JP6924664B2 - Sluice gate opening and closing device - Google Patents

Description

The present invention relates to a water gate opening / closing device that raises and lowers the door body of the water gate.

The water gate opening / closing device in which the door body is suspended from the chain raises and lowers the door body by rotationally driving the sprocket on which the chain is hung. If there is no abnormality in the device while raising and lowering the door body, the load generated on the sprocket and the chain will be within the predetermined range. On the other hand, if an abnormality such as a stone being caught between the door body and the guide member occurs while the door body is rising, the load generated on the sprocket and the chain becomes larger than the predetermined range and becomes an overload state.
Further, if there is an abnormality during the descent of the door body such as driftwood being caught between the door body during the descent and the bottom of the floodgate, the load generated on the sprocket and the chain becomes smaller than the predetermined range.

Therefore, it is possible to detect an abnormality based on the load generated on the sprocket or the chain, and Patent Document 1 describes a specific example of a loosening overload detecting device that detects an abnormality from the load generated on the chain. Has been done. The loosening overload detector has a rod to which an upward force is applied from the spring, the rod descends as the load on the chain increases and rises as the load on the chain decreases. Therefore, the loosening overload detecting device can detect an abnormality based on the height position of the rod.

Japanese Unexamined Patent Publication No. 2015-129390

However, the loosening overload detection device described in Reference 1 needs to be provided at a position horizontally separated from directly above the movable sprocket (guide sprocket) that moves up and down as the door body moves up and down. Due to design restrictions, it was sometimes not possible to install a loose overload detection device. Further, the loosening overload detecting device could not be adopted for the water gate opening / closing device having no movable sprocket and having one end of the chain directly connected to the door body.

In this respect, the same can be said for a floodgate opening / closing device in which the door body is suspended from a wire. In the water gate opening / closing device in which one end of the wire is directly connected to the door body, the door body can be raised and lowered by rotationally driving the drum around which the wire is wound, based on the load generated on the drum. Abnormality can be detected with.
The present invention has been made in view of such circumstances, and in a type having a movable sprocket, a mechanism for detecting the presence or absence of an abnormality when the door body is raised and lowered is placed at a position horizontally separated from directly above the movable sprocket. It is an object of the present invention to provide a water gate opening / closing device that does not need to be provided and can be adopted even in a type in which one end of a chain or a wire is directly connected to a door body.

In the water gate opening / closing device according to the first invention according to the above object, the motor, the door body suspended from the chain, and the chain are hung, and the driving force of the motor is applied to rotate and drive the door body. In a water gate opening / closing device having a sprocket for raising and lowering , A position detecting means for detecting the position of the slide axis in the axial direction, a determining means for determining the presence or absence of an abnormality based on the detection of the position detecting means, and a direction opposite to the force F with respect to the slide axis. The first and second elastic bodies on which elastic forces are applied, respectively, and expansion and contraction limiting means for preventing the compression or expansion of the first elastic body from exceeding a predetermined amount are provided, and the Young's ratio of the first elastic body is provided. Is smaller than the Young's ratio of the second elastic body.

In the water gate opening / closing device according to the first invention, the first and second elastic bodies are preferably disc springs or coil springs through which the slide shaft is inserted at the center, respectively.

In the water gate opening / closing device according to the first invention, in the expansion / contraction limiting means, the first elastic body is arranged inside, and the axial length of the slide shaft is compared with the natural length of the first elastic body. Is a short cover body, and members A and B are provided on one side and the other side in the axial direction of the slide shaft with the cover body as the center, and the axial direction of the slide shaft of the first elastic body. When the amount of compression of the cover body reaches a predetermined amount, the cover body is in a state where one side end portion and the other side end portion in the axial direction of the slide shaft are in contact with the members A and B, respectively, and the first It is preferable to prevent further compression of the elastic body of 1.

