Dust removal device

Abstract

To provide a dust collector which enables miniaturization, and enables stable dust collection.SOLUTION: A dust collector includes: a lower movable body 41 which is slidable along a lower guide rail 31; an upper movable body 42 which is slidable along an upper guide rail 32; a rake guide 5 which slidably supports a rod-like body 21 of a rake 2 and where an upper end side is rotatably connected to the upper movable body 42 around a horizontal axis X and an opposite upper end side is connected to the lower movable body 41 through a link mechanism 7; and a cylinder device 8 which is arranged on the lower movable body 41 and where a tip of an advancing or retracting rod is connected to the link mechanism 7. The link mechanism 7 has a handle 75, the rod of the cylinder device 8 advances or retracts and thereby the rake guide 5 rotates, and an angle of the rake 2 with respect to a screen 101 changes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dust removal device that removes dust that has accumulated or adhered to a screen at a water intake. [Background technology]

[0002] Screens are installed at water intakes at hydroelectric power plants and other facilities to prevent debris such as trash and driftwood from entering the water intake for power generation. When debris accumulates on the screen, people use rakes, which are poles with rakes attached, to rake the debris up to the top of the screen. However, this dust removal work is hard work and there is a risk of the debris falling into rivers and other areas. For this reason, dust removal machines are usually installed to remove the debris without relying on human labor. However, conventional dust removal machines are large and automated, which means they cannot be installed in places with limited space and are expensive to install. In view of the above circumstances, the applicant of the present application has previously made the following invention and filed a patent application.

[0003] Patent Document 1 discloses an invention entitled "Dust Removal Device" that relates to a dust removal device that removes dust that has accumulated or adhered to a screen at a water intake. The dust removal device, which is an invention disclosed in Patent Document 1, will be explained using the same symbols as in Figure 1 of the document. It comprises a lower moving body 41 that slides freely along the lower guide rail 31, an upper moving body 42 that slides freely along the upper guide rail 32, a rake guide 5 that slidably supports the rod-shaped body 21 of the rake 2, with its upper end connected to the upper moving body 42 so that it can rotate freely around a horizontal axis and its opposite upper end connected to the lower moving body 41 via a link mechanism 7, and a cylinder device 8 that is arranged on the lower moving body 41 and has a rod that moves back and forth and whose tip is connected to the link mechanism 7. As the rod of the cylinder device 8 moves back and forth, the rake guide 5 rotates, changing the angle of the rake 2 relative to the screen 101. According to the invention disclosed in Patent Document 1 having the above configuration, it is possible to provide a dust remover that can be made compact and that can remove dust stably.

[0004] Patent document 2, titled "Rake for dust removal device and dust removal device," discloses an invention relating to a rake for a dust removal device used in a dust removal device to remove debris that has accumulated or adhered to the screen of a water intake, and a dust removal device equipped with this rake for a dust removal device. The invention disclosed in Patent Document 2 has the same functions and effects as the rake for a dust remover in the invention disclosed in Patent Document 1 described above. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-4500 [Patent Document 2] Patent Publication No. 2021-4501 Summary of the Invention [Problem to be solved by the invention]

[0006] The dust removal devices disclosed in Patent Documents 1 and 2 as mentioned above have a simpler structure than conventionally known large dust removal machines, but do not have a drive mechanism for pressing the rake onto the screen when the rake is used to rake up the garbage captured on the screen. In other words, in the dust removal devices disclosed in Patent Documents 1 and 2, when the rake is used to rake up the garbage trapped on the screen, the rake is simply pressed onto the screen by the weight of the rake, rake arms, and their support structure. For this reason, in the case of the inventions disclosed in Patent Documents 1 and 2, when the garbage is rake up, the water flow causes the rake to float up and separate from the screen, which can make it difficult to rake up the garbage efficiently. When the rake is used to rake up rubbish, if the rake moves away from the screen and floats up, the worker may have to lean over the screen from the intake and try to hold the rake down on the screen with his or her hands. In this case, there is a risk that the worker may fall into the intake, which is extremely dangerous. Furthermore, the dust removers disclosed in Patent Documents 1 and 2 have only one rake arm supporting the rake, making it difficult to use a rake with a large horizontal width. In other words, the dust removers disclosed in Patent Documents 1 and 2 require the use of a small, lightweight rake with a small horizontal width. In this case, when the rake is used to rake up the debris captured on the screen, the water flow tends to cause the rake to swing horizontally, i.e., in the direction of movement of the upper or lower moving body. This creates a problem: the debris cannot be efficiently ripped up.

[0007] The present invention has been made to address such conventional circumstances, and its purpose is to provide a dust removal device that can efficiently and safely rake up garbage captured on a screen with a rake and that can simplify the structure of the dust removal device itself. A further object of the present invention is to provide a dust removal device that can firmly press a rake against a screen when the rake is used to rake up the garbage trapped on the screen. [Means for solving the problem]

[0008] The dust remover of the first invention for solving the above problems is a dust remover that rakes up trash accumulated on a screen at a water intake port, and comprises a rake having a rake at the tip of at least one rod-shaped body, a lower guide rail that is provided above the screen and extends along the width direction of the screen, an upper guide rail that is provided above the lower guide rail and extends along the lower guide rail, a lower moving body that is slidable along the lower guide rail, an upper moving body that is slidable along the upper guide rail, and a support that slidably supports the rod-shaped body of the rake. The screen is characterized by comprising a rake guide whose upper end is connected to the upper movable body so as to be rotatable around a horizontal axis and whose opposite upper end is connected to the lower movable body via a link mechanism, a lifting drive means for raising and lowering the rake, and a cylinder device disposed on the lower movable body, the tip of which moves back and forth and is connected to the link mechanism, the link mechanism having a handle for manual operation that is provided directly or indirectly, and as the rod of the cylinder device moves back and forth, the rake guide rotates around the horizontal axis as the base axis, changing the angle of the rake relative to the screen. In the first aspect of the present invention, the rake constituting the rake functions to rake up and remove debris trapped on the screen. The lower guide rail also functions to move the lower moving body in the width direction of the screen, more specifically, horizontally. The upper guide rail also functions to move the upper moving body in the width direction of the screen, more specifically, horizontally. In other words, the upper and lower moving bodies function to move the rake attached to them via a rake guide or the like in the width direction of the screen, more specifically, horizontally. In addition, the rake guide, in conjunction with the operation of the link mechanism, swings the rake rod-shaped body in the circumferential direction around a horizontal axis (rotating axis) as a base axis, and supports the rake rod-shaped body so that it can slide freely along its central axis. The lifting drive means also functions to raise and lower the rake by sliding it along the central axis of the rod-shaped body constituting the rake. The cylinder mechanism also functions to operate the rake so that it bounces up and down in a direction away from the screen around the horizontal axis as a base axis. At this time, the link mechanism has the function of transmitting the power of the cylinder mechanism to the rake guide. When the worker pulls the handle attached to the link mechanism toward himself, the rake of the rake supported by the rake guide via the link mechanism is pressed against the screen. Therefore, according to the first invention described above, the lower and upper movable bodies are slid along the lower and upper guide rails to move the rake to the desired position, and the rake is then raised by the lifting drive means. The rod-shaped body of the rake is supported by the rake guide, allowing the rake to rake up debris trapped on the screen. Furthermore, by moving the rod of the cylinder device back and forth, the angle of the rake guide, i.e., the rake, relative to the screen can be changed via the link mechanism. More specifically, when lowering the rake vertically below the screen, the angle of the rake can be changed so that it moves away from the screen. When using the rake to rake up debris trapped on the screen, the handle attached to the link mechanism can be operated to press the rake against the screen.

