JPH07224417A - Sluice opening/shutting device - Google Patents

Abstract

PURPOSE:To eliminate necessity for changeover operations when opening and shutting of a sluice is changed over from motor-driven into manual operation, or vice versa. CONSTITUTION:On the way of a drive force transmission path for opening and shutting a sluice, a planetary gearing speed reduction machine 3 is installed which is composed of a sun gear 3a in flat form, a planet gear 3b in flat form which orbits round the sun gear 3a while meshing therewith in one plane. and an internal gear 4 which meshes with the planet gear orbiting 3b. The sun gear shaft 3c of this speed reduction machine 3 is coupled in follower mode with the drive shaft of a motor 1 through a 'motor side' worm gear 7 capable of self-locking, and the internal gear 4 is coupled in follower mode with the drive shaft of a manually operating handle 2 through a 'manual side' worm gear 5 capable of self-locking. The output shaft 10 transmitting the drive force to the opening/shutting mechanism of the sluice is put identical to the axis of the sun gear shaft 3c and arranged in uncoupling condition with the sun gear 3a, and one end of a connecting rod 10a is rotatably coupled with the rotational center of the planet gear 3b, and the other end of the rod 10a is used as output shaft 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sluice door opening / closing device for electrically or manually opening and closing a sluice gate installed in a waterway of a river or the like, and more particularly to opening / closing the sluice door electrically or manually or manually. The present invention relates to a sluice door opening / closing device that eliminates the need for the switching operation when switching to.

[0002]

2. Description of the Related Art Conventionally, the opening and closing of a sluice door installed in a waterway such as a river is usually performed by using the driving force of an electric motor. However, when the electric motor fails, the sluice gate is opened and closed. It is configured so that it can be opened and closed manually, and the opening / closing device of the sluice door is equipped with a manual handle that is manually operated together with an electric motor.

An example of such a door opening / closing device for a water gate equipped with both an electric motor and a manual handle is shown in FIG. JP-A-3-23580 as shown
8 "Sluice gate opening and closing device" etc. have been applied. These "door opening and closing devices at the floodgate" (Actual Kaihei 2-13992)
8), "Water gate opening / closing device" (Japanese Patent Laid-Open No. 3-235808) uses a planetary gear reducer and a differential gear mechanism in the middle of the drive force transmission path for opening and closing the water gate.

Among them, the "Opening / closing device for a door at a water gate" of Kaikaihei 2-139928 "provides a planetary gear reducer in a machine box, and an electromagnetic clutch and a negative operation electromagnetic brake on a sun gear drive shaft of the reducer. A drive motor is connected through a self-locking device, and a reduction gear fixed to the planetary gear shaft in the revolving direction is provided, and a pinion connected to the reduction gear meshes with the door body lifting rack and meshes with the planetary gear. The internal gear is provided with a worm gear fixed to the internal gear in the rotational direction, the worm is meshed with the worm gear, and a manual handle is provided on the rotary shaft of the worm.

Further, in Japanese Patent Laid-Open No. 3-235808, "Water gate opening / closing device", "Gear is fixed to each of two side gears of a differential gear mechanism, and one of the gears is provided with an output shaft of a rotary drive unit via the gear mechanism. And a screw brake and a centrifugal brake device with a clutch mechanism attached to the other gear via a gear mechanism, the clutch mechanism is provided with an automatic return type self-weight lowering lever, and the gear mechanism is attached to the screw brake. The manual handle is connected through ... ".

[0006]

However, in the "door opening / closing device at the water gate" of the above-mentioned Kaihei 2-139928 shown in FIG. 4, an electromagnetic clutch is attached to the sun gear drive shaft 52 of the planetary gear reducer 51. The drive motor 56 is connected via a self-locking device 55 composed of 53 and a negative operation electromagnetic brake 54.
5 is composed of an electrically operated electromagnetic clutch 53 and a negatively operated electromagnetic brake 54, the self-locking device 5
5 requires an electric wiring and a control mechanism for electrically actuating the electric wiring, which causes a problem that the structure becomes complicated accordingly.

Further, the above-mentioned Japanese Patent Laid-Open No. 3-235 shown in FIG.
In the 808 “water gate opening and closing device”, the side gear 6
The gears 63 and 64 mesh with each other at a right angle to the gears 1, 62, and the gears 63 and 64 are pushed toward the shaft due to the rotational force. There is a problem that the friction loss of the power that occurs in is large.

