CN111379766A - State monitoring device and fluid pressure driving device - Google Patents
State monitoring device and fluid pressure driving device Download PDFInfo
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- CN111379766A CN111379766A CN201911180785.4A CN201911180785A CN111379766A CN 111379766 A CN111379766 A CN 111379766A CN 201911180785 A CN201911180785 A CN 201911180785A CN 111379766 A CN111379766 A CN 111379766A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/855—Testing of fluid pressure systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/857—Monitoring of fluid pressure systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Fluid-Pressure Circuits (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a state monitoring device and a fluid pressure driving device. The degree of wear of a movable part such as a spool is easily and accurately checked. The fluid pressure driving device includes: a 1 st information acquiring unit that acquires a position of a 1 st movable portion of a flow rate control valve that controls an ejection rate of a working fluid according to the position of the 1 st movable portion; a 2 nd information acquiring unit that acquires a position of a 2 nd movable part of an actuator having the 2 nd movable part that moves in position in accordance with the working fluid discharged from the flow rate control valve; a state determination unit configured to determine whether or not the position of the 1 st movable unit acquired by the 1 st information acquisition unit is a neutral position at which the supply of the working fluid to the actuator is stopped; and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
Description
Technical Field
The present application is based on Japanese patent application (Japanese patent application 2018-246007, application date: 12/27/2018) and has a priority interest from the application. The reference to the wish includes the entire contents of the wish.
The present invention relates to a condition monitoring device and a fluid pressure driving device.
Background
As one of the failures of the flow control valve that controls the discharge amount of the hydraulic oil, there is hydraulic oil leakage caused by wear of a spool (also referred to as a spool) of the flow control valve. In general, the spool must reliably seal the hydraulic oil when it is at the neutral position, and when the spool moves from the neutral position, the hydraulic oil is discharged.
However, when foreign matter is mixed into the hydraulic oil in the flow rate control valve, the surface of the spool is cut by the foreign matter, and there is a possibility that the hydraulic oil leaks from a gap generated by abrasion of the spool even if the spool moves to the neutral position.
Even if the spool moves to the neutral position and the hydraulic oil leaks, this causes the drive unit driven by the flow rate control valve or the actuator controlled by the drive unit to malfunction. Further, if the leakage amount of the hydraulic oil becomes too large, the supply of the hydraulic oil becomes insufficient, and a sufficient hydraulic pressure cannot be obtained, thereby reducing the efficiency of the drive unit and the actuator.
It is preferable to investigate the degree of wear of the spool without disassembling the flow control valve, since maintenance costs can be reduced.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-50785
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the problem of providing a state monitoring device and a fluid pressure driving device capable of easily and accurately checking the degree of wear of a movable portion such as a spool.
Means for solving the problems
In order to solve the above-described problems, one aspect of the present invention provides a state monitoring device including:
a 1 st information acquiring unit that acquires a position of a 1 st movable portion of a flow rate control valve that controls an ejection rate of a working fluid according to the position of the 1 st movable portion;
a 2 nd information acquiring unit that acquires a position of a 2 nd movable part of an actuator having the 2 nd movable part that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a state determination unit configured to determine whether or not the position of the 1 st movable unit acquired by the 1 st information acquisition unit is a neutral position at which the supply of the working fluid to the actuator is stopped; and
and a state estimating unit configured to estimate a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
The state monitoring device may further include a detection unit that detects that the 1 st movable unit is located at the neutral position at which the supply of the working fluid to the actuator is stopped,
when the detection unit detects that the position is at the neutral position, the state determination unit determines that the position of the 1 st movable unit is at the neutral position.
The state monitoring device may further include a detection unit for detecting a command for moving the 1 st movable unit to the neutral position,
when the command is detected by the detection unit, the state determination unit determines that the position of the 1 st movable unit is the neutral position.
