Predictive maintenance device and predictive maintenance method for driving equipment

Abstract

To make it possible to acquire a change which indicates a sign with respect to drive equipment used for a packaging machine before occurrence of malfunction due to deterioration and abnormality, and to achieve maintenance of the drive equipment.SOLUTION: A sign maintenance device 4 for drive equipment 3 for a packaging machine which is driven in such a manner that drive energy is fed thereto from drive energy supply unit 2. The sign maintenance device 4 comprises: a drive energy change acquisition unit 5 which acquires change in drive energy supplied from the drive energy supply unit 2 to the drive equipment 3 in the state that the drive equipment 3 normally operates; a sign determination unit 6 which determines such a sign that malfunction occurs in the drive equipment 3 on the basis of drive energy change acquired by the drive energy change acquisition unit 5; and a determination result output unit 7 which outputs a determination result of the sign determination unit 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a predictive maintenance device and a predictive maintenance method for driving equipment such as servo motors, air cylinders, and heaters in packaging machines such as horizontal pillow packaging machines, vertical pillow packaging machines, overwrap packaging machines, and wrapping packaging machines. [Background technology]

[0002] BACKGROUND ART Packaging machines such as horizontal pillow packaging machines, vertical pillow packaging machines, overwrap packaging machines, and wrapping packaging machines use various driving devices such as servo motors, air cylinders, and heaters for heat sealers. These drive devices can fail due to various factors, in which case they are repaired or replaced. However, in order to minimize the disruption to production caused by repairs or replacements of drive devices, various diagnostic devices have been proposed to detect drive device failures in advance. For example, Patent Document 1 (JP 2001-261145 A) discloses an article transport device equipped with a transport conveyor driven by a motor, which is equipped with a current measuring means for measuring the magnitude of the current flowing through the motor, an alarm determining means for outputting an alarm signal when the magnitude of the current measured by the current measuring means exceeds a reference value, and an alarm means for operating in response to the alarm signal. Patent Document 2 (JP 2005-528291 A) discloses a system for identifying abnormal operation of a packaging machine, the system including: a sampling entity arranged to sample a signal issued to a servo motor during use corresponding to a torque value of the servo motor; a spectrum analyzer for generating a spectrum analysis of the sampled signal; and a processing unit coupled to a storage device for storing a characterization corresponding to an operating state of a mechanical element coupled to the servo motor, the characterization corresponding to at least one predetermined value for at least one respective frequency of the signal; the processing unit arranged to determine abnormal operation of the mechanical element during use using the spectrum analysis of the sampled signal and the characterization of the mechanical element. Patent Document 3 (JP 2012-1211 A) discloses an automatic packaging machine that uses an air cylinder as the drive source for opening and closing a sealer. The sealer closing operation time and sealer opening operation time are calculated and displayed from the signal input of a reed switch that detects the forward end position of the piston rod of the air cylinder, the sealer closing signal output, and the sealer opening signal output, making it possible to monitor them. The automatic packaging machine also has a function to set an allowable time for the closing operation time and the opening operation time and to monitor and issue an alarm to stop the machine if the time is exceeded, and a function to issue an alarm to stop the machine if the reed switch is lost between the time when the sealer closing signal output is output and the reed switch confirms that the sealer is closed, and the time when the opening signal output is output.

[0003] However, the conveying device of Patent Document 1 outputs an alarm signal when a load is generated that prevents the conveyor from running smoothly, causing the motor torque to increase and the magnitude of the current flowing through the motor to exceed a reference value.The conveying device of Patent Document 1, however, is unable to detect slight malfunctions such as when the operation of a geared motor that controls position, speed, etc., such as a servo motor with a reducer, changes due to wear on the gear head or lack of oil in the bearings, and to take maintenance measures before an abnormality occurs. Furthermore, the packaging system of Patent Document 2 analyzes the spectral signal corresponding to the torque value of the servo motor to monitor the operating status of the mechanical elements connected to the servo motor, such as wear of the chain, belt, bearings, etc., and determines abnormal operation of the mechanical elements. Therefore, similar to Patent Document 1, in a geared motor such as a servo motor with a reducer, when the operation of the motor changes due to wear of the gear head or lack of oil in the bearings, it is not possible to detect slight malfunctions of the servo motor that would not be determined to be abnormal operation from the analysis of the spectral signal corresponding to the torque value of the servo motor, and to take maintenance measures before an abnormality occurs. Furthermore, in the automatic packaging machine of Patent Document 3, if the sealer closing operation time or sealer opening operation time exceeds the allowable time, a warning is issued to stop the machine, and if an air leak occurs in the air cylinder that does not change the sealer closing operation time or sealer opening operation time, a warning is not issued to stop the machine, and it is not possible to detect slight changes such as air leakage in the air cylinder and take measures to prevent an abnormality from occurring.

[0004] In this regard, Patent Document 4 (JP 2017-167815 A) discloses an equipment management system that manages multiple production line component devices that make up a production line that produces goods, wherein the production line component devices include a weighing device that weighs the goods, a packaging device that packages the goods, and / or a packing device that boxes the packaged goods, and the equipment management system is equipped with an information storage unit that stores part information about parts included in the production line component devices, an information analysis unit that performs analytical processing to analyze the part information stored in the information storage unit, and a maintenance information output unit that outputs maintenance information about the parts based on the results of the analytical processing. In this device management system, device status data storage unit 90d (information accumulation unit) stores device status data DT, which is information that identifies (estimates or predicts) the operating state, capacity value, functional characteristics, poor adjustment, deterioration over time, or failure of parts included in production line component devices 112. Examples of this device status data DT include parameters such as "the time from when the knife starts to drive until the auto switch (sensor) responds" and "output value of the air pressure sensor" that identify signs of deterioration or poor adjustment of the knife cylinder of horizontal sealing mechanism 25 of form-fill-seal machine 20, "encoder pulse value of the pressure motor during vertical sealing" that identify signs of deterioration (looseness) or poor adjustment of the timing belt of form-fill-seal machine 20, and "load factor of each motor (servo motor)" that identify insufficient lubrication of each sliding part included in form-fill-seal machine 20, wear of the bearings, or an abnormality in the mechanical condition. Then, if the parameter related to the device status data DT of the target part is significantly larger or smaller in value compared to the corresponding parameters of other components, or if it falls outside the numerical range defined in the capacity information, the analysis unit 90i (information analysis unit) determines that there is a high possibility that the target part is showing signs of deterioration, is poorly adjusted, or has some kind of abnormality. However, the equipment management system of Patent Document 4 determines whether the target parts show signs of deterioration, poor adjustment, or some other abnormality based on equipment status data DT, such as the operating time and air pressure of the knife cylinder (air cylinder), the encoder pulse value of the pressure motor, and the load rate of the servo motor, and like the automatic packaging machine of Patent Document 3, it is unable to detect air leaks in air cylinders where the operating time and air pressure of the knife cylinder do not change, and take steps to maintain the system before an abnormality occurs.Furthermore, like Patent Document 2, it is unable to detect slight malfunctions in the servo motor that do not result in signs of deterioration, etc., based on the encoder pulse value of the pressure motor and the load rate of the servo motor, and take steps to maintain the system before an abnormality occurs. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-261145 [Patent Document 2] Special Publication No. 2005-528291 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-1211 [Patent Document 4] Japanese Patent Application Publication No. 2017-167815 Summary of the Invention [Problem to be solved by the invention]

