JP2011231924A5 - - Google Patents

Description

Hydraulic circuit, stop valve used therefor, and maintenance method of hydraulic circuit

The present invention, floodgates, construction machines, a hydraulic cylinder for driving the industrial machinery, hydraulic drive device such as a hydraulic motor (hereinafter also referred to as hydraulic cylinder.) Hydraulic circuits of stop used in the hydraulic circuit The present invention relates to a valve and a maintenance method of a hydraulic circuit.

  2. Description of the Related Art Conventionally, a hydraulic circuit that opens and closes a stop valve provided in the middle of a supply / discharge pipe connected to the hydraulic cylinder and drives the cylinder, vents and discharges air from the cylinder and fills hydraulic oil is known. It is.

  For example, in the fluid pressure circuit disclosed in Patent Document 1, a pair of hydraulic oil supply / discharge ports is provided in a hydraulic cylinder, and one of the pair of ports and a discharge port of the hydraulic pump are connected to each other. The first port is connected via a poppet valve, and the other port is connected to the drain path via a second poppet valve. With such a configuration, the first poppet valve and the second poppet valve are opened and closed, and the hydraulic cylinder is driven, the air supply / discharge pipe, the air is discharged from the cylinder, and the hydraulic oil is filled.

JP 2003-194209 A

However, the fluid pressure circuit structure disclosed in Patent Document 1 is visually inspected from end to end of the supply / exhaust pipe even when there is a suspicion of damage to the supply / exhaust pipe due to a disaster such as an earthquake or aging. There was a need. In particular, when used for large-scale applications such as sluice gates, the supply and discharge pipes can be long distances and in some cases buried pipes. There was a problem of hanging. Also, when venting the air in the supply / exhaust pipe and cylinder or filling the hydraulic oil, the hydraulic oil is filled in the long supply / exhaust pipe. Cause malfunctions. In order to prevent the air to thus cavitation mixed into hydraulic oil returned to the oil tank, it is necessary to pull out the air from the hydraulic fluid fed back, there is a problem that correspondingly labor and time it takes It was.

The present invention has been made in view of the above problems, and by dividing the supply / exhaust pipe into a plurality of section circuits, it is possible to inspect abnormalities occurring in the supply / exhaust pipe, and to vent the supply / exhaust pipe and to fill hydraulic fluid. a hydraulic circuit which is capable of maintenance, such as time without a short time, an object and the stop valve used therein, to provide a maintenance how the hydraulic circuit.

Hydraulic circuit of the present invention, sluices, a hydraulic driving device for driving an object to be operated device, such as industrial machinery, a hydraulic source that discharges hydraulic oil for driving the hydraulic drive system, the hydraulic source is connected the hydraulic drive an oil tank hydraulic oil of the apparatus is fed back, the direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive apparatus provided between said hydraulic pressure source and an oil tank and the hydraulic drive system, wherein the oil tank hydraulic fluid from the hydraulic fluid pressure source is discharged is supplied to the hydraulic drive system wherein the hydraulic drive system by Yes operation of the direction switching valve is provided between said direction switching valve hydraulic drive system a feed and discharge pipe for fed back to the hydraulic circuit configuration which includes a plurality of sections in the supply and discharge line more the paper is provided with a plurality the exhaust pipe valve having a function for opening and closing the supply and discharge line A pressure gauge is installed in the circuit and the plurality of section circuits. Hydraulic circuit, wherein the multi-purpose port, that was provided for.

According to the above configuration, the section circuit in which the supply / discharge pipe connecting the direction switching valve and the hydraulic drive device is divided by the plurality of stop valves is the upstream and downstream of the plurality of section circuits continuous by the stop valves. Both ends can be closed and made independent as a zone circuit. For this reason, for example, by making the connected section circuit in a certain state (a state in which the pressure of the hydraulic oil is sealed or a state in which it is kept in a vacuum), it is not affected by other section circuits and is repaired, filled with hydraulic oil, or damaged. Since the part can be detected, the state of the hydraulic circuit such as the identification of the damaged part can be quickly grasped, and the maintenance time of the hydraulic circuit can be shortened.

  The hydraulic circuit according to the present invention is characterized in that at least one of the section circuits is provided at both ends of a hose interposed in the middle of the supply / discharge pipe and is constituted by a stop valve.

  According to said structure, since the length of a supply / exhaust pipe can be provided with a hose, it can respond also to the tensile force which arises in a supply / exhaust pipe, for example by the change of the ground. Further, when repairing the hose, the both ends of the hose are shut off by the stop valves provided at both ends of the hose, so that the efficiency of the recovery work can be greatly improved. In addition, since it is possible to divide only the hose with a stop valve and perform abnormality handling / inspection, it is possible to focus on the hose that is easily broken due to wear or the like and to deal with abnormality / inspection.

  The hydraulic circuit of the present invention is characterized in that the multipurpose port and the stop valve are integrally formed.

  According to said structure, it is more compact than each of a stop valve and a multipurpose port being provided separately. Thereby, an installation space can be made small. Further, when there is an abnormality only in the supply / discharge pipe before and after the stop valve, it is not necessary to install the pressure detection port again, which is economically advantageous.

The check valve employed in the hydraulic circuit of the present invention, a hydraulic drive system for driving floodgates, to be operated device, such as industrial machinery, a hydraulic source that discharges hydraulic oil for driving the hydraulic drive system, said hydraulic source direction but to control the hydraulic tank, the supply and discharge direction of the hydraulic fluid to the hydraulic drive system and the is provided with between the hydraulic pressure source and an oil tank the hydraulic drive system for feeding back the hydraulic fluid connection to the hydraulic drive apparatus and a switching valve to supply the hydraulic fluid the hydraulic source is ejected by Yes operation of the direction switching valve provided between the hydraulic drive device and the direction switching valve to the hydraulic drive system, operating from the hydraulic drive system A hydraulic circuit comprising a supply and discharge pipe for returning oil to the oil tank, and a stop valve having a valve body connected to the supply and discharge pipe of the hydraulic circuit is provided in the valve body, and the supply and discharge pipe is Port to connect to the valve body A valve body that is movably provided and opens and closes between the ports, a rotary shaft that is provided on the valve body and operates to open and close the valve body between the ports, and a flow path that is connected to the port In addition to the provision of a joint having a self-sealing function, a multipurpose port is provided .

