JP2023070996A - Water gate open/close device and hydraulic drive unit - Google Patents

Abstract

To provide a water gate open/close device which can ensure safety even when a motor for lifting a door body has a failure.SOLUTION: A water gate open/close device 1 is provided with: a hydraulic motor 15 connected to a door body 3 and lifting the door body 3; hydraulic sources 16a and 16b including pumps 33a and 33b and motors 34a and 34b driving the pumps to allow control of a discharge rate and a discharge direction; a first close circuit 17 connecting the hydraulic motor 15 and the pumps 33a and 33b; and fail-safe means 23 for limiting fall of the door body 3 by its own weight when the hydraulic sources 16a and 16b are inoperable and limitation of a rotating shaft 15 of the hydraulic motor 15 is released. Consequently, safety is ensured by limiting rapid fall of the door body 3 by its own weight even when the motors 34a and 34b for lifting the door body have failure.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sluice gate opening/closing device and a hydraulic drive unit for opening and closing a sluice gate.

Generally, in order to open and close the gates of water gate facilities installed in rivers, canals, and dams, the gates are raised and lowered by driving an electric motor connected to the gates in the opening/closing direction. In addition, when a large-scale disaster occurs, for example, when flooding occurs due to high tide, localized heavy rain, or the like, or tsunami occurs due to an earthquake or the like, it is necessary to quickly close the water gates. Here, the water gate means not only water gates installed in rivers, but also gates in general, such as sluice gates, weirs, tidal gates, locks, water intake or discharge facilities of dams, and water control facilities.

As a device for quickly closing a water gate, a water gate opening/closing device is known that raises and lowers a gate body by rotationally driving a hydraulic motor (see, for example, Patent Document 1). In addition, while a hydraulic motor is used to raise and lower the gate body, in the event of a power outage due to a disaster, the hydraulic motor can be used as a hydraulic pump to reduce the speed of the gate body's own weight. A water gate opening/closing device with a self-weight lowering function (see, for example, Patent Document 2) is known.

In the water gate hydraulic drive system according to Patent Document 1, the electric motor for driving the hydraulic motor and the electric motor for driving the charge auxiliary pump are shared by one electric motor. 2. Description of the Related Art Some water gate opening/closing devices are provided with separate electric motors for driving hydraulic motors and electric motors for driving auxiliary pumps for charging.

Japanese Patent No. 5112195 Japanese Patent No. 5314791

In the above-described conventional water gate opening and closing device, if one of the electric motors for driving the hydraulic motor for raising and lowering the gate malfunctions, the water gate opening and closing operation may not be performed in a state in which the malfunction is not recognized. When a command is issued, the hydraulic pressure from the charge pressure auxiliary pump associated with the driving of the other electric motor releases the mechanical brake that restrains the rotary shaft of the hydraulic motor while one of the electric motors is not energized. If the electromagnetic switching valves and the like of the hydraulic circuit are open, the rotary shaft of one of the electric motors may freely rotate, causing the door to drop suddenly, and there is room for improvement.

In addition, in the above-described conventional water gate opening and closing device, when the charge pressure auxiliary pump fails, hydraulic pressure cannot be applied to the mechanical brake that restrains the rotating shaft of the hydraulic motor, and the opening and closing operation of the water gate, that is, the lifting operation of the gate body cannot be performed. I can't. As a result, it becomes impossible to raise and lower the door until the charge pressure auxiliary pump is repaired. In short, even if the hydraulic pressure of the hydraulic circuit is in a normal state, unless the charge pressure auxiliary pump, which is an auxiliary function, is in a normal state, the door cannot be moved up and down, which causes inconvenience.

Furthermore, in the hydraulic drive system for the water gate described in Patent Document 1, the hydraulic motor and the hydraulic drive system separately placed connect the hydraulic power source and the hydraulic motor with a closed circuit, thereby reducing the number of components of the circuit. , the heat generated by the resistance is suppressed. However, in facilities where the gate body moves up and down at a high height (lifting height), such as water gates installed in dams, when the gate body is opened and closed continuously, the operation time of the water gate opening and closing device becomes longer, and the hydraulic oil closes. By continuing to circulate in the circuit, the temperature of the hydraulic oil rises and heat is accumulated. Therefore, for example, a flushing circuit is provided to cool the inside of the closed circuit.

However, in this case, a large-capacity tank is required to store the hydraulic oil required for cooling. In addition, since the tank has an open structure and there is a risk of leakage from the open portion, a gap is required to provide a margin for the required amount of oil, and a large-capacity tank is required. Furthermore, in order to prevent hydraulic oil from leaking into rivers, dam lakes, etc. and contaminating it, it is necessary to take measures against oil leakage, such as oil pans and oil dikes, depending on the capacity of the open-structure tank.

Furthermore, in the water gate opening and closing device described in Patent Document 2, in order to temporarily return the hydraulic oil to the tank of the open structure and cool it when the dead weight is lowered, and to prevent chattering (abnormal noise, vibration) of the hydraulic motor, The hydraulic pressure generated by the rotation of the hydraulic motor rotates the boost pressure hydraulic motor, and this rotation drives the boost pressure hydraulic pump connected to the boost pressure hydraulic motor, and the hydraulic oil having the charge pressure is input to the hydraulic motor. side (low pressure side). In this case, since the hydraulic oil is temporarily returned to the open-structured tank, in order to supply the hydraulic oil having the charge pressure to the input side (low pressure side) of the hydraulic motor, the hydraulic oil that flows into the tank due to the fall of the door body's own weight must be increased. Since no pressure is generated in the circuit if there is no flow rate, the boost pressure hydraulic pump needs to discharge more hydraulic oil than the inflow amount, so the capacity becomes large.

In addition, in the water gate switchgear with a self-weight lowering function that uses a closed hydraulic circuit, when lowering the heavy gate body at high speed, the flow rate is usually throttled by a flow control valve to keep the gate body at a stable speed. However, the drop energy is converted into heat energy by the throttle of the flow control valve, and the hydraulic oil continues to circulate in the closed circuit, causing the temperature of the hydraulic oil to rise sharply. Therefore, it is necessary to return the hydraulic oil to the tank once and circulate it for cooling, or to provide cooling equipment such as an oil cooler or a flushing circuit. On the other hand, without a flow control valve, the hydraulic pump and servomotor for opening and closing operations are rotated by the flow rate of hydraulic oil flowing in a closed circuit, and the servomotor is used as a generator to generate regenerative resistance (dynamic brake) using regenerative current. It can be lowered by its own weight, but since the speed of lowering by its own weight becomes faster than the opening and closing speed of the door body, the required output becomes large. A current resistor is required. Therefore, the equipment becomes large and costly.

Furthermore, due to the deterioration of the existing water gate equipment and the request for the addition of a dead weight descent function, etc., when replacing the water gate operating device, there is also a demand for a smaller water gate operating device due to the installation space.

The present invention has been devised in view of this point, and is intended to ensure safety and enable the door to be raised and lowered even when the electric motor for raising or lowering the door or the charge pressure pump fails. Another object of the present invention is to provide a sluice gate opening/closing device and a hydraulic drive unit that can reduce the size and weight of the hydraulic fluid by suppressing the temperature rise of the hydraulic fluid while adopting a closed circuit as the hydraulic circuit.

As a means for solving the above-mentioned problems, the invention according to claim 1 of the water gate opening and closing device is a water gate opening and closing device for opening and closing a water gate, the water gate opening and closing device being connected to a door body for opening and closing the water gate, and hydraulically operating the door. A hydraulic pressure source that includes a hydraulic motor for raising and lowering a body, a pump, and an electric motor that drives the pump, and that is capable of controlling the amount and direction of discharge; a circulating closed circuit; and fail-safe means for regulating the fall of the door by its own weight when the hydraulic pressure source is inoperable and the rotation shaft of the hydraulic motor is released from restraint. The safe means is provided in the closed circuit, and includes an emergency cutoff valve that closes when the flow rate of the hydraulic fluid passing through per unit time exceeds a predetermined flow rate to cut off the flow of the hydraulic fluid in the closed circuit. sluice gate switchgear.

