JP2018109269A - Monitoring system for foreign matter removal device, foreign matter removal system, and method for monitoring foreign matter removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system for a foreign matter removal device, a foreign matter removal system, and a method for monitoring the foreign matter removal device.SOLUTION: A monitoring system for a foreign matter removal device is arranged in the foreign matter removal device 2 that comprises a generator 21 for producing compressed gas, a retainer 22 for internally retaining the produced compressed gas, and an injector 23 for removing foreign matter from a track branch section by emitting a jet of the retained compressed gas. The monitoring system includes pressure detection means 32 for detecting pressure within the retainer, and failure omen determination means 31 for determining the presence or absence of an omen of a failure in the foreign matter removal device on the basis of the detected pressure within the retainer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a monitoring system for a foreign substance removing device, a foreign substance removing system, and a monitoring method for the foreign substance removing device.

  Conventionally, in order to avoid the inversion of the track branching part that causes a delay in railway operation, a foreign object removal device has been proposed that blows away foreign objects such as ice and snow interposed between the basic rail and the Tongrel by injection of compressed air. Yes. For example, Patent Literature 1 discloses a foreign matter removal system including a control center that can change the operation mode of a plurality of foreign matter removal devices based on the operation status of a train.

WO2015 / 049879A1

  However, when the foreign matter removing device breaks down, the foreign matter at the track branching portion cannot be removed properly, which causes non-conversion of the track branching portion and delays the railway operation. For this reason, it is required to detect and deal with the failure of the foreign substance removing device at an early stage.

  However, in the past, the actual situation was that the failure of the foreign matter removing apparatus could be detected only by detecting the occurrence of non-conversion of the track branching portion.

  The present invention has been made in consideration of such points, and provides a foreign matter removing apparatus monitoring system, a foreign matter removing system, and a foreign matter removing apparatus monitoring method capable of detecting a failure of the foreign matter removing apparatus at an early stage. The purpose is to do.

  The present invention relates to a generator for generating compressed gas, a holder for holding the generated compressed gas inside, and an injector for injecting the held compressed gas to remove foreign substances present in a track branching portion. And a pressure detection means for detecting the pressure inside the cage, and determining whether there is a sign of failure of the foreign matter removal device based on the detected pressure inside the cage. A foreign matter removing apparatus monitoring system comprising a failure sign determination unit.

  In the monitoring system according to the present invention, the failure sign determination means includes a post-injection cage corresponding to a pressure inside the cage detected after the injection and a pressure inside the cage detected before the injection. Based on the comparison between the first upper limit value and the first lower limit value of the internal pressure, the presence / absence of the failure sign may be determined.

  In the monitoring system according to the present invention, it comprises failure determination means for determining the presence or absence of a failure of the foreign substance removal device based on the detected pressure inside the cage, wherein the failure determination means is the holding detected after the injection. Based on the comparison between the second upper limit value and the second lower limit value of the pressure inside the cage after the injection corresponding to the pressure inside the cage detected before the injection, The presence or absence of the failure may be determined.

  In the monitoring system according to the present invention, the failure sign determination means may detect the failure based on a pressure difference between the pressure inside the cage detected before the injection and the pressure inside the cage detected after the injection. You may determine the presence or absence of a precursor.

  In the monitoring system according to the present invention, the failure sign determination means may determine the presence or absence of the failure sign based on the pressure inside the cage detected after the injection.

  In the monitoring system according to the present invention, the failure sign determination means may determine the presence or absence of the failure sign based on a change amount of the detected internal pressure of the cage in a predetermined time.

  In the monitoring system according to the present invention, the failure sign determination unit does not have to determine that the failure sign is present when the foreign matter removal apparatus is in a predetermined state when the change amount is acquired. Good.

  In the monitoring system according to the present invention, the predetermined state may include at least one of the predetermined time after the operation of the generator, when the ambient temperature of the generator decreases, and when the ambient temperature of the generator decreases.

  The monitoring system according to the present invention may further comprise an alarm output means for outputting an alarm when it is determined that there is a sign of the failure.

  The monitoring system according to the present invention may further include an inspection unit that inspects whether there is a failure in the foreign matter removing device based on a change amount of the pressure inside the cage after the injection.

  The present invention includes a generator that generates compressed gas, a holder that holds the generated compressed gas therein, an injector that injects the held compressed gas to remove foreign matter from the orbital branching portion, A foreign matter removing apparatus having pressure detection means for detecting the pressure inside the cage, and a sign of failure of the foreign matter removing apparatus based on the detected pressure inside the cage. A foreign matter removal system comprising a monitoring system having a failure sign determination means for determining presence or absence.

  The present invention includes a generator that generates compressed gas, a holder that holds the generated compressed gas therein, an injector that injects the held compressed gas to remove foreign matter from the orbital branching portion, In the foreign matter removing apparatus having the above, a foreign matter removing device monitoring method for detecting a pressure inside the cage and determining whether there is a sign of failure of the foreign matter removing device based on the detected pressure inside the cage. is there.

  According to the present invention, it is possible to detect a failure of the foreign matter removing apparatus at an early stage.

It is a figure which shows the foreign material removal system by this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by this embodiment. It is explanatory drawing for demonstrating failure sign determination of a foreign material removal apparatus in the operation example of the foreign material removal system by this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 1st modification of this embodiment. It is a time chart which shows the operation example of the foreign material removal system by the 1st modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 2nd modification of this embodiment. It is a figure which shows the foreign material removal system by the 3rd modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 4th modification of this embodiment. It is a figure which shows the foreign material removal system by the 5th modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 5th modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 6th modification of this embodiment. It is a figure which shows the foreign material removal system by the 7th modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 7th modification of this embodiment. It is a figure which shows the foreign material removal system by the 8th modification of this embodiment. It is a flowchart which shows the operation example of the foreign material removal system by the 8th modification of this embodiment.

  Hereinafter, a monitoring system for a foreign substance removal apparatus, a foreign substance removal system, and a monitoring method for a foreign substance removal apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, embodiment shown below is an example of embodiment of this invention, This invention is limited to these embodiment, and is not interpreted. In the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same or similar reference numerals, and repeated description thereof is omitted. In addition, the dimensional ratio in the drawing may be different from the actual ratio for convenience of description, and a part of the configuration may be omitted from the drawing.

  FIG. 1 is a diagram illustrating a foreign matter removal system 1 according to the present embodiment. As shown in FIG. 1, the foreign matter removal system 1 includes a foreign matter removal device 2 and a monitoring system 3.