In another aspect of the present invention, there is provided a fluid pressure driving apparatus including:
a flow rate control valve for controlling the discharge rate of the working fluid according to the position of the 1 st movable part;
an actuator having a 2 nd movable portion that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a position detection unit that detects a position of the 2 nd movable unit; and
and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit in a state where supply of the working fluid from the flow rate control valve to the actuator is stopped, the displacement per unit time of the 2 nd movable unit being calculated based on the position of the 2 nd movable unit detected by the position detecting unit.
The displacement may be at least one of a displacement speed of the 2 nd movable part and a time from when the command to stop the 2 nd movable part at the predetermined position is received to when the 2 nd movable part starts moving.
The fluid pressure driving device may include a warning unit configured to give a predetermined warning when the displacement exceeds a predetermined threshold value.
The fluid pressure driving device may further include a lifetime prediction unit that predicts a lifetime of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimation unit over a predetermined period.
The actuator may be disposed along a vertical direction,
the 2 nd movable part descends by its own weight in a state where the 2 nd movable part receives a command to stop the 2 nd movable part at a predetermined position and the supply of the working fluid from the flow rate control valve to the actuator is stopped.
In the state estimation of the 1 st movable unit, the displacement of the 2 nd movable unit may be detected after the 1 st movable unit is moved to a position at which the supply of the working fluid from the flow rate control valve to the actuator is stopped.
The actuator may be a valve that controls the supply amount of the working fluid to another actuator driven by the working fluid supplied from the actuator, according to the position of the 2 nd movable part.
The fluid pressure driving apparatus may further include a mode selection unit capable of selecting a test mode for estimating the state of the 1 st movable unit,
when the test mode is selected by the mode selection unit, the state estimation unit estimates the state of the 1 st movable unit in a state in which the 1 st movable unit is moved to the neutral position after the 2 nd movable unit is moved to the neutral position and the control for feeding back the position information of the 2 nd movable unit to the flow rate control valve is stopped.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the degree of wear of a movable portion such as a spool can be easily and accurately checked.
Drawings
Fig. 1 is a block diagram showing a schematic configuration of a fluid pressure driving apparatus including a condition monitoring device according to embodiment 1.
Fig. 2 is a block diagram showing a schematic configuration of a fluid pressure driving apparatus according to embodiment 2.
Fig. 3 (a) and 3 (b) are diagrams showing examples in which paths of leakage of the working oil are different from each other.
Fig. 4 is a diagram showing a schematic configuration of a fluid pressure driving apparatus according to embodiment 3.
Fig. 5 is a diagram showing a schematic configuration of a fluid pressure driving apparatus according to embodiment 4.
Description of the reference numerals
1. A fluid pressure driving device; 2. a flow control valve; 3. an actuator; 3a, a sleeve; 3b, a movable part; 4. a displacement detection unit; 5. a state estimating unit; 6. a controller; 7. a position detection unit; 8. a fuel injection valve; 9. an exhaust valve; 10. a position detection unit; 11. a warning unit; 12. a life prediction unit; 13. a mode selection unit.
Detailed Description
Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the aspect ratio are appropriately changed and exaggerated with respect to the actual scale, the aspect ratio, and the like for convenience of illustration and understanding. In addition, terms such as "parallel", "orthogonal" and "identical", a value of a length, a value of an angle, and the like, which are used in the present specification and define conditions of shapes and geometries and a degree of specifying them, are not limited to strict meanings, and are to be interpreted to include a range of degrees to which the same function can be expected. Hereinafter, embodiments of the present invention will be described in detail.
(embodiment 1)
Fig. 1 is a block diagram showing a schematic configuration of a fluid pressure driving apparatus 1 including a condition monitoring device 15 according to embodiment 1. The fluid pressure driving device 1 of fig. 1 includes: a flow control valve 2, an actuator 3, and a condition monitoring device 15.