[0006] The problem that the present invention aims to solve is to enable the maintenance of driving equipment used in packaging machines by acquiring changes that indicate signs of malfunction due to deterioration or abnormality before such malfunction occurs. [Means for solving the problem]

[0007] The invention of claim 1 is a predictive maintenance device for a servo motor of a packaging machine, comprising: a current value acquisition means for continuously acquiring the current value of a drive current supplied to the servo motor when the servo motor is operating normally; and a current value acquisition means for continuously acquiring the current value of a drive current supplied to the servo motor when no fault occurs in a device operated by the rotation of the servo motor. The aforementioned a reference current waveform storage means for storing a reference current waveform representing a change in the current value of the drive current over time, and a comparison of the drive current waveform representing a change in the current value of the drive current of the servo motor acquired by the current value acquisition means with the reference current waveform stored in the reference current waveform storage means; The value of the current difference waveform obtained from the difference between the drive current waveform and the reference current waveform The above problem is solved by providing a predictive maintenance device for a servo motor, which is equipped with a comparison and judgment means that judges that a malfunction has occurred in the operating equipment when the value of the comparison and judgment means exceeds a predetermined range, and that there is a sign of a malfunction in the servo motor, and a judgment result output means that outputs the judgment result of the comparison and judgment means.

[0009] Claim 2 The invention further comprises a drive current waveform display means for displaying the drive current waveform, and a predetermined range setting means for setting the predetermined range. Servo motorThe present invention provides a predictive maintenance device that solves the above problems. [Effects of the Invention]

[0015] The invention of claim 1 Servo motor In the predictive maintenance device of the packaging machine Servo motor Before malfunctions due to deterioration or abnormalities occur, changes that indicate such malfunctions are detected. Servo motor This has the effect of ensuring the preservation of the environment.

[0017] Claim 2 The predictive maintenance device for a driving machine according to the invention described in claim 1 This invention has the same effect as that of the previous invention. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a block diagram showing a configuration of a predictive maintenance system for moving machines including a predictive maintenance device for moving machines according to the present invention; [Figure 2] 1 is a block diagram showing an example configuration of a servo motor predictive maintenance system and a predictive maintenance device. [Figure 3] FIG. 10 is a block diagram showing the configuration of another example of a servo motor predictive maintenance system and a predictive maintenance device. [Figure 4] FIG. 1 is a block diagram showing the configuration of an air cylinder predictive maintenance system and a predictive maintenance device. [Figure 5] 1 is a block diagram showing the configuration of an example of a heater predictive maintenance system and a predictive maintenance device. [Figure 6] FIG. 10 is a block diagram showing the configuration of another example of a heater predictive maintenance system and a predictive maintenance device. [Figure 7] FIG. 1 is a perspective view showing the schematic configuration of an end seal cutting device. [Figure 8] This is a left side view of the end seal cutting device. [Figure 9] FIG. 2 is a front view of the opening / closing toggle mechanism rotating portion. [Figure 10] 10 is a flowchart showing the operation of the predictive maintenance device 4. [Figure 11] 4 is a flowchart showing the operation of the servo motor predictive maintenance device 14. [Figure 12] 10 is a graph showing a change in speed when the servo motor 13a opens and closes the heater blocks 61 and 62, and a graph showing a change in the current value of the drive current supplied to the servo motor 13a. [Figure 13] 10 is a graph showing an example of a change in current value (driving current waveform) when a fault occurs in a device that is operated by the rotation of a servo motor 13a, and a graph showing a change in the current value difference. [Figure 14] 10 is a flowchart showing the operation of the servo motor predictive maintenance device 24. [Figure 15] 10 is a flowchart showing the operation of the air cylinder predictive maintenance device 34. [Figure 16] 10 is a flowchart showing the operation of the heater predictive maintenance device 44. [Figure 17] 10 is a flowchart showing the operation of a heater predictive maintenance device 54. DETAILED DESCRIPTION OF THE INVENTION

[0024] [Configuration of predictive maintenance system and predictive maintenance device for drive equipment] FIG. 1 is a block diagram showing the configuration of a predictive maintenance system for moving machines that includes a predictive maintenance device for moving machines according to the present invention. In the figure, 1 is a predictive maintenance system, 2 is a drive energy supply unit, 3 is drive equipment, 4 is a predictive maintenance device, 5 is a drive energy change acquisition unit, 6 is a predictive maintenance judgment unit, and 7 is a judgment result output unit. As shown in FIG. 1, the predictive maintenance system 1 includes a drive energy supply unit 2, a drive machine 3, and a predictive maintenance device 4. The driving energy supply unit 2 supplies driving energy such as driving current and compressed air to the driving device 3. Specific examples include a commercial power source that supplies driving current, a power source such as a battery, and a compressor that supplies compressed air. The driving device 3 has a function of operating the packaging machine, and specific examples thereof include a servo motor, an air cylinder, and a heater for a heat sealer. The predictive maintenance device 4 has the function of detecting signs of malfunction due to deterioration or abnormality in the driving equipment 3 before such malfunction occurs and issuing an alarm, etc., thereby maintaining the driving equipment 3, and is composed of a driving energy change acquisition unit 5, a sign determination unit 6, and a determination result output unit 7. The drive energy change acquisition unit 5 acquires a change in drive energy supplied from the drive energy supply unit 2 to the drive machine 3 while the drive machine 3 is operating normally. The sign determining unit 6 determines whether or not there is a sign of malfunction in the movable machine 3 based on the change in the drive energy of the movable machine 3 detected by the drive energy change acquiring unit 5. The determination result output unit 7 outputs the result of the determination made by the sign determination unit 6 as to whether or not there is a sign of malfunction in the movable machine 3.

