JP5619047B2 - Hydraulic circuit filling method for hydraulic circuit - Google Patents

Description

The present invention relates to a method of filling hydraulic fluid in a hydraulic circuit of a hydraulic drive device (hereinafter sometimes referred to as a hydraulic cylinder) such as a hydraulic cylinder and a hydraulic motor for driving a sluice, a construction machine, an industrial machine, and the like.

Conventionally, by opening and closing the stop valve provided in the middle of the supply and discharge pipes connected to the hydraulic cylinder, an air disconnect or hydraulic Filling be that the hydraulic circuit of the drive and the supply and exhaust pipes of the cylinder and the cylinder Is known.

  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. While connecting via a 1 poppet valve, the other port and a drain circuit are connected via a 2nd 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 the supply / exhaust pipe is suspected of being damaged 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 can be buried pipes depending on the location. 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. Further, in order to prevent the occurrence of cavitation due to the air mixed in the hydraulic oil returned to the oil tank, it is necessary to remove the air from the returned hydraulic oil, and there is a problem that it takes time and effort.

The present invention has been made in view of the above problems, by separating the feed and discharge pipes into a plurality of sections circuits, Hama after holding the separated section circuit vacuum, a pressurized hydraulic fluid charge by be Rukoto, and an object thereof is to provide a hydraulic fluid filling method of a hydraulic circuit, not contaminated air.

The method of working oil filling the first hydraulic circuit includes a hydraulic drive system for driving floodgates, to be operated device, such as industrial machinery, and the supply and exhaust pipe for supplying and discharging hydraulic oil to the hydraulic drive system, wherein closing the supply and discharge tube stop with a Yes-off function provided plurality in valve, the interval circuit formed by the check valve, and more constructed, the stop valve on the upstream side of the check valve and the downstream side of the section circuit a hydraulic oil fill area configuration step to configure the operating oil fill area with a valve, a vacuum holding step of holding the pre SL consists of hydraulic oil fill area configuration process hydraulic fluid filled zone in vacuum, prior to SL vacuum holding step a hydraulic oil filling step of filling the hydraulic fluid pressurized in the hydraulic fluid filling Ward area held by the vacuum in, characterized by comprising more.

According to the hydraulic circuit filling method of the hydraulic circuit of the present invention , the section circuit is configured by a plurality of stop valves provided in the supply and discharge pipes constituting the hydraulic circuit, and after the section circuit is held in vacuum, the hydraulic oil is added. Since the pressure is supplied in a normal state, the hydraulic oil filled in the supply / discharge pipe constituting the hydraulic circuit can surely remove air. In addition, a plurality of section circuits are formed in the supply and discharge pipes constituting the hydraulic circuit, and the process of filling the vacuum holding and pressurized hydraulic oil from the section circuits on the upstream side is sequentially repeated, so that even a long supply and discharge pipe The air of the filled hydraulic oil can be reliably removed .

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 hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic oil filling. It is a schematic diagram which shows the hydraulic circuit which concerns on embodiment of this invention at the time of hydraulic 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 FIG. 1 and FIG. 2 (a) and FIG. 2 (b) , a hydraulic circuit 1 according to this 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. wherein to. a), is described as a hydraulic source 34 (hereinafter pump 34 for discharging the hydraulic oil for operating the hydraulic cylinder 50. and), the direction changeover valve 37 and the hydraulic cylinder 50 connected to the discharge side of the pump 34 a paper discharge pipe 35 to be connected, the supply and discharge pipe 36 for feeding back from the direction changeover valve 37 the hydraulic oil of the hydraulic cylinder 50 connected to the hydraulic cylinder 50 to the oil tank 30, a configuration in which a. The direction changeover valve 37 of the hydraulic circuit 1 controls the operation direction by operating the supply and discharge direction of the hydraulic fluid to the hydraulic cylinder 50. 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. In this section circuit, the section circuit on the supply / exhaust pipe 35 side is indicated by reference numeral 21 with an alpha bed attached, and the section circuit on the supply / exhaust pipe 36 side is indicated by reference numeral 22 with an alpha bed attached.

Further, the hoses 35a and 36a constituting the section circuits 21c and 22c of the supply and discharge pipes 35 and 36 of the hydraulic circuit 1 according to the present embodiment are arranged so that the displacement of the ground when the supply and discharge pipes 35 and 36 are shifted due to an earthquake or the like. It is provided to absorb and avoid breakage of the supply / discharge 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 damage to the supply and discharge pipes 35 and 36 due to aging in the event of a disaster such as an earthquake. 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.

