JP2021096106A - Pan coating device, failure detection system of pan coating device and failure detection method of pan coating device - Google Patents

Abstract

To detect a sign of failure of a front bracket roll in advance, prevent large damage of a pan coating device, prevent shutdown due to the failure of the device, and shorten a shutdown period.SOLUTION: A pan coating device 1 has a rotatable pan 3 in which an object to be treated is housed, and a front bracket roll 11 that rotatably supports the pan 3. The front bracket roll 11 is rotatably supported by a roll support shaft 13. A vibration sensor 21 for detecting the vibration of the roll support shaft 13 is attached to the roll support shaft 13. The vibration sensor 21 calculates a vibration acceleration of the roll support shaft 13 from detection data of the vibration sensor 21, compares the vibration acceleration with a predetermined threshold, and determines whether or not there is an abnormality in the front bracket roll 11 based on the comparison result.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pan coating device for coating a pharmaceutical preparation such as a tablet, food, seeds, metal parts, etc., and a failure detection technique thereof.

As a device for coating pharmaceuticals and foods, a pan coating device (pan coater) equipped with a coating pan having a polygonal cross section or a circular cross section (also referred to as a rotating drum, hereinafter abbreviated as pan) has been conventionally known. ing. In such a pan coating device, in order to prevent defective products from occurring or operation stop due to device failure, a method of detecting device failure in advance by detecting abnormal vibration of the drive system or rotating system is known. ..

In that case, abnormal vibration of each part is performed by attaching a vibration sensor to a motor, a bearing, or the like, but the motor or the bearing is a rotating member, and if the sensor is directly attached to the shaft, the lead wire of the sensor is twisted. For this reason, in the drive system and the rotating system, the sensor is conventionally arranged in the direction perpendicular to the rotating shaft, or installed in an indirect part (shaft support, base member, etc.) without directly touching the rotating shaft. A failure of the motor etc. is detected. At that time, since the motor or bearing usually rotates at high speed, vibration abnormality is likely to become apparent, and by attaching a sensor around the motor or bearing, it is relatively easy to detect a device failure or deterioration of parts. Can be done.

On the other hand, in the pan coating device, the pan is rotated by a motor, a speed reducer, a chain, a sprocket, or the like, but since the pan is heavy, a front receiving roll is provided as an auxiliary function to support the front side of the pan. The front receiving roll is provided close to the front opening of the pan, holds the circumference of the pan opening, and rotates in synchronization with the rotation of the pan. As described above, the front receiving roll is also a rotating member, and bearings are arranged inside the rotating member, and like the motor and the like, regular maintenance including the bearings is required.

Further, since the front receiving roll is installed near the entrance / exit of the object to be treated, heat is applied during the coating treatment, and washing water is applied after the treatment. Therefore, the front receiving roll is required to have heat resistance and water resistance, and in the case of pharmaceutical preparations, dust resistance is also required. As a result, in the pan coating apparatus, the front receiving roll, which has a harsh cleaning environment and temperature environment, is consumed most quickly, and from the viewpoint of failure detection, it is important to know when to replace the front receiving roll.

Japanese Unexamined Patent Publication No. 6-300618 Japanese Unexamined Patent Publication No. 2019-15695

However, since the front receiving roll rotates by itself, the vibration sensor cannot be directly attached to the roll for failure detection. In addition, since the pan operates at a low rotation speed (about 12 rpm) and the front receiving roll operates only at a relatively low rotation speed (about 60 rpm), vibration abnormalities are unlikely to become apparent, and the base part of the front receiving roll and the like around the roll. Even if a vibration sensor is attached to the member, the micro-vibration range cannot be measured reliably, and a failure cannot be detected well. Further, in the roll rotating at a low speed, it is difficult for the abnormality to become apparent even if the vibration speed is measured, and it is very difficult to detect the abnormality of the front receiving roll by the vibration sensor. If the front roll is damaged, the rotation of the pan becomes uneven, which not only affects the product quality but also may cause great damage to the device itself.

Further, although the front receiving roll is a consumable replacement part, it is often made to order, and there is a possibility that it cannot be replaced immediately when damage to the front receiving roll is found due to abnormal noise or the like. In that case, the equipment cannot be operated during the procurement period of the advance roll, and the operation is forced to be stopped due to the equipment failure. If the lead time is long, the operation suspension period becomes long due to the damage of the advance roll. There was also the problem.