(Foreign substance removal device 2)
The foreign matter removing device 2 is disposed at the track branching portion of the railway track, and removes foreign matters such as ice and snow that are interposed between the basic rail 7 and the Tongrel 8 constituting the point 6 of the branching device by jetting compressed air 10. Is. The railroad track is, for example, a Shinkansen track. The Shinkansen line may be either a Japanese Shinkansen standard (that is, full standard) line or a mini Shinkansen line that allows direct operation with the Shinkansen line after changing the existing conventional line. . Further, the railway track may be a dedicated track for conventional lines. Further, the railroad track is not limited to Japan, but may be a railroad track around the world (for example, a high-speed railroad or a conventional railroad track).

  As shown in FIG. 1, the foreign matter removing apparatus 2 includes a compressor 21 that is an example of a generator, a tank 22 that is an example of a cage, and a nozzle 23 that is an example of an injector. The compressor 21 generates compressed air that is an example of compressed gas. The tank 22 holds the compressed air generated by the compressor 21 inside. The nozzle 23 injects compressed air held in the tank 22 to remove foreign matter from the track branching portion.

  As shown in FIG. 1, the foreign matter removing device 2 includes a pipe 24 that communicates the compressor 21, the tank 22, and the nozzle 23, and an electromagnetic valve 25 that is disposed on the pipe 24 between the tank 22 and the nozzle 23. Have Further, the foreign matter removing apparatus 2 has a control unit 31 that controls the compressor 21 and the electromagnetic valve 25. The control unit 31 also operates as a failure sign determination unit and an alarm output unit of the monitoring system 3 described later. . Further, as shown in FIG. 1, the compressor 21, the tank 22, the electromagnetic valve 25, the control unit 31, and a part of the piping 24 are installed inside the machine room 20.

  More specifically, as shown in FIG. 1, the compressor 21 has a compressor motor 211 inside. A compressor control signal that commands rotation of the compressor motor 211 is input to the compressor 21 from the control unit 31. When the compressor control signal is input, the compressor motor 211 rotates. The compressor motor 211 may rotate based on a pressure detection signal from the pressure sensor 32 described later. Compressed air is generated in the compressor 21 as the compressor motor 211 rotates. The compressor 21 may be configured to generate compressed air by converting the rotation of the compressor motor 211 into the reciprocating motion of the piston in the cylinder, but is not limited to such a configuration. The compressed air generated in the compressor 21 flows into the tank 22 through the pipe 24 and is held in the tank 22.

  Further, an electromagnetic valve control signal for instructing opening of the electromagnetic valve 25 is input from the control unit 31 to the electromagnetic valve 25. The solenoid valve 25 is opened by inputting the solenoid valve control signal. With the electromagnetic valve 25 opened, the compressed air held in the tank 22 reaches the nozzle 23 through the pipe 24. The compressed air that has reached the nozzle 23 is jetted between the basic rail 7 and the tongrel 8 from the nozzle 23. By injecting the compressed air, it is possible to remove foreign matters interposed between the basic rail 7 and the tongrel 8.

  In the example of FIG. 1, a plurality of nozzles 23 are arranged on the inner walls of the two basic rails 7 included in each of the two lines running in parallel with an interval in the longitudinal direction of the lines. In addition, four electromagnetic valves 25 are arranged in the same number as the total number of the basic rails 7 of the two lines. The plurality of nozzles 23 arranged on the common basic rail 7 are communicated with a common electromagnetic valve 25 via a pipe 24.

  In the example of FIG. 1, the control unit 31 receives an injection signal that commands the injection of compressed air from the host device 4. The host device 4 may be, for example, an information device or an information terminal installed at a station. In response to the input of the injection signal, the control unit 31 outputs a compressor control signal for instructing rotation of the compressor motor 211 to the compressor motor 211, and outputs an electromagnetic valve control signal for instructing opening of the electromagnetic valve 25 to the electromagnetic valve 25. To do.

  In the example of FIG. 1, the injection signals are four types of signals: a train passage signal, a localization state signal, an inversion state signal, and a retry signal.

  The train passing signal is a signal output from the ATC (Automatic Train Control) 12 to the host device 4 when the train passes through the track. When the train passes, the train vibrates at the point 6, so that foreign matters such as ice and snow adhering to around the train wheel and under the floor may fall between the basic rail 7 and the tongrel 8. The control unit 31 performs control to inject compressed air using a train passage signal as a trigger, thereby quickly removing foreign matters that have fallen between the basic rail 7 and the tongrel 8 when the train passes. it can.

  The localization state signal is a signal that is output from the switch 13 to the host device 4 when the point 6 is converted from the inverted position to the localized position by the switch 13 that converts the point 6. The localization is a state of the point 6 at which the train enters the normal direction, that is, the main line. Inversion is the state of point 6 that causes the train to enter a different direction, that is, the main line. The localization state signal may be, for example, a signal output from a sensor that detects a current supplied to a motor that is a power source of the switch 13.

  The inversion state signal is a signal that is output from the switch 13 to the host device 4 when the point 6 is converted from the localization to the inversion by the switch 13.

  The retry signal is output from the switch 13 to the host device 4 when the conversion failure of the point 6 occurs, and when the switch 13 starts the reconversion, that is, the inversion of the point 6 for the retry. Signal.

  In addition to the above four types of injection signals, the control unit 31 receives an injection command signal by remote operation from a monitoring terminal 33 described later, and performs control to inject compressed air in response to reception of the injection command signal. May be. Moreover, the control part 31 may transmit the in-injection signal which shows that compressed air is injecting to the monitoring terminal 33, when performing control which injects compressed air.

(Monitoring system 3)
The monitoring system 3 is a system that can monitor the operating state of the foreign matter removing apparatus 2 and determine whether there is a sign of a failure of the foreign matter removing apparatus 2. As shown in FIG. 1, the monitoring system 3 includes a pressure sensor 32 that is an example of a pressure detection unit, the control unit 31 that is an example of a failure sign determination unit, and a monitoring terminal 33.

  The pressure sensor 32 is disposed in the tank 22 of the foreign matter removing apparatus 2. The pressure sensor 32 detects the pressure inside the tank 22 (hereinafter also referred to as tank pressure), and outputs a pressure detection signal indicating the detected tank pressure to the control unit 31.

  The control unit 31 is a control device such as a PLC (programmable logic controller). The control unit 31 determines whether or not there is a sign of failure of the foreign matter removing apparatus 2 based on the pressure detection signal input from the pressure sensor 32, that is, the detected tank pressure.

