Dust removal device

Abstract

To provide a dust remover which allows a screen after a dust removal work to be seen on water, hardly causes breakage or rust of scraper that is generally weaker than the screen, has high dust removal workability, and is easy to maintain.SOLUTION: In a dust removal work, a screen 14 is raised from a water surface of a water passage 11 along both guide rails 15 using an electric winch 16, and then a scraper 18 is moved by a cam mechanism 19, to arrange each scraping claw 17 at a dust scraping position P. Dust is then scraped off by each scraping claw 17 while the screen 14 is being lowered. Therefore, dust removal work can be performed on the ground while utilizing a self-weight of the screen 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dust removal device that removes dust such as dead leaves and plastic from flowing water in a waterway. [Background technology]

[0002] For example, a dust removal device such as that disclosed in Patent Document 1 is known as a device for removing dust mixed in water flowing through a waterway or the like used as a water intake facility for small hydroelectric power generation. This dust removal device is placed in the waterway and is equipped with a fixed lattice frame screen with multiple dust removal grates arranged parallel to each other and spaced apart, a rake (scraper) that uses claws to scrape up the dust captured on the screen, and an electric winch (lifting means) that raises and lowers the rake.

[0003] During dust removal, when a predetermined amount of dust is trapped on the screen, the electric winch is driven to raise the rake waiting at the bottom of the screen along the surface of the screen, and the dust adhering to the screen is scraped up and removed by the rake's claws. This allows the dust trapped on the screen to be removed automatically. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-177448 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] However, in conventional dust removal devices, the removal of dust from the screen is carried out underwater, which poses the following problems. (1) With conventional equipment, dust removal was performed below the water surface, which made it difficult to remove dust. This meant that dust trapped on the screen due to the influence of the water current could not be adequately removed. (2) In addition, with conventional equipment, the rake must be kept waiting under a screen placed below the water surface of the waterway. This makes the metal rake prone to rust and also increases the risk of damage to the rake when rubble or other debris washes into the waterway during heavy rain.

[0006] (3) Furthermore, when performing dust removal work in a waterway with a fast current, for example, the work of raising a submerged rake with an electric winch to scrape up the dust on the screen surface can easily place an unexpected load on the rake, which can make it difficult to remove the dust smoothly. (3) Furthermore, when dust removal work is performed using a rake underwater, the dust tends to scatter in the water as it is being raked up, and there is a risk that the dust that was supposed to have been removed will be caught again by the screen. (4) In addition, when the rake was damaged, for example, by plastic sheets or branches getting tangled in it, or by rust or debris, repair work had to be done below the surface of the waterway, which was hard work and involved getting clothes wet.

[0007] As a result of extensive research, the inventor discovered that if the screen that has captured the dust is raised above the water surface of the waterway by raising and lowering the screen, and then the scraper is moved by the scraper moving means so that the multiple scraping claws (rakes) attached to the scraper are positioned at the dust scraping position on the screen, and in this state the screen is returned below the water surface by the screen lifting means, the dust captured on the screen can be removed on land using the screen's own weight, thereby solving all of the above-mentioned problems, and he completed this invention.

[0008] The present invention has been made in consideration of these problems, and aims to provide a dust removal device that allows the screen to be seen on the water after dust removal work, that is less likely to break or rust as the scraper is generally weaker than the screen, that provides high dust removal workability, and that is easy to maintain. [Means for solving the problem]

