JP2021173358A - Hydraulic equipment monitoring system - Google Patents

Abstract

To provide a hydraulic equipment monitoring system capable of preventing occurrence of liquid leakage by more appropriately grasping the maintenance timing of a seal material.SOLUTION: This hydraulic equipment monitoring system includes hydraulic equipment, liquid pressure sensors 110, 150 for monitoring liquid pressure inside the hydraulic equipment, display devices 230, 250 for displaying a state of the hydraulic equipment, a return device 240 for returning the state of the display devices 230, 250 to an initial state, and a control device 180. The control device 180 includes: a first step for determining whether the state is a normal operation state, a maintenance state, or a use stop state, on the basis of a signal acquired from the liquid pressure sensors 110, 150; and a second step for displaying on the display device whether the state is the normal operation state, the maintenance state, or the use stop state, on the basis of the determination result of the first step.SELECTED DRAWING: Figure 3

Description

The present invention relates to a hydraulic device monitoring system that monitors the state of a hydraulic device.

Techniques for detecting liquid leakage in hydraulic equipment include, for example, Japanese Patent Application Laid-Open No. 2019-194484 (Patent Document 1), Japanese Patent Application Laid-Open No. 2018-054021 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2017-089668 (Patent Document 1). 3) and Japanese Patent Application Laid-Open No. 2016-045068 (Patent Document 4).

JP-A-2019-194484 JP-A-2018-054021 Japanese Unexamined Patent Publication No. 2017-0896668 Japanese Unexamined Patent Publication No. 2016-045068

According to the techniques disclosed in each of the above patent documents, a liquid leak can be detected, but no system for notifying a state leading to a liquid leak is disclosed.

An object of the present invention is to solve the above-mentioned problems, and to provide a hydraulic device monitoring system capable of more accurately grasping the maintenance timing of the sealing material and preventing the occurrence of liquid leakage. Is.

The hydraulic device monitoring system according to the present invention includes a hydraulic device, a hydraulic sensor that monitors the hydraulic pressure inside the hydraulic device, a display device that displays the state of the hydraulic device, and the display device. The control device is provided with a return device for returning the state of The first step of determining whether or not, and the second step of displaying on the display device which of the above-mentioned normal operation, the above-maintenance, and the above-mentioned suspension of use is based on the determination result of the first step. include.

In another form, the display device has a normal operation lighting unit, a maintenance lighting unit, and a use stop lighting unit, and the control device has the normal operation lighting unit, based on the determination of the second step. Light either the maintenance lighting unit or the use stop lighting unit.

In another embodiment, the display device includes a display device, and the control device is attached to the display device at the start of the normal operation, the start date and time of the transition to the maintenance, and the start of the transition to the suspension of use. Display the date and time.

In another embodiment, the sounding device is further provided, and the control device operates the sounding device when it is determined in the second step of the control device that the maintenance is performed.

In another embodiment, the control device activates the sounding device when it is determined in the above two steps of the control device that the use is stopped.

In another form, the control device makes the timbre different when the sounding device is operated when it is determined that the maintenance is performed and when it is determined that the use is stopped.

In another embodiment, the plurality of hydraulic devices including the hydraulic sensors are included, and the control device corresponds to each hydraulic device based on the signals obtained from the plurality of hydraulic sensors, and the first step. And the above second step is executed.

In another form, a signal is transmitted between the hydraulic pressure sensor and the control device by a wired system or a wireless system.

In another form, an operation panel is provided externally, and a signal is transmitted between the operation panel and the control device by a wired system or a wireless system.

According to this hydraulic device monitoring system, it is possible to more accurately grasp the maintenance timing of the sealing material and provide a hydraulic device monitoring system that prevents the occurrence of liquid leakage.

It is sectional drawing which shows the state which assembled the structure of the liquid leakage detection unit adopted for the hydraulic pressure apparatus monitoring system in embodiment to a shaft. It is a figure which shows the schematic structure of the hydraulic pressure equipment monitoring system in embodiment. It is a block diagram of the hydraulic pressure equipment monitoring system in embodiment. It is a figure which shows the operation content of the hydraulic pressure equipment monitoring system in embodiment. It is a figure which shows the display provided in the system main body of the hydraulic pressure apparatus monitoring system in embodiment. It is sectional drawing which shows the state which the structure of the liquid leakage detection unit adopted for the hydraulic pressure apparatus monitoring system in another Embodiment is assembled to the shaft. It is a figure which shows the schematic structure of the hydraulic pressure equipment monitoring system in another embodiment.