Supply and discharge pipes 35 and 36 is connected in the direction changeover valve 37 connected to a pump 34 and an oil tank 30 for discharging the hydraulic oil in the oil tank 30 as a suction and pressurized hydraulic fluid, the direction changeover valve When 37 is operated to the position 37b, Kyuhaikan 35 and 36 become discharge circuit and the supply circuit of the hydraulic oil, and is operated to the position 37c supply and discharge pipes 36 and 35 is a discharge circuit of the hydraulic oil supply circuit Become. Furthermore, that Tozasu closed feed and discharge pipe 35, 36 to be operated in the position 37a.

  The section circuit 21 defined by the plurality of stop valves 10 provided in the supply / exhaust 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.)

As shown in FIG. 2A, the stop valve 10 includes a valve body 19 that is connected to the supply / discharge pipes 35 and 36 and contacts the valve seat 17 in the valve body 15. Is shut off between the port 18a and the port 18b. When the valve body 19 shuts off between the port 18a and the port 18b, the supply / exhaust pipes 35 and 36 are shut off, so that arbitrary section circuits 21 and 22 are formed in the supply / exhaust 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. (In some cases, describing the opening of the stop valve 10 a shut-off "valve open" and "closed valve". Also, the same numeral designations in the case such check valve 10 is to identify the left and right because it is left-right symmetric (It may be shown with an alpha bed.)

  Further, a port 18a and a port 18b to which the supply / exhaust pipe 35 (or supply / exhaust pipe 36) is connected are formed at one end in the left-right direction of the valve body 15 of the stop valve 10 shown in FIG. Yes. 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 this flow path 16 is on the same axis as the flow path 16, and a gripping part 11 is fixed, and when rotated by this gripping part 11, a valve element 19 that moves up and down by a rotary shaft 12 that moves up and down is applied. 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, and the rotary shaft 12 separates the valve body 19 from the valve seat 17. The port 18a and the port 18b communicate with each other, and the multipurpose ports 13a and 13b communicate with the ports 18a and 18b.

  The multipurpose port 13a has a structure in which a joint 40a having a self-sealing function is attached to the branch flow path 14a of the 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 connection fitting main body 71 is not connected to the multipurpose port 13a, the multipurpose port 13a is protected by the cap 55a. Similarly, the multipurpose port 13b has a structure in which a joint 40b having a self-sealing function is attached to the branch flow path 14b of the 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. When the connection fitting main body 71 is not connected to the multipurpose port 13a, the multipurpose port 13a is protected by the cap 55b. 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.

  A joint 40 having a self-sealing function shown in FIG. 2B is attached to the branch flow path 14 of the valve main body 15 with a screw 44 provided at the lower end of the main body 43, and a spring 49 is attached to the flow path 49 provided therein. A flow path 49 communicating with the branch flow path 14 is closed by a ball valve 42 (a check valve having a self-sealing function) pressed by 41. The flow path 49 provided inside the joint 40 and connected to the branch flow path 14 has a passage 48 in which the upper end is opened and the rod 72 of the connection fitting 70 is 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. Is connected to the screw 53 of the main body 43 and the ball valve 42 is opened, and the branch flow path 14 is connected to the hose 75.

  The connecting fitting main body 71 described above is connected to the multipurpose port 13 of the joint 40 of the other stop valve 10 by connecting a pressure gauge, a vacuum pump, and a connecting fitting main body to the tip of the hose 75 to make a bypass circuit of the section circuit. For example, it can be used for a variety of purposes by connecting devices that meet that 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. However, any of the multipurpose ports 13a and 13b may be used as necessary. Either one is acceptable.

Is shown in Figure 1, a pump 34 whose suction side to the oil tank 30 is connected is rotated by the two gears meshing, sucks the oil stored in the oil tank 30, supply and discharge by the directional changeover valve 37 Discharge to tube 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 opening the stop valve 61, the bypass circuit is configured and the supply / discharge 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 has the same configuration as the check valve 10.