According to stop valve used in the hydraulic circuit of the above configuration, it is possible to form the wards between circuits having a multi-purpose port only by providing a stop valve in Kyuhaikan, constituting a section circuit by installing a check valve At the same time, a section circuit with a multipurpose port can be created. For this reason, it is not necessary to install a multipurpose port after the section circuit is formed. In addition, since the multipurpose port includes a joint having a self-sealing function, the gas in the section circuit can be discharged by releasing the self-sealing function after forming the section circuit. Furthermore, the multipurpose port can measure the pressure in the section circuit by connecting a pressure gauge to the multipurpose port, and can grasp the situation such as leakage of the section circuit. In addition, a plurality of section circuits or a single section circuit can be connected by shutting off the stop valves at both ends of any section circuit, or connecting a multi-purpose port of upstream and downstream stop valves of a single section circuit. By configuring a bypass supply / discharge pipe that bypasses the section circuit, the hydraulic cylinder can be operated while repairing the plurality of section circuits or a single section circuit .

In the hydraulic circuit maintenance method of the present invention, a hydraulic drive device that drives an actuated device such as a sluice or an industrial machine, a hydraulic source that discharges hydraulic oil to drive the drive device , and the hydraulic source are connected an oil tank working oil to the drive device is fed back, with the drive device and the hydraulic source and the direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive system provided between the oil tank and supplying hydraulic fluid to said hydraulic pressure source is ejected by Yes operation of the direction switching valve provided between the oil tank and between the hydraulic drive system of the hydraulic source and the hydraulic drive system to the hydraulic drive system A plurality of supply and discharge pipes for returning the hydraulic oil from the hydraulic drive device to the oil tank, and a plurality of stop valves having an opening / closing function are provided in the supply and discharge pipes. Forming the circuit and said section circuit In a hydraulic circuit having a multi-purpose port that communicates, an operation that configures a hydraulic oil filling area by shutting off the uppermost stream side and the lowermost stream side of any continuous section circuit among the plurality of section circuits with a stop valve The hydraulic oil can be filled in the hydraulic oil filling section by holding the hydraulic fluid discharge hydraulic oil supplied to the upstream side of the hydraulic oil filling zone and the hydraulic oil filling zone configured in the hydraulic oil filling zone construction step. And a vacuum holding step of holding the hydraulic oil filling area in a vacuum by a multi-purpose port of a section circuit on the most downstream side of the hydraulic oil filling area constituted by the hydraulic oil filling area constituting step, and A filling section constituting step that constitutes a filling section that is configured by shutting off a supply / discharge pipe on the uppermost stream side of the hydraulic oil filling section that has been evacuated in a vacuum holding step, and a filling section that is constituted by the filling section constituting step. Upstream stop valve A hydraulic fluid filling step of communicating hydraulic fluid into a filling section in communication with each other, and a sequential hydraulic oil filling method for sequentially filling hydraulic fluid from an upstream side to a downstream side of the hydraulic oil filling zone It is characterized by that.

  In the maintenance method of the hydraulic circuit having the above-described sequential hydraulic oil filling method, a plurality of section circuits are used as the hydraulic oil filling area in the hydraulic circuit, and the entire hydraulic oil filling area is maintained in a vacuum state in the vacuum holding process. By configuring the filling section from the upstream side of the hydraulic oil filling area in the filling section configuration process, the hydraulic oil is sequentially filled from the upstream side of the hydraulic oil filling area, so that the hydraulic oil is filled in an extremely high vacuum state. It has the effect of reducing the amount of air in the hydraulic oil.

The hydraulic circuit maintenance method of the present invention includes a hydraulic drive device that drives an actuated device such as a sluice, an industrial machine, a hydraulic source that discharges hydraulic oil to drive the hydraulic drive device , and the hydraulic source includes an oil tank which returns hydraulic fluid connection to the hydraulic driving apparatus, the driving device and the hydraulic source and the direction switching for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive system provided between the oil tank a valve, a hydraulic fluid the hydraulic source is ejected by Yes operation of the direction switching valve provided between the oil tank and between the hydraulic drive system of the hydraulic source and the hydraulic drive system to the hydraulic drive system more to the supply and discharge line and the supply and exhaust pipe for supply and fed back hydraulic oil from the hydraulic drive system to the oil tank, is provided with a plurality of stop valve having a closing function to the supply and discharge line by the check valve And forming the interval circuit of In a hydraulic circuit having a multi-purpose port that communicates with an inter-circuit, a damage inspection area is configured by blocking the upstream and downstream stop valves of a plurality of continuous section circuits or a single section circuit. and damage examination zone configuration process, a pressure holding step holds to allow inspection before damage state corruption examination zone configured in about examination zone machining configuration pressurized, to maintain the pressure in the pressure holding step It is characterized by comprising a breakage detection step for detecting the presence or absence of breakage by measuring the degree of pressure drop within a breakage inspection area within a predetermined time, and a breakage portion detection step constituted further.

  According to the above method, the pressure holding step that configures the breakage inspection area in the breakage inspection area forming step in the supply and discharge pipe and holds the breakage inspection area in a pressurized state, and enables the inspection, and the pressure holding step Since there is a supply / exhaust pipe broken portion detection step that measures the pressure drop within a certain fixed time in the damage inspection area where the pressure is maintained, the damage inspection area is configured at any place of the supply / exhaust pipe 35. It is possible to recognize the damaged portion of the supply / exhaust pipe intensively, and the damaged portion can be identified quickly, so that repair and response to damage can be accelerated.

  According to the hydraulic circuit of the present invention, a separation section circuit can be formed by a plurality of stop valves for the supply / discharge pipe connecting the hydraulic cylinder, the hydraulic source, and the oil tank. In addition, because it is possible to inspect abnormalities, supply hydraulic fluid, and repairs for each section circuit, even if there is a suspicion of failure in the supply and exhaust pipes due to disasters such as earthquakes and aging, for example, in section circuit units Since it can be measured, it is easy to identify the damaged part. In addition, the supply of the hydraulic oil to the supply / discharge pipe is also made vacuum in section circuit units, so that the mixing of air into the hydraulic oil that is likely to occur when the hydraulic oil is supplied to the supply / discharge pipe can be minimized. . Furthermore, since the stop valve constituting the section circuit has a multi-purpose port, the multi-purpose port bypasses the section circuit to ensure the supply of hydraulic oil to the hydraulic cylinder, and supply and discharge without stopping the hydraulic cylinder. The pipe can be repaired.