The flow rate control valve 2 includes a stem 2b, and the stem 2b has 1 or more spool 2a (1 st movable part). The flow rate control valve 2 moves the valve stem 2b and moves the spool 2a to a desired position in response to a command from the controller 6. The valve stem 2b is controlled to move left and right along the drawing by a current flowing through an electromagnetic coil, not shown, for example. Further, the valve rod 2b does not necessarily need to be moved by electric control such as an electromagnetic coil, and the valve rod 2b may be moved by another control method (for example, hydraulic control). One of the moving positions of the spool 2a is a neutral position. When the spool 2a moves to the neutral position, both the hydraulic oil flowing into the flow rate control valve 2 and the hydraulic oil flowing out of the flow rate control valve 2 are blocked. Therefore, when the flow of the working oil between the flow rate control valve 2 and the actuator 3 is to be sealed, the controller 6 issues a command to move the spool 2a to the neutral position.
The controller 6 may detect the position of the spool 2a based on a detection signal of the position detection unit 7 that detects the position of the stem 2b of the flow rate control valve 2, and perform feedback control so that the detected position of the spool 2a matches a predetermined target position. The target position refers to a command position of the controller 6.
The flow rate control valve 2 of fig. 1 is provided with a plurality of ports into which and from which hydraulic oil flows, and the inflow and outflow of hydraulic oil to and from each port is controlled in accordance with the position of the spool 2 a. For example, the flow control valve 2 has: a port P1 into which hydraulic oil from the actuator 3 flows, a port P2 through which hydraulic oil is supplied from the flow control valve 2 to the actuator 3, and a port P3 through which hydraulic oil is discharged from the flow control valve 2 to the tank. The type and number of ports provided in the flow rate control valve 2 are arbitrary.
The actuator 3 has a movable portion (2 nd movable portion) 3b movable within, for example, a hollow sleeve 3 a. The actuator 3 varies the position of the movable portion 3b according to the discharge amount of the hydraulic oil from the flow rate control valve 2. Fig. 1 shows an example in which the fuel injection valve 8 and the exhaust valve 9 are controlled by the movement of the movable portion 3b in the actuator 3, but this is an example and the object to be driven by the actuator 3 is arbitrary.
The actuator 3 may include a position detection unit 10 that detects the position of the movable unit 3 b. The position detection unit 10 is disposed on, for example, one end side of the movable unit 3b, and detects a distance to the movable unit 3b in a non-contact manner.
The state monitoring device 15 includes: a 1 st information acquiring unit 16, a 2 nd information acquiring unit 17, a state judging unit 18, and a state estimating unit 5. The state monitoring device 15 may also include a command detection unit 19. The 1 st information acquiring unit 16, the 2 nd information acquiring unit 17, the state judging unit 18, and the state estimating unit 5 may be incorporated in the controller 6.
The 1 st information acquiring unit 16 acquires the position of the spool 2a in the flow rate control valve 2, and the flow rate control valve 2 controls the discharge rate of the working fluid in accordance with the position of the spool (the 1 st movable portion) 2 a.
The 2 nd information acquiring unit 17 acquires the position of the movable portion 3b in the actuator 3, and the actuator 3 includes a movable portion (2 nd movable portion) 3b that moves the position in accordance with the working fluid discharged from the flow rate control valve 2.
The state determination unit 18 determines whether or not the position of the spool 2a acquired by the 1 st information acquisition unit 16 is a neutral position at which the supply of the working fluid to the actuator 3 is stopped.
The state estimating unit 5 estimates the state of the spool 2a based on the displacement per unit time of the movable portion 3b when the state determining unit 18 determines that the position of the spool 2a is the neutral position.
The position detection unit 7 can detect that the spool 2a is located at a neutral position at which the supply of the working fluid to the actuator 3 is stopped. Therefore, the state determination unit 18 may determine that the position of the spool 2a is the neutral position when the position detection unit 7 detects that the spool is located at the neutral position.
The command detection unit 19 can detect a command for moving the spool 2a to the neutral position. Therefore, the state determination unit 18 may determine that the position of the spool 2a is the neutral position when the command is detected by the command detection unit 19.
In this way, the state monitoring device 15 of fig. 1 estimates the state of the spool 2a based on the displacement of the movable portion 3b of the actuator 3 when the spool 2a is at the neutral position, and therefore, even if the flow rate control valve 2 is not disassembled to take out the spool 2a, the degree of wear of the spool 2a can be accurately determined.