[0025] A case where the predictive maintenance system 1 shown in FIG. 1 is applied to an end sealing and cutting device (described later) of a horizontal pillow packaging machine will be described. [Servo motor predictive maintenance system, predictive maintenance device configuration] FIG. 2 is a block diagram showing the configuration of an example of a servo motor predictive maintenance system and predictive maintenance device for an end seal cutting device. In the figure, 11 is a servo motor predictive maintenance system, 12 is a power supply, 13 is a servo mechanism, 13a is a servo motor, 13b is a servo amplifier, 13c is a controller, 14 is a servo motor predictive maintenance device, 15 is a current value acquisition unit, 15a is a transmission unit, 15b is a reception unit, 15c is a communication line, 16 is an arithmetic and control device, 16a is a comparison and judgment unit, 16b is a reference current waveform storage unit, and 17 is an alarm. As shown in FIG. 2, the servo motor predictive maintenance system 11 is made up of a power supply 12, a servo mechanism 13, and a servo motor predictive maintenance device . The power supply 12 is a commercial power supply that serves as the drive energy supply unit 2, and supplies a drive current to the servo mechanism 13 (servo motor 13a). The servo mechanism 13 includes a servo motor 13a serving as the driving device 3, a servo amplifier 13b, and a controller 13c. In this servo mechanism 13, based on a command (command signal) from the controller 13c, the servo amplifier 13b controls the drive current supplied to the servo motor 13a to control the position and speed of the servo motor, thereby opening and closing the heater block (described later) of the end seal cutting device. The servo motor predictive maintenance device 14 is composed of a current value acquisition unit 15 which serves as the drive energy change acquisition unit 5, a calculation and control device 16 which serves as the predictive judgment unit 6, and an alarm 17 which serves as the judgment result output unit 7. The current value acquiring unit 15 includes a transmitting unit 15a, a receiving unit 15b, and a communication line 15c, and acquires the current value of the drive current supplied to the servo motor 13a. That is, in the current value acquisition unit 15, the transmission unit 15a continuously acquires the current value of the drive current supplied from the servo amplifier 13b to the servo motor 13a, transmits it to the reception unit 15b via the communication line 15c, and sends the current value received by the reception unit 15b to the calculation control device 16. This current value acquiring unit 15 may be configured to extract the current value of the drive current supplied from the servo amplifier 13b to the servo motor 13a as an analog signal and send it to the arithmetic and control device 16 via a transmission line or the like, instead of being equipped with the transmitting unit 15a, receiving unit 15b, and communication line 15c shown in FIG. 2. The calculation control device 16 is composed of a control computer that controls the operation of the horizontal pillow packaging machine, a calculation control unit of computer equipment such as a computer on the operation panel, a memory unit, etc., and is equipped with a comparison judgment unit 16a and a reference current waveform memory unit 16b, and controls the operation of the current value acquisition unit 15 and the operation of the alarm 17. The reference current waveform storage unit 16b stores a reference current waveform that represents the change over time in the current value of the drive current when the servo motor 13a is operating properly. The comparison and judgment unit 16a compares the current value sent from the receiving unit 15c, i.e., the drive current waveform representing the change over time in the current value of the drive current of the servo motor 13a acquired by the current value acquisition unit 15, with the reference current waveform stored in the reference current waveform memory unit 16b, and judges that there is a sign of a malfunction in the servo motor 13a if the degree of change in the drive current waveform relative to the reference current waveform exceeds a predetermined range. The alarm 17 is configured by a display of the control computer, an operation panel, or the like, and displays an alarm indicating that there is a sign of malfunction in the servo motor 13a based on the determination result of the comparison and determination unit 16a. Furthermore, the servo motor predictive maintenance device 14 may be provided with a drive current waveform display unit (not shown) that displays the drive current waveform acquired by the current value acquisition unit 15 on a display of the control computer, operation panel, etc., and a predetermined range setting unit (not shown) that sets the predetermined range, so that the predetermined range can be set by the predetermined range setting unit from the drive current waveform displayed on the drive current waveform display unit, etc.

[0026] FIG. 3 is a block diagram showing the configuration of another example of a servo motor predictive maintenance system and predictive maintenance device for an end seal cutting device. In the figure, 21 is a servo motor predictive maintenance system, 22 is a power supply, 23 is a servo mechanism, 23a is a servo motor, 23b is a servo amplifier, 23c is a controller, 24 is a servo motor predictive maintenance device, 25 is a current value acquisition unit, 25a is a transmission unit, 25b is a reception unit, 25c is a communication line, 26 is an arithmetic and control device, 26a is a position deviation judgment unit, and 27 is an alarm. As shown in FIG. 2, the servo motor predictive maintenance system 21 is made up of a power supply 22, a servo mechanism 23, and a servo motor predictive maintenance device 24. The power supply 22 is a commercial power supply that serves as the drive energy supply unit 2, similar to the power supply 12, and supplies a drive current to the servo mechanism 23 (servo motor 23a). The servo mechanism 23, like the servo mechanism 13, includes a servo motor 23a, which serves as the driving device 3, a servo amplifier 23b, and a controller 23c. In this servo mechanism 23, similar to the servo mechanism 13, the servo amplifier 23b controls the drive current supplied to the servo motor 23a based on a command (command signal) from the controller 23c, thereby controlling the position and speed of the servo motor and opening and closing the heater block (described later) of the end seal cutting device. The servo motor predictive maintenance device 24 is composed of a position deviation acquisition unit 25 which serves as the drive energy change acquisition unit 5, a calculation control unit 26 which serves as the predictive judgment unit 6, and an alarm 27 which serves as the judgment result output unit 7. The position deviation acquisition unit 25 includes a transmission unit 15a, a reception unit 15b, and a communication line 15c, and acquires a position deviation, which is a deviation in rotation from a command of the servo motor 13a. That is, in the servo mechanism 23, a command pulse from the positioning unit of the controller 23c is added to the deviation counter of the servo amplifier 23b, and at the same time, a feedback pulse from the encoder of the servo motor 23a is subtracted, causing a pulse accumulation (accumulation pulse) in the deviation counter, and this accumulation pulse represents a position deviation, which is a deviation in rotation from the command. In the position deviation acquisition unit 25, the transmitter 25a continuously acquires accumulated pulses (position deviation) accumulated in the deviation counter of the servo amplifier 23b and transmits them to the receiver 25b via the communication line 25c, and the receiver 25b sends the received accumulated pulses (position deviation) to the calculation control device 26. This position deviation acquiring unit 25 may be configured to extract accumulated pulses (position deviation) accumulated in a deviation counter of the servo amplifier 23b as an analog signal and send it to the arithmetic and control device 26 via a transmission line or the like, instead of being equipped with the transmitting unit 25a, receiving unit 25b, and communication line 25c shown in FIG. 3. Like the calculation control device 16, the calculation control device 26 is composed of a control computer that controls the operation of the horizontal pillow packaging machine, a calculation control unit of computer equipment such as a computer on the operation panel, a memory unit, etc., and is equipped with a position deviation determination unit 26a, which controls the operation of the position deviation acquisition unit 25 and the operation of the alarm 27. The position deviation determination unit 26a determines that there is a sign of malfunction in the servo motor 23a when the accumulated pulse (position deviation) sent from the receiving unit 25c, i.e., the accumulated pulse (position deviation), which is the deviation of rotation from the command of the servo motor 23a acquired by the position deviation acquisition unit 25, exceeds a predetermined range. The alarm 27 is configured by a display of the control computer, an operation panel, or the like, and displays an alarm indicating that there is a sign of malfunction in the servo motor 23a based on the determination result of the position deviation determination unit 26a.

