Rotary valve drive device

Abstract

To provide a rotary valve drive device capable of stopping a valve body of a rotary valve in an open state and a closed state, and capable of effectively suppressing temperature rise of oil boosted in a hydraulic oscillation vane motor.SOLUTION: A rotary valve drive device 20 comprises: a lower base 30 fixed to a rotary valve 10; a fixed position rotary plate 40 arranged above the lower base 30 and having a valve rod 11 of the rotary valve penetrated and fixed thereto; one or two locking members 50 including a cylindrical pin 51 inserted from a through hole provided in the fixed position rotary plate 40; an upper base 60 arranged above the fixed position rotary plate 40, and fixed to the lower base 30; and a hydraulic oscillation vane motor 70 that is arranged above the upper base 60, and applies boosted oil to a vane to rotate an output shaft connected to the valve rod 11 of the rotary valve.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotary valve drive device using a hydraulic swing vane motor.

Background Art

[0002] A rotary valve having a diameter of about 500 mm to 1500 mm (hereinafter referred to as a "large-diameter rotary valve") is used, for example, as a stop valve for a water pressure pipe that guides water to a hydroelectric power plant. In order to carry a large amount of water to a waterwheel for hydroelectric power generation, the valve body of the rotary valve is continuously in an open state or a closed state. For example, in the case of a stop valve for a water pressure pipe, in the closed state, a closing force required to block a large amount of water, a fluid force generated from the fluid flow in the operation from the closed state to the open state, and all the forces including a restraining force for holding the position of the valve body of the rotary valve in the open state are required. A driving device that can overcome all these forces is required.

[0003] Since the closing force in the closed state, the fluid force from the closed state to the open state, and the restraining force in the open state are all received by the valve shaft of the rotary valve, a large-diameter rotary valve drive device is required to be able to generate a huge thrust for rotating the valve body of the rotary valve.

[0004] When a large amount of water passes through the valve body of a large-diameter rotary valve, the large amount of water always passes while applying impact and vibration to the valve body of the rotary valve. The impact and vibration will continuously vibrate the rotary valve drive device.

[0005] The impact and vibration generated when a large amount of water passes not only damage the electronic components constituting the rotary valve drive device but also lead to wear, cracks, and breakage of the mechanical components constituting the rotary valve drive device, which may also cause the opening and closing operation of the rotary valve to stop. Therefore, in particular, a large-diameter rotary valve drive device is required to be simple and compact, and it is also necessary to get as close as possible to the valve rod of the rotary valve.

[0006] Currently, electric motor-driven systems and hydraulic piston cylinder-driven systems are the mainstream for large-diameter rotary valve drive systems.

[0007] Electric motor drive systems require a reduction gear, which inevitably leads to increased size and weight. Furthermore, because the electric motor must be installed after the reduction gear, it is far from the valve stem of the rotary valve, which exacerbates the shock and vibration caused by the passage of large volumes of water.

[0008] Hydraulic piston cylinder drive systems require a rotating gear to convert the horizontal movement of the piston cylinder into rotational thrust for the rotary valve. This inevitably leads to larger size and heavier weight. Furthermore, because the horizontally moving hydraulic piston cylinder needs to travel a certain horizontal distance to generate rotation for the rotating gear, the horizontal movement distance is inevitably long, and the cylinder and rod also become longer. As a result, the hydraulic piston cylinder is farther away from the valve body of the rotary valve, which exacerbates the shock and vibration that occur when a large volume of water passes through it.

[0009] In contrast, a drive system using a hydraulic oscillating vane motor has a simple structure in which the force proportional to the pressure-receiving area of ​​the vane is directly transmitted, and it can be directly connected to the output shaft of the vane motor. This reduces the failure rate and eliminates the need for auxiliary equipment such as speed reducers and amplifiers, offering advantages in terms of miniaturization. Furthermore, because it can be directly installed on the valve stem of the rotary valve, which is very close to the shock and vibration source generated when a large amount of water passes through, the impact of a large amount of water passing through the valve body of the rotary valve is minimal. Additionally, there is no impact on metal surfaces due to the clearance characteristic of hydraulic oscillating vane motors. For these reasons, it can be considered more suitable than electric motor drive systems and hydraulic piston cylinder drive systems for large-diameter rotary valve drive systems.

