JP7263894B2 - sieving device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sieving device that sieves particulates by particle size by vibration.

Conventionally, as a device for sieving crushed wheat or the like, for example, a purifier described in Patent Document 1 is known.
This purifier has a sieve box with a plurality of sieve meshes with different meshes, and supports the four corners of the sieve box with supports via rubber springs. A supply gutter for supplying stock before sorting is connected to the sieve box, and a collecting device for collecting the fallen stock is installed below the sieve box.
When the vibrating motor is operated, the sieve box and the collection device reciprocate back and forth, and the stock supplied onto the sieve box through the supply gutter is shaken, thereby sorting the stock by particle size and collecting it. Collected by collection equipment.

JP-A-8-39002

A sieving device such as the purifier described in Patent Document 1 does not have a function of monitoring the vibration state during operation. Therefore, if the bearing inside the vibration motor is damaged, the vibration motor suddenly stops, and the danger cannot be sensed until such an accident occurs. In addition, if the mounting bolts of the vibration motor are loosened, the vibration is not properly transmitted to the sieve box and the sieving performance is degraded. Trouble may occur.
A problem to be solved by the present invention is to provide a sieving apparatus that constantly monitors the vibration state of the vibration motor itself and can quickly respond to an abnormality of the vibration motor.

The invention according to claim 1 of the present application comprises a mount, a vibrating section that reciprocally vibrates with respect to the mount in one direction in a plan view and has a sieve frame, and a rotor inside a casing that rotates the vibrating section. a vibrating motor for generating reciprocating vibration, the sieving device being provided in a casing of the vibrating motor and capable of detecting acceleration of the vibrating motor in the radial direction of rotation of the rotor. and a vibration monitoring device that measures the vibration state of the vibration electric motor based on the acceleration of the vibration electric motor detected by the acceleration detection unit and monitors the vibration unit and/or the vibration electric motor. A sieving device comprising:

The invention according to claim 2 of the present application is characterized in that the acceleration detection unit includes at least a first acceleration detection unit that detects acceleration in a direction parallel to one direction in which the vibration unit reciprocates in plan view. A sieving device according to claim 1.

The invention according to claim 3 of the present application is characterized in that the acceleration detection unit includes at least a second acceleration detection unit that detects acceleration in a direction orthogonal to one direction in which the vibration unit reciprocates in plan view. The sieving apparatus according to claim 1, wherein

In the invention according to claim 4 of the present application, the acceleration detection unit includes a first acceleration detection unit that detects acceleration in a direction parallel to one direction in which the vibration unit reciprocates in a plan view, and 2. The sieving apparatus according to claim 1, further comprising a second acceleration detection unit for detecting acceleration in a direction orthogonal to one direction of vibration in plan view.

In the invention according to claim 5 of the present application, vibration electric motors are provided on both sides of the vibrating section with respect to the central axis along the one direction, and the vibration electric motors are provided with a first acceleration detection section and a second acceleration detection section, respectively. The sieving apparatus according to claim 4, characterized in that:

The invention according to claim 6 of the present application is characterized in that, when the measured value deviates from a predetermined threshold value, the vibration monitoring device displays the cause of the abnormality and the coping method on the display device. 6. The sieving apparatus according to any one of 5.

According to the present invention, since the vibration state of the vibration motor can be constantly monitored, abnormalities in the bearings, mounting bolts, bearings, etc. of the vibration motor can be quickly detected and promptly dealt with. Also, it is possible to prevent deterioration of the durability of the vibration motor.

In addition, by including a first acceleration detection unit that detects acceleration in a direction parallel to one direction in which the vibration unit reciprocates in a plan view, it is possible to support not only the vibration motor but also the vibration state of the vibration unit and the vibration unit. Abnormality in reciprocating vibration due to failure of the part where the vibration is generated can be quickly detected.

In addition, by including a second acceleration detection unit that detects acceleration in a direction perpendicular to the one direction in which the vibrating unit reciprocates in a plan view, the effect of vibration in one direction, which is normal vibration of the vibrating unit, is included. Therefore, the vibration state in the direction orthogonal to this can be accurately measured without receiving the vibration, and the abnormality detection accuracy is improved.

In addition, by providing vibration motors on both sides of the central axis along one direction of the vibrating unit, and providing a first acceleration detection unit and a second acceleration detection unit on each of these vibration motors, two vibration units can be obtained. It is possible to quickly detect a malfunction of synchronization of the electric motors.

In addition, when the measured value deviates from a predetermined threshold value, the vibration monitoring device displays the cause of the abnormality and countermeasures on the display device. Able to react quickly and correctly.