The hydraulic device monitoring system according to this embodiment will be described below with reference to the drawings. When the number, quantity, etc. are referred to in the embodiments described below, the scope of the present invention is not necessarily limited to the number, quantity, etc., unless otherwise specified. In addition, the same parts and equivalent parts may be given the same reference numbers, and duplicate explanations may not be repeated. The seal structure shown below is an example, and the liquid leak detection unit and the hydraulic pressure device monitoring system described below can be applied to various other seal structures.

(Liquid leak detection unit 100)
The configuration of the liquid leakage detection unit 100 will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a state in which the liquid leakage detection unit 100 is assembled to the shaft when the hydraulic pressure sensor according to the present embodiment is used.

With reference to FIG. 1, the liquid leakage detection unit 100 is an assembly unit that is assembled to the shaft 21 of the hydraulic cylinder 20. The shaft 21 has a shape extending axially along the central axis 101. The shaft 21 is a movable shaft. In this embodiment, it is assumed that the shaft 21 is the shaft of the hydraulic cylinder 20. The shaft 21 reciprocates in the axial direction of the central axis 101.

A housing 31 is provided on the outer circumference of the shaft 21. The housing 31 has a shape extending in a cylindrical shape in the axial direction of the central axis 101.

A liquid side space 60 is defined on the outer circumference of the shaft 21. The liquid side space 60 is filled with oil. The liquid side space 60 is provided as a hydraulic chamber to which oil for operating the shaft 21 is supplied. The liquid side space 60 is provided on one side of the housing 31 in the axial direction of the central axis 101. An external space 70 is defined on the other side of the housing 31 in the axial direction of the central axis 101.

The liquid leak detection unit 100 has a first rod seal 23A as a primary seal, a second rod seal 23B as a secondary seal, and a deformed dust seal 26 as a tertiary seal.

The first rod seal 23A, the second rod seal 23B, and the deformed dust seal 26 are sealing materials having a closed ring shape. The first rod seal 23A, the second rod seal 23B, and the deformed dust seal 26 are formed of an elastic member such as rubber. The first rod seal 23A, the second rod seal 23B, and the deformed dust seal 26 are provided on the outer peripheral surface 21a of the shaft 21.

The first rod seal 23A, the second rod seal 23B, and the deformed dust seal 26 are provided at a distance in the axial direction of the central axis 101. In the axial direction of the central shaft 101, the first rod seal 23A is provided on the liquid side space 60 side, and the deformed dust seal 26 is provided on the outer space 70 side. The second rod seal 23B is arranged between the first rod seal 23A and the deformed dust seal 26.

The housing 31 is formed with a first seal groove 38A, a second seal groove 38B, and a third seal groove 39. The first seal groove 38A, the second seal groove 38B, and the third seal groove 39 have a groove shape that is recessed from the inner peripheral surface 31b of the housing 31 and revolves around the central axis 101. The first seal groove 38A and the second seal groove 38B have a rectangular cross section. The third seal groove 39 has a rectangular cross section open to the outer space 70 side in the axial direction of the central axis 101.

The first rod seal 23A is housed in the first seal groove 38A, the second rod seal 23B is housed in the second seal groove 38B, and the deformed dust seal 26 is housed in the third seal groove 39. On the outer circumference of the shaft 21, an inter-seal space 65 is defined between the first rod seal 23A and the second rod seal 23B.

The first rod seal 23A has a sealing function for sealing the oil arranged in the liquid side space 60.

The modified dust seal 26 has a lip portion 27 (first lip portion), a lip portion 28 (second lip portion), and a base portion 29 as constituent parts thereof. The base 29 is installed in the third seal groove 39. The lip portion 27 and the lip portion 28 extend from the base portion 29 toward the shaft 21 and come into contact with the outer peripheral surface 21a of the shaft 21. In the axial direction of the central axis 101, the lip portion 27 is provided on the side of the space between seals 65, and the lip portion 28 is provided on the side of the external space 70.

The second rod seal 23B has a function of sealing the oil that has entered the inter-seal space 65 side from the liquid side space 60 into the inter-seal space 65 when the oil leaks from the first rod seal 23A. The deformed dust seal 26 has a function of preventing dust from entering from the external space 70 to the inter-seal space 65 side by the lip portion 28.