The present invention was devised in view of the above problems, and its main purpose is to open and close the sluice gate by switching from electric operation to manual operation or manual operation to electric operation. , The switching operation is unnecessary, and the other purpose is to eliminate the need for an electric control mechanism for self-locking, reduce friction loss, and suspend the door. It is an object of the present invention to provide a sluice gate opening / closing device that can efficiently arrange each device around a rack bar to be lowered to reduce the size and installation space.

[0009]

In order to achieve the above object, the present invention provides a sun spur gear and a periphery of the sun spur gear which are meshed in the same plane in the middle of a drive force transmission path for opening and closing a water gate. While arranging a planetary gear reducer consisting of a revolving planetary spur gear and an internal gear that meshes with the revolving planetary spur gear, the sun spur gear shaft of the planetary gear reducer can be self-locked to the drive shaft of the electric motor. Driven worm gear to be driven, and the internal gear is driven to the drive shaft of the manual handle via a self-lockable manual worm gear.
The output shaft that transmits the driving force to the opening / closing mechanism of the sluice gate is aligned with the axis of the sun spur gear and is not connected to the sun spur gear, and one end of the rod is connected to the rotation center of the planetary spur gear. It is rotatably connected and has the other end of the connecting rod as an output shaft.

[0010]

The present invention having the above-described structure operates as follows. That is, when the water gate (not shown) is lifted by the driving force of the electric motor, the sun spur gear of the planetary gear reducer connected to the electric motor is rotated by driving the electric motor, and the internal gear is driven by the self-locking manual side worm gear. Since the rotation is blocked, the planetary spur gear revolves around the sun spur gear, and the output shaft connected to the revolving planetary spur gear via the connecting rod rotates, and the output shaft becomes the opening / closing mechanism of the sluice door. The driving force is transmitted to act to raise a water gate (not shown).

On the other hand, when the water gate (not shown) is lifted by the driving force by the manual operation, when the manual handle is turned,
The internal gear rotates through the manual worm wheel, and the sun spur gear is blocked from rotation by the self-locked electric worm wheel.Therefore, the planetary spur gear that meshes with the rotating internal gear is fixed in the sun spur gear. The output shaft that revolves around the circumference and is connected to the revolving planetary spur gear via the connecting rod rotates, and the output shaft transmits the driving force to the opening / closing mechanism of the sluice gate to raise the sluice gate (not shown). Act on.

Further, when the ascending sluice gate (not shown) is electrically or manually lowered, the same operation as in the case of the above-mentioned raising is carried out. At this time, the electric motor and the manual handle are turned in the opposite direction to the raising. By rotating it, it acts so as to lower the water gate (not shown).

Further, when lowering the rising water gate (not shown) by its own weight, the clutch disengages the connection between the electric motor and the sun spur gear shaft to make the sun spur gear idle. When the water gate (not shown) descends by its own weight, the output shaft rotates in the reverse direction, and the planetary spur gear connected to the output shaft via the connecting rod revolves around the sun spur gear. The rotation of the internal gear on the outer peripheral side of the planetary spur gear is blocked by the worm wheel on the manual side, which is self-locking.
Since the sun spur gear is free to spin, when the planetary spur gear revolves around the sun spur gear, the sun spur gear that meshes with the sun spur gear spins idle, which hinders the descent door from falling due to its own weight. Acts to prevent.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more concretely with reference to the embodiments shown in the drawings. Here, FIG. 1 is a schematic mechanical view, FIG. 2 is a plan layout view, FIG. 3A is a sectional view taken along the line AA of FIG. 2, and FIG. 3B is a sectional view taken along the line BB of FIG. .

In the figure, in this embodiment, a rack rod a is moved up and down to open and close a water gate (not shown). The rack rod a has a structure in which it is raised by meshing with a rotating rack and pinion gear b to open the sluice gate. The sluice door has a structure that descends and closes due to its own weight.

The rack and pinion gear b is adapted to be rotated by driving the electric motor 1 or the manual handle 2. In this embodiment, the rack rod a and the rack and pinion gear b are provided at the end of the drive force transmission path for opening and closing the water gate door, and the electric motor 1 is provided at the start end of the drive force transmission path. The manual handle 2 is provided so as to branch from the middle of the driving force transmission path. A planetary gear reducer 3, an internal gear 4, and a manual-side worm gear 5 are arranged at a position where the manual handle 2 branches off in the middle of the driving force transmission path.

