Lifting device

Abstract

The present invention provides a lifting device that prevents the lifting bearing from rotating together with other components using a simple structure. [Solution] The lifting device 1 comprises a rectangular parallelepiped main body case 4, a rotating shaft 5 housed inside the main body case 4, a bearing 6 that supports the upper part of the rotating shaft 5, a lifting bearing 7 that is screwed into the lower part of the rotating shaft 5 and moves up and down in conjunction with the rotation of the rotating shaft 5, a lifting shaft 8 connected to the lifting bearing 7 and moves up and down in conjunction with the lifting movement of the lifting bearing 7, a motor 9 connected to the rotating shaft 5 and causing the rotating shaft 5 to rotate, a control unit 10 that houses the motor 9 and controls the entire lifting device 1, and a support member 11 that fixes the lifting device 1 to the drainage device 2. The lifting bearing 7 is provided with an anti-rotation plate 13 that engages with the inner wall of the main body case 4 to restrict the rotation of the lifting bearing 7 around its axis.

Description

[[TECHNICAL FIELD]]

[0001] The present invention relates to a lifting device that is installed in a drainage device provided in a rice paddy having a mechanism for adjusting a water level by displacement of a water level adjusting pipe, and that moves the water level adjusting pipe up and down. [[BACKGROUND ART]]

[0002] Conventionally, there has been known a lifting device that is installed in a drainage device that adjusts the water level of a rice paddy according to the vertical position of a water level adjusting pipe, and that moves the water level adjusting pipe up and down. In a lifting device, when a configuration is adopted in which rotating a shaft causes a lifting bearing that supports the shaft to move up and down along the shaft, a structure for preventing the lifting bearing and the water level adjusting pipe connected to the lifting bearing from rotating together with the rotation of the shaft is known. For example, Patent Document 1 describes a configuration in which two rod-shaped members are provided extending from an actuator that rotates a shaft to the water level adjusting pipe to prevent co-rotation. [[PRIOR ART DOCUMENT]] [[PATENT DOCUMENT]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Application Publication No. 2020-058373 [[SUMMARY OF THE INVENTION]] [[Problem to be Solved by the Invention]]

[0004] However, the co-rotation prevention mechanism in the lifting device described in Patent Document 1 requires provision of a rod-shaped member extending from the actuator to the water level adjusting pipe. When installing the lifting device on an existing drainage device, it is necessary to provide a rod-shaped member matched to the dimensions of the drainage device, which causes a problem of increased cost. There was also a problem that the number of work steps for installation on a drainage device increases.

[0005] Therefore, the object of the present invention is to provide a lifting device that can prevent the lifting bearing from rotating together with the lifting bearing using a simple structure. [Means for solving the problem]

[0006] To achieve the above objective, the invention described in claim 1 is a lifting device for installation in a drainage device having a water level adjustment pipe installed in a rice paddy, for raising and lowering the water level adjustment pipe, comprising a main body case, a rotating shaft that extends vertically and is rotatably housed inside the main body case, a lifting bearing that is screwed onto the rotating shaft and moves up and down along the rotating shaft as the rotating shaft rotates, and a lifting shaft connected to the lifting bearing and moves up and down in conjunction with the lifting and lowering movement of the lifting bearing, wherein the lifting bearing is provided with an anti-rotation plate that engages with the inner wall of the main body case to restrict the rotation of the lifting bearing around its axis, the water level adjustment pipe is connected to the lifting shaft, and the water level adjustment pipe is raised and lowered by the lifting bearing and the lifting shaft moving up and down as the rotating shaft rotates. Furthermore, the invention described in claim 2 is characterized in that, in the invention described in claim 1, a height adjustment mechanism having a height-adjustable joint portion is provided, and the height of the joint portion can be adjusted to match the installation position of the drainage device. [Effects of the Invention]

[0007] According to the present invention, the lifting bearing, lifting shaft, and water level adjustment pipe are configured to move up and down in conjunction with the rotation of the rotating shaft. When the lifting bearing, lifting shaft, and water level adjustment pipe move up and down, the anti-rotation plate engages with the inner wall of the main body case, thereby preventing the lifting bearing from rotating along with the rotation of the rotating shaft. Therefore, since the water level adjustment pipe can be raised and lowered without any forces other than vertical movement, such as rotation around its axis, the load on the water level adjustment pipe and the drainage system having the water level adjustment pipe can be minimized. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the lifting device according to the present invention installed in a drainage system. [Figure 2] This is a front view showing the lifting device according to the present invention installed in a drainage system. [Figure 3] This is a central longitudinal section of Figure 2. [Figure 4] This is a reference perspective view showing a lifting device with some parts omitted. [Figure 5] This is a side view showing an example of a modified lifting device. [Figure 6] This is a perspective view showing an example of a modified lifting device. [Modes for carrying out the invention]

[0009] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 show the lifting device 1 according to the present invention installed in the drainage device 2, with Figure 1 being a perspective view and Figure 2 being a front view. Figure 3 is a central vertical cross-sectional view of Figure 2. Note that the internal structure of the motor 9 and control unit 10 is omitted in Figure 3. Figure 4 is a reference perspective view showing the lifting device 1 with some parts omitted, and is shown by seeing through the front and left side of the main body case 4. Note that the directions in the drawings are indicated as the directions when the lifting device 1 is installed in the drainage device 2.

