阅读说明：本技术 液压伺服阀的状态诊断方法、系统及其状态诊断装置 (Method and system for diagnosing state of hydraulic servo valve and state diagnosing device thereof ) 是由 荻野大树 于 2020-02-11 设计创作，主要内容包括：本发明的目的在于提供一种针对搭载到船舶的液压伺服阀可在船舶上精度良好地诊断液压伺服阀的状态的液压伺服阀的状态诊断方法。该液压伺服阀的状态诊断方法包括如下步骤：以可计量被搭载到船舶的液压伺服阀(10)的工作油(48)的泄漏量的方式安装流量计(32)的步骤；以使液压伺服阀(10)的阀柱(12)处于中立区域的状态供给工作油(48)的供给步骤；利用流量计(32)计量液压伺服阀(10)的工作油的泄漏量的计量步骤；以及基于流量计(32)的计量结果判定液压伺服阀(10)的状态的判定步骤。(The invention aims to provide a state diagnosis method of a hydraulic servo valve, which can accurately diagnose the state of the hydraulic servo valve on a ship. The state diagnosis method of the hydraulic servo valve comprises the following steps: a step of mounting a flow meter (32) so as to measure the amount of leakage of hydraulic oil (48) mounted on a hydraulic servo valve (10) of a ship; a supply step of supplying the hydraulic oil (48) in a state in which the spool (12) of the hydraulic servo valve (10) is in a neutral region; a measuring step of measuring the leakage amount of the hydraulic oil of the hydraulic servo valve (10) by using a flow meter (32); and a determination step for determining the state of the hydraulic servo valve (10) on the basis of the measurement result of the flow meter (32).)

1. A method of diagnosing the condition of a hydraulic servo valve comprising the steps of:

a mounting step of mounting a flowmeter so as to measure a leakage amount of hydraulic oil mounted on a hydraulic servo valve of a ship;

a supply step of supplying hydraulic oil in a state where a spool of the hydraulic servo valve is in a neutral region;

a measuring step of measuring a leakage amount of the hydraulic oil of the hydraulic servo valve by using the flow meter; and

and a determination step of determining a state of the hydraulic servo valve based on a measurement result of the flow meter.

2. The state diagnostic method of a hydraulic servo valve according to claim 1,

the hydraulic servo valve has a P port for receiving the supply of the working oil, an A port for outputting the working oil, and a T port for discharging the working oil,

the metering step includes the step of closing the a port.

3. The state diagnostic method of a hydraulic servo valve according to claim 2, wherein,

in the determining step, the metering results are classified into a plurality of partitions based on a threshold value.

4. The state diagnostic method of a hydraulic servo valve according to claim 3, wherein,

the threshold value is modified depending on the metering result at different points in time and the usage history of the hydraulic servo valve.

5. The state diagnostic method of a hydraulic servo valve according to claim 3 or 4, wherein,

and changing the threshold value according to the cleanliness of the working oil.

6. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 3 to 5, wherein,

and changing the threshold value according to the type, the route or the service time of the ship.

7. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 3 to 6, wherein,

changing the threshold value according to the temperature of the working oil.

8. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 1 to 7, wherein,

in the metering step, the position of the spool is changed in the neutral region to perform measurement.

9. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 1 to 8, wherein,

the mounting step includes the step of mounting the flow meter and the hydraulic servo valve to a stem.

10. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 1 to 9, wherein,

the method for diagnosing the state of the hydraulic servo valve further includes a step of outputting a measurement result of the flow meter to the outside of the ship.

11. The method for diagnosing the state of a hydraulic servo valve according to any one of claims 1 to 10, wherein,

the method for diagnosing the state of the hydraulic servo valve further includes a step of measuring the cleanliness of the hydraulic oil.

12. A hydraulic servo valve system is provided with a flow meter for measuring the leakage amount of working oil of the hydraulic servo valve.

13. A state diagnostic device for a hydraulic servo valve, comprising:

a flow meter that measures the amount of leakage of hydraulic oil that is mounted on a hydraulic servo valve of a ship; and

and a determination device that determines the state of the hydraulic servo valve based on the measurement result of the flow meter.

Technical Field

The present invention relates to a state diagnostic method for a hydraulic servo valve, a hydraulic servo valve system, and a state diagnostic device for a hydraulic servo valve.

Background

Patent document 1 describes the following technique: an engine control unit provided with a fuel supply device having a magnet actuator determines the operating state of the magnet actuator. In this technique, an actual measurement value of at least one magnetic characteristic of the magnet actuator is automatically measured, and whether or not the magnet actuator is operating accurately is determined based on the measurement result.

Disclosure of Invention

Problems to be solved by the invention

The present inventors have obtained the following knowledge about a hydraulic servo valve in which a spool is moved to change a communication state between a plurality of ports.

In such a hydraulic servo valve, the spool is controlled to move to a region in which the ports are communicated and a neutral region in which the ports are not communicated. If the hydraulic servo valve deteriorates, the ports are also slightly communicated with each other and the amount of leakage of the hydraulic oil increases when the spool is located in the neutral region. If the leakage amount increases, the operation of the connection device connected to the non-communicating port may be adversely affected, and therefore, the deteriorated hydraulic servo valve may require maintenance work such as replacement or repair.

It is desirable that a hydraulic servo valve used in a ship such as a ship engine be maintained in advance while observing the necessity of maintenance before sailing, in order to avoid a problem in sailing. Therefore, a method of detaching the valve and transferring the valve to an outboard factory for inspection is conceivable, and this method is not efficient because it takes much labor and time. Therefore, development of a technique for enabling a ship to accurately determine whether or not a hydraulic servo valve needs maintenance is desired. However, in the technique described in patent document 1, the magnet actuator is indirectly evaluated using the measurement value of the magnetic characteristic, but the amount of leakage of the hydraulic oil cannot be grasped, and the diagnosis accuracy cannot be said to be high.