An overtorque detecting gear 6a is mounted on the drive shaft 1a of the electric motor 1. The overtorque detection gear 6a functions to cause the overtorque detection device 6 for detecting the overload torque to detect the overload torque of the electric motor 1 through the limit switch 6b. A gear 1b meshes downward with the overtorque detection gear 6a, and the gear 1b meshing with the overtorque detection gear 6a is interlocked with an electric worm 7a constituting an electric worm gear 7 via a rotary shaft 1c. ing.

An electric worm wheel 8 is meshed with the electric worm 7a. The electric worm gear 7 is composed of the electric worm 7 a and the electric worm wheel 8. The electric worm 7a has a function of preventing the electric worm wheel 8 from rotating when the electric worm 7a does not rotate, whereby the electric worm wheel 8 is self-lockable.

At the center of rotation of the worm wheel 8 on the electric side, the tip of a sun spur gear shaft 3c, which will be described later, is fixed. A clutch 9 is attached to the rear surface of the electric worm wheel 8. A multi-plate clutch is used as the clutch 9, for example. The clutch 9 has a function of connecting and disconnecting the electric worm gear 7 and a sun spur gear shaft 3c described later.

The clutch 9 is provided with a clutch lever 9a for disengagement. In addition, a spring 9 for returning from the disengaged state to the connected state is provided on the rear portion of the clutch 9.
b is provided, and the clutch 9 is biased toward the electric side worm wheel 8 side by the spring 9b. When the hand is released from the clutch lever 9a which is in the disengaged state of the clutch 9, the clutch 9 is automatically returned to the engaged state by the spring 9b.

When the sluice door is lowered by its own weight, the clutch lever 9a is operated to disengage the electric worm gear 7 from the sun spur gear shaft 3c, which will be described later, by the clutch 9, and the electric motor 1, the rack rod a and the rack pinion are separated. Gear b
And make it intermittent. By separating the electric side worm gear 7 and the sun spur gear shaft 3c from each other, the electric motor 1 that is stopped is stopped.
And the braking force by the worm gear 7 on the electric side is released,
The rack rod a connected to the sluice door starts to descend.

The planetary gear reducer 3 has a sun spur gear 3a located at the center thereof, a planet spur gear 3b revolving around the sun spur gear 3a while meshing with the sun spur gear 3a, and a planet spur gear 3b.
And an internal gear 4 that meshes with. The internal gear 4 is formed on the outer circumference in the revolving direction of the planetary spur gear 3b that revolves around the sun spur gear 3a. Since the sun spur gear 3a, the planetary spur gear 3b, and the internal gear 4 all mesh in the same plane, it is possible to reduce the friction loss of power generated in the bearing as compared with the case where the gears mesh at right angles.

A sun spur gear shaft 3c is fixed to the center of rotation of the sun spur gear 3a. The tip of the sun spur gear shaft 3c can be freely connected and disconnected with the electric worm gear 7 through the clutch 9. Rotational force of the sun spur gear 3a is transmitted via the electric worm gear 7 and the clutch 9 through the sun spur gear shaft 3c.

A manual worm gear 5 which constitutes a manual worm gear 5 for rotating the internal gear 4 of the planetary gear reducer 3 is integrally connected. In this embodiment, the internal gear 4 and the manual side worm wheel 5a are integrally connected by a connecting rod 4a. Internal gear 4 is planetary gear reducer 3
Is formed on the inner circumference of the cylindrical body 4b formed on the outer circumference. The internal gear 4 is configured to rotate integrally with the manual side worm wheel 5a of the manual side worm gear 5 when it rotates. If the manual side worm wheel 5a is prevented from rotating, the internal gear 4 also does not rotate.

A manual worm wheel 5a meshing with the internal gear 4 is provided with a manual worm wheel 5b meshing with the manual worm wheel 5a. The manual side worm gear 5 is composed of the manual side worm wheel 5a and the manual side worm 5b. If the manual side worm 5b does not rotate itself, the manual side worm wheel 5a
Has a function to prevent the rotation of the manual side worm gear 5, so that the manual side worm gear 5 can be self-locked.

Manual-side worm 5 of manual-side worm gear 5
b is connected to the manual handle 2 via a power transmission path such as a rotary shaft 5c, gears 5d and 5e, and a rotary shaft 5f. By rotating the manual handle 2, the manual worm 5b of the manual worm gear 5 is rotated, and the manual worm wheel 5a of the manual worm gear 5 that meshes with the manual worm 5b is rotated, so that the manual worm wheel 5a is integrated with the manual worm wheel 5a. The internal gear 4 is rotated.