In the water gate opening / closing device according to the second invention according to the above object, the motor, the door body suspended from the wire, and the wire are wound and the driving force of the motor is applied to rotate and drive the door body. In a water gate opening / closing device having a drum for raising and lowering, a slide shaft provided so as to be movable in the axial direction and a force F having a magnitude corresponding to the magnitude of the load generated on the drum acts in the axial direction. A position detecting means for detecting the position of the slide shaft in the axial direction, a determining means for determining the presence or absence of an abnormality based on the detection of the position detecting means, and elasticity of the slide shaft in a direction opposite to the force F. A first and second elastic body on which a force is applied, and expansion / contraction limiting means for preventing the compression or expansion of the first elastic body from exceeding a predetermined amount are provided, and the Young's modulus of the first elastic body is , Smaller than the Young's modulus of the second elastic body.

The water gate opening / closing device according to the first and second inventions is provided so as to be movable in the axial direction, and depends on the magnitude of the load generated on the sprocket (in the water gate opening / closing device according to the second invention, the drum). A slide axis in which a force F having a large force F acts in the axial direction, a position detecting means for detecting the position of the slide axis in the axial direction, and a determining means for determining the presence or absence of an abnormality based on the detection of the position detecting means. , A first and second elastic body that exerts an elastic force in a direction opposite to the force F on the slide axis, and expansion / contraction limiting means for preventing the compression or expansion of the first elastic body from exceeding a predetermined amount. , The Young's modulus of the first elastic body is smaller than the Young's modulus of the second elastic body. Therefore, there are no major restrictions on the installation positions of the slide shaft, the position detecting means, the determining means, the first and second elastic bodies, and the expansion / contraction limiting means required to detect the presence or absence of an abnormality when the door body is raised and lowered, and the door body is movable. In the type having a sprocket, it is not necessary to provide a mechanism for detecting the presence or absence of an abnormality when raising and lowering the door body at a position horizontally separated from directly above the movable sprocket, and further, a chain (water gate according to the second invention). In the opening / closing device, the mechanism can be adopted even in a type in which one end of the wire) is directly connected to the door body.

It is explanatory drawing of the water gate opening and closing device which concerns on 1st Embodiment of this invention. It is explanatory drawing of a power transmission mechanism. It is explanatory drawing of the slide shaft, the position detection means and the 1st and 2nd elastic bodies. (A), (B), and (C) are explanatory views showing the relationship between the moving distance of the slide axis and the first and second elastic bodies, respectively. It is explanatory drawing which shows the relationship between the load generated in a sprocket and the movement distance of a slide shaft. It is explanatory drawing of the water gate opening and closing device which concerns on 2nd Embodiment of this invention.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
As shown in FIGS. 1 and 2, in the water gate opening / closing device 10 according to the first embodiment of the present invention, the motor 11, the door body 13 suspended from the chain 12, and the chain 12 are hung. It has a sprocket (driving sprocket) 14 that is given a driving force of the motor 11 to rotate and drive the door body 13 up and down. Hereinafter, a detailed description will be given.

As shown in FIG. 1, one end of the chain 12 is connected to the door body 13, and the other end of the chain 12 is connected to the counterweight 15. As shown in FIGS. 1 and 2, the floodgate opening / closing device 10 applies the driving force of the motor 11 to the sprocket 14 in addition to the sprocket 14 to which the chain 12 is hung and the driven sprocket 16 and 17 to which the chain 12 is hung. It is provided with a power transmission mechanism 18 for transmitting to.
As shown in FIG. 2, the power transmission mechanism 18 includes a sun gear 20 that is rotationally driven by the operation of a motor 11 and a plurality of planetary gears 21 arranged around the sun gear 20.