  Specifically, the control unit 31 sets a tank pressure before the injection of compressed air (hereinafter also referred to as a tank pressure before injection) and a tank pressure after the injection of compressed air (hereinafter also referred to as a tank pressure after injection). Detect each. Then, the control unit 31 removes the foreign matter based on the comparison between the detected post-injection tank pressure and the upper limit value and the lower limit value of the post-injection tank pressure set in advance corresponding to the detected pre-injection tank pressure. The presence / absence of a failure sign of the apparatus 2 is determined (hereinafter also referred to as a failure sign determination). Such a configuration is also an example in which a failure sign determination is performed based on a comparison between the detected post-injection tank pressure and a preset threshold value (upper limit value, lower limit value) of the post-injection tank pressure. Further details of the failure sign determination will be described in an operation example described later.

  When it is determined in the failure sign determination that there is a failure sign, the control unit 31 outputs an alarm indicating that the foreign substance removal device 2 can break down. The alarm may be, for example, at least one of an image signal, an alarm lamp lighting signal, and an audio signal.

  The monitoring terminal 33 can be connected to the control unit 31 via the network 34. A specific aspect of the network 34 is not particularly limited, and may be, for example, a fourth generation mobile communication system (4G). The monitoring terminal 33 receives a warning output from the control unit 31 via the network 34, so that a sign of a failure of the foreign matter removing apparatus 2 can be grasped from a remote location (for example, a railway operator's office). In addition, the monitoring terminal 33 may be arrange | positioned not only in a remote place but in the position (for example, station) of a nearer distance from the foreign material removal apparatus 2 than a remote place. The monitoring terminal 33 disposed at a short distance from the foreign substance removing device 2 may be connected to the control unit 31 by wire (for example, an optical cable) or wirelessly.

  The control unit 31 may control the injection of compressed air based on the tank pressure. For example, the control unit 31 may perform control to open the electromagnetic valve 25 when the tank pressure is equal to or higher than a threshold sufficient for the injection of compressed air. Further, the compressor motor 211 may decelerate or stop when the tank pressure is too high.

  In addition, the control unit 31 alerts the monitoring terminal 33 when a train passing signal, a localization state signal, or an inversion state signal has never been input from the host device 4 within a predetermined period (for example, within 24 hours). Output may be performed. By performing such an alarm output, an abnormality of the ATC 12, the switch 13 or the host device 4 can be detected.

  In addition, in order to forcibly stop or restore the foreign substance removal apparatus 2 in an emergency, the control unit 31 may turn off or turn on the control unit 31 in response to a command from the monitoring terminal 33 or a tablet terminal (not shown). .

(Operation example)
Next, an operation example of the foreign matter removal system 1 will be described. FIG. 2 is a flowchart illustrating an operation example of the foreign matter removal system 1 according to the present embodiment. The flowchart of FIG. 2 is repeatedly executed as necessary.

  As shown in FIG. 2, first, the pressure sensor 32 and the control unit 31 detect the tank pressure before and after the injection of compressed air, that is, the pre-injection tank pressure and the post-injection tank pressure (step S1). For example, the control unit 31 compares the input time of the pressure detection signal input from the pressure sensor 32 at a predetermined cycle with the control time for injecting the compressed air, and the pressure immediately before the control for injecting the compressed air. The detection signal may be detected as the pre-injection tank pressure, and the pressure detection signal immediately after the control for injecting the compressed air may be detected as the post-injection tank pressure.

  FIG. 3 is an explanatory diagram for explaining failure sign determination of the foreign matter removing apparatus 2 in the operation example of the foreign matter removing system 1 according to the present embodiment. FIG. 3 shows an example of the upper limit value and the lower limit value of the post-injection tank pressure preset in the control unit 31. As shown in FIG. 3, the upper limit value and the lower limit value of the post-injection tank pressure (vertical axis) differ depending on the pre-injection tank pressure (horizontal axis). In the example of FIG. 3, the upper limit value and the lower limit value of the post-injection tank pressure are each expressed by a linear function with respect to the pre-injection tank pressure.

  The post-injection tank pressure region that is larger than the upper limit is an injection amount insufficient region that indicates that the compressed air injection amount is insufficient. The post-injection tank pressure region smaller than the lower limit is an excessive injection amount region indicating that the compressed air injection amount is excessive. The post-injection tank pressure region that is greater than or equal to the lower limit value and less than or equal to the upper limit value is a region where the injection amount of compressed air is normal. However, since the pre-injection tank pressure has a lower limit value and an upper limit value, the region where the injection amount is normal is not less than the lower limit value of the pre-injection tank pressure, and is not less than the lower limit value of the post-injection tank pressure. It is an area below the upper limit.

  After detecting the tank pressure before and after the injection, the control unit 31 sets the detected post-injection tank pressure and the upper limit value of the post-injection tank pressure of FIG. 3 set in advance corresponding to the detected pre-injection tank pressure, and Contrast with the lower limit. And the control part 31 performs failure sign determination based on whether the tank pressure after injection is larger than an upper limit (step S2). According to the failure sign determination based on such a determination criterion, the abnormal injection resulting from the malfunction of the electromagnetic valve 25 or the control unit 31 that controls the electromagnetic valve 25 can be detected as a failure sign of the foreign substance removal device 2. it can.

  The upper limit value and the lower limit value of the post-injection tank pressure may be values common to the two points 6 shown in the example of FIG. 1, or may be individual values according to the two points 6. There may be. When the upper limit value and the lower limit value are individually set according to the point 6, at least one of the slope and intercept of the linear function (see FIG. 3) representing the upper limit value and the lower limit value may be different for each point 6. Further, the upper limit value and the lower limit value may be values expressed by a function other than a linear function. By setting individual upper limit values and lower limit values for each of the plurality of points 6 corresponding to the foreign matter removing apparatus 2 as the upper limit value and the lower limit value of the post-injection tank pressure used for the failure sign determination, the determination accuracy of the failure sign determination can be improved. Can be improved. Thus, the configuration in which the threshold value for failure sign determination is individually set for each of the plurality of points 6 corresponding to the foreign matter removing apparatus 2 can also be adopted in each modification described later.

  When the post-injection tank pressure is larger than the upper limit value (step S2: Yes), the control unit 31 determines that there is a sign of a failure of the foreign matter removing apparatus 2, and notifies that the injection amount is insufficient as a determination result. An injection amount shortage alarm is output to the monitoring terminal 33 (step S3).