(embodiment 2)
Fig. 2 is a block diagram showing a schematic configuration of the fluid pressure driving device 1 according to embodiment 2. The fluid pressure driving device 1 of fig. 2 includes: a flow rate control valve 2, an actuator 3, a displacement detection unit 4, and a state estimation unit 5. The state estimating unit 5 constitutes, for example, a part of the controller 6.
The flow rate control valve 2 and the actuator 3 in fig. 2 are the same as the flow rate control valve 2 and the actuator 3 in fig. 1, and detailed description thereof is omitted.
The displacement detecting unit 4 detects the displacement of the movable unit 3b in the actuator 3. Here, the displacement is at least one of the displacement speed of the movable portion 3b and the time from when the movable portion 3b receives the movement command to when the movement starts. For example, when the position detection unit 10 that detects the position of the movable unit 3b is provided, the displacement detection unit 4 can detect the displacement speed of the movable unit 3b by performing differential processing on the position of the movable unit 3b detected by the position detection unit 10. Alternatively, the displacement detecting unit 4 may include a speed sensor that directly detects the displacement speed of the movable unit 3 b.
The state estimating unit 5 estimates the state of the spool (1 st movable portion) 2a based on the displacement per unit time of the movable portion 3b in a state where the supply of the working fluid from the flow rate control valve 2 to the actuator 3 is stopped, the displacement per unit time of the movable portion 3b being calculated based on the position of the movable portion (2 nd movable portion) 3b detected by the position detecting unit 10. The displacement is at least one of the displacement speed of the movable portion 3b and the time from the reception of the command to stop the movable portion 3b at the predetermined position to the start of movement. More specifically, the state estimating unit 5 estimates the state of the spool 2a of the flow rate control valve 2 based on the displacement detected by the displacement detecting unit 4. When the spool 2a is in the neutral position, the flow rate control valve 2 seals the hydraulic oil, and therefore, the inflow and outflow of the hydraulic oil should not occur between the flow rate control valve 2 and the actuator 3. However, when the spool 2a is worn, the hydraulic oil leaks from the clearance of the spool 2a even when the spool 2a is at the neutral position, as indicated by the arrow in fig. 3 (a) or 3 (b). As shown in fig. 3 (a) and 3 (b), it is conceivable that the direction of the hydraulic oil leakage also changes depending on the location where the spool 2a is worn. Depending on the direction in which the working oil leaks, a force to lift up the movable part 3b of the actuator 3 is made to act, or a force to lower down the movable part 3b of the actuator 3 is made to act. The displacement of the movable portion 3b may be detected after the spool 2a is moved to a position at which the supply of the working fluid from the flow rate control valve 2 to the actuator 3 is stopped.
For example, as shown in fig. 2, when the actuator 3 is disposed in a direction in which the movable portion 3b moves in the vertical direction, the movable portion 3b inherently drops downward at a constant speed due to its own weight when the spool 2a of the flow rate control valve 2 is located at the neutral position. On the other hand, when the spool 2a is worn, the drop speed of the movable portion 3b changes because the hydraulic oil leaks from the clearance of the spool 2a to the actuator 3 side even if the spool 2a is located at the neutral position. For example, when the hydraulic oil leaks in the direction of fig. 3 (a), the falling speed of the movable portion 3b becomes faster. On the other hand, when the hydraulic oil leaks in the direction of fig. 3 (b), the falling speed of the movable portion 3b becomes slower.
When receiving a command to move the spool 2a of the flow rate control valve 2 to the neutral position, the displacement of the movable portion 3b of the actuator 3 is detected, and it is possible to determine whether or not the spool 2a is worn. Therefore, for example, when the displacement speed of the movable portion 3b is different from a previously assumed displacement speed, the state estimating unit 5 estimates that the spool 2a is worn. Further, since the displacement speed of the movable portion 3b changes more greatly as the degree of wear of the spool 2a increases, the degree of wear of the spool 2a can also be estimated from the displacement speed of the movable portion 3 b.
