KR102405222B1 - Hydraulic servo valve state diagnostic method, hydraulic servo valve system and hydraulic servo valve state diagnostic apparatus - Google Patents

Abstract

An object of the present invention is to provide a method for diagnosing the state of a hydraulic servovalve mounted on a ship, capable of diagnosing the state of the hydraulic servovalve with high accuracy on the ship.
In the step of mounting the flow meter 32 so as to enable measurement of the leakage amount of the hydraulic oil 48 of the hydraulic servo valve 10 mounted on the ship, and in a state in which the spool 12 of the hydraulic servo valve 10 is set as a neutral region A supply step of supplying hydraulic oil 48 , a measurement step of measuring the leakage amount of hydraulic oil of the hydraulic servo valve 10 with the flow meter 32 , and a hydraulic servo valve 10 based on the measurement result of the flow meter 32 . and a determination step of determining the state of

Description

Condition diagnosis method of hydraulic servovalve, condition diagnosis device of hydraulic servovalve system and hydraulic servovalve

The present invention relates to a method for diagnosing a condition of a hydraulic servovalve, a hydraulic servovalve system, and an apparatus for diagnosing a condition of a hydraulic servovalve.

Patent Document 1 describes a technique for determining the operating state of a magnetic actuator with respect to an engine control unit provided with a fuel supply device having a magnetic actuator. In this technique, measured values of at least one magnetic property of a magnetic actuator are automatically measured, and it is judged from the measurement result whether or not the magnetic actuator is operating correctly.

Japanese Patent Laid-Open No. 2015-81606

MEANS TO SOLVE THE PROBLEM This inventor acquired the following recognition about the hydraulic servovalve which moves a spool to change the communication state between a plurality of ports.

In such a hydraulic servo valve, the spool is controlled so as to move to a region communicating between ports and a neutral region in which ports are not communicating. When the hydraulic servo valve deteriorates, even when the spool is in the neutral region, there is a slight communication between the ports, and the leakage amount of the hydraulic oil increases. If the amount of leakage increases, the operation of the connected device connected to the non-communicating port may be adversely affected. Therefore, maintenance work such as replacement or repair is required for the deteriorated hydraulic servo valve.

Hydraulic servo valves used for equipment on ships, such as ship engines, in order to avoid problems during sailing, it is desirable to grasp the need for maintenance before sailing, and to repair it in advance. For this reason, it is considered that the valve is removed and transported to an offboard factory for inspection, but this method takes a lot of time and effort and is not efficient. From these, development of the technique which can grasp|ascertain accurately whether maintenance of a hydraulic servovalve is necessary on a ship is desired. However, in the technique described in Patent Document 1, although the magnetic actuator is indirectly evaluated using the measured value of the magnetic property, the leakage amount of the hydraulic oil cannot be grasped and the diagnosis accuracy cannot be said to be high.

From these, this inventor recognized that the technique described in patent document 1 had room for improvement from a viewpoint of diagnosing a hydraulic servovalve with high precision.

Such a problem is not limited to the hydraulic servovalve used in an engine, but may also occur to the hydraulic servovalve used for other types of equipment mounted on a ship.

The present invention has been made in view of such a subject, and an object of the present invention is to provide a method for diagnosing the state of a hydraulic servo valve that can diagnose the state of the hydraulic servo valve with high accuracy on a ship.

In order to solve the above problems, the state diagnosis method of one aspect of the present invention includes a mounting step of mounting a flow meter so as to be able to measure the leakage amount of hydraulic oil of a hydraulic servo valve mounted on a ship, and a spool of the hydraulic servo valve in a neutral region It includes a supply step of supplying hydraulic oil in this state, a measurement step of measuring the leakage amount of the hydraulic oil of the hydraulic servovalve with a flowmeter, and a determination step of determining the state of the hydraulic servovalve based on the measurement result of the flowmeter.

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

In addition, any combination of the above, or a method, apparatus, program, or temporary or non-transitory storage medium or system in which the components or expressions of the present invention are recorded is also effective as a form of the present invention. do.

ADVANTAGE OF THE INVENTION According to this invention, the state diagnosis method of the hydraulic servo valve which can diagnose the state of a hydraulic servo valve with high precision on a ship can be provided.

1 is a configuration diagram schematically showing a periphery of a hydraulic servo valve to which a diagnostic method according to a first embodiment is applied.
It is a schematic diagram which shows typically the position of the valve body of the hydraulic servo valve of FIG. 1, and the opening/closing state of a port.
FIG. 3 is a view showing a state in which a leak amount measuring device is mounted on the hydraulic servo valve of FIG. 1 .
4 is a flowchart showing an example of a process of the diagnostic method according to the first embodiment.
5 is a block diagram schematically showing an example of a diagnostic system for a hydraulic servo valve to which the diagnostic method according to the first embodiment is applied.
FIG. 6 is a flowchart showing an example of a mounting step of the diagnostic method of FIG. 4 .
FIG. 7 is a flowchart showing an example of a measurement step of the diagnostic method of FIG. 4 .
Fig. 8 is a flowchart showing an example of a determination step of the diagnostic method of Fig. 4;
9 is a flowchart showing an example of a cleanliness measurement step of the diagnostic method of FIG. 4 .
It is a figure which shows the state which attached the cleanliness inspection apparatus in the cleanliness measurement step of FIG.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated, referring each drawing based on suitable embodiment. In embodiment and modified example, the same code|symbol shall be attached|subjected to the same or equivalent component and member, and a suitably overlapping description is abbreviate|omitted. In addition, in order to facilitate understanding, the dimension of the member in each figure is enlarged and reduced suitably, and is shown. In addition, in each figure, in demonstrating embodiment, a part of the member which is not important is abbreviate|omitted and displayed.

