WO2024079284A1 - Transducteur à ultrasons, dispositif doté d'un transducteur à ultrasons et utilisation d'un transducteur à ultrasons, et procédé correspondant - Google Patents

Transducteur à ultrasons, dispositif doté d'un transducteur à ultrasons et utilisation d'un transducteur à ultrasons, et procédé correspondant Download PDF

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Publication number
WO2024079284A1
WO2024079284A1 PCT/EP2023/078404 EP2023078404W WO2024079284A1 WO 2024079284 A1 WO2024079284 A1 WO 2024079284A1 EP 2023078404 W EP2023078404 W EP 2023078404W WO 2024079284 A1 WO2024079284 A1 WO 2024079284A1
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WIPO (PCT)
Prior art keywords
ultrasonic
ultrasonic oscillator
width
cuboid
tool
Prior art date
Application number
PCT/EP2023/078404
Other languages
German (de)
English (en)
Inventor
Josef Gmeiner
Original Assignee
Josef Gmeiner
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102022126738.5 external-priority patent/DE102022126738A9/de
Application filed by Josef Gmeiner filed Critical Josef Gmeiner
Publication of WO2024079284A1 publication Critical patent/WO2024079284A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B3/02—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving a change of amplitude
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0648—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of rectangular shape
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated

Definitions

  • the present invention relates to an ultrasonic vibrator for generating high-frequency vibrations, wherein the ultrasonic vibrator is formed in one piece and in the shape of a plate with a thickness in the thickness direction, a length in the length direction and a width in the width direction.
  • the invention also relates to a device with such an ultrasonic vibrator and its use and corresponding methods.
  • plate-shaped ultrasonic vibrators have primarily been known for use in cleaning devices.
  • a plate-shaped ultrasonic vibrator is immersed vertically in a cleaning bath, with a large number of ultrasonic converters attached to its flat back, facing away from the cleaning bath. These set the ultrasonic vibrator into non-harmonic vibrations, which are transferred to the water.
  • the permanently generated overpressure and underpressure in the water creates very small air bubbles that swell to many times their original diameter until they burst and release energy that, for example, removes dirt from surfaces.
  • the well-known plate-shaped ultrasonic cleaning oscillators which mainly work with surface waves, are all tuned to a quarter of their harmonic wavelength ⁇ /4 in order to optimize the coupling to the cleaning medium, usually water or predominantly water.
  • the dimensions of well-known ultrasonic oscillators are chosen so that their length and width are significantly larger than their thickness. However, due to their design, the well-known ultrasonic oscillators can only be used to a very limited extent. 2 UMG-10429a-22 October 12, 2023
  • the object of the present invention is to provide a plate-shaped ultrasonic oscillator with which new fields of application can be opened up. Corresponding devices with such an ultrasonic oscillator, uses and methods are also sought.
  • the object is solved by an ultrasonic oscillator with the features of the independent patent claims. The features of the other independent claims also solve the problem posed.
  • the thickness of the ultrasonic oscillator is m * ⁇ /2, with m as a natural odd number, and the length of which is n * ⁇ /2, with n as a natural number ⁇ 2.
  • the ultrasonic oscillator according to the invention oscillates in the form of a thickness oscillation or several thickness oscillations following one another in the length direction of the ultrasonic oscillator, the thickness oscillations measured in the length direction of the ultrasonic oscillator having the wavelength ⁇ .
  • the ultrasonic oscillator according to the invention is characterized in that the oscillation amplitudes in the width direction are essentially constant over its length.
  • the present invention thus proposes for the first time to tune a plate-shaped ultrasonic oscillator in at least its thickness and length to a wavelength at which it oscillates sinusoidally in the form of thickness oscillations, with one or more thickness oscillations (then following one another in the length direction) occurring.
  • a plate-shaped ultrasonic oscillator in at least its thickness and length to a wavelength at which it oscillates sinusoidally in the form of thickness oscillations, with one or more thickness oscillations (then following one another in the length direction) occurring.