In the invention of claim 1, if the hydraulic pressure sources are inoperable, for example, if two hydraulic pressure sources are provided, either one or both of the two hydraulic pressure sources are inoperable. Even if the restraint of the rotating shaft of the hydraulic motor is released, the fall of the door by its own weight can be restricted by the fail-safe means. As a result, it is possible to ensure the safety of the water gate operator. Specifically, the fail-safe means comprise an emergency shut-off valve in the closed circuit. When the hydraulic pressure source is inoperable and the solenoid switching valve provided in the closed circuit is energized to be in an open state, if the restraint of the rotary shaft of the hydraulic motor is unintentionally released, the door body tries to fall under its own weight. Then, the flow of the hydraulic fluid in the closed circuit rapidly increases, but when the flow rate of the hydraulic fluid per passing unit exceeds a predetermined flow rate, the emergency shutoff valve closes, shutting off the flow of the hydraulic fluid in the closed circuit. be. As a result, subsequent sudden drop of the door can be regulated. Also, by adopting an emergency shutoff valve, the pressure loss in the closed circuit can be minimized.

The water gate opening/closing device of claim 2 is characterized in that, in the invention of claim 1, a closed tank communicated across the closed circuit, and a charge pressure source for supplying the hydraulic fluid in the storage tank to the closed tank. , is provided.

In the invention of claim 2, there are effects described below. That is, the hydraulic fluid leaked from the hydraulic motor, the hydraulic pressure source, etc. is stored in the storage tank, and the hydraulic fluid whose temperature has not risen is previously stored in the sealed tank. By connecting this closed tank from the hydraulic motor to the suction side when the door body is lowered, the charge pressure source can remove from the storage tank the amount of hydraulic fluid that has leaked from the hydraulic motor and the pump of the hydraulic pressure source. The hydraulic fluid that has not risen in temperature after being sucked is discharged into a closed tank, and the hydraulic fluid that has not risen in temperature is supplied from the closed tank to the suction side of the hydraulic motor.

In addition, the hydraulic fluid in the closed circuit can be cooled with a small flow rate, and the flow rate can be maintained. As a result, the discharge amount of the charge pressure source (electric motor, pump, etc.) can be suppressed, and the size of the charge pressure source can be reduced. Moreover, by constructing the tank as a closed tank, it is possible to construct the tank more compactly than a tank having an open structure without requiring an air gap. Furthermore, by constructing the tank as a closed tank, even if a leak occurs from the piping, the leakage is so small that the pressure drops, and a large amount of the hydraulic fluid in the closed tank does not leak out. Further, since the inside of the closed circuit is cooled by the hydraulic fluid in the closed tank, only a small amount of hydraulic fluid is required to store the hydraulic fluid in the storage tank, so the storage tank can be made smaller.

Since the storage tank is an open tank, there is a possibility that a considerable amount of the hydraulic fluid in the tank will leak out. However, the structure is sufficient to store a small amount of hydraulic fluid, and it is compact. In addition, it is possible to prevent the hydraulic fluid from flowing out into rivers and dam lakes and causing contamination. As a result, it is possible to reduce the size of the entire water gate operator. Furthermore, by reducing the size of the entire water gate operating device, the weight of the entire water gate operating device can be reduced, and the size reduction eliminates the weight increase due to the expansion of the operation room. Even so, seismic reinforcement of water gate equipment due to increased weight is not required, and costs can be reduced.

The water gate opening/closing device according to claim 3 is the invention according to claim 1 or 2, wherein a dead weight lowering circuit communicated with the closed circuit and the closed tank, and a flow control valve provided in the dead weight lowering circuit. , is provided.
In the third aspect of the invention, the flow rate of hydraulic oil flowing through the dead weight lowering circuit is throttled by the flow control valve, so that the door body can be lowered stably at an appropriate dead weight lowering speed. Further, the self-weight lowering circuit allows the hydraulic motor and the closed tank to communicate with each other in a closed circuit. As a result, the hydraulic fluid that has flowed along the self-weight lowering circuit flows into the closed tank, and the hydraulic fluid that has not risen in temperature and is stored in the closed tank flows into the closed circuit and circulates. , the working fluid can be easily replaced, and the cooling effect of the closed circuit can be obtained with the working fluid stored in the closed tank, the temperature of which has not risen. In addition, when the weight of the door body is lowered, a pressure (charge pressure) above a certain level is applied to the suction side of the hydraulic motor by applying more than the amount of hydraulic fluid that has leaked from the hydraulic motor from the charge pressure source. can prevent cavitation from occurring.

According to a fourth aspect of the present invention, there is provided a water gate opening and closing device for opening and closing a water gate, comprising: a hydraulic motor connected to a door member for opening and closing the water gate and for raising and lowering the door member by hydraulic pressure; and a pump. and an electric motor for driving the pump, a hydraulic pressure source capable of controlling the discharge amount and the discharge direction, a closed circuit in which the hydraulic motor and the pump are communicated to circulate the hydraulic fluid, and a charge pressure source that supplies hydraulic fluid to the closed circuit and supplies hydraulic fluid in the reservoir tank to a brake mechanism to release the rotary shaft of the hydraulic motor; In the event of an emergency, the door body is provided with an emergency door liftable means that allows the door body to be lifted and lowered by releasing the restraint of the rotation shaft of the hydraulic motor by the brake mechanism.
According to the fourth aspect of the invention, even if the charge pressure source is inoperable, the emergency door lifting means can release the restraint of the rotary shaft of the hydraulic motor by the brake mechanism, allowing the door to move up and down. can do.

In the water gate opening/closing device of claim 5, in the invention of claim 4, the emergency door liftable means is provided in the closed circuit, and the hydraulic fluid in the storage tank is returned to the closed circuit. and an electromagnetic switching valve that is opened by an operator's operation to supply the hydraulic fluid in the closed circuit to the brake mechanism when the charge pressure source becomes inoperable.
In the fifth aspect of the invention, the hydraulic motor or the pump of the hydraulic pressure source always leaks the hydraulic fluid into the storage tank, and when the charge pressure source becomes inoperable, the closed circuit becomes negative pressure. A check valve allows hydraulic fluid to be replenished (sucked) from within the reservoir into the closed circuit. Further, the operator operates the control panel to switch the electromagnetic switch valve so that the hydraulic fluid flows in a predetermined direction. As a result, normally, hydraulic pressure is applied to the brake mechanism (mechanical brake) by the charge pressure source to release the brake mechanism that restrains the rotating shaft of the hydraulic motor. By applying the hydraulic pressure of the circuit to the brake mechanism, it is possible to release the restraint on the rotating shaft of the hydraulic motor. Even if the charge pressure source fails and is inoperable, the operator can temporarily raise or lower the door until the charge pressure source is repaired. .

The water gate opening and closing device according to claim 6 is the invention according to claim 4 or 5, wherein a closed tank communicated across the closed circuit, and a self-weight lowering circuit communicated with the closed circuit and the closed tank. and a flow control valve provided in the self-weight lowering circuit.
In the invention of claim 6, it is possible to achieve the same effects as those of the inventions of claims 2 and 3 described above.

In the water gate opening and closing device of claim 7, in the invention of any one of claims 1 to 6, a It is characterized by having a brake circuit that releases from the high pressure side to the low pressure side.
In the seventh aspect of the present invention, even if the hydraulic pressure in the closed circuit exceeds a predetermined pressure, the relief valve prevents the hydraulic pressure from simply being released into the storage tank, and allows the hydraulic pressure to escape to the closed circuit. It can escape from the high pressure side to the low pressure side. In other words, when the hydraulic motor (pump function) that rotates at high speed during the fall of its own weight is stopped, the brake circuit allows the abnormal hydraulic pressure on the discharge side to escape from the hydraulic motor to the suction side.