[0009] The second invention is a dust removal device that scrapes up garbage that has accumulated on a screen at an intake port, and is characterized by comprising: a rake having a rake at the tip of at least one rod-shaped body; a guide rail that is provided above the screen and extends along the width direction of the screen; a movable body that can run freely along the guide rail; a rake guide that slidably supports the rod-shaped body of the rake, with its upper end connected to the top of the movable body and rotatable around a horizontal axis, and the opposite side of this upper end connected to the bottom of the movable body via a link mechanism; a lifting drive means for raising and lowering the rake; and a cylinder device that is arranged at the bottom of the movable body and has a rod that moves back and forth, the tip of which is connected to the link mechanism, and the link mechanism has a manual handle that is provided directly or indirectly, and as the rod of the cylinder device moves back and forth, the rake guide rotates around the horizontal axis, changing the angle of the rake relative to the screen. The second invention having the above configuration is obtained by replacing the upper and lower guide rails in the first invention with guide rails, and the upper and lower moving bodies with moving bodies. The guide rail in the second invention has the function of moving the moving body in the width direction (horizontal direction) of the screen. The moving body also has the function of moving the rake, which is indirectly attached to the moving body via a rake guide or the like, in the width direction of the screen, more specifically, in the horizontal direction. Furthermore, the functions of the respective configurations of the second invention other than those described above are the same as the functions of the respective configurations of the first invention described above.

[0010] The dust removal device of the third invention is the first or second invention described above, characterized in that the rake has two or more rod-shaped bodies spaced at a desired interval, and each rod-shaped body has a rake guide, a link mechanism, and a handle. The third invention having the above configuration has the same effect as the first or second invention. Furthermore, in the third invention, the rake has two or more rod-shaped bodies spaced at a desired interval, which has the effect of allowing the use of a rake with a large width in the width direction of the screen. Furthermore, by using such a wide rake, the weight of the rake itself becomes relatively large. As a result, according to the third invention, when the rake is used to scoop up the garbage captured on the screen, the rake is effectively prevented from floating away from the screen or from swaying across the width of the screen due to the influence of the water flowing into the water intake. In addition, in the third invention, the rake has two or more rod-shaped bodies, which has the effect of distributing the physical load when operating a large rake to multiple rake guides and link mechanisms. In this case, compared to when only one set of rake guides and link mechanisms is provided, the effect is that the physical load acting on each rake guide and link mechanism is distributed. Therefore, according to the third invention, even when a large and heavy rake is used, the link mechanism can be prevented from being damaged during use of the third invention. Furthermore, in the third invention, each link mechanism is equipped with a handle, and when the worker pulls the handle toward himself, the rake is pressed onto the screen via the link mechanism, rake guide, etc. This prevents the rake from moving away from the screen while raking up trash.

[0011] The fourth invention is a dust removal device according to the first or second invention, characterized in that the rake comprises two or more rod-shaped bodies spaced at a desired interval, each rod-shaped body having a rake guide and a link mechanism, and a connecting body that connects the link mechanisms together to link them, and this connecting body also serves as a handle, or the connecting body has a separate handle. In the fourth invention having the above configuration, the effect of the rake having two or more rod-shaped bodies, and the effect of the rake guide and link mechanism for each individual rod-shaped body, are the same as the effect of the rake having two or more rod-shaped bodies, and the effect of the rake guide and link mechanism for each individual rod-shaped body in the third invention described above. Furthermore, in the fourth aspect of the present invention, the connecting body functions to connect two or more parallel link mechanisms to link them together. Furthermore, by having the connecting body also function as a handle or a separate handle, the number of handles to be operated when pressing the rake against the screen can be reduced compared to the number of link mechanisms.

[0012] The dust removal device of the fifth invention is any one of the first to fourth inventions described above, characterized in that the drive device that drives the cylinder device is connected to the lower moving body so as to be slidable along the lower guide rail, or is connected to the moving body so as to be slidable along the guide rail. The fifth invention having the above configuration has the same effect as the first to fourth inventions. In addition, in the fifth invention, the lower moving body or the moving body has the effect of moving the drive unit together with the movement of the rake.

[0013] The dust removal device of the sixth invention is any one of the first to fifth inventions described above, characterized in that the rod of the cylinder device moves forward or backward to a predetermined position when a predetermined operation is performed and then automatically stops. The sixth invention with the above configuration has the same effect as the first to fifth inventions. In addition, in the sixth invention, when the rod of the cylinder device is operated in a predetermined manner, it moves forward or backward to a predetermined position and then automatically stops, thereby enabling automatic control of the angle of the rake relative to the screen.

[0014] The seventh invention, the dust removal device, is any of the first to sixth inventions described above, characterized in that the lower moving body or the lower part of the moving body is equipped with a cushioning member that cushions the impact caused by the rake coming into contact with it. The seventh invention having the above configuration has the same effect as the first to sixth inventions. In addition, in the seventh invention, the buffering member functions to buffer the impact when the rake comes into contact with the lower moving body or the moving body when the rake is stored. [Effects of the Invention]

[0015] According to the first aspect of the present invention, the rake has at least one rod-shaped body, and each rod-shaped body is supported by a rake guide, so the same structure can be used to hold the rod-shaped body whether the width of the rake that makes up the rake is small or large. As a result, a dust removal device can be provided that has a simple structure but is versatile for various rake widths. In addition, in the first invention, when the rod of the cylinder device moves back and forth, the rake guide rotates around the horizontal axis via the link mechanism, changing the angle of the rake, which reduces the stroke of the rod of the cylinder device and makes it possible to reduce the size of the dust removal device itself. Moreover, because the cylinder device is disposed on the lower moving body, the cylinder device also moves as the lower moving body slides and moves. Therefore, there is no need to provide a separate mechanism for moving the cylinder device, which also makes it possible to reduce the size and simplify the dust removal device itself. Furthermore, in the first invention, by connecting the rake guide to the upper and lower moving bodies, the rake guide can be held in a stable state. The rod-shaped body of the rake is supported in this stable state, allowing the rake to rise and fall, enabling stable lifting and lowering of the rake and stable dust removal using the rake, even in areas with high flow rates or relatively high lifting heights. Similarly, because the cylinder device is disposed in the lower moving body, the center of gravity of the entire dust removal device can be lowered. As a result, according to the first invention, the rake can be raised and lowered in a stable state, which also makes dust removal work safer. Furthermore, according to the first invention, when using a rake to rake up debris captured on a screen, even if the rake floats away from the screen due to the influence of water currents, etc., the worker can keep the rake pressed down on the screen by pulling the handle on the sink mechanism toward himself (toward the worker). In this case, the debris being raked up by the rake can be held firmly between the rake and the screen, allowing for efficient debris removal. Furthermore, according to the first aspect of the present invention, when using a rake to rake up the debris trapped on the screen, the worker does not need to lean over toward the intake port to press the rake onto the screen, which prevents the worker from falling into the intake port during the dust removal work on the screen. Therefore, according to the first aspect of the present invention, safety during the dust removal work of the screen can be significantly improved.

[0016] In the second invention, the upper and lower guide rails in the first invention are replaced with guide rails, and the upper and lower moving bodies are replaced with carriage-like moving bodies. In addition, in the second invention, since the cylinder device is disposed below the moving body, the cylinder device also moves as the moving body moves. Therefore, in the second invention, there is no need to provide a separate mechanism for moving the cylinder device, which makes it possible to make the dust removal device smaller and simpler. Furthermore, the effects of the second invention other than those mentioned above are the same as those of the first invention.

[0017] The third invention has the same effect as the first or second invention described above. Furthermore, according to the third invention, a rake with a rake that is wider in the width direction of the screen can be used. In this case, the weight of the rake itself is relatively large, which reduces the effects of water flow when the rake is raised (movement away from the screen and shaking), while widening the area that can be removed with one raising. In this case, by using the third invention, the dust removal work on the screen can be performed more efficiently and quickly. Furthermore, according to the third invention, when the rake of the rake is enlarged in the width direction of the screen, the physical load acting on the rake guide and link mechanism can be distributed to multiple rake guides and link mechanisms. In this case, even when a rake with a large width is used, the support structure and drive mechanism can be simplified, thereby making it possible to reduce the size of the entire dust removal device, which is the third invention. Furthermore, according to the third invention, each link mechanism is equipped with a handle, so that even when using a rake with a large horizontal width, the operator can press the entire width of the rake against the screen by simply pulling each handle toward them. Therefore, according to the third aspect of the present invention, even when a rake having a large width in the width direction (horizontal direction) of the screen is used, dust removal work can be carried out efficiently and safely.