1 is a side view of a sieving device showing an embodiment of the present invention; FIG. 1 is a rear view of a sieving device showing an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS The vibration electric motor which concerns on embodiment of this invention is shown, (a) is a rear view, (b) is a top view. 1 is a front view of a sieving device showing an embodiment of the present invention; FIG. 1 is a block diagram of an acceleration detector and a vibration monitoring device according to an embodiment of the invention; FIG. It is a signal processing block diagram of the sieving device showing the embodiment of the present invention. FIG. 4 is a diagram illustrating a correspondence relationship between a determination result of an acceleration signal and an abnormality cause in the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, it cannot be overemphasized that this invention is not limited to embodiment.
As shown in FIGS. 1 and 2, the sieving apparatus 1 of the present invention includes a pedestal 2, a vibrating section 4 that reciprocates in one direction with respect to the pedestal 2 in a plan view and has a sieve frame 3, and a casing 7. It has two vibrating electric motors M1 and M2 that generate reciprocating vibration of the vibrating section 4 by rotating the internal rotor.
In the following description, the direction parallel to the direction in which the vibration unit 4 reciprocates in plan view is the X direction (horizontal direction in FIG. 1 and the depth direction in FIG. 2), and the direction perpendicular to the X direction in plan view is Y. It is referred to as a direction (the depth direction of the paper surface in FIG. 1, the left-right direction of the paper surface of FIG. 2).

Supports 5 are provided at the four corners of the frame 2, and the vibrating section 4 is supported by rubber springs 6 attached to these supports 5. As shown in FIG.
The frame 2 is provided with a frame (not shown), and the frame is provided with a cover 30 . The base 2, frame, and cover 30 do not reciprocate.
Reference numeral 8 designates a supply cylinder for supplying the granules before sieving into the sieve frame 3 from above.

In the sieve frame 3 of the vibrating part 4, a plurality of sieve screens with different meshes are stacked so that the meshes become finer toward the bottom.
The vibrating section 4 is provided with a collection device 9 that collects the granular materials that have passed through the sieve screens of the sieve frame 3 by grade, and the granular materials collected by the collection device 9 are taken out of the apparatus. In addition, the granules remaining on the sieve frame 3 are discharged out of the machine through another path.
Since the above structure is well known in the prior art, detailed description thereof will be omitted.

The vibration motors M1 and M2 are provided on both sides of the vibrating section 4 with the center axis along the X direction interposed therebetween. The rotors and unbalanced weights inside the casings 7 of these two vibrating motors M1 and M2 rotate in opposite directions, and the unbalanced weights synchronously reciprocate the vibrating section 4 in the X direction. The rotors and unbalanced weights inside the casing 7 of these vibration motors M1 and M2 correspond to the rotor of the present invention. A plane including the rotation circle of the rotor is substantially parallel to the XY plane. The vibrating motors M1 and M2 also vibrate together with the vibrating section 4 .

As shown in FIG. 3, acceleration detectors 10 and 11 capable of detecting acceleration in the radial direction of rotation of the rotor are provided on the outer surface of the casing 7 of the vibration motors M1 and M2, respectively. Acceleration detection units 10 and 11 detect acceleration of the vibration motors M1 and M2.
The acceleration detection unit 10 of the vibration electric motor M1 includes a first acceleration detection unit A1 that detects acceleration in the X direction, and a second acceleration detection unit A2 that detects acceleration in the Y direction.
Further, the acceleration detection unit 11 of the vibration electric motor M2 includes a first acceleration detection unit A3 that detects acceleration in the X direction, and a second acceleration detection unit A4 that detects acceleration in the Y direction.

The first acceleration detectors A1 and A3 are sensors that detect uniaxial acceleration, and are installed to detect X-direction acceleration of the vibration motors M1 and M2, respectively, in the radial direction of rotation of the rotor. The second acceleration detectors A2 and A4 are sensors that detect uniaxial acceleration, and are installed to detect acceleration of the vibration motors M1 and M2 in the Y direction in the radial direction of rotation of the rotor.

As shown in FIG. 5, the first acceleration detection units A1, A3 and the second acceleration detection units A2, A4 are connected to the vibration monitoring device 13 (see FIG. 4) installed on the outer surface of the cover 30. As shown in FIG.
The vibration monitoring device 13 is provided with a signal processing unit 14, a display device 16, an alarm buzzer 17, and the like.
Also, the first acceleration detection units A1 and A3, the second acceleration detection units A2 and A4, the display device 16, and the alarm buzzer 17 are connected to the signal processing unit . Furthermore, the signal processing unit 14 is connected to the operation management system of the facility via general-purpose external communication means.

