State monitoring system for rotating device

Abstract

To provide a state monitoring system of a rotary apparatus capable of performing accurate repair and maintenance by clarifying the cause of abnormality.SOLUTION: The state monitoring system 10 of the present invention is a system for monitoring the state of a rotating device 20 for a coating facility. The state monitoring system 10 includes state detection means SE1 to SE4, state determination means 52, and notification means 55. The state detection means SE1 to SE4 are provided on the bearings of the rotating shafts of the rotating bodies constituting the rotating device 20, and detect the states of the bearings. The state determination unit 52 determines whether or not the states of the bearings detected by the state detection units SE1 to SE4 are abnormal states based on a preset determination table. The notification means 55 notifies the content of the abnormal state and the coping method to the abnormal state when the determination result by the state determination means 52 is affirmative.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a condition monitoring system for monitoring the condition of rotating equipment for a painting facility. [Background technology]

[0002] Conventionally, systems have been proposed for monitoring the condition of rotating equipment such as fans (see, for example, Patent Document 1). The rotating shafts of the motor and impeller that make up such fans are provided with multiple bearings. However, if an abnormality occurs in these bearings, problems such as the fan stopping can occur. Bearings can be used for long periods of time before fatigue failure occurs, provided they are used under appropriate conditions. However, because the lifespan of a bearing varies depending on the conditions and environment of use, the lifespan of each bearing may differ even when multiple bearings are used in the same rotating equipment.

[0003] Bearing failures occur due to stressful conditions such as imbalance of the rotating body, inappropriate grease, misalignment of the rotating shaft, and improper installation of the bearing. In particular, improper lubrication due to deterioration of grease accounts for the majority of bearing failures. Therefore, various methods for detecting bearing conditions (failures) have been proposed. For example, a vibration sensor is used to measure bearing vibrations, and an alarm is issued when the measured bearing vibrations exceed an allowable value. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-187226 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when detecting the condition of bearings using the above methods, it is possible to determine that the measurement value is abnormal, but the cause of the abnormality remains unclear. Therefore, users need a high level of specialized knowledge to deal with the abnormality. Furthermore, in the past, regular maintenance was performed regardless of whether there was a malfunction. However, there was a tendency for excessive repairs to be performed during maintenance, which resulted in high maintenance costs.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a condition monitoring system for rotating equipment that enables accurate repair and maintenance by clarifying the cause of an abnormality. [Means for solving the problem]

[0007] In order to solve the above problem, the invention described in claim 1 is a system for monitoring the condition of rotating equipment for painting equipment, comprising: a condition detection means provided to a bearing of a rotating shaft of a rotating body constituting the rotating equipment and detecting the condition of the bearing; a condition determination means for determining whether the condition of the bearing detected by the condition detection means is an abnormal condition based on a preset determination table; and a notification means for notifying the content of the abnormal condition and how to deal with the abnormal condition when the determination result by the condition determination means is positive.

[0008] In the invention described in claim 1, when the condition determination means determines that the condition of the bearing detected by the condition detection means is abnormal based on a preset determination table, the notification means notifies the user of the nature of the abnormal condition and how to deal with the abnormal condition. This allows the user to carry out appropriate repairs and maintenance based on the notified countermeasures, even without knowledge of how to analyze abnormal conditions. Furthermore, rather than performing periodic maintenance, the user only needs to perform maintenance when the bearing becomes abnormal and a countermeasure is notified. This eliminates the need for excessive repairs during maintenance work, thereby reducing maintenance costs.

[0009] Examples of the notification means include a display means such as a liquid crystal display device that notifies the user of the content of the abnormal condition and how to deal with the abnormal condition using images that display letters, symbols, pictures, etc., and an audio output means such as a speaker that notifies the user of the content of the abnormal condition and how to deal with the abnormal condition using audio.

[0010] The invention described in claim 2 is characterized in that in claim 1, the notification means notifies the method for investigating the abnormal state.

[0011] According to the invention as set forth in claim 2, the user can quickly confirm an abnormal state by conducting an investigation based on the notified investigation method.

[0012] The invention described in claim 3 is characterized in that, in claim 1, when the state determination means determines that the state of the bearing has exceeded a first threshold value that is close to the abnormal state, the notification means issues a first notification to notify that the state of the bearing is close to the abnormal state, and when the state determination means determines that the state of the bearing has exceeded a second threshold value that becomes the abnormal state, the notification means issues a second notification to notify that the state of the bearing is the abnormal state, and the first notification and the second notification have different notification modes.

[0013] In the invention described in claim 3, when the bearing condition exceeds a first threshold, a first notification is made to notify that the bearing condition is close to an abnormal state, and when the bearing condition exceeds a second threshold, a second notification is made to notify that the bearing condition is in an abnormal state. In this way, the bearing condition is notified in stages, allowing preparations to be made in advance to deal with the abnormal state.

[0014] The invention described in claim 4 is characterized in that, in claim 1, the state determination means predicts when the bearing will fail based on the state of the bearing detected by the state detection means, and the notification means notifies of the predicted time of failure.

