JP2007136382A - Method for diagnosing deterioration of ultrasonic vibration sieve wire net - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for diagnosing the deterioration of ultrasonic vibration sieve wire nets which accurately diagnoses the deterioration of wire nets. <P>SOLUTION: The deterioration of a wire net 1a2 is diagnosed based on a resonance frequency of an ultrasonic vibration sieve 1. In more detail, for example, when a difference ΔP (=P0-P1) is larger than a prescribed threshold value ΔP0, the wire net 1a2 is determined to deteriorate, wherein P1 is a peak value of a resonance frequency of the ultrasonic vibration sieve 1 on which the wire net 1a2 to be diagnosed is mounted and P0 is a peak value of a resonance frequency of the ultrasonic vibration sieve 1 on which a normal wire net 1a1 is mounted. When ΔP (=P0-P1) is smaller than the prescribed threshold value ΔP0, the wire net 1a2 is determined not to deteriorate, wherein ΔP is a difference between the peak values of the ultrasonic vibration sieve 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultrasonic vibration sieve mesh deterioration diagnosis method for diagnosing a deterioration state of a wire mesh of an ultrasonic vibration sieve, and more particularly to an ultrasonic vibration sieve mesh deterioration diagnosis method capable of accurately diagnosing the deterioration state of a wire mesh. .

  2. Description of the Related Art Conventionally, there is known an ultrasonic vibrating screen configured such that a wire mesh is ultrasonically vibrated by an ultrasonic vibrator. An example of this type of ultrasonic vibrating screen is described in FIG. 4 of Japanese Patent Application Laid-Open No. 11-253883, for example. It has been confirmed through research by the present inventors that when the wire mesh of such an ultrasonic vibration sieve is used over a long period of time, the wire of the wire mesh rubs and the surface of the wire is swollen or the wire is thinned and broken. It was done.

  By the way, in the past, since there was no method for accurately diagnosing the deterioration state of the wire mesh of the ultrasonic vibrating screen, for example, the deterioration state of the wire mesh was estimated based on the usage period of the wire mesh, and it was determined that the deterioration was found. Wire netting was being exchanged.

  However, since the progress of the degradation of the wire mesh varies from wire mesh to wire mesh, if the wire mesh replacement cycle is set to a relatively short period, the wire mesh that has not yet deteriorated will be replaced. Running costs will increase. On the other hand, if the wire mesh replacement cycle is set to a relatively long period, the wire mesh is damaged when the ultrasonic vibrating screen is operated, and as a result, wire mesh fragments are mixed into the object to be processed by the ultrasonic vibrating screen. There is a fear.

  For these reasons, a method capable of accurately diagnosing the deterioration state of the wire mesh has been desired.

FIG. 4 of Japanese Patent Laid-Open No. 11-253883

  In view of the above problems, an object of the present invention is to provide an ultrasonic vibration sieving mesh deterioration diagnosis method capable of accurately diagnosing a deterioration state of a wire mesh.

  More specifically, the present invention detects ultrasonic deterioration of the wire mesh at an early stage, thereby reducing the possibility that wire mesh fragments may be mixed into the object to be processed by the ultrasonic vibration sieve. It is an object of the present invention to provide a method for diagnosing vibration sieve mesh.

  The present inventors paid attention to the resonance frequency of the ultrasonic vibration sieve and observed a change in the peak value of the resonance frequency during operation of the ultrasonic vibration sieve. As a result, it was confirmed that the peak period of the resonance frequency of the ultrasonic vibration sieve changes when the wire mesh of the ultrasonic vibration sieve is used for a long time and the metal mesh is deteriorated. Specifically, when the wire mesh was confirmed when the peak value of the resonance frequency of the ultrasonic vibration sieve changed greatly, it was confirmed that the wire mesh was not broken, although the wire mesh was deteriorated. In other words, the present inventors have intensively researched and found a method for accurately diagnosing that the wire net is deteriorated before the wire mesh is broken and the pieces of the wire mesh are mixed into the object to be processed.

  According to the first aspect of the present invention, in the ultrasonic vibration sieve mesh deterioration diagnosis method for diagnosing the deterioration state of the wire mesh of the ultrasonic vibration sieve, the deterioration state of the wire mesh is diagnosed based on the resonance frequency of the ultrasonic vibration sieve. An ultrasonic vibration sieving screen deterioration diagnosis method is provided.

