CN111379766B - State monitoring device and fluid pressure driving device - Google Patents
State monitoring device and fluid pressure driving device Download PDFInfo
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- CN111379766B CN111379766B CN201911180785.4A CN201911180785A CN111379766B CN 111379766 B CN111379766 B CN 111379766B CN 201911180785 A CN201911180785 A CN 201911180785A CN 111379766 B CN111379766 B CN 111379766B
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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 the movable portion such as the spool is simply and accurately examined. The fluid pressure driving device is provided with: a 1 st information acquisition unit that acquires a 1 st movable portion position of a flow control valve that controls a discharge amount of a working fluid based on the 1 st movable portion position; a 2 nd information acquisition unit that acquires a position of a 2 nd movable unit of an actuator having the 2 nd movable unit that moves in position according to the working fluid discharged from the flow control valve; a state determination unit that determines 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 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 of the 2 nd movable unit per unit time 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), from which priority is enjoyed. The whole content of the release is included by referring to the release.
The present invention relates to a state 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 a hydraulic oil leakage caused by wear of a spool (also referred to as a spool) of the flow control valve. In this case, the spool must be reliably sealed when in the neutral position, and when the spool moves from the neutral position, the working oil is discharged.
However, when foreign matter is mixed in the hydraulic oil in the flow control valve, the surface of the spool is cut by the foreign matter, and even if the spool moves to the neutral position, the hydraulic oil may leak from a gap generated by wear of the spool.
Even if the spool moves to the neutral position, the working oil leaks, which causes malfunction of the drive unit driven by the flow control valve and the actuator controlled by the drive unit. If the amount of leakage of the hydraulic oil becomes excessive, the hydraulic oil is not supplied sufficiently, and the efficiency of the driving unit and the actuator is lowered.
It is preferable to examine the degree of wear of the spool without disassembling the flow control valve, because maintenance costs can be reduced.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication 2016-50785
Disclosure of Invention
Problems to be solved by the invention
The invention provides a state monitoring device and a fluid pressure driving device capable of simply and accurately investigating the degree of abrasion of a movable part such as a spool.
Solution for solving the problem
In order to solve the above-described problems, an aspect of the present invention provides a state monitoring device including:
a 1 st information acquisition unit that acquires a 1 st movable portion position of a flow control valve that controls a discharge amount of a working fluid based on the 1 st movable portion position;
a 2 nd information acquisition unit that acquires a position of a 2 nd movable unit of an actuator having the 2 nd movable unit that moves in position according to the working fluid discharged from the flow control valve;
a state determination unit that determines 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 supply of the working fluid to the actuator is stopped; and
and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement of the 2 nd movable unit per unit time when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
The state monitoring device may include a detection unit that detects that the 1 st movable portion is located at the neutral position where the supply of the working fluid to the actuator is stopped,
when the detection unit detects that the position is located at the neutral position, the state determination unit determines that the position of the 1 st movable unit is the neutral position.
The state monitoring device may include a detection unit that detects a command to move 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 device including:
a flow control valve for controlling the discharge amount 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 according to the working fluid ejected from the flow 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 portion based on a displacement of the 2 nd movable portion per unit time in a state in which the supply of the working fluid from the flow rate control valve to the actuator is stopped, the displacement of the 2 nd movable portion per unit time being calculated from the position of the 2 nd movable portion detected by the position detecting unit.
The displacement may be at least one of a displacement speed of the 2 nd movable portion and a time from receiving a command to stop the 2 nd movable portion at a predetermined position to starting movement.
The fluid pressure driving device may include a warning unit that gives a predetermined warning when the displacement exceeds a predetermined threshold value.
The fluid pressure driving device may further include a life predicting unit that predicts the life of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimating unit over a predetermined period.