[0015] In the invention as recited in claim 4, the state determination means predicts the time of failure of the bearing, allowing the user to grasp the tendency of failure based on the predicted time of failure.

[0016] The invention as set forth in claim 5 is characterized in that in claim 1, the state detection means is a vibration sensor that detects the acceleration, velocity, and displacement of vibration of the bearing.

[0017] In the invention described in claim 5, a single vibration sensor can be used to detect the acceleration, speed, and displacement of bearing vibration, eliminating the need to provide a sensor for detecting acceleration, a sensor for detecting speed, and a sensor for detecting displacement as state detection means.

[0018] The invention described in claim 6 is a fan according to any one of claims 1 to 5, wherein the rotating device is a fan including a motor which is the rotating body on the drive side, an impeller which is the rotating body on the driven side, a motor side pulley provided on a motor side rotating shaft which is the rotating shaft on the motor side, an impeller side pulley provided on an impeller side rotating shaft which is the rotating shaft on the impeller side, and a belt wound around the motor side pulley and the impeller side pulley, and the state detection means is provided at at least one location on the bearings which are provided in pairs on each of the motor side rotating shaft and the impeller side rotating shaft.

[0019] In the invention described in claim 6, a condition detection means is provided for each of a bearing provided on the motor-side rotating shaft of the motor, which is the driving-side rotating body, and a bearing provided on the impeller-side rotating shaft of the impeller, which is the driven-side rotating body. This makes it possible to know in detail the condition of the bearings of the rotating shafts provided in the fan.

[0020] The invention described in claim 7 is based on claim 6 and is characterized in that it comprises an operating time measuring means for measuring the operating time of the status monitoring system, a temperature measuring means for measuring the temperature within the status monitoring system, and a wind pressure measuring means for measuring the wind pressure from the fan, and the status of the status monitoring system is grasped based on the operating time measured by the operating time measuring means, the temperature measured by the temperature measuring means, and the wind pressure measured by the wind pressure measuring means.

[0021] In the invention described in claim 7, the operating time of the condition monitoring system, the temperature inside the condition monitoring system, and the wind pressure from the fan are measured, so that it is possible to grasp not only abnormalities in the rotating equipment itself, but also the condition of the condition monitoring system equipped with the rotating equipment. [Effects of the Invention]

[0022] As described above in detail, according to the inventions set forth in claims 1 to 7, by clarifying the cause of an abnormality, it becomes possible to carry out appropriate repairs and maintenance. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a schematic cross-sectional view showing a fan state monitoring system according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 2 is a front view showing a display on which an initial screen is displayed. [Figure 4] FIG. 10 is a front view of the display showing a diagnostic screen for the fresh air supply fan. [Figure 5] A judgment table used to judge the condition of bearings. [Figure 6] FIG. 10 is a front view showing a display on which a fault diagnosis table showing the relationship between diagnosed abnormality names, phenomena, investigation methods, and repair methods is displayed. DETAILED DESCRIPTION OF THE INVENTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] As shown in FIG. 1, a condition monitoring system 10 of this embodiment is a system that monitors the condition of a fan 20 (rotating equipment) for a paint booth (painting equipment). As shown in FIG. 2, the fan 20 includes a motor 31, which is a driving rotor, and an impeller 32, which is a driven rotor. The motor 31 is mounted on a support base 21. The impeller 32 is housed in a duct 22 mounted on the support base 21. The fan 20 also includes a motor-side pulley 33, an impeller-side pulley 34, and a belt 35 within a casing 23 attached to the side of the support base 21. The motor-side pulley 33 is provided at one end (the right end in FIG. 2) of a motor-side rotating shaft 36, which is the rotating shaft on the motor 31 side. The impeller-side pulley 34 is provided at one end (the right end in FIG. 2) of an impeller-side rotating shaft 37, which is the rotating shaft on the impeller 32 side. The belt 35 is wound around the motor-side pulley 33 and the impeller-side pulley 34 .

[0026] Furthermore, a pair of bearings is provided on each of the motor-side rotating shaft 36 and the impeller-side rotating shaft 37. Specifically, the motor-side rotating shaft 36 has a first bearing 41 on the side opposite the motor-side pulley 33 (on the left side in FIG. 2), and a second bearing 42 on the side of the motor-side pulley 33 (on the right side in FIG. 2). The impeller-side rotating shaft 37 has a third bearing 43 on the side of the impeller-side pulley 34 (on the right side in FIG. 2), and a fourth bearing 44 on the side opposite the impeller-side pulley 34 (on the left side in FIG. 2).

[0027] 1 and 2, the first bearing 41 is provided with a first vibration sensor SE1 (condition detection means) that detects the condition of the first bearing 41, and the second bearing 42 is provided with a second vibration sensor SE2 (condition detection means) that detects the condition of the second bearing 42. Furthermore, the third bearing 43 is provided with a third vibration sensor SE3 (condition detection means) that detects the condition of the third bearing 43, and the fourth bearing 44 is provided with a fourth vibration sensor SE4 (condition detection means) that detects the condition of the fourth bearing 44.