An eighth aspect of the invention related to a hydraulic drive unit is a hydraulic drive unit for moving an object to be moved, comprising: a hydraulic motor for moving the object to be moved by hydraulic pressure; a reduction gear connected to a pump and an electric motor for driving the pump, a hydraulic pressure source capable of controlling a discharge amount and a discharge direction; and a closed tank communicating across the closed circuit, the hydraulic fluid in the storage tank is supplied to the closed tank, and the hydraulic fluid in the storage tank is supplied to the rotating shaft of the hydraulic motor. a charge pressure source that supplies the brake mechanism for release.
In the eighth aspect of the invention, a sufficient cooling effect can be obtained for the hydraulic fluid circulating in the closed circuit, and the charge pressure source, storage tank, etc. can be made smaller and lighter, and the entire hydraulic drive unit can be made smaller and lighter. can do. As a result, it is possible to reduce the size and weight of the entire device in which the hydraulic drive unit is mounted.

The hydraulic drive unit according to claim 9 is the hydraulic drive unit according to claim 8, wherein the hydraulic motor, the speed reducer, the hydraulic pressure source, the closed circuit, the closed tank, and the charge pressure It is characterized in that the source and said storage tank are integrated.
In the ninth aspect of the invention, the installation space for installing the device equipped with the hydraulic drive unit can be made compact.

According to the water gate opening and closing device according to the present invention, even in a state where the electric motor for raising and lowering the door is out of order, it is possible to suppress the sudden fall of the door by its own weight, thereby ensuring safety. . Further, according to the water gate opening and closing device of the present invention, even when the charge pressure source fails, the gate body can be moved up and down. Furthermore, according to the water gate opening/closing device according to the present invention, it is possible to suppress the temperature rise of the hydraulic fluid, and to achieve a reduction in size and weight. Furthermore, according to the hydraulic drive unit according to the present invention, it is possible to obtain the cooling effect of the hydraulic fluid circulating in the closed circuit, and to reduce the size and weight of the hydraulic drive unit as a whole.

FIG. 1 is a hydraulic circuit diagram employed in a water gate opening/closing device according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a state in which the hydraulic drive unit employed in the water gate opening/closing device according to the embodiment of the present invention is connected to the drum. 3A and 3B are schematic diagrams of a hydraulic drive unit employed in a water gate operator according to an embodiment of the present invention, where (a) is a front view, (b) is a plan view, and (c) is a side view.

A water gate opening/closing device 1 according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3. FIG.
The water gate opening/closing device 1 according to the embodiment of the present invention is for opening and closing water gates installed in rivers, canals, dams, etc. , the door 3 can be lowered by its own weight at a safe and appropriate lowering speed. In the following description, a 1-motor/1-drum type wire rope type water gate operator will be described as an example, but other types of water gate operator such as a 1-motor/2-drum type or a 2-motor/2-drum type will be described. can be similarly applied to

As shown in FIG. 1, in the water gate opening/closing device 1 according to the present embodiment, a door 3 is vertically supported between a pair of left and right gateposts (not shown) constituting a water gate (not shown). A water gate opening/closing device 1 according to this embodiment is provided with a drum 6 for winding and drawing out a wire rope 4 connected to a door 3 . An output shaft 8 of a speed reducer 7 is connected to a rotary shaft 6a (see FIG. 2) of the drum 6 through a torque transmission member 6b (see FIG. 2) so as to be relatively non-rotatable. A rotary shaft 15a of a hydraulic motor 15 is connected to the input shaft 9 of the speed reducer 7 so as to be relatively non-rotatable. As the rotary shaft 15a of the hydraulic motor 15 rotates, the speed reducer 7 and the drum 6 rotate, so that the wire rope 4 is wound up or pulled out to raise or lower the door 3. As shown in FIG. In addition, reference numeral 5 in FIG. 2 denotes a sheave which is provided at the upper portion of the door 3 and around which the wire rope 13 is wound.

A water gate opening/closing device 1 according to the present embodiment includes a hydraulic drive unit 10, as shown in FIGS. The hydraulic drive unit 10 includes a hydraulic motor 15, hydraulic sources 16a and 16b, a first closed circuit 17, a second closed circuit 18 including a dead weight lowering circuit 20, a charge pressure source 19, a closed tank 21a, 21b, a storage tank 22, a fail-safe means 23, and an emergency door liftable means 24. In this embodiment, the hydraulic drive unit 10 is employed in the water gate opening/closing device 1, and the moving object corresponds to the door 3. As shown in FIG. Referring to FIG. 1, hydraulic motor 15 is provided with brake mechanism 30 . Brake mechanism 30 is a mechanical brake. The brake mechanism 30 normally restrains the rotating shaft 15a of the hydraulic motor 15 by the biasing force of the spring, and the hydraulic pressure supplied from the charge pressure source 19 resists the biasing force of the spring, and rotates the hydraulic motor 15. , the restraint of the rotating shaft 15a is released.

Referring to FIG. 1, the hydraulic sources 16a, 16b include pumps 33a, 33b and electric motors 34a, 34b arranged in parallel in a first closed circuit 17, which will be detailed later. The pumps 33a and 33b are constant displacement pumps capable of discharging hydraulic oil in two directions and controlling the amount of hydraulic oil discharged by varying the rotational speeds of the electric motors 34a and 34b. The pumps 33a, 33b communicate with the storage tank 22 via drain lines 36a, 36b.

The electric motors 34a, 34b are AC servo motors that can rotate forward and backward, and are connected to the pumps 33a, 33b. The electric motors 34a and 34b are operated by a three-phase power supply, are electrically connected to an operation panel (not shown), and are controlled by the operation panel. In this embodiment, the hydraulic sources 16a and 16b employ AC servo motors as the electric motors 34a and 34b and constant displacement pumps as the pumps 33a and 33b, which are capable of controlling the amount and direction of discharge. there is In addition, the hydraulic sources 16a and 16b may be composed of a three-phase induction motor, an inverter and a constant displacement pump, or a three-phase induction motor and a variable displacement pump.

The hydraulic motor 15 and the pumps 33a, 33b of the hydraulic sources 16a, 16b are communicated by a first closed circuit 17. As shown in FIG. Specifically, one port of the hydraulic motor 15 (left side of the paper surface of FIG. 1) and one port of the pumps 33a and 33b of the hydraulic power sources 16a and 16b (left side of the paper surface of FIG. 1) are connected to a communication path 38a and a connection They are communicated via paths 40a and 41a. The other port of the hydraulic motor 15 (the right side of the paper surface of FIG. 1) and the other port of the pumps 33a and 33b of the hydraulic sources 16a and 16b (the right side of the paper surface of FIG. 1) are connected by a communication path 38b and connection paths 40b and 41b. communicated via The communication path 38a and the connection paths 40a, 41a are communicated with each other. The communication path 38b and the connection paths 40b, 41b communicate with each other.

The communication paths 38a, 38b are located on the hydraulic motor 15 side, and the connection paths 40a, 40b, 41a, 41b are located on the hydraulic power sources 16a, 16b side. The first closed circuit 17 communicates with the communication path 38a and the connection paths 40a and 41a and the communication path 38b and the connection paths 40b and 41b with the hydraulic motor 15 and the pumps 33a and 33b of the hydraulic sources 16a and 16b as boundaries. Configured. In other words, the first closed circuit 17 communicates the hydraulic motor 15 with the pumps 33a, 33b of the hydraulic sources 16a, 16b. Hydraulic oil is configured to circulate through the first closed circuit 17 .