[0027] [Air cylinder predictive maintenance system, predictive maintenance device configuration] Figure 4 is a block diagram showing the configuration of the air cylinder predictive maintenance system and predictive maintenance device for the end seal and cutting device. In the figure, 31 is an air cylinder predictive maintenance system, 32 is a compressor, 33 is an air cylinder operating mechanism, 33a is an air cylinder, 33a1 is a piston rod, 33a2 is a pressure chamber, 33a3 is an open chamber, 33b is a flow meter, 33c is a solenoid valve, 33d1 to 33d3 are piping, 34 is an air cylinder predictive maintenance device, 35 is a flow rate acquisition unit, 36 is a calculation and control device, 36a is an air leak determination unit, and 37 is an alarm piping. As shown in FIG. 4, the air cylinder predictive maintenance system 31 is composed of a compressor 32, an air cylinder operating mechanism 33, and an air cylinder predictive maintenance device . The compressor 32 serves as the driving energy supply unit 2, and supplies compressed air to the air cylinder operating mechanism 33 (air cylinder 33a). The air cylinder operating mechanism 33 includes an air cylinder 33a serving as the driving device 3, a flow meter 33b, a solenoid valve 33c, and pipes 33d1 to 33d3. In this air cylinder operating mechanism 33, compressed air supplied from compressor 32 and passed through flow meter 33b and piping 33d1 flows into pressure chamber 33a2 through piping 33d2 by solenoid valve 33c, and air in open chamber 33a3 is discharged from solenoid valve 33b through piping 33d3, which moves piston rod 33a1 and moves a cutting knife (described later), thereby performing the cutting operation of the cutting device (described later). The air cylinder predictive maintenance device 34 is composed of a flow rate acquisition unit 35 which serves as the drive energy change acquisition unit 5, a calculation control device 36 which serves as the predictive determination unit 6, and an alarm 37 which serves as the determination result output unit 7. When the air cylinder 23 is performing a cutting operation and the operation of the air cylinder 23 is stopped, the flow rate acquisition unit 35 acquires the flow rate (numerical value) of the compressed air flowing through the pipe 33d1 measured by the flow meter 33b as an analog signal as a leakage amount, and sends the analog signal of the acquired leakage amount (numerical value) of the compressed air to the arithmetic and control device 26 via a transmission line or the like. This flow rate acquiring unit 35 may be equipped with a transmitting unit, a receiving unit, and a communication line, like the current value acquiring unit 15 shown in Figure 2, and the transmitting unit acquires the compressed air flow rate (numerical value) measured by the flow meter 33b as a digital signal, transmits it to the receiving unit via the communication line, and the receiving unit sends the leakage amount (numerical value) to the arithmetic and control device 36 as a digital signal. The calculation and control device 36 is composed of a control computer that controls the operation of the horizontal pillow packaging machine, a calculation and control unit of computer equipment such as a computer on the operation panel, a memory unit, etc., and is equipped with an air leakage determination unit 36a and controls the operation of the flow rate acquisition unit 35 and the operation of the alarm 37. The air leakage determination unit 36a determines that there is a sign of malfunction in the air cylinder 33a when the amount (numerical value) of compressed air leakage acquired by the flow rate acquisition unit 35 exceeds a predetermined range. The alarm 37 is configured by a display of the control computer, an operation panel, or the like, and displays an alarm indicating that there is a sign of malfunction in the air cylinder 33a based on the determination result of the air leakage determination unit 36a. If a packaging machine uses multiple air cylinders, the pipes connected to each air cylinder branch off from the main pipe, and by installing a single flow meter in the middle of the main pipe rather than in the middle of the branch pipe, it is possible to measure air leakage from each air cylinder with this single flow meter.

[0028] [Configuration of heater predictive maintenance system and predictive maintenance device] FIG. 5 is a block diagram showing the configuration of an example of a heater predictive maintenance system and predictive maintenance device for an end seal and cutting device. In the figure, 41 is a heater predictive maintenance system, 42 is a power supply, 43 is a heater drive circuit, 43a is a cartridge heater, 43b is an ammeter, 43c is an SSR (solid state relay), 44 is a heater predictive maintenance device, 45 is a current value acquisition unit, 46 is an arithmetic and control device, 46a is a current value change determination unit, and 47 is an alarm. As shown in FIG. 5, a heater predictive maintenance system 41 includes a power supply 42, a heater drive circuit 43, and a heater predictive maintenance device 44. The power supply 32 is a commercial power supply that serves as the driving energy supply unit 2, and supplies a driving current to the heater driving circuit 43 (cartridge heater 43a). The heater driving circuit 43 includes a cartridge heater 43a serving as the driving device 3, an ammeter 43b, and an SSR 43c. In this heater drive circuit 43, the drive current supplied from the power supply 42 is turned on and off by an SSR 43c (a contactless relay using a semiconductor switching element), and when the SSR 43c is on, the drive current is supplied to the cartridge heater 43a, causing the cartridge heater 43a to generate heat, thereby raising the temperature of a heater block (described later) of the end seal / cutting device in which the cartridge heater 43a is embedded to the sealing temperature. At this time, the value of the current flowing through the cartridge heater 43a is measured by an ammeter 43b. The heater predictive maintenance device 44 is composed of a current value acquisition unit 45 which serves as the drive energy change acquisition unit 5, a calculation control unit 46 which serves as the predictive determination unit 6, and an alarm 47 which serves as the determination result output unit 7. The current value acquisition unit 45 continuously acquires the current value of the driving current supplied to the cartridge heater 43a measured by the ammeter 43b as an analog signal, and sends the analog signal of the acquired current value to the arithmetic and control device 46 via a transmission line or the like. This current value acquiring unit 45 may be equipped with a transmitting unit, a receiving unit, and a communication line like the current value acquiring unit 15 shown in Figure 2, in which the transmitting unit acquires the current value measured by the ammeter 43b as a digital signal, transmits it to the receiving unit via the communication line, and the receiving unit sends the current value to the arithmetic and control device 46 as a digital signal. The calculation control device 46 is composed of a control computer that controls the operation of the horizontal pillow packaging machine, a calculation control unit of computer equipment such as a computer on the operation panel, a memory unit, etc., and is equipped with a current value change determination unit 46a, which controls the operation of the current value acquisition unit 45 and the operation of the alarm 47. When the change in the current value acquired by the current value acquisition unit 45 exceeds a predetermined range, the current value change determination unit 46a outputs a determination that there is a sign of malfunction in the cartridge heater 43a. The alarm 47 is configured by a display of the control computer, an operation panel, or the like, and displays an alarm indicating that there is a sign of malfunction in the cartridge heater 43a based on the determination result of the current value change determination unit 46a.