An object of the present invention is to detect a precursor of a failure of the front roll in advance and prevent a large damage to the pan coating device, thereby preventing an operation stop due to a device failure and shortening an operation stop period. It is in.

The pan coating apparatus of the present invention includes a rotatable pan that houses an object to be processed, a roll member that rotatably supports the pan, a roll shaft that rotatably supports the roll member, and the roll shaft. It is characterized by having a vibration sensor which is attached and detects the vibration of the roll shaft.

In the present invention, a vibration sensor is arranged on the roll shaft of the roll member that supports the pan of the pan coating device, and the vibration of the roll shaft is detected. Then, from the vibration of the roll shaft, a precursor that occurs in the roll member before the failure is detected in advance. For example, when the vibration acceleration exceeds a predetermined threshold value, or when the behavior that crosses the threshold value frequently occurs, an alarm for occurrence of an abnormality is issued on a display device such as a touch panel. As a result, it is possible to notify the device user and the manufacturer / distributor of the roll member when to replace the roll member, and by performing maintenance accordingly, it is possible to prevent major damage to the device and shorten the operation suspension period due to the device failure. It becomes possible.

In the pan coating device, a plurality of the roll members are arranged on one end side of the pan and support the periphery of the front opening of the pan, and the plurality of rolls are supported by the separate roll shafts. , The vibration sensor may be attached to at least one roll shaft.

The failure detection system of the pan coating device of the present invention is a failure detection system of a pan coating device including a rotatable pan for accommodating an object to be processed, and includes a roll member that rotatably supports the pan and the above. It has a roll shaft that rotatably supports a roll member, a vibration sensor attached to the roll shaft and detects vibration of the roll shaft, and a failure detection device connected to the vibration sensor. The device includes a vibration acceleration detection unit that calculates vibration acceleration from the detection data of the vibration sensor, a threshold comparison unit that compares the vibration acceleration calculated by the vibration acceleration detection unit with a predetermined threshold, and a comparison between the threshold comparison units. It is characterized by having an abnormality determination unit for determining the presence or absence of an abnormality in the roll member based on the result.

In the present invention, a vibration sensor is arranged on the roll shaft of the roll member that supports the pan of the pan coating device, and the vibration acceleration is calculated from the detection data of the vibration sensor by the vibration acceleration detection unit. Then, the vibration acceleration calculated by the threshold value comparison unit is compared with a predetermined threshold value, and the abnormality determination unit determines whether or not there is an abnormality in the roll member based on the comparison result. For example, when the vibration acceleration exceeds a predetermined threshold value, or when the behavior that crosses the threshold value frequently occurs, an alarm for occurrence of an abnormality is issued on a display device such as a touch panel. As a result, it is possible to detect in advance the precursors that occur in the roll member before the failure and notify the device user and the manufacturer / distributor of the roll member when to replace the roll member. It is possible to prevent large damage and shorten the operation suspension period due to equipment failure.

In the failure detection system of the pan coating device, a display means connected to the failure detection device and displaying the determination result in the abnormality determination unit may be further provided. In this case, the display means may be arranged at a remote location away from the pan coating device.

The failure detection method of the pan coating device of the present invention is a failure detection method of a pan coating device provided with a rotatable pan for accommodating an object to be processed, and the pan coating device rotatably supports the pan. A roll member, a roll shaft that rotatably supports the roll member, and a vibration sensor attached to the roll shaft to detect the vibration of the roll shaft, based on the detection data of the vibration sensor. It is characterized in that an abnormality of the roll member is detected.

In the present invention, a vibration sensor is arranged on the roll shaft of the roll member that supports the pan of the pan coating device, and the vibration acceleration is calculated from the detection data of the vibration sensor. Then, the calculated vibration acceleration is compared with a predetermined threshold value, and an abnormality of the roll member is detected based on the comparison result. For example, when the vibration acceleration exceeds a predetermined threshold value, or when the behavior that crosses the threshold value frequently occurs, an alarm for occurrence of an abnormality is issued on a display device such as a touch panel. As a result, it is possible to detect in advance the precursors that occur in the roll member before the failure and notify the device user and the manufacturer / distributor of the roll member when to replace the roll member. It is possible to prevent damage and shorten the operation suspension period due to equipment failure.