The first closed circuit 17 is provided with a flushing function circuit 44 arranged to straddle the communication path 38a and the communication path 38b. The flushing function circuit 44 is for returning excess hydraulic fluid above the charge pressure to the storage tank 22 . The flushing function circuit 44 includes a flushing valve 45 and a flushing relief valve 46 . The flushing valve 45 communicates with the communication path 38 a and the communication path 38 b of the first closed circuit 17 . The flushing relief valve 46 communicates with the flushing valve 45 . The flushing relief valve 46 communicates with the storage tank 22 . The flushing function circuit 44 is provided to suppress cavitation that occurs in the hydraulic motor 15 when the door body 3 is lowered by its own weight, and to cool the heat generated by the hydraulic oil.

Electromagnetic switching valves 48, 48 are arranged in connection paths 40a, 41a of the first closed circuit 17, respectively. Each of the electromagnetic switching valves 48, 48 is energized and opened under the control of the operating panel. On the other hand, when the energization from the operation panel is canceled, the electromagnetic switching valves 48, 48 are closed. The charge pressure source 19 supplies hydraulic fluid from the storage tank 22 to the first closed circuit 17 and the brake mechanism 30 . The charge pressure source 19 has a charge pump 51 and an electric motor 52 . The electric motor 52 is connected to the shaft portion of the charge pump 51 so as to be relatively non-rotatable. The rotation of the electric motor 52 drives the charge pump 51 to rotate. The storage tank 22 is an open or closed tank and communicates with the charge pump 51 via a suction path 54 . A filter 55 is provided in the suction path 54 .

Hydraulic oil that has leaked from the hydraulic motor 15 returns to the storage tank 22 via the communication path 58 . A check valve 63 is provided in the communication path 58 . Hydraulic oil from the brake mechanism 30 returns to the storage tank 22 via the communication path 59 (including the electromagnetic switching valve 108 and the electromagnetic switching valve 72). Hydraulic oil that has leaked from the pumps 33a and 33b of the hydraulic sources 16a and 16b returns to the storage tank 22 via drain lines 36a and 36b.

A communication path 60 communicating with the storage tank 22 is communicated with the downstream side of the charge pressure source 19 (left side of the charge pressure source 19 in FIG. 1). A relief valve 65 is provided in the communication path 60 . The charge pump 51 of the charge pressure source 19 communicates with the brake mechanism 30 via the first discharge path 68 . A check valve 73 , an electromagnetic switching valve 72 and an electromagnetic switching valve 108 are provided in the first discharge path 68 . Also, the charge pump 51 communicates with a sealed tank 21a to be described later via a second discharge path 69 . A check valve 75 and a flow control valve 76 are provided in the second discharge path 69 .

The electric motor 52 can be operated by the control power supply (single-phase power supply) of the control panel in the normal state. On the other hand, the electric motor 52 can be operated by an uninterruptible power supply (single-phase power supply), a single-phase power supply from a small portable generator, or a DC power supply from a battery during a power failure. The electric motor 52 is electrically connected to the operating panel and controlled by the operating panel. The electromagnetic switching valve 72 can be operated by the control power supply (single-phase power supply) of the control panel in the normal state. The electromagnetic switching valve 72 can be operated by an uninterruptible power supply (single-phase power supply), a single-phase power supply from a small portable generator, or a DC power supply from a battery during a power failure. The electromagnetic switching valve 72 is electrically connected to the operating panel and controlled by the operating panel.

The closed tanks 21a and 21b store a predetermined amount of hydraulic oil to send hydraulic oil to the suction side (communication path 38b of the first closed circuit 17) of the hydraulic motor 15 when the door body 3 is lowered by its own weight. be. The closed tanks 21a, 21b are airtightly closed. The closed tanks 21a and 21b are communicated with each other. The closed tanks 21 a and 21 b communicate with the first closed circuit 17 . Specifically, the closed tank 21a is communicated with the discharge side (the communication path 38a of the first closed circuit 17) through the dead weight lowering circuit 20 when the door body 3 is lowered under its own weight. The closed tank 21b communicates with the suction side (communication path 38b of the first closed circuit 17) through the communication path 78 when the door body 3 is lowered under its own weight. With this configuration, when the weight of the door 3 is lowered, the sealed tanks 21a and 21b and the hydraulic motor 15 are communicated with each other through the second closed circuit 18 including the circuit 20 for lowering the weight and the communication path 78. .

The dead weight descent circuit 20 includes a dead weight descent path 83 . The dead weight lowering path 83 communicates the sealed tank 21a with the communication path 38a of the first closed circuit 17. As shown in FIG. A flow control valve (flow control valve) 85 , a gate valve 86 , a relief valve 87 , an electromagnetic switching valve 88 and a check valve 89 are provided in the self-weight lowering path 83 . The flow control valve 85 can appropriately change the lowering speed of the door 3 by controlling the degree of opening when the door 3 is lowered by its own weight. A flow control valve 90 and a shut-off valve 91 are provided in parallel with the flow control valve 85 in the dead weight lowering path 83 . When the 2-motor, 2-drum type is used, the amount of hydraulic oil discharged to the hydraulic motor 15 is changed by turning on/off the shut-off valve 91 and the action of the flow control valves 85 and 90. During descent, the descent speed difference between both ends in the width direction of the door 3 can be controlled. The electromagnetic switching valve 88 can be operated by an uninterruptible power supply (single-phase power supply), a single-phase power supply from a small portable generator, or a DC power supply from a battery during a power failure. The electromagnetic switching valve 88 is electrically connected to the operating panel and controlled by the operating panel.

A gate valve 92 and a check valve 93 are provided in the communication path 78 . Due to the check valve 93, the hydraulic pressure from the first closed circuit 17 does not act on the closed tank 21b. The closed tank 21 b communicates with the storage tank 22 via a discharge path 80 . A relief valve 81 is provided in the discharge path 80 . In each of the sealed tanks 21a and 21b, when the door body 3 is lowered by its own weight, a second valve is provided for communicating the hydraulic motor 15 and the closed tanks 21a and 21b until the door body 3 is completely lowered by its own weight. Hydraulic oil necessary for cooling is stored by circulating in the closed circuit 18 . A relief valve 81 is provided in the discharge path 80 to form the second closed circuit 18. Therefore, unless the sealed tanks 21a and 21b and the pipes communicating therewith are damaged, air will flow into the second closed circuit 18. Since there is no inflow, even if leakage should occur from between the pipes, the leakage will be so small that the oil pressure will drop.

Further, the first closed circuit 17 is provided with a fail-safe means 23 and an emergency door liftable means 24 . The fail-safe means 23 regulates the fall of the door 3 by its own weight when the hydraulic pressure sources 16a and 16b are inoperable and the restraint of the rotating shaft 15a of the hydraulic motor 15 is released by the hydraulic pressure from the charge pressure source 19. It is. The fail-safe means 23 is provided in an emergency shutoff valve 95a provided in a connection path 40a of the first closed circuit 17 to one hydraulic source 16a and in a connection path 41a of the first closed circuit 17 to the other hydraulic source 16b. and an emergency shutoff valve 95b. The emergency shutoff valve 95a may be provided in the connection path 40b of the first closed circuit 17 to one hydraulic source 16a, and the emergency shutoff valve 95b may be provided in the connection path 41b of the first closed circuit 17 to the other hydraulic source 16b. may be set to Each of the emergency shutoff valves 95a and 95b is closed to shut off the flow of hydraulic oil in the first closed circuit 17 when the flow rate per unit time passing therethrough exceeds a predetermined flow rate.

On the other hand, when the charge pressure source 19 becomes inoperable, the emergency door lifting means 24 releases the restraint of the rotating shaft 15a of the hydraulic motor 15 by the brake mechanism 30, thereby enabling the door 3 to move up and down. It is something to do. The emergency door liftable means 24 includes check valves 100a and 100b that return the hydraulic oil in the storage tank 22 to the first closed circuit 17, and when the charge pressure source 19 becomes inoperable, the operator can and a brake release circuit 101 that supplies the hydraulic fluid of the first closed circuit 17 to the brake mechanism 30 . Connection paths 40a and 40b extending from a suction port and a discharge port of a pump 33a constituting one hydraulic source 16a and the storage tank 22 are communicated by suction paths 103a and 103a.