Thus, the present inventors recognized that: from the viewpoint of accurately diagnosing the hydraulic servo valve, the technique described in patent document 1 has room for improvement.

Such a problem may occur not only in the hydraulic servo valve used in the engine but also in a hydraulic servo valve used in other types of equipment mounted on the ship.

The present invention has been made in view of the above problems, and an object thereof is to provide a state diagnosis method for a hydraulic servo valve, which can accurately diagnose the state of the hydraulic servo valve on a ship.

Means for solving the problems

In order to solve the above problem, a condition diagnosing method according to an aspect of the present invention includes: a mounting step of mounting a flowmeter so as to measure a leakage amount of hydraulic oil mounted on a hydraulic servo valve of a ship; a supply step of supplying hydraulic oil in a state where a spool of the hydraulic servo valve is in a neutral region; a measuring step of measuring a leakage amount of the hydraulic oil of the hydraulic servo valve by using a flow meter; and a determination step of determining a state of the hydraulic servo valve based on a measurement result of the flow meter.

According to this aspect, the state of the hydraulic servo valve can be diagnosed based on the amount of leakage of the hydraulic oil.

In addition, any combination of the above, and the form in which the constituent elements and expressions of the present invention are replaced with each other between a method, an apparatus, a program, a temporary or non-temporary storage medium, a system, or the like in which the program is recorded are also effective as the form of the present invention.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a state diagnosis method for a hydraulic servo valve, which can accurately diagnose the state of the hydraulic servo valve on a ship.

Drawings

Fig. 1 is a schematic diagram showing the periphery of a hydraulic servo valve to which the diagnostic method according to embodiment 1 is applied.

Fig. 2 is a schematic diagram schematically showing the position of a valve body and the open/close state of a port of the hydraulic servo valve of fig. 1.

Fig. 3 is a diagram showing a state in which a leakage amount measuring device is attached to the hydraulic servo valve of fig. 1.

Fig. 4 is a flowchart showing an example of the process of the diagnostic method according to embodiment 1.

Fig. 5 is a block diagram schematically showing an example of a hydraulic servo valve diagnostic system to which the diagnostic method according to embodiment 1 is applied.

Fig. 6 is a flowchart showing an example of the mounting procedure of the diagnostic method of fig. 4.

Fig. 7 is a flowchart showing an example of the metering step of the diagnostic method of fig. 4.

Fig. 8 is a flowchart showing an example of the determination procedure of the diagnostic method of fig. 4.

Fig. 9 is a flowchart showing an example of a cleanliness measurement step of the diagnostic method of fig. 4.

Fig. 10 is a diagram showing a state in which the cleanliness inspection device is attached in the cleanliness measuring step of fig. 9.

Description of the reference numerals

10. A hydraulic servo valve; 12. a spool; 14. a valve body; 16. a port; 16a, port A; 16P, P port; 16T, T port; 18. a spool driving section; 20. a main valve; 30. a leakage amount metering device; 32. a flow meter; 34. a tube holder; 36. a cleanliness inspection device; 38. a foreign matter inspection device; 40. a tube holder; 42. a hydraulic pump; 44. an oil storage tank; 48. working oil; 50. a determination device; s100, diagnosis method.

Detailed Description

The present invention will be described below based on preferred embodiments with reference to the drawings. In the embodiment and the modifications, the same or equivalent constituent elements and members are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. In addition, the dimensions of the members in the drawings are shown enlarged and reduced as appropriate for easy understanding. In the drawings, parts of members that are not essential to the description of the embodiments are omitted.

The term including the ordinal numbers 1, 2, and the like is used for the purpose of describing various components, and the term is used only for the purpose of distinguishing one component from another component, and the components are not limited by the term.

[ embodiment 1 ]

A state diagnostic method S100 for a hydraulic servo valve according to embodiment 1 of the present invention will be described with reference to the drawings. The diagnostic method S100 can be applied to various hydraulic servo valves, and here, an example of applying the diagnostic method S100 to the hydraulic servo valve 10 used in the marine engine 80 will be described.

First, the peripheral structure of the hydraulic servo valve 10 will be described. Fig. 1 is a schematic diagram showing the periphery of a hydraulic servo valve 10 to which the diagnostic method S100 is applied. The hydraulic servo valve 10 is connected to a controlled device such as an actuator, and controls the operation of the controlled device by changing the delivery state of the hydraulic oil 48 to the controlled device based on a command from a higher-level control device (not shown). In the description, a hydraulic servo valve having 3 connection ports is exemplified as the hydraulic servo valve 10, and a main valve 20 that controls the fuel supply amount to the ship engine 80 is exemplified as the controlled device. As shown in fig. 1, the hydraulic servo valve 10 is connected to a main valve 20 and functions as a pilot valve for controlling the operation of the main valve 20. The main valve 20 and the hydraulic servo valve 10 are provided to a plurality of (for example, 6) cylinders of the engine 80, respectively.

The hydraulic servo valve 10 is connected to the main valve 20 by a plurality of bolts B1. A plurality of through holes 10h for passing bolts B1 are bored in the hydraulic servo valve 10. The main valve 20 is provided with a plurality of female screws 20h for screwing the bolts B1. The through holes 10h are disposed at positions corresponding to the positions of the female screws 20 h. The hydraulic servo valve 10 is coupled to the main valve 20 by inserting the bolt B1 through the through hole 10h and screwing the internal thread 20 h. By removing the bolt B1, the hydraulic servo valve 10 is separated from the main valve 20.