The internal gears 22 connected to the worm foil 23 mesh with the plurality of planetary gears 21, and the worm 24 meshes with the worm foil 23 as shown in FIGS. 2 and 3.
Further, as shown in FIG. 2, the power transmission mechanism 18 includes a plurality of shaft members 25 having one end connected to the center of each of the plurality of planetary gears 21, and a gear 26 having the other ends of the plurality of shaft members 25 connected to each other. A gear 26a meshed with the gear 26 and a rotating shaft 27 connected to the center of the gear 26a are provided. As shown in FIG. 1, the rotating shaft 27 is connected to the sprocket 14, and the sprocket 14 rotates together with the rotating shaft 27.

When the sun gear 20 is rotationally driven by the operation of the motor 11 in a state where no rotational force is acting from the worm 24 to the worm wheel 23 due to the self-locking of the worm wheel 23 by the worm 24, the worm wheel 23 and the internal gear 22 are moved. In the stopped state, the planetary gear 21 revolves around the sun gear 20 while rotating. The revolution of the planetary gear 21 causes the gears 26 and 26a to be rotationally driven, the rotating shaft 27 to be rotationally driven together with the gear 26a, and the sprocket 14 to be rotationally driven.

The motor 11 can change the direction in which the sun gear 20 is rotationally driven by switching the operation mode, and the direction in which the sprocket 14 is rotationally driven is determined by the direction in which the sun gear 20 is rotationally driven. In the present embodiment, the door body 13 is raised by driving the sprocket 14 to rotate clockwise, and the door body 13 is lowered by driving the sprocket 14 to rotate counterclockwise, but the sprocket 14 is driven counterclockwise. The power transmission mechanism 18 may be designed so that the door body 13 is raised by the rotational drive and the door body 13 is lowered by the clockwise rotation drive of the sprocket 14.

As shown in FIG. 3, the worm 24 is provided on a slide shaft 28 movably provided in the axial direction, and the slide shaft 28 is provided with a position detecting means 29 for detecting the position of the slide shaft 28 in the axial direction. Are in contact. In the present embodiment, the worm 24 and the slide shaft 28 are integrally manufactured, but the worm 24 and the slide shaft 28 may be manufactured separately and then mounted on the slide shaft 28.
The slide shaft 28 is rotatably supported by bearing members 30, 31, 32, and one end side of the slide shaft 28 is attached to a receiving member 34 rotatably supported by the bearing member 33.
Hereinafter, it is assumed that one end and the other end of the slide shaft 28 are arranged on the left and right, respectively, with reference to the center in the axial direction of the slide shaft 28.

The receiving member 34 and the left end side of the slide shaft 28 are connected by a key connection, and the receiving member 34 rotates around the axis of the slide shaft 28 together with the slide shaft 28.
The bearing members 30, 31, and 32 are arranged at intervals from left to right in order, and the bearing member 30 and the bearing member 32 that rotatably supports the right end of the slide shaft 28 are slide shafts. It is designed to move left and right together with 28. On the other hand, the receiving member 34 and the bearing member 31 do not move left and right.

Between the bearing members 30 and 31, a plurality of disc springs 35 (10 in the present embodiment) through which the slide shaft 28 is inserted at the center and a plurality of disc springs 35 through which the slide shaft 28 is inserted at the center (in the present embodiment). Two disc springs 36) are provided. In the present embodiment, a plurality of disc springs 35 combined in series form a first elastic body, and a plurality of disc springs 36 combined in series form a second elastic body. The plurality of disc springs 35 (the same applies to the plurality of disc springs 36) are arranged along the axis of the slide shaft 28.

The bearing member 30 comes into contact with the leftmost disc spring 35 from the left side, and the slide shaft 28 is centered between the rightmost disc spring 35 and the leftmost disc spring 36. An annular member 37 to be inserted is provided. The bearing member 31 is in contact with the disc spring 36 arranged on the far right from the right side.
A cover body (an example of expansion / contraction limiting means) 38 in which a plurality of disc springs 35 are arranged inside is provided between the bearing member 30 and the annular member 37. The cover body 38 has a tubular shape, and the length of the slide shaft 28 in the axial direction is shorter than the natural length of the plurality of disc springs 35 (the natural length of the first elastic body).