  On the other hand, when the post-injection tank pressure is equal to or lower than the upper limit value (step S2: No), the control unit 31 performs a failure sign determination based on whether the post-injection tank pressure is smaller than the lower limit value (step S4).

  When the post-injection tank pressure is smaller than the lower limit value (step S4: Yes), the control unit 31 determines that there is a sign of failure of the foreign matter removing apparatus 2, and notifies that the injection amount is excessive as a determination result. An excessive injection amount warning is output to the monitoring terminal 33 (step S5).

  On the other hand, when the post-injection tank pressure is equal to or higher than the lower limit value (step S4: No), the control unit 31 determines that there is no sign of failure of the foreign matter removing apparatus 2, and does not output an alarm to the monitoring terminal 33. The process ends. In this case, the control unit 31 may output information for notifying that the foreign matter removing apparatus 2 is normal to the monitoring terminal 33.

  In addition to operating as a failure sign determination unit, the control unit 31 also operates as a failure determination unit, and may determine the presence or absence of a failure in the foreign substance removal device 2 based on the detected tank pressure. . For example, the control unit 31 sets the post-injection tank pressure and the upper limit value (that is, the second upper limit value) and lower limit value (that is, the second upper limit value) of the post-injection tank pressure corresponding to the pre-injection tank pressure. Based on the comparison with the lower limit value, determination of the presence or absence of failure of the foreign substance removal apparatus 2 (hereinafter also referred to as failure determination) may be performed. In other words, the control unit 31 may change the threshold value of the pressure used for the determination depending on whether the failure sign determination is performed or the failure determination is performed.

  Specifically, the control unit 31 determines that the post-injection tank pressure is larger than a second upper limit value that is larger than the upper limit value (that is, the first upper limit value) shown in FIG. 3, or is shown in FIG. It may be determined that the foreign substance removing device 2 is out of order when it is smaller than the second lower limit value smaller than the lower limit value (that is, the first lower limit value). Note that the second upper limit value may be expressed as a linear function having the same slope and a large intercept on the vertical axis with respect to the linear function shown in FIG. 3 (that is, the first upper limit value). Further, the second lower limit value may be expressed as a linear function having the same slope and a small intercept on the vertical axis with respect to the linear function shown in FIG. 3 (that is, the first lower limit value).

  More specifically, after detecting the tank pressure before and after injection (step S1) in FIG. 2, the control unit 31 performs a failure determination based on whether or not the post-injection tank pressure is greater than the second upper limit value. Also good. Then, when it is determined that there is a failure (that is, greater than the second upper limit value) in the failure determination based on whether or not it is greater than the second upper limit value, the control unit 31 is the same as in the case of the failure sign determination. May be output (step S3 in FIG. 2).

  On the other hand, when it is determined that there is no failure (that is, equal to or lower than the second upper limit value) in the failure determination based on whether or not the control unit 31 is greater than the second upper limit value, the post-injection tank pressure is Failure determination based on whether the value is smaller than the lower limit of 2 may be performed. Then, when it is determined that there is a failure (that is, smaller than the second lower limit value) in the failure determination based on whether or not it is smaller than the second lower limit value, the control unit 31 is the same as the failure sign determination case. May be output (step S5 in FIG. 2).

  On the other hand, when it is determined that there is no failure (that is, equal to or higher than the second lower limit value) in the failure determination based on whether or not the control unit 31 is smaller than the second lower limit value, the post-injection tank pressure is the upper limit. A failure sign determination (step S2 in FIG. 2) based on whether or not the value is greater than the value (that is, the first upper limit value) may be performed.

  The control unit 31 may change the alarm output mode in the failure determination from the alarm output mode in the failure sign determination. For example, the control unit 31 may output an alarm in the failure determination in an output mode (for example, a conspicuous display color, a message content that prompts an emergency response, a loud sound, etc.) that is more urgent than an alarm in the failure sign determination. .

  According to the present embodiment, the electromagnetic valve 25 and the control unit are not used as a sign of the failure of the foreign matter removing apparatus 2 but only when the failure of the foreign matter removing device 2 is detected only by detecting the occurrence of non-conversion of the track branching portion. Abnormal injection resulting from the 31 malfunction can be detected. As a result, since the electromagnetic valve 25 and the control unit 31 can be repaired and replaced before the actual failure occurs, the failure of the foreign matter removing device 2 can be detected early (ie, in advance). . Since the failure can be detected at an early stage, the foreign matter removing device 2 is repaired or replaced in a planned manner compared to the case where the foreign matter removing device 2 is repaired or replaced after the failure occurs. It is also possible to prevent a failure from occurring.

  Further, the post-injection tank pressure can be considered to be approximately proportional to the pressure obtained by subtracting the pressure lost by the injection of compressed air from the pre-injection tank pressure, so the pressure lost by one injection is assumed to be substantially constant. In this case, a correlation is established that the normal value of the post-injection tank pressure increases as the pre-injection tank pressure increases. Based on such a correlation, in this embodiment, the failure sign determination is performed using the upper limit value and the lower limit value of FIG. 3 having a linear function relationship with the pre-injection tank pressure. As a result, a more precise failure sign determination adapted to the pre-injection tank pressure can be performed, so that the failure of the foreign substance removal device 2 can be detected more reliably at an early stage.

  Moreover, when performing failure determination in addition to failure sign determination, an actual failure of the foreign substance removal apparatus 2 can be detected. In this case, the inversion of the branch portion does not immediately occur due to the failure of the foreign substance removal device 2, but an emergency response can be made to prevent the occurrence of inversion due to the failure.

(First modification)
Next, a first modification for self-checking the foreign matter removing apparatus 2 will be described. 1-3 demonstrated the example which the control part 31 operate | moves as a failure sign determination means and an alarm output means. On the other hand, in the first modification, the control unit 31 also operates as an inspection unit.

  Specifically, the control unit 31 performs control for injecting compressed air in accordance with a self-check command from the monitoring terminal 33 through the network 34, and the foreign matter removing apparatus 2 is controlled based on the increase in the post-injection tank pressure. Check for failure (ie, self-check). The control unit 31 outputs the inspection result to the monitoring terminal 33.

  Hereinafter, an operation example of the foreign matter removal system 1 of the first modification will be described with reference to FIGS. 4 and 5. FIG. 4 is a flowchart showing an operation example of the foreign matter removal system 1 according to the first modification of the present embodiment. The flowchart of FIG. 4 is repeatedly executed as necessary. In the initial state of FIG. 4, it is assumed that a plurality of (four in FIG. 1) electromagnetic valves 25 of the foreign matter removing device 2 are all closed. FIG. 5 is a time chart showing an operation example of the foreign matter removal system 1 according to the first modification of the present embodiment.