In addition, although terms including ordinal numbers such as first, second, etc. are used to describe various components, this term is used only for the purpose of distinguishing one component from other components, and by this term, the component is not limited.

[First embodiment]

With reference to drawings, the state diagnosis method S100 of the hydraulic servo valve which concerns on 1st Embodiment of this invention is demonstrated. Although diagnosis method S100 can be applied to various hydraulic servo valves, the example applied to the hydraulic servo valve 10 used for the marine engine 80 is demonstrated here.

First, the peripheral configuration of the hydraulic servo valve 10 will be described. 1 is a configuration diagram schematically illustrating a periphery of a hydraulic servo valve 10 to which a diagnosis method S100 is applied. The hydraulic servovalve 10 is connected to a controlled device such as an actuator, and changes the state of delivery of hydraulic oil 48 to the controlled device based on a command from a higher-level control device (not shown), thereby preventing Controls the operation of the control device. In this description, the hydraulic servovalve having three connection ports is exemplified as the hydraulic servovalve 10 , and the main valve 20 that controls the fuel supply amount to the marine engine 80 is exemplified as the controlled device. As shown in FIG. 1 , the hydraulic servo valve 10 is connected to the main valve 20 and functions as a pilot valve that controls the operation of the main valve 20 . The main valve 20 and the hydraulic servo valve 10 are provided in each of a plurality (for example, six) cylinders of the engine 80 .

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 penetrating the bolt B1 are drilled 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 plurality of through holes 10h are disposed at positions corresponding to the positions of the plurality of female screws 20h. By screwing the bolt B1 to the female thread 20h through the through hole 10h, the hydraulic servo valve 10 is connected to the main valve 20 . The hydraulic servo valve 10 is disconnected from the main valve 20 by removing the bolt B1 .

The hydraulic system of the main valve 20 of FIG. 1 includes a drain tank 44 that stores hydraulic oil 48 and a hydraulic pump 42 that pressurizes and delivers hydraulic oil 48 of the drain tank 44 . . The hydraulic oil 48 delivered from the hydraulic pump 42 is supplied to the inside of the main valve 20 and the hydraulic servo valve 10 through the pump-side piping portion 22p in the main valve 20 . The hydraulic oil 48 discharged from the inside of the hydraulic servo valve 10 and the main valve 20 is returned to the drain tank 44 through the tank side piping portion 22t in the main valve 20 . When the pump side piping part 22p and the tank side piping part 22t are generically called, it is called a main valve piping part.

The hydraulic servo valve 10 mainly includes a body portion 10b , a spool 12 , a port 16 , and a spool drive unit 18 . The spool 12 has a shaft 12s and a plurality of valve bodies 14 moving integrally with the shaft 12s. The spool 12 is driven by the spool drive unit 18 to advance and retreat in the first direction. Hereinafter, for convenience, the direction in which the spool 12 extends and protrudes along the first direction from the spool driving unit 18 (downward in FIG. 1 ) is referred to as “extended projection direction” and “extended projection side”, and the extension and projection direction The opposite direction is called a "semi-extended protrusion direction" and a "semi-extended protruding side".

On the extended protruding side of the spool 12, a pressing member 12h for urging the spool 12 in the semi-extending protruding direction is provided. The pressing member 12h may be, for example, a coil spring that expands and contracts in the first direction. The spool driving unit 18 includes an electronic actuator (not shown) that advances and retreats the shaft 12s in the first direction. The spool drive unit 18 advances and retreats the shaft 12s based on a command from a control device (not shown), and controls the position of the valve body 14 by balancing it with the pressing force of the pressing member 12h. .

The valve body 14 includes a first valve body 14a, a second valve body 14b, and a third valve body 14c arranged to be spaced apart from each other in the first direction. The second valve body 14b is disposed on the semi-extended protruding side of the first valve body 14a, and the third valve body 14c is disposed on the extended protruding side of the first valve body 14a. The 1st valve body 14a changes the communication state of the A port 16a mentioned later according to the position in the 1st direction. The body portion 10b has a cylindrical space 10s extending in the first direction to accommodate the spool 12 . The cylindrical space 10s functions as a cylinder surrounding the valve body 14 through the narrow gap.

A port 16 is provided in the body portion 10b. The port 16 of this embodiment includes a P port 16p, an A port 16a, and a T port 16t. The P port 16p is connected to the pump side piping part 22p, and the hydraulic oil 48 pressurized from the hydraulic pump 42 is supplied. The A port 16a is connected to the hydraulic oil storage part 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 accommodating part 22a. The T port 16t is connected to the tank side piping portion 22t, and the hydraulic oil 48 flowing through the main body portion 10b is discharged to the drain tank 44 through the tank side piping portion 22t.