The fluid pressure driving device 1 of fig. 2 may include a warning unit 11 shown by a broken line. When the state estimating unit 5 determines that the displacement of the spool 2a exceeds a predetermined threshold value, the warning unit 11 performs a predetermined warning process. The specific content of the warning process is arbitrary, and for example, a warning signal may be transmitted to a management server or the like, not shown, that manages the flow rate control valve 2 via a wireless network or a wired network, and the warning content may be displayed on a display device such as the management server. Alternatively, a display device or a speaker connected to the flow rate control valve 2 may be used to display the warning content or output a sound. An example of the warning content may be content that urges the spool 2a to be repaired.
As described above, in embodiment 2, when a command to move the spool 2a of the flow rate control valve 2 to the neutral position is received, the displacement of the movable portion 3b of the actuator 3 is detected, and the detected displacement is compared with the displacement when the spool 2a is not worn, so that it is possible to determine whether or not the spool 2a is worn, that is, whether or not the leakage of the hydraulic oil has occurred when the spool 2a is located at the neutral position. Further, the degree of wear of the spool 2a, that is, the amount of leakage of the hydraulic oil can also be estimated from the magnitude of the displacement of the movable portion 3 b.
(embodiment 3)
Embodiment 3 is an embodiment for predicting the life of the spool 2a of the flow rate control valve 2 based on the state estimated by the state estimation unit 5.
Fig. 4 is a diagram showing a schematic configuration of the fluid pressure driving device 1 according to embodiment 3. The fluid pressure driving device 1 of fig. 4 includes a life prediction unit 12 in addition to the configuration of fig. 2.
The life predicting unit 12 predicts the life of the spool 2a based on the state of the spool 2a of the flow rate control valve 2 estimated by the state estimating unit 5 over a predetermined period. In general, the spool 2a gradually wears during use, and therefore the amount of hydraulic oil that leaks when the spool 2a is located at the neutral position is expected to gradually increase. However, if foreign matter contained in the hydraulic oil bites into the spool 2a, the amount of leakage of the hydraulic oil may increase rapidly. As the amount of leakage of the hydraulic oil increases, the displacement of the movable portion 3b of the actuator 3 also increases.
The displacement of the spool 2a is determined to reach the life of the spool 2a when the displacement reaches a large value, which differs depending on the type, application, and the like of the flow rate control valve 2. Therefore, the life prediction unit 12 may provide a threshold value for determining that the life of the spool 2a is reached. For example, the life prediction unit 12 may determine that the life of the spool 2a is reached when the displacement speed of the spool 2a exceeds a threshold value.
The life predicting unit 12 may determine that the life of the spool 2a is reached at a time point when a sign that the amount of leakage of the hydraulic oil is rapidly increased is found. More specifically, the following tendency may be present: as time passes, the displacement speed of the spool 2a increases substantially linearly, but the slope of the increase in displacement speed becomes larger with a certain point in time as a boundary, and in this case, it is determined that the life of the spool 2a has been reached at that point in time.
As described above, it is conceivable that the various lifetime prediction units 12 determine that the lifetime of the spool 2a is the standard, but it is desirable that, when it is determined that the lifetime is reached, the replacement timing of the spool 2a is reported by some means. As with the warning process performed by the warning unit 11 of fig. 2, various methods are conceivable for the method of reporting.
The life predicting unit 12 may report that the life is approaching before the spool 2a reaches the life, and in this case, may provide information on when the life is reached.
As described above, in embodiment 3, since the life predicting unit 12 that predicts the life of the spool 2a based on the state estimated by the state estimating unit 5 is provided, it is possible to prevent a problem that a large amount of hydraulic oil leaks during use of the flow rate control valve 2. Further, even if the flow rate control valve 2 is not disassembled and the spool 2a itself is inspected, the replacement timing of the spool 2a can be grasped, and therefore, the maintenance and management cost of the flow rate control valve 2 can be reduced.