In the present embodiment, the bearing member 30 and the annular member 37 correspond to the members A and B, respectively.
Further, the receiving member 34 is connected to a deceleration mechanism 40 that receives the driving force from the manual handle 39 and applies the driving force to the member 34. The receiving member 34 is given a driving force from the manual handle 39 via the speed reduction mechanism 40, and is rotationally driven together with the slide shaft 28 and the worm 24.
When the manual handle 39 is manually rotated while the motor 11 is not operating and the sun gear 20 is fixed, the slide shaft 28 and the worm 24 are rotationally driven, and the worm wheel 23 and the internal gear 22 are rotated. , Each planetary gear 21 revolves around the sun gear 20. As a result, the rotating shaft 27 and the sprocket 14 are rotationally driven, and the door body 13 rises or falls.

Therefore, in the present embodiment, the door body 13 can be raised and lowered by the operation of the motor 11 or the rotation of the manual handle 39 by human power. The water gate opening / closing device 10 is provided with a mechanism (not shown) for fixing the sun gear 20.
Due to the weight of the door body 13 and the like, the sprocket 14 is loaded in the direction in which the door body 13 is lowered. Therefore, a force acts on the worm foil 23 in the circumferential direction of the worm foil 23, and a force F acts on the worm 24 and the slide shaft 28 in the axial direction of the slide shaft 28 (to the right in the present embodiment). ..

As shown in FIG. 4A, assuming that the position of the slide shaft 28 when the disc springs 35 and 36 have natural lengths is the initial position, the slide shaft 28 is shown in FIGS. 4B and 4C. As described above, the rightward force F acting on the slide shaft 28 causes the slide shaft 28 to move to the right side from the initial position. Each of the disc springs 35 and 36 is in a compressed state because the slide shaft 28 is moved to the right side from the initial position, and is elastic in the left direction (opposite direction to the force F) with respect to the slide shaft 28 via the bearing member 30. Apply force.
The slide shaft 28 is arranged at a position where the rightward force F acting on the slide shaft 28 and the leftward elastic force of the plurality of disc springs 35 and the plurality of disc springs 36 are balanced.

The rightward force F acting on the slide shaft 28 has a magnitude corresponding to the magnitude of the load generated on the sprocket 14, and when the load generated on the sprocket 14 increases, the force acting on the slide shaft 28. When F becomes large, the slide shaft 28 moves to the right, and then when the load generated on the sprocket 14 becomes small, the force F acting on the slide shaft 28 becomes small, and the slide shaft 28 moves to the left (). Approaching the initial position).
Therefore, if the load generated on the sprocket 14 is large, as shown in FIG. 5, the amount of deviation of the slide shaft 28 from the initial position to the right (hereinafter, also simply referred to as “the amount of deviation of the slide shaft 28”) is large. Become.

In the present embodiment, the Young's modulus of the disc spring 35 is smaller than the Young's modulus of the disc spring 36 (that is, the Young's modulus of the first elastic body is smaller than the Young's modulus of the second elastic body). Then, the cover body 38 has a left end portion and a right end portion when the compression in the axial direction of the slide shafts 28 of the plurality of countersunk springs 35 becomes a predetermined amount as the slide shaft 28 moves to the right. (One side end and the other side end in the axial direction of the slide shaft 28) are in contact with the bearing member 30 and the annular member 37, respectively, to limit further compression of the plurality of countersunk springs 35 (that is,). , Preventing the compression of the first elastic body from exceeding a predetermined amount).

Therefore, as shown in FIG. 4B, the slide when the left end portion and the right end portion of the cover body 38 come into contact with the bearing member 30 and the annular member 37 due to the rightward movement of the slide shaft 28, respectively. Assuming that the displacement amount of the shaft 28 is D, in the process in which the load generated on the sprocket 14 increases and the slide shaft 28 moves to the right, when the displacement amount of the slide shaft 28 is less than D, each countersunk spring When the amount of compression of 35 and each of the countersunk springs 36 increases and the amount of displacement of the slide shaft 28 is D or more, the amount of compression of each of the countersunk springs 36 increases as shown in FIGS. The amount of compression of each countersunk spring 35 whose further compression is prevented by the cover body 38 does not change.