[0010] On the other hand, in large-diameter rotary valve drive systems, it is essential to keep the rotary valve stationary in both the open and closed positions. In electric motor drive systems, this can be achieved by changing the axial direction using a reduction gear, and in hydraulic piston cylinder drive systems, it can be achieved by using a piston seal ring. However, in drive systems using hydraulic oscillating vane motors, the sealing method used in hydraulic piston cylinder drive systems is insufficient, and oil constantly leaks, making it difficult to keep the rotary valve stationary in both the open and closed positions.

[0011] For the reasons described above, hydraulic oscillating vane motors have been limited to being installed on the output side of the power steering system, as shown in Patent Document 1, for example. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Japanese Patent Application Publication No. 62-46792 [Overview of the project] [Problems that the invention aims to solve]

[0013] A hydraulic oscillating vane motor is characterized by its ability to be directly connected to the valve stem of a rotary valve. However, it is difficult to create a seal that reduces rotational contact, and conventional ring-shaped seal structures cannot be used. Therefore, oil leakage is currently addressed by minimizing the clearance (gap) between the vane and the housing. If pressurized oil is continuously supplied to push the vane, the hydraulic oscillating vane motor will continue to leak oil due to the clearance between the vane and the housing, even if the supply hydraulic pressure is sealed, as in a hydraulic piston cylinder drive system.

[0014] When a hydraulic oscillating vane motor is used in a large-diameter rotary valve drive, the output shaft of the hydraulic oscillating vane motor and the valve stem of the rotary valve are directly connected. As a result, the output shaft of the hydraulic oscillating vane motor is subjected to the force of the valve stem of the rotary valve, requiring a continuous supply of pressurized oil to push the vanes into the hydraulic oscillating vane motor. However, if pressurized oil is continuously supplied to the hydraulic oscillating vane motor, leakage of the pressurized oil will continue. Consequently, the temperature of the oil inside the hydraulic oscillating vane motor will rise, the viscosity of the oil will change, and the oil pressure will saturate. After that, the output shaft of the hydraulic oscillating vane motor, which was previously stopped, will start to move. Then, as the hydraulic pressure weakens, it will succumb to the fluid pressure passing through the valve body of the rotary valve, and the output shaft of the hydraulic oscillating vane motor will rotate in any direction, which is an undesirable phenomenon.

[0015] The rise in oil temperature within a hydraulic oscillating vane motor can also cause cavitation erosion during depressurization (opening of the leak), leading to equipment damage and, in the worst case, complete shutdown.

[0016] The object of the present invention is to provide a rotary valve drive device that can hold the valve body of the rotary valve still in both the open and closed states, and can effectively suppress the temperature rise of the oil in a hydraulic oscillating vane motor. [Means for solving the problem]

[0017] In order to solve the aforementioned problems, the inventors conducted extensive research and found that a rotary valve drive device comprising a position-fixing rotating plate and a locking member including a cylindrical pin for fixing the position-fixing rotating plate achieves the above objective, leading to the present invention.

[0018] That is, the rotary valve driving device of the present invention includes a lower pedestal fixed to the rotary valve, a position-fixed rotary plate disposed above the lower pedestal and fixedly penetrating the valve rod of the rotary valve, one or two locking members including a cylindrical pin inserted through a through hole provided in the position-fixed rotary plate, an upper pedestal disposed above the position-fixed rotary plate and fixed to the lower pedestal, and a hydraulic swing vane motor disposed above the upper pedestal, applying pressurized oil to the vane, and rotating an output shaft connected to the valve rod of the rotary valve.