A screw brake 2a is provided in the middle of the power transmission path between the manual handle 2 and the manual worm gear 5. This screw brake 2a is a worm 5 on the manual side.
Through b, the worm gear 5 on the manual side is self-locked, and both functions as a brake. Further, the manual handle 2 is provided with an overtorque adjusting device 2b so that the torque can be adjusted.

In the planetary gear reducer 3, an output shaft 10 is arranged on the opposite side of the sun spur gear shaft 3c with the sun spur gear 3a and the planet spur gear 3b interposed therebetween. The output shaft 10 has its axis aligned with the axis of the sun spur gear shaft 3c, and is arranged in the extension direction of the sun spur gear shaft 3c. The output shaft 10 is provided in a non-connected state with the sun spur gear shaft 3c.

One end of the connecting rod 10a is rotatably connected to the center of rotation of the planetary spur gear 3b, which revolves around the sun spur gear 3a. The connecting rod 10a extends in the direction of the center of rotation of the planetary spur gear 3b and is bent at a right angle on the way, and the other end is fixed to the output shaft 10. When the planetary spur gear 3b revolves around the sun spur gear 3a, the output shaft 10 rotates integrally with the revolving planetary spur gear 3b,
The driving force is transmitted to the rack rod a and the rack and pinion gear b that constitute the opening / closing mechanism of the water gate.

The output shaft 10 includes rotating shafts 11 and 12 and a gear 1.
Through a power transmission path such as 0b, 11a, 11b, and 12a, the rack rod a and the rack and pinion gear b, which constitute the opening / closing mechanism of the water gate, are interlockingly connected. The rack and pinion gear b is provided on the rotating shaft 12.

The output shaft 10 and the rack and pinion gear b
A centrifugal brake 10c is provided in the middle of the power transmission path to and. The centrifugal brake 10c functions as a brake when the rack rod a descends due to the weight of the sluice door, prevents the sluice door from freely falling, and performs a uniform speed descent, thereby ensuring safety. It prevents things from breaking down.

The centrifugal brake 10c has a mechanism in which when the output shaft 10 rotates at a high speed, the centrifugal force is utilized to generate a brake. That is, the centrifugal brake 10c has a brake piece attached to its rotating shaft, and when the rotating shaft rotates at a high speed, the brake piece opens to the outside and comes into contact with the inner peripheral surface thereof, and the contact friction causes a brake. It has become.

The operation based on the configuration of the above embodiment will be described below. In order to operate the electric motor 1 and raise the water gate (not shown), the following operation is performed. That is,
When the electric motor 1 is operated, the drive shaft 1a rotates, and the electric worm 7a forming the electric worm gear 7 connected to the drive shaft 1a rotates. In this case, the clutch 9 is connected in advance and the electric worm gear 7 and the sun spur gear shaft 3c are connected in advance. When an abnormal load is applied to the rack rod a, it is detected by the overtorque detection device 6 and the operation of the electric motor 1 is stopped.

When the electrically driven worm gear 7 rotates, the sun spur gear shaft 3c, which is connected to the worm gear 7 by the clutch 9, is connected.
Also rotates. When the sun spur gear 3c rotates, the sun spur gear 3a connected to it rotates together. The planetary spur gear 3b that meshes with the rotating sun spur gear 3a also rotates.

In this case, the manual worm gear 5 is self-locked by the stopped manual worm 5b. Therefore, the internal gear 4 integrally connected to the manual worm wheel 5a of the manual worm gear 5 is in a stopped state. Therefore, when the sun spur gear 3a rotates,
The planetary spur gear 3b that meshes with this revolves around the sun spur gear 3a because the internal gear 4 is in a stopped state.

When the planetary spur gear 3b revolves around the sun spur gear 3a, the revolving planetary spur gear 3b and the connecting rod 10a.
The output shaft 10, which is connected via the shaft, also rotates in the same direction. When the output shaft 10 rotates, its turning force causes the rack pinion gear b at the end thereof to rotate via the drive power transmission path, and the rack pinion gear b that rotates rotates the rack rod a that meshes with this. , Ascending rack bar a
The sluice gate also rises and opens via.