The hydraulic system of the main valve 20 of fig. 1 includes an oil tank 44 that stores hydraulic oil 48, and a hydraulic pump 42 that pressurizes and delivers the hydraulic oil 48 in the oil tank 44. The hydraulic oil 48 sent from the hydraulic pump 42 is supplied to the interior of the main valve 20 and the hydraulic servo valve 10 via the pump-side piping portion 22p in the main valve 20. The hydraulic oil 48 discharged from the hydraulic servo valve 10 and the main valve 20 returns to the oil tank 44 through the tank-side pipe portion 22t in the main valve 20. The pump-side piping portion 22p and the tank-side piping portion 22t are collectively referred to as a main valve piping portion.

The hydraulic servo valve 10 mainly includes a main body portion 10b, a spool 12, a port 16, and a spool drive portion 18. The spool 12 has a shaft 12s and a plurality of valve bodies 14 that move integrally with the shaft 12 s. The spool 12 is driven by the spool driving unit 18 to advance and retreat in the 1 st direction. Hereinafter, for convenience, the direction in which the spool 12 extends from the spool drive portion 18 in the 1 st direction (downward in fig. 1) is referred to as "extending direction" and "extending side", and the direction opposite to the extending direction is referred to as "reverse extending direction" and "reverse extending side".

An urging member 12h that urges the spool 12 in the reverse extending direction is provided on the extending side of the spool 12. The urging member 12h may be, for example, a coil spring that expands and contracts in the 1 st direction. The spool driving unit 18 includes an electromagnetic actuator (not shown) that advances and retracts the shaft 12s in the 1 st direction. The spool driving unit 18 advances and retracts the shaft 12s based on a command from a control device (not shown), and controls the position of the valve element 14 by utilizing the balance between the biasing force of the biasing member 12h and the spool.

The valve body 14 includes a 1 st valve body 14a, a 2 nd valve body 14b, and a 3 rd valve body 14c, which are arranged to be spaced apart in the 1 st direction. The 2 nd valve element 14b is disposed on the opposite extension side of the 1 st valve element 14a, and the 3 rd valve element 14c is disposed on the extension side of the 1 st valve element 14 a. The 1 st valve body 14a changes the communication state of the a port 16a, which will be discussed later, according to the position of the 1 st direction thereof. The body portion 10b has a cylindrical space 10s extending in the 1 st direction and accommodating the spool 12. The cylindrical space 10s functions as a cylinder surrounding the valve element 14 with a narrow gap therebetween.

The body portion 10b is provided with a port 16. The ports 16 of the present embodiment include a P port 16P, an a port 16a, and a T port 16T. The P port 16P is connected to the pump-side pipe portion 22P, and pressurized hydraulic oil 48 is supplied from the hydraulic pump 42. The a port 16a is connected to the hydraulic oil receiving portion 22a of the main valve 20. The main valve 20 changes the fuel supply amount to the engine 80 based on the pressure of the hydraulic oil 48 supplied to the hydraulic oil receiving portion 22 a. The T-port 16T is connected to the tank-side pipe portion 22T, and discharges the hydraulic oil 48 flowing through the main body portion 10b to the oil reservoir 44 through the tank-side pipe portion 22T.

Fig. 2 is a schematic diagram schematically showing the position of the valve body 14 of the hydraulic servo valve 10 in the 1 st direction and the open/close state of the ports. In fig. 2, elements that are not important for explanation are not described. Fig. 2 (a) shows a state in which the valve body 14 is located in the 1 st region in which the a port 16a and the P port 16P communicate with each other. In this state, the a port 16a supplies the hydraulic oil 48 from the P port 16P to the hydraulic oil receiving portion 22a (hereinafter, referred to as "supply mode"). In the supply mode, the hydraulic oil 48 from the P port 16P is supplied to the hydraulic oil receiving portion 22a of the main valve 20. By this operation, for example, the main valve 20 is operated to increase the fuel supply amount to the engine 80.

Fig. 2 (b) shows a state in which the valve body 14 is located in a neutral region where the a port 16a is blocked and the P port 16P and the T port 16T are not communicated. In this state, the a port 16a is blocked and neither supplied nor recovered to the hydraulic oil receiving unit 22a (hereinafter, referred to as "neutral mode"). In the neutral mode, the hydraulic pressure of the hydraulic oil receiving portion 22a of the main valve 20 is maintained in a state immediately before the valve element 14 is located in the neutral region. Due to this operation, for example, the main valve 20 operates so as to maintain the fuel supply amount to the engine 80 in a state immediately before.

Fig. 2 (c) shows a state in which the valve body 14 is located in the 2 nd region where the a port 16a and the T port 16T communicate with each other. In this state, the a port 16a recovers the hydraulic oil 48 from the hydraulic oil receiving portion 22a and returns to the pump-side pipe portion 22p (hereinafter, referred to as "recovery mode"). In the recovery mode, the hydraulic oil 48 in the hydraulic oil receiving portion 22a of the main valve 20 is recovered to the oil reservoir 44 via the a port 16a, the T port 16T, and the tank-side pipe portion 22T. Due to this operation, for example, the main valve 20 is operated to reduce the fuel supply amount to the engine 80.

In this way, by controlling the position of the valve element 14 by the spool driving portion 18, the hydraulic servo valve 10 and the main valve 20 can adjust the fuel supply amount to the engine 80. However, if these valves are used for a long time, the valve body 14 is worn. When the valve body 14 is worn, the degree of articulation (japanese: temperate) as a valve is reduced, and the a port 16a, the P port 16P, and the T port 16T are also slightly communicated with each other in the neutral mode.

In the neutral mode, when the hydraulic oil 48 leaks from the P port 16P to the a port 16a, the hydraulic pressure of the hydraulic oil receiving portion 22a gradually increases to increase the fuel supply amount to the engine 80, which causes deterioration in the fuel economy of the engine 80.

In the neutral mode, when the hydraulic oil 48 leaks from the a port 16a to the T port 16T, the hydraulic pressure of the hydraulic oil receiving portion 22a gradually decreases to reduce the fuel supply amount to the engine 80, and the output of the engine 80 decreases.