It is a mimetic diagram showing the hydraulic circuit concerning the embodiment of the present invention. It is a figure which shows the structure of the stop valve which concerns on embodiment of this invention. It is a figure which shows the structure of the coupling which has the self-sealing function which comprises the multipurpose port in the stop valve which concerns on embodiment of this invention. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of air bleeding and oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of abnormality handling and a test | inspection. It is a figure which shows the structure of the stop valve which concerns on another embodiment of this invention. It is a figure which shows the structure of the stop valve which concerns on another embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The upstream side is a side to which hydraulic oil is supplied, and the downstream side is a side to which the hydraulic oil returns.

As shown in FIGS. 1 and 2, the hydraulic circuit 1 according to the present embodiment includes a hydraulic drive device 50 (hereinafter referred to as a hydraulic cylinder 50 ) that drives an operating device of a sluice or industrial machine, and a hydraulic cylinder 50. A hydraulic source 34 (hereinafter referred to as a pump 34) that discharges hydraulic oil for operating the pump, a direction switching valve 37 connected to the discharge side of the pump 34, a supply / discharge pipe 35 connecting the hydraulic cylinder 50, and a hydraulic cylinder 50, and a supply / discharge pipe 36 for returning the hydraulic oil of the hydraulic cylinder 50 to the oil tank 30 through the direction switching valve 37. The direction switching valve 37 supplies and discharges the hydraulic oil to the hydraulic cylinder 50. To control the direction of operation. The stop valve 10 provided in the supply / discharge pipe 35 and the supply / discharge pipe 36 divides the supply / discharge pipes 35, 36 into a plurality of sections to form a section circuit. Note that the interval circuit, indicated by subscript alphabet a section circuit Kyuhaikan 35 side to the code 21, shown by subscript A Alpha bed section circuit Kyuhaikan 36 side to the code 22.

Further, the hoses 35a and 36a constituting the section circuit 21c22c of the supply and discharge pipes 35 and 36 of the hydraulic circuit 1 according to the present embodiment absorb the deviation when the supply and discharge pipes 35 and 36 are shifted due to an earthquake or the like. It is provided to avoid damage to the exhaust pipes 35 and 36. A stop valve 10c and a stop valve 10d are provided at both ends of the hose 35a provided in the supply / discharge pipe 35. By closing the stop valve 10c and the stop valve 10d, the hose 35a can be replaced due to breakage or aging. I have to. The same applies to the hose 36a provided in the supply / exhaust pipe 36, and the description will be omitted if necessary.

  “Maintenance” refers to an abnormality inspection for inspecting an abnormality occurring in the hydraulic circuit 1 such as a disaster of the hydraulic circuit 1 or a failure of the supply and discharge pipes 35 and 36 due to aging at the time of a disaster such as an earthquake, and after completion of construction. It contains at least air venting and filling of hydraulic oil in the supply / exhaust pipe that fills the hydraulic circuit 1 with hydraulic oil or replaces dirty oil, and operates the supply / exhaust pipe, pump 34, and hydraulic cylinder 50 normally. It includes everything to make it happen.

  The supply pipes 35 and 36 are connected to a pump 34 that sucks and pressurizes the hydraulic oil in the oil tank 30 and discharges it as hydraulic oil, and a direction switching valve 37 connected to the oil tank 30. When operated by 37a, the supply / discharge pipes 35, 36 become a hydraulic oil supply circuit and discharge circuit, and when operated by the position 37c, the supply / discharge pipes 35, 36 become a hydraulic oil discharge circuit and supply circuit. Further, when operated to the position 37b, the supply / discharge pipes 35 and 36 are closed to hold the hydraulic cylinder 50 at the stop position.

The section circuit 21 defined by the plurality of stop valves 10 provided in the supply / discharge pipe 35 includes section circuits 21a to 21d configured by the stop valves 10a to 10e, a section configured by the stop valve 10e and the multi-function valve 60. And a circuit 21e. Similarly, the section circuit 22 partitioned by the plurality of stop valves 10 in the supply / discharge pipe 36 includes section circuits 22a to 22d configured by the stop valves 10k to 10f, and a section circuit 22e configured by the stop valve 10f and the multi-function valve 60. I have. The section circuits 21c and 22c may be described as hoses 35a and 36a for convenience of explanation. (Note that when a specific section circuit is displayed, the section circuits 21 and 22 are indicated by an alphabetic subscript, but otherwise, the section circuits 21 and 22 may be described.)

Check valve 10, as shown in FIG. 2 (a), includes a valve body 19 which abuts the valve seat 17 of Kyuhaikan 35 and 36 connected to valve the body 15, the valve element on the valve seat 17 Ports 18a and 18b are blocked by abutting 19 on. When the valve body 19 cuts off between the port 18b and the port 18b, the supply / discharge pipes 35 and 36 are cut off, so that arbitrary section circuits 21 and 22 are formed in the supply / discharge pipes 35 and 36. When the valve body 19 communicates with the port 18a and the port 18b, the supply / discharge pipes 35 and 36 constitute a supply / discharge pipe. ( Note that the communication of the stop valve 10 may be described as “open” and shut-off as “closed”. In addition, since the stop valve 10 is symmetrical, the left and right are identified by adding an alpha bed to the same numerical symbol. May be represented.)

Further, the one end portion in the lateral direction of the valve body 15 of the check valve 10 shown in FIG. 2 (a), the port 18a and the port 18 b is formed Kyuhaikan 35 (or Kyuhaikan 36) is connected ing. At the center of the valve main body 15, a flow path 16 that includes a valve seat 17 and communicates the port 18a and the port 18b is provided. The valve seat 17 of the channel 16, the same axis as the flow channel 16, the grip portion 11 is fixed, the valve body 19 up and down by rotating shaft 12 you move up and down is rotated with the grip portion 11 When the rotary shaft 12 is rotated and the valve body 19 is brought into contact with the valve seat 17, the port 18 a and the port 18 b are disconnected from each other. The rotary shaft 12 causes the valve body 19 to be connected to the valve seat 17. When separated from the port, the port 18a and the port 18b have a function of communicating with each other, and the multipurpose ports 13a and 13b communicated with the ports 18a and 18b are provided.