Subsequently, when the electric motor 1 is stopped and the sluice door is opened by using the manual handle 2, the following operation is performed. That is, when the manual handle 2 is turned, the manual side worm 5 connected to the manual handle 2 in an interlocking manner.
b rotates. In this case, the clutch 9 is connected in advance and the electric worm gear 7 and the sun spur gear shaft 3 are connected.
Keep c connected.

When the manual side worm 5b rotates, the manual side worm wheel 5a meshing with the manual side worm 5b rotates. When the manual side worm wheel 5a rotates, it is connected to the worm wheel 4a.
The internal gear 4 integrally connected by a rotates integrally.

At this time, the electric motor 1 is in a stopped state, and the stopped electric motor 1 and the worm gear 7 on the electric side are connected to the sun spur gear shaft 3c through the clutch 9.
The sun spur gear 3a does not rotate due to the stopped electric motor 1 and the electric worm gear 7. Therefore, the planetary spur gear 3b meshing with the internal gear 4 rotates as the internal gear 4 rotates,
It revolves around the sun spur gear 3a in a stopped state.

When the planetary spur gear 3b revolves around the sun spur gear 3a, the revolving planetary spur gear 3b and the connecting rod 10a.
The output shaft 10, which is connected via the shaft, also rotates in the same direction. When the output shaft 10 rotates, its turning force causes the rack pinion gear b at the end thereof to rotate via the drive power transmission path, and the rack pinion gear b that rotates rotates the rack rod a that meshes with this. , Ascending rack bar a
The sluice gate also rises and opens via.

On the other hand, when the open water gate is closed by using its own weight, the following operation is performed. In this case, the clutch lever 9a is operated to move the clutch 9 rearward to disengage the clutch, and the electric worm gear 7
And the connection state of the sun spur gear shaft 3c are disconnected. As a result, the electric motor 1 and the electric-side worm gear 7 that functions as a brake are disconnected from the driving force transmission path and are in a non-connection state.

The rack rod a descends due to the weight of the sluice door, and the rack and pinion gear b meshing with the rack rod a rotates in the opposite direction as the rack rod a descends. When the rack and pinion gear b rotates, the output shaft 10 interlocked with this also rotates in the reverse direction. At this time, the centrifugal brake 10c acts on the output shaft 10 that rotates in the reverse direction to prevent the output shaft 10 from rotating in the reverse direction at a high speed, and the braking force of the centrifugal brake 10c is the output shaft 10. Also, the rack rod a is prevented from rapidly descending through the rack and pinion gear b.

When the output shaft 10 rotates in the reverse direction, the planetary spur gear 3b, which is interlocked with the output shaft 10 via the connecting rod 10a, revolves around the sun spur gear 3a in the opposite direction. In this case, since the manual side worm wheel 5a is in the self-locking state and the internal gear 4 does not rotate, the sun spur gear 3a that meshes with the planetary spur gear 3b rotates.

The sun spur gear 3a is a sun spur gear shaft 3c.
Through the clutch 9, the connection with the worm 7a on the electric side, which is interlockingly connected via the clutch 9, is released by the operation of the clutch lever 9a, so that the wheel rotates idly.

At this time, since the electric side worm gear 7 and the sun spur gear shaft 3c are separated by the action of the clutch 9, the sun side spur gear shaft 3c only idles, and the electric side worm gear 7 connected to the clutch 9 is inoperative. The electric side worm 7a does not rotate, and the driving force due to the lowering of the rack rod a does not act on the electric motor 1 as well. Further, since the manual side worm gear 5 is in the self-locking state, the internal gear 4 does not rotate,
The manual handle 2 also does not rotate.

In this case, as described above, the clutch 9 is operated to disconnect the connection between the sun spur gear shaft 3c and the electric-side worm gear 7 acting as a brake and the electric motor 1 so that the sun spur gear shaft 3c is not connected. Up to the rack and pinion gear b is reversed by the load and the load drops. The descending speed is controlled by the centrifugal brake 10c. Since the self-weight lowering speed is 10 times or more faster than the opening / closing speed during electric operation, the centrifugal brake 10c rotates at the same time during electric operation, but acts only as a minute load.