As shown in FIG. 1, the direction changeover valve 37 the discharge side and the supply and discharge pipes 35, 36 of the oil tank 30 and the pump 34 is connected is provided with three positions 37a, 37b, a 36c. By operating the directional control valve 37 to the position 37b, Kyuhaikan 35 is connected to the discharge side of the pump 34, Runode connected to Kyuhaikan 36 to the oil tank 30, the hydraulic cylinder 50 is actuated in the arrow A direction. Moreover, by operating the directional control valve 37 to position 37c, Kyuhaikan 36 is connected to the discharge side of the pump 34, the hydraulic cylinder 50 is operated in the direction B because Kyuhaikan 35 Ru is connected to the oil tank 30. Further, the discharge side of the manipulating directional control valve 37 to the position 37a and the supply and exhaust pipe 35 pump 34, and since between the supply and discharge pipe 36 and the oil tank 30 is closed, the hydraulic cylinder 50 that stops. That is, the rod 51 of the hydraulic cylinder 50 operates in the A direction when operated to the position 37b, the rod 51 of the hydraulic cylinder 50 operates in the B direction when operated to the position 37c, and the rod 51 of the hydraulic cylinder 50 operates when operated to the position 37a. Stop at position.

Next, a hydraulic fluid filling method for filling hydraulic fluid into the supply / discharge pipes 35 and 36 of the hydraulic circuit 1 according to the present embodiment will be described.

In the hydraulic circuit in a state where the piping work 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 filled while excluding air in the supply / discharge pipe. It describes charge Hamakata method.

The method of filling this work aggressive media, as shown in FIG. 3 (a), first, the plurality of sections circuits 21A～22a (Note that interval circuit, when it represents an interval circuit 21a~21e and interval circuit 22a~22e sometimes described as for short interval circuit 21a~22a in.) of the inner section the most upstream side stop valve 10a and the downstream side of the check valve 10k was closed valve all other stop valves 10 to open valve circuit Then, the section circuits 21a to 22a are configured as a hydraulic oil filling area (a hydraulic oil filling area configuration step). Then, supplying the discharged 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 changeover valve 37 to the position 37b, holding the hydraulic oil in a state in which the pressure to be filled with hydraulic fluid to the hydraulic fluid filled compartment (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. hydraulic oil fill area that holds a vacuum (vacuum holding steps). It may be interchanged in Cheng Hao described above as "filling the hydraulic oil holding step" and "vacuum holding process".

When the “filling hydraulic oil holding process” and the “vacuum holding process” described above are completed and the preparation for filling is completed, the hydraulic oil is supplied to the section circuit 21a which is the uppermost hydraulic oil filling section of the hydraulic oil filling section. Read about filling. As shown in FIG. 3B, after the stop valve 10b on the downstream side of the section circuit 21a is closed and the filling section is configured, when the stop valve 10a of the supply / discharge pipe 35 is opened, the upstream side of the stop valve 10a is reached. The hydraulic oil which has been filled is filled in a pressurized state, and the filling of the hydraulic oil into the filling section configured by the section circuit 21a is completed.

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

As shown in FIG. 4 (b), the case where hydraulic fluid is filled into the section circuit 21c, which is the next hydraulic fluid filling zone, will be described. By the above filling, the hydraulic fluid is pressurized and held on the upstream side of the stop valve 10c. Runode, after the closing section circuit 21c to the downstream side of the check valve 10d of the section circuit 21c was charging area, hydraulic oil is filled in the interval circuit 21c to open the stop valve 10c.

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 zone, will be described. By the above filling, the hydraulic fluid is pressurized and held on the upstream side of the stop valve 10d. Therefore, if the stop valve 10d on the downstream side of the section circuit 21d is closed and the rear stop valve 10d is opened with the section circuit 21d as a filling section, the section circuit 21d is filled with hydraulic oil.

As shown in FIG. 5 (b), a section circuit 21e, which is the next hydraulic oil filling section, and the case where the hydraulic oil is filled into the head side hydraulic chamber of the hydraulic cylinder 50 will be described. The above filling is performed on the upstream side of the stop valve 10e. Since the hydraulic fluid is pressurized and held, the bypass circuit of the multifunction valve 60 is closed by closing the stop valve 61 of the multifunction valve 60 provided on the downstream side of the section circuit 21e, and the stop valve 62 of the multifunction valve 60 is closed. After opening the section circuit 21d and the head side pressure chamber of the hydraulic cylinder 50 as a filling section, when the stop valve 10e is opened, the section circuit 21e and the head side pressure chamber of the hydraulic cylinder 50 are 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 of filling the rod side hydraulic chamber with hydraulic oil will be described . filling the hydraulic oil on the upstream side is held under pressure Tei Runode, a charging area of the rod-side pressure chamber of the hydraulic cylinder 50 to open the stop valve 63 of the closed downstream side of the check valve 10f multifunction valve 60 of section circuit 22e After that, when the stop valve 61 of the multi-function valve 60 is opened, the section circuit 2 2 e 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. 6B, 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. When to open the filling of the hydraulic fluid to the hydraulic circuit 1 as shown in FIG. 6 (b) by hydraulic oil in the interval circuit 22a is fed back to the oil tank 30 via the directional changeover valve 37 is completed To do.