The multi-purpose port 13a is a structure fitted with a coupling 40a having Jifu function branch channel 1 4 a port 18a of the valve body 15. This self-sealing function of the joint 40a is configured to open only when the connection fitting main body 71 of the connection fitting 70 shown in FIG. 2B is connected. In a state where the fitting body 71 to the multi-purpose port 13a is not connected, it is protected by a cap 55 a. Similarly multipurpose port 13b is a structure fitted with a coupling 40b having a Jifu function branch channel 1 4 b port 18b of the valve body 15. The self-sealing function of the joint 40b is configured to open only when the connection fitting main body 71 of the connection fitting 70 is connected. It is protected by a cap 55 b in a state where the connection to the multi-purpose port 13a fitting body 71 is not connected. Since the joints 40a and 40b and the cap 55 have the same configuration as shown in FIG. 2B, when specifying the joint and the cap, an alpha bed is added to the numbers of the joint 40 and the cap 55. Although not shown, there may be cases where only numbers are used .

Joint 40 having a self-sealing function shown in FIG. 2 (b), its is attached to the branch flow path 1-4 of the valve body 15 by a screw 44 provided at the lower end of the body 43, the flow path 49 provided therein ball valve 42 (having a check valve self-sealing function.) to be pressed pressed by spring 41 in closing the flow path 49 communicating with the branch flow path 1-4. This is provided with the interior of the joint 40, the flow path 49 to be connected to the branch flow path 1-4, the rod 72 of the upper end is opened connection fitting 70 has a passage 48 to be inserted. In the joint 40, the ball valve 42 blocks the flow path 49 in a situation where the connection fitting 70 is not attached. Therefore, even if the stop valve 10 is installed in the supply / discharge pipe 35 or the supply / discharge pipe 36, the flow path 49 remains closed and oil is not discharged. The above-described ball valve 42 that plays the role of the self-sealing function is not particularly required to be the ball valve 42 and may be, for example, a cutoff valve. (Note that the joint 40, the connection fitting 70, and the cap 55 may be displayed with a letter added to the alphabet when it is necessary to identify left and right.)

A fitting portion 47 is provided on the outer periphery of the passage 48, and a screw 53 for attaching the cap 55 or the connection fitting 70 is provided in a manner connected to the lower portion of the fitting portion 47, and FIG. The cap 55 is attached to the screw 53 .

  A connection fitting 70 shown in FIG. 2B has a connection fitting main body 71 and an end body 78 to which a hose 75 fixed to the connection fitting main body 71 is fixed. It is provided inside the rod 72 provided in the metal fitting body 71 and is connected to a passage 76 opened to the chevron-shaped recess 77 at the tip thereof. When the tip of the rod 72 presses the ball valve 42 and opens it, the channel 49 is opened. It is the structure which communicates. Since the connection fitting main body 71 and the end body 78 are connected by a rotary joint 79, the hose 75 is not twisted even if the connection fitting main body 71 is rotated.

The inner hole 73 of the connection fitting main body 71 is provided with an inner screw 81 that is screwed into the screw 53 of the main body 43 and a rod 72 that is fitted into the passage 48 of the joint 40. which is a structure in which when threaded connection to the screw 53 of the body 43 the ball valve 42 is opened branch channel 1 4 is connected to a hose 75.

Connection fitting body 71 described above, a pressure gauge at the tip of the hose 75, the bypass circuit of the vacuum pump, fittings interval circuit connected to the multi-purpose port 13 of the joint 40 of the other check valve 10 to connect the main body For example, it can be used for various purposes by connecting devices corresponding to the purpose. 2 (a) shows an embodiment in which the multipurpose ports 13a and 13b are provided on both sides of the valve body 19 so as to communicate with the ports 18a and 18b. Either one is acceptable.

  The pump 34 shown in FIG. 1 whose suction side is connected to the oil tank 30 rotates when the two gears mesh with each other, sucks the oil contained in the oil tank 30, and is supplied and discharged by the direction switching valve 37. Discharge to 35 or 36. The pump 34 is not limited to a gear pump, and other types of pumps may be used.

  A hydraulic cylinder 50 for driving a driven device of a sluice or industrial machine is composed of a piston fitted into the cylinder body 52 so as to be slidable in the longitudinal direction and a rod 51 fixed to the biston. The piston forms a head side pressure chamber and a rod side pressure chamber in the cylinder body 52. When hydraulic oil is supplied to the head side pressure chamber, the rod 51 operates in the direction of arrow A. When hydraulic oil is supplied to the head side pressure chamber, the rod 51 operates in the direction of arrow B. Note that the arrow A direction may be described as expansion, and the arrow B direction may be described as reduction.

The multifunction valve 60 provided in the hydraulic cylinder 50 bypasses between the stop valves 62 and 63 that open and close between the supply / discharge pipes 35 and 36 and the hydraulic cylinder 50 and the supply / discharge pipes 35 and 36. When both of the stop valves 62 and 63 are shut off, the hydraulic cylinder 50 is held in that position, one of the stop valves 62 and 63 is closed, and hydraulic oil is started from the other. When the pressure is applied, the leakage of the shut off stop valve can be detected. Further, by connecting the stop valve 61, the bypass circuit is configured and the supply / exhaust pipes 35 and 36 can be flushed. Since these functions are described in detail in Japanese Patent No. 3696850 owned by the applicant, detailed description thereof will be omitted. Incidentally, the stop valve 62, 63 and check valve 61 of multifunctional valve 60 of the present invention is same as the configuration and check valve 10 has a closing function.

As shown in FIG. 1, the oil tank 30 and the direction switching valve 37 discharge side and the supply and discharge pipes 35, 36 of the pump 34 is connected is provided with three positions, the supply and exhaust pipe 35 to be operated in the position 37 b was connected to the discharge side of the pump 34, the hydraulic cylinder 50 is actuated in the arrow a direction so connecting Kyuhaikan 36 to the oil tank 30. When operated to the position 37c, the supply / discharge pipe 36 is connected to the discharge side of the pump 34, and the supply / discharge pipe 35 is connected to the oil tank 30, so that the hydraulic cylinder 50 operates in the B direction. Further, when the operation is performed to the position 37b, the discharge side of the supply / discharge pipe 35 and the pump 34 and the space between the supply / discharge pipe 36 and the oil tank 30 are closed, so that the hydraulic cylinder 50 is operated to three positions to keep the stop position. controlling the work movement of the hydraulic cylinder 50. That is, the rod 51 of the hydraulic cylinder 50 is operated in the A direction is operated in the position 37 b, the rod 51 of the hydraulic cylinder 50 is operated to position 37c is operated in the direction B, of the hydraulic cylinder 50 is operated to position 37 a rod 51 Stop at that position.