[0019] In the gripping device of the present invention, it is preferable that the above-described rotary valve driving device is composed of two locking members, and it is preferable that a recess for fitting with the tip of the cylindrical pin of the above-described locking member is provided on the outer peripheral portion of the above-described lower pedestal.

Advantages of the Invention

[0020] By using the rotary valve driving device of the present invention, not only can the installation area be minimized, but also the valve body of the rotary valve can be stationary in the open state and the closed state. Therefore, when a large amount of water passes through or collides with the valve body of the rotary valve, the impact and vibration generated can be effectively suppressed, not only reducing the damage factors to mechanical parts, but also being able to control the power and suppress the temperature rise of the oil to the limit.

Brief Description of the Drawings

[0021] [Figure 1] It is a diagram showing an example of the usage state of the rotary valve driving device of the present invention. [Figure 2] It is a diagram showing another example of the usage state of the rotary valve driving device of the present invention. [Figure 3] It is a diagram showing an example of the lower pedestal used in the rotary valve driving device of the present invention. [Figure 4] It is a diagram showing an example of the position-fixed rotary plate used in the rotary valve driving device of the present invention. [Figure 5] It is a diagram showing another example of the position-fixed rotary plate used in the rotary valve driving device of the present invention. [Figure 6]It is a figure showing an example of a state in which a lower pedestal and a position-fixed rotating plate used in the rotary valve drive device of the present invention are combined. [Figure 7] It is a figure showing an example of a lock member used in the rotary valve drive device of the present invention. [Figure 8] It is a cross-sectional view showing an example of the moving state of the lock member used in the rotary valve drive device of the present invention. [Figure 9] It is a figure showing an example of an upper pedestal used in the rotary valve drive device of the present invention. [Figure 10] It is a figure showing an example of a hydraulic oscillating vane motor used in the rotary valve drive device of the present invention. [Figure 11] It is a cross-sectional view taken along the line A-A showing an example of a hydraulic oscillating vane motor used in the rotary valve drive device of the present invention.

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the rotary valve drive device of the present invention will be described. Note that the present invention is not limited to the following embodiments.

[0023] As shown in FIGS. 1 and 2, the rotary valve drive device 20 includes a lower pedestal 30, a position-fixed rotating plate 40, a lock member 50, an upper pedestal 60, and a hydraulic oscillating vane motor 70.

[0024] The lower pedestal 30 is installed above the rotary valve 10 and fixed to the main body of the rotary valve 10. For example, as shown in FIG. 3, bolt holes 34, 34, 34, 34, 34, 34, 34, 34 are provided in the lower pedestal 30, and the lower pedestal 30 is fixed to the main body of the rotary valve 10 by bolting.

[0025] As shown in FIG. 3, fixing column recesses 35, 35, 35, 35 to which fixing columns 62, 62, 62, 62 can be attached are provided at the four corners of the lower pedestal 30, and the lower pedestal 30 is fixed to the upper pedestal 60 via the fixing columns 62, 62, 62, 62. A through hole 31 for the valve rod of the rotary valve is provided at the center of the lower pedestal 30, through which the valve rod 11 of the rotary valve passes, as shown in FIG. 3.

[0026] As shown in Figure 8, it is preferable that the outer circumference of the lower base 30 is provided with a pin recess 33 that engages with the tip 51a of the cylindrical pin 51 of the locking member 50, in order to more effectively prevent the valve body 12 of the rotary valve from swinging. If there is one locking member, two pin recesses are provided on the outer circumference of the lower base, and if there are two locking members, three pin recesses are provided on the outer circumference of the lower base.

[0027] As shown in Figure 3, the lower base 30 may be provided with a rotation-stopping projection 32 to prevent the position-fixing rotating plate 40 from rotating too far.

[0028] The position-fixing rotating plate 40 is positioned above the lower base 30 and rotates simultaneously with the valve stem 11 of the rotary valve in the same direction.