The actuator may be arranged along a vertical direction,
the 2 nd movable portion is lowered by its own weight in a state in which the 2 nd movable portion is stopped from supplying the working fluid from the flow control valve to the actuator upon receiving a command to stop the 2 nd movable portion at a predetermined position.
In the state estimation of the 1 st movable portion, the displacement of the 2 nd movable portion may be detected after the 1 st movable portion is moved to a position where the supply of the working fluid from the flow control valve to the actuator is stopped.
The actuator may be a valve that controls the supply amount of the working fluid to other actuators driven by the working fluid supplied from the actuator, based on the position of the 2 nd movable portion.
The fluid pressure driving device may further include a mode selection unit configured to select a test mode for estimating a 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 and the control in which the feedback of the position information of the 2 nd movable unit to the flow control valve is stopped after the 2 nd movable unit is moved to the neutral position.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the degree of wear of the movable portion such as the spool can be easily and accurately examined.
Drawings
Fig. 1 is a block diagram showing a schematic configuration of a fluid pressure driving device including a state monitoring device according to embodiment 1.
Fig. 2 is a block diagram showing a schematic configuration of the fluid pressure drive device according to embodiment 2.
Fig. 3 (a) and 3 (b) are diagrams showing examples in which the paths of leakage of the working oil are different from each other.
Fig. 4 is a diagram showing a schematic configuration of the fluid pressure drive device according to embodiment 3.
Fig. 5 is a diagram showing a schematic configuration of the fluid pressure drive device 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 lifetime prediction unit; 13. a mode selection part.
Detailed Description
An embodiment of the present disclosure will be described below with reference to the drawings. In the drawings attached to the present specification, the scale, the aspect ratio, and the like are appropriately changed and exaggerated with respect to the scale, the aspect ratio, and the like of the object for convenience of illustration and understanding. The terms such as "parallel", "orthogonal", "identical", and the like, the values of the length and the values of the angle, which are used in the present specification to define the conditions of the shape and geometry and to define the degree of the conditions, are not limited to strict meanings, but are interpreted to include a range of degrees in which the same functions 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 device 1 including a state 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 control valve 2 includes a valve stem 2b, and the valve stem 2b includes 1 or more spool 2a (1 st movable portion). The flow 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, for example, an electromagnetic coil not shown. It is not necessarily required to move the valve stem 2b by electric control such as electromagnetic coil, but other control methods (e.g., hydraulic control) may be used to move the valve stem 2 b. One of the movement 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 control valve 2 and the hydraulic oil flowing out of the flow control valve 2 are blocked. Therefore, when it is desired to seal the flow of the hydraulic oil between the flow control valve 2 and the actuator 3, 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 valve stem 2b of the flow 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 control valve 2 of fig. 1 is provided with a plurality of ports through which the hydraulic oil flows in and out, and the inflow and outflow of the hydraulic oil to each port is controlled according to the position of the spool 2 a. For example, the flow control valve 2 has: a port P1 through which the hydraulic oil from the actuator 3 flows, a port P2 through which the hydraulic oil is supplied from the flow control valve 2 to the actuator 3, and a port P3 through which the hydraulic oil is discharged from the flow control valve 2 to the tank. The type and number of ports provided in the flow control valve 2 are arbitrary.
The actuator 3 has a movable portion (2 nd movable portion) 3b movable in, for example, a hollow sleeve 3 a. The actuator 3 changes the position of the movable portion 3b according to the discharge amount of the hydraulic oil from the flow 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 also include a position detecting unit 10 that detects the position of the movable unit 3b. The position detecting unit 10 is disposed, for example, on one end side of the movable unit 3b, and detects the distance to the movable unit 3b in a noncontact manner.
The state monitoring device 15 includes: the 1 st information acquisition unit 16, the 2 nd information acquisition unit 17, the state determination unit 18, and the state estimation unit 5. The state monitoring device 15 may also include a command detecting unit 19. The 1 st information acquiring unit 16, the 2 nd information acquiring unit 17, the state determining unit 18, and the state estimating unit 5 may be incorporated in the controller 6.