[0029] FIG. 6 is a block diagram showing the configuration of another example of a heater predictive maintenance system and predictive maintenance device for an end seal and cutting device. In the figure, 51 is a heater predictive maintenance system, 52 is a power supply, 53 is a seal temperature control device, 53a is a cartridge heater, 53b is an ammeter, 53c is an SSR (solid state relay), 53d is a temperature sensor, 53e is a temperature regulator, 54 is a heater predictive maintenance device, 55 is a temperature acquisition unit, 56 is an arithmetic and control device, 56a is a temperature change determination unit, and 57 is an alarm. As shown in FIG. 6, a heater predictive maintenance system 51 includes a power supply 52, a seal temperature control device 53, and a heater predictive maintenance device . The power supply 52 is a commercial power supply that serves as the driving energy supply unit 2 and supplies a driving current to the cartridge heater 53 a of the seal temperature control device 53 . The seal temperature control device 53 includes a cartridge heater 53a serving as the driving device 3, an ammeter 53b, an SSR 53c, a temperature sensor 53d, and a temperature regulator 53e. In this seal temperature control device 53, the drive current supplied from the power supply 52 is turned on and off by the SSR 53c, and when the SSR 53c is on, the drive current is supplied to the cartridge heater 53a, causing the cartridge heater 53a to generate heat, thereby increasing the temperature of the heater block (described later) of the end seal cutting device in which the cartridge heater 53a is embedded. At this time, a temperature sensor 53d such as a thermocouple embedded in the heater block detects the temperature of the heater block and sends the detected temperature to a temperature regulator 53e. If the temperature from the temperature sensor 53d is lower than the sealing temperature, the temperature regulator 53e turns on the SSR 53c and supplies a drive current to the cartridge heater 43a. If the temperature from the temperature sensor 53d becomes higher than the sealing temperature, the temperature regulator 53e turns off the SSR 53c and stops the supply of drive current to the cartridge heater 53a. This keeps the temperature of the heater block at the sealing temperature. The heater predictive maintenance device 54 is composed of a temperature acquisition unit 55 which serves as the drive energy change acquisition unit 5, an arithmetic and control unit 56 which serves as the predictive judgment unit 6, and an alarm 57 which serves as the judgment result output unit 7. The temperature acquisition unit 55 continuously acquires the temperature of the heater block detected by the temperature sensor 53d as an analog signal, and sends the acquired analog signal of the temperature to the arithmetic and control device 56 via a transmission line or the like. This temperature acquisition unit 55 may be equipped with a transmitting unit, a receiving unit, and a communication line, like the current value acquisition unit 15 shown in Figure 2, and the transmitting unit may acquire the temperature detected by the temperature sensor 53d as a digital signal, transmit it to the receiving unit via the communication line, and the receiving unit may send the temperature as a digital signal to the arithmetic and control device 56. The calculation and control device 56 is composed of a control computer that controls the operation of the horizontal pillow packaging machine, a calculation and control unit of computer equipment such as a computer on the operation panel, a memory unit, etc., and is equipped with a temperature change determination unit 56a, which controls the operation of the temperature acquisition unit 55 and the operation of the alarm 57. When the change over time in the temperature acquired by the temperature acquisition unit 55 exceeds a predetermined range, the temperature change determination unit 56a outputs a determination that there is a sign of malfunction in the cartridge heater 53a. The alarm 57 is configured by a display of the control computer, an operation panel, or the like, and displays an alarm indicating that there is a sign of malfunction in the cartridge heater 53a based on the determination result of the temperature change determination unit 56a.

[0030] [End seal cutting device] An end sealing and cutting device for a horizontal pillow packaging machine equipped with servo motors 13a, 23a, an air cylinder 33a, and cartridge heaters 43a, 53a will be described. FIG. 7 is a perspective view showing the schematic configuration of the end seal cutting device, FIG. 8 is a left side view of the end seal cutting device, and FIG. 9 is a front view of the opening / closing toggle mechanism rotating portion. In the figure, 13d is a reducer, 43a1 (53a1) and 43a2 (53a2) are cartridge heaters, 60 is an end seal cutting device, 61 and 62 are heater blocks, 61a and 62a are central grooves, 61b and 62b are heater block holders, 61c is a guide hole, 63 is an open / close toggle mechanism, 63a is a rotating shaft, 63b is a rotating plate, 63c and 63d are driven arms, 63e and 63f are holding members, 64 is a holder drive block, 65a and 65b are support blocks, 65c and 65d are connecting plates, 66a and 66b are connecting rods, 67 is a cutting device, 67a is a support plate, 67b is a slider, 67c and 67d are guide rods, and 68 is a cutting knife. In the end seal and cutting device 60, central grooves 61a and 62a are provided in heater blocks 61 and 62 in which cartridge heaters 43a (43a1, 43a2), 53a (53a1, 53a2) are embedded, heater block 61 is attached to the underside of heater block holder 61b, heater block holder 61b is provided with guide hole 61c, heater block 62 is attached to the upper side of heater block holder 62b, and a holding member 63e is attached to the underside of heater block holder 62b. Heater block holder 61b is connected to holder drive block 64 by connecting rods 66a and 66b, heater block holder 62b is connected to holder drive block 64 via opening / closing toggle mechanism 63 and is slidably supported by connecting rods 66a and 66b, connecting rods 66a and 66b are slidably supported by support blocks 65a and 65b, support blocks 65a and 65b are connected by connecting plates 64c and 64d, and a holding member 63f is attached to the upper surface of holder drive block 64. In the opening / closing toggle mechanism 63, a rotating plate 63b is attached to a rotating shaft 63a, one ends of driven arms 63c and 63d are rotatably attached to both ends of the rotating arm 63b, the other end of the driven arm 63c is rotatably attached to a holding member 63e, and the other end of the driven arm 63d is rotatably attached to a holding member 63f, and the rotating shaft 63a is connected to a servo motor 13a (23a) for opening and closing the heater block via a reducer 13d. The cutting device 67 is composed of a support plate 67a, an air cylinder 33a attached to the upper surface of the support plate 67a, guide rods 67c and 67d attached to the lower surface of the support plate 67a, a slider 67b supported so as to be freely slidable on the guide rods 67c and 67d, and a cutting knife 68 attached to the slider 67b. The tip of the piston rod 33a1 of the air cylinder 33a is attached to the slider 67b, and the tips of the guide rods 67c and 67d are attached to the inner surface of the guide hole 61c of the heater block holder 61b.