Check valves 100a, 100a that allow hydraulic fluid to flow from the storage tank 22 to the first closed circuit 17 are arranged in the suction paths 103a, 103a, respectively. Connection paths 41a, 41b extending from the suction port and the discharge port of the pump 33b, which constitutes the other hydraulic source 16b, and the reservoir tank 22 are communicated by suction paths 103b, 103b. Check valves 100b, 100b that allow hydraulic fluid to flow from the storage tank 22 to the first closed circuit 17 are arranged in the suction paths 103b, 103b, respectively.

The brake release circuit 101 can communicate with a bypass path 106 that extends across the communication path 38a and the communication path 38b of the first closed circuit 17, a shuttle valve 107 provided in the bypass path 106, and the shuttle valve 107. and an electromagnetic switching valve 108. The shuttle valve 107 has one inlet that communicates with the communication path 38a via the bypass path 106, the other inlet that communicates with the communication path 38b via the bypass path 106, and an outlet that communicates with each of the inlets. and the outlet is configured to automatically connect to the higher hydraulic side inlet of the pair of inlets. The electromagnetic switching valve 108 normally communicates the first discharge path 68 and the brake mechanism 30 when the charge pressure source 19 is in an operable state. On the other hand, when the charge pressure source 19 is in an inoperable state, it is energized by the control of the control panel to open, and the shuttle valve 107 (first closed circuit 17) and the brake mechanism 30 are configured to communicate with each other. .

Further, the first closed circuit 17 is provided with a brake circuit 110 that releases the hydraulic pressure from the high pressure side of the first closed circuit 17 to the low pressure side when the hydraulic pressure of the first closed circuit 17 exceeds a predetermined pressure. . The brake circuit 110 is positioned closer to the hydraulic motor 15 than the electromagnetic switching valves 48 , 48 . The brake circuit 110 communicates between a pair of main bypass paths 111a and 111b that communicate across the communication path 38a and the communication path 38b of the first closed circuit 17, and the pair of main bypass paths 111a and 111b. A secondary bypass route 112, a pair of check valves 113, 113 provided in one of the main bypass routes 111a and allowing hydraulic fluid to flow from the communication routes 38a and 38b to the secondary bypass route 112, and the secondary bypass route 112. and a pair of check valves 114, 114 provided in the other main bypass route 111b and allowing hydraulic oil to flow from the secondary bypass route 112 to the communication routes 38a and 38b. ing.

The brake valve 115 is configured to open when the hydraulic pressure in the first closed circuit 17 exceeds a predetermined pressure to release the hydraulic oil in the sub-bypass path 112 from one main bypass path 111a side to the other main bypass path 111b side. be. Specifically, even if the hydraulic pressure of the first closed circuit 17 exceeds the predetermined pressure, the hydraulic fluid does not return to the storage tank 22, and the hydraulic circuit 110 causes the hydraulic pressure to be released from the high pressure side of the first closed circuit 17. Applied to the low pressure side.

2 and 3, the hydraulic motor 15 is arranged adjacent to the speed reducer 7. As shown in FIG. The two closed tanks 21a and 21b are arranged above the speed reducer 7 and adjacent to each other. Hydraulic sources 16a and 16b are arranged adjacent to each other above the closed tanks 21a and 21b. A charge pressure source 19 is arranged above the longitudinal ends of the closed tanks 21a and 21b so as to span the two closed tanks 21a and 21b. A storage tank 22 is arranged adjacent to the charge pressure source 19 . As a result, the hydraulic motor 15, the speed reducer 7, the hydraulic pressure sources 16a and 16b, the charge pressure source 19, the closed tanks 21a and 21b, and the storage tank 22 are integrated together with the first closed circuit 17 and the second closed circuit . It is configured as a drive unit 7 .

Next, a method for raising and lowering the door body 3 using the water gate opening/closing device 1 according to the present embodiment in a normal state when the power source is not lost will be described with reference to FIG. 1 .
First, when the power source is not lost and the door 3 is not moved up and down, the rotating shaft 15a of the hydraulic motor 15 is restrained by the brake mechanism 30 and the door 3 cannot be moved up and down. When the door 3 is moved up and down, the operator operates the operation panel to rotate the electric motor 52 of the charge pressure source 19 . Then, the charge pump 51 is rotationally driven by the rotational driving of the electric motor 52 to suck the working oil from the storage tank 22 . After that, the hydraulic oil is supplied to the communication path 38b of the first closed circuit 17 via the second discharge path 69 and the sealed tanks 21a and 21b, and the charge pressure is supplied to the first closed circuit 17. .

Next, the electric motor 34a (34b) of the hydraulic pressure source 16a (16b) is energized under the control of the operating panel, so that the servo is locked. Subsequently, the control panel controls the electromagnetic switching valves 48, 48 of the first closed circuit 17 to open, and the rotation speed of the electric motor 34a (34b) increases stepwise. Subsequently, the electromagnetic switching valve 72 provided in the first discharge path 68 is controlled to be opened by the control of the operation panel, and the hydraulic pressure from the charge pressure source 19 (the electric motor 52 and the charge pump 51) is switched to the first discharge path. 68 to brake mechanism 30 . As a result, the constraint on the rotating shaft 15a of the hydraulic motor 15 is released, and the rotating shaft 15a of the hydraulic motor 15 becomes rotatable.

When the door 3 is raised, the electric motor 34a (34b) of the hydraulic source 16a (16b) rotates to rotate the pump 33a (33b). (see the arrow in FIG. 1), that is, from one of the pumps 33a (33b) (left side of the paper surface of FIG. 1) to one port of the hydraulic motor 15 (see the arrow in FIG. 1 on the left side of the page). Then, the rotation of the hydraulic motor 15 (rotation in the upward direction) is transmitted to the speed reducer 7 and the drum 6, so that the door 3 is raised.

On the other hand, when the door 3 is lowered, the hydraulic oil in the first closed circuit 17 is supplied in the lowering direction of the door 3 (see the arrow in FIG. 1), that is, the pump 33a (33b) of the hydraulic source 16a (16b). 1) to the other port (right side of the paper of FIG. 1) of the hydraulic motor 15 via the connection path 40b (41b) and the communication path 38b. Then, the rotation of the hydraulic motor 15 (rotation in the lowering direction) is transmitted to the reduction gear 7 and the drum 6, so that the door 3 is lowered. Here, when hydraulic fluid flows to the hydraulic motor 15 , hydraulic fluid leaking from the hydraulic motor 15 returns to the storage tank 22 of the charge pressure source 19 via the communication path 58 . Hydraulic oil that has leaked from the pumps 33a and 33b of the hydraulic sources 16a and 16b returns to the storage tank 22 via drain lines 36a and 36b. As a result, the flow rate of hydraulic fluid circulating through the first closed circuit 17 is reduced.

However, since the charge pump 51 of the charge pressure source 19 is driven, the decrease in hydraulic oil passes through the reservoir tank 22→second discharge path 69→sealed tank 21a→sealed tank 21b→communication path 78, The first closed circuit 17 is replenished. As a result, it is possible to compensate for the decrease in hydraulic oil caused by the hydraulic motor 15 . At this time, the amount of hydraulic oil replenished to the first closed circuit 17 is replenished from the closed tanks 21a and 21b with hydraulic oil whose temperature has not risen. can contribute. In the normal state where the power supply is not lost, the electromagnetic switching valve 88 of the dead weight lowering circuit 20 (the dead weight lowering path 83) is in a closed state, so that hydraulic oil does not flow into the dead weight lowering circuit 20. do not have.