  According to the invention described in claim 2, the peak value of the resonance frequency of the ultrasonic vibration sieve to which the wire mesh to be diagnosed is attached and the peak value of the resonance frequency of the ultrasonic vibration sieve to which the normal wire mesh is attached The ultrasonic vibration sieving screen deterioration diagnosis method according to claim 1, wherein the deterioration state of the wire mesh to be diagnosed is diagnosed based on a difference from

  According to the invention described in claim 3, the ultrasonic vibrating screen is caused to resonate at the time of diagnosis of deterioration of the ultrasonic vibrating screen by using the ultrasonic vibrator for generating ultrasonic vibration when the ultrasonic vibrating screen is operated. The ultrasonic vibration sieving mesh deterioration diagnosis method according to claim 1 or 2, characterized in that it is provided.

  According to the invention described in claim 4, the microphone for collecting the resonance frequency of the ultrasonic vibration sieve at the time of ultrasonic vibration sieve mesh deterioration diagnosis is disposed on the opposite side of the ultrasonic vibrator across the center of the metal mesh. The ultrasonic vibration sieving mesh deterioration diagnosis method according to claim 3 is provided.

  According to invention of Claim 5, the deterioration state of a metal mesh is diagnosed at the time of ultrasonic vibration sieve operation, The ultrasonic vibration sieve mesh deterioration diagnostic method as described in any one of Claims 1-4 characterized by the above-mentioned. Is provided.

  In the ultrasonic vibration sieve mesh deterioration diagnosis method according to claims 1 and 2, the deterioration state of the metal mesh is diagnosed based on the resonance frequency of the ultrasonic vibration sieve. Preferably, diagnosis is performed based on the difference between the peak value of the resonance frequency of the ultrasonic vibrating screen to which the wire mesh to be diagnosed is attached and the peak value of the resonance frequency of the ultrasonic vibrating screen to which the normal wire mesh is attached. The deterioration state of the target wire mesh is diagnosed.

  Therefore, according to the ultrasonic vibration sieving mesh deterioration diagnosis method according to claims 1 and 2, the deterioration state of the wire mesh is more accurately determined than when the deterioration state of the wire mesh is estimated based on, for example, the usage period of the wire mesh. Can be diagnosed. Specifically, according to the ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 1 and 2, by detecting the deterioration of the metal mesh at an early stage, the wire mesh is applied to the object to be processed by the ultrasonic vibration sieve. It is possible to reduce the possibility that the fragments will be mixed.

  In the ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 3, an ultrasonic vibrator is used for generating ultrasonic vibration when the ultrasonic vibration sieve is operated, and the ultrasonic vibration sieve is used for diagnosis of ultrasonic vibration sieve mesh deterioration. Is resonated. Specifically, at the time of ultrasonic vibration sieve mesh deterioration diagnosis, the ultrasonic vibration sieve is resonated by the ultrasonic vibrator, and the deterioration state of the metal mesh is diagnosed based on the resonance frequency of the ultrasonic vibration sieve at that time.

  Therefore, according to the ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 3, it is necessary to provide means for resonating the ultrasonic vibration sieve separately from the ultrasonic vibrator at the time of ultrasonic vibration sieve mesh deterioration diagnosis Can be eliminated.

  In the ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 4, the microphone for collecting the resonance frequency of the ultrasonic vibration sieve at the time of ultrasonic vibration sieve mesh deterioration diagnosis is separated from the center of the wire mesh by the ultrasonic vibrator. Located on the opposite side. Therefore, the deterioration state of the wire mesh can be diagnosed more accurately than when the microphone is arranged at another position.

  In the ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 5, the deterioration state of the metal mesh is diagnosed when the ultrasonic vibration sieve is in operation. That is, the deterioration state of the wire mesh is diagnosed when the object to be processed is screened by the wire mesh.

  Therefore, according to the ultrasonic vibration sieve mesh deterioration diagnosis method according to the fifth aspect, it is possible to eliminate the necessity of stopping the operation of the ultrasonic vibration sieve in order to diagnose the deterioration state of the metal mesh.