  • the term "one-piece” is understood here to mean a coherent unit that is not created by bonding two or more parts together, but is manufactured as a single piece, in particular by milling from a single block of a suitable metal.
  • the ultrasonic oscillator according to the invention advantageously has a uniform thickness of ⁇ /2. In this case, no knots are formed across the thickness of the ultrasonic oscillator, which is preferred for many applications.
  • the ultrasonic oscillator according to the invention particularly preferably has a width of n * ⁇ /4, where n is a natural number. It has been found that with such a choice, the thickness oscillations and the constant oscillation amplitudes in width directions can be optimized.
  • the width of the ultrasonic oscillator is n* ⁇ /2, where n is a natural number and preferably a 4 UMG-10429a-22 October 12, 2023 is a natural odd number.
  • the width of the ultrasonic oscillator is advantageously 1/2* ⁇ or ⁇ or 3/2 * ⁇ or 2 * ⁇ or 5/2 * ⁇ or 3 * ⁇ etc. and preferably 3/2 * ⁇ or 5/2 * ⁇ or 7/2 * ⁇ or 9/2 * ⁇ ⁇ etc.
  • the width of the ultrasonic oscillator according to the invention is at least ⁇ .
  • the length of the ultrasonic oscillator according to the invention is k* ⁇ /2, where k is a natural even number greater than or equal to 2. The length in these cases is therefore ⁇ or 2 * ⁇ or 3 * ⁇ etc. It has been shown with such a choice that very uniform sine waves can be obtained in the direction of the length of the ultrasonic oscillator. But even with a length of 3/2* ⁇ , 5/2* ⁇ , 7/2* ⁇ , 9/2* ⁇ , i.e.
  • the effect according to the invention can be achieved, namely that essentially constant oscillation amplitudes can be observed in the width direction over the length of the ultrasonic oscillator. In both cases, the sine waves are superimposed by very little to no amplitude fluctuations in the width direction.
  • the ultrasonic oscillator according to the invention is particularly preferably designed to be homogeneous throughout and in particular has no slots or completely enclosed recesses. This achieves a uniform oscillation excitation of the ultrasonic oscillator.
  • the prior art includes plate oscillators in the form of welding sonotrodes, in which only longitudinal waves are to be conducted out of the ultrasonic oscillator. Transverse waves are to be suppressed by the previously known recesses and/or slots.
  • the prior art results in plate-shaped welding sonotrodes that oscillate back and forth in a flat manner as a whole, so that no oscillations build up across the plate itself.
  • longitudinal waves are also desired, but no slots or recesses are necessary. Rather, longitudinal oscillations build up in the ultrasonic oscillators according to the invention that extend across the entire plate, so that a flat back and forth oscillation of the ultrasonic oscillator as a whole does not occur.
  • half the wavelength i.e. ⁇ /2
  • a higher excitation frequency must be selected in order to set the ultrasonic oscillator into harmonic oscillations.
  • the excitation frequency is, for example, roughly 30 kHz, and for ⁇ /2 in the range of 50 mm, roughly 35 kHz.
  • An advantageous width of the ultrasonic oscillator according to the invention is at least 100 mm and preferably at least 500 mm. Larger widths are easily possible, for example those of at least 1000 mm or 2000 mm or 3000 mm or even wider. Even at these very large widths, the excitation 6 UMG-10429a-22 10/12/2023 an ultrasonic oscillator according to the invention with high oscillation amplitudes has been realized.
  • the advantageous lengths of the ultrasonic oscillator according to the invention are also in the range of several hundred to several thousand millimeters.
  • the ultrasonic oscillator according to the invention is cuboid-shaped. It has been shown that with this simple geometric design, ultrasonic oscillators with harmonic longitudinal waves with an oscillation amplitude that is constant in the width direction and sinusoidally extending in the length direction are possible, with which it is possible to decouple the energy of the longitudinal waves from the ultrasonic oscillator.