It should be noted that when the hydraulic pressure in the first closed circuit 17 exceeds a predetermined pressure due to the brake circuit 110 when the door 3 is moved up and down, the hydraulic pressure is applied from the high pressure side to the low pressure side of the first closed circuit 17 . That is, when the hydraulic pressure of the first closed circuit 17 exceeds a predetermined pressure, the hydraulic pressure of the first closed circuit 17 passes through the brake valve 115 of the sub-bypass route 112 from one main bypass route 111a and the other main bypass route 11b. Then, it is applied to the low voltage side of the first closed circuit 17 .

Next, a method for lowering the gate body 3 at the upper limit position by its own weight when the power source is lost (during a power failure) using the water gate opening and closing device 1 according to the present embodiment will be described with reference to FIG.
When the power supply is lost due to a power failure due to a disaster or the like, the hydraulic power sources 16a and 16b cannot be rotated. The door body 3 in the position does not unintentionally start its own weight descent. When the three-phase power supply is lost due to a power failure during a disaster, etc., the operation panel, the electromagnetic switching valve 72 of the first discharge path 68, the electromagnetic switching valve 88 of the dead weight lowering circuit 20, and the electric motor 52 of the charge pressure source 19 are disabled. It can be operated by using a single-phase power supply such as a blackout power supply or a small portable generator. Here, when the door body 3 is lowered by its own weight, the hydraulic motor 15 functions as a hydraulic pump as a hydraulic braking device that adjusts the speed of lowering the door body 3 by its own weight to an appropriate speed.

Then, the worker lowers the door body 3 by its own weight by operating the operation panel. Then, the electromagnetic switching valves 48, 48 of the first closed circuit 17 are kept closed. Further, the electromagnetic switching valve 88 of the dead weight lowering circuit 20 (the dead weight lowering path 83) is controlled to be open by the control of the operating panel. Further, the electromagnetic switching valve 72 provided in the first discharge path 68 is controlled to be opened by the operating panel. Furthermore, the electromagnetic switch valve 108 of the brake release circuit 101 is maintained in a state in which hydraulic oil is permitted to flow in a predetermined direction. As a result, the second closed circuit 18 is formed by part of the communication paths 38 a and 38 b of the first closed circuit 17 , the gravity lowering path 83 of the gravity lowering circuit 20 , the closed tanks 21 a and 21 b and the communication path 78 .

Subsequently, the electric motor 52 of the charge pressure source 19 is rotationally driven by control of the operation panel, and the charge pump 51 connected to the electric motor 52 is rotationally driven by this rotational driving. Due to the rotational driving of the charge pump 51, hydraulic oil is supplied through the communication path 38b of the first closed circuit 17 via the storage tank 22→second discharge path 69→sealed tank 21a→sealed tank 21b→communication path 78. , the first closed circuit 17 is supplied with the charge pressure. Further, since the electromagnetic switching valve 72 provided in the first discharge path 68 and the electromagnetic switching valve 108 of the brake release circuit 101 are in an open state (an open state in which hydraulic oil flows in a predetermined direction), the charge pump 51 is rotationally driven. Hydraulic oil is thus supplied to the brake mechanism 30 via the storage tank 22 and the first discharge path 68 . As a result, the restraint of the brake mechanism 30 on the rotary shaft 15a of the hydraulic motor 15 is released, and the door body 3 starts to drop under its own weight.

Subsequently, as the weight of the door body 3 drops, the rotation shaft 15a of the hydraulic motor 15 functioning as a hydraulic pump rotates via the drum 6 and the reduction gear 7 . As the rotating shaft 15a of the hydraulic motor 15 rotates, hydraulic oil is drawn into the hydraulic motor 15 through the communication path 38b of the first closed circuit 17 and discharged from the hydraulic motor 15 to the communication path 38a. The hydraulic oil discharged to the communication path 38 a flows into the dead weight lowering path 83 of the dead weight lowering circuit 20 . At this time, the pressure in the first closed circuit 17 becomes negative, and the hydraulic pressure (charge pressure) of the hydraulic oil is greater than a certain level, and the charge pressure source 19 (charge pump 51) causes the storage tank 22→first discharge path 69→ Through the closed tank 21a→closed tank 21b→communication path 78, the fluid is supplied to the communication path 38b of the first closed circuit 17, and the first closed circuit 17 is replenished. When the door body 3 is lowered by its own weight, the charge pressure source 19 applies an amount of hydraulic oil that is equal to or greater than the amount of hydraulic oil that has leaked from the hydraulic motor 15 or the like. A certain pressure (charge pressure) can be applied to the path 38b) to prevent cavitation from occurring.

Subsequently, the hydraulic oil that has flowed from the communication path 38a of the first closed circuit 17 to the dead weight lowering path 83 circulates along the second closed circuit 18 as the weight of the door body 3 lowers. That is, the hydraulic oil that has flowed through the dead weight lowering path 83 flows through the flow control valve 85 and the electromagnetic switching valve 88 into the sealed tank 21a. At this time, the flow rate of hydraulic oil flowing through the dead weight lowering path 83 is throttled and restricted by the flow rate control valve 85, so that the rotation of the rotary shaft 15a of the hydraulic motor 15 is appropriately restricted to the number of revolutions. As a result, the door body 3 can be stably lowered by its own weight at an appropriate gravity lowering speed. When the hydraulic pressure of the dead weight lowering path 83 exceeds a preset hydraulic pressure, the relief valve 87 of the dead weight lowering circuit 20 allows the hydraulic oil in the dead weight lowering path 83 to escape to the closed tank 21a. .

Subsequently, the hydraulic oil that has flowed into the closed tank 21a causes the hydraulic oil that has not risen in temperature and that has been stored in the closed tank 21a in advance to flow into the closed tank 21b. Hydraulic oil that has flowed into the closed tank 21b causes the hydraulic oil that has not risen in temperature previously stored in the closed tank 21b to flow through the communication path 78 to the communication path 38b of the first closed circuit 17. In this way, when the door body 3 drops its own weight, the hydraulic oil circulates through the second closed circuit 18 (including part of the first closed circuit 17), and the temperature inside the sealed tanks 21a and 21b rises. While a part of the first closed circuit 17 and the second closed circuit 18 are cooled by the free hydraulic oil, the door body 3 can be lowered by its own weight to the end. Further, when the hydraulic motor 15 (pump function) rotating at high speed is stopped when the door body 3 is lowered by its own weight, the brake circuit 110 causes the hydraulic motor 15 to communicate with the discharge side (the first closed circuit 17). Abnormal oil pressure in the path 38a) can be released to the suction side (communication path 38b of the first closed circuit 17).

Next, based on the basic operation of the water gate operating device 1 according to the present embodiment described above, first, the operation of the water gate operating device 1 when one of the hydraulic pressure sources 16a and 16b becomes inoperable will be described. do.
Due to the failure of the controller or the like of the electric motor 34a or 34b, the operator does not recognize the failure and the operator operates the operation panel, for example, the door at the upper limit position with respect to the operation panel. Manipulate the body 3, in particular to lower it. Then, the electromagnetic switching valves 48, 48 of the first closed circuit 17 are controlled to open by the control of the operating panel. Further, the electromagnetic switching valve 72 provided in the first discharge path 68 is controlled to be open by control of the operating panel.

Furthermore, the charge pressure source 19 (the electric motor 52 and the charge pump 51) is driven under the control of the operating panel. Then, hydraulic pressure from the charge pressure source 19 is applied to the brake mechanism 30 through the first discharge path 68 . As a result, the constraint on the rotating shaft 15a of the hydraulic motor 15 is released, and the rotating shaft 15a of the hydraulic motor 15 becomes rotatable. At this time, the electric motor 34a or 34b of the oil pressure source 16a or 16b is in a state in which the servo lock is released because the controller or the like is out of order, and the rotating shaft of the electric motor 34a or 34b is in a free state.