The 1 st information acquisition unit 16 acquires the position of the spool 2a in the flow control valve 2, and the flow control valve 2 controls the discharge amount of the working fluid based on the position of the spool (1 st movable unit) 2 a.
The 2 nd information acquisition unit 17 acquires the position of the movable unit 3b in the actuator 3, and the actuator 3 has a movable unit (2 nd movable unit) 3b that moves the position according to the working fluid ejected from the flow 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 of the movable unit 3b per unit time 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 where the supply of the working fluid to the actuator 3 is stopped. Thus, 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 to move the spool 2a to the neutral position. Thus, the state determination unit 18 may determine that the position of the spool 2a is the neutral position when the command detection unit 19 detects the command.
As described above, 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 in the neutral position, and therefore, it is possible to accurately determine the degree of wear of the spool 2a without disassembling the flow control valve 2 to take out the spool 2 a.
(embodiment 2)
Fig. 2 is a block diagram showing a schematic configuration of the fluid pressure drive device 1 according to embodiment 2. The fluid pressure driving device 1 of fig. 2 includes: a flow control valve 2, an actuator 3, a displacement detection unit 4, and a state estimation unit 5. The state estimating unit 5 forms a part of the controller 6, for example.
The flow control valve 2 and the actuator 3 in fig. 2 are similar to the flow control valve 2 and the actuator 3 in fig. 1, and detailed description thereof is omitted.
The displacement detection unit 4 detects the displacement of the movable portion 3b in the actuator 3. Here, the displacement is at least one of a displacement speed of the movable portion 3b and a time from receiving the movement command to starting the movement of the movable portion 3b. For example, in the case where the position detecting unit 10 that detects the position of the movable unit 3b is provided, the displacement detecting unit 4 performs differential processing on the position of the movable unit 3b detected by the position detecting unit 10, so that the displacement speed of the movable unit 3b can be detected. Alternatively, the displacement detecting unit 4 may include a speed sensor that directly detects the displacement speed of the movable unit 3b.
The state estimating unit 5 estimates the state of the spool (1 st movable portion) 2a based on the displacement of the movable portion 3b per unit time in a state in which the supply of the working fluid from the flow rate control valve 2 to the actuator 3 is stopped, the displacement of the movable portion 3b per unit time being calculated from 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 a displacement speed of the movable portion 3b and a time from receiving a command to make the movable portion 3b stationary at a predetermined position to starting movement. More specifically, the state estimating unit 5 estimates the state of the spool 2a of the flow 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 control valve 2 seals the hydraulic oil, so that the hydraulic oil should not flow into or out of the space between the flow control valve 2 and the actuator 3. However, if the spool 2a wears, as shown by the arrow in fig. 3 (a) or 3 (b), even if the spool 2a is located at the neutral position, the hydraulic oil leaks from the gap of the spool 2 a. As shown in fig. 3 (a) and 3 (b), it is assumed that the direction of the working oil leakage also varies depending on the place where the spool 2a wears. Depending on the direction in which the working oil leaks, a force to lift the movable portion 3b of the actuator 3 upward or a force to lower the movable portion 3b of the actuator 3 downward is applied. The displacement of the movable portion 3b may be detected after the spool 2a is moved to a position where 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 an orientation in which the movable portion 3b moves in the vertical direction, the movable portion 3b naturally 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 wears, even if the spool 2a is in the neutral position, the hydraulic oil leaks from the gap of the spool 2a to the actuator 3 side, and therefore the dropping speed of the movable portion 3b changes. For example, when the working oil leaks out toward the direction of fig. 3 (a), the falling speed of the movable portion 3b becomes faster. On the other hand, when the working oil leaks out in the direction of fig. 3 (b), the dropping speed of the movable portion 3b becomes slower.