[0029] As shown in Figures 4 and 5, the center of the fixed-position rotating plate 40 is provided with a valve stem through-hole 41 through which the valve stem 11 of the rotary valve passes, and a key through-hole 42 into which a rectangular prism can be inserted. A rectangular prism member 45, which functions as a wedge, is inserted into the key through-hole 42, and the valve stem 11 of the rotary valve is fixed through to the fixed-position rotating plate 40.

[0030] Near the outer circumference of the position-fixing rotating plate 40, there are through-holes 43 for the cylindrical pin 51 of the locking member 50. As shown in Figure 4, there are two through-holes 43 (one for the open state pin and one for the closed state pin) when there is one locking member 50, and as shown in Figure 5, there are three through-holes 43 (one for the open state pin, one for a combined pin that serves both as the open state pin and the closed state pin, and one for the closed state pin) when there are two locking members 50, and the cylindrical pin 51 passes through them as desired.

[0031] As shown in Figures 4, 5, and 6, a protruding portion 44 may be provided on the outer circumference of the position-fixing rotating plate 40, in conjunction with the rotation-stopping projection 32 of the lower base 30, to prevent the position-fixing rotating plate 40 from rotating too far.

[0032] The locking member 50 prevents the valve body 12 of the rotary valve from swinging. In this invention, the locking member 50 consists of one or two members. If there are three or more locking members, the rotary valve drive device will not only become larger, but the control of the cylindrical pin will also become too complex. Furthermore, in this invention, it is preferable that the locking member 50 consists of two members. This is preferable because two locking members can fix the valve body of the rotary valve more reliably and firmly than one locking member.

[0033] The locking member 50 is composed of, for example, a cylindrical pin 51 that can move up and down, a hydraulic piston cylinder 52 that provides thrust to move the cylindrical pin 51, a connecting member 53 that connects the cylindrical pin 51 and the hydraulic piston cylinder 52, a piston cylinder mounting plate 54 to which the hydraulic piston cylinder 52 is attached, and a hexagonal support column 55 that supports the piston cylinder mounting plate 54.

[0034] The hydraulic piston cylinder 52 lowers or raises the cylindrical pin 51 as appropriate based on commands from the control device 81.

[0035] Based on a command from the control device 81, when the hydraulic piston cylinder 52 rises, the cylindrical pin 51 rises accordingly and is pulled out of the pin through hole 43 of the fixed-position rotating plate 40, after which the cylindrical pin 51 completely escapes from the pin through hole 43 of the fixed-position rotating plate 40. Once the cylindrical pin 51 has completely escaped from the pin through hole 43 of the fixed-position rotating plate 40, the fixed-position rotating plate 40 becomes rotatable, and as the output shaft 72 of the hydraulic oscillating vane motor 70 rotates, the fixed-position rotating plate 40 rotates in the same direction, and at the same time, the valve shaft 11 of the rotary valve also rotates in the same direction.

[0036] Based on a command from the control device 81, when the hydraulic piston cylinder 52 descends, the cylindrical pin 51 descends accordingly, and the cylindrical pin 51 penetrates the pin through hole 43 of the position-fixing rotating plate 40, and the tip 51a of the cylindrical pin reaches the vicinity of the recess in the lower base 30 (Figure 1) or the recess in the lower base 30 (Figure 8). When the tip 51a of the cylindrical pin reaches the vicinity of the recess in the lower base 30 or the recess in the lower base 30, the position-fixing rotating plate 40, the valve stem 11 of the rotary valve, and the output shaft 72 of the hydraulic oscillating vane motor 70 become fixed, and the oscillation of the valve body 12 of the rotary valve and the oscillation of the rotation shaft of the hydraulic oscillating vane motor 70 are suppressed.