(embodiment 4)
Fig. 5 is a diagram showing a schematic configuration of the fluid pressure driving device 1 according to embodiment 4. In addition to the configuration of fig. 4, the fluid pressure driving apparatus 1 of fig. 5 is provided with a mode selection unit 13 in the controller 6. In addition, the fluid pressure driving apparatus 1 according to embodiment 4 may be provided with a mode selection unit 13 in the configuration of fig. 2.
The mode selection unit 13 in the controller 6 can select any one of a plurality of operation modes. One of the plurality of operation modes is a state estimation mode for estimating the state of the spool 2 a. What operation mode is set depends on the structure and operation of the actuator 3, in addition to the state estimation mode. In the present embodiment, the operation of the fluid pressure drive apparatus 1 when the state estimation mode is selected by the controller 6 will be described.
When the controller 6 selects the state estimation mode, the controller 6 issues a command to move the spool 2a of the flow rate control valve 2 to the neutral position. In a state where the spool 2a moves to the neutral position in accordance with the command, the displacement detection unit 4 detects the displacement of the movable portion 3b of the actuator 3, and the state estimation unit 5 estimates the state of the spool 2a based on the detected displacement. When the test mode is selected by the mode selection unit 13, the state estimation unit 5 may estimate the state of the spool 2a in a state in which the spool 2a is moved to the neutral position after the movable portion 3b is moved to the neutral position and the control for feeding back the position information of the movable portion 3b to the flow rate control valve 2 is stopped.
The operation mode of the flow rate control valve 2 can be selected by, for example, a button operation or a touch operation, which is not shown. Therefore, the operator can select the state estimation mode with a simple operation. When the operator selects the state estimation mode, the spool 2a automatically moves to the neutral position, and the state of the spool 2a can be estimated by detecting the displacement of the movable portion 3b of the actuator 3.
As described above, in embodiment 4, since the operation mode for estimating the state of the spool 2a is provided, if the operator selects the operation mode, the spool 2a automatically moves to the neutral position, the displacement of the movable portion 3b of the actuator 3 is detected, and the state of the spool 2a can be estimated based on the detected displacement. This can save labor and time for the operator, and can check the wear state of the spool 2a at any time as needed. Therefore, the wear abnormality of the spool 2a can be detected before the life of the spool 2a is reached.
In the above embodiments, the fluid pressure drive apparatus 1 including the flow rate control valve 2 and the actuator 3 has been described, but since the actuator 3 is arbitrary in structure and operation, it can be widely applied to the fluid pressure drive apparatus 1 that performs various operations using the hydraulic oil discharged from the flow rate control valve 2. The flow rate control valve 2 may have a spool 2a and control the discharge rate of the hydraulic oil according to the position of the spool 2 a. Specific examples of the flow rate control valve 2 other than the spool valve described above can be applied to a poppet valve, a ball valve, a needle valve, and the like. The actuator 3 is an actuator having a movable portion 3b capable of changing its position according to the discharge amount of the hydraulic oil from the flow rate control valve 2 and directly driving an actuator shaft according to the position of the movable portion 3b, and the movable portion 3b may be a valve for controlling the supply amount of the hydraulic oil to the actuator 3 provided separately according to the position. A specific example of the driving portion may be a spool valve, a poppet valve, or a fluid pressure driving motor such as a hydraulic motor, in addition to the movable portion 3b type actuator 3 described above.
The technical ideas of the above embodiments can be summarized as (1) to (11) below.
(1) A condition monitoring device is provided with:
a 1 st information acquiring unit that acquires a position of a 1 st movable portion of a flow rate control valve that controls an ejection rate of a working fluid according to the position of the 1 st movable portion;
a 2 nd information acquiring unit that acquires a position of a 2 nd movable part of an actuator having the 2 nd movable part that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a state determination unit configured to determine whether or not the position of the 1 st movable unit acquired by the 1 st information acquisition unit is a neutral position at which the supply of the working fluid to the actuator is stopped; and
and a state estimating unit configured to estimate a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
(2) The condition monitoring device according to (1), wherein,
the state monitoring device includes a detection unit that detects that the 1 st movable unit is located at the neutral position at which the supply of the working fluid to the actuator is stopped,
when the detection unit detects that the position is at the neutral position, the state determination unit determines that the position of the 1 st movable unit is at the neutral position.