  • the one-piece ultrasonic oscillator comprises at least a first and a second cuboid section, wherein these two cuboid sections adjoin one another on their width sides and each have a width that is a multiple of ⁇ /2.
  • These two cuboid sections are arranged offset from one another in the width direction, whereby the first cuboid section on one side - viewed in the width direction - projects one cuboid section beyond the second cuboid section.
  • the ultrasonic oscillator also viewed in its width direction - the relationships are reversed, ie the second cuboid section projects beyond the first cuboid section.
  • the cuboid sections that project in the width direction each have 7 UMG-10429a-22 10/12/2023 cuboid sections have a width of ⁇ /4 or an odd multiple of ⁇ /4.
  • the oscillation peaks and oscillation valleys of longitudinal oscillations of one cuboid section excited in the length direction of the ultrasonic oscillator - seen across the width of the ultrasonic oscillator - can be largely or completely aligned with the corresponding oscillation peaks and oscillation valleys of the other cuboid section.
  • a largely uniform sinusoidal wave front is therefore built up in the length direction of the ultrasonic oscillator across its width.
  • the at least two cuboid sections are the same width, so that the two cuboid sections that protrude beyond the first and second cuboid sections are also the same width.
  • the width of the two cuboid sections is preferably ⁇ /4 each.
  • the ultrasonic oscillator otherwise being designed the same - one of the two cuboid sections projects beyond the adjacent cuboid section at both ends in the width direction by one cuboid section each.
  • the two cuboid sections of the cuboid sections projecting in the width direction have a width of ⁇ /4 or an odd multiple of ⁇ /4.
  • each cuboid section is advantageously ⁇ /2 or a multiple of ⁇ /2.
  • This design enables precise coordination of the vibration waves propagating in the length direction of the ultrasonic oscillator. 8 UMG-10429a-22 October 12, 2023 It is also preferred that the at least two cuboid sections are of equal length.
  • the ultrasonic oscillator consists of several block sections that adjoin one another in the length direction, each block section being formed from at least two of the aforementioned cuboid sections.
  • a preferred material for the ultrasonic oscillator according to the invention is aluminum.
  • the one-piece plate-shaped ultrasonic oscillator is then preferably milled out of a single aluminum block.
  • Alternative materials for the ultrasonic oscillator are steel, a steel alloy or titanium.
  • the ultrasonic oscillator is preferably manufactured by milling.
  • the invention also relates to a device for generating high-frequency vibrations with at least one ultrasonic converter and an ultrasonic oscillator, as described above, wherein the ultrasonic oscillator is connected to the at least one ultrasonic converter.
  • the ultrasonic converter can be designed in particular as an electromechanical (e.g. piezoelectric or magnetostrictive) energy converter.
  • the ultrasonic oscillator can then be used in particular as an ultrasonic tool.
  • the converter serves to transform electrical alternating voltages into mechanical alternating strains and in this way to excite structural vibrations in the mechanically coupled ultrasonic oscillator, which then transmits its vibrations to a workpiece connected to it.
  • 9 UMG-10429a-22 October 12, 2023 It is also advantageous to place a so-called booster between the ultrasonic converter and the ultrasonic oscillator, with which an amplitude translation from the ultrasonic converter to the ultrasonic oscillator can be achieved. Both ultrasonic converters and boosters are widely known from the prior art.
  • the at least one ultrasonic converter is coupled to the at least one ultrasonic oscillator from the top or bottom.
  • the ultrasonic converter is preferably coupled in a vibration node (which becomes an antinode after half an oscillation) of the ultrasonic oscillator in order to achieve optimal energy input.
  • the at least one ultrasonic converter is preferably coupled to the ultrasonic converter at a distance of ⁇ /4 or a multiple of ⁇ /4 from the width edge running in the width direction and also from the length edge of the ultrasonic oscillator running in the length direction. It has been shown that such a connection point for the ultrasonic converter to the ultrasonic oscillator enables optimal vibration excitation.