  Next, a maintenance method for the hydraulic circuit 1 according to the present embodiment will be described.

  In the hydraulic circuit in a state where the construction has been completed, the hydraulic oil is not supplied to the supply / discharge pipes 35 and 36 of the hydraulic circuit 1, and in this state, the hydraulic oil is sequentially filled while the air in the supply / discharge pipe is excluded. A maintenance method for a hydraulic circuit having a hydraulic fluid filling method will be described.

As shown in FIG. 3 (a), the sequential hydraulic oil filling method is first shortened when the plurality of section circuits 21a to 22a ( the section circuits represent the section circuits 21a to 21e and the section circuits 22a to 22). sometimes referred to as interval circuit 21a~22a Te.) most upstream stop valve 10a and the section open to all the other check valve 10 to close the stop valve 10k of the most downstream side circuit of the inner section circuits 21a~ 22a is configured as a hydraulic oil filling zone (a hydraulic oil filling zone configuration step). Then, while supplying the discharge hydraulic oil pump 34 on the upstream side of the upstream-side stop valve 10a of the hydraulic oil fill area constituted by the hydraulic fluid filled zone configuration process by operating the direction switching valve 37 to the position 37 b The hydraulic oil filling section can be filled with hydraulic oil (filled hydraulic oil holding step). Next, the air in the hydraulic oil filling area is sucked by the vacuum pump 20 in which the hydraulic oil filling area constituted by the section circuits 21a to 22a is connected to the multipurpose port 13b of the stop valve 10k of the downstream circuit section. Filling preparation for holding the hydraulic oil filling area in a vacuum is performed (vacuum holding step). In the filling Preparation described above may be interchanged The "filling hydraulic fluid holding step" in the process "vacuum holding process". Further, the “filling hydraulic oil holding step” and the “vacuum holding step” are continued until filling is completed.

  In the state where the preparation for filling is completed as described above, the filling of the working oil into the section circuit 21a which is the working oil filling section on the most upstream side of the working oil filling section will be described. As shown in FIG. 3 (b), after the stop valve 10b on the downstream side of the section circuit 21a is closed to form the filling section, when the stop valve 10a of the supply / discharge pipe 35 is opened, it reaches the upstream side of the stop valve 10a. The supplied hydraulic oil is supplied, and the filling of the hydraulic oil into the filling section constituted by the section circuit 21a is completed.

Next, as shown in FIG. 4A, a case where hydraulic fluid is filled into the section circuit 21b which is the next hydraulic oil filling section will be described. Since the filling hydraulic oil is held on the upstream side of the stop valve 10b, when the stop valve 10c on the downstream side of the section circuit 21b is closed and then the upstream stop valve 10b is opened, the filling of the section circuit 21b is completed.

  As shown in FIG. 4 (b), the case where the hydraulic circuit is filled in the section circuit 21c, which is the next hydraulic oil filling section, will be described. When the stop valve 10c is opened by closing the stop valve 10d on the downstream side of the section circuit 21c and setting the section circuit 21c as a filling section, the section circuit 21c is filled with hydraulic oil.

  As shown in FIG. 5 (a), the case where the hydraulic fluid is filled into the section circuit 21d, which is the next hydraulic fluid filling section, will be described. The filled hydraulic oil is held upstream of the stop valve 10d by the above-described filling. When the stop valve 10d is closed by closing the stop valve 10e on the downstream side of the section circuit 21d and using the section circuit 21d as a filling section, the section circuit 21d is filled with hydraulic oil.

As shown in FIG. 5B, the case where the hydraulic oil is filled into the section side circuit 21e, which is the next hydraulic oil filling section, and the head side hydraulic chamber of the hydraulic cylinder 50 will be described. Since filling the hydraulic oil on the upstream side of the check valve 10e is held by the filling of the bypass circuitry of the multi-function valve 60 by closing the stop valve 61 of multifunctional valve 60 is provided on the downstream side of the segment circuit 21e closed, after the charging area of the head-side pressure chamber of the section circuit 21d and the hydraulic cylinder 50 to open the stop valve 62 of multifunctional valve 60, the head-side pressure chamber of the section circuit 21e and the hydraulic cylinder 50 to open the stop valve 10e Is filled with hydraulic oil.

As shown in FIG. 6 (a), the section circuit 22e, which is the next hydraulic oil filling section, and the case where the hydraulic oil is charged into the rod side hydraulic chamber will be described. Since the filling hydraulic fluid is held on the upstream side of the stop valve 61 of the bypass circuit of the multi-function valve 60 by the above filling, the stop valve 10f on the downstream side of the section circuit 22e is closed and the stop valve 63 of the multi-function valve 60 is opened. When the trailing valve 10e is opened with the rod side pressure chamber of the hydraulic cylinder 50 as a filling section, the section circuit 21e and the rod side pressure chamber of the hydraulic cylinder 50 are filled with hydraulic oil.

As described above, after closing the stop valve on the downstream side of the section circuit next to the section circuit filled with hydraulic oil, the stop valve on the downstream side of the section circuit filled with hydraulic oil is opened to sequentially apply the hydraulic oil to the section circuit. As shown in FIG. 6 (b), the hydraulic oil filling section is configured as section circuits 21a to 22a, and the hydraulic oil is sequentially filled to finish the filling of the section circuit 22a. , The hydraulic oil in the section circuit 22a returns to the oil tank 30 via the direction switching valve 37, whereby the hydraulic oil 1 is completely charged as shown in FIG. 6B.

  According to the maintenance method for filling the hydraulic circuit 1 with hydraulic oil, the section circuit for filling the hydraulic oil is sequentially provided by a plurality of stop valves while the supply and discharge pipes 35 and 36 are always kept in vacuum by the vacuum pump 20. By progressing, when the hydraulic oil is filled, the mixing of air into the hydraulic oil can be greatly reduced.