Subsequently, in the first closed circuit 17, although hydraulic pressure is being applied by the charge pressure source 19, the rotary shaft 15a of the hydraulic motor 15 is rotatable, so the door 3 moves at a predetermined speed. begins to fall under its own weight at a speed exceeding . Then, at the moment when it starts to drop under its own weight, the flow of hydraulic oil in the first closed circuit 17 rapidly increases, and the rotary shaft 15a of the hydraulic motor 15, the electric motor 34a or 34b, and the rotary shafts of the pump 33a or 33b idle. state. However, one or both of the emergency shut-off valves 95a and 95b of the fail-safe means 23 provided in the first closed circuit 17 are closed when the flow rate of hydraulic oil passing through per unit time exceeds a predetermined flow rate. In order to enter the state, the flow of hydraulic oil in the first closed circuit 17 is cut off by the action of one or both of the emergency shutoff valves 95a and 95b. As a result, the door body 3 is stopped and does not drop by its own weight any more. Thereafter, after confirming that the controllers of the electric motors 34a and 34b are out of order, the operator switches to a predetermined manual operation to drive the other hydraulic source 16a or 16b that is not out of order. will be raised and lowered. In this embodiment, as described above, the operation of the water gate opening/closing device 1 when one of the hydraulic pressure sources 16a and 16b becomes inoperable has been described. Even when it becomes impossible, the same effect is produced.

Next, the operation of the water gate opening/closing device 1 when the charge pressure source 19 (the charge pump 51, the electric motor 52, etc.) becomes inoperable will be described.
Hydraulic oil is always leaking from the hydraulic motor 15 and the hydraulic pumps 33a, 33b of the hydraulic sources 16a, 16b into the storage tank 22, and when the charge pressure source 19 becomes inoperable, the first closed circuit 17 becomes negative pressure. . Therefore, hydraulic oil is replenished (sucked) from the storage tank 22 to the first closed circuit 17 by the check valves 100a and 100b of the emergency door liftable means 24 .

Subsequently, when the operator operates the control panel, the electromagnetic switching valve 108 of the emergency door liftable means 24 is switched so that the operating oil flows in a predetermined direction. moves to the left. Then, hydraulic fluid in the first closed circuit 17 is applied to the brake mechanism 30 via the shuttle valve 107 and the electromagnetic switching valve 108 . As a result, the restraint on the rotating shaft 15a of the hydraulic motor 15 by the brake mechanism 30 is released. By releasing the restraint of the hydraulic motor 15 on the rotary shaft 15a by the brake mechanism 30, the door 3 can be moved up and down. After that, depending on the situation at that time, the operator can raise and lower the door 3 by manual operation or the like. At this time, the charge pressure to prevent cavitation by the hydraulic motor 15, which is required when the door body 3 is lowered by its own weight, is not necessarily required when the hydraulic motor 15 rotates at a low speed during the lifting operation.

When the door 3 is at the upper limit position, the first closed circuit 17 is replenished with hydraulic oil from the storage tank 22 by the check valves 100a and 100b when the door 3 can be lowered. Although the hydraulic pressure is slightly maintained, the door 3 may start to fall under its own weight at a speed exceeding a predetermined speed because the restraint of the hydraulic motor 15 to the rotating shaft 15a by the brake mechanism 30 is released. There is Therefore, it is necessary for the operator to control the lowering motion of the door 3 using a manual handle or other braking means. Further, when the charge pressure source 19 (charge pump 51, electric motor 52, etc.) becomes inoperable, it is impossible to operate the self-weight lowering of the door 3 in the state where the power source is lost (during a power failure) as described above. becomes.

As described above, the water gate opening/closing device 1 according to the present embodiment restricts the door body 3 from falling under its own weight when the hydraulic sources 16a and 16b are inoperable and the restraint of the rotating shaft 15a of the hydraulic motor 15 is released. A fail-safe means 23 is provided. The fail-safe means 23 is provided in the first closed circuit 17, and when the flow rate per unit time passing through exceeds a predetermined flow rate, the emergency shutoff valve 95a that closes and shuts off the flow of hydraulic oil in the first closed circuit 17, 95b.

As a result, when the hydraulic pressure sources 16a and 16b are inoperable and the restraint of the rotary shaft 15a of the hydraulic motor 15 by the brake mechanism 30 is released by the hydraulic pressure from the charge pressure source 19, the door body 3 falls by its own weight. Begin to. Then, the flow of hydraulic oil in the first closed circuit 17 rapidly accelerates due to the fall of the door body 3 by its own weight. Since either one or both are closed, the flow of hydraulic oil in the first closed circuit 17 is interrupted. As a result, subsequent rapid dropping of the door 3 can be regulated. Moreover, the pressure loss in the first closed circuit 17 can be minimized by employing the emergency shutoff valves 95a and 95b.

In addition, the water gate opening/closing device 1 according to the present embodiment is provided with an emergency door lifting means 24 that enables the door 3 to move up and down when the charge pressure source 19 becomes inoperable. The emergency door liftable means 24 is provided in the first closed circuit 17, and the check valves 100a and 100b for returning the hydraulic oil in the storage tank 22 to the first closed circuit 17 and the charge pressure source 19 are disabled. and an electromagnetic switching valve 108 that is opened by an operator's operation to supply the hydraulic oil in the first closed circuit 17 to the brake mechanism 30 when the first closed circuit 17 is closed.

As a result, hydraulic fluid is always leaking into the storage tank 22 from the hydraulic motor 15 and the pumps 33a and 33b of the hydraulic sources 16a and 16b. Hydraulic fluid can be replenished (sucked) from the storage tank 22 into the closed circuit by the check valves 100a, 100b. Further, the operator operates the control panel to switch the electromagnetic switching valve 108 so that the working oil flows in a predetermined direction. By switching the electromagnetic switch valve 108, the hydraulic pressure of the first closed circuit 17 is applied to the brake mechanism 30, so that the hydraulic motor 15 can be released from the rotation shaft 15a. Even if the charge pressure source 19 fails and is inoperable, the operator can temporarily move the door 3 up and down.

Further, the water gate opening/closing device 1 according to the present embodiment is arranged so as to straddle the first closed circuit 17, and when the hydraulic pressure of the first closed circuit 17 exceeds a predetermined pressure, the hydraulic pressure of the first closed circuit 17 is A brake circuit 110 is provided to release the pressure from the pressure to the low pressure side. Even if the hydraulic pressure in the first closed circuit 17 exceeds a predetermined pressure, the brake circuit 110 allows the hydraulic pressure to escape from the high pressure side of the first closed circuit 17 to the low pressure side. Then, as described above, when the hydraulic motor (pump function) 15 rotating at high speed is stopped during self-weight descent, the brake circuit 110 causes the hydraulic motor 15 to move toward the discharge side (first closed circuit). 17 can be released to the suction side (communication path 38b of the first closed circuit 17).

Furthermore, the water gate opening/closing device 1 according to the present embodiment includes the closed tanks 21a and 21b that are communicated across the first closed circuit 17, and the charge tank that supplies the hydraulic oil in the storage tank 22 to the closed tanks 21a and 21b. a pressure source 19; As a result, the charge pressure source 19 sucks from the storage tank 22 an amount equal to or greater than the amount of hydraulic oil that has leaked from the hydraulic motor 15 and the pumps 33a and 33b of the hydraulic sources 16a and 16b, discharges it to the closed tanks 21a and 21b, and discharges the hydraulic oil to the closed tank 21b. Hydraulic oil whose temperature has not risen is supplied to the communication path 38b of the first closed circuit 17 (the suction side of the hydraulic motor 15). As a result, the hydraulic oil in the first closed circuit 17 can be cooled with a small flow rate, and the flow rate can be maintained. As a result, the discharge amount of the charge pressure source 19 (the electric motor 52, the charge pump 51, etc.) is suppressed, and the charge pressure source 19 can be made smaller.