FIG. 2 : is a schematic diagram which shows typically the position of the 1st direction of the valve body 14 of the hydraulic servo valve 10, and the opening and closing state of a port. In this drawing, description of elements that are not important to the description is omitted. Fig. 2(a) shows a state in which the valve body 14 is located in a first region that communicates the A port 16a and the P port 16p. In this state, the A port 16a supplies the hydraulic oil 48 from the P port 16p to the hydraulic oil accommodating part 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 accommodating portion 22a of the main valve 20 . By this operation, for example, the main valve 20 operates to increase the amount of fuel supplied to the engine 80 .

Fig. 2(b) shows a state in which the valve body 14 is positioned in a neutral region that blocks the A port 16a and does not communicate with the P port 16p and the T port 16t. In this state, the A port 16a is shut off, and neither supply nor recovery is performed to the hydraulic oil accommodating portion 22a (hereinafter referred to as "neutral mode"). In the neutral mode, the hydraulic pressure of the hydraulic oil accommodating portion 22a of the main valve 20 is maintained in the state immediately before the valve body 14 is positioned in the neutral region. By this operation, for example, the main valve 20 operates so as to maintain the fuel supply amount to the engine 80 in the immediately preceding state.

Fig. 2(c) shows a state in which the valve body 14 is located in the second region that connects the A port 16a and the T port 16t. In this state, the A port 16a recovers the hydraulic oil 48 from the hydraulic oil accommodating portion 22a and returns it to the pump-side piping portion 22p (hereinafter referred to as "recovery mode"). In the recovery mode, the hydraulic oil 48 of the hydraulic oil accommodating portion 22a of the main valve 20 is recovered to the drain tank 44 through the A port 16a, the T port 16t, and the tank side piping portion 22t. do. By this operation, for example, the main valve 20 operates to reduce the amount of fuel supplied to the engine 80 .

In this way, the hydraulic servo valve 10 and the main valve 20 can adjust the fuel supply amount to the engine 80 by controlling the position of the valve body 14 in the spool drive unit 18 . However, when these valves are used for a long time, the valve body 14 is worn. When the valve body 14 is worn, the integrity as a valve will fall, and even in a neutral mode, the A port 16a, P port 16p, and T port 16t communicate with each other slightly.

In the neutral mode, when the hydraulic oil 48 leaks from the P port 16p to the A port 16a, the oil pressure in the hydraulic oil accommodating portion 22a gradually rises to increase the fuel supply to the engine 80, and the engine (80) causes deterioration of fuel economy.

In addition, in the neutral mode, when the hydraulic oil 48 leaks from the A port 16a to the T port 16t, the hydraulic oil pressure in the hydraulic oil accommodating portion 22a is gradually lowered to decrease the fuel supply to the engine 80 , , causing a decrease in the output of the engine 80 .

As the usage time of the hydraulic servo valve 10 increases, the wear of the valve body 14 progresses, and the leakage amount of the hydraulic oil 48 of the hydraulic servo valve 10 (hereinafter simply referred to as "leakage amount") increases. . When the leakage amount exceeds the allowable amount, the hydraulic servo valve 10 and the main valve 20 do not function normally, leading to a failure. That is, if the leakage amount can be grasped with high accuracy, an unexpected failure can be avoided by replacing or repairing the hydraulic servovalve 10 before the leakage amount exceeds the allowable amount.

Next, with reference to FIGS. 3-5, the diagnosis method S100 of this embodiment is demonstrated. 3 : is a figure which shows the state which attached the leak amount measuring device 30 to the hydraulic servo valve 10. As shown in FIG. 4 is a flowchart showing an example of the method S100 for diagnosing the state of the hydraulic servo valve. Diagnosis method S100 mainly includes a mounting step S110, a measurement step S120, and a determination step S130. 5 is a block diagram showing an example of the diagnosis system 1 of the hydraulic servo valve 10 to which the diagnosis method S100 is applied.

In terms of hardware, each functional block shown in Fig. 5 can be realized by electronic elements and mechanical parts including the CPU of a computer, and in terms of software, it is realized by a computer program or the like. A functional block is drawn. Accordingly, it is understood by those skilled in the art that these functional blocks can be realized in various forms by a combination of hardware and software.

(Leakage measuring device)

In the diagnosis method S100, the leakage amount is measured in a state in which the leakage amount measuring device 30 is installed in the hydraulic servo valve 10 and the main valve 20 . For this reason, the leak amount measuring device 30 is demonstrated first. As shown in FIG. 3 , the leak amount measuring device 30 includes a flow meter 32 , a pipe sheet 34 , and a determination device 50 . The flow meter 32 measures the amount of the hydraulic oil 48 leaked 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 measured value of the flow meter 32 .

As the flow meter 32, the amount of leak can be measured, and the liquid-free type using ultrasonic waves, electromagnetic waves, etc. may be sufficient, and the liquid-contact type using an impeller etc. may be sufficient as it. The flow meter 32 of this embodiment measures the amount of leakage from the flow rate of the hydraulic oil 48 using ultrasonic waves. In this case, since it does not affect the flow of the hydraulic oil 48, the error factor of measurement can be reduced.