  • the ultrasonic converter couples to a point on the ultrasonic oscillator that oscillates with a maximum deflection amplitude. It is particularly preferred that only a single ultrasonic converter is coupled to the ultrasonic oscillator from the top or bottom for the purpose of exciting the longitudinal waves mentioned. Such a design is in particular in contrast to cleaning oscillators in which a large number of ultrasonic converters are coupled to one side of the ultrasonic oscillator, usually on the side facing away from the cleaning bath.
  • the at least one ultrasonic oscillator is coupled to a device that oscillates in the thickness direction of the ultrasonic oscillator, wherein this device can be an embossing tool, a stamp or an erosion tool. Due to the high amplitudes that can be achieved by means of the invention and the high energy output to a workpiece to be processed, a high level of efficiency can be achieved by means of a device designed in this way.
  • a transport device is preferably assigned to the bottom or top of the at least one ultrasonic oscillator, which enables at least one material web to be passed through the device and in particular a passage between the ultrasonic oscillator and the transport device.
  • the transport device preferably comprises one or more actively and/or passively driven rollers or cylinders.
  • a removal device is provided downstream of the ultrasonic oscillator, with a counter plate being assigned to the top or bottom of the ultrasonic oscillator in order to guide one or more material webs between the ultrasonic oscillator acting as a working tool and the counter plate.
  • the invention further relates to the use of an ultrasonic oscillator as described above for or in a device as described above.
  • the invention also relates to a method for operating a device as described above, which is used for joining at least two material webs, for solidifying, for drying, for embossing or smoothing at least one material web, for heating, for filtering, for separating material, for cleaning sewage sludge and/or for converting mechanical energy into electrical energy, in particular by means of piezoelectric transducers.
  • a method according to the invention is characterized in that a flatly extending overall web made up of several material webs is connected to one another by means of a device according to the invention.
  • the length direction of the ultrasonic vibrator therefore corresponds to the transport direction of the entire web.
  • an adhesive is applied to one of the material webs, either flatly or only in regions, advantageously in a pattern, whereupon the entire web is passed between the bottom or top of the ultrasonic vibrator and a pressing counter tool, in particular actively or passively driven rollers or cylinders.
  • the entire material web can, for example, be pulled through the device by downstream take-off rollers.
  • the adhesive Due to the high energy input including the large vibration amplitude that can be coupled in by the ultrasonic oscillator, the adhesive is melted in an optimal manner and the material webs are connected to one another by pressure to form a complete web.
  • the longer the ultrasonic oscillator i.e. the longer the transport path along the ultrasonic oscillator, the greater the working length and the more evenly and reliably the material webs can be connected.
  • Fig.1a-1c a top view, a side view and a front view of a first embodiment of an ultrasonic vibrator according to the invention
  • Fig.2 a front view of the ultrasonic vibrator of Fig.1 with connected ultrasonic excitation devices
  • Fig.3a, 3b a simulated thickness oscillation of a second embodiment of an ultrasonic vibrator at a first and a second point in time
  • Fig.4a, 4b a simulated thickness oscillation of a third embodiment of an ultrasonic vibrator at a first and a second point in time
  • Fig.5a-5c a top view, a side view and a front view of a fourth embodiment of an ultrasonic vibrator according to the invention
  • Fig.6 a front view of the ultrasonic vibrator of Fig.5 with connected ultrasonic excitation devices
  • Fig.7a-7d a top view, a side view, a front view and a perspective top view of
  • an ultrasonic oscillator 1 according to the invention is shown in plan view, side view and front view.
  • the ultrasonic oscillator 1 is made from a piece of metal in the form of a cuboid, preferably from aluminum and according to advantageous alternatives from steel or titanium. It has no slots or completely enclosed recesses, which are used in the prior art in particular to suppress transverse waves.