Next, referring to FIG. 6, signal processing of the sieving device 1 will be described.
By performing the operation start operation, the sieving device 1 is activated, the vibration motors M1 and M2 rotate, and the vibrating section 4 reciprocates in the X direction (the actual vibrating section 4 may vibrate parallel to the X direction). 1), the first acceleration detection section A1 and the second acceleration detection section A2 of the vibration electric motor M1, and the first acceleration detection section A3 of the vibration electric motor M2. And the second acceleration detection part A4 starts detection.
X-direction and Y-direction acceleration signals of the vibration motors M1 and M2 acquired by the first acceleration detection units A1 and A3 and the second acceleration detection units A2 and A4 are sent to the signal processing unit 14 through wireless or wired communication. Sent.

Based on the acceleration signals sent from the first acceleration detection units A1 and A3 and the second acceleration detection units A2 and A4, the signal processing unit 14 controls the vibration electric motor M1 in the X direction and the Y direction, and the vibration electric transmitter M2. Vibration frequency F is detected for each of the X and Y directions.
Then, the vibration frequency F is compared with thresholds Fmin to Fmax of the vibration frequency set in advance as a normal range to determine abnormality. When the detected vibration frequency F exceeds the thresholds Fmin to Fmax, the signal processing unit 14 performs warning processing.

Since it reciprocates in the X direction, it is expected that the vibration frequency in the Y direction is smaller than that in the X direction. Therefore, if Fmax is set small as the threshold for the Y direction, an abnormality can be detected quickly.
In this vibration frequency abnormality determination, it is possible to determine whether the vibrator is operating at a predetermined frequency or whether the vibrator is operating at a predetermined frequency.

In addition, the signals of the vibration frequency F, twice its frequency 2F, and three times its frequency 3F are subjected to a band-pass filter (BPF) to attenuate the bands other than the predetermined value, and the acceleration effective value is summed to obtain the value is compared with preset threshold values a1 and a2, and abnormality determination A is performed. In the example shown in FIG. 6, bands other than F±1 Hz, 2F±2 Hz, and 3F±3 Hz are attenuated, but this range can be changed arbitrarily.
As a result of the abnormality determination A, the signal processing unit 14 performs caution processing when the sum exceeds the threshold a1 and does not reach the threshold a2, and performs warning processing when the sum exceeds the threshold a2.

Furthermore, the signal processing unit 14 applies a band-stop filter (BSF) to the signals of the vibration frequency F, its double frequency 2F, and its triple frequency 3F to remove a predetermined band, and FFT-transforms the extracted signal. , the overall value for each of the low frequency band (1 Hz to 100 Hz), the middle frequency band (100 Hz to 1 kHz), and the high frequency band (1 kHz or higher). In the example shown in FIG. 6, the removal frequency bands are F±1 Hz, 2F±2 Hz, and 3F±3 Hz, but these ranges can be changed arbitrarily.

Next, the overall value of the low frequency band is compared with the set threshold values b1 and b2 to perform abnormality determination B. If the threshold value b1 is exceeded and the threshold value b2 is not reached, caution processing is performed, and if the threshold value b2 is exceeded. Perform warning processing.
Also, the overall value of the middle frequency band is compared with threshold values c1 and c2 to perform abnormality determination C. If the threshold value c1 is exceeded and the threshold value c2 is not reached, caution processing is performed, and if the threshold value c2 is exceeded, a warning processing is performed. .
The overall value of the high frequency band is compared with thresholds d1 and d2 to perform abnormality determination D. If threshold d1 is exceeded and threshold d2 is not reached, caution processing is performed, and if threshold d2 is exceeded, warning processing is performed.

The threshold value set for caution processing is a level that requires inspection within about one month. As a warning process of the signal processing unit 14, the operation of the sifting device 1 is continued, but the fact that there is an abnormality, the cause of the abnormality corresponding to the abnormality in the vibration state, and the method of coping with it are displayed on the display device 16, and external communication is performed. There is a process of sending the same content to the operation management system.

The threshold set for warning processing is higher than the threshold for caution processing, and is a level that requires immediate action. As a warning process of the signal processing unit 14, the operation of the sieving device 1 is immediately stopped, and the alarm buzzer 17 is activated to inform the operator or supervisor of the occurrence of abnormality, and to notify that there is an abnormality and that the vibration state is abnormal. The cause of the abnormality and the coping method corresponding to .

Abnormalities in the vibration state, causes of the abnormalities corresponding thereto, and countermeasures against the abnormalities are as shown in FIG.
As an example, in the abnormality determination A, the vibration frequency based on the acceleration signal in the X direction obtained by the first acceleration detection units A1 and A3 is good (GO), and the acceleration in the Y direction obtained by the second acceleration detection units A2 and A4 If the vibration frequency based on the signal is abnormal (NG) and if the vibration state in both directions is abnormal, the display device 16 will display "unbalance between upper and lower weights of the vibration motor" and "vibration of two motors" as the cause of the abnormality. "Displacement of numbers", "Rubber spring settling", etc. are displayed, and countermeasures such as "Inspection of vibration frequency of vibration motor", "Inspection of rubber spring", etc. are displayed.