When the compression amount of each disc spring 35 and the compression amount of each disc spring 36 are increasing, the compression amount of each disc spring 35 is the compression of each disc spring 36 due to the relationship between the Young's modulus of the disc spring 35 and the disc spring 36. Increases from the amount. Moreover, since the entire plurality of countersunk springs 35 (first elastic body) is longer in the axial direction of the slide shaft 28 than the entire plurality of countersunk springs 36 (second elastic body), each of the countersunk springs 35 When the amount of compression and the amount of compression of each disc spring 36 are increasing, the ratio of the increase in the amount of compression of the plurality of disc springs 35 to the increase of the total amount of compression of the plurality of disc springs 36 is the compression of the disc spring 36 alone. It is larger than the ratio of the increase in the amount of compression of the countersunk spring 35 alone to the increase in the amount.

On the other hand, in the process in which the load generated on the sprocket 14 is reduced and the slide shaft 28 is moving to the left, when the deviation amount of the slide shaft 28 is D or more, it is shown in FIGS. 4 (B) and 4 (C). As described above, the compression amount of each disc spring 36 decreases, but the compression amount of each disc spring 35 does not change, and when the deviation amount of the slide shaft 28 is less than D, the compression amount of each disc spring 35 and each disc spring 36 The amount of compression is reduced together.
From the relationship between the Young's modulus of the disc spring 35 and the disc spring 36, the ratio of the change (increase or decrease) in the amount of displacement of the slide shaft 28 to the change (increase or decrease) in the load occurring in the sprocket 14 is shown in FIG. As shown in the above, the case where the deviation amount of the slide shaft 28 is less than D is larger than the case where the deviation amount of the slide shaft 28 is D or more.

By the way, the fact that the load generated on the sprocket 14 is larger than the predetermined range means that when the door body 13 is raised, a phenomenon that hinders the rise of the door body 13 occurs, and the sprocket 14 has a load. When the generated load becomes smaller than the predetermined range, it means that a phenomenon that hinders the descent of the door body 13 occurs when the door body 13 is descending. Therefore, it is possible to detect the presence or absence of an abnormality based on the value of the load generated on the sprocket 14.

When no abnormality has occurred, the magnitude of the load generated on the sprocket 14 is L or more and H or less, and when an abnormality has occurred, the load generated on the sprocket 14 is less than L or H (H>. If it exceeds L), in the present embodiment, the determination means 41 (see FIG. 1) connected to the position detection means 29 determines the presence or absence of an abnormality as follows.

That is, as shown in FIG. 5, when the magnitude of the load generated on the sprocket 14 is L, the amount of deviation of the slide shaft 28 is P, and when the magnitude of the load generated on the sprocket 14 is H, the slide shaft With the deviation amount of 28 as Q, the determination means 41 determines that there is no abnormality when the position detection means 29 detects that the deviation amount of the slide shaft 28 is P or more and Q or less, and the slide shaft 28 is displaced. When the position detecting means 29 detects that the amount is less than P or exceeds Q, it is determined that there is an abnormality. Therefore, the determination means 41 determines the presence or absence of an abnormality based on the amount of deviation detected by the position detection means 29. The determination means 41 can be configured to include, for example, a CPU, a memory, and the like.

Assuming that the magnitude of the load generated on the sprocket 14 when the amount of displacement of the slide shaft 28 is D is M, the design and adjustment of various members so that the relationship of P <D <Q and L <M <H is obtained. Is being done.
Therefore, from the state where the movement distance of the slide shaft 28 is P or more and Q or less and it is determined that there is no abnormality, at the timing when the movement distance of the slide shaft 28 becomes less than P and it is determined that there is an abnormality, each The amount of compression is decreasing in each disc spring 35 in addition to the disc spring 36, and the ratio of the decrease in the amount of displacement of the slide shaft 28 to the decrease in the load generated in the sprocket 14 is large.