  Hereinafter, a first embodiment of the ultrasonic vibration mesh screen deterioration diagnosis method of the present invention will be described. FIG. 1 is a diagram showing an ultrasonic vibration screen mesh deterioration diagnosis device to which the ultrasonic vibration screen mesh deterioration diagnosis method of the first embodiment is applied. In FIG. 1, reference numeral 1 denotes an ultrasonic vibration sieve, and 2 denotes an ultrasonic vibration sieve mesh deterioration diagnosis device for diagnosing the deterioration state of the wire mesh of the ultrasonic vibration sieve 1.

  In detail, in FIG. 1, 1a has shown the principal part of the ultrasonic vibration sieve 1, 1b is the supply for supplying the product as a to-be-processed object before sieving processing by the ultrasonic vibration sieve 1 Showing mouth. Reference numeral 1c denotes a discharge port for discharging a product as an object to be processed which has been subjected to a sieving process by the ultrasonic vibration sieve 1 and passed through the wire mesh of the ultrasonic vibration sieve 1. Reference numeral 1d denotes a discharge port for discharging a recycled product as an object to be processed that has been screened by the ultrasonic vibration sieve 1 and has not passed through the wire mesh of the ultrasonic vibration sieve 1.

  In FIG. 1, 2a indicates a microphone for collecting the resonance frequency of the ultrasonic vibrating screen 1, 2b indicates an FFT analyzer connected to the microphone 2a, and 2c indicates an FFT analyzer 2b. Reference numeral 2d denotes a connected timer, and reference numeral 2d denotes a computer connected to the FFT analyzer 2b.

  FIG. 2 is a schematic configuration diagram of a main part 1a of the ultrasonic vibration sieve 1 shown in FIG. In FIG. 2, 1a1 shows an ultrasonic transducer connected to an ultrasonic oscillator (not shown) to generate ultrasonic vibration. Reference numeral 1a2 denotes a substantially circular wire mesh that is vibrated by the ultrasonic vibration generated by the ultrasonic vibrator 1a1, and 1a3 denotes a mesh frame for supporting the wire mesh 1a2. In FIG. 2, only a part of the wire mesh 1a2 is shown for easy understanding of the lower structure of the wire mesh 1a2, but actually, the wire mesh 1a2 is stretched over the entire surface of the substantially circular mesh frame 1a3. Has been.

  In FIG. 2, reference numeral 1a4 denotes a resonance ring for transmitting ultrasonic vibration generated by the ultrasonic transducer 1a1 to the wire mesh 1a2 by resonance action, and 1a5 connects the mesh frame 1a3 and the resonance ring 1a4. The support plate for is shown.

  As shown in FIGS. 1 and 2, in the ultrasonic vibration sieve 1, the product as the object to be processed supplied from the supply port 1 b is subjected to a sieving process by the wire mesh 1 a 2 that is ultrasonically vibrated. Subsequently, the to-be-processed object which passed the metal-mesh 1a2 is collect | recovered as a product via the discharge port 1c. On the other hand, the object to be processed that has not passed through the wire mesh of the ultrasonic vibration sieve 1 is collected as a recycled product through the discharge port 1d.

  If the wire mesh 1a2 is damaged during operation of the ultrasonic vibrating screen 1, fragments of the wire mesh 1a2 are mixed into the product collected through the discharge port 1c or the recycled product collected through the discharge port 1d. There is a risk that.

  Therefore, in the ultrasonic vibration sieve mesh deterioration diagnosis method of the first embodiment, the deterioration state of the metal mesh 1a2 is diagnosed using the ultrasonic vibration sieve mesh deterioration diagnosis device 2 shown in FIG. The deterioration of the wire mesh 1a2 is detected before it is done. Next, by replacing the deteriorated wire mesh 1a2 with a normal wire mesh 1a2, fragments of the wire mesh 1a2 are mixed into a product collected through the discharge port 1c or a recycled product collected through the discharge port 1d. This can reduce the risk of being lost.

  As a result of research by the present inventors, the use period of the wire mesh 1a2 of the ultrasonic vibration sieve 1 becomes longer, and when the wire mesh 1a2 deteriorates, the wire mesh 1a2 is broken and the wire mesh of the wire mesh 1a2 is broken before ultrasonic vibration. It was confirmed that the peak value of the resonance frequency of the sieve 1 changed greatly.

  Therefore, in the ultrasonic vibration sieve mesh deterioration diagnosis method according to the first embodiment, the deterioration state of the metal mesh 1a2 is diagnosed based on the peak value of the resonance frequency of the ultrasonic vibration sieve 1.

