JP2008004413A - Abnormality monitoring device of hydraulic operation mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality monitoring device of a hydraulic operation mechanism capable of detecting abnormality of the hydraulic operation mechanism at an early time and automatically without increasing monitoring frequencies by a monitoring personnel. <P>SOLUTION: This is the abnormality monitoring device 1 of the hydraulic operation mechanism to detect the abnormality of the hydraulic operation mechanism 10 which is provided with an operated part 12 operated by hydraulic pressure, an accumulator 13 which is a hydraulic pressure retaining means to retain the hydraulic pressure, and a hydraulic pressure supplying means 14 which is started up when the hydraulic pressure retained by the accumulator 13 is reduced lower than a prescribed pressure and which supplies the hydraulic pressure to the accumulator 13. This is provided with the number of start-up detecting means 31 to detect the number of start-up of a hydraulic pump 27 of the hydraulic pressure supplying means 14 and an abnormality detecting means 32 to determine existence of abnormality based on the starting-up times of the hydraulic pump 27 within a prescribed time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an abnormality monitoring device for a hydraulic operation mechanism.

  For example, a circuit breaker installed in a substation to interrupt an electric circuit is controlled by hydraulic pressure. When an abnormality occurs in the hydraulic system and the hydraulic pressure becomes lower than a predetermined pressure, the circuit breaker does not operate normally.

  For this reason, it is necessary for a supervisor to detect the presence or absence of an abnormality by monitoring the circuit breaker and the hydraulic system that operates the circuit breaker.

  On the other hand, substations are scattered throughout the country. Each substation has a number of circuit breakers. For this reason, the circuit breaker and the hydraulic system are monitored about once a month.

  Conventionally, when monitoring the circuit breaker and the hydraulic system, the presence / absence of an abnormality is determined based on the number of activations of a hydraulic pump that supplies hydraulic pressure to the hydraulic system.

For example, the hydraulic pump is started up usually once a day. Therefore, if the number of activations is about 30 times a month, it is determined to be normal, and if more than that, it is determined that there is a possibility of abnormality.
Japanese Patent Laid-Open No. 5-54760 JP-A-3-37925

  However, conventionally, since monitoring could be performed only once a month, there was a risk that discovery of an abnormality would be delayed.

  Increasing the monitoring frequency can detect anomalies at an early stage, but as mentioned above, a large number of circuit breakers are installed in the substation and the number of substations is large. There is a problem that the cost is increased.

  Such a problem is not limited to a circuit breaker installed in a substation, but is a problem common to hydraulic operation mechanisms operated by various hydraulic pressures.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide an abnormality monitoring device for a hydraulic operation mechanism that can quickly detect the presence or absence of an abnormality in the hydraulic operation mechanism without increasing the frequency of monitoring by a supervisor. .

The present invention employs the following means in order to solve the above problems.
That is, the present invention
An operated part operated by hydraulic pressure, a hydraulic pressure holding means for holding the hydraulic pressure, and activated when the hydraulic pressure held by the hydraulic pressure holding means falls below a predetermined pressure, An abnormality monitoring device for a hydraulic operation mechanism that detects an abnormality of a hydraulic operation mechanism that includes a hydraulic supply means for supplying
Activation number detection means for detecting the activation number of the hydraulic pressure supply means;
An abnormality detection means for detecting the presence or absence of an abnormality based on the number of activations of the hydraulic pressure supply means within a predetermined time;
It is characterized by providing.

  The operated part operated by the hydraulic pressure is configured to operate with the hydraulic pressure within a predetermined range. On the other hand, the operated part has an operating part and a fixed part, and a packing for sealing hydraulic pressure is provided between the operating part and the fixed part. The oil tight function such as packing may be deteriorated for some reason, and hydraulic oil may leak.

  If the hydraulic oil leaks, the hydraulic pressure may decrease and the operated part may not be operated. For this reason, when the hydraulic pressure of the hydraulic pressure holding means drops below a predetermined pressure, the hydraulic pressure supply means is activated and the hydraulic pressure is supplied to the hydraulic pressure holding means.