  As shown in FIG. 4, first, the control unit 31 determines whether or not a self-check command is input from the monitoring terminal 33 (step S11).

  When a self-check command is input (step S11: Yes), the control unit 31 sets the electromagnetic valve 25 that instructs opening as the first (i = 1) electromagnetic valve among the total of n electromagnetic valves 25. It is set to 25 (step S12). In the example of FIG. 5, the total number n of the electromagnetic valves 25 is set to four in accordance with the number of the electromagnetic valves 25 of the foreign matter removing apparatus 2 of FIG. The control unit 31 outputs a solenoid valve control signal instructing opening of the first solenoid valve 25, thereby injecting compressed air for a predetermined time by the first solenoid valve 25 as shown in FIG. Step S13).

  After injection for a predetermined time by the first electromagnetic valve 25, the control unit 31 closes the first electromagnetic valve 25 as shown in FIG. The process waits (step S14). As shown in FIG. 5, the tank pressure rises as new compressed air generated by the compressor 21 flows into the tank 22 with all the solenoid valves 25 closed during a predetermined interval. The interval may be 10 seconds, for example.

  After waiting for the interval, the control unit 31 determines whether or not injection by all the electromagnetic valves 25 has been completed, that is, whether or not i is the total number n of electromagnetic valves (step S15).

  When the injection by all the solenoid valves 25 is completed (step S15: Yes), the control unit 31 is preset from the completion of the interval based on the pressure detection signal from the pressure sensor 32 as shown in FIG. The tank pressure increase amount within a certain period until the self-check completion time is measured (step S16). Note that the fixed period for measuring the tank pressure increase amount may be, for example, 20 seconds.

  On the other hand, when injection by all the solenoid valves 25 is not completed (step S15: No), the control part 31 sets the solenoid valve 25 which instruct | indicates opening to the following solenoid valve 25. FIG. That is, i is incremented (step S17). And it transfers to the injection of the predetermined time by the following solenoid valve 25 (step S13).

  After measuring the tank pressure increase amount, the control unit 31 determines whether or not the measured tank pressure increase amount is larger than the threshold value (step S18).

  When the tank pressure increase amount is larger than the threshold value (step S18: Yes), it can be determined that the compressed air is normally generated by the compressor 21 and no air leakage occurs. In this case, the control unit 31 outputs a normal result indicating that the compressor 21 is normal to the monitoring terminal 33 (step S19). On the other hand, when the tank pressure increase amount is equal to or less than the threshold (step S18: No), the control unit 31 outputs an abnormality result indicating that the compressor 21 is abnormal to the monitoring terminal 33 (step S20).

  In the first modification, the failure sign determination of the foreign substance removal apparatus 2 may be performed either before or after the self-check.

  According to the first modification, the result of the self-check can be remotely monitored by the monitoring terminal 33, so that the failure of the foreign matter removing apparatus 2 can be detected without going to the site.

(Second modification)
Next, a second modification example in which failure sign determination is performed during the self-check period will be described. FIG. 6 is a flowchart showing an operation example of the foreign matter removal system 1 according to the second modification of the present embodiment. The flowchart of FIG. 6 is repeatedly executed as necessary. In the first modification, the execution timing of the failure sign determination is independent of the execution timing of the self-check. On the other hand, in the second modification, failure sign determination is performed during the self-check period.

  Specifically, as shown in FIG. 6, the pressure sensor 32 and the control unit 31 detect the post-injection tank pressure after the injection for a predetermined time for the self-check (step S13) is performed (step S102). ). Thereafter, as in FIG. 2, a failure sign determination (step S2, step S4) is performed by comparing the post-injection tank pressure with the upper limit value or the lower limit value, and an alarm is output according to the determination result (step S3, step S4). S5).

  The control unit 31 replaces the failure sign determination (step S2, step S4) by comparing the post-injection tank pressure with the upper limit value or the lower limit value, and the pressure difference between the pre-injection tank pressure and the post-injection tank pressure, A failure sign determination based on a comparison with a preset threshold value of the pressure difference may be performed. For example, the control unit 31 calculates the pressure difference between the pre-injection tank pressure and the post-injection tank pressure before and after the injection by each of the first to n-th electromagnetic valves 25, and sets the calculated pressure difference in advance. It may be compared with the threshold value of the pressure difference. Then, when the calculated pressure difference is larger than the threshold value, the control unit 31 may determine that there is a sign of failure of the foreign matter removing apparatus 2 and may output an alarm to the monitoring terminal 33 as a determination result. Further, the pressure difference threshold value may include an upper limit side threshold value and a lower limit side threshold value. In this case, when the calculated pressure difference becomes larger than the upper limit side threshold value, the control unit 31 outputs an excessive injection amount warning (see step S5 in FIG. 6), and the calculated pressure difference becomes lower limit side. If it is smaller than the threshold value, an injection amount shortage alarm (see step S3 in FIG. 6) may be output.

  Also in the second modified example, in addition to the failure sign determination, the control unit 31 determines whether the post-injection tank pressure described above is larger than the second upper limit value or smaller than the second lower limit value. A failure determination based on this may be performed.

  According to the second modified example, since the injection at the time of self-check can be used for the failure sign determination, the failure sign determination can be performed efficiently. Further, a failure sign that cannot be detected by the self-check can be detected by failure sign determination.

(Third Modification)
Next, a description will be given of a third modification for acquiring the image of the orbit branching unit. FIG. 7 is a diagram showing a foreign matter removal system 1 according to a third modification.

  As shown in FIG. 7, the foreign matter removal system 1 of the third modified example includes a web camera 35 installed at the track branching portion. The web camera 35 transmits a branching part video signal obtained by photographing the orbital branching part to the monitoring terminal 33.

  According to the third modification, it is possible to issue a self-check command after confirming that there is no worker in the start-up branch section based on the image of the track branch section. Thereby, it is possible to prevent the work from being obstructed by performing the injection during the work at the track branching portion.

  The web camera 35 may be activated or stopped in response to a command from the monitoring terminal 33. In this case, since the web camera 35 can be activated when necessary before the self-check, power consumption by the web camera 35 can be reduced.

(Fourth modification)
Next, a fourth modification example in which failure sign determination is performed based on the amount of change in tank pressure over a predetermined time will be described. FIG. 8 is a flowchart showing an operation example of the foreign matter removal system 1 according to the fourth modification of the present embodiment. The flowchart of FIG. 8 is repeatedly executed as necessary.