In the above description, a method of filling a sequential firing oil interval circuit from the upstream side has been described, may be filled together a plurality of segment circuits. That is, as shown in FIG. 2A , after section circuits 21a to 22a, which are relatively simple passages, are configured as hydraulic oil filling sections, section circuits 21a to 21d are configured as hydraulic oil filling sections, and section circuit 21a. When the stop valve 10a on the upstream side is opened, hydraulic fluid can be supplied to the section circuits 21a to 21d .

Next, a security circuit having a damaged portion detection method will be described.
As shown in FIG. 7 (a), a method for detecting a damaged portion when a failure occurs in the supply pipe 35 in the hydraulic circuit 1 will be described. Such a failure part is caused by a disaster such as an earthquake or aging. In this case, the hydraulic oil flowing through the supply pipe 35 flows out from the failed part, and malfunction of the hydraulic cylinder 50 (output shortage, operation stop, stop position retention defect, etc.) occurs. Therefore, it is indispensable to quickly grasp and repair which part has failed. Therefore, in the case of the maintenance method according to the present embodiment, as shown in FIG. 7B, first, all the stop valves 10 are shut off to constitute a damage inspection area. Next, the direction switching valve 37 is operated to the position 37a to supply hydraulic oil discharged from the pump 34 to the upstream side of the section circuit 21a (upstream side of the stop valve 10a).

Next, as shown in FIG. 8 (a), and Gu between circuits 21a damage inspection zone only upstream of the check valve 10a in damage examination zone configuration step of communicating sections circuit 21a, the position of the direction switching valve 37 37 pump 34 by operating the b holds the pressure in the pressure holding step Ru allowed to act on the section circuit 21a the hydraulic oil discharged. Next, immediately after shutting off the stop valve 10a, the pressure gauge 45 provided at the multipurpose port 13b of the stop valve 10a is used to measure whether or not the pressure drop after a certain time exceeds a certain drop value. The presence or absence of damage is detected in the damage detection process.

Next, as shown in FIG. 8 (b), and interval circuit 21a, the upstream side of the check valve 10a of 21b, 10b damage inspection zone configuration process in wards between circuits 21a communicating, and 21b damage examination zone, direction switch maintaining the pressure in the pressure holding step Ru reacted with hydraulic oil pump 34 is discharged by operating the valve 37 to the position 37 b interval circuit 21a, to 21b. Next, immediately after shutting off the stop valve 10a, the pressure gauge 45 provided at the multipurpose port 13b of the stop valve 10a is used to measure whether or not the pressure drop after a certain time exceeds a certain drop value. The presence or absence of damage is detected in the damage detection process. The pressure gauge 45 may be installed in the pressure gauge 45 installed in the multipurpose port 13a of the stop valve 10c.

Next, as shown in FIG. 9 (a), a ward between circuits 21 a - 21 c corrupt examination zone corruption examination zone configuration process for communicating the valve 10a~10c upstream interval circuit 21 a - 21 c, the direction switching pump 34 by operating the valve 37 to the position 37 b to hold the pressure in the pressure holding step Ru reacted with hydraulic oil in the interval circuit 21a~21c for discharging. Next, immediately after shutting off the stop valve 10a, the pressure gauge 45 provided at the multipurpose port 13b of the stop valve 10a is used to measure whether or not the pressure drop after a certain time exceeds a certain drop value. The presence or absence of damage is detected in the damage detection process. The pressure gauge 45 may be installed in the pressure gauge 45 installed in the multipurpose port 13a of the stop valve 10c.

Next, as shown in FIG. 9 (b), the wards between circuits 21a to 21d and the damage inspection zone with damaged examination zone configuration process for communicating the valve 10a~10d upstream interval circuit 21a to 21d, the direction switching maintaining the pressure in the pressure holding step Ru reacted with hydraulic oil in the interval circuit 21a~21d for discharging of the pump 34 by operating the valve 37 to the position 37 b. Next, immediately after shutting off the stop valve 10a, the pressure gauge 45 provided at the multipurpose port 13b of the stop valve 10a is used to measure whether or not the pressure drop after a certain time exceeds a certain drop value. The presence or absence of damage is detected in the damage detection process . If the pressure drop across the segment circuit 21a~21d in this breakage detection process is to be broken will be more than a certain value, because section circuit 21a~21c as out above is not corrupted, damaged section 80 there is found to be present in the district between the circuit 21.

  According to the above-described damaged portion detection step, the supply / discharge pipes 35 and 36 that connect the direction switching valve 37 and the hydraulic cylinder 50 are formed into section circuits by the plurality of stop valves 10. Then, hydraulic oil discharged from the pump 34 is sequentially supplied and sealed for each section formed by the plurality of stop valves 10, and the inside of the supply and discharge pipes 35 and 36 is provided by a pressure gauge 45 provided in the multipurpose port 13 a of the stop valve 10. By sequentially measuring the pressure change, it is possible to inspect abnormalities occurring in each section. In other words, when the pressure drop measured by the pressure gauge 45 is within a certain range, there is no abnormality in the section. On the other hand, when the pressure drop measured by the pressure gauge 45 is larger than the certain range, within the section. It can be seen that an abnormality has occurred. In this way, since it is possible to inspect the abnormality for each short section, it is not necessary to inspect the entire supply / exhaust pipe damaged by the disaster such as an earthquake or aging, for example. Save time and effort.

Having described an embodiment of a method for measuring sequentially the damaged districts between circuits or, if you wish to measure with priority a specific interval circuit when it such a possibility that breakage occurs is large can be assumed, for example, If priority is given to checking interval circuit 21d is the damage inspection zone configuration step of interrupting the downstream stop valve 10e, and the ward between circuit 21a~21d damage inspection zone, operating the direction switching valve 37 to the position 37 b maintaining the pressure in the pressure holding step pump 34 fills the hydraulic oil discharged to the interval circuit 21a~21d by. Next, immediately after shutting off the stop valve 10d, the pressure gauge 45 provided in the multipurpose port 13a of the stop valve 10e measures whether or not the pressure drop over a certain period of time exceeds a certain drop value. detecting the presence or absence of breakage in breakage detection process, according to this method the district between circuits 21d to can be preferentially inspected.