[0010] As shown in Figures 1 to 3, the lifting device 1 is installed in the drainage device 2 and is a device that moves the water level adjustment pipe 3 up and down. The lifting device 1 has a rectangular parallelepiped main body case 4, a rotating shaft 5 housed inside the main body case 4, a bearing 6 that supports the upper part of the rotating shaft 5, a lifting bearing 7 that is screwed into the lower part of the rotating shaft 5 and moves up and down in conjunction with the rotation of the rotating shaft 5, a lifting shaft 8 connected to the lifting bearing 7 and moves up and down in conjunction with the lifting movement of the lifting bearing 7, a motor 9 connected to the rotating shaft 5 and causing the rotating shaft 5 to rotate, a control unit 10 that houses the motor 9 and controls the entire lifting device 1, and a support member 11 that fixes the lifting device 1 to the drainage device 2.

[0011] As shown in Figure 4, the rotating shaft 5 is a screw shaft housed inside the main body case 4, rotatably supported at its upper end by a bearing 6 and at its lower end by a lifting bearing 7, and held in the vertical direction. The bearing 6 is fixed to the top plate 12 of the support member 11. The lifting bearing 7 is screwed onto the rotating shaft 5 and is a bearing that moves up and down along the rotating shaft 5 inside the main body case 4 as the rotating shaft 5 rotates. The lifting bearing 7 is provided with an anti-rotation plate 13 to prevent it from rotating in conjunction with the rotation of the rotating shaft 5. The lifting shaft 8 is provided connected to the lower part of the lifting bearing 7 so as to extend below the main body case 4. The lifting shaft 8 moves up and down in conjunction with the lifting movement of the lifting bearing 7. The lifting shaft 8 is also directly connected to the water level adjustment pipe 3 when the lifting device 1 is installed in the drainage device 2. The control unit 10 houses a motor 9 that rotates the rotating shaft 5, and also includes a drive unit (not shown) that controls the rotation direction and speed of the motor 9, and a calculation unit (not shown) that adjusts the lifting distance of the lifting device 1. When a user sends an instruction to the control unit 10, the control unit 10 starts controlling the motor 9 and operates it. Instructions to the control unit 10 may be made by a separately provided operating unit, or by a terminal such as a personal computer via remote communication. Examples of separate operating units provided to the control unit 10 include lifting buttons and an operation panel.

[0012] The anti-rotation plate 13 is provided on the lifting bearing 7 and is a component that restricts the rotation of the lifting bearing 7 around its axis by engaging with the inner wall of the main body case 4. The anti-rotation plate 13 has a square shape that matches the shape of the inner wall of the main body case 4 so that it engages with the inner wall of the main body case 4. Therefore, when the lifting bearing 7 moves up and down in conjunction with the rotation of the rotating shaft 5, the anti-rotation plate 13 restricts the rotation around its axis, preventing the lifting bearing 7 from rotating along with the rotation of the rotating shaft 5.

[0013] Furthermore, a lowering stopper 14 is provided at the bottom of the main body case 4. The lowering stopper 14 is a component that, by contacting the bottom surface of the anti-rotation plate 13, restricts the movement of the lifting bearing 7 below the main body case 4 when it performs a downward movement. In this embodiment, the lowering stopper 14 is made of a bolt, but any component that has a similar effect is acceptable in its specific configuration.

[0014] The drainage device 2 is installed near a drainage channel (not shown) in a rice paddy to adjust the water level in the paddy to a constant level and to drain any water exceeding a certain level into the drainage channel. The drainage device 2 has a box N installed near the drainage channel in the paddy, and a drain pipe 21 that is L-shaped in side view, extending from an upward-opening hole to an upward-opening hole that connects to the drainage channel. The drain pipe 21 is fixed to the box N. The drainage device 2 also has a water level adjustment pipe 3 installed inside the upward-extending portion of the drain pipe 21, which is movable up and down above the drain pipe 21. The water level adjustment pipe 3 has a cylindrical adjustment pipe body 24 with openings at the top and bottom, and a handle 25 provided on the upper part of the adjustment pipe body 24. The water level in the paddy is adjusted by changing the height of the water level adjustment pipe 3.

[0015] The following describes how to install the lifting device 1 to the drainage device 2, and how to operate the lifting device 1. The main body case 4 of the lifting device 1 is fixed to the drainage device 2's basin N via a support member 11, and the lifting shaft 8 is connected to the handle 25 of the water level adjustment pipe 3, thereby installing the lifting device 1 to the drainage device 2. Then, the motor 9 rotates the rotating shaft 5, and as the rotating shaft 5 rotates, the lifting bearing 7 moves up and down, causing the lifting shaft 8 and the water level adjustment pipe 3 connected to the lifting shaft 8 to move up and down in conjunction. In this way, the lifting device 1 raises and lowers the water level adjustment pipe 3 of the drainage device 2, and the water level in the rice paddy is adjusted.