[0018] The fourth invention has the same effect as the first or second invention. Furthermore, the effect of the fourth invention, which is obtained by the rake having two or more rod-shaped bodies, and the effect of the rake guide and link mechanism for each rod-shaped body, is the same as the effect of the third invention, which is obtained by the rake having two or more rod-shaped bodies, and the effect of the rake guide and link mechanism for each rod-shaped body. Furthermore, according to the fourth invention, the connecting body that connects the link mechanisms together doubles as a handle or is provided with a separate handle, so that the number of handles that need to be operated when pulling multiple link mechanisms closer to the worker can be made smaller than the number of link mechanisms. In this case, the number of workers required to operate the handles can be reduced compared to when a handle is provided for each individual link mechanism. In this case, even if the rakes constituting the rakes are enlarged in the width direction of the screen, the dust removal work on the screen can be carried out safely and efficiently with fewer people.

[0019] The fifth invention has the same effects as the effects of the first to fourth inventions described above. Furthermore, in the fifth invention, which cites the first invention, the drive unit of the cylinder device is connected to the lower moving body, so the drive unit also moves along the lower guide rail as the lower moving body and the cylinder device move. Alternatively, in the fifth invention, which cites the second invention, the drive unit of the cylinder device is connected to the moving body, so the drive unit also moves along the lower guide rail as the lower moving body and the cylinder device move. Therefore, there is no need to provide a mechanism for laying or bundling long cables connecting the cylinder device and the drive device, and the dust removal device of the fifth invention can be made smaller and simpler. In addition, since the drive unit also moves when the lower moving body or moving body, i.e., the rake, is moved, it is possible to reduce the effort required compared to when a person moves the lower moving body or moving body. Furthermore, since the drive unit is arranged on the lower guide rail or on the guide rail side, the center of gravity of the entire device is lowered, allowing for more stable lifting and lowering of the rake and dust removal. Furthermore, according to the fifth invention, since the lower moving body and the drive unit slide independently on the lower guide rail, or the moving body and the drive unit slide independently on the guide rail, it is possible to move the entire device more stably than when the drive unit is disposed or placed on the lower moving body or the moving body.

[0020] The sixth invention has the same effects as the first to fifth inventions described above. Furthermore, according to the sixth invention, when a predetermined operation is performed, the rod of the cylinder device advances or retreats to a predetermined position and automatically stops. For example, when a predetermined operation is performed when lowering the rake, the rod advances or retreats, and stops when the rake is a predetermined distance away from the screen (at the predetermined position). Because the rod automatically stops at the predetermined position, it is possible to always properly control the angle of the rake relative to the screen, and it is possible to reduce the labor required for dust removal compared to when this operation is performed manually.

[0021] The seventh invention has the same effects as the first to sixth inventions. Furthermore, according to the seventh invention, by providing a buffer member, it is possible to buffer the impact caused by the rake contacting the lower moving body or the moving body, especially when storing the rake. Moreover, because this buffering member is provided on the lower moving body or the moving body, it is possible to make the seventh invention smaller and simpler. In other words, there is no need to provide a separate mechanism for moving the buffering member as the rake moves. Also, by providing the buffering member particularly on the lower moving body, the impact when the rake comes into contact can be stably received by the lower guide rail. Alternatively, by providing the buffering member particularly on the moving body, the impact when the rake comes into contact can be stably received by the moving body. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a side view showing a dust removal device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the dust removal device of FIG. [Figure 3] FIG. 2 is a side view showing the installation state of the dust removal device of FIG. [Figure 4] FIG. 2 is a front view showing the installation state of the dust removal device of FIG. [Figure 5] FIG. 2 is a plan view showing the installation state of the dust removal device of FIG. [Figure 6]2 is a plan view showing a lower moving body of the dust remover of FIG. 1 (as seen from BB in FIG. 2). [Figure 7] 2 is a plan view showing an upper moving body of the dust remover of FIG. 1 (as seen from AA in FIG. 2). [Figure 8] 2 is an enlarged view showing the periphery of a link mechanism and a cylinder device of the dust remover of FIG. 1. FIG. [Figure 9] 2 is an enlarged view showing the periphery of an upper support of the dust remover of FIG. 1. FIG. [Figure 10] 2A and 2B are diagrams showing the various positions of the rake of the dust removal device of FIG. 1, where (a) shows the maximum open position and (b) shows the rest position. [Figure 11] 2A and 2B are a front view and a side view, respectively, showing the rake of the dust removal device of FIG. 1; [Figure 12] 12A, 12B, and 12C are a front view, a side view, and a plan view, respectively, of the rake of FIG. 11. [Figure 13] FIG. 13 is a plan view showing the claw plate of the rake of FIG. 12. [Figure 14] 14A and 14B are a front view and a side view showing the rake roller of the rake of FIG. 13. [Figure 15] FIG. 2 is a front view of a dust remover according to a first modified example of the present embodiment. [Figure 16] FIG. 10 is a partial perspective view showing another attachment structure of the handle to a plurality of link mechanisms arranged side by side. [Figure 17] FIG. 10 is a side view of a dust remover according to a second modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] A dust remover according to an embodiment of the present invention will be described with reference to FIGS.

[0024] First, a dust remover (basic form) according to an embodiment of the present invention will be described. 1 and 2 are a side view and a front view showing a dust remover 1A1 according to an embodiment of the present invention, and Figs. 3 to 5 are a side view, a front view and a plan view showing an installation state of the dust remover according to an embodiment of the present invention. As shown in Figures 3 to 5, the dust removal device 1A1 of this embodiment is installed above a water intake 100 of a hydroelectric power plant or the like, and is a device for raking up and removing debris such as garbage and driftwood that has accumulated on a screen 101 arranged in front of the opening of the water intake 100, and is mainly equipped with a rake 2, a lower guide rail 31 and an upper guide rail 32, a lower moving body 41 and an upper moving body 42, a rake guide 5, an electric chain block (lifting drive means) 6, a link mechanism 7, and a cylinder device 8.

[0025] The rake 2 is a rod-shaped body 21 with a rake 22 attached to the tip thereof for scraping off dust and dirt, and will be described in detail later.

[0026] First, the lower guide rail and the upper guide rail will be described with reference to FIGS. As shown in Figures 3 to 5, the lower guide rail 31 is a long rail that is provided above the screen 101 and extends horizontally across the width of the screen 101. Specifically, it is composed of a hollow rod with a rectangular cross section, and is supported by a plurality of poles 33 installed on the water intake platform 102 above the water intake 100, extending horizontally. The height of the lower guide rail 31 is set to, for example, about the waist of an average-sized person so as to prevent people from falling toward the screen 101. Meanwhile, the length of the lower guide rail 31 is appropriately set so that the rake 2 can be moved across the width of the screen 101 to remove dust from the entire surface of the screen 101, as will be described later.

[0027] The upper guide rail 32 is a long rail that is provided above the lower guide rail 31 and extends horizontally along the lower guide rail 31. Specifically, it is composed of a hollow rod with a rectangular cross section, and as shown in FIG. 1, it is supported by an existing net feed frame 103 installed on the water intake platform 102 and arranged to extend horizontally. That is, a plurality of pillar-shaped net feed frames 103 are installed along the width direction of the screen 101, and a rail support member 34 that extends horizontally toward the screen 101 is arranged on each net feed frame 103. The upper guide rail 32 is then arranged and supported by a support portion 35 provided on the upper surface of each rail support member 34.

[0028] This upper guide rail 32 is installed on the water intake platform 102 at a position farther from the screen 101 with respect to the lower guide rail 31. In other words, the lower guide rail 31 and the upper guide rail 32 are arranged like unequal parallel bars, and the inclination direction of the plane including the lower guide rail 31 and the upper guide rail 32 is the same as the inclination direction of the screen 101 plane.

[0029] 4, one end 32a of the upper guide rail 32 is disposed so as to protrude from one end of the lower guide rail 31, and as will be described later, the rake 2 can be stored at this end 32a. Here, this one end 32a is located outside the screen 101, and is an area where dust removal by the rake 2 is not performed. In addition, the other end of the upper guide rail 32 is located at approximately the same position as the other end of the lower guide rail 31.