(3) The condition monitoring device according to (1), wherein,
the state monitoring device comprises a detection unit for detecting a command for moving the 1 st movable unit to the neutral position,
when the command is detected by the detection unit, the state determination unit determines that the position of the 1 st movable unit is the neutral position.
(4) A fluid pressure driving device includes:
a flow rate control valve for controlling the discharge rate of the working fluid according to the position of the 1 st movable part;
an actuator having a 2 nd movable portion that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a position detection unit that detects a position of the 2 nd movable unit; and
and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit in a state where supply of the working fluid from the flow rate control valve to the actuator is stopped, the displacement per unit time of the 2 nd movable unit being calculated based on the position of the 2 nd movable unit detected by the position detecting unit.
(5) The fluid pressure drive apparatus according to (4), wherein,
the displacement is at least one of a displacement speed of the 2 nd movable part and a time from when a command to stop the 2 nd movable part at a predetermined position is received to when the 2 nd movable part starts moving.
(6) The fluid pressure drive apparatus according to (4) or (5), wherein,
the fluid pressure driving device includes a warning unit that gives a predetermined warning when the displacement exceeds a predetermined threshold value.
(7) The fluid pressure drive apparatus according to any one of (4) to (6), wherein,
the fluid pressure driving device includes a lifetime prediction unit that predicts a lifetime of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimation unit over a predetermined period.
(8) The fluid pressure drive apparatus according to any one of (4) to (7), wherein,
the actuators are arranged along the vertical direction,
the 2 nd movable part descends by its own weight in a state where the 2 nd movable part receives a command to stop the 2 nd movable part at a predetermined position and the supply of the working fluid from the flow rate control valve to the actuator is stopped.
(9) The fluid pressure drive apparatus according to any one of (4) to (8), wherein,
when estimating the state of the 1 st movable part, the displacement of the 2 nd movable part is detected after the 1 st movable part is moved to a position at which the supply of the working fluid from the flow rate control valve to the actuator is stopped.
(10) The fluid pressure drive apparatus according to any one of (4) to (9), wherein,
the actuator is a valve that controls the supply amount of the working fluid to another actuator driven by the working fluid supplied from the actuator, according to the position of the 2 nd movable part.
(11) The fluid pressure drive apparatus according to any one of (4) to (10), wherein,
the fluid pressure driving device comprises a mode selection unit capable of selecting a test mode for estimating the state of the 1 st movable unit,
when the test mode is selected by the mode selection unit, the state estimation unit estimates the state of the 1 st movable unit in a state in which the 1 st movable unit is moved to the neutral position after the 2 nd movable unit is moved to the neutral position and the control for feeding back the position information of the 2 nd movable unit to the flow rate control valve is stopped.
The present invention is not limited to the above embodiments, and may be modified by various modifications that can be made by those skilled in the art. That is, various additions, modifications, and partial deletions can be made without departing from the concept and gist of the present invention derived from the contents and equivalents thereof defined in the claims.
Claims (11)
1. A condition monitoring device, wherein,
the state monitoring device includes:
a 1 st information acquiring unit that acquires a position of a 1 st movable portion of a flow rate control valve that controls an ejection rate of a working fluid according to the position of the 1 st movable portion;
a 2 nd information acquiring unit that acquires a position of a 2 nd movable part of an actuator having the 2 nd movable part that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a state determination unit configured to determine whether or not the position of the 1 st movable unit acquired by the 1 st information acquisition unit is a neutral position at which the supply of the working fluid to the actuator is stopped; and
and a state estimating unit configured to estimate a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
2. The condition monitoring device according to claim 1,
the state monitoring device includes a detection unit that detects that the 1 st movable unit is located at the neutral position at which the supply of the working fluid to the actuator is stopped,
when the detection unit detects that the position is at the neutral position, the state determination unit determines that the position of the 1 st movable unit is at the neutral position.