[0009] The invention described in claim 1 comprises a lattice-frame screen arranged in a waterway and having a plurality of dust removal grates arranged in a spaced-apart, parallel relationship to the left and right sides; a pair of left and right guide rails attached to the waterway for guiding the screen as it rises and falls between a lowered position at which dust is captured from water flowing through the waterway and an elevated position above the water surface of the waterway; a screen lifting / lowering means for lifting and lowering the screen along the guide rails; a scraper having a plurality of scraping claws inserted between adjacent dust removal grates and spaced apart in a parallel relationship to the left and right sides to scrape off the dust captured on the screen; and a scraper moving means for moving the scraping claws away from the screen when the screen is raised, and for moving the scraping claws close to the screen to a dust scraping position at which the dust captured on the screen can be scraped off when the screen is lowered. At the same time, The scraper moving means is a cam mechanism provided on the screen and having a long linear cam extending in the direction of raising and lowering the screen, and a follower provided on a base to which both guide rails are fixed and operated by the contact and separation of the linear cam, The dust removal device has a link structure in which the follower moves each scraping claw of the scraper away from the screen while the linear cam is in contact with the screen when the screen is raised, and moves each scraping claw of the scraper close to the dust scraping position at least while the linear cam is in contact with the screen when the screen is lowered, The screen that has captured the dust is raised above the water surface of the waterway by raising and lowering the screen, and then the scraper is moved to a dust scraping position above the water surface by the scraper moving means, and the dust is removed by utilizing the weight of the screen when it is lowered, and the screen is returned below the water surface. .

[0010] The type of waterway is not limited. For example, in addition to waterways used as water intake facilities for small hydroelectric power generation, various types of agricultural waterways, various types of industrial waterways, various types of waterways for water supply, etc. can be used. The screen may be made of any material, including, for example, various metals such as iron, steel, and aluminum alloys. The shape of the screen may be any as long as it is a lattice frame-like shape in which a plurality of dust removal gratings extending in the vertical direction are arranged in a spaced apart, parallel relationship to the left and right. The size of the screen is preferably large enough to cover the entire width (left and right) of the waterway.

[0011] The number of guide rails is usually two, which can be placed on both sides of the waterway in the width direction, but three or more may be used as long as the screen can be raised and lowered. The type of screen lifting means is arbitrary, and may be a manual type such as a hand winch or a manual rack jack, or an automatic type such as an electric winch or a motor-driven screw feed device. The scraper may be made of any material, including various metals such as iron, steel, and aluminum alloys. The shape of the scraper may be any shape as long as it has a plurality of scraping claws extending in the vertical direction and spaced apart in parallel on the left and right.

[0012] The structure of the scraper moving means may be any as long as it can move each scraping claw away from the screen when the screen is raised, and move each scraping claw close to the screen to a dust scraping position where dust trapped on the screen can be scraped off when the screen is lowered. For example, various cam mechanisms, various jack mechanisms, various motor-driven moving mechanisms, etc. can be used. Of these, a cam mechanism that can be operated by using the lifting and lowering force of the screen is particularly preferred. The scraper may be moved by the scraper moving means in any direction, for example, a rotational direction, a linear direction, or a curved direction. The "dust scraping position" referred to here is the position on the surface of the screen (the surface facing upstream of the waterway) where the dust trapped on the screen can be scraped off by each scraping claw.

[0014] Claim 2The invention described in the above relates to a scraper, the base end of which is journalled via a horizontal shaft to a portion of the frame on the upstream side of the guide rails in the waterway, and the follower comprises a first link, the upper part of which is journalled via a first horizontal pin to a portion of the frame on the downstream side of the guide rails in the waterway, a second link, the middle part of which is journalled via a second horizontal pin to the upper end of the first link, and a third link, the one end of which is journalled via a third horizontal pin to the lower end of the first link, and the other end of which is journalled to the upper part of the scraper via a fourth horizontal pin; and a cam abutment roller, which abuts against the linear cam during lifting and lowering, is journalled at the end of the second link on the upstream side of the waterway in the lengthwise direction, and a cam abutment roller, which abuts against the linear cam during lifting and lowering, is journalled at the end of the second link on the downstream side of the waterway in the lengthwise direction. a weight is connected to the end of the second link on the cam contact roller side so as to constantly rotate upward around the second horizontal pin; a second link rotation restriction stopper is protruded from an upper portion of the first link to restrict the rotation of the second link around the second horizontal pin to an angle at which the cam contact roller moves away from the linear cam during elevation by the action of the weight when the screen is raised or lowered; and a first link rotation restriction stopper is protruded from a portion of the frame downstream of the guide rails of the waterway to restrict the rotation of the first link so that each scraping claw of the scraper, which rotates in conjunction with the rotation of the first link via the third link, maintains the dust scraping position when the screen is lowered. Claim 1 2. The dust removal device according to claim 1.