In the failure detection method of the pan coating device, the vibration acceleration is calculated from the detection data of the vibration sensor, the vibration acceleration is compared with a predetermined threshold value, and the presence or absence of abnormality of the roll member is determined based on the comparison result. You may do so.

According to the pan coating apparatus of the present invention, a vibration sensor is arranged on the roll shaft of the roll member that supports the pan of the pan coating apparatus to detect the vibration of the roll shaft. It is possible to detect in advance the precursors that occur in the roll member. As a result, it is possible to notify the device user and the manufacturer / distributor of the roll member when to replace the roll member, and by performing maintenance accordingly, it is possible to prevent major damage to the device and shorten the operation suspension period due to the device failure. It becomes possible.

According to the failure detection system of the pan coating device of the present invention, a vibration sensor is arranged on the roll shaft of the roll member supporting the pan of the pan coating device, and the vibration acceleration detection unit calculates the vibration acceleration from the detection data of the vibration sensor. Since a failure detection device having a threshold comparison unit for comparing the vibration acceleration and a predetermined threshold and an abnormality determination unit for determining the presence or absence of an abnormality in the roll member based on the comparison result in the threshold comparison unit is provided, the roll shaft is provided. It is possible to detect in advance the precursors that occur in the roll member before the failure from the vibration of the roll member. As a result, it is possible to notify the device user and the manufacturer / distributor of the roll member when to replace the roll member, and by performing maintenance accordingly, it is possible to prevent major damage to the device and shorten the operation suspension period due to the device failure. It becomes possible.

According to the failure detection method of the pan coating device of the present invention, a vibration sensor is arranged on the roll shaft of the roll member supporting the pan of the pan coating device, the vibration acceleration is calculated from the detection data of the vibration sensor, and the calculated vibration acceleration is calculated. And a predetermined threshold are compared, and an abnormality of the roll member is detected based on the comparison result. Therefore, it is possible to detect in advance a sign that occurs in the roll member before the failure from the vibration of the roll shaft. .. As a result, it is possible to notify the device user and the manufacturer / distributor of the roll member when to replace the roll member, and by performing maintenance accordingly, it is possible to prevent major damage to the device and shorten the operation suspension period due to the device failure. It becomes possible.

It is explanatory drawing which shows the structure of the pan coating apparatus which is one Embodiment of this invention, and shows the structure which saw the pan coating apparatus from the side surface side. It is explanatory drawing which shows the structure of the pan-coating apparatus which is one Embodiment of this invention, and shows the structure which viewed the pan-coating apparatus from the front (front) side. It is explanatory drawing which shows the structure in the vicinity of the front receiving roll. It is explanatory drawing which shows the structure of the failure detection system. It is explanatory drawing which shows (a) the vibration speed at the time of normal, and (b) the vibration speed at the time of abnormality of the front receiving roll. It is explanatory drawing which shows (a) the vibration acceleration at the time of normal, and (b) the vibration acceleration at the time of abnormality of the front receiving roll.

Hereinafter, embodiments of the present invention will be described. 1 and 2 are explanatory views showing the configuration of the pan coating device 1 according to the embodiment of the present invention, FIG. 1 is a configuration in which the pan coating device 1 is viewed from the side surface side, and FIG. 2 is a configuration viewed from the front side. The configurations are shown respectively. The coating device 1 of FIGS. 1 and 2 has a configuration in which a coating pan 3 (hereinafter, abbreviated as pan 3) is rotatably installed in the central portion of the housing 2. The pan 3 rotates about a substantially horizontal rotation axis O, and an object to be processed such as tablets and confectionery is put in and stored inside the pan 3. A coating liquid is sprayed onto the object to be treated in the pan 3 by a spray gun (not shown), and the object to be treated is coated.

On the right side of FIG. 1 of the pan 3, a pan rotation mechanism 5 using a motor 4 is arranged. In FIG. 1 of the pan 3, the rotating shaft 6 is fixed to the right end side, and the sprocket 7 is attached to the rotating shaft 6. The sprocket 7 is connected to the sprocket 9 on the motor 4 side installed in the housing 2 via a chain 8. When the motor 4 is rotated (for example, about 1800 rpm), the pan 3 is chain-driven along with the rotation and rotates about the rotation axis O (for example, about 12 rpm).