In the present embodiment, a seal material configuration is adopted in which the second rod seal 23B having a function of sealing oil and the irregular dust seal 26 having a function of preventing the invasion of dust are separated, but the second rod seal is used. It is also possible to adopt a configuration in which the 23B and the irregularly shaped dust seal 26 are shared by one seal member.

The housing 31 is formed with a recess 32 and a through hole 33. The recess 32 and the through hole 33 are defined between the first rod seal 23A and the second rod seal 23B in the axial direction of the central shaft 101. The recess 32 is recessed from the inner peripheral surface 31b of the housing 31 and has a shape that revolves around the central axis 101. The through hole 33 functions as a sensing port 33P.

The first block 120 is connected to the housing 31. The first block 120 is provided with a hole 120P that communicates with the through hole 33 of the housing 31. In the outlet region of the hole 120P, a first hydraulic pressure sensor 110 is provided as a first liquid information acquisition device for obtaining liquid information of the liquid located in the space 65 between seals through the sensing port 33P. The hydraulic pressure of the liquid located in the inter-seal space 65 measured by the first hydraulic pressure sensor 110 is sent to the control device 180.

A second block 170 is connected to the liquid side space 60 of the housing 31. The second block 170 is provided with an application port 170P communicating with the liquid side space 60. A hydraulic pressure application device 160 and a second hydraulic pressure sensor 150 as a second liquid information acquisition device for obtaining liquid information of the liquid located in the liquid side space 60 are connected to the application port 170P. The hydraulic pressure of the liquid located in the liquid side space 60 measured by the second hydraulic pressure sensor 150 is sent to the control device 180.

In the liquid leakage detection unit 100 having the above configuration, the liquid pressure of the liquid in each space measured by the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 is analyzed by the control device 180. Based on the analysis result, the seal state of the shaft 21 of the hydraulic cylinder 20 provided with the liquid leak detection unit 100 is determined to be one of "normal operation", "maintenance", and "stop use". In the discrimination, the calculation is performed based on the total usage time of the seal, the hydraulic pressure applied to the seal, the number of detections, and the hydraulic pressure of the liquid in the space.

The alert content indicates the replacement level in the order of "SAFETY" normal operation "" <"EXCHANGE" maintenance "" <DANGER "suspension of use". "SAFETY" normal operation "" means a state in which the sealing material can be used safely and with peace of mind.

"EXCHANGE" maintenance "" means that the sealing material can be used continuously, but maintenance should be performed from the start of maintenance preparation. "DANGER" suspension of use "" means a state in which the equipment should be stopped promptly and maintenance should be performed.

(Hydraulic device monitoring system 1000)
Next, the hydraulic device monitoring system 1000 will be described with reference to FIGS. 2 to 4. FIG. 2 is a diagram showing a schematic configuration of the hydraulic equipment monitoring system 1000, FIG. 3 is a configuration diagram of the hydraulic equipment monitoring system 1000, and FIG. 4 is a diagram showing the operation contents of the hydraulic equipment monitoring system.

The hydraulic device monitoring system 1000 can include one channel or two or more channels of the liquid leak detection unit 100. In the present embodiment, it is assumed that 8 channels (8 liquid leakage detection units 100) can be monitored, but the number of channels can be changed as appropriate.

The hydraulic equipment monitoring system 1000 includes eight liquid leak detection units 100, a system body 200, and a terminal 400. The terminal 400 is externally attached in order to reduce the size of the housing of the system main body 200. If the external capacity of the housing does not matter, the terminal 400 may be housed inside the housing of the system body 200.

The system main body 200 has a control device 180, a power button 210, a channel selection button 220, an alert display light 230, a reset button (return button) 240, a liquid crystal display 250, a buzzer 260, a buzzer stop button 270, and an internal memory 280. ..

The signals from the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 of the eight liquid leakage detection units 100 are input to the control device 180 via the terminal 400. The control device 180 monitors the hydraulic device of each channel based on this input signal.

Specifically, as described above, the hydraulic pressure and the number of detections of the liquid in each space measured by the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 are analyzed by the control device 180. Based on the analysis result, in each channel, the seal state of the shaft 21 provided with the liquid leakage detection unit 100 is one of "normal operation", "maintenance", and "suspension of use". To determine.