[0015] Claim 3 The invention described in is characterized in that a chute is provided on the surface of the scraper to slide the dust scraped by each scraping claw toward the base end of the scraper, and an inclined dust discharge path is provided immediately below the base end of the chute to discharge the dust dropped from the chute to the outside. Claim 1 or 2 2. The dust removal device according to claim 1. The shape of the dust discharge path is arbitrary, and the routing of the dust discharge path is also arbitrary. [Effects of the Invention]

[0016] According to the invention described in claim 1, when removing dust from the screen, first, the screen on which the dust has been captured is raised from the water surface of the waterway along a pair of left and right guide rails using the screen lifting means, and then the scraper is moved using the scraper moving means to position each scraping claw at the dust scraping position on the screen.

[0017] Next, in this state, the screen is returned to below the water surface by the screen lifting means using its own weight, and during the descent, the dust trapped on the screen is scraped off by the scraping claws of the scraper. This allows the dust trapped on the screen to be removed on the ground by utilizing the screen's own weight.

[0018] As a result, it is now possible to see (check) the screen above water after dust removal, which was not possible with conventional devices that perform dust removal work below the water surface.In addition, the scraper, which is generally weaker than the screen, is less likely to break or rust, resulting in high dust removal efficiency and easy maintenance.

[0019] especially , scraper moving means As a result of adopting a cam mechanism having a linear cam provided on the screen and a link-type follower provided on the frame that supports the guide rail, the scraper moving means and therefore the dust removal device can be simplified, the cost of the device is reduced, the number of parts is reduced and it is less likely to break down.

[0020] Also, claims 2 According to the invention described above, when removing dust from the screen, first, the screen on which the dust has been trapped is gradually raised from the water surface of the waterway along a pair of left and right guide rails by the screen lifting means. During this movement, the rectilinear cam of the screen comes into contact with the cam contact roller, causing the cam contact roller and the second link to rotate upward around the second horizontal pin.

[0021] Thereafter, the downstream part of the second link on the waterway side abuts against the second link rotation restriction stopper, restricting these rotations, but as the screen continues to rise, the straight cam continues to push up against the cam abutment roller (second link), and the first link rotates around the first horizontal pin, with the lower part of the link moving toward the upstream side of the waterway. This causes the scraper to rotate upward around the horizontal axis via the third link, causing each scraping claw on the scraper to move outward (toward the upstream side of the waterway) from its preset dust scraping position. This moving state continues only while the screen's linear cam is in contact with the cam contact roller.

[0022] Thereafter, when the linear cam passes the cam contact roller, the screen including the linear cam tilts downstream of the waterway around the horizontal axis due to its own weight. As a result, the first link rotates in the opposite direction around the first horizontal pin via the third link, and the rotation stops when the lower part of the first link abuts against the first link rotation restricting stopper. At this time, each scraping claw of the scraper returns to its dust-scraping position.

[0023] Next, using the screen's own weight, the screen lifting means gradually lowers the screen along both guide rails to below the water surface. During the descent, the lower end of the linear cam abuts against the cam abutment roller, pushing it down, causing the second link to rotate around the second horizontal pin in the opposite direction from before, away from the second link rotation restriction stopper.

[0024] This state is maintained at least until the linear cam passes the cam contact roller, so that as the screen descends, the dust trapped therein is scraped off by the scraping claws of the scraper. As a result, by using the lifting and lowering of the screen to operate the cam mechanism, dust trapped on the screen can be reliably and automatically removed.