  When there is a lot of hydraulic oil leakage, the number of times of starting the hydraulic pressure supply means increases. Therefore, the present invention is configured to automatically detect an abnormality in the hydraulic system based on the number of activations of the hydraulic pressure supply means within a predetermined time.

  For example, if the number of activations of the hydraulic pressure supply means within a predetermined time is greater than the predetermined number, it can be determined that there is some abnormality such as leakage of hydraulic oil. Thereby, abnormality can be detected at an early stage without increasing the monitoring frequency by the supervisor.

  Here, the predetermined time can be a predetermined time after the operation of the hydraulic pressure supply unit is stopped.

  Further, the abnormality detection means can be configured to detect the presence or absence of an abnormality based on an operation time required for the hydraulic pressure to rise to a predetermined pressure after the hydraulic pressure supply means is activated. According to this configuration, an abnormality in the hydraulic pressure supply unit or the hydraulic pressure holding unit can be detected at an early stage.

  The hydraulic pressure supply means can be exemplified by a hydraulic pump, and the hydraulic pressure holding means can be exemplified by an accumulator.

  Examples of the operated part include a circuit breaker that interrupts an electric circuit and a hydraulic control means that controls the circuit breaker.

  It is preferable to further include alarm generation means for generating an alarm when an abnormality is detected by the abnormality detection means. Examples of means for generating the alarm include an LED (light emitting diode) and a speaker.

  According to the present invention, an abnormality is detected based on the number of activations of the hydraulic pressure supply means within a predetermined time, so that an abnormality of the hydraulic operation mechanism can be detected early and automatically without increasing the monitoring frequency by the supervisor.

  Hereinafter, an abnormality monitoring device for a hydraulic operation mechanism according to the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings. In addition, the structure of the following embodiment is an illustration and this invention is not limited to the structure of embodiment.

<Device overview>
FIG. 1 shows an abnormality monitoring apparatus 1 for a hydraulic operation mechanism according to an embodiment of the present invention. The abnormality monitoring device 1 of the hydraulic operation mechanism detects an abnormality of the hydraulic operation mechanism 10.

  The hydraulic operation mechanism 10 is activated when the operated portion 12 is operated by hydraulic pressure, the accumulator 13 is a hydraulic pressure holding means for holding the hydraulic pressure, and the hydraulic pressure held by the accumulator 13 drops below a predetermined pressure. And an oil pressure supply means 14 for supplying oil pressure to the accumulator 13.

  The operated unit 12 connects or disconnects the hydraulic control unit 23 that regulates the flow of the hydraulic oil 25, the piston 20 that is slid by the hydraulic control unit 23, and the electric paths 21 and 21 by the sliding movement of the piston 20. Circuit breaker 22.

  The accumulator 13 has a bladder (not shown) in which a gas is sealed, and holds the hydraulic pressure at a predetermined pressure by utilizing the expansion and compression of the gas. Since the accumulator 13 can use a general thing, the detailed description is abbreviate | omitted.

  The hydraulic pressure supply means 14 includes a tank 26 that accumulates the hydraulic oil 25, a hydraulic pump 27 that sucks the hydraulic oil 25 in the tank 26 and supplies the hydraulic oil 25 to the accumulator 13, and a motor 28 that drives the hydraulic pump 27. is doing.

  A pipe 29 connecting the hydraulic pump 27 and the accumulator 13 is provided with a pressure measuring device 30 for measuring the hydraulic pressure. The output of the pressure measuring device 30 is supplied to the abnormality monitoring device 1.

  The abnormality monitoring device 1 detects the number of activations of the hydraulic pump 27, and detects the abnormality of the hydraulic operation mechanism 10 based on the number of activations detected by the activation number detection unit 31. Means 32.

  The activation number detection means 31 detects the number of activations of the hydraulic pump 27 by, for example, detecting the opening / closing of a state contact of an electromagnetic switch that turns the motor 28 ON / OFF. The output of the activation number detection means 31 is sent to the abnormality detection means 32.

  The abnormality detection unit 32 measures a predetermined time set in advance by a timer, for example, and determines whether there is an abnormality based on the number of times the hydraulic pump 27 is activated within the predetermined time. The abnormality monitoring device 1 can be configured by, for example, a microcomputer.