As described above, the control device 180 individually monitors the plurality of liquid leakage detection units 100. The control device 180 sends an alert corresponding to each channel in a stepwise manner. The contents of the alert are the change of the alert display light 230 as a display device (green ⇒ yellow ⇒ red), the display content on the liquid crystal display 250 (status change status and log), and the buzzer 260 as a sounding device (silence ⇒ silence ⇒). Intermittent sound ⇒ continuous sound).

As shown in FIG. 4, as for the operation contents by the control device 180, when the hydraulic cylinder 20 is in the "normal operation" state, the alert display light 230 is displayed in blue (normal operation lighting unit), and the liquid crystal display 250 is displayed. The display of "SAFTY" and the buzzer 260 are silenced. When the hydraulic cylinder 20 is in the "maintenance" state, the alert display light 230 is displayed in yellow (maintenance lighting unit), the liquid crystal display 250 is displayed as "EXCHANGE", and the buzzer 260 is an intermittent sound. When the hydraulic cylinder 20 is in the "stopped use" state, the alert display light 230 is displayed in red (the use stop lighting unit), the liquid crystal display 250 is displayed as "DANGER", and the buzzer 260 is a continuous sound.

The observer can easily recognize the state of the channel by making the tone when the buzzer 260 is operated different between the case where it is determined that the maintenance state is determined and the case where it is determined that the use is stopped. When the buzzer sounds, the observer can mute the sound by operating the buzzer stop button.

In addition to the system main body 200, alerts can be remotely monitored and alerts can be received by connecting the system main body 200 to an external operation panel 300 and a device monitoring room (not shown).

<Operation of system body 200>
First, the observer turns on the power by pressing the power button 210. As a result, the control device 180 starts monitoring. When a signal is received from the channel connected to the control device 180, the status is displayed. It also sends alerts as needed.

Specifically, in the control device 180, based on the signals obtained from the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150, the hydraulic equipment of the corresponding channel is operated normally, maintained, and stopped in use. Determine which state it is in (first step). After that, based on the judgment result of the first step, whether the hydraulic device of the channel corresponding to the alert display light 230 and the liquid crystal display 250, which are the display devices, is in normal operation, maintenance, or out of use is determined. Display (second step). The channel of the liquid crystal display 250 is switched by the channel selection button 220.

The liquid crystal display 250 displays the start date of normal operation, the start date and time of transition to maintenance, and the start date and time of transition to suspension of use for each channel. The status is not displayed for channels that are not connected, or channels that have no signal due to failure or disconnection.

When the alert state (“maintenance” or “suspension of use”) appears, it is displayed so as to jump to the target channel regardless of the display channel of the liquid crystal display 250. After the maintenance is performed, the target channel is displayed on the liquid crystal display 250. After that, the reset button 240 is pressed and held to return to the initial state and start monitoring.

The log (recorded data of the event) when the alert state is expressed may be stored in the internal memory 280. As a result, the recorded data stored in the internal memory 280 can be extracted and diagnosed by external access. The software of the system itself can be updated by external access.

(Other embodiments)
The hydraulic device monitoring system 1000 in another embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a cross-sectional view showing a state in which the configuration of the liquid leakage detection unit 100 adopted in the hydraulic device monitoring system 1000A in another embodiment is assembled to the shaft, and FIG. 7 is a cross-sectional view of the hydraulic device monitoring system 1000A. It is a figure which shows the schematic structure.

In the liquid leakage detection unit 100 described above, the transmission of signals between the first hydraulic pressure sensor 110 and the control device 180 and between the second hydraulic pressure sensor 150 and the control device 180 was a wired system. Even when the operation panel 300 is provided, the signal transmission between the operation panel 300 and the control device 180 is a wired system. On the other hand, in this liquid leakage detection unit 100A, a wireless system is used.

As the wireless communication means, for example, any one of Bluetooth (registered trademark), Zigbee (registered trademark) and wireless LAN may be applied.

Specifically, between the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 and the control device 180 that processes the measurement data obtained from the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150. Two-way communication is possible by wireless communication means, measurement is performed by the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 based on the measurement start signal from the control device 180, and these measurement data are sequentially controlled by the control device. Collected at 180.

There are a plurality of wireless networks constructed by the control device 180 and the plurality of first hydraulic pressure sensors 110 and the second hydraulic pressure sensor 150, and each wireless network is supported by one control device 180.