[0030] Next, the lower moving body will be described in detail with reference to FIG. Fig. 6 is a plan view (viewed from BB in Fig. 2) showing the lower moving body of the dust remover shown in Fig. 1. Note that the same parts as those shown in Figs. 1 to 5 are given the same reference numerals, and explanations of their configurations will be omitted. 6, lower moving body 41 is a moving body that can slide freely along lower guide rail 31, and lower rollers 412 are arranged at each corner of a substantially equilateral triangular lower main plate 411 so as to be rotatable around a vertical axis. With lower guide rail 31 sandwiched between one lower roller 412 and two lower rollers 412, each lower roller 412 rotates, allowing lower moving body 41 to slide (move) freely along lower guide rail 31.

[0031] Additionally, a lower side plate 413 is disposed on the lower main plate 411, facing one side of the lower guide rail 31 (the side opposite the rake 2), and two lateral lock screws 414 are screwed into this lower side plate 413. Then, by turning a lateral lock handle 415 of the lateral lock screw 414 to tighten (press) the lateral lock screw 414 against the lower guide rail 31, the lower moving body 41 can be fixed at any position.

[0032] A pair of opposing first connecting portions 416 are disposed on the upper surface of the lower main plate 411. The first connecting portion 416 is plate-shaped with its plate surface extending in a substantially vertical direction, and rotatably supports one end of a first link 71 (described later) around an axis parallel to the lower guide rail 31. The lower main plate 411 of the lower moving body 41 is provided with a pause lock pin 417 that pauses and stops the dust removal device 1A1 as described later.

[0033] Furthermore, a damping member 418 is disposed on the side of the lower main plate 411 facing the rod-shaped body 21 of the rake 2, located between the two lower rollers 412 and extending in a substantially vertical direction. As will be described later, this damping member 418 damps the impact caused by the rod-shaped body 21 of the rake 2 coming into contact with fixed members (non-movable members) such as the lower moving body 41 and the upper moving body 42 when the rod-shaped body 21 extends substantially vertically, and is disposed so that the rod-shaped body 21 comes into contact with the damping member 418 before coming into contact with the fixed members. This damping member 418 is made of an elastic material such as rubber, and its strength (spring constant) and thickness are set so that it can sufficiently dampen the impact.

[0034] Furthermore, a pair of opposing second connecting portions 419 are arranged on the outer side (opposite the lower guide rail 31 side) of the lower side plate 413. The second connecting portions 419 are plate-shaped with their plate surfaces extending in a substantially vertical direction, and support the base end portion 81 of the cylinder 80 (described later) rotatably about an axis parallel to the lower guide rail 31.

[0035] On the other hand, a support plate 41a facing the other side (the side facing the rake 2) of the lower guide rail 31 is disposed on the lower main plate 411 on the side of one of the lower rollers 412. A connecting hole 41b is formed in the free end (opposite the lower roller 412 side) of this support plate 41a, and the driving device 9, which will be described later, is connected to the lower moving body 41 by inserting a bolt or the like of the driving device 9 into this connecting hole 41b.

[0036] Next, the upper moving body will be described in detail with reference to FIG. Fig. 7 is a plan view (viewed from AA in Fig. 2) showing the upper moving body of the dust removal apparatus shown in Fig. 1. Note that the same parts as those shown in Figs. 1 to 6 are given the same reference numerals, and explanations of their configurations will be omitted. 7, upper moving body 42 is a moving body that can slide freely along upper guide rail 32, and upper rollers 422 are arranged at each corner of a substantially triangular upper main plate 421 so as to be rotatable about a vertical axis. Then, with one upper roller 422 and two upper rollers 422 sandwiching upper guide rail 32, each upper roller 422 rotates, allowing upper moving body 42 to slide (move) along upper guide rail 32. Furthermore, two second upper rollers 423 are arranged on the upper surface of upper main plate 421 so as to be rotatable about a horizontal axis, and these second upper rollers 423 rotate in contact with the upper surface of upper guide rail 32.

[0037] Furthermore, a pair of opposing third connecting portions 424 are disposed on the upper surface of the upper main plate 421. These third connecting portions 424 are plate-shaped with their plate surfaces extending in a substantially vertical direction, and support an upper support body 52 (described later) rotatably about an axis parallel to the upper guide rail 32.

[0038] The lower moving body 41 and the upper moving body 42 are connected by two connecting pillars 43, as shown in FIGS.

[0039] Furthermore, the rake guide and its installation structure will be described with reference to FIGS. As shown in FIG. 1, the rake guide 5 supports the rod-shaped body 21 of the rake 2 so that it can slide freely in the longitudinal direction, and its upper end is connected to the upper moving body 42 so that it can rotate freely around the horizontal axis X (see FIG. 1). The opposite side of this upper end (the side opposite the upper end) is connected to the lower moving body 41 via a link mechanism 7, and mainly comprises a lower support body 51, an upper support body 52, and a rake cover 53.

[0040] Fig. 8 is an enlarged view showing the periphery of the link mechanism and cylinder device of the dust remover shown in Fig. 1. Also, Fig. 9 is an enlarged view showing the periphery of the upper support body of the dust remover shown in Fig. 1. Note that the same parts as those shown in Figs. 1 to 7 are given the same reference numerals, and explanations of their configurations will be omitted. 8, the lower support 51 has two upper support rollers 512 rotatably disposed about a horizontal axis between two lower support plates 511 disposed to sandwich both sides of the rod-shaped body 21 constituting the rake 2. The upper support rollers 512 contact the upper and lower surfaces of the rod-shaped body 21 to support it for rotation, allowing the rod-shaped body 21 to slide (move) freely relative to the lower support 51.

[0041] 9, the upper support body 52 has two upper support rollers 522 rotatably disposed about a horizontal axis between two upper support plates 521 disposed so as to sandwich both side surfaces of the rod-shaped body 21. The upper support rollers 522 contact the upper and lower surfaces of the rod-shaped body 21 to support the rod-shaped body 21 for rotation, thereby allowing the rod-shaped body 21 to slide (move) freely relative to the upper support body 52.

[0042] The upper support plate 521 is provided with a rotation support part 523 that protrudes toward the upper moving body 42, and this rotation support part 523 is connected to the third connecting part 424 of the upper moving body 42 so as to be rotatable around the horizontal axis X. In this way, the upper support body 52, which is the upper end side of the rake guide 5, is connected to the upper moving body 42 and is rotatable around the horizontal axis X.

[0043] The lower support 51 and upper support 52 are connected by a rake cover 53, which is a rod-shaped body with a U-shaped cross section that extends along the rod-shaped body 21, and this rake cover 53 covers the rod-shaped body 21 between the supports 51 and 52. The distance between the lower support 51 and the upper support 52 is set so that even if strong water pressure is applied to the rake 22 of the rake 2, the rod-shaped body 21 of the rake 2 can be stably supported and the rake 22 can stably rake up trash. The lower support 51 side (opposite the upper end side) of the rake cover 53 is connected to the lower moving body 41 via a link mechanism 7, which will be described later.

[0044] Here, the driving mechanism of the rake will be described. In the dust remover 1A1 according to this embodiment, an electric chain block 6 as shown in FIG. 1 is used as a means for raising and lowering the rake 2. The electric chain block 6 is an electric motor that raises and lowers the rake 2, and is disposed on the lower support 51. That is, as shown in FIG. 1, a main body 62 is disposed on the upper surface of the lower support 51 and is positioned at about the waist of a person, and the end of the chain 61 is connected to the connecting member 23 of the rake 2. The rake 2 (rake 22) is raised or lowered by unwinding or rewinding the chain 61. In addition, a push button switch 63 for remotely operating the main body 62 may be disposed on a horizontal bar 431 disposed in the center of the connecting pole 43, for example (see FIG. 1).

[0045] 1 and 4, a cable guide rail 64 extending parallel to the upper guide rail 32 is disposed on the underside of each rail support member 34. As shown in Fig. 2, a plurality of cable pulleys 66 attached to a power cable 65 of the electric chain hoist 6 are movably disposed on this cable guide rail 64, so that the power cable 65 can move and retract along the cable guide rail 64. The electric chain hoist 6 is also provided with an upper limit for defining the upper limit position of the rake 2.