As shown in Fig. 3, the pipe sheet 34 includes a body portion 34b in the shape of a thick plate, a first pipe sheet pipe 34p punched in the body portion 34b, and a second pipe sheet pipe 34m. and a third pipe sheet pipe 34n. When the first to third pipe sheet pipes 34p, 34m, and 34n are generically called, they are referred to as pipe sheet pipes. In the pipe sheet 34, a plurality of (for example, four) through holes 34h for penetrating the bolts are perforated in the thickness direction. The plurality of through-holes 34h are disposed at positions corresponding to the positions of the plurality of through-holes 10h. The first pipe sheet piping 34p extends in the thickness direction of the main body portion 34b and connects the P port 16p of the hydraulic servo valve 10 and the pump side piping portion 22p of the main valve 20 . connect The first pipe sheet pipe 34p guides the hydraulic oil 48 from the hydraulic pump 42 to the P port 16p.

The second pipe sheet pipe 34m has one end connected to the T port 16t of the hydraulic servo valve 10 , and the other end connected to the inlet portion 32e of the flow meter 32 . The third pipe sheet pipe 34n has one end connected to the tank side piping portion 22t of the main valve 20 , and the other end connected to the outlet portion 32f of the flow meter 32 . That is, the second pipe sheet pipe 34m guides the hydraulic oil 48 leaked from the T port 16t of the hydraulic servo valve 10 to the flow meter 32, and the third pipe sheet pipe 34n, The hydraulic oil 48 that has passed through the flow meter 32 is guided to the tank side piping portion 22t. By being configured in this way, the flow meter 32 can measure the amount of leakage of the hydraulic oil 48 from the T port 16t.

In addition, the pipe seat 34 has a shape that blocks the A port 16a of the hydraulic servo valve 10 and the hydraulic oil accommodating portion 22a of the main valve 20 . That is, in the state in which the pipe sheet 34 is mounted, the A port 16a and the hydraulic oil accommodating part 22a are blocked by the pipe sheet 34 .

(Mounting step)

The mounting step S110 will be described with reference to FIGS. 3, 4, and 6 . 6 : is a flowchart which shows an example of attachment step S110. In this step, in order to attach the leak amount measuring device 30 to the hydraulic servo valve 10 and the main valve 20, the following process is performed on board.

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

(2) Next, the pipe seat 34 is connected with the hydraulic servo valve 10 and the main valve 20 in a state sandwiched therebetween (step S114). Specifically, in a state in which the pipe seat piping corresponds to the main valve piping portion and the port 16, the plurality of bolts B2 are screwed to the female thread 20h through the through hole 34h and the through hole 10h. do. The bolt B2 may be longer than the bolt B1 so as to correspond to the thickness of the pipe sheet 34 .

(Measurement step)

Measurement step S120 is demonstrated with reference to FIG. 3, FIG. 4, and FIG. 7 : is a flowchart which shows an example of measurement step S120. Step S120 includes a step of closing the A port 16a , a step of supplying the hydraulic oil 48 to the hydraulic servo valve 10 , and a step of measuring the leakage amount with the flow meter 32 . In step S120, the following process is performed with respect to the hydraulic servovalve 10 to which the leak amount measuring device 30 was attached.

(1) The spool drive unit 18 is controlled so that the valve body 14 is located in the neutral region. For example, a command for moving the valve body 14 to the neutral region is output from the upper-level control device to the spool drive unit 18 (step S122).

(2) The hydraulic oil 48 is supplied from the hydraulic pump 42 to the P port 16p through the pump-side piping portion 22p (step S124). In this step, the hydraulic oil 48 is continuously supplied for a predetermined period (for example, 30 minutes, 1 hour, etc.). At this time, the hydraulic oil 48 may be supplied from the hydraulic pump for testing provided separately from the hydraulic pump 42, but in this embodiment, the hydraulic oil 48 is supplied from the hydraulic pump 42 used at the time of the normal operation of the ship. . In this case, since measurement can be performed under normal use conditions, measurement errors due to differences in conditions can be reduced.

(3) While the hydraulic oil 48 is being 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 measurement period of the leakage amount may be extended or shortened in consideration of a time lag or the like.

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

(judgment step)

The determination step S130 will be described with reference to FIG. 3, FIG. 4, and FIG. 8 is a flowchart showing an example of determination step S130. In this step, the determination device 50 determines whether maintenance of the hydraulic servovalve 10 is necessary based on the measurement result of measurement step S120 .

(judging device)

The determination apparatus 50 is demonstrated with reference to FIG.3, FIG.5. Although the determination device 50 may be provided separately from the leak amount measuring device 30, it is provided integrally in this example. 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, It has an output part 50h.

The operation result acquisition part 50b acquires the operation result of 30 s of operation parts. The operation unit 30s is provided, for example, in the leak amount measurement device 30 and accepts operator operations such as starting/stopping of the determination device 50 , display of a determination result, and output of a measurement result or determination result. The operation unit 30s may be a touch panel.

The measured value acquisition part 50c acquires the measured value of the flow meter 32 . The determination part 50e determines whether maintenance of the hydraulic servovalve 10 is necessary based on the acquisition result of the measured value acquisition part 50c. The display control unit 50d causes the display device 52 to display the determination result of the determination apparatus 50 . The display device 52 may be, for example, a liquid crystal display unit provided integrally with the operation unit 30s.