On the other hand, in FIG. 1 of the pan 3, the left end side is supported by a front receiving roll (roll member) 11 made of synthetic resin. As shown in FIG. 2, two front receiving rolls 11 are provided on the front side of the apparatus, and the front opening 12 of the pan 3 is supported from below. FIG. 3 is an explanatory diagram showing a configuration in the vicinity of the front receiving roll 11. As shown in FIG. 3, the front receiving roll 11 is rotatably supported by the roll support shaft 13, and a bearing 14 is interposed between the front receiving roll 11 and the roll support shaft 13. The front receiving roll 11 is in contact with the ring-shaped mouthpiece 15 provided on the outer periphery of the front opening 12, and rotates together with the pan 3. The roll support shaft 13 is attached to the bracket 16 in a non-rotating state, does not rotate together with the front receiving roll 11, and rotatably supports the front receiving roll 11 via a bearing 14. The bracket 16 is fixed to the housing 2.

Here, in the pan coating device 1 according to the present invention, the vibration sensor 21 is attached to the roll support shaft 13 of the front receiving roll 11. As shown in FIG. 3, the vibration sensor 21 is attached to the end of the roll support shaft 13 and detects the vibration of the roll support shaft 13. A female screw portion (not shown) is formed on the end surface of the roll support shaft 13, and the vibration sensor 21 is fixed to the roll support shaft 13 by screwing the male screw portion provided in the vibration sensor 21 into the female screw. Be integrated.

As described above, since the front receiving roll 11 itself rotates, the sensor cannot be directly attached to the sensor, and the sensor also has various attachment restrictions such as waterproof, heat resistant, and explosion proof. Further, since the pan 3 has a low rotation and the front receiving roll 11 also has a low rotation of 100 rpm or less, even if a vibration sensor is attached to the bracket 16, the minute vibration of the front receiving roll 11 cannot be accurately detected.

Therefore, in the pan coating device 1, attention is paid to the fact that the roll support shaft 13 does not rotate by itself unlike a general rotating machine, and the vibration sensor 21 is attached to the roll support shaft 13. Since the roll support shaft 13 does not rotate, the vibration sensor 21 can be mounted horizontally with respect to the roll support shaft 13 without twisting the lead wire. Further, unlike the detection by the bracket 16, the sensor detection by the roll support shaft 13 can measure the vibration of the front receiving roll 11 at the nearest portion having the highest sensitivity. Therefore, by detecting the vibration of the roll support shaft 13 with the vibration sensor 21, it is possible to accurately capture the vibration change even in a low rotation member such as the front receiving roll 11.

FIG. 4 is a block diagram showing a configuration of a failure detection system in the pan coating device 1. As shown in FIG. 4, the detection data of the vibration sensor 21 is sent to the vibration indicator 22. Further, it is sent from the vibration indicator 22 to the digital recorder 23 to be recorded and displayed. Further, the detection data of the vibration sensor 21 is also sent to the PLC (Programmable Logic Controller) 24 which is a failure detection device, and the data is displayed on the touch panel (display means) 25. The vibration sensor 21 and the vibration indicator 22, the vibration indicator 22 and the digital recorder 23, the vibration sensor 21 and the PLC 24, and the PLC 24 and the touch panel 25 are wiredly connected by signal lines 26 to 29, respectively. It should be noted that the signal lines 26 to 29 may not be used, and the above-mentioned parts may be connected wirelessly.

The PLC 24 is provided with a CPU 31, a ROM 32, a RAM 33, a timer 34, a vibration speed detection unit 35, a vibration acceleration detection unit 36, a threshold value comparison unit 37, and an abnormality determination unit 38. In the PLC 24, the vibration velocity is calculated by the vibration velocity detection unit 35 and the vibration acceleration is calculated by the vibration acceleration detection unit 36 from the detection data of the vibration sensor 21. The calculated vibration velocity and vibration acceleration are stored in the RAM 33 and compared with a predetermined threshold value stored in the ROM 32 by the threshold value comparison unit 37.