On the other hand, from the state where the movement distance of the slide shaft 28 is P or more and Q or less and it is determined that there is no abnormality, at the timing when the movement distance of the slide shaft 28 exceeds Q and it is determined that there is an abnormality, each dish. The compression amount of the spring 35 has not changed, only the compression amount of each disc spring 36 is increasing, and the ratio of the increase in the displacement amount of the slide shaft 28 to the increase in the load generated in the sprocket 14 is small.

Here, in general, the change (decrease) in the load of the sprocket 14 caused by the phenomenon that hinders the descent of the door body 13 is compared with the change (increase) in the load of the sprocket 14 caused by the phenomenon that hinders the rise of the door body 13. small. Therefore, in the present embodiment, the occurrence of hindrance to the descent of the door body 13 is detected in a state where the ratio of the decrease in the amount of displacement of the slide shaft 28 to the decrease in the load generated in the sprocket 14 is large, and the door body 13 is detected. The occurrence of the hindrance to the rise is detected in a state where the ratio of the increase in the amount of displacement of the slide shaft 28 to the increase in the load generated in the sprocket 14 is small.
When detecting an abnormality based on the amount of displacement of the slide shaft 28 in this way, by using two types of elastic bodies having different Young's modulus, the detection accuracy can be improved as compared with using one type of elastic body. ..

Next, with reference to FIG. 6, the water gate opening / closing device 50 according to the second embodiment of the present invention in which one end of the chain 51 is not connected to the door body 13 will be described. In the water gate opening / closing device 50, the same components as those of the water gate opening / closing device 10 are designated by the same reference numerals, and detailed description thereof will be omitted.
As shown in FIG. 6, in the water gate opening / closing device 50, one end of the chain 51 hung on the sprocket 14 is connected to the foundation 52 on which the water gate opening / closing device 50 is installed, and the other end is connected to the counterweight 15. ..

In addition to the sprocket 14, the chain 51 is hung with a sprocket 54 connected to the door body 13 via a wire 53. The sprocket 54 moves up and down as the door body 13 moves up and down by the rotational drive of the sprocket 14.
Similar to the water gate opening / closing device 10, the water gate opening / closing device 50 includes a motor 11, a power transmission mechanism 18, a worm wheel 23, a worm 24, a slide shaft 28, a position detecting means 29, and a plurality of positions, as shown in FIGS. It includes a disc spring 35, a plurality of disc springs 36, a bearing member 30, an annular member 37, a cover body 38, and a determination means 41. The presence or absence of an abnormality when the door body 13 is raised and lowered is determined by detecting the amount of deviation of the slide shaft 28 by the position detecting means 29.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not deviate from the gist are within the scope of the present invention.
For example, the first and second elastic bodies do not have to be disc springs, but may be coil springs.
Further, instead of the first and second elastic bodies being in a compressed state and applying an elastic force to the slide shaft, the first and second elastic bodies are in an extended state (extended state) and an elastic force is applied to the slide shaft. May be allowed to act. When the first and second elastic bodies are in the stretched state and an elastic force is applied to the slide shaft, it is necessary to adopt a stretch limiting means for preventing the stretch of the first elastic body from exceeding a predetermined amount. be.

Further, the position detecting means does not need to be in contact with the slide shaft, and for example, a non-contact type position detecting means may be adopted.
The expansion / contraction limiting means does not have to be a cover body in which the first elastic body is arranged inside. For example, the through hole in the center of the disc spring of the first elastic body is inserted, and the axis is the slide shaft. It may be a tubular member along the axis of.