[0028] The first vibration sensor SE1 detects the acceleration (m / s 2 The second vibration sensor SE2 directly detects the effective value (RMS: root mean square) of the vibration of the second bearing 42 as a whole and the acceleration of the vibration at the characteristic frequency of the balls in the first bearing 41, and outputs a first acceleration detection signal to the CPU 52 of the control device 51 (see FIG. 1) via a sensor amplifier (not shown). Similarly, the second vibration sensor SE2 directly detects the effective value of the acceleration of the vibration of the second bearing 42 as a whole and the acceleration of the vibration at the characteristic frequency of the balls in the second bearing 42, and outputs a second acceleration detection signal to the CPU 52 via a sensor amplifier. The third vibration sensor SE3 directly detects the effective value of the acceleration of the vibration of the third bearing 43 as a whole and the acceleration of the vibration at the characteristic frequency of the balls in the third bearing 43, and outputs a third acceleration detection signal to the CPU 52 via a sensor amplifier. The fourth vibration sensor SE4 directly detects the effective value of the acceleration of the vibration of the entire fourth bearing 44 and the acceleration of the vibration at the characteristic frequency of the balls provided in the fourth bearing 44, and outputs a fourth acceleration detection signal to the CPU 52 via a sensor amplifier.

[0029] Next, the electrical configuration of the condition monitoring system 10 will be described.

[0030] As shown in FIG. 1, the condition monitoring system 10 includes a personal computer 50, which includes a control device 51 for controlling the entire system. The control device 51 is composed of a CPU 52, a ROM 53, a RAM 54, an input / output circuit, etc. The CPU 52 is electrically connected to the motor 31 of the fan 20 and controls it by a drive signal. A display 55 and a keyboard 56 are also electrically connected to the CPU 52. The display 55 in this embodiment is a display with a touch panel. Furthermore, a program for controlling the condition monitoring system 10 is stored in the ROM 53.

[0031] The CPU 52 is also electrically connected to the first vibration sensor SE1, the second vibration sensor SE2, the third vibration sensor SE3, and the fourth vibration sensor SE4. The CPU 52 is also electrically connected to the inverter IN1, which is a control device for the motor 31. The CPU 52 calculates a characteristic frequency of the entire first bearing 41 based on the rotation speed signal from the inverter IN1. The CPU 52 then calculates (indirectly detects) the effective value of the vibration speed (m / s) at the characteristic frequency of the entire first bearing 41 and the unbalance of the motor-side pulley 33 based on the acceleration measurement value indicated by the first acceleration detection signal from the first vibration sensor SE1. The "unbalance of the motor-side pulley 33" refers to the amount of change in vibration speed that occurs per rotation of the motor-side pulley 33. The CPU 52 also calculates (indirectly detects) the effective value of the vibration amplitude (displacement: mm) of the first bearing 41 based on the acceleration measurement value indicated by the first acceleration detection signal.

[0032] The CPU 52 also calculates a characteristic frequency of the entire second bearing 42 based on the rotation speed signal from the inverter IN1. The CPU 52 then calculates (indirectly detects) the effective value of the vibration speed at the characteristic frequency of the entire second bearing 42, the imbalance of the motor-side pulley 33, and the vibration speed at the frequency of a specific portion of the belt 35 based on the measurement value of the acceleration indicated by the second acceleration detection signal from the second vibration sensor SE2. Note that the "specific portion" refers to a portion of the belt 35 where a gap or the like exists. The presence of the specific portion makes the frequency of the specific portion different from the frequencies of other portions of the belt 35. The CPU 52 also calculates (indirectly detects) the effective value of the amplitude (displacement) of the vibration of the second bearing 42 based on the measurement value of the acceleration indicated by the second acceleration detection signal.

[0033] The CPU 52 also calculates a characteristic frequency of the entire third bearing 43 based on the rotation speed signal from the inverter IN1. The CPU 52 then calculates (indirectly detects) the effective value of the vibration speed at the characteristic frequency of the entire third bearing 43, the imbalance of the impeller-side pulley 34, and the vibration speed at the frequency of a specific portion of the belt 35 based on the measurement value of the acceleration indicated by the third acceleration detection signal from the third vibration sensor SE3. Note that the "imbalance of the impeller-side pulley 34" refers to the amount of change in vibration speed that occurs each time the impeller-side pulley 34 makes one rotation. The CPU 52 also calculates (indirectly detects) the effective value of the vibration amplitude (displacement) of the third bearing 43 based on the measurement value of the acceleration indicated by the third acceleration detection signal.

[0034] Furthermore, the CPU 52 calculates a characteristic frequency of the entire fourth bearing 44 based on the rotation speed signal from the inverter IN1. Then, the CPU 52 calculates (indirectly detects) an effective value of the vibration speed at the characteristic frequency of the entire fourth bearing 44 and an imbalance of the impeller 32 based on the measurement value of the acceleration indicated by the fourth acceleration detection signal from the fourth vibration sensor SE4. Furthermore, the CPU 52 calculates (indirectly detects) an effective value of the amplitude (displacement) of the vibration of the fourth bearing 44 based on the measurement value of the acceleration indicated by the fourth acceleration detection signal.