[0046] Furthermore, the link mechanism and the cylinder device will be described with reference to FIG. The link mechanism 7 connects the opposite upper end (the lower end at the center) of the rake guide 5 to the lower moving body 41 so that it can move up and down (rotate). That is, as shown in FIG. 8, one end of a first link 71 is connected to the first connecting portion 416 of the lower moving body 41 so as to be rotatable about a horizontal axis. The other end of this first link 71 is connected to one end of a second link 72 so as to be rotatable about a horizontal axis. Furthermore, the other end of the second link 72 is connected to the free end of a third link 73 attached to the rake cover 53 of the rake guide 5 so as to be rotatable about a horizontal axis. Here, the length of each link 71-73 and the attachment position of the third link 73 and a connecting plate 74 (described later) are set so that the rake guide 5, i.e., the rake 2, rotates by a predetermined angle when a rod 82 of a cylinder device 8 (described later) moves forward and backward, and the stroke of the rod 82 is reduced.

[0047] Furthermore, the link mechanism 7 of the dust remover 1A1 according to this embodiment is provided with a handle 75 for manual operation. That is, as shown in Fig. 8, the handle 75 is fixed integrally to the side surface of the first link 71, the end of which is disposed in the vertical direction in the link mechanism 7. How to use this handle 75 will be described later. The handle 75 may be attached by welding to the side surface of the first link 71, or by using conventionally known fasteners such as bolts and nuts.

[0048] The cylinder device 8 is disposed on the lower moving body 41, and has a tip end 82a of a rod 82 that moves back and forth, connected to the link mechanism 7. That is, in this embodiment, hydraulic pressure is used as the driving source, and as shown in Fig. 8, the rod 82 is movable back and forth in the axial direction relative to the cylinder 80. The base end 81 of this cylinder 80 is connected to the second connecting part 419 of the lower moving body 41 so as to be rotatable about a horizontal axis, and the tip end 82a of the rod 82 is connected to the free end of the connecting plate 74 attached to the first link 71 of the link mechanism 7 so as to be rotatable about the horizontal axis.

[0049] This cylinder device 8 is driven by hydraulic pressure supplied from a drive device 9, and the cylinder device 8 and drive device 9 are connected by cables, pipes, etc. As shown in FIG. 2 above, this drive device 9 has a moving roller 91 disposed at its lower part, and the drive device 9 is able to slide (move) freely along the lower guide rail 31 as this moving roller 91 rotates. In addition, the drive device 9 is detachably connected to the lower mover 41 by inserting a bolt or the like disposed on the drive device 9 into a connecting hole 41b of the lower mover 41 and tightening a nut. As a result, as the lower mover 41, i.e., the cylinder device 8, moves along the lower guide rail 31, the drive device 9 also moves along the lower guide rail 31.

[0050] By operating the operating part of the cylinder device 8 (drive device 9) to move the rod 82 forward or backward, the rake guide 5 rotates about the horizontal axis X on the upper moving body 42 side as the base axis, and the angle of the rod-shaped body 21 of the rake 2 relative to the screen 101 (the distance and contact strength between the rake 22 and the screen 101) can be changed as desired. That is, when the rod 82 advances (extends), the link mechanism 7 operates in the extending direction, and the rake guide 5, i.e., the rake 2, rotates clockwise. Also, when the rod 82 retreats (retracts), the link mechanism 7 operates in the retracting direction, and the rake guide 5, i.e., the rake 2, rotates counterclockwise.

[0051] Here, with reference to FIG. 10, the operation of the rake guide 5 in conjunction with the operation of the cylinder device 8 (drive device 9) will be described. Figure 10 shows the various positions of the rake of the dust collector shown in Figure 1, where (a) shows the fully open position and (b) shows the rest position. Note that the same parts as those shown in Figures 1 to 9 are given the same reference numerals, and the explanation of their configurations will be omitted. For example, when the rod 82 is in the fully extended position where it reaches its top dead center, the inclination angle of the rod-shaped body 21 with respect to the horizontal plane is 67° as shown in FIG. 10(a). Here, the inclination angle of the screen 101 with respect to the horizontal plane is assumed to be 68.2°. On the other hand, when the rod 82 is in the rest position where it reaches its bottom dead center, the inclination angle of the rod-shaped body 21 with respect to the horizontal plane is approximately 80° as shown in FIG. 10(b). At this time, the dust remover 1A1 is brought to a rest stop by inserting the rest lock pin 417 of the lower moving body 41 into a rest hole provided at a predetermined position (rest location) of the lower guide rail 31.

[0052] Furthermore, when the upper moving body 42 is positioned at one end 32a of the upper guide rail 32 (see FIG. 7) (storage position), the lower moving body 41 comes off the lower guide rail 31, the rake guide 5 further rotates counterclockwise, and the rod-shaped body 21 of the rake 2 extends almost vertically due to its own weight (not shown). In this way, the rake 2 is stored at one end 32a of the upper guide rail 32.

[0053] Furthermore, the rod 82 of the cylinder device 8 is adapted to advance or retreat to a predetermined position and automatically stop when a predetermined operation is performed on the operating unit. That is, when a predetermined button operation (first operation) is performed to lower the rake 2, the rod 82 advances and automatically stops at the top dead center, i.e., the open position (see FIG. 10(a)). When a predetermined button operation (second operation) is performed to scrape away trash with the rake 2, the rod 82 retreats until the rake 22 contacts the screen 101 (FIG. 1) and automatically stops. In this state, when the rake 2 rises and exceeds the top end of the screen 101, as will be described later, the rake 2 rotates counterclockwise under its own weight, causing the rod 82 to retreat further and stop at the bottom dead center, i.e., the rest position (see FIG. 10(b)).

[0054] In this embodiment, when the rake 22 is brought into contact with the screen 101 and when it is subsequently raised to the rest position, no hydraulic pressure is applied to the cylinder device 8, and the rake 2 and the rake guide 5 rotate counterclockwise due to their own weight, causing the rod 82 to retract. In other words, hydraulic pressure is applied to the cylinder device 8 only when the rake 2 is lowered, and no hydraulic pressure is applied until the rake 2 is raised to the rest position.

[0055] Next, the structure of the rake will be described with reference to FIGS. FIG. 11 is a front view (a) and a side view (b) of the rake in the dust removal device shown in FIG. 1. FIG. 12 is a front view (a), a side view (b), and a plan view (c) of the rake of the rake shown in FIG. 11. FIG. 13 is a plan view of the claw plate of the rake shown in FIG. 12. In addition, FIG. 14 is a front view (a) and a side view (b) of the rake roller of the rake shown in FIG. 13. Note that the same parts as those shown in FIGS. 1 to 10 are designated by the same reference numerals, and explanations of their configurations will be omitted. As shown in Figure 11, the rake 2 is configured by a rod-shaped body 21 with a rake 22 attached to the tip. The rod-shaped body 21 is configured as a hollow rod with a square cross section, and its length is set so that the rake 22 can move up and down from the bottom end to the top end of the screen 101.

[0056] As shown in Fig. 12, the rake 22 is a mesh-like structure made of elongated beams arranged in a lattice pattern, and is formed in an arc shape (shovel-like). Its size and shape are set so that it can rake up a predetermined amount of garbage accumulated on the screen 101 in one lift. The rake 22 is detachably attached to the rod-shaped body 21. That is, a cylindrical connecting tube 22a is disposed in the center of one end edge (one edge of the arc) of the rake 22, and the rod-shaped body 21 is inserted into this connecting tube 22a and bolted, and then the bolt is released and the rod-shaped body 21 is pulled out, thereby making the rake 22 detachable. When the rod-shaped body 21 and the rake 22 are connected, the connecting tube 22a is disposed so that the rod-shaped body 21 extends tangentially from one end edge of the rake 22, as shown in Fig. 11. In addition, a pillar-shaped body 23a extending approximately perpendicular to the connecting tube 22a is arranged on the back surface of the connecting tube 22a (opposite the surface that scrapes off the dust), and a ring-shaped connecting member 23 for connecting the chain 61 of the electric chain block 6 is attached to the top of this pillar-shaped body 23a.