In this way, when a command to move the spool 2a of the flow control valve 2 to the neutral position is received, the displacement of the movable portion 3b of the actuator 3 is detected, and it is possible to determine whether the spool 2a is worn. Therefore, for example, when the displacement speed of the movable portion 3b is different from the previously assumed displacement speed, the state estimating portion 5 estimates that the spool 2a is worn. Further, since the displacement speed of the movable portion 3b changes greatly as the degree of wear of the spool 2a increases, the degree of wear of the spool 2a can be estimated from the displacement speed of the movable portion 3b.
The fluid pressure driving device 1 of fig. 2 may be provided with a warning unit 11 indicated by a broken line. When the state estimating unit 5 determines that the displacement of the spool 2a exceeds the 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 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 warning content or an output sound may be displayed by a display device or a speaker connected to the flow control valve 2. An example of the warning content may be content that urges maintenance of the spool 2 a.
As described above, in embodiment 2, when a command to move the spool 2a of the flow 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 the spool 2a is worn, that is, whether leakage of hydraulic oil occurs when the spool 2a is located at the neutral position. In addition, the degree of wear of the spool 2a, that is, the leakage amount of the hydraulic oil can be estimated from the magnitude of displacement of the movable portion 3b.
(embodiment 3)
Embodiment 3 is an embodiment in which the life of the spool 2a of the flow control valve 2 is predicted based on the state estimated by the state estimating unit 5.
Fig. 4 is a diagram showing a schematic configuration of fluid pressure drive device 1 according to embodiment 3. The fluid pressure driving device 1 of fig. 4 includes a life predicting unit 12 in addition to the configuration of fig. 2.
The life predicting unit 12 predicts the life of the spool 2a of the flow control valve 2 based on the state of the spool 2a estimated by the state estimating unit 5 over a predetermined period. In general, since the spool 2a gradually wears during use, it is expected that the amount of hydraulic oil leaked when the spool 2a is located at the neutral position also gradually increases. However, if foreign matter contained in the hydraulic oil bites into the spool 2a, the leakage amount of the hydraulic oil may increase rapidly. The larger the leakage amount of the working oil is, the larger the displacement of the movable portion 3b of the actuator 3 is.
The displacement of the spool 2a is determined to reach the life of the spool 2a when the displacement reaches a large value, and this varies depending on the type, use, and the like of the flow control valve 2. Therefore, the life predicting unit 12 may set a threshold value for judging that the life of the spool 2a is reached. For example, the life predicting 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 point in time when the sign of the rapid increase in the leakage amount of the hydraulic oil is detected. More specifically, the following tendency may be present: the displacement speed of the spool 2a increases substantially linearly with the passage of time, but the slope of the increase in displacement speed becomes larger with a certain point in time, and in this case, it is determined that the life of the spool 2a is reached with this point in time.
In this way, it is conceivable that the various life predicting units 12 determine that the life of the spool 2a is the standard, but if it is determined that the life is reached, it is desirable to report that the spool 2a is replaced by some means. As in the warning processing by the warning unit 11 of fig. 2, various methods are conceivable as the method of reporting.
The life predicting unit 12 may report that the life of the spool 2a is approaching before the life is reached, and may provide information about when the life is reached.
As described above, in embodiment 3, since the life predicting unit 12 is provided to predict the life of the spool 2a based on the state estimated by the state estimating unit 5, it is possible to prevent a problem such as a large amount of hydraulic oil leaking during use of the flow control valve 2. In addition, since the replacement timing of the spool 2a can be grasped without disassembling the flow control valve 2 to inspect the spool 2a itself, maintenance and management costs of the flow control valve 2 can be reduced.