When the vehicle is stopped in the middle of its own weight descent, the clutch 9 is connected to connect the electric side worm gear 7 and the sun spur gear shaft 3c, and the electric side worm gear 7 and the stopped electric motor 1 serve as a brake. As it works, the descent stops.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0049]

As is apparent from the above description, according to the sluice gate opening / closing device of the present invention, when the sluice gate is opened / closed by the driving force of the electric motor, the planetary gear reducer is connected to the sluice door by driving the electric motor. The sun spur gear rotates, and the internal gear is prevented from rotating by the self-locking manual side worm wheel, so the planet spur gear revolves around the sun spur gear and connects to the revolving planet spur gear. The output shaft connected via the above rotates, the driving force of the electric motor can be transmitted to the opening / closing mechanism of the sluice door through the output shaft, and the sluice gate can be opened / closed by the driving force.

Similarly, when the sluice door is opened / closed by the driving force by the manual operation, when the manual handle is turned, the internal gear is rotated through the manual side worm wheel, and the sun spur gear is moved by the self-locked electric side worm wheel. Since rotation is blocked, the planetary spur gear that meshes with the rotating internal gear revolves around the fixed sun spur gear, and the output shaft that is connected to the revolving planetary spur gear via the connecting rod rotates. The driving force by manual operation can be transmitted to the opening / closing mechanism of the sluice door through the output shaft, and the sluice door can be opened / closed by the driving force.

As described above, when the opening / closing of the water gate is switched from electric to manual or from manual to electric, the switching operation can be made unnecessary. Moreover, the self-locking by the worm gear eliminates the need for an electric control mechanism for performing the self-locking.
Further, since the gears mesh with each other in the same plane, it is possible to reduce the friction loss of power generated in the bearing as compared with the case where the gears mesh with each other at a right angle. Further, the respective devices can be efficiently arranged around the rack bar for suspending the door body, and the size can be reduced and the installation space can be reduced.

Further, when the clutch for switching the sun spur gear shaft of the planetary gear reducer and the drive shaft of the electric motor between the connected state and the disconnected state is provided as in claim 2, the sluice door is provided with its own weight. By lowering the connection with the electric motor by operating the clutch when lowering the vehicle, it is possible to prevent the stopped electric motor from interfering with the lowering of the electric motor.

[Brief description of drawings]

FIG. 1 is a schematic mechanism diagram showing an embodiment of the present invention.

FIG. 2 is a plan layout view showing an embodiment of the present invention.

FIG. 3A is a sectional view taken along the line AA of FIG.
FIG. 3B is a sectional view taken along the line BB of FIG.

FIG. 4 is a conventional explanatory diagram.

FIG. 5 is a conventional explanatory diagram.

[Explanation of reference numerals] 1 electric motor 1a drive shaft 1b gear 1c rotating shaft 2 manual handle 2a screw brake 2b overtorque adjusting device 3 planetary gear reducer 3a sun spur gear 3b planetary spur gear 3c sun spur gear shaft 4 internal gear 4a connection Rod 4b Cylindrical body 5 Manual side worm gear 5a Manual side worm wheel 5b Manual side worm 5c Rotation shaft 5d Gear 5e Gear 5f Rotation shaft 6 Overtorque detection device 6a Overtorque detection gear 6b Limit switch 7 Electric side worm gear 7a Electric side worm 8 Electric Worm Wheel 9 Clutch 9a Clutch Lever 9b Spring 10 Output Shaft 10a Link Rod 10b Gear 10c Centrifugal Brake 11 Rotating Shaft 11a Gear 11b Gear 12 Rotating Shaft 12a Gear a Rack Bar b Rack Pinion Gear

Claims (2)

[Claims] 1. A sun spur gear, a planet spur gear that revolves while meshing in the same plane around the sun spur gear, and a revolving planet spur gear in the middle of a drive force transmission path for opening and closing a water gate. A planetary gear reducer composed of meshing internal gears is arranged, and the sun spur gear shaft of the planetary gear reducer is drivenly connected to the drive shaft of the electric motor via a self-lockable electric worm gear, and the internal gear is manually operated. It is drivenly connected to the drive shaft of the handle via a manual worm gear that can be self-locked.
The output shaft that transmits the driving force to the opening / closing mechanism of the sluice gate is aligned with the axis of the sun spur gear and is not connected to the sun spur gear, and one end of the rod is connected to the rotation center of the planetary spur gear. A sluice door opening / closing device, which is rotatably connected and has the other end of the connecting rod as an output shaft. 2. A sluice gate opening / closing device according to claim 1, further comprising a clutch for switching between the connected state and the disconnected state of the sun spur gear shaft of the planetary gear reducer and the drive shaft of the electric motor.