[0037] When the cylindrical pin 51 passes through the pin through-hole 43 of the position-fixing rotating plate 40, the oscillation of the valve body 12 of the rotary valve is suppressed. As shown in Figure 8, when the tip 51a of the cylindrical pin engages with the pin recess 33 of the lower base 30, the oscillation of the valve body 12 of the rotary valve is suppressed more effectively.

[0038] The upper base 60 supports the locking member 50 and the hydraulic oscillating vane motor 70. As shown in Figure 9, fixing posts 62, 62, 62, 62 are attached to the four corners of the upper base 60 and fixed to the lower base 30. As shown in Figure 9, a valve stem through-hole 61 is provided in the center of the upper base 60, through which the valve stem 11 of the rotary valve passes. At the ends of the upper base 60, for example, as shown in Figure 9, a cylindrical pin through-hole 63 and hexagonal support post through-holes 64, 64, 64, 64 are provided, and the locking member 50 is positioned so that it protrudes upwards.

[0039] The hydraulic oscillating vane motor 70 is responsible for rotating the valve stem 11 of the rotary valve. The hydraulic oscillating vane motor 70 consists of a housing 71, an output shaft (rotating shaft) 72, vanes 73 inserted into the output shaft 72, and oil supply outlets a 74 and b 75 that supply pressurized oil to rotate the vanes 73.

[0040] The pressurized oil supplied from the hydraulic generator 82 is delivered via an oil switching valve (not shown) to either the oil supply / discharge port a74 or the oil supply / discharge port b75 of the hydraulic oscillating vane motor 70, if desired.

[0041] When pressurized oil is supplied from the oil supply / discharge port a74, it hits the right side of the vane 73, generating a large torque, which causes the vane 73 to rotate to the left. Consequently, the output shaft 72 of the hydraulic oscillating vane motor rotates to the left, and the valve stem 11 of the rotary valve connected to the output shaft 72 of the hydraulic oscillating vane motor rotates to the left, causing the valve body 12 of the rotary valve to rotate in the direction of opening.

[0042] When pressurized oil is supplied from the oil supply outlet b75, it hits the left side of the vane 73, generating a large torque, which causes the vane 73 to rotate to the right. Consequently, the output shaft 72 of the hydraulic oscillating vane motor rotates to the right, and the valve stem 11 of the rotary valve connected to the output shaft 72 of the hydraulic oscillating vane motor rotates to the right, causing the valve body 12 of the rotary valve to rotate in the direction of closing.

[0043] The output shaft 72 of the hydraulic oscillating vane motor is connected to the valve stem 11 of the rotary valve by a shaft coupling 76. The output shaft 72 of the hydraulic oscillating vane motor and the valve stem 11 of the rotary valve are provided with key recesses into which a rectangular prism that functions as a wedge can be inserted, and the insertion of the rectangular prism member strengthens the connection of the shaft coupling 76.

[0044] The position of the valve body 12 of the rotary valve is detected by a rotary valve position detector 77. The rotary valve position detector 77 is mounted on the rotation axis of a hydraulic oscillating vane motor 70 corresponding to the rotation direction of the valve body 12 of the rotary valve, for example, as shown in Figures 1 and 2. Under certain conditions, the rotary valve position detector 77 transmits the position information of the valve body 12 of the rotary valve to a control device 81.

[0045] In addition to the above, the control device 81 controls the positions of the hydraulic generator 82, the oil switching valve (not shown), and the locking member 50 based on an open signal sent from a remote operating device (not shown) to open the valve body 12 of the rotary valve to a predetermined angle and a closed signal to close the valve body 12 of the rotary valve. It also controls the positions of the hydraulic generator 82, the oil switching valve (not shown), and the cylindrical pin 51 of the locking member based on the position information of the valve body 12 of the rotary valve sent from the rotary valve position detector 77.

[0046] The following is an example of the operation of a rotary valve, from a closed state to an open state where the valve body is opened to a predetermined angle.