Here, before the front receiving roll 11 breaks down due to aged deterioration or the like, abnormal vibration or abnormal noise occurs as a precursory phenomenon thereof. Therefore, in the pan coating device 1, the vibration velocity and the vibration acceleration of the roll support shaft 13 are detected by using the vibration sensor 21, displayed on the digital recorder 23 and the touch panel 25, and compared with a predetermined threshold value by the PLC 24. However, when the vibration speed or vibration acceleration exceeds the threshold value, or when the threshold value is frequently exceeded (for example, 5 times or more in 5 minutes), the abnormality determination unit 38 determines that an abnormality has occurred, and the touch panel 25 alerts the user. And alarms (displays and sounds).

In this case, the touch panel 25 may be in the vicinity of the pan coating device 1 or may be located away from the pan coating device 1. As a place away from the pan coating device 1, a separate room in the same site such as a building or a factory where the device is installed, or a remote place different from the place where the device is installed (for example, manufacturing of the front receiving roll 11). Supply company 39, etc.). The determination result by the abnormality determination unit 38 is sent to a display means such as a touch panel 25, a personal computer, or a smartphone by wire or wirelessly, and "abnormality occurrence" is notified there. At that time, by notifying the manufacturing and supplying company 39 of the occurrence of the abnormality via the Internet line or the like, the manufacturing and supplying company 39 can prepare a replacement pre-received roll.

FIG. 5 is an explanatory diagram showing (a) the normal vibration speed of the front receiving roll 11 and (b) the vibration speed at the time of abnormality, and FIG. 6 shows the (a) normal vibration acceleration of the front receiving roll 11. , (B) is an explanatory diagram showing the vibration acceleration at the time of abnormality. The data at the time of abnormality is the data when the oil lubrication inside the bearing 14 of the front receiving roll 11 is removed and the bearing is in an abnormal state. As shown in FIGS. 5 and 6, the waveforms of both the vibration velocity and the vibration acceleration are disturbed at the time of abnormality. In particular, the vibration acceleration is severely disturbed and tends to increase with the passage of time. At the time of abnormality, abnormal noise was also generated in synchronization with the disturbance of speed and acceleration.

Therefore, in the present invention, the abnormality of the pre-received roll 11 is detected in advance at the stage of the precursory phenomenon by setting a threshold value for the speed, the fluctuation width of the acceleration, and the acceleration value. As the threshold value, in FIGS. 5 and 6, for example, a. A speed of 0.3 mm / s or more is 5 times or more per minute, b. Acceleration of 0.3 mm / s ² or more is 5 times or more in 5 minutes, c. An average acceleration of 0.5 mm / s ² or more for 5 minutes can be set. In this case, the conditions can be appropriately selected or combined, and the threshold value comparison unit 37 determines, for example, "abnormal" if any one of a to c is satisfied, but if a and b are satisfied, it is abnormal. Various threshold values can be set according to the size of the roll, the number of rotations, and the like, such as an abnormality if and c are satisfied. Further, the vibration velocity detection unit 35 and the vibration acceleration detection unit 36 perform a Fourier transform on the vibration velocity and the vibration acceleration, and the FFT (Fast Fourier Transform) analysis result is set to a predetermined threshold by the threshold comparison unit 37. You may try to compare.

As described above, in the pan coating device 1, the failure of the front receiving roll 11 can be detected in advance by detecting the vibration of the roll support shaft 13. Therefore, the device user can grasp the replacement time of the front receiving roll 11 at an early stage, and can arrange and replace the front receiving roll 11 on a schedule that does not interfere with the production. Therefore, by performing maintenance according to the schedule, it is possible to prevent large damage to the device, prevent operation stoppage due to device failure, and shorten the operation stoppage period. In addition, the roll manufacturer / supplier can also make predictive maintenance efforts such as predicting the replacement time of parts and taking appropriate measures before a failure occurs while constantly grasping the operating status of the equipment. As a result, it is possible to give customers a sense of security and trust, and to develop and strengthen better after-sales service.