The control device 180 identifies and communicates with each of the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150, and has a predetermined unit number for each of the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150. Includes a unit number setting function to set and a unit setting file.

The control device 180 is the first from the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 existing in the wireless network constructed in the communication area for each communication area to which the radio wave of wireless communication reaches. For each of the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150, which have acquired the unique identifiers assigned to the first hydraulic pressure sensor 110 and the second hydraulic pressure sensor 150 in advance and acquired the identifiers by the unit number setting function. Set a predetermined unit number in, associate the set unit number with the identifier, and save it in the unit setting file. After that, read the unit setting file for each communication area, specify the unit number, and specify the number. Communication with the 1st hydraulic pressure sensor 110 and the 2nd hydraulic pressure sensor 150 is performed.

Further, even when the operation panel 300 is provided, the signal transmission between the operation panel 300 and the control device 180 is bidirectionally connected by wireless communication means.

As described above, according to the hydraulic device monitoring systems 1000 and 1000A in the present embodiment, it is possible to more accurately grasp the maintenance timing of the sealing material and prevent the occurrence of liquid leakage.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

20 Hydraulic cylinder, 21 shaft, 21a outer peripheral surface, 23A 1st rod seal, 23B 2nd rod seal, 26 deformed dust seal, 27,28 lip part, 29 base, 31 housing, 31b inner peripheral surface, 32 recesses, 33 through holes , 33P sensing port, 38A 1st seal groove, 38B 2nd seal groove, 39 3rd seal groove, 60 liquid side space, 65 inter-seal space, 70 external space, 100, 100A liquid leak detection unit, 101 central axis, 110 1st hydraulic pressure sensor, 120 1st block, 120P hole, 150 2nd hydraulic pressure sensor, 160 hydraulic pressure application device, 170 2nd block, 170P application port, 180 control device, 200 system body, 210 power button, 220 channel selection Button, 230 alert display light, 240 reset button, 250 liquid crystal display, 260 buzzer, 270 buzzer stop button, 280 internal memory, 300 operation panel, 400 terminal, 1000, 1000A hydraulic equipment monitoring system.

Claims (9)

Hydraulic equipment and
A hydraulic pressure sensor that monitors the hydraulic pressure inside the hydraulic pressure device, and
A display device that displays the status of the hydraulic device and
A return device that returns the state of the display device to the initial state, and
Control device and
With
The control device is
Based on the signal obtained from the hydraulic pressure sensor, the first step of determining whether the state is normal operation, maintenance, or suspension of use, and
Based on the determination result of the first step, the second step of displaying on the display device whether the state is normal operation, maintenance, or suspension of use,
Including hydraulic equipment monitoring system. The display device has a normal operation lighting unit, a maintenance lighting unit, and a use stop lighting unit.
The hydraulic device monitoring system according to claim 1, wherein the control device lights any one of the normal operation lighting unit, the maintenance lighting unit, and the use stop lighting unit based on the determination in the second step. .. The display device includes a display device.
The liquid according to claim 1 or 2, wherein the control device displays the start date of the normal operation, the shift start date and time for the maintenance, and the shift start date and time for the suspension of use on the display device. Pressure equipment monitoring system. Equipped with a sounding device
The hydraulic device monitoring system according to claim 3, wherein the control device operates the sounding device when it is determined that the maintenance is performed in the second step of the control device. The hydraulic device monitoring system according to claim 4, wherein the control device operates the sounding device when it is determined that the use is stopped in the two steps of the control device. The hydraulic device monitoring system according to claim 5, wherein the control device has different timbres when the sounding device is operated when it is determined that the maintenance is performed and when it is determined that the use is stopped. Including the plurality of the hydraulic devices including the hydraulic pressure sensor.
The control device executes the first step and the second step corresponding to each hydraulic device based on the signals obtained from the plurality of hydraulic sensors.
The hydraulic device monitoring system according to any one of claims 1 to 6. A signal is transmitted between the hydraulic pressure sensor and the control device by a wired method or a wireless method.
The hydraulic device monitoring system according to any one of claims 1 to 7. An operation panel is provided outside,
A signal is transmitted between the operation panel and the control device by a wired method or a wireless method.
The hydraulic device monitoring system according to any one of claims 1 to 8.

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