The storage unit 50m stores a threshold value (to be described later), an acquisition result of the measurement value acquisition unit 50c, a judgment 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 or the determination result of the determination device 50 to a network server via the Internet or the like, and the information terminal ( 54) may be sent.

Determination step S130 is started when the operator performs an operation of starting determination processing from the operation unit 30s. When determination step S130 is started, the determination apparatus 50 will acquire the measured value (henceforth "measured value V") of the flow meter 32 (step S132). In this step, the measurement value acquisition part 50c acquires the measurement value V for a predetermined period (for example, 30 minutes, 1 hour), and makes it memorize|store in the storage part 50m.

When the measurement value V of the flow meter 32 is acquired, the determination device 50 calculates the leakage amount per unit time (henceforth "leakage amount Q") from the measurement value V (step S134). In this step, the determination part 50e divides the accumulated value of the measured value V by the measurement time, calculates the leak amount Q, and makes it memorize|store in the storage part 50m. In addition, in this embodiment, the measurement result of a flowmeter is illustrated by the leakage amount Q.

When the leakage amount Q is calculated, the determination device 50 classifies the leakage amount Q into a plurality of divisions based on the threshold value T (step S136). A stable judgment result can be obtained by classifying by threshold value T. One threshold value T may be sufficient and it may contain several threshold value. By using a plurality of thresholds, more appropriate judgment results can be obtained. In this embodiment, threshold value T contains 1st threshold value T1 and 2nd threshold value T2, and the determination apparatus 50 classifies and determines leakage amount Q into three divisions. For example, 1st threshold value T1 may be set to the level of maintenance-free, when leakage amount Q is 1st threshold value T1 or less. In addition, if the leak amount Q exceeds the 2nd threshold value T2, 2nd threshold value T2 may be set to the level which needs maintenance quickly.

When the leakage amount Q is classified, the determination device 50 determines the necessity of maintenance based on the classification result (step S138). For example, if the leakage amount Q is less than or equal to the first threshold T1, it is determined that maintenance is unnecessary, and when it exceeds the first threshold T1 and is less than or equal to the second threshold T2, it is determined that repair is necessary within a predetermined period, and exceeds the second threshold T2. In this case, it may be determined that repair is necessary quickly. The determination device 50 stores this determination result (hereinafter referred to as "determination result R") in the storage unit 50m.

If the necessity of maintenance is determined, 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 leakage amount Q and the determination result R to the outside of the ship. For example, you may transmit these information to the information terminal of the inspector outside a ship.

If the determination result R is output, the determination apparatus 50 will end determination step S130. Next, the process of diagnostic method S100 is complete|finished by removing the leak amount measuring device 30 and installing the hydraulic servo valve 10 to the main valve 20. As shown in FIG. These steps of the diagnosis method S100 are merely examples, and other steps may be added, some steps may be changed or deleted, or the order of the steps may be changed.

(threshold)

The threshold value T is demonstrated. Although the threshold value T may be fixed to a preset value, since the situation of abrasion differs according to various factors, you may change the threshold value T according to these factors. Hereinafter, the relationship between some factors and threshold T is demonstrated.

Threshold T may be made small when the advancing speed of wear is fast, and may be made large when it is slow. The progress rate of wear can be calculated by dividing the difference in the amount of leakage Q calculated from the measurement results at different times in the past (eg, the initial stage and after one year has elapsed) by the time difference (period) at the other time points. In addition, the threshold value T may be made small when the frequency of use of the hydraulic servovalve 10 is high, and may be made large when it is low. In this embodiment, he is trying to change the threshold value T according to the measurement result in the past and the use history of the hydraulic servo valve 10 at another time point.

The progress of wear is correlated with the cleanliness (content of foreign matter) of the hydraulic oil 48 . As a result of this inventor's examination, it became clear that the abrasion of the valve body 14 was accelerated|stimulated, so that foreign materials, such as a metal powder (it may be called contamination) contained in the hydraulic oil 48 increased. From these, the threshold value T may be made small when the cleanliness of the hydraulic oil 48 is low (= there is much foreign material content), and may be made large when the cleanliness is high (= there is little foreign material content). In this embodiment, the threshold value T is changed according to the cleanliness of the hydraulic oil 48. In addition, the process of measuring the cleanliness of the hydraulic oil 48 is mentioned later.

The progress of wear differs with the frequency of acceleration or deceleration of a ship. In addition, the progress of wear differs depending on the temperature or humidity of the route of the ship, or the state of the weather. In addition, the progress of wear is different depending on the use time of the ship. From these, in this embodiment, the threshold value T is changed according to the kind of ship, a route, or usage time. As an example, the threshold value T is made small when the type of ship, route, or use time promotes the progress of wear, and when it is difficult to accelerate the wear, the threshold value T is increased.

The viscosity of the hydraulic oil 48 changes according to the temperature of the hydraulic oil 48 . For example, when it is high temperature and a viscosity is low, the lubricity of the hydraulic oil 48 may fall, and also when it is low temperature and fluidity|liquidity is low, lubricity may fall. Therefore, progress of abrasion differs with the temperature of the hydraulic oil 48. As shown in FIG. From these, in this embodiment, threshold value T is changed according to the temperature of the hydraulic oil 48. As an example, the threshold value T is made small in the range where the temperature of the hydraulic oil 48 accelerates|stimulates progress of wear, and when it is difficult to accelerate|stimulate progress of wear, the threshold value T is made large.