[0016] According to the lifting device 1 described above, the rotating shaft 5 is rotated by the motor 9, and the lifting bearing 7, the lifting shaft 8, and the water level adjusting pipe 3 perform lifting operations along with the rotation of the rotating shaft 5. When the lifting bearing 7, the lifting shaft 8, and the water level adjusting pipe 3 perform the lifting operation, the rotation preventing plate engages with the main body case, thereby making it possible to prevent co-rotation caused by the rotation of the rotating shaft 5 from occurring. Therefore, the water level adjusting pipe 3 can be moved up and down without applying a force other than the lifting operation such as rotation around the axis to the water level adjusting pipe 3, so that the load applied to the water level adjusting pipe 3 and the drainage device having the water level adjusting pipe 3 can be minimized.

[0017] (Modified Example of Lifting Device) FIGS. 5 and 6 are diagrams showing a lifting device 1A which is a modified example of the lifting device 1 provided with a height adjusting mechanism 30, wherein FIG. 5 is a side view and FIG. 6 is a perspective view. Note that components that exhibit the same effects as those shown in FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4, and descriptions thereof are omitted. Also, in FIGS. 5 and 6, the motor 9 and the control unit 10 are omitted.

[0018] As shown in FIGS. 5 and 6, the lifting device 1A is provided with a height adjusting mechanism 30 at the rear. The height adjusting mechanism 30 includes a cylindrical joint portion 31 provided extending downward from the top plate 12, and a fixing plate 32 that fixes the lower portion of the joint portion 31 and can be attached to the drainage device 2. The joint portion 31 includes an outer cylinder 33 whose lower portion is fixed to the fixing plate 32, an inner cylinder 34 which is inserted into the outer cylinder 33 so as to be vertically movable and whose upper portion is fixed to the top plate 12, and a fixing member 35 that restricts the vertical movement of the inner cylinder 34 after positioning the inner cylinder 34. Then, by adjusting the height of the joint portion 31 in accordance with the height at which the drainage device 2 and the water level adjusting pipe are installed, the lifting device 1A is installed in the drainage device 2.

[0019] According to the lifting device 1A described above, by adjusting the height of the joint portion 31 of the height adjusting mechanism 30, the lifting device 1A can be installed in accordance with the installation height of the drainage device 2. Therefore, it is possible to install the lifting device 1A on various drainage devices 2 without having to adjust the dimensions of the lifting device 1A to match the mounting height of the drainage device 2.

[0020] Furthermore, the lifting device according to the present invention is not limited in any way to the embodiments described above, and the overall configuration of the lifting device, as well as components such as the anti-rotation plate, can be modified as needed.

[0021] For example, in this embodiment, the main body case 4 is rectangular in shape, and the anti-rotation plate 13 is square in shape so as to engage with the inner wall of the main body case 4. However, the shape of the main body case 4 and / or the anti-rotation plate 13 can be changed as appropriate, as long as the anti-rotation plate 13 engages with the inner wall of the main body case 4 to restrict the rotation of the lifting bearing 7 around its axis. [Explanation of Symbols]

[0022] 1. Lifting device, 2. Drainage device, 3. Water level adjustment pipe, 4. Main case, 5. Rotating shaft, 6. Bearing, 7. Lifting bearing, 8. Lifting shaft, 9. Motor, 10. Control unit, 11. Support member, 12. Top plate, 13. Anti-rotation plate, 14. Lowering stopper, 21. Drain pipe, 24. Adjustment pipe main body, 25. Handle, 30. Height adjustment mechanism, 31. Joint part, 32. Fixing plate, 33. Outer cylinder, 34. Inner cylinder, N. Measuring cup.

Claims

1. A lifting device installed in a drainage system having a water level adjustment pipe in a rice paddy, which raises and lowers the water level adjustment pipe, The device comprises a main body case, a rotating shaft that extends vertically and is rotatably housed inside the main body case, a lifting bearing that is screwed onto the rotating shaft and moves up and down along the rotating shaft as the rotating shaft rotates, and a lifting shaft connected to the lifting bearing and moves up and down in conjunction with the lifting movement of the lifting bearing. The lifting bearing is provided with an anti-rotation plate that engages with the inner wall of the main body case to restrict rotation around the axis of the lifting bearing. A lifting device characterized in that the water level adjustment pipe is connected to the lifting shaft, and the lifting bearing and the lifting shaft move up and down as the rotating shaft rotates, thereby raising and lowering the water level adjustment pipe.

2. A height adjustment mechanism is provided, which has a joint part that allows for height adjustment. The lifting device according to claim 1, characterized in that it is possible to adjust the height of the joint portion to match the installation position of the drainage device.

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