[0035] The timer included in the CPU 52 measures the operating time of the condition monitoring system 10 and stores the measured operating time in the RAM 54. That is, the CPU 52 functions as an "operating time measuring means." As shown in FIG. 1 , the condition monitoring system 10 is equipped with a temperature sensor 61, which is a temperature measuring means, and an air pressure sensor 62, which is an air pressure measuring means. The temperature sensor 61 is provided in a paint booth constituting the condition monitoring system 10, measures the temperature inside the paint booth, and outputs a temperature measurement signal to the CPU 52. The air pressure sensor 62 is provided near the duct 22 of the fan 20, measures the air pressure of the air discharged from the duct 22, and outputs an air pressure measurement signal to the CPU 52. The state of the condition monitoring system 10 is grasped based on the operating time measured by the CPU 52, the temperature measured by the temperature sensor 61, and the air pressure measured by the air pressure sensor 62.

[0036] Next, a method for monitoring the status of the fan 20 using the status monitoring system 10 will be described.

[0037] First, the CPU 52 of the control device 51 controls the display 55 to display a display section 71 (see FIG. 3) for the fresh air supply fan in the upper portion of the initial screen 70, and to display a display section 72 (see FIG. 3) for the recycle fan in the lower portion of the initial screen 70. The fresh air supply fan is a fan 20 for supplying air (fresh air) into the paint booth, and the recycle fan is a fan 20 for exhausting air from the paint booth to the outside. The CPU 52 also controls the display 55 to display an image Im1 (see FIG. 3) of the fan 20 at the top of each of the display sections 71 and 72. The image Im1 indicates the positions of the first to fourth vibration sensors SE1 to SE4. The CPU 52 also controls the display 55 to display a first vibration sensor selection button 73, a second vibration sensor selection button 74, a third vibration sensor selection button 75, and a fourth vibration sensor selection button 76 in this order from top to bottom on the left side of the image Im1 of each of the display sections 71 and 72 (see FIG. 3). Each of the vibration sensor selection buttons 73 to 76 is a rectangular icon, and is labeled with the characters "SE1," "SE2," "SE3," and "SE4," respectively.

[0038] When the user touches the first vibration sensor selection button 73, the CPU 52 controls the monitoring information display unit 77 located directly below the image Im1 to display monitoring information detected by the first vibration sensor SE1 of the first bearing 41. In this embodiment, the monitoring information displayed includes the "speed" of the bearing vibration, the "acceleration" of the bearing vibration, the "displacement (amplitude)" of the bearing vibration, the "bearing" acceleration, the "unbalance" speed, and the "belt" speed (see FIG. 3). When the user touches the second vibration sensor selection button 74, the CPU 52 controls the monitoring information display unit 77 to display monitoring information detected by the second vibration sensor SE2 of the second bearing 42. Similarly, when the third vibration sensor selection button 75 is touched, the CPU 52 controls the monitoring information display unit 77 to display the monitoring information detected by the third vibration sensor SE3, and when the fourth vibration sensor selection button 76 is touched, the CPU 52 controls the monitoring information display unit 77 to display the monitoring information detected by the fourth vibration sensor SE4.

[0039] Furthermore, CPU 52 performs control to display an abnormality diagnosis button 78 for the fresh air supply fan in the lower left portion of display section 71 for the fresh air supply fan, and also performs control to display an abnormality diagnosis button 79 for the recycle fan in the lower left portion of display section 72 for the recycle fan (see FIG. 3). Note that abnormality diagnosis buttons 78, 79 are rectangular icons with the words "abnormality diagnosis" attached to them.

[0040] Next, the user selects the fan 20 to be diagnosed for an abnormality from among the fresh air intake fan and the recycle fan. Specifically, the user touches one of the two abnormality diagnosis buttons 78, 79 displayed on the initial screen 70.

[0041] Then, the CPU 52 switches the display content of the display 55 in response to the user's touch operation of the abnormality diagnosis buttons 78, 79. For example, when the user touches the abnormality diagnosis button 78, the CPU 52 switches to a diagnosis screen 80 (see FIG. 4) for the fresh air supply fan. The CPU 52 then controls the diagnosis screen 80 so that a first vibration sensor monitor 81 (see FIG. 4) for the first vibration sensor SE1 is displayed in a position closer to the upper left of the diagnosis screen 80, and a second vibration sensor monitor 82 (see FIG. 4) for the second vibration sensor SE2 is displayed in a position closer to the upper right of the diagnosis screen 80. The first vibration sensor monitor 81 displays monitoring information detected by the first vibration sensor SE1, and the second vibration sensor monitor 82 displays monitoring information detected by the second vibration sensor SE2. Furthermore, the CPU 52 performs control to display a third vibration sensor monitor 83 (see FIG. 4) for the third vibration sensor SE3 directly below the first vibration sensor monitor 81, and to display a fourth vibration sensor monitor 84 (see FIG. 4) for the fourth vibration sensor SE4 directly below the second vibration sensor monitor 82. The third vibration sensor monitor 83 displays monitoring information detected by the third vibration sensor SE3, and the fourth vibration sensor monitor 84 displays monitoring information detected by the fourth vibration sensor SE4.