(embodiment 4)
Fig. 5 is a diagram showing a schematic configuration of the fluid pressure drive device 1 according to embodiment 4. The fluid pressure driving device 1 of fig. 5 is provided with a mode selecting unit 13 in the controller 6 in addition to the configuration of fig. 4. The fluid pressure driving device 1 according to embodiment 4 may further include 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 in which the state of the spool 2a is estimated. In addition to the state estimation mode, what operation mode is set depends on the structure and operation of the actuator 3. In the present embodiment, the operation of the fluid pressure driving device 1 when the controller 6 selects the state estimation mode 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 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 based on the detected displacement, the state estimation unit 5 estimates the state of the spool 2 a. 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 and the control in which the feedback of the position information of the movable unit 3b to the flow rate control valve 2 is stopped after the movable unit 3b is moved to the neutral position.
The operation mode of the flow control valve 2 can be selected by, for example, a button operation or a touch operation, which are not shown. Thus, 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 displacement of the movable portion 3b of the actuator 3 is detected, whereby the state of the spool 2a can be estimated.
In this way, in embodiment 4, since the operation mode for estimating the state of the spool 2a is provided, when 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 saves labor and time for the operator, and allows the wear state of the spool 2a to be checked at any time as needed. Thus, 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 driving device 1 including the flow control valve 2 and the actuator 3 has been described, but the configuration and operation of the actuator 3 are arbitrary, and therefore, the present invention can be widely applied to the fluid pressure driving device 1 that performs various operations using the hydraulic oil discharged from the flow control valve 2. The flow control valve 2 may have a spool 2a and may control the discharge amount of the hydraulic oil according to the position of the spool 2 a. In addition to the spool valve described above, specific examples of the flow control valve 2 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 that can be made to be position-variable according to the amount of hydraulic oil discharged from the flow rate control valve 2, and the actuator shaft is directly driven according to the position of the movable portion 3b, but the movable portion 3b may be a valve that controls the amount of hydraulic oil supplied to the actuator 3 separately provided according to the position. The specific example of the driving section may be a spool valve, a poppet valve, or a fluid pressure driving motor such as a hydraulic motor, in addition to the movable section 3b type actuator 3 described above.
The technical ideas of the above-described embodiments can be summarized as the following (1) to (11).
(1) A state monitoring device is provided with:
a 1 st information acquisition unit that acquires a 1 st movable portion position of a flow control valve that controls a discharge amount of a working fluid based on the 1 st movable portion position;
a 2 nd information acquisition unit that acquires a position of a 2 nd movable unit of an actuator having the 2 nd movable unit that moves in position according to the working fluid discharged from the flow control valve;
a state determination unit that determines 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 supply of the working fluid to the actuator is stopped; and
and a state estimating unit that estimates a state of the 1 st movable unit based on a displacement of the 2 nd movable unit per unit time when the state determining unit determines that the position of the 1 st movable unit is the neutral position.
(2) The condition monitoring apparatus according to (1), wherein,
the state monitoring device includes a detection unit that detects a state of the 1 st movable portion in 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 located at the neutral position, the state determination unit determines that the position of the 1 st movable unit is the neutral position.
(3) The condition monitoring apparatus according to (1), wherein,
the state monitoring device includes a detection unit that detects a command to move 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 is provided with:
a flow control valve for controlling the discharge amount 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 according to the working fluid ejected from the flow 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 portion based on a displacement of the 2 nd movable portion per unit time in a state in which the supply of the working fluid from the flow rate control valve to the actuator is stopped, the displacement of the 2 nd movable portion per unit time being calculated from the position of the 2 nd movable portion detected by the position detecting unit.
(5) The fluid pressure driving device according to (4), wherein,
the displacement is at least one of a displacement speed of the 2 nd movable portion and a time from receiving a command to stop the 2 nd movable portion at a predetermined position to starting movement.
(6) The fluid pressure driving device 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.
(7) The fluid pressure drive device according to any one of (4) to (6), wherein,
the fluid pressure driving device includes a life predicting unit that predicts the life of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimating unit over a predetermined period.