[0025] Furthermore, claims 3 According to the invention described in the above, the dust scraped off the screen by each scraping claw of the scraper slides down the surface of the chute and falls into an inclined dust discharge path located directly below the base end of the chute. The fallen dust then slides down the dust discharge path and is discharged outside the dust removal device. This allows the dust scraped off by the scraper to be discharged outside the device without any power. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a side view of a dust remover according to a first embodiment of the present invention in use. [Figure 2] FIG. 2 is a front view of the dust removal device shown in FIG. [Figure 3] FIG. 2 is an enlarged front view of a screen used in the dust removal device of FIG. [Figure 4] FIG. 4 is an enlarged side view of the screen shown in FIG. 3. [Figure 5] 2 is an enlarged front view of a scraper used in the dust remover of FIG. 1. FIG. [Figure 6] FIG. 6 is an enlarged side view of the screen shown in FIG. 5. [Figure 7] 2 is an enlarged side view of a main part of the dust remover shown in FIG. 1, showing the operation of a cam mechanism accompanying the elevation and lowering of a screen. [Figure 8] 2 is a side view showing a state in which the screen has reached the middle portion of the guide rail in the dust remover shown in FIG. 1. FIG. [Figure 9] FIG. 9 is a front view of the dust removal device shown in FIG. 8. [Figure 10] 2 is a side view showing a state in which the screen has reached the top of the guide rail in the dust remover shown in FIG. 1. FIG. [Figure 11] FIG. 11 is a front view of the dust removal device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Here, the dust removal device will be described as an example of a dust removal device that removes dust from water flowing through a waterway as a water intake facility for small-scale hydroelectric power generation. [Example]

[0028] 1 and 2, reference numeral 10 denotes a dust remover according to a first embodiment of the present invention. This dust remover 10 comprises a frame 12 erected across a waterway 11 as a water intake facility for small-scale hydroelectric power generation, a lattice-frame screen 14 arranged in the waterway 11 and having a plurality of dust removal grates 13 arranged in a spaced relationship parallel to the left and right, a pair of left and right guide rails 15 whose lower part is arranged within the waterway 11 and guides the screen 14 to move up and down between a lowered position where the screen 14 captures dust from the water flowing through the waterway 11 and an upper position above the water surface of the waterway 11, and an electric winch (slat) for raising and lowering the screen 14 along both guide rails 15. The screen 14 is provided with a dust removal grating 13 (clean lifting means) 16, a scraper 18 having a plurality of scraping claws 17 inserted between adjacent dust removal grates 13 and spaced apart in parallel on the left and right to scrape off the dust captured on the screen 14, and a cam mechanism (scraper moving means) 19 which moves each scraping claw 17 away from the screen 14 when the screen 14 is raised, and moves each scraping claw 17 close to the screen 14 to a dust scraping position P where the dust captured on the screen 14 can be scraped off when the screen 14 is lowered.

[0029] These components will be specifically described below with reference to FIGS. As shown in FIGS. 1 and 2, the mount 12 is a metal frame having a vertically long, approximately right-angled trapezoidal shape when viewed from the side. This stand 12 has long left and right lower frames 20 extending in the front-to-rear direction, left and right rear frames 21 extending in the up-down direction, short left and right upper frames 23 extending in the front-to-rear direction, left and right intermediate frames 22 extending in the front-to-rear direction connecting the left and right rear frames 21 to the longitudinal middle portions of the corresponding guide rails 15, an upper rear frame 24 extending in the left-to-right direction connecting the upper ends of the left and right upper frames 23, and a lower rear frame 25 extending in the left-to-right direction connecting the lower ends of the left and right upper frames 23.