  Specifically, in the ultrasonic vibration sieve mesh deterioration diagnosis method of the first embodiment, the resonance frequency peak value P0 of the normal vibration mesh 1a1, that is, the ultrasonic vibration sieve 1 to which the non-degraded metal mesh 1a1 is attached. Is stored in advance by the ultrasonic vibration sieving mesh deterioration diagnosis device 2 (microphone 2a, FFT analysis device 2b, timer 2c, computer 2d).

  Furthermore, in the ultrasonic vibration sieve mesh deterioration diagnosis method according to the first embodiment, the peak value P1 of the resonance frequency of the ultrasonic vibration sieve 1 to which the diagnosis target metal mesh 1a2 is attached is the ultrasonic vibration sieve mesh deterioration diagnosis device. 2 is calculated. Next, the peak value P1 of the resonance frequency of the ultrasonic vibration sieve 1 to which the wire mesh 1a2 to be diagnosed is attached and the peak value P0 of the resonance frequency of the ultrasonic vibration sieve 1 to which the normal wire mesh 1a1 is attached are: Comparison is made by the ultrasonic vibration sieve screen deterioration diagnosis device 2. As a result, when the difference ΔP (= P0−P1) in the peak value of the resonance frequency of the ultrasonic vibrating screen 1 is larger than the predetermined threshold value ΔP0, it is diagnosed that the wire mesh 1a2 has deteriorated. On the other hand, when the difference ΔP (= P0−P1) of the peak value of the resonance frequency of the ultrasonic vibrating screen 1 is equal to or less than the predetermined threshold value ΔP0, it is diagnosed that the wire mesh 1a2 is not deteriorated.

  As shown in FIG. 2, when the microphone 2a is arranged on the opposite side of the ultrasonic transducer 1a1 with the center C of the wire mesh 1a2 as shown in FIG. 2, the normal wire mesh 1a1 is attached. The difference between the peak value of the resonance frequency of the ultrasonic vibrating screen 1 and the peak value of the resonance frequency of the ultrasonic vibrating screen 1 to which the deteriorated wire mesh 1a1 is attached is the largest, that is, the deterioration diagnosis of the wire mesh 1a2. Was confirmed to be the most accurate.

  Therefore, in the ultrasonic vibration sieve mesh deterioration diagnosis device 2 to which the ultrasonic vibration sieve mesh deterioration diagnosis method of the first embodiment is applied, as shown in FIG. 2, the microphone 2a is separated from the center C of the metal mesh 1a2. It is arranged on the opposite side of the sound wave vibrator 1a1.

  On the other hand, according to research by the present inventors, the microphone 2a is rotated + 90 ° from the position shown in FIG. 2 around the center C of the wire mesh 1a2, is rotated + 180 °, and is rotated + 270 °. In either case, the resonance frequency peak value of the ultrasonic vibration sieve 1 to which the normal wire mesh 1a1 is attached and the resonance frequency of the ultrasonic vibration sieve 1 to which the deteriorated wire mesh 1a1 is attached are shown. It has been confirmed that a difference from the peak value of is generated, that is, it is possible to diagnose deterioration of the wire mesh 1a2.

  Therefore, in the ultrasonic vibration sieve mesh deterioration diagnosis apparatus (not shown) to which the ultrasonic vibration sieve mesh deterioration diagnosis method of the second embodiment is applied, from the position shown in FIG. 2 with the center C of the metal mesh 1a2 as the rotation center. For example, the microphone 2a can be disposed at a position rotated by + 90 °. Further, in the ultrasonic vibration sieve mesh deterioration diagnosis apparatus (not shown) to which the ultrasonic vibration sieve mesh deterioration diagnosis method of the third embodiment is applied, the center C of the metal mesh 1a2 is used as the rotation center from the position shown in FIG. For example, the microphone 2a can be disposed at a position rotated by + 180 °. Alternatively, in the ultrasonic vibration sieve mesh deterioration diagnosis apparatus (not shown) to which the ultrasonic vibration sieve mesh deterioration diagnosis method of the fourth embodiment is applied, from the position shown in FIG. 2 with the center C of the metal mesh 1a2 as the rotation center. For example, the microphone 2a can be arranged at a position rotated by + 270 °. Moreover, in the ultrasonic vibration sieve mesh deterioration diagnosis apparatus (not shown) to which the ultrasonic vibration sieve mesh deterioration diagnosis method of the fifth embodiment is applied, the ultrasonic vibration sieve 1 to which the normal metal mesh 1a1 is attached is used. Arbitrary position where a difference between the peak value of the resonance frequency and the peak value of the resonance frequency of the ultrasonic vibrating screen 1 to which the deteriorated wire mesh 1a1 is attached, that is, an arbitrary position where the deterioration diagnosis of the wire mesh 1a2 is possible. It is also possible to arrange the microphone 2a.