[0057] Furthermore, a claw plate 220 is attached to the tip side (the other edge side of the arc) of the rake 22. This claw plate 220 is a plate-like body extending along the tip edge of the rake 22, and as shown in Fig. 13, is a long, thin, approximately rectangular shape with a plurality of large claws 221 and small claws 222 formed on one long side. The large claws 221 are long, thin, and protrude largely, and are formed so as to mainly scrape off large debris, and as shown in Fig. 12, a plurality of large claws 221 are formed at approximately the same pitch as the pitch of the vertical members 101a extending vertically of the screen 101.

[0058] The small claws 222 are generally triangular in shape and protrude smaller than the large claws 221, and are formed so as to mainly scrape off small particles of dust between the large claws 221, with multiple small claws being formed between each large claw 221 as shown in Figure 13. These large claws 221 and small claws 222 scrape off large particles of dust while preventing small particles of dust from being scraped off (leaving them behind).

[0059] Two cylindrical rake rollers 24 extending horizontally are disposed on the back surface of the claw plate 220. That is, as shown in FIG. 14 , a pair of roller support plates 241, each of which has a plate-like shape and extends in a substantially vertical direction, are attached to the back surface of the claw plate 220 (the side opposite the surface that scrapes off debris) facing each other. A hole is formed in the center of each roller support plate 241. The rake roller 24 is disposed between the roller support plates 241, and a bolt 242 is inserted into the hole in the roller support plate 241 and into the cylinder of the rake roller 24, and a nut 243 is tightened, thereby rotatably arranging the rake roller 24 around the bolt 242. A pin hole 242a is formed in the threaded tip of the bolt 242, and a lock pin or split pin can be inserted into this pin hole 242a to prevent the bolt 242 from loosening. When the rake 22 protrudes toward the intake platform 102, the rake roller 24 rotates along the intake platform 102, allowing the rake 22 to rotate and move smoothly.

[0060] Next, the dust removal operation by the dust remover 1A1 configured as described above will be described.

[0061] When removing dust accumulated on the screen 101, first, move the rake 2 along the lower guide rail 31 and upper guide rail 32 to the desired dust removal location, then turn the lateral travel lock handle 415 to tighten the lateral travel lock screw 414 to fix the rake 2. Next, as described above, perform the first operation with the operating unit to advance the rod 82 of the cylinder device 8, lay the rake 2 in the open position as shown in Figure 10(a), and move the rake 22 of the rake 2 away from the screen 101 so that it does not come into contact with the dust accumulated on the screen 101.

[0062] In this state, the electric chain block 6 is started and the rake 2 is lowered to the bottom end of the screen 101. Next, as described above, the second operation is performed with the operating unit (the hydraulic pressure is released) to retract the rod 82 of the cylinder device 8 and bring the claw plate 220 of the rake 22 into contact with the screen 101. Next, the electric chain block 6 is started and the rake 22 is raised to the top end of the screen 101. The weight of the rake 2 causes the rake 22 to press against the screen 101 and scrape up the debris, and the debris in the rake 22 is sifted down into the water intake platform 102.

[0063] As described above, in the dust removal device 1A1 of this embodiment, when the rake 22 is brought into contact with the screen 101, no hydraulic pressure is applied to the cylinder device 8, and the rake 22 is pressed onto the screen 101 only by the weight of the rake 2, rake guide 5, etc. For this reason, when the rake 22 of the rake 2 is used to rake up the debris captured on the screen 101, the rake 22 may move away from the screen 101 and float up, making it difficult for the rake 22 to successfully pull up the debris.

[0064] In this case, worker M (see Figure 3 above) standing on the water intake platform 102 can grasp the handle 75 attached to the link mechanism 7 and pull it towards himself, thereby pressing the rake 22 of the rake 2 onto the screen 101 via the rake guide 5 connected to the link mechanism 7. Then, the worker M pulls the handle 75 toward himself (toward his hand), whereby the rake 22 can be pulled up vertically upward while being in close contact with the screen 101. In this case, the rake 22 can be prevented from floating away from the screen 101 during lifting due to the influence of water currents or the like, or from swinging horizontally, so that the dust on the screen 101 can be removed efficiently and reliably.

[0065] On the other hand, in the dust remover 1A1 according to this embodiment, if the link mechanism 7 does not include the handle 75 and the rake 22 separates from the screen 101 during its scraping operation, the worker M may lean out from the lower guide rail 31 and pull the rake guide 5 toward himself in order to prevent the rake 22 from floating (separating) or swinging horizontally. In this case, there is a risk that the worker M may fall toward the water intake 100, and safety during work cannot be sufficiently ensured. In contrast, in the dust remover 1A1 according to this embodiment, the link mechanism 7 is provided with the handle 75, so that the worker M does not need to lean out from the lower guide rail 31 while the rake 22 is raking up the dust. As a result, the dust removal work on the screen 101 can be performed safely.

[0066] Furthermore, when the dust removal operation is to be suspended after the above-described dust removal operation has been performed on all dust removal locations, the rake 2 is positioned in the rest position (FIG. 10(b)) and the cylinder device 8 is stopped, as described above. The rake 2 is then moved to a predetermined rest location on the lower guide rail 31, and the rest lock pin 417 is inserted into the rest hole in the lower guide rail 31 to suspend the dust removal device 1A1. When the dust removal device 1A1 needs to be stored, such as when raising or lowering the netting area, the rake 2 is moved until the upper moving body 42 is positioned at one end 32a of the upper guide rail 32. This disengages the lower moving body 41 from the lower guide rail 31, causing the rod-shaped body 21 of the rake 2 to extend substantially vertically, allowing the rake 2 to be retracted. At this time, when the rod-shaped body 21 extends substantially vertically, it hits the buffer member 418, absorbing the impact on the lower moving body 41 and other components.

[0067] As described above, the dust removal device 1A1 according to this embodiment can significantly reduce the labor and burden on the worker M and significantly shorten the work time compared to when the worker M removes dust entirely by hand. As a result of being able to shorten the time required for dust removal work, it becomes possible to quickly restore water intake and increase the amount of power generation. Furthermore, according to the dust removal device 1A1 of this embodiment, the link mechanism 7 is equipped with a handle 75, which allows for efficient and reliable removal of dust captured on the screen 101, and also significantly improves the safety of the worker M during dust removal work.

[0068] Furthermore, in the dust removal device 1A1 of this embodiment, the rake 2 is particularly composed of a single rod-shaped body 21, and the rod-shaped body 21 is supported by a rake guide 5 extending along the rod-shaped body 21, so that the horizontal width of the rake 22 can be reduced. In this case, the dust remover 1A1 according to this embodiment can be further miniaturized, and the dust remover can be installed even in a place with limited space. Furthermore, in the dust remover 1A1 according to the embodiment, when the rod 82 of the cylinder device 8 moves back and forth, the rake guide 5 rotates via the link mechanism 7, changing the angle of the rake 2. This makes it possible to reduce the stroke of the rod 82 of the cylinder device 8 compared to when the rake guide 5 is rotated directly by the rod 82. This also makes it possible to miniaturize the dust remover 1A1 according to the present embodiment. Moreover, according to the dust remover 1A1 of this embodiment, the cylinder device 8 is disposed on the lower moving body 41, so that the cylinder device 8 also moves as the lower moving body 41 slides and moves. Therefore, there is no need to provide a separate mechanism for moving the cylinder device 8, and this structure also makes it possible to make the dust remover smaller and simpler.

[0069] Furthermore, according to the dust removal device 1A1 of this embodiment, the rake 2 moves up and down while the rod-shaped body 21 of the rake 2 is supported by a stable rake guide 5 connected to the upper moving body 42 and the lower moving body 41, so that the rake 2 can move up and down stably and perform stable dust removal using the rake 2 even in areas with fast flow rates or relatively high lifts. Similarly, according to the dust removal device 1A1 of this embodiment, the cylinder device 8 is arranged on the lower moving body 41, which lowers the center of gravity of the entire dust removal device, allowing for more stable raising and lowering of the rake 2 and dust removal work.