[0042] Furthermore, the CPU 52 performs control to display a rectangular frame 85 (see FIG. 4) directly below the vibration sensor monitors 83 and 84. The CPU 52 also performs control to display an abnormality reset button 86 (see FIG. 4) and a details display button 87 (see FIG. 4) in a position between the frame 85 and the vibration sensor monitors 83 and 84, in the upper right position of the frame 85. The abnormality reset button 86 is a rectangular icon with the words "abnormality reset" attached to it. The details display button 87 is a rectangular icon with the words "details display" attached to it. The CPU 52 also performs control to display a back button 88 (see FIG. 4) in the upper left of the diagnosis screen 80. When the user touches the back button 88, the CPU 52 performs control to return the diagnosis screen 80 to the initial screen 70 (see FIG. 3) on which the display section 71 for the fresh air intake fan and the display section 72 for the recycle fan are displayed.

[0043] The CPU 52 also determines whether the states of the first to fourth bearings 41 to 44 detected by the first to fourth vibration sensors SE1 to SE4 are abnormal or not, based on a determination table (see FIG. 5) previously set (stored) in the ROM 53. That is, the CPU 52 functions as a "state determination means." The determination table is created from data collected using various sensors of the test fan.

[0044] More specifically, the CPU 52 determines (investigates) the state of the bearings 41 to 44 by using data obtained by performing a fast Fourier transform (FFT) on the vibrations of the bearings 41 to 44. If the determination result by the state determination means is positive, for example, if it is determined that a change has been observed in at least one of the states of the bearings 41 to 44 (see "△" in FIG. 5), or if it is determined that the state of the bearings 41 to 44 has exceeded a threshold (caution value) that indicates an abnormal state (see "X" in FIG. 5), the CPU 52 diagnoses the nature of the abnormal state.

[0045] A specific example (a specific example of an "abnormality in the bearing on the side opposite the impeller to the pulley") will be described below. In this specific example, the effective value of the acceleration of the vibration of the entire fourth bearing 44 (see "A" in FIG. 5) exceeds the threshold value. The acceleration of the vibration of the balls of the fourth bearing 44 (see "B" in FIG. 5) also exceeds the threshold value. Meanwhile, a change is observed in at least one of the effective value of the vibration velocity of the entire fourth bearing 44 (see "C" in FIG. 5), the effective value of the acceleration of the vibration of the entire third bearing 43 (see "F" in FIG. 5), and the acceleration of the vibration of the balls of the third bearing 43 (see "G" in FIG. 5). If these conditions are met, the CPU 52 diagnoses that the abnormal state is an abnormality in the fourth bearing 44. Furthermore, if the operating time of the fan 20 (see FIG. 5) has reached the failure time (here, 20,000 hours), the CPU 52 diagnoses that the fourth bearing 44 has reached the end of its life, regardless of whether an abnormality has been diagnosed in the second bearing 44. In such cases, the CPU 52 performs control to display (notify) the characters L0 (see FIG. 4) "Abnormality in bearing on anti-pulley side of impeller" as the name of the diagnosed abnormality within a frame 85 on the display 55. This also notifies the user that the fourth bearing 44 is nearing the failure time (the time when a failure is likely to occur).

[0046] In this embodiment, in addition to the timing of failure of the fourth bearing 44, the timing of failure of the first bearing 41 ("abnormality in bearing on the side opposite the motor pulley"), the timing of failure of the second bearing 42 ("abnormality in bearing on the side opposite the motor pulley"), and the timing of failure of the third bearing 43 ("abnormality in bearing on the side opposite the impeller pulley") are also predicted based on the states of the first to fourth bearings 41 to 44 detected by the first to fourth vibration sensors SE1 to SE4. Furthermore, the timing of poor lubrication of the third and fourth bearings 43, 44 ("poor lubrication of impeller bearing"), the timing of loosening of the belt 35 ("loosening of V-belt"), and the timing of damage to the belt 35 ("damage to V-belt") are also predicted based on the states of the first to fourth bearings 41 to 44.