[0030] Of these, the left and right lower frames 20 extend toward the upstream direction of the waterway, passing through the corresponding guide rails 15. Between the base of these extensions and a portion slightly below the midpoint in the length direction of the corresponding guide rails 15, a pair of left and right bearing support frames 26 having a roughly inverted L shape, which constitute the portion of the frame 12 upstream of the guide rails 15 in the waterway, are connected (see also Figure 7).

[0031] 3 and 4, the screen 14 has a plurality of dust removal grates 13 arranged in parallel at a predetermined pitch between two linear cams 27 (described below) that serve as left and right plates, and these plates are connected in a fine grid pattern by a pair of elongated upper and lower connecting rods 28 extending in the left-right direction and four horizontal frame rods 29 also extending in the left-right direction. A chain 30 of the electric winch 16 is hooked to the longitudinal midpoint of the upper connecting rod 28 via a hook (not shown).

[0032] A plurality of hooks 31 for catching underwater dust are provided at a predetermined pitch along the length of the front edge of each dust grate 13. A plurality of guide rollers 32 arranged in pairs on the left and right sides and running on each guide rail 15 are journaled on the ends of each horizontal frame rod 29 that protrude from the linear cam 27.

[0033] As shown in Figures 1 and 2, both guide rails 15 are made of a pair of channel steels that are inclined toward the downstream side of the waterway as they go upward. These guide rails 15, excluding both ends in the longitudinal direction, form the left and right frame members of the frame 12 on the upstream side of the waterway. Of these, the lower ends of both guide rails 15 are located inside the waterway 11, and the upper ends of both guide rails 15 protrude above the frame 12.

[0034] 1 and 2, the electric winch 16 is of the chain winding type and is connected via a protective cover 34 to the longitudinal midsection of a horizontally long upper frame member 33 that connects the upper ends of both guide rails 15. The power source for the electric winch 16 may be a battery or electricity obtained from a solar panel (not shown). This allows the dust removal device 10 to be used even in waterways in remote mountain areas where there are no power lines.

[0035] 5 and 6, the scraper 18 has a horizontal shaft 35 that is long in the left-right direction and is fitted into the base end of each scraping claw 17, which has an upward-facing toe 17a. Both longitudinal ends of the horizontal shaft 35 are journaled by a pair of left and right bearings 36 disposed above each bearing support frame 26. Further, a horizontally long rectangular chute 37 is provided on the surface of the scraper 18 to allow the dust scraped by each scraping claw 17 to slide down toward the base end of the scraper 18.

[0036] The chute 37 is made of a thin steel plate, and a pair of left and right side guides 38 are bent at both ends in the width direction of the chute 37. In addition, a stepped notch 37a is formed along almost the entire upper edge of the chute 37 so that dust scraped by each scraping claw 17 can easily flow into the chute 37. Furthermore, a long operating rod (fourth horizontal pin) 39 is fitted continuously in the left-right direction into the tip of each scraping claw 17. The other ends of a pair of left and right third links 40 (described later) are pivotally supported on both longitudinal ends of this operating rod 39 (see FIG. 7).

[0037] Directly below the base end of chute 37 is disposed a gutter-shaped dust discharge section (dust discharge path) 42 inclined downward to the right for discharging dust that has fallen from chute 37 to the outside via fixed chute 41. The upper end of dust discharge section 42 is supported by a small frame base 43 erected on the lower left frame 20 of stand 12.

[0038] The cam mechanism 19 shown in Figures 1, 2 and 7 constitutes the left and right side plates of the screen 14 and has a pair of left and right rectilinear cams 27 that are long in the direction in which the screen 14 is raised and lowered, and a pair of left and right followers 44 that are mounted on the frame 12 to which both guide rails 15 are fixed and that operate when the rectilinear cams 27 abut against and separate from each other.

[0039] Of these, each linear cam 27 has a width that protrudes outward (rearward) from the downstream side of the waterway of each guide rail 15 when the screen 14 moves up and down along both guide rails 15. The protruding width is constant over the entire length of the linear cam 27, and these protruding portions essentially form plate-shaped cam portions. Furthermore, these cam portions have tip portions 27a that extend upward. The tip portion of each tip portion 27a is cut at an angle so that a cam contact roller 45 (described later) can smoothly ride up on it.