As the service life of the hydraulic servo valve 10 increases, the wear of the valve body 14 progresses and the amount of leakage of the hydraulic oil 48 of the hydraulic servo valve 10 (hereinafter, simply referred to as "leakage amount") increases. If the leakage amount exceeds the allowable amount, the hydraulic servo valve 10 and the main valve 20 cannot function normally, resulting in a failure. That is, if the leakage amount can be grasped with high accuracy, the hydraulic servo valve 10 can be replaced or repaired before the leakage amount exceeds the allowable amount to avoid unexpected failure.

Next, the diagnostic method S100 according to the present embodiment will be described with reference to fig. 3 to 5. Fig. 3 is a diagram showing a state in which the leakage amount measuring device 30 is mounted on the hydraulic servo valve 10. Fig. 4 is a flowchart showing an example of the hydraulic servo valve state diagnosis method S100. The diagnostic method S100 mainly includes a mounting step S110, a measuring step S120, and a determining step S130. Fig. 5 is a block diagram showing an example of the diagnostic system 1 of the hydraulic servo valve 10 to which the diagnostic method S100 is applied.

Each functional block shown in fig. 5 can be realized by an electronic component such as a CPU of a computer or a mechanical component in hardware, or by a computer program in software, and here, functional blocks realized by cooperation of these are depicted. Thus, those skilled in the art can understand that these functional modules can be implemented in various ways by a combination of hardware and software.

(leakage measuring device)

In the diagnostic method S100, the leakage amount is measured in a state where the leakage amount measuring device 30 is attached to the hydraulic servo valve 10 and the main valve 20. Therefore, the leakage amount measuring device 30 is explained first. As shown in fig. 3, the leakage amount measuring device 30 includes a flowmeter 32, a stem 34, and a determination device 50. The flow meter 32 meters the amount of the working oil 48 leaking from the hydraulic servo valve 10. The pipe seat 34 is a jig for connecting the flow meter 32 to the port 16 of the hydraulic servo valve 10. The determination device 50 determines whether maintenance is necessary based on the measurement value of the flow meter 32.

The flow meter 32 may be a flow meter capable of measuring a leakage amount, and may be a non-contact type using ultrasonic waves, electromagnetic waves, or the like, or a contact type using an impeller or the like. The flow meter 32 of the present embodiment measures the amount of leakage by the flow rate of the hydraulic oil 48 using ultrasonic waves. In this case, since the flow of the hydraulic oil 48 is not affected, the cause of the metering error can be reduced.

As shown in fig. 3, the stem 34 includes a thick plate-shaped main body 34b, and a 1 st stem pipe 34p, a 2 nd stem pipe 34m, and a 3 rd stem pipe 34n that are inserted into the main body 34 b. The 1 st, 2 nd and 3 rd pipe-holder pipes 34p, 34m, 34n are collectively referred to as a pipe-holder pipe. The socket 34 is provided with a plurality of (e.g., 4) through holes 34h for passing bolts therethrough in the thickness direction. The through holes 34h are disposed at positions corresponding to the positions of the through holes 10 h. The 1 st pipe seat pipe 34P extends in the thickness direction of the body portion 34b and connects the P port 16P of the hydraulic servo valve 10 and the pump-side pipe portion 22P of the main valve 20. The 1 st pipe support pipe 34P guides the hydraulic oil 48 from the hydraulic pump 42 to the P port 16P.

One end side of the 2 nd pipe seat pipe 34m is connected to the T port 16T of the hydraulic servo valve 10, and the other end side is connected to the inlet portion 32e of the flow meter 32. One end side of the 3 rd pipe support pipe 34n is connected to the tank-side pipe portion 22t of the main valve 20, and the other end side is connected to the outlet portion 32f of the flow meter 32. That is, the 2 nd stem pipe 34m leads the hydraulic oil 48 leaking from the T port 16T of the hydraulic servo valve 10 to the flow meter 32, and the 3 rd stem pipe 34n leads the hydraulic oil 48 having passed through the flow meter 32 to the tank-side pipe portion 22T. With this configuration, the flow meter 32 can measure the amount of leakage of the hydraulic oil 48 from the T-port 16T.

The seat 34 has a shape that closes the a port 16a of the hydraulic servo valve 10 and the hydraulic oil receiving portion 22a of the main valve 20. That is, in a state where the tube seat 34 is attached, the a port 16a and the working oil receiving portion 22a are closed by the tube seat 34.

(installation step)

The mounting step S110 is explained with reference to fig. 3, 4, and 6. Fig. 6 is a flowchart showing an example of the mounting step S110. In this step, in order to install the leakage amount measuring device 30 to the hydraulic servo valve 10 and the main valve 20, the following process is performed on the ship.

(1) Before the leakage amount measuring device 30 is attached, the bolt B1 is removed to separate the hydraulic servo valve 10 from the main valve 20 (step S112).

(2) Next, the stem 34 is connected to the hydraulic servo valve 10 and the main valve 20 with the stem 34 interposed between the hydraulic servo valve 10 and the main valve 20 (step S114). Specifically, the plurality of bolts B2 are inserted through the through holes 34h and 10h and screwed into the female threads 20h in a state where the stem pipe is aligned with the main valve pipe portion and the port 16. Bolt B2 may also be longer than bolt B1 by an amount corresponding to the thickness of socket 34.

(measurement step)

The measurement step S120 is explained with reference to fig. 3, 4, and 7. Fig. 7 is a flowchart showing an example of the measuring step S120. The step S120 includes a step of closing the a port 16a, a step of supplying the hydraulic servo valve 10 with the hydraulic oil 48, and a step of measuring the amount of leakage of the hydraulic oil 48 by the flow meter 32. In step S120, the following process is performed for the hydraulic servo valve 10 to which the leakage amount measuring device 30 is attached.