Besides the above description, blocking any upstream of valve 10c and the downstream side of the check valve 10e for consecutive intervals circuits (e.g., segment circuits 21c and Gu between circuits 21d) of Kyuhaikan 35,36 corruption in the examination zone configuration process, the wards between circuit 21d and the wards between circuits 21c and damage examination zone, the pressure exerting pressure from another hydraulic source to the pump 34, such as some time ago hydraulic source multipurpose port 13b of the check valve 10c Breakage that can be inspected by the holding process, and that breaks when the pressure drop in the stop valve 10 on the downstream side of the breakage inspection area that has become possible to be inspected within a certain time is measured and the value of this drop reaches a certain value. There is a method of detecting breakage in the detection process. Incidentally, in this method, a plurality of wards between circuit 21 and a broken examination zone, may be damaged examination area wards between the circuits 21 of the singular.

  As described above, when repairing a case where the section circuit 21d of the hydraulic circuit 1 is damaged, the multipurpose port 13a on the upstream side of the stop valve 10d and the multipurpose port 13b on the downstream side of the stop valve 10e are connected. Thus, a circuit that bypasses the section circuit 21d can be configured. Therefore, since the hydraulic oil can be supplied to the hydraulic cylinder 50 via the bypass circuit 81, the hydraulic cylinder 50 can be repaired while ensuring the operation of the hydraulic cylinder 50. In addition, the multi-purpose port 13b of the stop valve 10 is configured to be provided on both sides. However, as a configuration in which two multi-purpose ports 13b are provided, if a pressure gauge is installed on one side and a general hydraulic pressure source is connected to the other, Pressure measurement is possible.

Multipurpose port 13a of the check valve 10 is placed in a pressure gauge 45 for measuring the pressure drop in the ward between circuits, the installation of some time ago hydraulic source for applying a pressure to the ward between circuit, bypass circuit that bypasses the ward between circuits its installation, and when repairing a ward between the circuits are those installation of devices for releasing the pressure sealed wards between circuits is installed in such as check valve 10 constitute a ward between circuits Subdivision between circuit partially inspected, and includes the effects that may connect devices required to perform repairs.

For example, as shown in FIG. 10A, a stop valve 100 according to another embodiment of the present invention is a ball valve type stop valve. Specifically, the stop valve 100 includes a convex valve body 115 as a main body , a rotating shaft 112 inserted from above the valve body 115, and a pair of pressure detection ports 40 provided at both ends of the valve body 115, respectively. And.

A port 118a through which oil flows is formed at one end in the left-right direction of the valve body 115, and a port 118b through which oil flows out is formed at the other end. A ball valve 119 in which a passage 116 is formed is provided in the center of the valve body 115. A lower end portion of the rotating shaft 112 is connected to a ball valve 119, and a long grip portion 111 is fixedly installed on the upper end portion of the rotating shaft 112 by a nut 113. Then, as the gripper 111 rotates in the left-right direction, the rotary shaft 112 and the ball valve 119 also rotate, and the passage 116 opens or blocks between the port 118a and the port 118b.

  In the stop valve 100 having the above-described configuration, when the grip portion 111 is manually rotated clockwise by the operator, the ball valve 119 is rotated clockwise together with the rotation shaft 112, and the port 118a and the port 118b are , The passage 116 intersects at an angle of 90 degrees. Thereby, between the inflow port 118a and the port 118b is interrupted | blocked. On the other hand, when the gripper 111 is manually rotated counterclockwise by the operator, the ball valve 119 is rotated in the left direction together with the rotating shaft 112, and the port 118a and the port 118b are communicated with the passage 116. Thereby, the space between the port 118a and the port 118b is opened. The multipurpose port joint 40 is the same as that shown in FIG.

As shown in FIG. 10B, a stop valve 150 according to another embodiment of the present invention is a ball valve type and is a stop valve controlled from the outside by driving of a motor 151. Specifically, the stop valve 150 includes a convex valve body 165 as a main body and a pair of multipurpose ports 13a and 13b provided at both ends of the valve body 165, respectively.

In addition, a U-shaped case 161 fixedly installed by a support portion 164 is fitted into the upper portion of the convex valve body 165, and a hole is formed at the center of the upper surface of the case 161. . Furthermore, a motor 151 that is driven by a remote operation from the outside is provided on the upper surface of the case 161, and a rotating shaft 153 of the motor 151 is inserted through the formed hole. The motor 151 is previously sealed with oil. Therefore, even when the hydraulic circuit 1 is used for a water gate or the like and the motor 151 is immersed in water, water does not enter the motor 151 and can be driven normally.

  The rotation shaft 153 of the motor 151 is connected to the shaft 152 via the connection release unit 162, and the rotation shaft 153 is rotated by the driving of the motor 151, and the shaft 152 is also rotated. In addition, the connection cancellation | release part 162 can cancel | release the connection part of the rotating shaft 153 and the axis | shaft 152 using tools, such as a spanner. For this reason, when there is an abnormality in the motor 151, the connecting portion between the rotating shaft 153 and the shaft 152 is released, and the shaft 152 can be manually rotated. The shaft 152 is urged by a spring 154, and a cylindrical cover 163 is covered on the outer periphery of the connecting portion between the rotating shaft 153 and the shaft 152.

A port 118a is formed at one end of the valve body 165 in the left-right direction, and a port 118b is formed at the other end. A ball valve 159 in which a passage 156 is formed is provided inside the center of the valve main body 165, and a lower end portion of the shaft 152 is connected to the ball valve 159. When the motor 151 is rotated in the left-right direction by remote operation, the rotating shaft 153, the shaft 152, and the ball valve 159 are rotated in the left-right direction. By these rotations, the passage 156 opens or blocks between the port 118a and the port 118b.

  In the stop valve 150 having the above-described configuration, when the rotation shaft 153 and the shaft 152 are rotated by driving the motor 151, the ball valve 159 rotates together with the shaft 152, and the port 118a and the port 118b and the passage 156 are connected. It intersects at an angle of 90 degrees. Thereby, the port 118a and the port 118b are blocked. On the other hand, the rotating shaft 153 and the shaft 152 are rotated by driving the motor 151, whereby the ball valve 159 is rotated together with the shaft 152, and the port 158a and the port 158b and the passage 156 are communicated. Thereby, communication between the port 118a and the port 118b is established. The joint 40 of the multipurpose port 13 is the same as that shown in FIG.

  The embodiments of the present invention have been described above, but only specific examples have been illustrated, and the present invention is not particularly limited. Specific configurations and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the present invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to things.

  INDUSTRIAL APPLICABILITY The present invention can be used for hydraulic circuits used in sluice drive devices, construction machinery, industrial machinery, and the like.