Further, the door body may be hung on a wire instead of a chain. When the door body is hung with a wire, the water gate opening / closing device moves in the axial direction with the motor, the door body, and the drum around which the wire is wound and rotationally driven by the driving force of the motor to raise and lower the door body. A slide shaft that is possibly provided and a force F having a magnitude corresponding to the magnitude of the load generated on the drum acts in the axial direction, a position detecting means for detecting the position of the slide shaft in the axial direction, and the above. A determination means for determining the presence or absence of an abnormality based on the detection of the position detecting means, a first and second elastic bodies for applying an elastic force in a direction opposite to the force F on the slide axis, and the first elastic body. It is provided with expansion / contraction limiting means for preventing the compression or expansion of the body from exceeding a predetermined amount. The Young's modulus of the first elastic body is smaller than the Young's modulus of the second elastic body.

10: Water gate opening / closing device, 11: Motor, 12: Chain, 13: Door body, 14: Sprocket, 15: Counter weight, 16, 17: Driven sprocket, 18: Power transmission mechanism, 20: Sun gear, 21: Planetary gear , 22: Internal gear, 23: Warm foil, 24: Warm, 25: Shaft material, 26, 26a: Gear, 27: Rotating shaft, 28: Slide shaft, 29: Position detecting means, 30, 31, 32, 33: Bearing member, 34: receiving member, 35, 36: countersunk spring, 37: annular member, 38: cover body, 39: manual handle, 40: reduction mechanism, 41: judgment means, 50: water gate opening / closing device, 51: chain, 52: Foundation, 53: Wire, 54: Sprocket

Claims (4)

In a water gate opening / closing device having a motor, a door body suspended from a chain, and a sprocket on which the chain is hung and rotationally driven by being given a driving force of the motor to move the door body up and down.
A slide shaft that is movably provided in the axial direction and in which a force F having a magnitude corresponding to the magnitude of the load generated on the sprocket acts in the axial direction.
A position detecting means for detecting the position of the slide axis in the axial direction, and
A determination means for determining the presence or absence of an abnormality based on the detection of the position detection means,
The first and second elastic bodies that exert an elastic force in the direction opposite to the force F on the slide shaft, respectively.
The first elastic body is provided with an expansion / contraction limiting means for preventing the compression or expansion of the first elastic body from exceeding a predetermined amount.
A floodgate opening / closing device characterized in that the Young's modulus of the first elastic body is smaller than the Young's modulus of the second elastic body. The sluice gate opening / closing device according to claim 1, wherein the first and second elastic bodies are disc springs or coil springs through which the slide shaft is inserted in the center, respectively. In the water gate opening / closing device according to claim 2, in the expansion / contraction limiting means, the first elastic body is arranged inside, and the axial length of the slide shaft is smaller than the natural length of the first elastic body. It is a short cover body, and members A and B are provided on one side and the other side in the axial direction of the slide shaft with the cover body as the center, and the members A and B are provided in the axial direction of the slide shaft of the first elastic body. When the amount of compression reaches a predetermined amount, the cover body is in a state where the one side end portion and the other side end portion in the axial direction of the slide shaft are in contact with the members A and B, respectively, and the first A water gate opening / closing device characterized by preventing further compression of the elastic body. In a water gate opening / closing device having a motor, a door body suspended from a wire, and a drum around which the wire is wound and rotationally driven by being given a driving force of the motor to move the door body up and down.
A slide shaft that is movably provided in the axial direction and in which a force F having a magnitude corresponding to the magnitude of the load generated on the drum acts in the axial direction.
A position detecting means for detecting the position of the slide axis in the axial direction, and
A determination means for determining the presence or absence of an abnormality based on the detection of the position detection means,
The first and second elastic bodies that exert an elastic force in the direction opposite to the force F on the slide shaft, respectively.
The first elastic body is provided with an expansion / contraction limiting means for preventing the compression or expansion of the first elastic body from exceeding a predetermined amount.
A floodgate opening / closing device characterized in that the Young's modulus of the first elastic body is smaller than the Young's modulus of the second elastic body.

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