  In the fourth modification, the control unit 31 performs failure sign determination based on the amount of change in tank pressure over a predetermined time.

  Specifically, as shown in FIG. 8, first, the pressure sensor 32 starts detecting the tank pressure (step S21).

  After starting the detection of the tank pressure, the control unit 31 determines whether or not a predetermined time has elapsed since the start of the detection of the tank pressure (step S22). The predetermined time may be, for example, 1 minute.

  When the predetermined time has elapsed (step S22: Yes), the pressure sensor 32 ends the detection of the tank pressure (step S23).

  On the other hand, when the predetermined time has not elapsed (step S22: No), the control unit 31 repeats the determination of whether or not the predetermined time has elapsed (step S22).

  After completing the detection of the tank pressure, the control unit 31 calculates a pressure drop amount for a predetermined time (step S24).

  After calculating the pressure drop amount, the control unit 31 performs a failure sign determination based on whether or not the pressure drop amount is larger than the threshold (step S25). According to the failure sign determination based on such a determination criterion, it is possible to detect an air leak under a tank pressure near the working pressure as a sign of a failure of the foreign matter removing apparatus 2.

  When the pressure drop amount is larger than the threshold value (step S25: Yes), the control unit 31 determines that there is a sign of failure of the foreign matter removing apparatus 2, and outputs an alarm to the monitoring terminal 33 as a determination result (step S26). ).

  On the other hand, when the pressure drop amount is equal to or smaller than the threshold value (step S25: No), the control unit 31 determines that there is no sign of failure of the foreign matter removing apparatus 2, and performs the process without outputting an alarm to the monitoring terminal 33. finish.

  According to the fourth modified example, a failure sign can be detected on the basis of the change amount of the tank pressure, that is, the pressure drop amount, before the failure that the compressed air cannot be injected due to the shortage of the tank pressure due to the air leakage occurs.

  Note that also in the fourth modification, the control unit 31 may perform the failure determination in addition to the failure sign determination. In this case, the determination criterion for failure determination may be, for example, that the tank pressure is less than a predetermined pressure (for example, 0.3 MPa).

(Fifth modification)
Next, a fifth modification example in which failure sign determination is performed based on both the tank pressure and the machine room temperature will be described. So far, the example of performing the failure sign determination based on the tank pressure has been described. On the other hand, in the fifth modification, the failure sign determination is performed based on both the tank pressure and the temperature in the machine room 20 (hereinafter also referred to as the machine room temperature).

  FIG. 9 is a diagram illustrating a foreign matter removal system 1 according to a fifth modification of the present embodiment. As shown in FIG. 9, the foreign matter removal system 1 of the fifth modification example further includes a temperature sensor 37 installed in the machine room 20 in addition to the configuration of FIG. 1.

  The temperature sensor 37 detects the machine room temperature, and outputs a temperature detection signal indicating the detected machine room temperature to the control unit 31.

  The controller 31 performs failure sign determination based on the amount of change in tank pressure and machine room temperature during a predetermined time. Specifically, when the change amount of the tank pressure is acquired, the control unit 31 indicates a decrease in the machine room temperature (that is, the ambient temperature of the compressor 21) equal to or higher than a threshold value which is an example of a predetermined state. In addition, it is not determined that there is a sign of failure of the foreign matter removing apparatus 2. In addition, the control part 31 has a sign of failure of the foreign substance removal apparatus 2 even when the change amount of the tank pressure is acquired at a time within a fixed time after the operation (start) of the compressor 21 at the time of injection. It is not necessary to make a determination that it exists.

  An operation example of the foreign matter removal system 1 of the fifth modified example configured as described above will be described with reference to FIG. FIG. 10 is a flowchart showing an operation example of the foreign matter removal system 1 according to the fifth modification of the present embodiment. The flowchart of FIG. 10 is repeatedly executed as necessary.

  As shown in FIG. 10, first, the pressure sensor 32 and the temperature sensor 37 start detecting the tank pressure and the machine room temperature (step S31).

  After the detection of the tank pressure and the machine room temperature is started, the control unit 31 determines whether or not a predetermined time has elapsed since the start of the detection of the tank pressure and the machine room temperature (step S32).

  When the predetermined time has elapsed (step S32: Yes), the pressure sensor 32 and the temperature sensor 37 end the detection of the tank pressure and the machine room temperature (step S33).

  On the other hand, when the predetermined time has not elapsed (step S32: No), the control unit 31 repeats the determination of whether or not the predetermined time has elapsed (step S32).

  After the detection of the tank pressure and the machine room temperature is completed, the control unit 31 calculates a pressure drop amount and a temperature drop amount for a predetermined time (step S34).

  After calculating the pressure drop amount and the temperature drop amount, the control unit 31 performs a failure sign determination based on whether or not the pressure drop amount is larger than the threshold value (step S35).

  When the pressure drop amount is larger than the threshold value (step S35: Yes), the control unit 31 performs failure sign determination following step S35 based on whether or not the temperature drop amount is smaller than the threshold value (step S36).

  On the other hand, when the pressure drop amount is equal to or smaller than the threshold value (step S35: No), the control unit 31 determines that there is no sign of failure of the foreign matter removing apparatus 2, and performs processing without outputting an alarm to the monitoring terminal 33. finish.

  When the temperature drop amount is smaller than the threshold value (step S36: Yes), the control unit 31 determines that there is a sign of failure of the foreign matter removing apparatus 2, and outputs an alarm to the monitoring terminal 33 as the determination result (step S37). ).

  On the other hand, when the temperature drop amount is equal to or greater than the threshold value (step S36: No), the control unit 31 ends the process without outputting an alarm to the monitoring terminal 33 even when the pressure drop amount is greater than the threshold value. To do.

  When the machine room temperature rapidly decreases, the tank pressure also decreases as the machine room temperature decreases. Such a decrease in the tank pressure accompanying a decrease in the temperature in the machine room is a phenomenon due to Boyle-Charles' law, and not a phenomenon caused by air leakage. According to the fifth modified example, it is possible to prevent erroneous determination by not determining that a decrease in tank pressure caused by a cause different from air leakage is a sign of failure.

  Note that also in the fifth modification, the control unit 31 may perform the failure determination in addition to the failure sign determination. In this case, the determination criterion for failure determination may be, for example, that the tank pressure is less than a predetermined pressure (for example, 0.3 MPa).