[0047] Then, in response to a user touch operation of the detail display button 87, the CPU 52 performs control to switch the diagnostic screen 80 on the display 55 to another diagnostic screen 90 (see FIG. 4 ). Next, the CPU 52 outputs a drive signal to the display 55 to display (notify) the diagnostic screen 90 on the display 55 with the details of the abnormal condition, the method of investigating the abnormal condition, and the method of dealing with the abnormal condition. In other words, the display 55 functions as a "notification means." Specifically, the CPU 52 outputs a drive signal to the display 55 to display (notify) the name of the diagnosed abnormality (the text L1 reading "Abnormality in bearing on the anti-pulley side of the impeller") on the diagnostic screen 90. The CPU 52 also outputs a drive signal to the display 55 to display (notify) the details of the abnormal condition (the text L2 reading "Damage to outer / inner rings, balls, or cage") in the "Symptom" column 91 on the diagnostic screen 90. Furthermore, the CPU 52 outputs a drive signal to the display 55, and performs control to display (notify) an investigation method for the abnormal state (the characters L3, "Auditory confirmation, FFT analysis") in the "Investigation method" column 92 of the diagnosis screen 90. The CPU 52 also outputs a drive signal to the display 55, and performs control to display (notify) a method for dealing with the abnormal state (the characters L4, "Replace bearing") in the "Repair method" column 93 of the diagnosis screen 90. By viewing these characters L1 to L4, the user can take appropriate action. Note that when the user touches the abnormality reset button 86 while the character L0 is displayed within the frame 85, the CPU 52 performs control to erase the character L0.

[0048] When the user touches a fault diagnosis button 102 in a maintenance menu 101 (see FIG. 6) displayed on the left side of the display 55, the CPU 52 can control the display of a fault diagnosis table (see FIG. 6). The fault diagnosis table indicates the relationship between a "diagnosed abnormality name," "phenomenon," "investigation method," and "repair method." The CPU 52 also controls the display of the fault diagnosis table to highlight a portion corresponding to a hypothetical abnormal state. Specifically, the CPU 52 surrounds the portion with a bold frame 111 and displays the portion in a color (orange in this embodiment) different from the other portions. The maintenance menu 101 also displays an inspection item button 103 for viewing materials useful for maintenance, a maintenance parts button 104 for viewing a parts list, and a maintenance history button 105 for viewing a maintenance history.

[0049] Next, another specific example (a specific example of "unbalance of a rotating body") will be described. In this specific example, the effective value of the vibration velocity of the entire fourth bearing 44 (see "C" in FIG. 5) exceeds the threshold value. The imbalance of the impeller 32 (see "D" in FIG. 5) also exceeds the threshold value. Meanwhile, a change is observed in at least one of the effective value of the acceleration of the vibration of the entire fourth bearing 44 (see "A" in FIG. 5), the acceleration of the vibration of the balls of the fourth bearing 44 (see "B" in FIG. 5), the effective value of the vibration amplitude of the fourth bearing 44 (see "E" in FIG. 5), the effective value of the acceleration of the vibration of the entire third bearing 43 (see "F" in FIG. 5), the acceleration of the vibration of the third bearing 43 (see "G" in FIG. 5), the effective value of the vibration velocity of the entire third bearing 43 (see "H" in FIG. 5), and the imbalance of the impeller-side pulley 34 (see "I" in FIG. 5). If these conditions are met, the CPU 52 diagnoses that the abnormal state is an abnormality in the impeller 32. In this case, the CPU 52 performs control to display (notify) the text "Unbalance of the rotating body (impeller 32) (see FIGS. 5 and 6)" in the frame 85 as the name of the diagnosed abnormality.

[0050] Then, after switching the diagnostic screen 80 on the display 55 to another diagnostic screen 90, the CPU 52 outputs a drive signal to the display 55 and controls the display 55 to display (notify) the name of the diagnosed abnormality (the text "Unbalance of Rotating Body") on the diagnostic screen 90. At the same time, the CPU 52 outputs a drive signal to the display 55 and controls the display 55 to display the details of the abnormality (the text "Foreign matter adhesion, impeller damage (see FIG. 6)") in a "phenomenon" column 91. This allows the user to know that the cause of the unbalance of the rotating body (impeller 32) is that the center of rotation of the impeller 32 has shifted from the center of the impeller-side rotating shaft 37 due to the adhesion of foreign matter (dirt) or damage to the impeller 32. The CPU 52 also outputs a drive signal to the display 55 and controls the display 55 to display an investigation method for the abnormality (the text "Visual inspection, FFT analysis (see FIG. 6)") in a "investigation method" column 92. Furthermore, the CPU 52 outputs a drive signal to the display 55, and performs control to display a method for dealing with the abnormal state (the text "Remove foreign matter, repair impeller (see FIG. 6)") in the "repair method" column 93.

[0051] Yet another specific example (a specific example of "fluctuations in air blowing load" and "fluctuations in rotation speed") will be described. In this specific example, the current value applied to motor 31 of fan 20 exceeds the threshold value. On the other hand, a change is observed in at least one of the following: the effective value of the vibration acceleration of the entire bearings 41-44 (see "A," "F," "L," and "R" in FIG. 5 ), the vibration acceleration of the balls of the bearings 41-44 (see "B," "G," "M," and "S" in FIG. 5 ), the effective value of the vibration velocity of the entire bearings 41-44 (see "C," "H," "N," and "T" in FIG. 5 ), the vibration velocity imbalance (see "D," "I," "O," and "U" in FIG. 5 ), the vibration velocity at the frequency of a specific portion of the belt 35 detected in the bearings 42 and 43 (see "J" and "P" in FIG. 5 ), and the effective value of the vibration amplitude of the bearings 41-44 (see "E," "K," "Q," and "V" in FIG. 5 ). If these conditions are met, the CPU 52 diagnoses that the abnormal state is an abnormal current value. In this case, the CPU 52 performs control to display (notify) the words "Fluctuation in airflow load (see Figures 5 and 6)" and "Fluctuation in rotation speed (see Figures 5 and 6)" within the frame 85 as the name of the diagnosed abnormality.