(Cleanliness measurement process)

The process of measuring the cleanliness of the hydraulic oil 48 is demonstrated with reference to FIG.9, FIG.10. This process includes cleanliness measurement step S150 of measuring the cleanliness of the hydraulic oil 48 . The cleanliness measurement step S150 may be executed separately from the process of the diagnosis method S100. In this description, an example in which step S150 is executed is shown in a series of processes of the diagnosis method S100 after the end of the above-described determination step S130.

9 is a flowchart showing cleanliness measurement step S150. FIG. 10 is a diagram showing a state in which the cleanliness inspection device 36 is attached to the main valve 20 in cleanliness measurement step S150. In this step, the cleanliness of the hydraulic oil is inspected in this state. Accordingly, the cleanliness inspection device 36 will be described first.

(cleanliness inspection device)

As shown in FIG. 10 , the cleanliness inspection device 36 includes a foreign material inspection device 38 and a pipe sheet 40 . What is necessary is just to be able to test|inspect the cleanliness of the hydraulic oil 48, and the foreign material inspection apparatus 38 counts the number of foreign materials optically, and inspects the cleanliness. The pipe seat 40 is for connecting the foreign material inspection device 38 between the pump-side piping portion 22p and the tank-side piping portion 22t of the main valve 20 .

The pipe sheet 40 includes a body portion 40b having the same external shape as the pipe sheet 34, a first pipe sheet pipe 40p punched in the body portion 40b, and a second pipe sheet pipe 40m. has A plurality of through holes 40h for penetrating the bolt B2 are perforated in the pipe sheet 40 . The plurality of through holes 40h are disposed at positions corresponding to the positions of the plurality of female screws 20h. The pipe seat 40 is connected to the main valve 20 by screwing the bolt B2 to the female thread 20h through the through hole 40h, and from the main valve 20 by removing the bolt B2. are separated

In addition, when performing a hydraulic oil test|inspection, although you may remove and temporarily arrange|position the hydraulic servovalve 10, there exists a problem that handling of the hydraulic servovalve 10 takes unnecessary effort when provisionally arrange|positioned. For this reason, in the example of FIG. 10, the hydraulic servo valve 10 is also connected with the pipe seat 40. As shown in FIG. In addition, it is not essential to connect the hydraulic servo valve 10, and you may connect only the pipe seat 40 using short bolts.

The first pipe seat pipe 40p connects the pump side pipe part 22p of the main valve 20 and the inlet part 38e of the foreign material inspection device 38, and the hydraulic oil from the hydraulic pump 42 ( 48) is introduced into the foreign material inspection device 38 . The second pipe sheet pipe 40m connects the tank side piping portion 22t of the main valve 20 and the outlet portion 38g of the foreign material inspection device 38 to the hydraulic oil from the foreign material inspection device 38 . (48) is discharged to the drain tank (44).

In cleanliness measurement step S150, first, the leakage amount measurement device 30 is separated from the main valve 20 (step S152). In this step, the bolt B2 is 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 test|inspection apparatus 36 is attached to the main valve 20 (step S154). Specifically, in a state in which the first pipe sheet pipe 40p and the second pipe sheet pipe 40m correspond to the pump side pipe part 22p and the tank side pipe part 22t, the plurality of bolts B2 are It is screwed into the female screw 20h through the through hole 40h.

Next, the hydraulic oil 48 is supplied from the hydraulic pump 42 to the foreign material inspection apparatus 38 (step S156). Specifically, by operating the hydraulic pump 42 , the hydraulic oil 48 is introduced into the inlet portion 38e of the foreign material inspection device 38 through the pump-side piping portion 22p , and the exit of the foreign material inspection device 38 . The hydraulic oil 48 from the portion 38g is discharged to the drain tank 44 through the tank-side piping portion 22t. In this case, since inspection can be performed under normal use conditions, inspection errors due to differences in conditions can be reduced.

Next, while the hydraulic oil 48 is being supplied to the foreign material inspection apparatus 38 in step S156, the cleanliness of the hydraulic oil 48 is inspected by the foreign material inspection apparatus 38 (step S158). In this step, the foreign material inspection device 38 inspects the total number and size of the foreign material at a predetermined time interval, and displays the inspection result (hereinafter referred to as inspection result U).

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

Next, the process of cleanliness measurement step S150 is complete|finished by removing the foreign material inspection apparatus 38 and installing the hydraulic servo valve 10 in the main valve 20. As shown in FIG.

Next, measurement step S120 is demonstrated in more detail. In measurement step S120 of this embodiment, in the neutral area|region, the position of the spool 12 is changed to several places, and it is measuring. In this case, the wear position of the spool 12 can be estimated from the difference in the leakage amount of each of the plurality of locations.

For example, the spool 12 may be moved to the first position, the central position, and the second position of the semi-extended protrusion side end in the neutral region to measure the leakage amount Q at each position. When the leakage amount Q at the first position is larger than the leakage amount Q at the second position, it can be determined that the extended protruding side of the valve body 14 is worn out than the semi-extended protruding side, and when it is small, the semi-extended protruding side It can be judged that it is worn more than this extended protrusion side.