[0031] In the end seal cutting device 60, when the rotary shaft 63a of the open / close toggle mechanism 63 is rotated by the servo motor 13a (23a) to rotate the rotary plate 63b, the heater block holder 62b moves along the connecting rods 66a, 66b via the driven arm 63c. At the same time, the holder drive block 64 moves via the driven arm 63d, and the connecting rods 66a, 66b move along the support blocks 65a, 65b, and the heater block holder 61b moves in the opposite direction to the heater block holder 62b. As a result, the heater block 61 and the heater block 62 are opened and closed (connected and separated). In addition, in the cutting device 67, by operating the air cylinder 33a, the slider 67b moves inside the guide hole 61c of the heater block holder 61b along the guide rods 67c and 67d via the piston rod 33a1, and the cutting knife 68 attached to the slider 67b moves. When heater block 61 and heater block 62 are closed, end seals are applied to the tubular continuous film (not shown) on which the center seal has been formed, and the air cylinder 33a of the cutting device 67 is activated, causing the cutting knife 67 to jump out of the central groove 61a of heater block 61 and enter the central groove 62b of heater block 62, cutting the tubular continuous film on which the end seal has been applied, thereby producing a package filled with the packaged product.

[0032] Next, we will explain the operation of the driving equipment predictive maintenance device 4 shown in Figure 1, the operation of the servo motor predictive maintenance devices 14 and 24 shown in Figures 2 and 3, the operation of the air cylinder predictive maintenance device 34 shown in Figure 4, and the operation of the heater predictive maintenance devices 44 and 54 shown in Figures 5 and 6. [Operation of drive unit predictive maintenance device 4] FIG. 10 is a flowchart showing the operation of the predictive maintenance device 4, and the operation of the predictive maintenance device 4 will be described below. First, when drive energy is supplied from the drive energy supply unit 2 to the drive machine 3 and the drive machine 3 is operating normally, the drive energy change acquisition unit 5 acquires the change in drive energy supplied to the drive machine 3 (S1). Next, the sign determining unit 6 determines whether or not there is a sign of malfunction in the movable machine 3 based on the change in the drive energy of the movable machine 3 acquired by the drive energy change acquiring unit 5 (S2). Next, the determination result output unit 7 outputs the determination result made by the sign determination unit 6 (S3). For example, if the sign determination unit 6 determines that the movable machine 3 has a sign of malfunction, the determination result output unit 7 outputs an alarm indicating that the movable machine 3 has a sign of malfunction as the determination result. Furthermore, if the sign determination unit 6 determines that there are no signs of malfunction in the movable machine 3, the determination result output unit 7 outputs nothing as the determination result, or outputs that there are no signs of malfunction in the movable machine 3.

[0033] [Operation of servo motor predictive maintenance device 14] FIG. 11 is a flowchart showing the operation of the servo motor predictive maintenance device 14, and the operation of the servo motor predictive maintenance device 14 will be described below. First, a drive current is supplied from the power supply 12 to the servo mechanism 13 (servo motor 13a), and while the servo motor 13a is operating normally, the current value acquisition unit 15 continuously acquires the current value of the drive current supplied to the servo motor 13a and sends the acquired current value to the calculation control device 16 (S11). Specifically, in the current value acquisition unit 15, the transmitter 15a continuously acquires the current value of the drive current supplied from the servo amplifier 13b to the servo motor 13a, transmits it to the receiver 15b via the communication line 15c, and sends the current value received by the receiver 15b to the calculation control device 16. Next, the comparison and judgment unit 16a of the calculation control device 16 compares the drive current waveform representing the temporal change in the current value of the drive current of the servo motor 13a acquired by the current value acquisition unit 15 with the reference current waveform stored in the reference current waveform memory unit 16b (S12). Then, the comparison and judgment unit 16a judges whether the degree of change of the drive current waveform relative to the reference current waveform exceeds a predetermined range (S13), and if it judges that it does, it judges that there are signs of a malfunction in the servo motor 13a (S14), and this judgment result is sent to the alarm 17, which displays an alarm indicating that there are signs of a malfunction (S15), and the processing ends. On the other hand, if the comparison and judgment unit 16a determines in step S13 that the degree of change in the drive current waveform relative to the reference current waveform does not exceed a predetermined range, it determines that there are no signs of malfunction in the servo motor 13a (S16), and terminates the processing without displaying a warning on the alarm 17.

[0034] Here, the reference current waveform stored in the reference current waveform storage unit 16b, the drive current waveform of the servo motor 13a acquired by the current value acquisition unit 15, and the determination method in the comparison and determination unit 16a will be described. Figure 12(a) is a graph showing the speed change when servo motor 13a opens and closes heater blocks 61 and 62 of end seal cutting device 60, and Figure 12(b) is a graph showing the change in the current value of the drive current supplied to servo motor 13a when servo motor 13a rotates at the speed change shown in Figure 12(a). The vertical axis of Figure 12(a) represents speed, the vertical axis of Figure 12(b) represents current value, and the horizontal axes of Figures 12(a) and 12(b) represent time. In the figures, ws represents the speed waveform and wa1 represents the reference current waveform. As shown in the speed waveform ws in Figure 12(a), from time t0 to t1, the servo motor 13a accelerates, rotates at a constant speed, and then decelerates to close the heater blocks 61 and 62, from time t1 to t2 it performs a sealing operation (an operation of pressing the heater blocks 61 and 62) without rotating, and from time t2 to t3 it accelerates, rotates at a constant speed, and then decelerates in the opposite direction to open the heater blocks 61 and 62. At this time, the change over time in the current value of the drive current supplied to the servo motor 13a is shown as the reference current waveform wa1 in Fig. 12(b). In this case, from time t1 to t2, the current value of the drive current is at its maximum even though the rotation speed of the servo motor 13a is 0. This is because the heater blocks 61 and 62 are pressed with a constant pressure to perform the sealing operation. The reference current waveform wa1 shown in Figure 12(b) shows the change in the current value of the drive current when there are no defects in equipment such as a reducer that operates by the rotation of the servo motor 13a, and the reference current waveform wa1 is stored in the reference current waveform memory unit 16b.