[0070] Furthermore, according to the dust removal device 1A1 of this embodiment, the drive device 9 of the cylinder device 8 is connected to the lower moving body 41, so that the drive device 9 also moves along the lower guide rail 31 as the lower moving body 41 and the cylinder device 8 move. Therefore, there is no need to install a mechanism for laying or bundling long cables or pipes connecting the cylinder device 8 and the drive device 9, and this structure also makes it possible to make the dust removal device 1A1 smaller and simpler. In addition, in the dust remover 1A1 according to this embodiment, the drive unit 9 moves when the lower moving body 41, i.e., the rake 2, is moved, which reduces the labor required by the worker M. Furthermore, because the drive unit 9 is disposed on the lower guide rail 31 side, the center of gravity of the entire dust remover is lowered, allowing for more stable lifting and lowering of the rake 2 and dust removal. Furthermore, in the dust removal device 1A1 according to this embodiment, the lower moving body 41 and the drive unit 9 slide independently on the lower guide rail 31, so that the entire dust removal device can be moved more stably than when the drive unit 9 is disposed or placed on the lower moving body 41.

[0071] Furthermore, in the dust removal device 1A1 according to this embodiment, when a predetermined operation is performed, the rod 82 of the cylinder device 8 advances or retreats to a predetermined position and then automatically stops. For example, as described above, when the first operation is performed to lower the rake 2, the rod 82 advances and stops when the rake 22 is a predetermined distance away from the screen 101 (at the predetermined position). In this way, in the dust removal device 1A1 of this embodiment, the rod 82 automatically stops at a predetermined position, making it possible to always properly control the angle of the rake 2 relative to the screen 101 and reduce the effort required by the worker M.

[0072] In addition, the dust remover 1A1 according to this embodiment is provided with the buffer member 418, which can buffer the impact caused by contact with the rake 2. Moreover, since the buffer member 418 is provided on the lower moving body 41, the entire dust remover can be made smaller and simpler. That is, the dust remover 1A1 according to this embodiment does not need to be provided with a separate mechanism that allows the buffer member 418 to move in accordance with the movement of the rake 2. Also, by providing the buffer member 418 on the lower moving body 41, the lower guide rail 31 can stably receive the impact.

[0073] Furthermore, in the dust removal device 1A1 of this embodiment, the various innovations described above have made it possible to reduce the size and weight of the entire dust removal device, making it easy for the worker M to move and perform dust removal work, and making it easy to use.

[0074] On the other hand, in the dust remover 1A1 according to this embodiment, a plurality of large claws 221 for scraping off large dust particles and small claws 222 for scraping off small dust particles are alternately formed on the claw plate 220 of the rake 22, so it is possible to efficiently scrape off large and small dust particles without missing any (without scraping off) them. Moreover, since a plurality of large claws 221 are formed at approximately the same pitch as the pitch of the vertical members 101a of the screen 101, by arranging the large claws 221 between the vertical members 101a, it is possible to effectively remove dust that has accumulated between the vertical members 101a.

[0075] Here, a first modified example of the dust remover according to this embodiment will be described with reference to FIG. Fig. 15 is a front view of a dust remover according to a first modified example of this embodiment. Note that the same parts as those shown in Figs. 1 to 14 are given the same reference numerals, and description of their configurations will be omitted. The dust removal device 1A2 according to the first modified example of this embodiment may be provided with a rake 2' comprising a plurality of rod-shaped bodies 21 spaced at desired intervals across the width of the rake 22', as shown in FIG. 15. In this case, as shown in FIG. 15, it is advisable to provide a set of a rake guide 5, a link mechanism 7, a lower moving body 41 and an upper moving body 42 for each rod-shaped body 21. In addition, in the dust removal device 1A2 of the first modified example, the electric chain block (lifting and lowering drive means) 6 and the drive device 9 of the cylinder device 8 may be shared for all the equipment for the rod-shaped bodies 21, and only one may be provided for one dust removal device 1A2, or they may be provided individually for each piece of equipment for each rod-shaped body 21 (not shown). Furthermore, in the dust remover 1A2 according to the first modified example, each link mechanism 7 is provided with a handle 75, although this is not particularly shown. In addition, the dust remover 1A2 according to the first modified example has the same configuration as the dust remover 1A1 except for the above, and therefore detailed description thereof will be omitted here.

[0076] In the dust removal device 1A2 of the first modified example described above, the rake 2' has two or more rod-shaped bodies spaced apart at a desired interval, so that a rake 22' having a width W in the width direction (horizontal direction) of the screen 101 that is larger than the width of the rake 22 shown in Figure 11, etc., can be used. In this way, the dust remover 1A2 according to the first modification can handle a larger rake 22', thereby widening the area where dust can be removed in one dust removal operation. As a result, the dust remover 1A2 according to the first modification can provide a dust remover with even greater operational efficiency than the previous dust remover 1A1.

[0077] Furthermore, according to the dust remover 1A2 of the first modified example, the width W of the rake 22' is increased, and therefore the weight of the rake 2' itself is relatively increased. As a result, according to the dust removal device 1A2 of the first modified example, when the rake 22' is used to scoop up the garbage captured on the screen 101, the water flow flowing into the water intake 100 can effectively prevent the rake 22' from moving away from the screen 101 and floating up, or from oscillating in the width direction of the screen 101. Furthermore, the dust remover 1A2 according to the first modification is provided with multiple sets of rake guides 5, link mechanisms 7, etc. as a support structure for the rake 22', making the rake 2' stronger against the lower guide rails 31 and the upper guide rails 32. Therefore, even with this structure, when the rake 22' is raking up trash, it is possible to suitably prevent the rake 22' from floating away from the screen 101 or from swinging in the width direction of the screen 101. Therefore, according to the dust remover 1A2 of the first modified example, the dust removal work of the screen 101 can be performed efficiently from these points as well.

[0078] Furthermore, in the dust removal device 1A2 according to the first modified example, the rake 2' is provided with two or more rod-shaped bodies, so that the physical load when operating the enlarged rake 22' can be distributed to multiple sets of rake guides 5, link mechanisms 7, lower moving bodies 41 and upper moving bodies 42. Therefore, according to the dust remover 1A2 of the first modified example, even if the rake 22' is increased in size and weight, the risk of damage to the drive mechanism during operation of the rake 2' can be reduced. Therefore, the dust remover 1A2 according to the first modification can provide a dust remover that has a simple and compact overall structure while having a large rake 22'. In this case, the dust remover equipped with the large rake 22' can be installed in a small area, and the cost required for installation can be kept low.

[0079] In addition, in the dust removal device 1A2 according to the first variant, each link mechanism 7 is also provided with a handle 75, so that by pulling the handle 75 toward the worker M when lifting the rake 22', dust removal work on the screen 101 can be performed efficiently and safely, as in the case of the dust removal device 1A1 described above.

[0080] In the dust remover 1A2 according to the first modified example, the handles 75 may be individually provided on the link mechanisms 7 as described above, but the dust remover 1A2 may have an attachment structure other than the above. Here, a structure for attaching the handle 75 to the link mechanism 7 other than the above will be described with reference to FIG. Figure 16 is a partial perspective view showing another mounting structure of the handle for a plurality of link mechanisms arranged in parallel. Note that the same parts as those shown in Figures 1 to 15 are given the same reference numerals, and the description of their configurations will be omitted. In the dust remover 1A2 according to the first modified example in which a plurality of link mechanisms 7 are arranged in parallel in the width direction (horizontal direction) of the screen 101, for example, as shown in Fig. 16, a connector 76 may be fixedly installed across the first links 71 constituting each link mechanism 7, and a handle 75 may be fixed to the connector 76. In other words, the handle 75 may be indirectly provided on the first link 71.

[0081] In this case, the first links 71 of the plurality of link mechanisms 7 arranged side by side are integrated by the connector 76, so that the operations of the plurality of link mechanisms 7 can be linked. In this case, while the rake 22' is raking up the garbage, the operator M can simply pull the handle 75 attached to the connecting body 76 toward him / her (see Figure 3 above) to press the entire width of the rake 22' thoroughly onto the screen 101. In this case, the number of workers M required to operate the handles 75 can be reduced compared to when the handles 75 are individually provided on the first links 71 of the link mechanisms 7. As a result, dust removal work on the screen 101 can be carried out efficiently and safely by a small number of people using the large rake 22'.