(1) The spool drive section 18 is controlled such that the valve body 14 is located in the neutral region. For example, a command to move the valve element 14 to the neutral region is output from the host control device to the spool driving unit 18 (step S122).

(2) The hydraulic oil 48 is supplied from the hydraulic pump 42 to the P port 16P via the pump-side pipe portion 22P (step S124). In this step, the working oil 48 is supplied for a predetermined period (for example, 30 minutes, 1 hour, or the like). In this case, the hydraulic oil 48 may be supplied from a hydraulic pump for testing provided independently of the hydraulic pump 42, and in the present embodiment, the hydraulic oil 48 may be supplied from the hydraulic pump 42 used during normal operation of the ship. In this case, since the measurement can be performed under normal use conditions, the measurement error due to the difference in conditions can be reduced.

(3) While the hydraulic oil 48 is supplied to the P port 16P in step S124, the amount of leakage from the T port 16T is measured by the flow meter 32 (step S126). The leak amount measurement period may be extended or shortened in consideration of time lag or the like.

(4) While the leakage amount is being measured in step S126, the flowmeter 32 outputs the measurement result to the determination device 50 (step S128).

(determination step)

The determination step S130 is described with reference to fig. 3, 4, and 8. Fig. 8 is a flowchart showing an example of the determination step S130. In this step, the determination device 50 determines whether or not the hydraulic servo valve 10 needs maintenance based on the measurement result of the measurement step S120.

(determination device)

The determination device 50 will be described with reference to fig. 3 and 5. The determination device 50 may be provided separately from the leakage amount measuring device 30, and in this example, may be provided integrally with the leakage amount measuring device 30. The determination device 50 of the present embodiment includes an operation result acquisition unit 50b, a measurement value acquisition unit 50c, a storage unit 50m, a determination unit 50e, a display control unit 50d, and an output unit 50 h.

The operation result acquisition unit 50b acquires the operation result of the operation unit 30 s. The operation unit 30s is provided in the leakage amount measuring device 30, for example, and receives operations of an operator, such as activation and deactivation of the determination device 50, display of a determination result, output of a measurement result and a determination result, and the like. The operation unit 30s may be a touch panel.

The measurement value acquiring unit 50c acquires the measurement value of the flow meter 32. The determination unit 50e determines whether or not the hydraulic servo valve 10 requires maintenance based on the acquisition result of the measurement value acquisition unit 50 c. The display control unit 50d causes the display device 52 to display the determination result of the determination device 50. The display device 52 may be, for example, a liquid crystal display device provided integrally with the operation portion 30 s.

The storage unit 50m stores a threshold value (to be discussed later), an acquisition result of the measurement value acquisition unit 50c, a determination result of the determination device 50, and other predetermined information.

The output unit 50h outputs the measurement result of the flow meter 32 and the determination result of the determination device 50 to the outside. For example, the output unit 50h may transmit the measurement result of the flow meter 32 and the determination result of the determination device 50 to a web server via the internet or the like, or may transmit these results to the information terminal 54 carried by the operator.

The determination step S130 is started by the operator performing an operation to start the determination process from the operation unit 30S. When the determination step S130 is started, the determination device 50 acquires the measurement value of the flow meter 32 (hereinafter referred to as "measurement value V") (step S132). In this step, the measurement value obtaining unit 50c obtains the measurement value V for a predetermined period (for example, 30 minutes, 1 hour) and stores the measurement value V in the storage unit 50 m.

Upon acquiring the measurement value V of the flowmeter 32, the determination device 50 calculates the amount of leakage per unit time (hereinafter referred to as "leakage amount Q") based on the measurement value V (step S134). In this step, the determination unit 50e divides the cumulative value of the measured value V by the measurement time to calculate the leakage amount Q, and stores the leakage amount Q in the storage unit 50 m. In the present embodiment, the measurement result of the flowmeter is exemplified by the leakage amount Q.

Once the leakage amount Q is calculated, the determination device 50 classifies the leakage amount Q into a plurality of divisions based on the threshold T (step S136). By performing the division with the threshold T, a stable determination result is obtained. The threshold T may be 1 threshold, or may include a plurality of thresholds. By using a plurality of threshold values, a more appropriate determination result is obtained. In the present embodiment, the threshold T includes the 1 st threshold T1 and the 2 nd threshold T2, and the determination device 50 determines the leakage amount Q by classifying it into 3 divisions. For example, the 1 st threshold T1 may be set to a level that does not require maintenance when the leakage amount Q is equal to or less than the 1 st threshold T1. The 2 nd threshold value T2 is set to a level that requires quick maintenance when the leakage amount Q exceeds the 2 nd threshold value T2.

The determination device 50 determines the necessity of maintenance based on the classification result of the leakage amount Q (step S138). For example, if the leakage amount Q is equal to or less than the 1 st threshold T1, it may be determined that maintenance is not required, if the leakage amount Q exceeds the 1 st threshold T1 and is equal to or less than the 2 nd threshold T2, it may be determined that maintenance is required within a predetermined period, and if the leakage amount Q exceeds the 2 nd threshold T2, it may be determined that maintenance is required as soon as possible. The determination device 50 stores the determination result (hereinafter referred to as "determination result R") in the storage unit 50 m.

Upon determining the necessity of maintenance, the determination device 50 outputs the determination result R (step S140). In this step, the display control unit 50d may display the determination result R on the display device 52, and the output unit 50h may output information such as the leak amount Q and the determination result R to the outside of the ship. For example, the information may be transmitted to an information terminal of an inspector located outside the ship.

Upon outputting the determination result R, the determination device 50 ends the determination step S130. Next, the leakage amount measuring device 30 is removed and the hydraulic servo valve 10 is attached to the main valve 20, and the process of the diagnostic method S100 is ended. These steps of the diagnostic method S100 are basically an example, and other steps may be added, or a part of the steps may be changed or deleted, or the order of the steps may be changed.