  • 14 UMG-10429a-22 10/12/2023 ger in this respect, due to its fundamentally different geometric structure, in particular the adjustment of the thickness to half the wavelength ⁇ /2, no transverse waves occur which disturb the vibration behavior.
  • the ultrasonic vibrator 1 has a thickness D in the thickness direction DR, a length L in the length direction LR and a width B in the width direction BR.
  • the thickness D of the ultrasonic vibrator 1 shown in Fig.1 is 1 ⁇ /2 and the length L 2 * ⁇ .
  • the thickness D is m * ⁇ /2, with m as a natural odd number, and the length (L) n * ⁇ /2, with n as a natural number greater than or equal to 2.
  • the width B of the ultrasonic vibrator 1 in Fig.1 is 9/2 * ⁇ .
  • the wavelength ⁇ mentioned is considered here in the length direction LR of the ultrasonic vibrator 1.
  • ⁇ is the wavelength at which the ultrasonic oscillator 1 - when appropriately excited - is able to oscillate harmoniously in the form of a longitudinal wave, which is reflected as thickness oscillations (see also below). All dimensions of the ultrasonic oscillator 1 in Fig. 1 are designed according to the above for half the wavelength ⁇ /2 or a multiple of ⁇ /2, namely the thickness D to ⁇ /2, the length L to 2 * ⁇ and the width B to 9/2 * ⁇ .
  • the said wavelength ⁇ is preferably between 180 mm and 240 mm, so that ⁇ /2 is between 90 and 120 mm.
  • the width B of the ultrasonic oscillator is advantageously at least 100 mm, preferably at least 500 mm, for example at least 1000 mm or at least 2000 mm.
  • Fig.2 shows a device 50 with an ultrasonic oscillator 1 and an ultrasonic converter 12 connected to the ultrasonic oscillator 1, which in turn is connected to a power supply 10. Furthermore 15 UMG-10429a-22 12.10.2023
  • a booster 14 is connected between the ultrasonic converter 12 and the ultrasonic oscillator 1 in order to amplify the amplitude provided by the converter 12 and to transmit it to the ultrasonic oscillator 1.
  • a booster 14 is not necessarily present.
  • the excitation frequency is advantageously selected in the range between 19 and 22 kHz for a wavelength ⁇ in the range of 90 and 120 mm in such a way that the harmonic oscillations according to the invention are established.
  • the booster 14 is coupled to the ultrasonic oscillator 1 at the connection point 14a (see also Fig. 1a), which is spaced from its longitudinal edge 1a (i.e. the edge of the ultrasonic oscillator 1 extending in the longitudinal direction LR) ⁇ /2 and from its width edge 1b (i.e. the edge of the ultrasonic oscillator 1 extending in the width direction BR).
  • the distance of the connection point 14a to the width edge and to the length edge is each selected to be ⁇ /4 or a multiple thereof.
  • the device 50 preferably comprises only a single ultrasonic converter 12, which is accordingly coupled - here via the booster 14 - to the top of the ultrasonic oscillator 1, alternatively to its bottom.
  • the ultrasonic oscillators 1 according to the invention oscillate in the form of thickness oscillations with oscillation amplitudes that are essentially constant in the width direction BR over the length L of the ultrasonic oscillator 1. These vibration characteristics can be seen, for example, in Fig.3a and 3b, in which the thickness vibrations of a second embodiment of an ultrasonic oscillator 1 are shown at two different points in time in a three-dimensional computer simulation.
  • the thickness D of the ultrasonic oscillator 1 was given as ⁇ /2, the length as 9/2* ⁇ 16 UMG-10429a-22 12.10.2023 and the width is set at 2 * ⁇ + 5%.
  • the vibration amplitude is essentially the same for each length section (along the length direction LR) in the width direction BR.
  • the number of vibrations in the length direction LR is 4.5* ⁇ or 9/2* ⁇ in accordance with the selected length L of the ultrasonic vibrator.