[0047] Upon receiving an open signal indicating that the valve body of the rotary valve should be opened to a predetermined angle, the control device transmits a start signal to activate the hydraulic power generator, sends an oil supply signal to switch the oil switching valve in order to supply pressurized oil to the hydraulic oscillating vane motor, and transmits a through-hole withdrawal command signal to the locking member in order to withdraw the cylindrical pin from the through-hole for the closed state pin of the position-fixing rotating plate.

[0048] Upon receiving a start signal from the control unit, the hydraulic generator begins to start from a stationary state, and pressurized oil is sent to the oil switching valve. However, upon receiving an oil supply signal from the control unit, the oil switching valve switches the valve to supply the pressurized oil to the hydraulic oscillating vane motor. As a result, the pressurized oil from the hydraulic generator is supplied to the hydraulic oscillating vane motor, and the rotation of the hydraulic oscillating vane motor begins.

[0049] Upon receiving a through-hole withdrawal command signal from the control device, the locking member moves the cylindrical pin in the direction of withdrawing it from the through-hole for the closed-state pin of the fixed-position rotating plate, thereby making the fixed-position rotating plate rotatable. When the hydraulic oscillating vane motor starts rotating, the valve stem of the rotary valve connected to the output shaft of the hydraulic oscillating vane motor rotates in the same direction, and consequently, the valve body of the rotary valve rotates in the direction of opening the valve.

[0050] When the rotary valve rotates to a predetermined angle, the rotary valve position detector detects that it has rotated to the predetermined angle and transmits a rotation stop signal to the control device.

[0051] Upon receiving the rotation stop signal from the rotary valve position detector, the control device transmits a stop signal to stop the hydraulic power generator, as well as an oil stop signal to stop supplying pressurized oil to the hydraulic oscillating vane motor. It also transmits a through-hole push command signal to the locking member in order to push the locking member into the through-hole for the open state pin of the position-fixing rotary plate.

[0052] Upon receiving a stop signal from the control unit, the hydraulic generator stops starting up, and upon receiving an oil stop signal from the control unit, the oil switching valve switches to a position where it does not supply pressurized oil to the hydraulic oscillating vane motor. As a result, the pressurized oil from the hydraulic generator is not supplied to the hydraulic oscillating vane motor, and the rotation of the hydraulic oscillating vane motor stops.

[0053] Upon receiving a through-hole push command signal from the control device, the locking member moves the cylindrical pin in a direction that pushes it into the through-hole for the open-state pin of the position-fixing rotating plate, thereby rendering the position-fixing rotating plate immobile.

[0054] When the fixed-position rotating plate becomes immobile, the valve body of the rotary valve is maintained and fixed in an open state at a predetermined angle, thereby suppressing the shock and vibration that occur when a large amount of water passes through the valve body of the rotary valve. When the rotation of the hydraulic oscillating vane motor stops, the temperature rise of the oil inside the hydraulic oscillating vane motor is suppressed.

[0055] Next, an example of the operation of a rotary valve from the open state, where the valve body is open to a predetermined angle, to the closed state is shown below.

[0056] Upon receiving a closing signal to close the valve body of the rotary valve, the control device transmits a start signal to activate the hydraulic power generator, transmits an oil supply signal to switch the oil switching valve in order to supply pressurized oil to the hydraulic oscillating vane motor, and transmits a through-hole withdrawal command signal to the locking member to withdraw the cylindrical pin from the through-hole for the open-state pin of the position-fixing rotating plate.

[0057] Upon receiving a start signal from the control unit, the hydraulic generator begins to start from a stationary state, and pressurized oil is sent to the oil switching valve. However, upon receiving an oil supply signal from the control unit, the oil switching valve switches the valve to supply the pressurized oil to the hydraulic oscillating vane motor. As a result, the pressurized oil from the hydraulic generator is supplied to the hydraulic oscillating vane motor, causing the hydraulic oscillating vane motor to rotate in the opposite direction to the one described above.