[0035] Figure 13(a) is a graph showing an example of a change in the current value (drive current waveform) acquired by the current value acquisition unit 15 when a defect occurs in the equipment operated by the rotation of the servo motor 13a, and Figure 13(b) is a graph showing a change in the current value difference, which is the difference between the current value shown in Figure 12(b) and the current value shown in Figure 13(a). The vertical axis of Figure 13(a) represents the current value, the vertical axis of Figure 13(b) represents the current value difference, and the horizontal axes of Figures 13(a) and (b) represent time. In the figures, wa2 represents the drive current waveform, fr1, fr2, and fr3 represent the waveform change section, and wd1, wd2, and wd3 represent the current value difference waveform. Even when the servo motor 13a is operating normally, if a defect such as wear of the gear head of the reducer 13d or lack of oil in the bearing occurs, the drive current waveform of the servo motor 13a will change from the reference current waveform wa1 to a drive current waveform wa2 in which the waveform changes at waveform change sections fr1, fr2, and fr3, as shown in Figure 13(a), for example. Then, by taking the difference between the reference current waveform wa1 and the drive current waveform wa2, the current value difference waveforms wd1, wd2, and wd3 shown in FIG. 13(b) are obtained. In step S13, the comparison / determination unit 16a determines whether the maximum value of any of the current value difference waveforms wd1, wd2, and wd3 exceeds a predetermined range of ±ds, and if so, determines that the servo motor 13a is malfunctioning (S14), and if not, determines that the servo motor 13a is not malfunctioning (S16). In FIG. 13(b), the maximum value of the current value difference waveform wd3 exceeds ds, so the comparison / determination unit 16a determines that the servo motor 13a is malfunctioning. In addition, the drive current waveform display unit may display the drive current waveform wa2 and current value difference waveforms wd1, wd2, and wd3 as shown in Figures 13(a) and 13(b), and the specified range setting unit may set a specified range ±ds. Even if the servo motor 13a is operating normally in this way, if a malfunction such as wear on the gear head of the reducer 13d or lack of oil in the bearing occurs, the drive current waveform wa2 will change relative to the reference current waveform wa1, and if the degree of change exceeds a predetermined range, it can be determined that there is a sign of malfunction in the servo motor 13a, and maintenance of the servo motor 13a can be carried out.

[0036] [Operation of servo motor predictive maintenance device 24] FIG. 14 is a flowchart showing the operation of the servo motor predictive maintenance device 24, and the operation of the servo motor predictive maintenance device 24 will be described below. First, a drive current is supplied from the power supply 22 to the servo mechanism 23 (servo motor 23a), and when the servo motor 23a is operating normally, the position deviation acquisition unit 25 acquires an accumulated pulse (position deviation) and sends the acquired accumulated pulse (position deviation) to the calculation control device 26 (S21). Specifically, in the position deviation acquisition unit 25, the transmitter 25a continuously acquires accumulated pulses (position deviation) accumulated in the deviation counter of the servo amplifier 23b and transmits them to the receiver 25b via the communication line 25c, and the receiver 25b sends the received accumulated pulses (position deviation) to the calculation control device 26. Next, the position deviation determination unit 26a of the arithmetic and control device 26 determines whether or not the accumulated pulse (position deviation) acquired by the position deviation acquisition unit 25 exceeds a predetermined range (S22), and if it is determined that it exceeds the predetermined range, it determines that there is a sign of malfunction in the servo motor 23a (S23), and this determination result is sent to the alarm 27, which displays an alarm indicating that there is a sign of malfunction (S24), and the processing ends. On the other hand, if the position deviation determination unit 26a determines in step S22 that the accumulated pulse (position deviation) does not exceed the predetermined range, it determines that there are no signs of malfunction in the servo motor 23a (S25), and ends the processing without displaying a warning on the alarm 27. In this way, the accumulated pulse (position deviation) acquired by the position deviation acquisition unit 25 represents the deviation of the rotation of the servo motor 23a from the command, and even when the servo motor 23a is operating normally, if a defect such as wear of the gear head of the reducer 13d or lack of oil in the bearing occurs, the accumulated pulse (position deviation) will become larger, and if the accumulated pulse (position deviation) exceeds a predetermined range, it is determined that there is a sign of a malfunction in the servo motor 23a, and maintenance of the servo motor 23a can be carried out.

[0037] [Operation of the air cylinder predictive maintenance device 34] FIG. 15 is a flowchart showing the operation of the air cylinder predictive maintenance device 34, and the operation of the air cylinder predictive maintenance device 34 will be described below. The air cylinder predictive maintenance device 34 functions when the cutting device 67 of the end seal cutting unit 60 is operated. First, in the air cylinder operating mechanism 33, the solenoid valve 33c is operated, and compressed air supplied from the compressor 32 via the flow meter 33b and piping 33d1 flows into the pressure chamber 33a2 of the air cylinder 33a via piping 33d2, and the air in the open chamber 33a3 is discharged from the solenoid valve 33b via piping 33d3, thereby moving the piston rod 33a1 and operating the cutting device 67, and then the movement of the piston rod 33a1 is stopped. In this state, the flow rate acquisition unit 35 acquires the flow rate of the compressed air flowing through the pipe 33d1 measured by the flow meter 33b as the leakage amount, and sends the acquired leakage amount of compressed air to the arithmetic and control device 36 (S31). In this case, if air leaks from pressure chamber 33a2, causing malfunction of air cylinder 33a, compressed air is supplied from compressor 32 to pressure chamber 33a2 via flow meter 33b and pipes 33d1 and 33d2 in an amount equal to the amount of air leaking from pressure chamber 33a2, and the flow rate of compressed air flowing into pressure chamber 33a2 is measured by flow meter 33b as the amount of leakage. Next, the air leakage determination unit 36a of the calculation and control device 36 determines whether the amount of compressed air leakage acquired by the flow rate acquisition unit 35 exceeds a predetermined range (for example, several milliliters / minute) (S32), and if it is determined that it does exceed the predetermined range, it determines that there are signs of a malfunction in the air cylinder 33a (S33), and this determination result is sent to the alarm 37, which displays an alarm indicating that there are signs of a malfunction (S34), and the processing ends. On the other hand, in step S32, if the air leakage determination unit 36a determines that the amount of compressed air leakage acquired by the flow rate acquisition unit 35 does not exceed the predetermined range, it determines that there are no signs of malfunction in the air cylinder 33a (S35), and ends the processing without displaying a warning on the alarm 37. In this way, even when the air cylinder 33a is operating normally, if even a small amount of air leaks from the pressure chamber 33a2, the amount of leakage can be measured by the flow meter 33b, and if the amount of leakage measured by the flow meter 33b and acquired by the flow rate acquisition unit 35 exceeds a predetermined range, it is determined that there is a sign of a malfunction in the air cylinder 33a, and the air cylinder 33a can be repaired.