[0052] Then, after switching the diagnostic screen 80 on the display 55 to another diagnostic screen 90, the CPU 52 outputs a drive signal to the display 55, and performs control to display (notify) the name of the diagnosed abnormality (the text "Variation in airflow load" and "Variation in rotation speed") on the diagnostic screen 90. At the same time, the CPU 52 outputs a drive signal to the display 55, and performs control to display (notify) the details of the abnormal condition (the text "Increase in air volume, etc. (see FIG. 6)" and "Increase in rotation speed (see FIG. 6)") in a "phenomenon" column 91. The CPU 52 also outputs a drive signal to the display 55, and performs control to display (notify) an investigation method for the abnormal condition (the text "Check operating conditions (see FIG. 6)") in a "investigation method" column 92. Furthermore, the CPU 52 outputs a drive signal to the display 55, and controls the display 55 to display (notify) how to deal with the abnormal condition (the text "Adjust the air volume, etc. (see Figure 6)" and "Adjust the rotation speed (see Figure 6)") in the "Repair method" column 93.

[0053] Therefore, according to this embodiment, the following effects can be obtained.

[0054] (1) In the condition monitoring system 10 of this embodiment, when the CPU 52 determines that the condition of the bearings 41-44 detected by the vibration sensors SE1-SE4 is abnormal based on a preset determination table (see FIG. 5), the display 55 notifies the user of the nature of the abnormal condition and how to deal with the abnormal condition. This allows the user to perform appropriate repairs and maintenance based on the notified remedy, even if the user does not have knowledge of analyzing abnormal conditions. Furthermore, rather than performing periodic maintenance, the user only needs to perform maintenance when the bearings 41-44 become abnormal and a remedy is notified. This eliminates the need for excessive repairs during maintenance work, thereby reducing maintenance costs.

[0055] (2) In this embodiment, appropriate repairs and maintenance are performed based on the countermeasures for the notified abnormal state, thereby preventing the occurrence of a sudden failure of the fan 20. Therefore, it is possible to prevent work stoppages in the paint booth due to a failure of the fan 20.

[0056] (3) In this embodiment, when it is determined that the current value applied to motor 31 of fan 20 exceeds the threshold value indicating an abnormal state, a notification is issued (displayed in "Repair Method" column 93 on diagnostic screen 90) urging the user to "adjust the airflow (of impeller 32) (see FIG. 6)" or "adjust the rotation speed (of motor 31) (see FIG. 6)." Therefore, by the user adjusting the airflow or rotation speed, it is possible to prevent damage to fan 20 (specifically, motor 31, impeller 32, pulleys 33 and 34, belt 35, rotating shafts 36 and 37, and bearings 41 to 44) due to a large load.

[0057] The above embodiment may be modified as follows.

[0058] In the above embodiment, when it is determined that the condition of the first to fourth bearings 41 to 44 has exceeded a first threshold value that is close to an abnormal state, the display 55 may be configured to issue a first notification that the condition of the bearings 41 to 44 is close to an abnormal state. Furthermore, when it is determined that the condition of the bearings 41 to 44 has exceeded a second threshold value that indicates an abnormal state, the display 55 may be configured to issue a second notification that the condition of the bearings 41 to 44 is in an abnormal state. Here, it is preferable that the first and second notifications have different notification modes. In this way, the condition of the bearings 41 to 44 is notified in stages, allowing preparations to be made in advance to deal with the abnormal state.

[0059] In the specific example of "an abnormality in the bearing on the non-pulley side of the impeller (see FIG. 5)," the first notification may be issued when it is determined that any one of "C," "F," and "G" has exceeded the first threshold value ("△"), or the first notification may be issued only when it is determined that all of "C," "F," and "G" have exceeded the first threshold value. Similarly, the second notification may be issued when it is determined that either one of "A" and "B" has exceeded the second threshold value ("X"), or the second notification may be issued only when it is determined that both "A" and "B" have exceeded the second threshold value. Furthermore, after the first notification is issued when the condition of the bearings 41 to 44 has exceeded the first threshold value, the second notification may be issued if it is determined that the condition of the bearings 41 to 44 has exceeded the second threshold value.