  • a third embodiment of an ultrasonic vibrator 1 according to the invention with a thickness of ⁇ /2, a length L of 3/2 * ⁇ and a width of 9/2 * ⁇ is shown in a computational simulation.
  • thickness oscillations which are also referred to as harmonic longitudinal waves extending in the length direction LR, are excited, in which the respective amplitude in the width direction BR is essentially constant.
  • a fourth embodiment of an ultrasonic oscillator 1 according to the invention is shown in Figs. 5a-5c.
  • This ultrasonic oscillator 1 has a first and a second cuboid section 2, 3, which adjoin one another in one piece on their mutually facing broad sides 2a, 3a and each have a width B2 and B3 respectively.
  • These two widths B2 and B3 are each 9/4* ⁇ (in general: (n* ⁇ /2 + ⁇ /4) with n as a natural number).
  • the special feature here is that the two cuboid sections 2, 3 are offset from one another in the width direction BR, with the cuboid sections 2', 3' protruding in the width direction BR having a width B2, B3 of ⁇ /4 (in general: m* ⁇ /4 with m as a natural odd number).
  • the two widths B2, B3 do not have to be identical, but they are in this case.
  • the total width B of the ultrasonic oscillator 1 is therefore 5/2 * ⁇ .
  • the length of the two cuboid sections 2, 3 is each ⁇ /2, so that the length L of the ultrasonic oscillator 1 is ⁇ . 17 UMG-10429a-22 12.10.2023
  • Fig.6 similar to Fig.2, a coupling of an ultrasonic converter 12 connected to a voltage source 10, with the interposition of a booster 14, to a connection point 14a of the ultrasonic converter 1 is shown.
  • the connection point 14a is 3/4 * ⁇ from the longitudinal edge of the cuboid section 2.
  • Figs.7a-7d show a fifth embodiment of an ultrasonic vibrator 101 according to the invention.
  • two block sections 8 are arranged one behind the other in the length direction LR, each block section 8 consisting of an ultrasonic vibrator 1 according to Fig.6 with two cuboid sections 2, 3 each. Two such block sections 8 adjoin one another in the length direction LR in the embodiment of Fig.6.
  • the ultrasonic oscillator 101 according to Fig.7 also has the inventive vibration behavior in the thickness direction, i.e. in particular the absence of vibration nodes in the width direction BR.
  • Figs.8a and 8b again in a three-dimensional computer simulation, the thickness vibrations of a sixth embodiment of an ultrasonic oscillator 101 are shown at two different points in time.
  • the ultrasonic oscillator 101 in Fig.8 is basically constructed in the same way as that in Fig.7, ie it also consists of two block sections 8.
  • the thickness D was set at ⁇ /2, the length L at 2* ⁇ and the width B at 9/2* ⁇ .
  • the vibration amplitude is essentially the same at every point along the length direction LR in the width direction BR.
  • Figs. 9a and 9b show a slightly perspective view of the ultrasonic oscillator 101 of Figs. 8a and 8b with a connected booster 14. It can be seen that the booster 14 is attached to a connection point 14a of the ultrasonic oscillator 101, which has the maximum oscillation amplitude (cf. Figs. 9a and 9b).
  • Figs. 10-12 show a seventh, eighth and ninth embodiment of an ultrasonic oscillator 201 according to the invention. The seventh embodiment of Fig.
  • each block section 8 in turn being made up of two cuboid sections 2, 3 (cf. Fig. 7).
  • the difference to the embodiment of Fig.7 is that the two cuboid sections 2, 3 each have a width B4, B5 of n* ⁇ /2, with n being a natural number, with the cuboid section 3 projecting beyond the adjacent cuboid section 2 at both ends in the width direction by a cuboid subsection 3' of width ⁇ /4 (generally m * ⁇ /4 with m being a natural odd number).
  • each cuboid section 2, 3 is ⁇ /2 and thus the length of the ultrasonic oscillator 201 is 2* ⁇ in total, while its width B corresponds to the width B5 and is thus 7/2* ⁇ .