Further, the failure detection system according to the present invention can be applied to an existing pan coating device, and it is possible to perform failure diagnosis / detection of the device simply by attaching a vibration sensor to the roll support shaft of the existing device. Become. As described above, the failure detection system can be retrofitted to the conventional device without major changes or modifications, and is a system excellent not only in preventing failures but also in versatility.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof.
For example, in the above-described embodiment, the precursor of roll replacement is grasped by detecting the vibration of the roll support shaft 13, but the vibration sensor is arranged in the pan rotation mechanism 5 such as the motor 4 and the rotation shaft 6, and the vibration sensor is arranged by FFT analysis or the like. It is also possible to catch the precursor of equipment failure. Further, the vibration measurement of the roll support shaft 13 and the pan rotation mechanism 5 can be performed at all times, but may be performed periodically, for example, once a day at a fixed time.

Further, in the above-described embodiment, in the PLC 24, the vibration velocity and the vibration acceleration are calculated from the vibration data of the vibration sensor 21 and compared with the threshold values, respectively. However, according to the experiment of the inventor, the vibration acceleration is more favorable. Since the failure is markedly represented, only the vibration acceleration may be used for the failure detection. The above-mentioned threshold value is merely an example, and can be appropriately changed and set according to the specifications of the pan coating apparatus.

1 Pan coating device 2 Housing 3 Coating pan 4 Motor 5 Pan rotation mechanism 6 Rotating shaft 7 Sprocket 8 Chain 9 Sprocket 11 Front receiving roll (roll member)
12 Front opening 13 Roll support shaft 14 Bearing 15 Mouth bracket 16 Bracket 21 Vibration sensor 22 Vibration indicator 23 Digital recorder 24 PLC (Failure detection device)
25 Touch panel (display means)
26 Signal line 27 Signal line 28 Signal line 29 Signal line 31 CPU
32 ROM
33 RAM
34 Timer 35 Vibration speed detection unit 36 Vibration acceleration detection unit 37 Threshold comparison unit 38 Abnormality determination unit 39 Manufacturing and supply company O Rotation axis

Claims (7)

A rotatable pan that houses the object to be processed and
A roll member that rotatably supports the pan and
A roll shaft that rotatably supports the roll member,
A pan coating device that is attached to the roll shaft and has a vibration sensor that detects the vibration of the roll shaft. In the pan coating apparatus according to claim 1,
A plurality of the roll members are arranged on one end side of the pan and support the periphery of the front opening of the pan.
The plurality of rolls are supported by the roll shafts that are separate from each other.
The pan coating device, wherein the vibration sensor is attached to at least one roll shaft. A failure detection system for a pan coating device equipped with a rotatable pan that houses an object to be processed.
A roll member that rotatably supports the pan and
A roll shaft that rotatably supports the roll member,
A vibration sensor attached to the roll shaft and detecting the vibration of the roll shaft,
It has a failure detection device connected to the vibration sensor, and has
The failure detection device is
A vibration acceleration detection unit that calculates vibration acceleration from the detection data of the vibration sensor,
A threshold value comparison unit that compares the vibration acceleration calculated by the vibration acceleration detection unit with a predetermined threshold value.
A failure detection system for a pan coating device, comprising: an abnormality determination unit that determines the presence or absence of an abnormality in the roll member based on a comparison result in the threshold value comparison unit. In the failure detection system of the pan coating device according to claim 3,
A failure detection system for a pan coating device, which is connected to the failure detection device and further includes a display means for displaying a determination result in the abnormality determination unit. In the failure detection system of the pan coating device according to claim 4.
The display means is a failure detection system for a pan coating device, characterized in that the display means is arranged at a remote location away from the pan coating device. A failure detection method for a pan coating device equipped with a rotatable pan that houses an object to be processed.
The pan coating device is
A roll member that rotatably supports the pan and
A roll shaft that rotatably supports the roll member,
It has a vibration sensor that is attached to the roll shaft and detects the vibration of the roll shaft.
A method for detecting a failure of a pan coating device, which detects an abnormality of the roll member based on the detection data of the vibration sensor. In the method for detecting a failure of a pan coating device according to claim 6,
Failure of the pan coating device, characterized in that the vibration acceleration is calculated from the detection data of the vibration sensor, the vibration acceleration is compared with a predetermined threshold value, and the presence or absence of abnormality of the roll member is determined based on the comparison result. Detection method.

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