DESCRIPTION OF SYMBOLS 1 Hydraulic circuit 10a-10k Stop valve 21a-21e Section circuit 22a-22e Section circuit 30 Oil tank 34 Pump 35 Supply / discharge pipe 35a Hose 36 Supply / discharge pipe 36a Hose 37 Direction switching valve 37a Position 37b Position 37c Position 50 Hydraulic drive unit ( Hydraulic cylinder )
51 Rod 52 Cylinder body 60 Multifunctional valve 61 Stop valve 62 Stop valve 63 Stop valve

Claims (6)

A hydraulic drive that drives actuated devices such as sluices and industrial machinery;
A hydraulic source that discharges hydraulic oil to drive the hydraulic drive ;
An oil tank to which the hydraulic source is connected and hydraulic oil of the hydraulic drive device returns;
A direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive apparatus provided between said hydraulic pressure source and an oil tank and the hydraulic drive system,
The oil tank hydraulic oil from the supply hydraulic fluid the hydraulic source is discharged to the hydraulic drive system wherein the hydraulic drive system by Yes operation of the direction switching valve provided between the hydraulic drive device and the direction switching valve Supply and discharge pipes to be returned to
In the hydraulic circuit of the configuration with
A plurality of interval circuit more the supply and discharge line to the supply and discharge line is provided with a plurality of the supply and discharge line check valve having a function for opening and closing the,
A multi-purpose port for installing a pressure gauge or the like in the plurality of section circuits;
Hydraulic circuit, characterized in that the provided.   2. The hydraulic circuit according to claim 1, wherein at least one of the section circuits of the supply / discharge pipe is configured by stop valves provided at both ends of a hose interposed in the middle.   The hydraulic circuit according to claim 1, wherein the multipurpose port and the stop valve are integrally formed. A hydraulic drive that drives actuated devices such as sluices and industrial machinery;
A hydraulic pressure source for discharging hydraulic oil for driving the hydraulic drive device ;
A hydraulic tank to which the hydraulic source is connected and hydraulic oil of the hydraulic drive device returns;
A direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive system provided between said hydraulic drive device and the hydraulic pressure source and an oil tank,
Supplying a hydraulic fluid the hydraulic source is ejected by Yes operation of the direction switching valve provided between the hydraulic drive device and the direction switching valve to the hydraulic drive system, the oil hydraulic oil from the hydraulic drive system A supply and discharge pipe returning to the tank;
In a hydraulic circuit comprising
A stop valve having a valve body connected to the supply and discharge pipe of the hydraulic circuit,
A port provided in the valve body and connected to a supply / exhaust pipe;
A valve body that is slidably provided on the valve body and opens and closes between the ports;
A rotating shaft that is provided in the valve body and operates to open and close the valve body between ports;
A multi-purpose port provided with a joint having a self-sealing function provided in a flow path connected to the port;
The stop valve used for the hydraulic circuit characterized by comprising. Sluices, a hydraulic drive device for driving the actuating device, such as industrial machinery, a hydraulic source that discharges hydraulic oil for driving the driving device, an oil tank the hydraulic oil fed back to the hydraulic source is connected the drive unit When the direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes the hydraulic drive apparatus provided between said hydraulic pressure source and an oil tank and the drive device, between the hydraulic drive device and the hydraulic pressure source and the oil tank hydraulic oil from the supply hydraulic fluid the hydraulic source is discharged to the hydraulic drive system wherein the hydraulic drive system by Yes operation of the direction switching valve provided between the oil tank and the hydraulic drive system A plurality of stop valves having an opening / closing function provided in the supply / exhaust pipe, thereby forming a plurality of section circuits in the supply / discharge pipe and communicating with the section circuits. With a port In the voltage divider,
A hydraulic oil filling zone configuration step of configuring a hydraulic oil filling zone by shutting off a most upstream side and a downstream side of any continuous zone circuit of the plurality of zone circuits with a stop valve;
Filling hydraulic oil holding step for holding the hydraulic oil discharge hydraulic fluid supplied to the upstream side of the hydraulic oil filling zone configured in the hydraulic oil filling zone configuration step and filling the hydraulic oil filling zone with hydraulic oil When,
A vacuum holding step of holding the hydraulic oil filling area in a vacuum by the multipurpose port of the section circuit on the most downstream side of the hydraulic oil filling area configured in the hydraulic oil filling area configuration step;
A filling section constituting step that constitutes a filling section that is configured by blocking a supply / exhaust pipe on the most upstream side of the hydraulic oil filling section that has been evacuated in the vacuum holding step;
A hydraulic oil filling step of filling the filling section with hydraulic oil by communicating with a stop valve on the most upstream side of the filling section configured in the filling section configuration step;
A hydraulic circuit maintenance method comprising a sequential hydraulic oil filling method in which hydraulic oil is sequentially filled into a filling section from an upstream side to a downstream side of a hydraulic oil filling section. A hydraulic drive device that drives an actuated device such as a sluice, an industrial machine, a hydraulic source that discharges hydraulic oil to drive the hydraulic drive device , and the hydraulic source is connected to return the hydraulic oil of the hydraulic drive device an oil tank, a direction switching valve for controlling the supply and discharge direction of the hydraulic oil to be Yes hydraulic drive provided between the hydraulic pressure source and an oil tank and the driving device, with the hydraulic source and the hydraulic drive system the oil hydraulic oil from the supply hydraulic fluid the hydraulic source is discharged to the hydraulic drive system wherein the hydraulic drive system by Yes operation of the direction switching valve provided between and between the oil tank and the hydraulic drive system A plurality of supply / exhaust pipes returning to the tank and a plurality of stop valves having an opening / closing function are provided on the supply / exhaust pipes, and a plurality of section circuits are formed in the supply / discharge pipes by the stop valves and communicated with the section circuits. Multipurpose port In the hydraulic circuit,
A breakage inspection area configuration step of forming a breakage inspection area by shutting off the upstream and downstream stop valves of the plurality of continuous section circuits or a single section circuit;
A pressure holding step to allow inspection and maintained in a state where the breakage checking zone configured pressurized with enough before damage examination zone Engineering structure,
A breakage detection step of detecting the presence or absence of breakage by measuring the degree to which the pressure in the breakage inspection area holding the pressure in the pressurizing pressure hold step drops within a predetermined time; and
A maintenance method for a hydraulic circuit, comprising a broken part detecting step constituted by the above.

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