  Further, as a result of research by the present inventors, even when the supply of the object to be processed from the supply port 1b is not stopped, that is, even when the ultrasonic vibrating screen 1 is operated normally, the normal wire mesh 1a1 is attached. The difference between the peak value of the resonance frequency of the ultrasonic vibrating screen 1 and the peak value of the resonance frequency of the ultrasonic vibrating screen 1 to which the deteriorated wire mesh 1a1 is attached, that is, the deterioration diagnosis of the wire mesh 1a2 is possible. It was confirmed.

  Therefore, in the ultrasonic vibration sieve mesh deterioration diagnosis method according to the first embodiment, the deterioration state of the metal mesh 1a2 is diagnosed when the ultrasonic vibration sieve 1 is in operation. In other words, when the object to be processed supplied from the supply port 1b is subjected to a sieving process as usual by the wire mesh 1a2 which is ultrasonically vibrated by the ultrasonic vibrator 1a1, the ultrasonic vibration sieve 1 by the microphone 2a. Are collected.

  On the other hand, when the amount of the object to be processed supplied from the supply port 1b is reduced to about 20% in the normal operation of the ultrasonic vibrating screen 1 by the study by the present inventors, and from the supply port 1b. Even when the object to be processed is not supplied, the peak value of the resonance frequency of the ultrasonic vibration sieve 1 to which the normal wire mesh 1a1 is attached and the resonance frequency of the ultrasonic vibration sieve 1 to which the deteriorated wire mesh 1a1 is attached. It was confirmed that a difference from the peak value was generated, that is, it was possible to diagnose deterioration of the wire mesh 1a2.

  Therefore, in the ultrasonic vibration sieve screen deterioration diagnosis method of the sixth embodiment, the amount of the object to be processed supplied from the supply port 1b is reduced to about 20% during normal operation of the ultrasonic vibration sieve 1. Sometimes it is possible to diagnose the deterioration of the wire mesh 1a2. Alternatively, in the ultrasonic vibration sieving wire deterioration diagnosis method of the seventh embodiment, it is possible to diagnose the deterioration state of the wire mesh 1a2 when the workpiece is not supplied from the supply port 1b. Moreover, in the ultrasonic vibration sieve mesh deterioration diagnosis method of the eighth embodiment, the peak value of the resonance frequency of the ultrasonic vibration sieve 1 to which the normal metal mesh 1a1 is attached and the super value to which the deteriorated metal mesh 1a1 is attached. When an arbitrary amount capable of causing a difference from the peak value of the resonance frequency of the sonic vibrating screen 1 is supplied from the supply port 1b, that is, an arbitrary amount capable of diagnosing the deterioration of the metal mesh 1a2, the wire mesh 1a2 It is also possible to diagnose the deterioration state of.

  As described above, in the ultrasonic vibration sieving mesh deterioration diagnosis apparatus of the first to eighth embodiments, the deterioration state of the metal mesh 1 a 2 is diagnosed based on the resonance frequency of the ultrasonic vibration sieving 1. Specifically, the resonance frequency peak value P1 of the ultrasonic vibration sieve 1 to which the wire mesh 1a2 to be diagnosed is attached, and the resonance frequency peak value P0 of the ultrasonic vibration sieve 1 to which the normal wire mesh 1a2 is attached are The deterioration state of the wire mesh 1a2 to be diagnosed is diagnosed based on the difference ΔP (= P0−P1).

  Therefore, according to the ultrasonic vibration sieving mesh deterioration diagnosis method of the first to eighth embodiments, the deterioration of the wire mesh 1a2 is more than the case where the deterioration state of the wire mesh 1a2 is estimated based on the usage period of the wire mesh 1a2, for example. The condition can be accurately diagnosed. Specifically, according to the ultrasonic vibration sieving mesh deterioration diagnosis method of the first to eighth embodiments, the processing object subjected to sieving processing by the ultrasonic vibration sieving 1 by detecting deterioration of the metal mesh 1a2 at an early stage. The possibility that fragments of the wire mesh 1a2 may be mixed into an object can be reduced.