[0038] [Operation of heater predictive maintenance device 44] FIG. 16 is a flowchart showing the operation of the heater predictive maintenance device 44, and the operation of the heater predictive maintenance device 44 will be described below. First, the heater drive circuit 43 In this step, a driving current is supplied from the power source 42 to the cartridge heater 43a via the SSR 43c and ammeter 43b, causing the cartridge heater 43a to generate heat and maintaining the heater blocks 61 and 62 at the sealing temperature. Then, the current value acquiring unit 45 continuously acquires the current value of the driving current supplied to the cartridge heater 43a measured by the ammeter 43b, and sends the acquired current value to the arithmetic and control device 46 (S41). In this case, when the cartridge heater 43a begins to deteriorate, the change in the current value of the drive current supplied to the cartridge heater 43a for maintaining the heater blocks 61 and 62 at the sealing temperature becomes large. Next, the current value change determination unit 46a of the calculation and control device 46 determines whether the change in the current value acquired by the current value acquisition unit 45 exceeds a predetermined range (for example, a few percent of the reference value) (S42), and if it is determined that it does exceed the predetermined range, it determines that there are signs of a malfunction in the cartridge heater 43a (S43), and this determination result is sent to the alarm 47, which displays an alarm indicating that there are signs of a malfunction (S44), and the processing ends. On the other hand, in step S42, if the current value change determination unit 46a determines that the change in the current value acquired by the current value acquisition unit 45 does not exceed the predetermined range, it determines that there are no signs of malfunction in the cartridge heater 43a (S45), and terminates the processing without displaying a warning on the alarm 47. Even if the heater blocks 61, 62 are maintained at the sealing temperature and the sealing operation is performed normally, if the cartridge heater 43a begins to deteriorate, the change in the current value of the drive current supplied to the cartridge heater 43a to maintain the heater blocks 61, 62 at the sealing temperature will become greater. Therefore, if the change in the current value of this drive current exceeds a predetermined range, it can be determined that there are signs of a malfunction in the cartridge heater 43a, and efforts can be made to preserve the cartridge heater 43a.

[0039] [Operation of heater predictive maintenance device 54] FIG. 17 is a flowchart showing the operation of the heater predictive maintenance device 54, and the operation of the heater predictive maintenance device 54 will be described below. First, in the sealing temperature control device 53, a driving current is supplied from the power source 52 to the cartridge heater 53a via the SSR 53c and ammeter 53b, causing the cartridge heater 53a to generate heat and raise the temperature of the heater blocks 61 and 62 to the sealing temperature. The temperature sensor 53d detects the temperature of the heater blocks 61 and 62, and the temperature regulator 53e controls the on / off supply of the driving current to the cartridge heater 53a to maintain the heater blocks 61 and 62 at the sealing temperature. Then, the temperature acquisition unit 55 continuously acquires the temperature of the heater block detected by the temperature sensor 53d, and sends the acquired temperature to the arithmetic and control device 56 (S51). In this case, when the cartridge heater 53a begins to deteriorate, the fluctuation (frequency of change) in the temperature of the heater blocks 61 and 62 increases, and the time required to reach the sealing temperature increases. Next, the temperature change determination unit 56a of the arithmetic and control device 56 determines whether the change in temperature acquired by the temperature acquisition unit 55 (for example, temperature fluctuation or the time it takes to reach the sealing temperature) exceeds a predetermined range (S52), and if it is determined that it does, it determines that there are signs of a malfunction in the cartridge heater 53a (S53), and this determination result is sent to the alarm 57, which displays an alarm indicating that there are signs of a malfunction (S54), and the processing ends. On the other hand, in step S52, if the temperature change determination unit 56a determines that the change in the current value acquired by the current value acquisition unit 45 does not exceed the predetermined range, it determines that there are no signs of malfunction in the cartridge heater 53a (S55), and terminates the processing without displaying a warning on the alarm 57. Even if the heater blocks 61, 62 are maintained at the sealing temperature and the sealing operation is performed normally in this way, if the cartridge heater 43a begins to deteriorate, the temperature fluctuations of the heater blocks 61, 62 will increase and it will take longer to reach the sealing temperature. Therefore, if the change in temperature of the heater blocks 61, 62 exceeds a predetermined range, it can be determined that there are signs of a malfunction in the cartridge heater 53a, and efforts can be made to preserve the cartridge heater 53a. [Industrial Applicability]

[0040] The predictive maintenance system and predictive maintenance method for driving equipment of the present invention can detect changes that indicate malfunctions due to deterioration or abnormalities in driving equipment used in packaging machines before such malfunctions occur, thereby maintaining the driving equipment, and can be used in horizontal pillow packaging machines, vertical pillow packaging machines, overwrap packaging machines, wrapping packaging machines, etc. [Explanation of symbols]

[0041] 1. Predictive maintenance system 2. Drive energy supply unit 3. Drive equipment 4. Predictive maintenance devices 5. Driving energy change detection section 6. Prediction determination section 7. Judgment result output section 11, 21 Servo motor predictive maintenance system 12, 22 Power supply 13, 23 Servo mechanism 13a, 23a servo motor 13b, 23b Servo amplifier 13c, 23c controller, 13d reducer 14, 24 Servo motor predictive maintenance device 15, 25 Current value acquisition section 15a, 25a transmitter 15b, 25b receiver 15c, 25c communication lines, 16, 26 Calculation and control device 16a, 26a Comparison / judgment section 16b, 26b Reference current waveform storage section 17, 27, 37, 47, 57 alarm 31 Air cylinder predictive maintenance system 32 Compressor 33 Air cylinder operating mechanism 33a Air cylinder 33a1 Piston rod 33a2 Pressure chamber 33a3 Open room 33b flow meter 33c Solenoid valve 33d1~33d3 Piping, 34 Air cylinder predictive maintenance device 35 Flow rate acquisition section 36 Arithmetic and control device 36a Air leak detector 41, 51 Heater predictive maintenance system 42, 52 Power supply 43 Heater drive circuit 43a, 43a1, 43a2, 53a, 53a1, 53a2 Cartridge heaters 43b, 53b ammeter 43c, 53c SSR 44, 54 Heater predictive maintenance device 45 Current value acquisition section 46, 56 Arithmetic and control device 46a Current value change determination unit 53 Seal temperature control device 53d Temperature Sensor 53e temperature controller 60 End seal cutting device 61, 62 Heater block 61a, 62a center groove 61b, 62b Heater block holder 61c Guide hole 63 Opening and closing toggle mechanism 63a Rotation axis 63b Rotating plate 63c, 63d Follower arms 63e, 63f Holding member 64 Holder drive block 65a, 65b Support blocks 65c, 65d connecting plate 66a, 66b Connecting rod 67 Cutting device 67a Support plate 67b slider 67c, 67d guide rod 68 Cutting Knife

Claims

1. A predictive maintenance device for a servo motor of a packaging machine, comprising: a current value acquiring means for continuously acquiring a current value of a drive current supplied to the servo motor when the servo motor is operating normally; a reference current waveform storage means for storing a reference current waveform representing a change over time in the current value of the drive current when no fault occurs in the device operated by the rotation of the servo motor; a comparison and determination means for comparing a drive current waveform, acquired by the current value acquisition means, which represents a change over time in the current value of the drive current of the servo motor, with the reference current waveform stored in the reference current waveform storage means, and determining that a malfunction has occurred in the operating device and that there is a sign of a malfunction in the servo motor when a value of a current value difference waveform obtained from the difference between the drive current waveform and the reference current waveform exceeds a predetermined range; a judgment result output means for outputting the judgment result of the comparison judgment means; A predictive maintenance device for a servo motor, comprising:

2. 2. A servo motor predictive maintenance device according to claim 1, further comprising: a drive current waveform display means for displaying the drive current waveform; and a predetermined range setting means for setting the predetermined range.

Images