[0040] On the other hand, each follower 44 has a link structure that moves each scraping claw 17 of the scraper 18 away from the screen 14 while the linear cam 27 is in contact with it when the screen 14 is raised, and moves each scraping claw 17 close to the dust scraping position P at least while the linear cam 27 is in contact with it when the screen 14 is lowered.

[0041] Now, with reference to Figures 1 and 7, each of the link-type followers 44 will be described in detail. Each follower 44 has a pair of left and right first links 47 whose upper parts are journalled via first horizontal shafts (first horizontal pins) 46 on the downstream side of the waterway from both guide rails 15 of the frame 12 (here, near the ends of the left and right intermediate frames 22 on the guide rail 15 side), a pair of left and right second links 49 whose longitudinal middle parts are journalled via second horizontal pins 48 on the upper ends of each first link 47, and a pair of left and right third links 40 whose longitudinal ends are journalled via third horizontal pins 50 on the lower ends of each first link 47 and whose other longitudinal ends are journalled to the left and right upper parts of the scraper 18 via operating rods 39.

[0042] Of these, each first link 47 has an upper end bent in a V-shape toward the upstream side of the waterway. Furthermore, a pair of left and right cam contact rollers 45 that come into contact with the linear cam 27 during its elevation are journalled at the longitudinal end of each second link 49 on the upstream side of the waterway. On the other hand, a pair of left and right weights 51 are connected to the downstream end of each second link 49 in the longitudinal direction of the waterway, which constantly rotate the end of each second link 49 on the cam contact roller 45 side upward around each second horizontal pin 48.

[0043] Furthermore, on the downstream side of the waterway above each first link 47, a pair of left and right second link rotation control stoppers 52 are protruded via connecting rods 61 to restrict the rotation of each second link 49 around each second horizontal pin 48 to an angle at which each cam abutment roller 45 moves away from each linear cam 27 being raised or lowered due to the action of the corresponding weight 51 when the screen 14 is raised or lowered.

[0044] In addition, a pair of left and right first link rotation restriction stoppers 53 are protrudingly provided on the lower part of the left and right intermediate frames 22 near the ends on the guide rail 15 side via inclined short angle steel 60 to restrict the rotation of each first link 47 so that the tip ends of each scraping claw 17 of the scraper 18, which rotates in conjunction with the rotation of each first link 47 via each third link 40 when the screen 14 is lowered, maintain the dust scraping position P.

[0045] Here, a long screw-type stopper is used as each first link rotation restricting stopper 53. This makes it possible to adjust the contact state of each cam contact roller 45 with each rectilinear cam 27 during lifting and lowering. Meanwhile, a long screw-type stopper is also used for each second link rotation restricting stopper 52. Therefore, the tip of each scraping claw 17 can be positioned accurately at the dust scraping position P.

[0046] Next, the operation of removing dust trapped on the screen 14 by the dust remover 10 according to the first embodiment of the present invention will be described with reference to Figures 1 to 11. It is assumed here that the dust removal operation on the screen 14 is performed every few hours. As shown in Figures 1, 2 and 7, during this dust removal operation, first, the screen 14 that captures the dust in the water flowing through the waterway 11 is gradually raised from the water surface in the waterway 11 along a pair of left and right guide rails 15 as indicated by arrow a by winding up the chain 30 of the electric winch 16.

[0047] During this movement, each linear cam 27 of the screen 14 abuts against and rides on the corresponding cam abutment roller 45, causing each cam abutment roller 45 and each second link 49 to rotate upward around the corresponding second horizontal pin 48 (see arrow b). At this time, the downstream side of each second link 49 in the waterway abuts against each second link rotation restricting stopper 52, thereby restricting these rotations.