(threshold value)

The threshold value T will be explained. The threshold value T may be fixed to a predetermined value, but the state of wear differs depending on various factors, and thus the threshold value T may be changed depending on these factors. The relationship between the threshold T and several factors will be described below.

In the case where the rate of progress of wear is fast, the threshold T is reduced, and in the case where the rate is slow, the threshold T is increased. The rate of progress of wear can be calculated by dividing the difference in leak amount Q calculated from the measurement results at different points in time (for example, initially and after 1 year) in the past by the time difference (period) at different points in time. Further, the threshold value T may be decreased when the frequency of use of the hydraulic servo valve 10 is high, and may be increased when the frequency is low. In the present embodiment, the threshold value T is changed according to the measurement results at different time points in the past and the usage history of the hydraulic servo valve 10.

The progress of wear is related to the presence of cleanliness (foreign matter content) of the working oil 48. The inventors of the present invention conducted studies and found, as a result, that: the more foreign matter (sometimes referred to as contamination) such as metal powder contained in the hydraulic oil 48, the more the abrasion of the valve element 14 is promoted. Thus, the threshold T may be reduced when the cleanliness of the hydraulic oil 48 is low (i.e., the foreign matter content is large), and increased when the cleanliness is high (i.e., the foreign matter content is small). In the present embodiment, the threshold T is changed in accordance with the cleanliness of the hydraulic oil 48. Further, the process of gauging the cleanliness of the working oil 48 is discussed subsequently.

The progress of wear varies depending on the frequency of acceleration and deceleration of the ship. In addition, the progress of wear differs depending on the temperature, humidity, or weather of the course of the ship. In addition, the progress of wear differs depending on the use time of the ship. Thus, in the present embodiment, the threshold T is changed according to the type, route, or use time of the ship. As an example, the threshold T is reduced when the type, route, or use time of the ship promotes the progress of the wear, and is increased when the progress of the wear is difficult to promote.

The viscosity of the working oil 48 varies depending on the temperature of the working oil 48. For example, when the viscosity is low at a high temperature, the lubricity of the working oil 48 may be reduced, and when the fluidity is low at a low temperature, the lubricity may be reduced. Thus, the progress of wear differs depending on the temperature of the working oil 48. Thus, in the present embodiment, the threshold T is changed in accordance with the temperature of the hydraulic oil 48. As an example, the threshold T is reduced when the temperature of the hydraulic oil 48 is within a range in which the progress of wear is promoted, and is increased when the progress of wear is difficult to promote.

(cleanliness measuring technique)

A process for measuring the cleanliness of the working oil 48 will be described with reference to fig. 9 and 10. The process includes a cleanliness metering step S150 of metering the cleanliness of the working oil 48. The cleanliness measuring step S150 may also be performed separately from the process of the diagnostic method S100. The following examples are shown in the description: after the above-described determination step S130 is completed, step S150 is executed in a series of steps of the diagnostic method S100.

Fig. 9 is a flowchart showing the cleanliness measuring step S150. Fig. 10 is a diagram showing a state in which the cleanliness check device 36 is attached to the main valve 20 in the cleanliness measuring step S150. In this step, the cleanliness of the working oil is checked in this state. Thus, the cleanliness inspection device 36 is explained first.

(cleanliness testing device)

As shown in fig. 10, the cleanliness inspection device 36 includes a foreign matter inspection device 38 and a stem 40. The foreign matter inspection device 38 may inspect the cleanliness of the hydraulic oil 48, and in the present embodiment, is a device that optically counts the number of foreign matters to inspect the cleanliness. The stem 40 is used to connect the foreign matter inspection device 38 between the pump-side pipe portion 22p and the tank-side pipe portion 22t of the main valve 20.

The stem 40 has: a main body 40b having the same outer shape as the stem 34; the 1 st pipe support pipe 40p and the 2 nd pipe support pipe 40m are inserted into the body 40 b. A plurality of through holes 40h for passing the bolts B2 are bored in the tube holder 40. The through holes 40h are disposed at positions corresponding to the positions of the female screws 20 h. The stem 40 is coupled to the main valve 20 by screwing the bolt B2 into the female screw 20h through the through hole 40h, and is separated from the main valve 20 by removing the bolt B2.

Further, when the hydraulic oil inspection is performed, the hydraulic servo valve 10 may be removed and temporarily mounted, but if temporarily mounted, there is a problem in that the processing of the hydraulic servo valve 10 takes extra labor. Therefore, in the example of fig. 10, the hydraulic servo valve 10 is also connected together with the stem 40. Further, it is not necessary to connect the hydraulic servo valve 10, and only the stem 40 may be connected by using a short bolt.

The 1 st pipe seat pipe 40p connects the pump-side pipe portion 22p of the main valve 20 and the inlet portion 38e of the foreign matter inspection device 38, and introduces the hydraulic oil 48 from the hydraulic pump 42 into the foreign matter inspection device 38. The 2 nd stem pipe 40m connects the tank-side pipe portion 22t of the main valve 20 and the outlet portion 38f of the foreign matter inspection device 38, and discharges the hydraulic oil 48 from the foreign matter inspection device 38 to the oil storage tank 44.

In the cleanliness measuring step S150, first, the leakage amount measuring device 30 is detached from the main valve 20 (step S152). In this step, the bolts B2 are removed to separate the hydraulic servo valve 10 and the leakage amount measuring device 30 from the main valve 20.

Next, as shown in fig. 10, the cleanliness inspection device 36 is attached to the main valve 20 (step S154). Specifically, in a state where the 1 st socket pipe 40p and the 2 nd socket pipe 40m are aligned with the pump-side pipe 22p and the tank-side pipe 22t, the plurality of bolts B2 are screwed into the female screw 20h through the through hole 40 h.