  • the thickness D of the ultrasonic oscillator 201 is, for example, ⁇ /2, which is preferred, or 3/2* ⁇ .
  • An ultrasonic oscillator according to the invention, not shown here, can also consist of just one block section 8, as shown in Fig.10.
  • the eighth embodiment of an ultrasonic vibrator 201 according to the invention according to Fig.11 has three cuboid sections 3, 2, 3, wherein the front and rear cuboid sections 3 - seen in the longitudinal direction LR - 19 UMG-10429a-22 12.10.2023 are identically designed. These two cuboid sections 3 protrude beyond the middle cuboid section 2 at their respective two ends in the width direction BR by one cuboid section 3' of width ⁇ /4 (generally m* ⁇ /4 with m as a natural odd number).
  • each cuboid section 2, 3 is presently ⁇ /2 and thus the length of the ultrasonic oscillator 201 is 3/2* ⁇ in total, while its width B is 7/2* ⁇ in total.
  • the thickness D of the ultrasonic oscillator 201 is, for example, ⁇ /2 or 3/2* ⁇ .
  • the ninth embodiment of an ultrasonic vibrator 201 according to the invention according to Fig. 12 also has three cuboid sections 2, 3, 2 which are integrally adjacent to one another, the front and rear cuboid sections 2 being identical in design when viewed in the longitudinal direction LR.
  • the middle cuboid section 3 projects beyond the two cuboid sections 2 in the width direction BR at its respective two ends by a cuboid section 3' of width ⁇ /4 (in general: m* ⁇ /4 with m as a natural odd number).
  • the length of each cuboid section 2, 3 is ⁇ /2 in the present case and thus the length of the ultrasonic vibrator 201 is 3/2* ⁇ in total, while its width B is 7/2* ⁇ in total.
  • the thickness D of the ultrasonic vibrator 201 is, for example, ⁇ /2 or 3/2* ⁇ .
  • each of the two tools 26 is designed as a stamp 27 and faces the underside of the ultrasonic oscillator 1.
  • a material web M is fed in the transport direction T between the ultrasonic oscillator 1 and the stamp 27.
  • Fig. 14 shows a device 50 for connecting two material webs M1 and M2.
  • An ultrasonic oscillator 101 according to the invention which is designed in this case according to Fig. 7, is excited (by means of an ultrasonic converter 12 (not shown)) to oscillate in the thickness direction, as shown, for example, in Figs. 3a, 3b.
  • a transport device 20 consisting of four transport rollers 20a arranged one behind the other in the transport direction T, which take on two functions, is provided as a counter tool.
  • a counter plate 22 forms a tool that extends over the entire length of the ultrasonic vibrator 101, which in this case is designed according to the embodiment of Fig. 7. Holes can also be present in the counter plate 22 (perforated plate) so that steam or liquids can escape from the space between the ultrasonic vibrator 101 and the counter plate 22.

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  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

L'invention concerne un transducteur à ultrasons (1 ; 101 ; 201) destiné à produire des vibrations haute fréquence, le transducteur à ultrasons (1 ; 101 ; 201) étant formé d'une seule pièce plane avec une épaisseur (D) dans le sens de l'épaisseur (DR), une longueur (L) dans le sens de la longueur (LR) et une largeur (B) dans le sens de la largeur (BR). Selon l'invention, l'épaisseur (D) dudit transducteur à ultrasons est m·λ/2, m étant un nombre impair naturel, et la longueur (L) est n·λ/J2, n étant un nombre naturel supérieur ou égal à 2, le transducteur à ultrasons (1 ; 101 ; 201) pouvant être excité en initiant des vibrations mécaniques haute fréquence pour former une ou plusieurs vibrations d'épaisseur, qui se succèdent ensuite dans le sens de la longueur (LR) du transducteur ultrasonore (1 ; 101 ; 201), avec une longueur d'onde λ mesurée dans le sens de la longueur (LR) et également avec des amplitudes de vibration qui sont sensiblement constantes dans le sens de la largeur (BR) vues sur la longueur (L) du transducteur ultrasonore (1 ; 101 ; 201). En outre, l'invention concerne un dispositif (50) pour produire des vibrations haute fréquence, ledit dispositif comprenant au moins un convertisseur à ultrasons (12) et au moins un transducteur à ultrasons (1 ; 101 ; 201) relié au convertisseur à ultrasons (12), et concerne l'utilisation dudit transducteur et un procédé.