(Sixth Modification)
Next, a sixth modification example in which failure sign determination is performed based on the machine room temperature will be described with reference to FIG. FIG. 11 is a flowchart showing an operation example of the foreign matter removal system 1 according to the sixth modification of the present embodiment. The flowchart of FIG. 11 is repeatedly executed as necessary. Moreover, the flowchart of FIG. 11 can be implemented by the foreign matter removal system 1 of the fifth modified example.

  As shown in FIG. 11, first, the temperature sensor 37 detects the machine room temperature (step S41).

  After detecting the machine room temperature, the control unit 31 performs a failure sign determination based on whether or not the detected machine room temperature is greater than a threshold value (step S42). According to the failure sign determination based on such a determination criterion, the malfunction of the exhaust fan (not shown) installed in the machine room 20 or the over frequency operation of the compressor 21 is detected as a failure sign of the foreign matter removing device 2. Can be detected.

  The failure sign determination based on the machine room temperature (step S42) is the same as the failure sign determination based on the tank pressure (steps S2 and S4 in FIG. 2, FIG. 6, step S25 in FIG. 8, or steps S35 and S36 in FIG. 10). It may be performed at the timing or may be performed at a different timing.

  When the machine room temperature is higher than the threshold (step S42: Yes), the control unit 31 determines that there is a sign of a failure of the foreign matter removing apparatus 2, and outputs an alarm to the monitoring terminal 33 as a determination result (step S43). ). The threshold value of the machine room temperature may be 50 ° C., for example.

  On the other hand, when the machine room temperature is equal to or lower than the threshold value (step S42: No), the control unit 31 determines that there is no sign of failure of the foreign matter removing apparatus 2, and performs processing without outputting an alarm to the monitoring terminal 33. finish.

  The foreign matter removing device 2 is required to operate normally without failure so that foreign matters other than ice and snow can be removed not only in winter when snow removal at point 6 is necessary, but also in a high temperature environment in summer. According to the sixth modification, it is possible to prevent the occurrence of a failure of the foreign matter removal apparatus 2 at a high temperature such as in summer by detecting a sign of the failure of the foreign matter removal device 2 due to a high temperature.

  Note that also in the sixth modification, the control unit 31 may perform the failure determination in addition to the failure sign determination. In this case, the determination criterion for failure determination may be, for example, that the temperature in the machine room is larger than a failure determination threshold value that is greater than a failure sign determination threshold value (step S42 in FIG. 11). The threshold value for failure determination may be 60 ° C., for example.

(Seventh Modification)
Next, a seventh modified example in which failure sign determination is performed based on the current value of the compressor motor 211 will be described. FIG. 12 is a diagram showing a foreign matter removal system 1 according to a seventh modification of the present embodiment.

  As shown in FIG. 12, the foreign matter removal system 1 of the seventh modification example further includes a current sensor 38 disposed in the compressor 21 in addition to the configuration of FIG. 9. The current sensor 38 detects a current value (hereinafter also referred to as a compressor motor current value) of a current supplied from a power supply device (not shown) to the compressor motor 211, and controls a current detection signal indicating the detected compressor motor current value. To 31. The control unit 31 performs a failure sign determination based on whether or not the compressor motor current value is greater than a threshold value, and outputs an alarm according to the determination result.

  Next, with reference to FIG. 13, an operation example of the foreign matter removal system 1 of the seventh modification will be described. FIG. 13 is a flowchart showing an operation example of the foreign matter removal system 1 according to the seventh modification of the present embodiment. The flowchart of FIG. 13 is repeatedly executed as necessary.

  As shown in FIG. 13, first, the current sensor 38 detects the compressor motor current value (step S51).

  After the compressor motor current value is detected, the control unit 31 performs a failure sign determination based on whether or not the compressor motor current value is greater than a threshold value (step S52). The threshold value of the compressor motor current value is, for example, the compressor motor current value during normal operation. According to the failure sign determination based on such a determination criterion, an abnormality in the compressor motor current value can be detected as a sign of failure of the foreign substance removal device 2.

  The failure sign determination based on the compressor motor current value (step S52) includes the failure sign determination based on the tank pressure (steps S2 and S4 in FIG. 2, FIG. 6, step S25 in FIG. 8, or steps S35 and S36 in FIG. 10) and It may be performed at the same timing as the failure sign determination based on the machine room temperature (step S42 in FIG. 11), or may be performed at a different timing.

  When the compressor motor current value is larger than the threshold value (step S52: Yes), the control unit 31 determines that there is a sign of failure of the foreign matter removing apparatus 2, and outputs an alarm to the monitoring terminal 33 as a determination result (step). S53).

  On the other hand, when the compressor motor current value is less than or equal to the threshold value (step S52: No), the control unit 31 determines that there is no sign of failure of the foreign matter removing apparatus 2, and performs processing without outputting an alarm to the monitoring terminal 33. Exit.

  When a thermal relay is provided in the foreign matter removing device 2 as a protection device for the compressor 21, the thermal relay detects an overcurrent of the compressor motor 211 to shut off the electromagnetic contactor of the thermal relay and stop the compressor motor 211. When the compressor motor 211 is stopped by the thermal relay, the foreign matter removing apparatus 2 cannot operate until the work for returning the compressor motor 211 to the site is completed. According to the seventh modification, before the compressor motor current value reaches the overcurrent, it can be detected that the compressor motor current value has exceeded a failure sign determination threshold value lower than the overcurrent. Thereby, when providing the thermal relay in the foreign material removal apparatus 2, the failure stop of the compressor motor 211 by overcurrent can be prevented beforehand.

  In the seventh modification, the control unit 31 may perform a failure determination based on whether or not the compressor motor current value has reached an overcurrent, in addition to the failure sign determination.

(Eighth modification)
Next, an eighth modification example having a failure monitoring function of the pressure sensor 32 will be described. FIG. 14 is a diagram showing a foreign matter removal system 1 according to an eighth modification of the present embodiment.

  As shown in FIG. 14, the foreign matter removal system 1 of the eighth modified example further includes a preliminary pressure sensor 39 in addition to the configuration of FIG. 12. Similar to the pressure sensor 32 (hereinafter also referred to as a main pressure sensor), the preliminary pressure sensor 39 detects the tank pressure and outputs a pressure detection signal indicating the detected tank pressure to the control unit 31.

  The control unit 31 determines a failure of the main pressure sensor 32 based on the comparison between the tank pressure detected by the main pressure sensor 32 and the tank pressure detected by the auxiliary pressure sensor 39. When the controller 31 detects a failure of the main pressure sensor 32, the controller 31 outputs an alarm to the monitoring terminal 33.