Next, the hydraulic oil 48 is supplied from the hydraulic pump 42 to the foreign matter inspection device 38 (step S156). Specifically, the hydraulic pump 42 is operated to introduce the hydraulic oil 48 into the inlet portion 38e of the foreign matter inspection device 38 via the pump-side pipe portion 22p, and to discharge the hydraulic oil 48 from the outlet portion 38f of the foreign matter inspection device 38 to the oil reservoir 44 via the tank-side pipe portion 22 t. In this case, since the inspection can be performed under normal use conditions, inspection errors due to different conditions can be reduced.

Next, while the working oil 48 is being supplied to the foreign matter inspection device 38 in step S156, the cleanliness of the working oil 48 is inspected by the foreign matter inspection device 38 (step S158). In this step, the foreign matter inspection device 38 inspects the count value and the size of the foreign matter at predetermined time intervals, and displays the inspection result (hereinafter referred to as an inspection result U).

When the inspection result U of the foreign matter inspection device 38 is obtained, the inspection result U is classified with reference to a predetermined reference value, and the threshold value T is adjusted according to the classification result (step S160). In this step, the 1 st threshold T1 and the 2 nd threshold T2 may be adjusted according to the classification result of the inspection result U, and the maintenance necessity determination result R may be corrected. Step S160 may be manually executed by the operator, or may be autonomously executed by the determination device 50 by automatically outputting the inspection result U to the determination device 50.

Next, the foreign matter inspection device 38 is removed, and the hydraulic servo valve 10 is attached to the main valve 20, and the process of the cleanliness measuring step S150 is completed.

Next, the measurement step S120 will be described in further detail. In the metering step S120 of the present embodiment, the position of the spool 12 is changed to a plurality of positions in the neutral region, and measurement is performed. In this case, the wear position of the spool 12 can be estimated from the difference in the leakage amount at each of the plurality of portions.

For example, the leakage amount Q may be measured at each position by moving the spool 12 to the 1 st position, the center position, and the 2 nd position of the extended-side end portion in the neutral region. When the leakage amount Q at the 1 st position is larger than the leakage amount Q at the 2 nd position, it can be determined that the degree of wear on the extension side of the valve body 14 is larger than the degree of wear on the counter extension side, and when the amount Q is smaller, it can be determined that the degree of wear on the counter extension side is larger than the degree of wear on the extension side.

Further, the leakage amount Q may be measured at each point by multipoint-moving the spool 12 from the 1 st position to the 2 nd position. In this case, by plotting the leakage amount Q at each point, the worn portion of the spool 12 can be grasped with higher accuracy. In addition, the minimum position where the leakage amount Q in the neutral region becomes minimum can be specified.

Further, the spool 12 may be gradually moved from the 1 st position to the 2 nd position, and the leakage amount Q during the movement may be measured. In this case, by plotting the leakage amount Q corresponding to the position of the spool 12, the minimum position of the leakage amount in the neutral region can be determined with high accuracy. By controlling the position of the spool 12 to the determined minimum position, the amount of leakage of the hydraulic servo valve 10 can be reduced as compared with the case of controlling to the initial center position.

The operation and effect of the present embodiment described above will be described. The method S100 for diagnosing the state of the hydraulic servo valve according to the present embodiment includes the steps of: a step S110 of mounting the flow meter 32 so as to measure the leakage amount of the hydraulic oil mounted on the hydraulic servo valve 10 of the ship; a step of supplying the hydraulic oil 48 in a state where the spool 12 of the hydraulic servo valve 10 is in a neutral region; a measuring step S120 of measuring the leakage amount of the hydraulic oil of the hydraulic servo valve 10 by using the flow meter 32; and a determination step S130 of determining the state of the hydraulic servo valve based on the measurement result of the flow meter 32.

According to this aspect, since the hydraulic servo valve in a state of being mounted on the ship is diagnosed on the ship, the number of working steps can be reduced and the inspection period can be shortened as compared with a case where the valve is transferred to the outside of the ship and inspected. Further, since the amount of leakage of the hydraulic oil is directly measured for the valve in the state mounted on the ship, the cause of error can be reduced and the wear state can be accurately grasped as compared with the case of indirect estimation. Further, since whether or not the hydraulic servo valve needs maintenance is quantitatively determined based on the measurement result, the determination accuracy can be improved as compared with the case of qualitatively determining.

The hydraulic servo valve has a P port for receiving the supply of the hydraulic oil, an a port for outputting the hydraulic oil, and a T port for discharging the hydraulic oil, and the metering step S120 may include a step of closing the a port 16 a. In this case, the hydraulic oil 48 can be prevented from flowing out from the a port 16a to the main valve 20 and the main valve 20 can be prevented from malfunctioning. Since the leakage from the a port 16a can be blocked, the measurement error of the leakage amount Q to the T port 16T can be reduced.

In the determination step S130, the measurement results (leakage amount Q) may be classified into a plurality of sections based on the threshold value T. In this case, by dividing based on the threshold T, a stable determination result is obtained. By classifying into a plurality of partitions, a more flexible and accurate determination result can be obtained.

The threshold value T may also be changed depending on the metering result (leakage amount Q) at different points in time and the use history of the hydraulic servo valve 10. In this case, when the wear rate changes due to a change rate of the leakage amount Q or a difference in usage history, and the determination accuracy is lowered, the threshold value T is corrected based on the change rate of the leakage amount Q, so that the determination accuracy can be improved, and erroneous determination can be suppressed.

The threshold value T may be changed according to the cleanliness of the hydraulic oil 48. In this case, when the wear rate changes due to the difference in the cleanliness of the hydraulic oil 48 and the determination accuracy decreases, the threshold T is corrected based on the cleanliness, so that the determination accuracy can be improved and erroneous determination can be suppressed.