[0048] As the screen 14 continues to rise, each linear cam 27 continues to push up (rotate upward) each cam contact roller 45, and each first link 47 rotates around each first horizontal axis 46 so that the lower part of each link faces upstream of the waterway. This causes the scraper 18 to rotate upward about the horizontal shaft 35 via each third link 40, and as a result, each scraping claw 17 disposed on the scraper 18 moves outward (toward the upstream side of the waterway) from the preset dust scraping position P (also see arrow b). This moving state continues only while each linear cam 27 of the screen 14 is in contact with each cam contact roller 45.

[0049] Thereafter, when each linear cam 27 passes each cam contact roller 45, each scraper 18 tilts downstream of the waterway around each horizontal shaft 35 due to its own weight, as shown by arrow c. Accordingly, each first link 47 rotates in the opposite direction around each first horizontal shaft 46 via each third link 40, and the rotation is stopped when the lower part of each first link 47 abuts against each first link rotation restricting stopper 53. At this time, the tip of each scraping claw 17 of the scraper 18 returns to the dust scraping position P.

[0050] Next, the chain 30 of the electric winch 16 is gradually unwound using the weight of the screen 14, and the screen 14 is slowly returned to below the water surface along both guide rails 15 as shown by arrow d. During the downward movement, the lower end of each linear cam 27 abuts against each cam abutment roller 45, and by further pushing these down, each second link 49 rotates around each second horizontal pin 48 in the opposite direction to before, away from each second link rotation restriction stopper 52, as shown by arrow e.

[0051] This state is maintained at least until the linear cams 27 pass the cam contact rollers 45 (in this case, until the next time (several hours later) the screen 14 rises and the tip ends of the linear cams 27 come into contact with the cam contact rollers 45). Therefore, as the screen 14 descends, the dust trapped on its surface is gradually scraped off by the scraping claws 17 of the scraper 18. The dust thus scraped off then slides down the surface of the chute 37, passes from the base end of the chute 37 through the fixed chute 41, and falls into the dust discharge section 42 located directly below it. The fallen dust slides down the dust discharge section 42, which is inclined downward to the right, and is discharged outside the dust removal device 10.

[0052] With this configuration, the dust captured on the screen 14 can be removed on land by utilizing the weight of the screen 14. As a result, it is now possible to visually check (confirm) the screen 14 above water after the dust removal work, which was not possible with conventional devices that perform dust removal work below the water surface. In addition, the scraper 18, which is generally weaker than the screen 14, is less likely to break or rust. Furthermore, high dust removal workability is achieved and maintenance is easy.

[0053] In addition, the scraper moving means employed here is a cam mechanism 19 equipped with a linear cam 27 provided on the screen 14 and a link-type follower 44 provided on the frame 12 that supports the guide rails 15. This simplifies the scraper moving means, and ultimately the dust removal device 10, resulting in lower device costs, a reduced number of parts, and less chance of breakdowns.

[0054] Furthermore, the scraper moving means employs the cam mechanism 19, which includes the link-type followers 44, each having the third link 40, cam contact roller 45, first link 47, second link 49, weight 51, second link rotation restriction stopper 52, and first link rotation restriction stopper 53, as well as the linear cams 27. This makes it possible to operate the cam mechanism 19 by utilizing the rising and falling of the screen 14, thereby ensuring automatic removal of dust trapped on the screen 14. In addition, the dust scraped off the screen 14 by each scraping claw 17 of the scraper 18 is discharged to the outside via the chute 37 and the dust discharge section 42, so that the dust scraped off the screen 14 by the scraper 18 can be discharged outside the device without any power. [Industrial Applicability]

[0055] INDUSTRIAL APPLICABILITY The present invention is useful as a dust removal device technology for removing dust mixed into flowing water in a waterway. [Explanation of symbols]