In addition, since the closed tanks 21a and 21b are provided, it is possible to make a compact configuration without requiring an air gap compared to an open-structured tank, thereby maximizing the amount of hydraulic oil to be stored. Furthermore, since the closed tanks 21a and 21b are provided, even if leakage occurs from the piping, the leakage is so slight that the pressure drops, and much of the hydraulic oil in the closed tanks 21a and 21b does not leak out. do not have. Since the first closed circuit 17 is cooled by the hydraulic oil in the closed tanks 21a and 21b, only a small amount of hydraulic oil is required to be stored in the storage tank 22. can be made smaller. As a result, the size and weight of the hydraulic drive unit 10 can be reduced, and the size and weight of the water gate opening/closing device 1 as a whole can be reduced.

Furthermore, in the water gate opening and closing device 1 according to the present embodiment, the dead weight lowering circuit 20 communicated with the first closed circuit 17 and the sealed tanks 21a and 21b, and the flow control valve 85 provided in the dead weight lowering circuit 20. , is equipped with As a result, the flow rate of the hydraulic oil flowing through the dead weight lowering circuit 20 is throttled and restricted by the flow control valve 85, so that the door body 3 can be stably lowered at an appropriate dead weight lowering speed.

Further, when the weight of the door body 3 is lowered, the hydraulic oil flowing along the weight lowering circuit 20 flows into the closed tanks 21a and 21b, thereby increasing the temperature of the closed tanks 21a and 21b. Hydraulic oil that is not present flows and circulates in a second closed circuit 18 that includes a portion of the first closed circuit 17 . As a result, the second closed circuit 18 including a part of the first closed circuit 17 can be cooled by the hydraulic fluid that is stored in the sealed tanks 21a and 21b and whose temperature has not risen. In addition, when the door body 3 is lowered by its own weight, the charge pressure source 19 applies an amount equal to or greater than the amount of hydraulic oil that has leaked from the hydraulic motor 15 or the like, so that the suction side of the hydraulic motor 15 (the communication path of the first closed circuit 17 38b) can be applied with a pressure (charge pressure) above a certain level to prevent the occurrence of cavitation.

Furthermore, the water gate opening/closing device 1 according to the present embodiment includes a hydraulic drive unit 10. The hydraulic drive unit 10 includes a hydraulic motor 15, a speed reducer 7, hydraulic pressure sources 16a and 16b, and first and second closing valves. Circuits 17 and 18, closed tanks 21a and 21b, charge pressure source 19, and storage tank 22 are integrated. As a result, a sufficient cooling effect can be obtained for the hydraulic oil circulating through the first and second closed circuits 17 and 18, the charge pressure source 19, the reservoir tank 22, etc. can be made smaller, and the hydraulic drive unit 10 as a whole can be reduced in size. It can be made smaller. As a result, it is possible to reduce the size of the entire water gate opening/closing device 1 on which the hydraulic drive unit is mounted, and to make the installation space compact.

In addition, although the water gate opening/closing device 1 according to the present embodiment described above employs a wire rope type, other elevating means such as a chain type or a rack type may be employed.

Further, although hydraulic pressure is used in the water gate opening/closing device 1 according to the present embodiment described above, other hydraulic pressure may be used. Furthermore, in this embodiment, the hydraulic drive unit 10 described above is mounted on the water gate opening/closing device 1, but it may be mounted on other devices.

Reference Signs List 1 sluice gate opening/closing device, 3 door body (to-be-moved body), 10 hydraulic drive unit (hydraulic pressure drive unit), 15 hydraulic motor (hydraulic pressure motor), 16a, 16b hydraulic source (hydraulic pressure source), 17 first closed circuit (closed circuit), 18 second closed circuit, 19 charge pressure source, 20 self-weight lowering circuit, 21a, 21b closed tank, 22 storage tank, 23 fail-safe means, 24 emergency door liftable means, 30 brake mechanism, 33a, 33b pumps 34a, 34b electric motors 85 flow control valves 95a, 95b emergency cutoff valves 100a, 100b check valves 108 electromagnetic switching valves 110 brake circuits

Claims (9)

A water gate opening and closing device for opening and closing a water gate,
a hydraulic motor connected to a door that opens and closes the water gate and raises and lowers the door by hydraulic pressure;
a liquid pressure source including a pump and an electric motor for driving the pump, and capable of controlling the discharge amount and the discharge direction;
a closed circuit communicating between the hydraulic motor and the pump, in which hydraulic fluid circulates;
a fail-safe means for restricting the door body from falling under its own weight when the hydraulic pressure source is inoperable and the rotation shaft of the hydraulic motor is released from restraint;
The fail-safe means is provided in the closed circuit,
A flood gate opening/closing device comprising an emergency cutoff valve that closes when a flow rate of hydraulic fluid passing through the water gate per unit time exceeds a predetermined flow rate to cut off the flow of the hydraulic fluid in the closed circuit. A closed tank communicated across the closed circuit;
a charge pressure source for supplying the hydraulic fluid in the storage tank to the closed tank;
The water gate opening and closing device according to claim 1, characterized by comprising: a dead weight lowering circuit that communicates with the closed circuit and the closed tank;
a flow control valve provided in the dead weight lowering circuit;
The water gate opening and closing device according to claim 1 or 2, characterized by comprising: A water gate opening and closing device for opening and closing a water gate,
a hydraulic motor connected to a door that opens and closes the water gate and raises and lowers the door by hydraulic pressure;
a liquid pressure source including a pump and an electric motor for driving the pump, and capable of controlling the discharge amount and the discharge direction;
a closed circuit communicating between the hydraulic motor and the pump, in which hydraulic fluid circulates;
a charge pressure source that supplies the hydraulic fluid in the reservoir tank to the closed circuit and supplies the hydraulic fluid in the reservoir tank to a brake mechanism to release the rotary shaft of the hydraulic motor;
an emergency door elevation means that enables the door to be raised and lowered by releasing the restraint of the rotating shaft of the hydraulic motor by the brake mechanism when the charge pressure source becomes inoperable;
A sluice gate opening and closing device comprising: The emergency door liftable means is provided in the closed circuit,
a check valve that returns the hydraulic fluid in the storage tank to the closed circuit;
an electromagnetic switching valve that is opened by an operator's operation to supply the hydraulic fluid in the closed circuit to the brake mechanism when the charge pressure source becomes inoperable;
The water gate opening and closing device according to claim 4, characterized by comprising: A closed tank communicated across the closed circuit;
a dead weight lowering circuit that communicates with the closed circuit and the closed tank;
a flow control valve provided in the dead weight lowering circuit;
The water gate opening and closing device according to claim 4 or 5, characterized by comprising: A brake circuit is provided in the closed circuit and releases the hydraulic pressure from the high pressure side of the closed circuit to the low pressure side when the hydraulic pressure in the closed circuit exceeds a predetermined pressure. A water gate operator according to any one of the above. A hydraulic drive unit for moving a body to be moved,
a hydraulic motor for moving the object to be moved by hydraulic pressure;
a speed reducer coupled to the hydraulic motor;
a liquid pressure source including a pump and an electric motor for driving the pump, and capable of controlling the discharge amount and the discharge direction;
a closed circuit communicating between the hydraulic motor and the pump, in which hydraulic fluid circulates;
A closed tank communicated across the closed circuit;
a charge pressure source that supplies the hydraulic fluid in the storage tank to the closed tank and supplies the hydraulic fluid in the storage tank to a brake mechanism to release the rotary shaft of the hydraulic motor;
A hydraulic drive unit comprising: 8. The hydraulic motor, the speed reducer, the hydraulic pressure source, the closed circuit, the closed tank, the charge pressure source, and the storage tank are integrated. Hydraulic drive unit according to.

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