  In the present embodiment, a plurality of modes indicating the number of activations N per day, such as the 15 times a day mode and the 10 times a day mode, are registered in the abnormality monitoring device 1. These modes can be switched freely.

  For example, when the 15 times a day mode is set, 96 minutes (24 hours × 60 minutes ÷ 15 times = 96 minutes / once) is set as the predetermined time. Actually, since the hydraulic pump 27 is activated only once a day, if the predetermined time is 96 minutes, the hydraulic pump 27 is set to a safer side.

  In this case, after the hydraulic pump 27 is operated and stopped, it is determined that there is no abnormality when the activation of the hydraulic pump 27 for 96 minutes is zero. On the other hand, when the hydraulic pump 27 is started at least once in 96 minutes, it is determined that there is an abnormality. The predetermined time can be changed freely.

Further, the abnormality monitoring device 1 detects the presence or absence of abnormality based on the operation (operation) time of the hydraulic pump 27 required for the hydraulic pressure to rise to a predetermined pressure from the time of starting the hydraulic pump 27.

  For example, when foreign matter (such as jelly-like hydraulic oil) is clogged in the suction port of the hydraulic pump 27, the performance of the hydraulic pump 27 for sucking the hydraulic oil 25 decreases. For this reason, the operation time required to increase from the start of the hydraulic pump 27 to a predetermined hydraulic pressure is longer than that in the normal state. Further, it is conceivable that the operation time of the hydraulic pump 27 becomes longer than usual due to other reasons.

  Therefore, in the present embodiment, when the operation time required for the hydraulic pressure to rise to 33.5 MPa, which is a predetermined pressure, from the start of the hydraulic pump 27 exceeds a predetermined time, for example, 80 seconds, the hydraulic pressure supply including the hydraulic pump 27 is provided. It is determined that the means 14 is abnormal. The predetermined time can be freely changed.

  The operating time of the circuit breaker 22 is detected by appropriate detection means (not shown), and the detection result is input to the abnormality detection means 32.

  FIG. 2 shows an example of setting the hydraulic pressure in the hydraulic operation mechanism 10 of the present embodiment. In the present embodiment, the oil pressure lowering alarm pressure for generating an alarm is set to 27.5 MPa. Further, the starting pressure (pump operating pressure) at which the hydraulic pump 27 starts is set to 31.5 MPa, and the stop pressure is set to 33.5 MPa. That is, a pressure of 31.5 MPa to 33.5 MPa is determined as a normal hydraulic pressure.

  As described above, an alarm is generated when the pressure drops to 27.5 MPa, but in the present invention, the abnormality monitoring device 1 is configured to detect an abnormality before the alarm is generated.

  Moreover, the open circuit locking pressure of the circuit breaker 22 is set to 25.5 MPa, and the closed circuit locking pressure is set to 27 MPa. When the hydraulic pressure reaches 38 MPa, a relief valve (not shown) in the hydraulic operation mechanism 10 is opened and the hydraulic oil 35 is discharged.

  3 to 8 show the relationship between the operation of each unit and the generation timing of various signals. As shown in FIG. 3, after the hydraulic pump 27 is operated and stopped, it is normal if the hydraulic pump 27 does not start for 96 minutes or more of the timer set time (predetermined time) and no circuit breaker operation signal is generated. ). In this case, the timer is reset.

  Also, as shown in FIG. 4, after the hydraulic pump 27 is activated and stopped, the hydraulic pump 27 is activated within 96 minutes of the timer set time (predetermined time), and no circuit breaker operation signal is generated. Is determined and an alarm is generated. In this case, the timer is not reset.

  As shown in FIG. 5, when the circuit breaker operation signal is generated within 96 minutes after the hydraulic pump 27 is operated and stopped, the timer is reset without generating an alarm. In this case, the circuit breaker 22 operates and hydraulic pressure is consumed. Along with this, the hydraulic pump 27 is activated and the hydraulic pressure is supplied to the accumulator 13. Therefore, in this case, it is determined as normal.