[0082] In addition, the attachment structure of the handle 75 shown in Figure 16 is explained using an example in which a separate handle is provided on the connecting body 76, but the connecting body 76 itself may be made of a rod-shaped body thick enough to be held by a person's hand, and this rod-shaped connecting body 76 may also be configured to be usable as the handle 75 (not shown). In this case, the connecting body 76 that connects and links the parallel link mechanisms 7 can be used as the handle 75, thereby improving the operability of the dust removal device 1A2 according to the first modified example while simplifying and miniaturizing its structure.

[0083] Finally, a second modified example of the dust remover according to this embodiment will be described with reference to FIG. Fig. 17 is a side view of a dust remover according to a second modified example of this embodiment. Note that the same parts as those shown in Figs. 1 to 16 are given the same reference numerals, and description of their configurations will be omitted.

[0084] In the above-mentioned dust removal devices 1A1 and 1A2, the means for moving the rake 2 and its drive mechanism, the rake guide 5, in the width direction of the screen 101 are explained as examples of the case where the devices are provided with lower guide rails 31 and upper guide rails 32, and lower moving bodies 41 and upper moving bodies 42, but structures other than these may also be used as means for moving the rake 2 and rake guide 5. More specifically, a dust removal device 1B (see Figure 17) may be provided in which guide rails 36 are provided instead of the lower guide rails 31 and upper guide rails 32 in the above-mentioned dust removal devices 1A1 and 1A2, and a moving body 44 (cart) is provided instead of the lower moving body 41 and upper moving body 42.

[0085] In the dust removal device 1B of the second modified example as described above, a moving body 44 carrying a rake 2 and its drive mechanism, i.e., a rake guide 5 and a link mechanism 7, is configured to move on a pair of guide rails 36 laid in the width direction of a screen 101 at a water intake platform 102 provided on a water intake port 100, so that the rake 2 and rake 2' can be used to remove dust captured on the screen 101. Furthermore, in the dust removal apparatus 1B relating to the second modified example as described above, in the previous dust removal apparatuses 1A1 and 1A2, all of the equipment that moves in conjunction with the lower moving body 41 and the upper moving body 42 is configured to move on the guide rail 36 together with the moving body 44.

[0086] More specifically, in the dust removal device 1B according to the second modified example as described above, the upper support 52 of the rake guide 5 is attached to the upper part 441 of the moving body 44 so as to be rotatable about the horizontal axis X, and the lower support 51 side of the rake guide 5 is attached to the lower part 442 of the moving body 44 via the link mechanism 7 and the cylinder device 8. Furthermore, the moving body 44 may be provided with wheels 45 for running on the guide rails 36 as necessary, or may be configured to be able to slide directly on the guide rails 36 .

[0087] In addition, when the dust remover 1B according to the second modified example as described above is provided with the rake 2 as shown in FIG. 11, the link mechanism 7 thereof is provided with a handle 75. Furthermore, when the dust removal device 1B according to the second modified example is equipped with a rake 2' as shown in Figure 15 above, a handle 75 is provided individually on each link mechanism 7 provided corresponding to a plurality of rod-shaped bodies 21, or a handle 75 is provided on a connecting body 76 provided to link a plurality of link mechanisms 7 arranged side by side.

[0088] The dust remover 1B according to the second modified example as described above provides the same functions and effects as the dust removers 1A1 and 1A2 described above.

[0089] While the above describes an embodiment of the present invention, the specific configuration is not limited to the above embodiment, and design changes that do not deviate from the gist of the present invention are also included in the present invention. For example, in the above embodiment, the driving source for the cylinder device 8 is hydraulic, but other driving sources such as air pressure may also be used. Furthermore, the link mechanism is not limited to the above link mechanism 7, and any link mechanism may be used as long as the rake guide 5, i.e., the rake 2, rotates by a predetermined angle and the stroke of the rod 82 is reduced. Furthermore, a stopper may be provided to restrict the movement of the link mechanism 7 so that the angle of the rake 2 relative to the screen 101 can always be appropriately controlled. [Explanation of symbols]

[0090] DESCRIPTION OF SYMBOLS 1A1, 1A2, 1B...Dust removal device 2, 2'...Rake 21...Rod-shaped body 22, 22'...Rake 220...Claw plate 221...Large claw 222...Small claw 22a...Connecting tube 23...Connecting member 23a...Column-shaped body 241...Roller support plate 24...Rake roller 242...Bolt 242a...Pin hole 243...Nut 31...Lower guide rail 32...Upper guide rail 32a...One end 33...Pole 34...Rail support material 35...Support part 36...Guide rail 41...Lower moving body 41a...Support plate 41b...Connecting hole 411...Lower main plate 412...Lower roller 413...Lower side plate 414...Traverse lock screw 415...Traverse lock handle 416...First connecting part 417...Rest lock pin 418...Relief member 419...Second connecting portion 42...Upper moving body 421...Upper main plate 422...Upper roller 423...Second upper roller 424...Third connecting portion 424...Connecting portion 43...Connecting column 431...Horizontal bar 44...Moving body 441...Upper portion 442...Lower portion 45...Wheel 5...Rake guide 51...Lower support 511...Lower support plate 512...Upper support roller 52...Upper support 521...Upper support plate 522...Upper support roller 523...Rotation support portion 53...Rake cover 6...Electric chain hoist (lifting drive means) 61...Chain 62...Main body 63...Push button switch 64...Cable guide rail 65...Power cable 66...Cable pulley 7...Link mechanism 71...First link 72...Second link 73...Third link 74...Connecting plate 75...Handle 76...Connecting body 8...Cylinder device 80...Cylinder 81...Base end portion 82...Rod 82a...Tip portion 9...Drive device 91...Moving roller 100...Water intake port 101...Screen 101a...Vertical member 102...Water intake platform 103...Net stand M...Worker X...Horizontal axis

Claims

1. A dust removal device that scrapes up debris that has accumulated on the screen of the water intake, a rake comprising two or more rod-shaped bodies provided at desired intervals and each having a rake at the tip thereof; a lower guide rail provided above the screen and extending along the width direction of the screen; an upper guide rail provided above the lower guide rail and extending along the lower guide rail; a lower moving body that is slidable along the lower guide rail; an upper moving body that is slidable along the upper guide rail; A rake guide that individually supports the rod-shaped bodies of the rake so that they can slide freely, and has an upper end connected to the upper moving body so that it can rotate freely around a horizontal axis, and an opposite side of the upper end connected to the lower moving body via a link mechanism; A lifting drive means for lifting and lowering the rake; a cylinder device disposed on the lower moving body, the tip end of a rod that moves back and forth being connected to the link mechanism; A connecting body that connects and links the link mechanisms that constitute the individual rake guides, The connecting body doubles as a handle for manual operation, or the connecting body has a separate handle, A dust removal device characterized in that the rod of the cylinder device moves back and forth, causing the rake guide to rotate about the horizontal axis as a base axis, thereby changing the angle of the rake relative to the screen.

2. A dust removal device that scrapes up debris that has accumulated on the screen of the water intake, a rake comprising two or more rod-shaped bodies provided at desired intervals and each having a rake at the tip thereof; a guide rail provided above the screen and extending along the width direction of the screen; a moving body that is free to travel along the guide rail; A rake guide that individually supports the rod-shaped bodies of the rake so that they can slide freely, and has an upper end connected to the upper part of the moving body so that it can rotate freely around a horizontal axis, and an opposite side of the upper end connected to the lower part of the moving body via a link mechanism; A lifting drive means for lifting and lowering the rake; a cylinder device disposed under the movable body, the tip of which of a rod that moves back and forth being connected to the link mechanism; A connecting body that connects and links the link mechanisms that constitute the individual rake guides, The connecting body doubles as a handle for manual operation, or the connecting body has a separate handle, A dust removal device characterized in that the rod of the cylinder device moves back and forth, causing the rake guide to rotate about the horizontal axis as a base axis, thereby changing the angle of the rake relative to the screen.

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