According to the hydraulic oil charge Hamakata method described above to the hydraulic circuit 1, while keeping the Kyuhaikan within 35 and 36 always vacuum by a vacuum pump 20, a section circuit multiple of filling the pressurized hydraulic fluid by sequentially filled with check valve, the mixing of air into the hydraulic oil can no Kusuru when filling the hydraulic oil.

In the above description, the method of sequentially filling the section circuit from the upstream side with the hydraulic oil has been described. However, a plurality of section circuits may be filled together, that is, as shown in FIG. After the section circuits 21a to 22a, which are relatively simple passages, are configured as the hydraulic oil filling section, the section circuits 21a to 21d are configured as the hydraulic oil filling section and the stop valve 10a on the upstream side of the section circuit 21a is opened. And hydraulic fluid can be supplied to the section circuits 21a-21d. Further, the method of filling a plurality of section circuits together has been described. However, the method can be used for a method of filling only one section circuit with hydraulic oil, that is, as described above, a plurality of section circuits are collected. The method of supplying and filling pressurized hydraulic fluid from the upstream side is also based on the method of supplying pressurized hydraulic fluid to a single section circuit, and the filling method is the same. is there.

Next, we describe the damaged part detection how.
As shown in FIG. 7 (a), will be described damaged portion detecting method when damaged portion on the sheet discharge tube 35 in the hydraulic circuit 1 has occurred. Such a damaged part is caused by a disaster such as an earthquake or aging. In this case, the hydraulic oil flowing in the supply and exhaust pipe 35, flows out from the damaged portion to the outside, malfunction of the hydraulic cylinder 50 (output shortage, deactivation, the stop position holding failure and the like) is generated. Therefore, it is indispensable to immediately grasp and repair which part is damaged . Therefore, in the case of the damaged portion detection method according to the present embodiment, first, as shown in FIG. 7 (b), all the stop valves 10 are shut off to constitute a damage inspection area. Then supplies the hydraulic oil discharged in the pump 34 on the upstream side of the section circuit 21a by operating the direction changeover valve 37 to the position 37b (upstream side of the check valve 10a).

Next, as shown in FIG. 8 (a), the interval circuit 21a corruption examination zone configuration process to be opened only upstream of the check valve 10a of the section circuit 21a and damaged examination zone, position the directional changeover valve 37 By operating to 37b, the pressure is maintained in the pressure maintaining step in which the hydraulic oil discharged from the pump 34 acts on the section circuit 21a. 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), the section circuits 21a and 21b are set as the breakage inspection areas in the breakage inspection area forming step of opening the stop valves 10a and 10b on the upstream side of the section circuits 21a and 21b. hydraulic oil interval circuit 21a of the pump 34 by operating the changeover valve 37 to the position 37b is discharged, maintaining the pressure in the pressure holding step to be applied 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), the section circuits 21a to 21c are set as the damage inspection area in the damage inspection area configuration step of opening the stop valves 10a to 10c on the upstream side of the section circuits 21a to 21c. pump 34 by operating the changeover valve 37 to the position 37b to hold the pressure in the pressure holding step of reacting hydraulic oil discharged to the interval circuit 21 a - 21 c. 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 section circuits 21a to 21d are set as the damage inspection areas in the damage inspection area configuration step of opening the stop valves 10a to 10d on the upstream side of the section circuits 21a to 21d. maintaining the pressure in the pressure holding step of reacting hydraulic oil discharge pump 34 by operating the changeover valve 37 to the position 37b to the interval circuit 21a to 21d. 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 in the section circuits 21a to 21d exceeds a certain value and is damaged in this damage detection step, the section circuits 21a to 21c are not damaged as described above. It is found that it exists in the circuit 21.