  Also, as shown in FIG. 6, when the circuit breaker 22 operates, the hydraulic pressure is consumed, so the hydraulic pump 27 is activated. For this reason, when the hydraulic pump 27 is started after the operation of the circuit breaker 22, the number of activations is not counted, and the counter is reset.

  Also, as shown in FIG. 7, when a circuit breaker signal is generated while the hydraulic pump 27 is operating, the number of activations in that operation is not counted and the counter is reset.

As shown in FIG. 8, the operating time of the hydraulic pump 27, the subsequent stop time, and the like are displayed on the hydraulic P start time liquid crystal unit 38 (see FIG. 9), which is a liquid crystal display, for example.

  FIG. 9 shows a control panel 35 provided in the abnormality monitoring device 1 of the hydraulic operation mechanism. The control panel 35 includes a display return button 36 for returning the liquid crystal display, a liquid crystal unit backlight switch 37 for turning on the backlight of the liquid crystal display, a hydraulic P start time liquid crystal unit 38 for displaying the start time of the hydraulic pump 27, and the like. A mode selection button 39, an alarm LED 40 for generating an alarm, a mode selection LED 41 indicating the selected mode, and the like are provided.

<Processing flow>
FIG. 10 shows a processing flow of the abnormality monitoring device 1 of this hydraulic operation mechanism. Here, first, mode selection is performed (S1).

  Next, when the hydraulic pump 27 is activated, a timer is activated at the same time, and a predetermined time is set (S2). In this embodiment, the timer is set to 96 minutes.

  Next, it is determined whether or not the circuit breaker 22 has operated within a predetermined time (S3). Here, if it is determined that the circuit breaker 22 has been operated, the timer is then reset (S5). Next, the process after step (S2) is performed.

  If it is determined in step (S4) that the circuit breaker 22 is not operating, it is next determined whether or not the hydraulic pump 27 has been activated within the set time (96 minutes) of the timer (S6). ).

  If it is determined in step (S6) that the hydraulic pump 27 has been activated within a predetermined time, then an “abnormal” alarm is issued (S7).

  If it is determined in step (S6) that the hydraulic pump 27 has not been activated within a predetermined time, then the processing from step (S5) onward is performed.

  On the other hand, when the hydraulic pump 27 is started in step (S2), the timer is started in step (S3) and at the same time the operation time of the hydraulic pump 27 is measured (S8).

  Next, it is determined whether or not the operation time of the hydraulic pump 27 exceeds 80 seconds (predetermined time) (S9). Here, if it is determined that the operation time of the hydraulic pump 27 exceeds 80 seconds, it is next determined whether or not the circuit breaker 22 has been operated (S10).

  If it is determined in step (S10) that the circuit breaker 22 has been operated, then the processing from step (S2) onward is performed.

  If it is determined in step (S10) that the circuit breaker 22 is not operating, then an "abnormal" alarm is issued in step (S7).

  If it is determined in step (S9) that the operation time of the hydraulic pump 27 is 80 seconds or less, then the processing in step (S2) and subsequent steps is performed.

  As described above, according to the abnormality monitoring device 1 for a hydraulic operation mechanism of the present invention, an abnormality is automatically detected based on the number of times the hydraulic pump 27 of the hydraulic supply means 14 is activated within a predetermined time such as 96 minutes. Abnormalities can be detected at an early stage without increasing the number of times the hydraulic operating mechanism 10 is monitored by the monitoring personnel.

  In the above embodiment, the abnormality detection means 32 has the number of times that the hydraulic pump 27 is activated within a predetermined time of, for example, about 96 minutes, and the operation time required for the hydraulic pump 27 to increase from the activation to the predetermined hydraulic pressure. However, the abnormality can be detected based only on the number of times the hydraulic pump 27 is activated within a predetermined time.

  Further, in the above embodiment, whether or not there is an abnormality is determined by detecting whether or not the hydraulic pump 27 is activated within a predetermined time immediately after the hydraulic pump 27 stops operating, but after the hydraulic pump 27 stops operating, Next, it can be determined whether or not there is an abnormality by detecting whether or not the hydraulic pump 27 is activated within a predetermined time that can be taken until the hydraulic pump 27 is activated.

