in that: Axial holes are opened in the middle of the front column, the piezoelectric ceramic sheet and the rear column, and are compressed and fixed by locking screws passing through the axis holes; A folded contact disc is provided on the inner side of the copper-plated electrode plate near the shaft hole, and a conductive sheet is provided on the locking screw. One end of the conductive sheet is electrically connected to the folded contact disc, and the other end extends along the locking screw and passes through the head of the locking screw to be connected to an external wire.

3. The high-power ultrasonic transducer according to claim 2, characterized in that: The locking screw is provided with a pair of axial through holes, and a conductive sheet is passed through each axial through hole; The conductive sheet is wrapped in insulating glue, and the head portion in contact with the folded edge contact disc is provided with a contact sheet exposed from the insulating glue.

4. The high-power ultrasonic transducer according to claim 3, characterized in that: The locking screw is provided with an annular groove, the contact piece is wrapped in the annular groove in an arc shape, and an elastic rubber pad is provided on the inner side of the contact piece.

5. The high-power ultrasonic transducer according to claim 4, characterized in that: The tail end of the conductive sheet is provided with a connecting portion; The connecting portion is provided with a plug, and the cable terminated with the connecting portion is provided with a flat slot which matches the shape of the plug.

6. The high-power ultrasonic transducer according to claim 1, characterized in that: The horn comprises a vibrator mounting plate and a stepped rod body. The vibrator mounting plate is arranged on the top of the stepped rod body. A plurality of ultrasonic vibrators are evenly mounted on the radial circumference of the vibrator mounting plate.

7. The high-power ultrasonic transducer according to claim 6, characterized in that: A pressure column is provided on the top of the vibrator mounting plate.

8. The high-power ultrasonic transducer according to claim 6, characterized in that: A flange is provided on the stepped rod body.

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