According to the damaged portion detection step, the interval circuit feed and discharge pipes 35 and 36 for connecting the direction changeover valve 37 and the hydraulic cylinder 50 by a plurality of check valve 10. The feed and discharge pipe 35 by the pressure gauge 45 provided a hydraulic oil pump 34 for each work was intervals by a plurality of check valve 10 is discharged to and sequentially supplied sealed multi-purpose port 13a of the check 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. As described above, since the abnormality can be inspected for every short section, it is not necessary to inspect the entire supply / exhaust pipes for damaged portions of the supply / exhaust pipes 35 , 36 due to disasters such as earthquakes or aging. Save time and effort.

Although the embodiment of the method for measuring breakage of the section circuit sequentially has been described above, when it is possible to assume that there is a high possibility that the breakage has occurred, etc. If priority is given to checking of circuit 21d is the damage inspection zone configuration step of interrupting the downstream stop valve 10e, and the interval circuit. 21 to a 21d damage examination zone, operating the direction changeover valve 37 to the position 37b Thus, the pressure is maintained in the pressure maintaining step of filling the section circuits 21a to 21d with the hydraulic oil discharged from the pump 34. Next, immediately after shutting off the stop valve 10d, the pressure gauge 45 provided at the multipurpose port 13a of the stop valve 10e measures whether or not the pressure drop after a certain time exceeds a certain drop value. According to this method of detecting the presence or absence of breakage in the breakage detection step, the section circuit 21d can be preferentially inspected.

In addition to the above description, a breakage inspection that shuts off the upstream stop valve 10c and the downstream stop valve 10e of any continuous section circuit (for example, the section circuit 21c and the section circuit 21d) of the supply and discharge pipes 35 and 36. in zone configuration process, the interval circuit 21d and the interval circuit 21c and damage examination zone, the pressure holding step applying a pressure from another hydraulic source to the pump 34, such as a portable general formula hydraulic source multipurpose port 13b of the check valve 10c And detecting a pressure drop within a certain time in the stop valve 10 on the downstream side of the damage inspection area that has become possible to be inspected, and detecting a damage when the value of the drop reaches a certain value. There is a way to detect damage. In this method, the plurality of section circuits 21 are used as the damage inspection area, but a single section circuit 21 may be used as the damage inspection area.

  As described above, when repairing a place 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. Furthermore, although the multi-purpose port 13b of the stop valve 10 is provided on one side on both sides, as a configuration on which two are provided, a pressure gauge is installed on one side and a general hydraulic power source is connected on the other side, while pressurizing. Pressure measurement is possible.

  The multi-purpose port 13a of the stop valve 10 is provided with a pressure gauge 45 for measuring a pressure drop in the section circuit, a general hydraulic source for applying pressure to the section circuit, and a bypass circuit for bypassing the section circuit. In addition, in the case of repairing the section circuit, etc., installation of a device for releasing the pressure enclosed in the section circuit is installed, and the stop valve 10 constitutes the section circuit so that the section circuit is partially It has the effect of connecting equipment necessary for inspection and repair.

  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 having a passage 156 is provided inside the center of the valve main body 165, and the 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 the driving of the motor 151, whereby the ball valve 159 is rotated together with the shaft 152, and the port 1 1 8a and the port 1 1 8b are communicated with the passage 156. 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.

1 hydraulic circuit 10a~10k stop valve 21a~21e interval circuit 22a~22e interval circuit 30 oil tank 34 pump 35 Kyuhaikan 35a hose 36 Kyuhaikan 36a hose 37 direction changeover valve 37a position 37b position 37c position 50 the hydraulic drive system (Hydraulic cylinder)
51 Rod 52 Cylinder body 60 Multi-function valve 61 Stop valve 62 Stop valve 63 Stop valve

Claims (1)

A hydraulic drive that drives actuated devices such as sluices and industrial machinery;
A supply and discharge pipe for supplying and discharging hydraulic pressure oil to and from the hydraulic drive device;
A plurality of stop valves provided on the supply and discharge pipes and having an opening and closing function;
A section circuit formed by the stop valve;
Comprising
A hydraulic oil filling section configuration step of closing the upstream stop valve and the downstream stop valve of the section circuit to configure the hydraulic oil filling section;
A vacuum holding step for holding the hydraulic oil filling zone configured in the hydraulic oil filling zone configuration step in a vacuum; and
A hydraulic oil filling step of filling the hydraulic oil filling area held in vacuum in the vacuum holding step with pressurized hydraulic oil;
A hydraulic fluid filling method for a hydraulic circuit, comprising:

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