(8) The fluid pressure drive device according to any one of (4) to (7), wherein,
the actuator is arranged along the vertical direction,
the 2 nd movable portion is lowered by its own weight in a state in which the 2 nd movable portion is stopped from supplying the working fluid from the flow control valve to the actuator upon receiving a command to stop the 2 nd movable portion at a predetermined position.
(9) The fluid pressure drive device according to any one of (4) to (8), wherein,
when the state of the 1 st movable portion is estimated, the displacement of the 2 nd movable portion is detected after the 1 st movable portion is moved to a position where the supply of the working fluid from the flow control valve to the actuator is stopped.
(10) The fluid pressure drive device according to any one of (4) to (9), wherein,
the actuator is a valve that controls the supply amount of the working fluid relative to other actuators driven by the working fluid supplied from the actuator, according to the position of the 2 nd movable portion.
(11) The fluid pressure drive device according to any one of (4) to (10), wherein,
the fluid pressure driving device includes 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 and the control in which the feedback of the position information of the 2 nd movable unit to the flow control valve is stopped after the 2 nd movable unit is moved to the neutral position.
The form of the present invention is not limited to the above-described embodiments, but 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 matters. That is, various additions, modifications and partial deletions can be made without departing from the concept and spirit of the invention as defined in the claims and their equivalents.
Claims (8)
1. A fluid pressure driving device, wherein,
the fluid pressure driving device includes:
a flow control valve for controlling the discharge amount 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 according to the working fluid ejected from the flow control valve;
a controller that issues a command to move the 1 st movable portion to a neutral position;
a position detection unit that detects a position of the 2 nd movable unit when the command is received; and
and a state estimating unit that determines whether or not leakage of the working fluid occurs by comparing a displacement per unit time of the 2 nd movable unit with a displacement per unit time assumed in advance only when the 1 st movable unit is moved to the neutral position in accordance with the command, and estimates a state of at least one of wear and abrasion degree of the 1 st movable unit, wherein the displacement per unit time of the 2 nd movable unit is calculated from the position of the 2 nd movable unit detected by the position detecting unit.
2. The fluid pressure driving device according to claim 1, wherein,
the fluid pressure driving device includes 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 and the control in which the feedback of the position information of the 2 nd movable unit to the flow control valve is stopped after the 2 nd movable unit is moved to the neutral position.
3. The fluid pressure driving device according to claim 1, wherein,
the displacement per unit time of the 2 nd movable portion calculated from the position of the 2 nd movable portion detected by the position detecting portion is a displacement speed of the 2 nd movable portion.
4. The fluid pressure driving device according to claim 1, wherein,
the fluid pressure driving device includes a warning unit that gives a predetermined warning when the displacement exceeds a predetermined threshold.
5. The fluid pressure driving device according to claim 1, wherein,
the fluid pressure driving device includes a life predicting unit that predicts the life of the 1 st movable unit based on the state of the 1 st movable unit estimated by the state estimating unit over a predetermined period.
6. The fluid pressure driving device according to claim 1, wherein,
the actuator is arranged along the vertical direction,
the 2 nd movable portion is lowered by its own weight in a state in which the 2 nd movable portion is stopped from supplying the working fluid from the flow control valve to the actuator upon receiving a command to stop the 2 nd movable portion at a predetermined position.
7. The fluid pressure driving device according to claim 1, wherein,
when the state of the 1 st movable portion is estimated, the displacement of the 2 nd movable portion is detected after the 1 st movable portion is moved to a position where the supply of the working fluid from the flow control valve to the actuator is stopped.
8. The fluid pressure driving device according to claim 1, wherein,
the actuator is a valve that controls the supply amount of the working fluid relative to other actuators driven by the working fluid supplied from the actuator, according to the position of the 2 nd movable portion.
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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 true CN111379766B (en) | 2023-06-23 |
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| JP7254509B2 (en) | 2023-04-10 |
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| CN111379766A (en) | 2020-07-07 |
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