  For example, if the predetermined time is 96 minutes, and it is assumed that several hours have passed after the hydraulic pump 27 has stopped operating until the next time the hydraulic pump 27 is started, the next hydraulic pump 27 will stop after the hydraulic pump 27 stops operating. Since 96 minutes of the predetermined time can be counted continuously several times before starting, it is detected whether or not the hydraulic pump 27 starts every time 96 minutes pass after the hydraulic pump 27 stops operating, It can be determined whether or not there is an abnormality each time.

It is a figure which shows the abnormality monitoring apparatus of the hydraulic operation mechanism which concerns on embodiment of this invention. It is a figure which shows the example of a setting of the hydraulic pressure which concerns on embodiment of this invention. It is a figure which shows the operation | movement of each part in the normal time which concerns on embodiment of this invention, and the generation timing of various signals. It is a figure which shows the operation | movement of each part and the generation timing of various signals when a pump operate | moves within the predetermined time which concerns on embodiment of this invention. It is a figure which shows the operation | movement of each part and the generation timing of various signals when a timer is reset for the circuit breaker operation | movement which concerns on embodiment of this invention. It is a figure which shows the operation | movement of each part when the frequency | count of pump operation by the circuit breaker operation | movement which concerns on embodiment of this invention is canceled, and the generation timing of various signals. It is a figure which shows the operation | movement of each part and generation | occurrence | production timing of various signals when a circuit breaker operate | moves during the hydraulic pump which concerns on embodiment of this invention. It is a figure which shows the example of a display of the liquid crystal display part which concerns on embodiment of this invention. It is a figure which shows the control panel which concerns on embodiment of this invention. It is a flowchart which shows the processing flow which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Abnormality monitoring apparatus 10 Hydraulic operation mechanism 12 Operated part 13 Accumulator (hydraulic holding means)
DESCRIPTION OF SYMBOLS 14 Oil pressure supply means 20 Piston 21 Electric circuit 22 Circuit breaker 25 Hydraulic oil 26 Tank 27 Hydraulic pump 28 Motor 29 Piping 30 Pressure measuring device 31 Start frequency detection means 32 Abnormality detection means 35 Control panel 36 Display return button 37 Liquid crystal part backlight switch 38 Oil pressure P start time liquid crystal part 39 Mode selection button 40 Alarm LED
41 Mode selection LED

Claims (6)

An operated part operated by hydraulic pressure, a hydraulic pressure holding means for holding the hydraulic pressure, and activated when the hydraulic pressure held by the hydraulic pressure holding means falls below a predetermined pressure, An abnormality monitoring device for a hydraulic operation mechanism that detects an abnormality of a hydraulic operation mechanism that includes a hydraulic supply means for supplying
Activation number detection means for detecting the activation number of the hydraulic pressure supply means;
An abnormality detection means for detecting the presence or absence of an abnormality based on the number of activations of the hydraulic pressure supply means within a predetermined time;
An abnormality monitoring device for a hydraulic operation mechanism, comprising:   2. The abnormality monitoring device for a hydraulic operation mechanism according to claim 1, wherein the predetermined time is a predetermined time after the operation of the hydraulic pressure supply unit is stopped.   3. The abnormality detection unit according to claim 1, wherein the abnormality detection unit further detects presence / absence of an abnormality based on an operation time required for the hydraulic pressure to increase to a predetermined pressure after activation of the hydraulic pressure supply unit. Abnormality monitoring device for hydraulic operating mechanism.   4. The abnormality monitoring apparatus for a hydraulic operation mechanism according to claim 1, wherein the hydraulic pressure supply unit includes a hydraulic pump, and the hydraulic pressure holding unit includes an accumulator.   5. The abnormality monitoring device for a hydraulic operation mechanism according to claim 1, wherein the operated part includes a circuit breaker that interrupts an electric circuit, and a hydraulic control unit that controls the circuit breaker.   6. The abnormality monitoring device for a hydraulic operation mechanism according to claim 1, further comprising alarm generation means for generating an alarm when an abnormality is detected by the abnormality detection means.

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