[0056] 10 Dust removal equipment 11 Waterways 12 Mounting stand 13 Dust removal grid 14 screens 15 Guide rail 16 Electric winch (screen lifting means) 17 Rake 18 Scraper 19 Cam mechanism (scraper movement means) 35 horizontal axis 37 shots 39 Operating rod (fourth horizontal pin) 40 Third Link 42 Dust discharge section (dust discharge path) 44 Dependent clause 45 Cam contact roller 46 First horizontal axis (first horizontal pin) 47 First Link 48 Second horizontal pin 49 Second Link 50 Third horizontal pin 51 weight 52 Second link rotation restriction stopper 53 First link rotation restriction stopper P Dust scraping position

Claims

1. A lattice-frame screen is arranged in the waterway and has multiple dust removal grates arranged parallel to the left and right and spaced apart from each other; a pair of left and right guide rails attached to the waterway to guide the screen as it moves up and down between a lowered position at which dust is captured from the water flowing through the waterway and an elevated position above the water surface of the waterway; a screen lifting means for lifting and lowering the screen along the guide rails; a scraper having a plurality of scraping claws spaced apart and parallel to the left and right between adjacent dust removal grates, for scraping off the dust captured by the screen; a scraper moving means for moving each of the scraping claws away from the screen when the screen is raised, and for moving each of the scraping claws close to the screen to a dust scraping position above the water surface where the dust captured on the screen can be scraped off when the screen is lowered; The scraper moving means is a cam mechanism provided on the screen and having a long linear cam extending in the lifting direction of the screen, and a follower provided on a base to which the guide rails are fixed and operated by the contact and separation of the linear cam, The dust removal device has a link structure in which the follower moves each scraping claw of the scraper away from the screen while the linear cam is in contact with the screen when the screen is raised, and moves each scraping claw of the scraper close to the dust scraping position at least while the linear cam is in contact with the screen when the screen is lowered, This dust removal device is characterized in that the screen that has captured the dust is raised above the water surface of the waterway by raising and lowering the screen, and then the scraper is moved to a dust scraping position above the water surface by the scraper moving means, and the dust is removed by utilizing the weight of the screen as it descends, and the screen is returned below the water surface.

2. The scraper has a base end pivotally supported on a portion of the frame upstream of the guide rails of the waterway via a horizontal shaft, The follower section is a first link whose upper part is pivotally supported via a first horizontal pin on a downstream side of the guide rails of the frame; a second link having an intermediate portion in a longitudinal direction pivotally supported on the upper end of the first link via a second horizontal pin; a third link having one end in a longitudinal direction pivotally supported on the lower end of the first link via a third horizontal pin and the other end in the longitudinal direction pivotally supported on the upper part of the scraper via a fourth horizontal pin; A cam contact roller that contacts the linear cam during lifting and lowering is journaled at the end of the second link on the upstream side of the waterway in the longitudinal direction, A weight is connected to the end of the second link on the downstream side of the waterway in the longitudinal direction, which weight constantly rotates the end of the second link on the cam contact roller side upward around the second horizontal pin, A second link rotation restriction stopper is protrudingly provided on an upper portion of the first link, which restricts the second link from rotating about the second horizontal pin to an angle at which the cam contact roller moves away from the linear cam during lifting and lowering due to the action of the weight when the screen is lifted and lowered, The dust removal device described in claim 1, characterized in that a first link rotation restriction stopper is protrudingly provided at the portion of the frame downstream of the two guide rails in the waterway, which restricts the rotation of the first link so that each scraping claw of the scraper, which rotates in conjunction with the rotation of the first link via the third link when the screen is lowered, maintains the dust scraping position.

3. a chute is provided on the surface of the scraper to allow the dust scraped by each scraping claw to slide down toward the base end of the scraper; 3. The dust removal device according to claim 1, wherein an inclined dust discharge passage is provided immediately below the base end of the chute for discharging the dust that has fallen from the chute to the outside.

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