In addition, the spool 12 may be moved from a 1st position to a 2nd position in multiple points, and the leakage amount Q may be measured at each point. In this case, by plotting the leakage amount Q at each point, the wear location of the spool 12 can be grasped|ascertained more precisely. In addition, the minimum position at which the leakage amount Q in the neutral region is minimized can be specified.

In addition, the spool 12 may be moved gradually from a 1st position to a 2nd position, and the leak amount Q in movement may be measured. In this case, by plotting the leakage amount Q with respect to the position of the spool 12, the minimum position of the leakage amount in the neutral region can be specified with high accuracy. By controlling the position of the spool 12 to the specified minimum position, the amount of leakage of the hydraulic servo valve 10 can be reduced compared to the case of controlling to the initial central position.

The operation and effect of the present embodiment described above will be described. The state diagnosis method S100 of the hydraulic servovalve of the present embodiment includes a step S110 of attaching the flow meter 32 so as to be able to measure the leakage amount of the hydraulic oil of the hydraulic servovalve 10 mounted on the ship, and the hydraulic servovalve 10 A step of supplying hydraulic oil 48 in a state in which the spool 12 of and a determination step S130 of determining the state of the hydraulic servo valve based on the measurement result.

According to this aspect, since the hydraulic servovalve of the state mounted on a ship is diagnosed on a ship, compared with the case where a valve is transferred overboard and test|inspected, the number of work man-hours can be suppressed and an inspection period becomes short. In addition, since the leakage amount of hydraulic oil is directly measured with respect to the valve in the state mounted on the ship, the error factor is reduced compared to the case of indirect estimation, and the wear state can be accurately grasped. In addition, since it is quantitatively determined whether or not maintenance of the hydraulic servo valve is necessary based on the measurement result, the determination accuracy can be improved compared to the case of qualitative determination.

The hydraulic servovalve has a P port that receives supply of hydraulic oil, an A port that outputs hydraulic oil, and a T port that discharges hydraulic oil, and measurement step S120 may include a step of closing the A port 16a. In this case, it is possible to prevent the main valve 20 from malfunctioning due to the hydraulic oil 48 flowing out from the A port 16a to the main valve 20 . 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 determination step S130, you may classify the measurement result (leakage amount Q) into a plurality of divisions based on the threshold value T. In this case, a stable judgment result can be obtained by classifying based on the threshold value T. By classifying into a plurality of divisions, more flexible and accurate judgment results can be obtained.

You may change the threshold value T according to the measurement result (leakage amount Q) and the usage history of the hydraulic servovalve 10 at a different time point. In this case, the wear rate changes due to the change rate of the leakage amount Q or the difference in the usage history, and the determination accuracy is lowered. can do.

You may change the threshold value T according to the cleanliness of the hydraulic oil 48. In this case, the wear rate is changed due to the difference in the cleanliness of the hydraulic oil 48 and the determination precision is lowered. By correcting the threshold value T according to the cleanliness, the determination accuracy can be improved and erroneous determination can be suppressed.

The threshold T may be changed according to the type of vessel, route, or time of use. In this case, the judgment precision is lowered due to the type of ship, the route, or the use time. By correcting the threshold value T according to these factors, the judgment precision can be improved and erroneous judgment can be suppressed.

You may change the threshold value T according to the temperature of the hydraulic oil 48. In this case, since the determination accuracy is lowered due to the change in the viscosity of the hydraulic oil 48, by correcting the threshold value T according to the temperature of the hydraulic oil 48, the determination accuracy can be improved and erroneous determination can be suppressed.

In measurement step S120, you may change and measure the position of the spool 12 in a neutral area|region. 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 amount of leakage Q.

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

The hydraulic servovalve 10 controls the supply of hydraulic oil 48 to the controlled device (main valve 20), and the pipe seat 34 is provided between the hydraulic servovalve 10 and the controlled device. also be In this case, since the dedicated pipe sheet 34 is used, oil leakage of the hydraulic oil 48 can be reduced.

You may further include the step (step S140) of outputting the measurement result of the flowmeter 32 to the exterior of a ship. In this case, when the measurement result is not output to the outside, the labor of the inspector to go to the site is required. Since the judgment can be made from the outside of the ship (office, factory, etc.), the labor of the inspector going to the site can be reduced. Moreover, it becomes possible for an inspector to issue an instruction|indication of the threshold value T change according to a measurement result.

You may further include the step (step S150) of measuring the cleanliness of the hydraulic oil 48. In this case, if the cleanliness is measured as a separate operation, the total amount of work is increased. Therefore, the total amount of work is reduced by including the work of measuring the cleanliness in the diagnostic method S100 series of tasks.

[Second embodiment]

A second embodiment of the present invention will be described with reference to FIG. 3 . In the drawings and description of the second embodiment, the same or equivalent components and members as those of the first embodiment are denoted by the same reference numerals. The description overlapping with the first embodiment will be omitted appropriately, and a configuration different from the first embodiment will be mainly described. The second embodiment 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 the leakage amount of the hydraulic oil 48 of the hydraulic servo valve 10 . According to this aspect, the wear state of the hydraulic servo valve 10 can be diagnosed easily. In addition, when installed in the controlled device, since the leakage amount can be directly measured in that state, the error factor is reduced compared to the case of indirect estimation, so that the wear state can be accurately grasped. The hydraulic servovalve system 8 may include a pipe seat 34 .