[0058] Upon receiving a through-hole withdrawal command signal from the control device, the locking member moves the cylindrical pin in the direction of withdrawing it from the through-hole for the open-state pin of the fixed-position rotating plate, thereby making the fixed-position rotating plate rotatable. When the hydraulic oscillating vane motor starts rotating, the valve stem of the rotary valve connected to the output shaft of the hydraulic oscillating vane motor rotates in the same direction, and consequently, the valve body of the rotary valve rotates in the direction of closing the valve.

[0059] When the valve body of the rotary valve closes, the rotary valve position detector detects that the valve body of the rotary valve has closed and transmits a rotation stop signal to the control device.

[0060] Upon receiving a rotation stop signal from the rotary valve position detector, the control device transmits a through-hole push command signal to the locking member instructing it to push the cylindrical pin into the through-hole for the closed state pin of the position-fixing rotary plate.

[0061] Upon receiving a through-hole push command signal from the control device, the locking member moves the cylindrical pin in a direction that pushes it into the through-hole for the closed state pin of the position-fixing rotating plate, thereby rendering the position-fixing rotating plate immobile.

[0062] If the fixed-position rotating plate becomes unable to rotate, the control device sends a stop signal to shut down the hydraulic power generator and also sends an oil stop signal to switch the oil switching valve to stop supplying pressurized oil to the hydraulic oscillating vane motor.

[0063] Upon receiving a stop signal from the control device, the hydraulic generator stops starting up, and upon receiving an oil stop signal from the control device, the oil switching valve switches the valve in a direction that does not supply pressurized oil to the hydraulic oscillating vane motor. As a result, the pressurized oil from the hydraulic generator is not supplied to the hydraulic oscillating vane motor, and the hydraulic oscillating vane motor stops rotating.

[0064] When the fixed-position rotating plate becomes immobile, the rotary valve is kept closed, thereby suppressing the shock and vibration that would occur if a large amount of water were to collide with the valve body of the rotary valve. When the rotation of the hydraulic oscillating vane motor stops, the temperature rise of the oil inside the hydraulic oscillating vane motor is suppressed. [Explanation of Symbols]

[0065] 10 Rotary valves 11. Valve stem of a rotary valve 12. Valve body of a rotary valve 20. Rotary valve drive device 30 Lower pedestal 31 Through hole for valve stem 32. Anti-rotation protrusions 33 Pin recess 34 bolt holes 35 Recess for fixed support post 40 Position-fixed rotating plate 41 Through hole for valve stem 42 Through-holes for keys 43 Through-hole for pins 44 Protruding part 45 square column member 50 Locking member 51 Cylindrical pins 51a Tip of cylindrical pin 52 Hydraulic Piston Cylinder 53 Connecting Member 54 Cylinder mounting plate 55 Hexagonal support 60 Upper base 61 Through hole for valve stem 62 Fixed post 63 Through-hole for cylindrical pin 64 Through hole for hexagonal column 70 Hydraulic oscillating vane motor 71 cabinets 72 Output shaft (rotation shaft) 73 Bane 74 Oil supply outlet a 75 Oil supply outlet b 76 Shaft joint 77 Rotary valve position detector 81 Control device 82 Hydraulic generator

Claims

1. A rotary valve drive device comprising: a lower base fixed to a rotary valve; a position-fixing rotating plate positioned above the lower base and through which the valve stem of the rotary valve is fixed; one or two locking members including a cylindrical pin inserted through a through hole provided in the position-fixing rotating plate; an upper base positioned above the position-fixing rotating plate and fixed to the lower base; and a hydraulic oscillating vane motor positioned above the upper base, which applies pressurized oil to the vanes to rotate an output shaft connected to the valve stem of the rotary valve.

2. The rotary valve drive device according to claim 1, characterized in that the rotary valve drive device is composed of two locking members.

3. The rotary valve drive device according to claim 1 or 2, characterized in that the outer circumference of the lower base is provided with a recess that engages with the tip of the cylindrical pin of the locking member.

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