On the other hand, in the abnormality determination A, the vibration state in the X direction detected by the first acceleration detection units A1 and A3 is abnormal (NG), and the vibration state in the Y direction detected by the second acceleration detection units A2 and A4 is good (GO ), the display device 16 displays "rubber spring fatigue" as the cause of the abnormality and "inspection of the rubber spring" as the countermeasure.

In addition, in the abnormality determination D of the high frequency band, the overall value based on the acceleration signal in the X direction obtained by the first acceleration detection units A1 and A3, and the acceleration in the Y direction obtained by the second acceleration detection units A2 and A4 If at least one of the overall values based on the signal is abnormal (NG), the display device 16 displays "bearing wear" as the cause of the abnormality, and displays "check the bearing, add grease" as the countermeasure. .

In FIG. 7, the correspondence relationship between the abnormality in the vibration state and the cause of the abnormality is merely an example. Depending on the use and installation environment of the sieving device, the determination method and response method will differ, so it will be determined as appropriate.

[Other Modifications]
The present invention is not limited to the above embodiments. Examples include:

In the embodiment, first acceleration detection units A1 and A3 for detecting acceleration in the X direction in which the vibrating unit 4 reciprocates, and second acceleration detection units A2 and A4 for detecting acceleration in the Y direction orthogonal to the X direction are provided. However, since the X direction is important for determining whether or not the vibration motors M1 and M2 are vibrating at the appropriate vibration frequency, the second acceleration detectors A2 and A4 can be omitted.

Since the bearings of the two vibration motors M1 and M2 have substantially the same tendency of deterioration, if it is only necessary to monitor the deterioration of the bearings, an acceleration detector may be provided at an intermediate position between the two vibration motors M1 and M2. It is also possible to provide an acceleration detection section only in the vibration motor of , and perform maintenance on two bearings at the same time. In order to monitor abnormalities in individual vibration motors, it is necessary to provide an acceleration detector for each of the two vibration motors M1 and M2.

In the embodiments, the acceleration detection unit uses a sensor that detects acceleration in one axial direction, but the present invention is not limited to this. A sensor capable of detecting acceleration in two axial directions may be used. In this case, the X and Y axes are measured. By using such a sensor, it is possible to save the trouble of installing two detection units in the vibration motor.

In the embodiment, the vibration frequency is measured and determined, but the vibration frequency may be measured and displayed on the display device. By doing so, it becomes easy to know whether or not the vibrating section and the vibrating motor are operating at the set vibration frequency.

In the embodiment, the vibrating section and the vibrating motor are monitored, but either one may be monitored.

REFERENCE SIGNS LIST 1 sieving device 2 frame 3 sieve frame 4 vibration part 5 post 6 rubber spring M1, M2 vibration motor 7 casing 8 supply tube 9 collection device 10, 11 acceleration detection part A1, A3 first acceleration detection part A2, A4 second Acceleration detector 13 Vibration monitor 14 Signal processor 16 Display device 17 Alarm buzzer 30 Cover

Claims (6)

a pedestal, a vibrating portion that reciprocates in one direction in plan view with respect to the pedestal and has a sieve frame, and a vibrating electric motor that rotates a rotor inside a casing to generate the reciprocating vibration of the vibrating portion; A sieving device comprising:
The sieving device is
an acceleration detection unit provided in a casing of the vibration motor and capable of detecting acceleration of the vibration motor in a radial direction of rotation of the rotor;
a vibration monitoring device that measures the vibration state of the vibration motor based on the acceleration of the vibration motor detected by the acceleration detection unit and monitors the vibration unit and/or the vibration motor;
A sieving device comprising: In the acceleration detection unit,
At least a first acceleration detection unit that detects acceleration in a direction parallel to one direction in which the vibration unit reciprocates in a plan view,
The sieving device according to claim 1, characterized in that: In the acceleration detection unit,
At least a second acceleration detection unit that detects acceleration in a direction orthogonal to one direction in which the vibration unit reciprocates in a plan view,
The sieving device according to claim 1, characterized in that: In the acceleration detection unit,
a first acceleration detection unit that detects acceleration in a direction parallel to one direction in which the vibration unit reciprocates, in a plan view;
A second acceleration detection unit that detects acceleration in a direction orthogonal to one direction in which the vibration unit reciprocates in a plan view,
The sieving device according to claim 1, characterized in that: 4. Vibrating motors are provided on both sides of said vibrating unit with respect to said central axis along said one direction, and said oscillating motors are respectively provided with a first acceleration detector and a second acceleration detector. A sieving device as described in . 6. The vibration monitoring device according to any one of claims 1 to 5, wherein when the measured value deviates from a predetermined threshold value, the vibration monitoring device displays the cause of the abnormality and a countermeasure against the abnormality on the display device. sieving device.

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