[Third embodiment]

A third embodiment of the present invention will be described with reference to FIG. 3 . In the drawings and description of the third embodiment, the same or equivalent components and members as those of the first embodiment are denoted by the same reference numerals. The description overlapping with the first embodiment is omitted appropriately, and a configuration different from the first embodiment will be mainly described. A third embodiment of the present invention is a condition diagnosis device 6 for a hydraulic servo valve. The state diagnosis device 6 determines the state of the hydraulic servo valve 10 based on the flow meter 32 measuring the leakage amount of the hydraulic oil 48 of the hydraulic servo valve 10 and the measurement result of the flow meter 32 . A determination device 50 is provided. According to this aspect, the wear state of the hydraulic servo valve 10 can be diagnosed easily. Since the amount of leakage can be measured directly, the error factor is reduced compared to the case of indirect estimation, so that the state can be diagnosed accurately.

As mentioned above, the example of embodiment of this invention was demonstrated in detail. All of the above-described embodiments merely illustrate specific examples for carrying out the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of constituent elements are possible without departing from the spirit of the invention defined in the claims. In the above-described embodiment, contents that can be changed in such a design are described with notations such as “in the embodiment” and “in the embodiment”, but design changes are not allowed for contents without such notation not.

[Variation]

Hereinafter, a modified example is demonstrated. In the drawings and description of the modified example, the same reference numerals are assigned to the same or equivalent components and members as in the embodiment. The description overlapping with the embodiment is omitted appropriately, and a configuration different from the first embodiment will be mainly described.

In the description of the first embodiment, the example in which the hydraulic servovalve 10 is a three-port hydraulic servovalve was shown, but the present invention is not limited thereto. The hydraulic servo valve may be a valve of another type.

In the description of the first embodiment, an example of measurement for one hydraulic servovalve 10 corresponding to one cylinder was shown, but the present invention is not limited thereto. For example, a plurality of hydraulic servo valves 10 corresponding to multiple cylinders may be simultaneously measured, or a plurality of hydraulic servo valves 10 corresponding to all cylinders may be simultaneously measured. In this case, the plurality of hydraulic servo valves 10 can be measured under the same conditions, and the overall measurement time can be shortened.

In the description of the first embodiment, although the example in which cleanness measurement step S150 is performed after installation step S110 or measurement step S120 was shown, this invention is not limited to this. For example, cleanliness measurement step S150 may be performed before installation step S110 or measurement step S120.

The above-described modified example exhibits the same actions and effects as those of the first embodiment.

Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiment generated by the combination has both the effects of the combined embodiment and the modified example.

10: hydraulic servo valve
12: spool
14: valve body
16: port
16a: A port
16p: P port
16t: T port
18: spool drive unit
20: main valve
30: leak measurement device
32: flow meter
34: pipe sheet
36: cleanliness inspection device
38: foreign material inspection device
40: pipe sheet
42: hydraulic pump
44: drain tank
48: hydraulic oil
50: judgment device
S100: How to diagnose

Claims (13)

It has a P port for receiving the supply of hydraulic oil, an A port for outputting the hydraulic oil to the main valve, and a T port for discharging the hydraulic oil. A mounting step of mounting a flow meter to connect the T port and the main valve to enable measurement;
blocking the A port;
a supply step of supplying the hydraulic oil to the P port in a state in which the spool of the hydraulic servo valve is in a neutral region;
a measuring step of measuring the leakage amount of hydraulic oil discharged from the T port of the hydraulic servo valve with the flow meter;
A determination step of determining the state of the hydraulic servo valve based on the measurement result of the flow meter
A method for diagnosing the condition of a hydraulic servo valve, including. The method for diagnosing a condition of a hydraulic servo valve according to claim 1, wherein in the determination step, the measurement result is classified into a plurality of categories based on a threshold value. The method for diagnosing the state of a hydraulic servovalve according to claim 2, wherein the threshold value is changed according to a measurement result at different time points and a history of use of the hydraulic servovalve. The method for diagnosing a condition of a hydraulic servo valve according to claim 2 or 3, wherein the threshold value is changed according to the cleanliness of the hydraulic oil. The method for diagnosing the condition of a hydraulic servo valve according to claim 2 or 3, wherein the threshold value is changed according to the type of the vessel, the route, or the use time. The method for diagnosing a condition of a hydraulic servo valve according to claim 2 or 3, wherein the threshold value is changed according to the temperature of the hydraulic oil. The method for diagnosing a condition of a hydraulic servo valve according to any one of claims 1 to 3, wherein, in the measurement step, the position of the spool is changed in the neutral region for measurement. The method for diagnosing a condition of a hydraulic servovalve according to any one of claims 1 to 3, wherein the mounting step includes installing the flowmeter and the hydraulic servovalve on a pipe seat. The method for diagnosing a condition of a hydraulic servo valve according to any one of claims 1 to 3, further comprising the step of outputting the measurement result of the flow meter to the outside of the ship. The method for diagnosing a condition of a hydraulic servo valve according to any one of claims 1 to 3, further comprising the step of measuring the cleanliness of the hydraulic oil. A condition diagnosis apparatus for a hydraulic servo valve used in the condition diagnosis method according to claim 1 . delete delete

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