The threshold value T may be changed according to the type of ship, route, or use time. In this case, when the determination accuracy is lowered depending on the type of ship, route, or use time, the threshold T is corrected based on these factors, so that the determination accuracy can be improved and erroneous determination can be suppressed.

The threshold value T may be changed according to the temperature of the hydraulic oil 48. In this case, when the determination accuracy is lowered due to a change in the viscosity of the hydraulic oil 48, the threshold value T is corrected based on the temperature of the hydraulic oil 48, so that the determination accuracy can be improved and erroneous determination can be suppressed.

In the metering step S120, the position of the spool 12 may be changed in the neutral region and measured. In this case, the wear position of the spool 12 can be estimated from the relationship between the position of the spool 12 and the leakage amount Q.

The mounting step S110 may also include a step of mounting the flow meter 32 and the hydraulic servo valve 10 to the stem 34. In this case, even when the pipe for mounting the flow meter 32 between the hydraulic servo valve 10 and the main valve 20 is not exposed, the amount of leakage of the hydraulic oil can be easily measured.

The hydraulic servo valve 10 controls the supply of the hydraulic oil 48 to the controlled device (main valve 20), and the stem 34 may be provided between the hydraulic servo valve 10 and the controlled device. In this case, since the dedicated tube seat 34 is used, the leakage of the working oil 48 can be reduced.

The method may further include the step of outputting the measurement result of the flow meter 32 to the outside of the ship (step S140). In this case, when the measurement result is not output to the outside, the inspector needs to take labor to go to the site, and at this time, the determination can be made outside the ship (office, factory, or the like), so that the labor for the inspector to go to the site is saved. The inspector may instruct to change the threshold T according to the measurement result.

The method may further include the step of measuring the cleanliness of the hydraulic oil 48 (step S150). In this case, the total amount of work increases when the cleanliness is measured as another work, and in this case, the total amount of work decreases by including the work for measuring the cleanliness in the series of works of the diagnostic method S100.

[ 2 nd embodiment ]

Embodiment 2 of the present invention will be described with reference to fig. 3. In the drawings and the description of embodiment 2, the same or equivalent constituent elements and members as those of embodiment 1 are denoted by the same reference numerals. The description overlapping with embodiment 1 will be omitted as appropriate, and the description will focus on the structure different from embodiment 1. Embodiment 2 of the present invention is a hydraulic servo valve system 8. The system 8 includes a hydraulic servo valve 10 and a flow meter 32 for measuring a leakage amount of hydraulic oil 48 from the hydraulic servo valve 10. According to this aspect, the wear state of the hydraulic servo valve 10 can be easily diagnosed. In addition, when the device is installed in a controlled device, the amount of leakage can be directly measured in this state, and the cause of error can be reduced and the wear state can be accurately grasped as compared with the case of indirect estimation. The hydraulic servo valve system 8 may also be provided with a valve seat 34.

[ embodiment 3 ]

Embodiment 3 of the present invention will be described with reference to fig. 3. In the drawings and the description of embodiment 3, the same or equivalent constituent elements and members as those of embodiment 1 are denoted by the same reference numerals. The description overlapping with embodiment 1 will be omitted as appropriate, and the description will focus on the structure different from embodiment 1. Embodiment 3 of the present invention is a state diagnostic device 6 for a hydraulic servo valve. The condition diagnosing device 6 includes a flow meter 32 that measures the amount of leakage of the hydraulic oil 48 of the hydraulic servo valve 10, and a determining device 50 that determines the condition of the hydraulic servo valve 10 based on the measurement result of the flow meter 32. According to this aspect, the wear state of the hydraulic servo valve 10 can be easily diagnosed. Since the amount of leakage can be directly measured, the cause of error can be reduced and the condition can be diagnosed more accurately than in the case of indirect estimation.

The embodiments of the present invention have been described in detail. The above embodiments are merely specific examples for carrying out the present invention. The contents of the embodiments are not intended to limit the scope of the present invention, and many design changes such as changes, additions, deletions, and the like of the constituent elements may be made without departing from the spirit of the invention defined in the claims. In the above-described embodiments, the description is given with the expressions such as "in the embodiments" and "in the embodiments" for the contents in which such a design change is possible, but the design change is not allowed unless the contents are not the contents in which such an expression is not provided.

[ modified examples ]

Hereinafter, a modified example will be described. In the drawings and the description of the modified examples, the same or equivalent constituent elements and members as those of the embodiment are denoted by the same reference numerals. The description overlapping with the embodiment is appropriately omitted, and the description will focus on the structure different from that of embodiment 1.

In the description of embodiment 1, the example in which the hydraulic servo valve 10 is a 3-port hydraulic servo valve is shown, but the present invention is not limited to this. The hydraulic servo valve may also be another type of valve.

In the description of embodiment 1, an example of metering 1 hydraulic servo valve 10 corresponding to 1 cylinder is shown, but the present invention is not limited to this. For example, a plurality of hydraulic servo valves 10 corresponding to a plurality of cylinders may be measured simultaneously, or a plurality of hydraulic servo valves 10 corresponding to all cylinders may be measured simultaneously. In this case, the plurality of hydraulic servo valves 10 can be metered under the same condition, and the total metering time can be shortened.

In the description of embodiment 1, the example in which the cleanliness measuring step S150 is executed after the steps S110 and S120 are mounted is shown, but the present invention is not limited to this. For example, the cleanliness measuring step S150 may be performed before the mounting step S110 and the measuring step S120.

The above-described modification example achieves the same operation and effect as those of embodiment 1.

Any combination of the above-described embodiment and the modification is also useful as an embodiment of the present invention. The new embodiments resulting from the combination also have the respective effects of the combined embodiments and modified examples.