PCT/EP2023/078404 2022-10-13 2023-10-12 Transducteur à ultrasons, dispositif doté d'un transducteur à ultrasons et utilisation d'un transducteur à ultrasons, et procédé correspondant WO2024079284A1 (fr)

Applications Claiming Priority (2)

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DE102022126738.5 DE102022126738A9 (de) 2022-10-13 Ultraschallschwinger, Vorrichtung mit und Verwendung von einem Ultraschallschwinger sowie entsprechende Verfahren
DE102022126738.5A DE102022126738A1 (de) 2022-10-13 2022-10-13 Ultraschallschwinger, Vorrichtung mit und Verwendung von einem Ultraschallschwinger sowie entsprechende Verfahren

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WO2024079284A1 true WO2024079284A1 (fr) 2024-04-18

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468125A2 (fr) * 1990-07-26 1992-01-29 Emerson Electric Co. Fabrication des hornes de haute fréquence
JPH06881A (ja) * 1992-06-18 1994-01-11 Seidensha Denshi Kogyo Kk 複合振動用工具ホ−ン
US20040013449A1 (en) * 2001-01-22 2004-01-22 Matsushita Electric Industrial Co., Ltd. Ultrasonic vibration tool, fixing device, and heating device
WO2011009959A1 (fr) * 2009-07-24 2011-01-27 Schober Gmbh Werkzeug- Und Maschinenbau Dispositif servant au traitement d'une bande de matériau au moyen d'ultrasons et d'un support pour la sonotrode
DE102010005230A1 (de) * 2010-01-21 2011-07-28 ATHENA Technologie Beratung GmbH, 33106 Vorrichtung und Verfahren zur Ultraschall-Materialbearbeitung
WO2015110347A1 (fr) * 2014-01-24 2015-07-30 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ensemble convertisseur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027533C2 (de) 1980-07-21 1986-05-15 Telsonic Aktiengesellschaft für elektronische Entwicklung und Fabrikation, Bronschhofen Verfahren zur Erzeugung und Abstrahlung von Ultraschallenergie in Flüssigkeiten sowie Ultraschallresonator zur Ausführung des Verfahrens
JPS58196874A (ja) 1982-05-12 1983-11-16 多賀電気株式会社 超音波処理装置
US5119840A (en) 1986-04-07 1992-06-09 Kaijo Kenki Co., Ltd. Ultrasonic oscillating device and ultrasonic washing apparatus using the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468125A2 (fr) * 1990-07-26 1992-01-29 Emerson Electric Co. Fabrication des hornes de haute fréquence
JPH06881A (ja) * 1992-06-18 1994-01-11 Seidensha Denshi Kogyo Kk 複合振動用工具ホ−ン
US20040013449A1 (en) * 2001-01-22 2004-01-22 Matsushita Electric Industrial Co., Ltd. Ultrasonic vibration tool, fixing device, and heating device
WO2011009959A1 (fr) * 2009-07-24 2011-01-27 Schober Gmbh Werkzeug- Und Maschinenbau Dispositif servant au traitement d'une bande de matériau au moyen d'ultrasons et d'un support pour la sonotrode
DE102010005230A1 (de) * 2010-01-21 2011-07-28 ATHENA Technologie Beratung GmbH, 33106 Vorrichtung und Verfahren zur Ultraschall-Materialbearbeitung
WO2015110347A1 (fr) * 2014-01-24 2015-07-30 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ensemble convertisseur

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