  Next, an operation example of the foreign matter removal system 1 according to the eighth modification will be described with reference to FIG. FIG. 15 is a flowchart showing an operation example of the foreign matter removal system 1 according to the eighth modification of the present embodiment. The flowchart of FIG. 15 is repeatedly executed as necessary.

  As shown in FIG. 15, the main pressure sensor 32 detects the tank pressure (step S61). At this time, the preliminary pressure sensor 39 also detects the tank pressure (step S62).

  After the tank pressure is detected by the main pressure sensor 32 and the preliminary pressure sensor 39, the control unit 31 calculates the pressure difference between the tank pressure detected by the main pressure sensor 32 and the tank pressure detected by the preliminary pressure sensor 39 ( Step S63).

  After calculating the pressure difference, the control unit 31 determines whether or not the calculated pressure difference is larger than a preset pressure difference threshold value (step S64).

  When the pressure difference is larger than the threshold value, the control unit 31 determines that the main pressure sensor 32 is out of order, and outputs an alarm to the monitoring terminal 33 (step S65).

  On the other hand, when the pressure difference is equal to or smaller than the threshold value, the control unit 31 determines that the main pressure sensor 32 has not failed, and ends the process without outputting an alarm to the monitoring terminal 33.

  Note that the control unit 31 may output an alarm not only when a failure of the main pressure sensor 32 is detected based on the pressure difference but also when a disconnection of the pressure sensors 32 and 39 is detected, for example. Further, when a failure of the main pressure sensor 32 is detected, the control unit 31 replaces the main pressure sensor 32 with the tank pressure detected by the preliminary pressure sensor 39 and determines the failure sign or the operation of the foreign matter removing device 2. It may be used for control.

  As described above, the tank pressure can be used for various processes such as opening / closing of the electromagnetic valve 25, rotation of the compressor motor 211, and failure prediction determination of the foreign matter removing apparatus 2. For this reason, the influence of the failure of the main pressure sensor 32 that detects the tank pressure on the operation of the foreign matter removal system 1 is large. According to the eighth modification, a failure of the main pressure sensor 32 can be reliably detected by comparison with the tank pressure detected by the preliminary pressure sensor 39, so that the main pressure sensor 32 is repaired or replaced. The foreign substance removal system 1 can be operated soundly.

  The embodiments and the modifications described above may be combined as appropriate. In addition to the above-described modifications, various modifications can be applied to the present invention. For example, the monitoring terminal 33 may display the tank pressure, the machine room temperature, and the compressor motor current value acquired from the control unit 31 via the network on the display as time-lapse information. Further, the number of lines corresponding to one foreign matter removing device 2 may be one, or may be three or more. Moreover, the control part 31 may perform a failure determination with the same determination method as the various failure sign determinations described above. The embodiment in this case is described by replacing the term “failure sign determination” with the term “failure determination” and replacing the term “failure sign” with the term “failure” in the above-described embodiment. be able to. In this case, even if the foreign matter removing device 2 does not actually fail, it is determined that there is a failure if there is a sign of the failure, but the failure can be detected in advance. Can respond systematically.

  The aspect of the present invention is not limited to the above-described embodiment, and includes various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-described contents. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Foreign material removal system, 2 Foreign material removal apparatus, 21 Compressor, 22 Tank, 23 Nozzle, 31 Control part, 32 Pressure sensor

Claims (12)

A generator that generates compressed gas; a holder that holds the generated compressed gas; and an injector that injects the held compressed gas to remove foreign matter present in the orbital branching portion. A pressure detecting means arranged in a foreign matter removing device for detecting the pressure inside the cage;
A foreign matter removal apparatus monitoring system comprising: failure sign determination means for determining whether or not there is a failure sign of the foreign matter removal apparatus based on the detected pressure inside the cage.   The failure sign determination means includes a first pressure of the pressure inside the cage detected after the injection and a pressure inside the cage after the injection corresponding to the pressure inside the cage detected before the injection. The monitoring system according to claim 1, wherein the presence / absence of the failure sign is determined based on a comparison between the upper limit value and the first lower limit value. A failure determination means for determining the presence or absence of a failure of the foreign matter removing device based on the detected pressure inside the cage;
The failure determination means includes a second upper limit of the pressure inside the cage detected after the injection and the pressure inside the cage after the injection corresponding to the pressure inside the cage detected before the injection. The monitoring system according to claim 2, wherein the presence / absence of the failure is determined based on a comparison between the value and the second lower limit value.   The failure sign determination means determines whether or not there is a sign of failure based on a pressure difference between a pressure inside the retainer detected before the injection and a pressure inside the retainer detected after the injection. Item 2. The monitoring system according to Item 1.   The monitoring system according to claim 1, wherein the failure sign determination unit determines whether or not there is a failure sign based on a pressure inside the retainer detected after the injection.   The monitoring system according to claim 1, wherein the failure sign determination unit determines whether or not there is a failure sign based on a change amount of the detected pressure in the cage in a predetermined time.   The monitoring system according to claim 6, wherein the failure sign determination unit does not determine that the failure sign is present when the foreign matter removal apparatus is in a predetermined state when the change amount is acquired.   The monitoring system according to claim 7, wherein the predetermined state includes at least one of the predetermined time after the operation of the generator at the time of the injection, when the ambient temperature of the generator decreases.   The monitoring system according to claim 1, further comprising an alarm output unit that outputs an alarm when it is determined that there is a sign of the failure.   The monitoring system according to any one of claims 1 to 9, further comprising inspection means for inspecting the presence or absence of a failure of the foreign matter removing apparatus based on a change amount of the pressure inside the cage after the injection. Foreign matter removal having a generator for generating compressed gas, a holder for holding the generated compressed gas inside, and an injector for injecting the held compressed gas to remove foreign matter at the orbital branching portion Equipment,
A failure detection determination unit that is disposed in the foreign matter removal apparatus and detects pressure inside the cage, and that determines whether or not the foreign matter removal apparatus has failed based on the detected pressure inside the cage. A foreign matter removing system comprising: a monitoring system having means. Foreign matter removal having a generator for generating compressed gas, a holder for holding the generated compressed gas inside, and an injector for injecting the held compressed gas to remove foreign matter at the orbital branching portion In the apparatus, the pressure inside the cage is detected,
A method for monitoring a foreign matter removing apparatus, wherein the presence or absence of a failure sign of the foreign matter removing apparatus is determined based on the detected pressure inside the cage.

Images