[0060] The first to fourth vibration sensors SE1 to SE4 in the above embodiment are sensors that directly detect the acceleration of vibrations of the first to fourth bearings 41 to 44 and indirectly detect the speed and displacement. However, the vibration sensors may also be sensors that directly detect the speed or displacement of vibrations of the first to fourth bearings 41 to 44. Furthermore, the vibration sensors may be sensors that detect any one of the acceleration, speed, and displacement of vibrations of the first to fourth bearings 41 to 44, or sensors that detect all of them.

[0061] In the above embodiment, the first to fourth vibration sensors SE1 to SE4 are provided for all of the first to fourth bearings 41 to 44, which are provided in pairs on each of the motor-side rotating shaft 36 and the impeller-side rotating shaft 37. However, vibration sensors may be provided at only one to three locations among the first to fourth bearings 41 to 44.

[0062] In the above embodiment, the fan 20 is used as the rotating device for the coating equipment, but other devices such as a pump may also be used as the rotating device.

[0063] The condition monitoring system 10 in the above embodiment is a system for monitoring rotating equipment for a paint booth, which is a painting facility. However, it may also be a system for monitoring rotating equipment for other painting facilities, such as a drying oven.

[0064] Next, in addition to the technical ideas set forth in the claims, the technical ideas grasped by the above-described embodiments will be listed below.

[0065] (1) A rotating equipment condition monitoring system according to claim 1, characterized in that the condition determination means determines the condition of the bearing by using data obtained by performing a fast Fourier transform on the vibration of the bearing detected by the condition detection means.

[0066] (2) A rotating equipment status monitoring system according to claim 1, characterized in that when the status determination means determines that the current value applied to the motor, which is the rotating body, exceeds a threshold value that indicates an abnormal state, the notification means notifies the user of the details of the abnormal state and how to deal with the abnormal state. [Explanation of symbols]

[0067] 10...Rotating equipment condition monitoring system 20...Fans as rotating equipment 31...Motor as a driving rotating body 32... Impeller as the driven rotating body 33...Motor side pulley 34...Impeller side pulley 35...Belt 36...Motor side rotating shaft as the motor side rotating shaft 37... Impeller side rotating shaft as the impeller side rotating shaft 41...First bearing as a bearing 42...Second bearing as bearing 43...Third bearing as a bearing 44...Fourth bearing as a bearing 52...CPU as a state determination means and an operation time measurement means 55...Display as a means of notification 61...Temperature sensor as a temperature measuring means 62...Wind pressure sensor as a means for measuring wind pressure SE1: First vibration sensor as a state detection means and a vibration sensor SE2: Second vibration sensor as a state detection means and a vibration sensor SE3: A third vibration sensor serving as a state detection means and a vibration sensor SE4: A fourth vibration sensor serving as a state detection means and a vibration sensor

Claims

1. A system for monitoring the condition of rotating equipment for a coating facility, comprising: a state detection means provided on a bearing of a rotating shaft of a rotating body constituting the rotating device, the state detection means detecting a state of the bearing; a state determination means for determining whether the state of the bearing detected by the state detection means is an abnormal state based on a predetermined determination table; a notification means for notifying the user of the abnormal state and a method for dealing with the abnormal state when the determination result by the state determination means is affirmative; A status monitoring system for a rotating machine, comprising:

2. 2. The rotating machine status monitoring system according to claim 1, wherein the notification means notifies a method for investigating the abnormal state.

3. when the state determination means determines that the state of the bearing has exceeded a first threshold value that is close to the abnormal state, the notification means issues a first notification that notifies that the state of the bearing is close to the abnormal state, when the state determination means determines that the state of the bearing has exceeded a second threshold value at which the bearing is in the abnormal state, the notification means issues a second notification to notify that the state of the bearing is in the abnormal state; The first notification and the second notification have different notification modes.

2. The rotating equipment status monitoring system according to claim 1.

4. the state determination means predicts a time when the bearing will fail based on the state of the bearing detected by the state detection means, The notification means notifies the predicted time of failure.

2. The rotating equipment status monitoring system according to claim 1.

5. 2. The rotating equipment condition monitoring system according to claim 1, wherein the condition detection means is a vibration sensor that detects the acceleration, velocity, and displacement of vibrations of the bearing.

6. The rotating device includes: a motor which is the rotating body on the drive side; an impeller which is the driven rotating body; a motor-side pulley provided on the motor-side rotating shaft, which is the rotating shaft on the motor side; an impeller-side pulley provided on the impeller-side rotating shaft, which is the rotating shaft on the impeller side; a belt wound around the motor-side pulley and the impeller-side pulley; A fan comprising: The state detection means is provided at at least one location of the bearings provided in pairs on the motor-side rotating shaft and the impeller-side rotating shaft.

6. The rotating machine status monitoring system according to claim 1.

7. an operating time measurement means for measuring an operating time of the status monitoring system; a temperature measuring means for measuring a temperature within the status monitoring system; a wind pressure measuring means for measuring the wind pressure from the fan; Equipped with The state of the state monitoring system is grasped based on the operation time measured by the operation time measuring means, the temperature measured by the temperature measuring means, and the wind pressure measured by the wind pressure measuring means.

7. The rotating equipment status monitoring system according to claim 6.

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