3. The condition monitoring device according to claim 1,
the state monitoring device comprises a detection unit for detecting a command for moving the 1 st movable unit to the neutral position,
when the command is detected by the detection unit, the state determination unit determines that the position of the 1 st movable unit is the neutral position.
4. A fluid pressure driving apparatus in which, in a fluid pressure driving apparatus,
the fluid pressure driving device includes:
a flow rate control valve for controlling the discharge rate of the working fluid according to the position of the 1 st movable part;
an actuator having a 2 nd movable portion that moves in position in accordance with the working fluid discharged from the flow rate control valve;
a position detection unit that detects a position of the 2 nd movable unit; and
and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement per unit time of the 2 nd movable unit in a state where supply of the working fluid from the flow rate control valve to the actuator is stopped, the displacement per unit time of the 2 nd movable unit being calculated based on the position of the 2 nd movable unit detected by the position detecting unit.
5. A fluid pressure drive apparatus as claimed in claim 4 wherein,
the displacement is at least one of a displacement speed of the 2 nd movable part and a time from when a command to stop the 2 nd movable part at a predetermined position is received to when the 2 nd movable part starts moving.
6. The fluid pressure drive apparatus according to claim 4 or 5,
the fluid pressure driving device includes a warning unit that gives a predetermined warning when the displacement exceeds a predetermined threshold value.
7. The fluid pressure drive apparatus according to claim 4 or 5,
the fluid pressure driving device includes a lifetime prediction unit that predicts a lifetime of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimation unit over a predetermined period.
8. The fluid pressure drive apparatus according to claim 4 or 5,
the actuators are arranged along the vertical direction,
the 2 nd movable part descends by its own weight in a state where the 2 nd movable part receives a command to stop the 2 nd movable part at a predetermined position and the supply of the working fluid from the flow rate control valve to the actuator is stopped.
9. The fluid pressure drive apparatus according to claim 4 or 5,
when estimating the state of the 1 st movable part, the displacement of the 2 nd movable part is detected after the 1 st movable part is moved to a position at which the supply of the working fluid from the flow rate control valve to the actuator is stopped.
10. The fluid pressure drive apparatus according to claim 4 or 5,
the actuator is a valve that controls the supply amount of the working fluid to another actuator driven by the working fluid supplied from the actuator, according to the position of the 2 nd movable part.
11. The fluid pressure drive apparatus according to claim 4 or 5,
the fluid pressure driving device comprises a mode selection unit capable of selecting a test mode for estimating the state of the 1 st movable unit,
when the test mode is selected by the mode selection unit, the state estimation unit estimates the state of the 1 st movable unit in a state in which the 1 st movable unit is moved to the neutral position after the 2 nd movable unit is moved to the neutral position and the control for feeding back the position information of the 2 nd movable unit to the flow rate control valve is stopped.
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| JP2018-246007 | 2018-12-27 | ||
| JP2018246007A JP7254509B2 (en) | 2018-12-27 | 2018-12-27 | Condition monitoring device and hydraulic drive device |
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| CN111379766B CN111379766B (en) | 2023-06-23 |
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| JP (1) | JP7254509B2 (en) |
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| JP7316055B2 (en) * | 2019-02-12 | 2023-07-27 | ナブテスコ株式会社 | HYDRAULIC SERVOVALVE STATE DIAGNOSIS METHOD AND HYDRAULIC SERVOVALVE SYSTEM |
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| KR20210104628A (en) | 2021-08-25 |
| CN111379766B (en) | 2023-06-23 |
| JP2020106419A (en) | 2020-07-09 |
| KR102470124B1 (en) | 2022-11-25 |
| JP7254509B2 (en) | 2023-04-10 |
| KR20200081228A (en) | 2020-07-07 |
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