  Furthermore, in the ultrasonic vibration sieve mesh deterioration diagnosis method of the first to eighth embodiments, the ultrasonic vibrator 1a1 for generating ultrasonic vibration when the ultrasonic vibration sieve 1 is operated is used to deteriorate the metal mesh 1a2. The ultrasonic vibrating sieve 1 is resonated at the time of diagnosis. Specifically, when diagnosing deterioration of the wire mesh 1a2, the ultrasonic vibrator 1a1 resonates the ultrasonic vibrator 1a1, and the deterioration state of the wire mesh 1a2 is diagnosed based on the resonance frequency of the ultrasonic vibrator 1 at that time.

  Therefore, according to the ultrasonic vibration sieve wire mesh deterioration diagnosis method of the first to eighth embodiments, means for resonating the ultrasonic vibration sieve 1 at the time of deterioration diagnosis of the wire mesh 1a2 is provided separately from the ultrasonic vibrator 1a1. The necessity to provide can be eliminated.

  In the ultrasonic vibration sieve wire mesh deterioration diagnosis method according to the first and sixth to eighth embodiments, the microphone 2a for collecting the resonance frequency of the ultrasonic vibration sieve 1 at the time of deterioration diagnosis of the wire mesh 1a2 is provided on the wire mesh 1a2. It is arranged on the opposite side of the ultrasonic transducer 1a1 across the center C. Therefore, the deterioration state of the wire mesh 1a2 can be diagnosed more accurately than when the microphone 2a is disposed at another position.

  Furthermore, in the ultrasonic vibration sieve mesh deterioration diagnosis methods of the first to fifth embodiments, the deterioration state of the metal mesh 1a2 is diagnosed when the ultrasonic vibration sieve 1 is in operation. That is, the deterioration state of the wire mesh 1a2 is diagnosed when the object to be processed is sieved as usual by the wire mesh 1a2. Therefore, it is possible to eliminate the necessity of stopping the operation of the ultrasonic vibrating screen 1 in order to diagnose the deterioration state of the wire mesh 1a2.

It is the figure which showed the ultrasonic vibration sieving net deterioration diagnostic apparatus etc. to which the ultrasonic vibration sieving net deterioration diagnostic method of 1st Embodiment is applied. It is a schematic block diagram of the principal part 1a of the ultrasonic vibration sieve 1 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic vibration sieve 1a Main part 1a1 Ultrasonic vibrator 1a2 Wire mesh 1a3 Mesh frame 1a4 Resonant ring 1a5 Support plate 1b Supply port 1c Discharge port 1d Discharge port 2 Ultrasonic vibration sieve mesh degradation device 2a Microphone 2b FFT analysis device 2c Timer 2d computer

Claims (5)

  Ultrasonic vibrating screen mesh deterioration diagnosis method for diagnosing deterioration state of wire mesh of ultrasonic vibrating screen, diagnosis of deterioration state of wire mesh based on resonance frequency of ultrasonic vibrating screen Diagnosis method.   Based on the difference between the peak value of the resonance frequency of the ultrasonic vibrating screen to which the wire mesh to be diagnosed is attached and the peak value of the resonance frequency of the ultrasonic vibrating screen to which the normal wire mesh is attached, The ultrasonic vibration sieve mesh deterioration diagnosis method according to claim 1, wherein the deterioration state of the ultrasonic vibration is diagnosed.   The ultrasonic vibration sieve is caused to resonate at the time of ultrasonic vibration sieve wire mesh deterioration diagnosis using an ultrasonic vibrator for generating ultrasonic vibration during operation of the ultrasonic vibration sieve. Ultrasonic vibration sieve mesh deterioration diagnosis method.   The microphone for collecting the resonance frequency of the ultrasonic vibration sieve at the time of ultrasonic vibration sieve mesh deterioration diagnosis is disposed on the opposite side of the ultrasonic vibrator across the center of the metal mesh. Ultrasonic vibration sieve mesh deterioration diagnosis method.   The ultrasonic vibration sieve mesh deterioration diagnosis method according to any one of claims 1 to 4, wherein the deterioration state of the metal mesh is diagnosed during operation of the ultrasonic vibration sieve.

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