JP2023177255A - Dust remover comprising pull-up type sub-screen - Google Patents

Abstract

To provide a dust remover comprising a pull-up type sub-screen which can pull up a sub-screen to a height of an upper surface of a waterway or a river so as to have an opening for natural drainage when natural drainage is required, in a dust remover installed in a waterway or a river.SOLUTION: An upper leading guide 41 and a lower leading guide 42 for guiding both sides of a pull-up type sub-screen 3 in a width direction of a waterway or a river are fixed to side surfaces 22, 22 of the waterway or river. The upper leading guide 41 and the lower leading guide 42 are formed to have a substantially arc-shaped side view and a U-shaped cross section. Pins 51, 51 are fixed to an upper part of a frame 11 of a dust remover 1 at both ends in the width direction of the waterway or river, and upper ends of elongated rod-like pulling-up beams 52, 52 are pivotally supported so as to oscillate. Lower ends of the pulling-up beams 52, 52 are pivotally supported so as to oscillate, by lower guide shafts 45, 45 via bearing metals 53, 53.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust remover equipped with a pull-up sub-screen for removing dust from waterways, rivers, etc. More specifically, the present invention relates to a dust remover equipped with a pull-up sub-screen that facilitates the removal of dust from the lower part of the main screen of the dust remover, more precisely, the sub-screen and the front of the sub-screen, and enables pump operation at low water levels.

BACKGROUND ART Dust removers installed in drainage canals, rivers, etc. to prevent dust from flowing into pumps are known to have a main screen and a sub-screen. Dust removers with a main screen on the dust remover frame have a gap between the bottom of the water channel and the bottom of the main screen to allow the rake that removes dust to pass through the bottom of the frame (lower edge of the main screen). Yes. A sub-screen is installed between the bottom of the water channel and the lower end of the main screen to prevent dust from flowing downstream through this gap. However, due to structural constraints, the rotating locus of the rake was separated from the sub-screen, making it difficult to use the rake to scrape up the dust that had accumulated on the sub-screen.

The gate pump equipment described in Patent Document 1 is such that a dust remover installed on the inland water side is raised above the water surface of the waterway using a hoisting machine wire in order to perform smooth drainage during natural drainage. In the dust remover described in Patent Document 2, the frame of the dust remover is made bendable at the middle portion, and the lower frame is lifted above the water surface of the waterway by the wire of the hoist. In the dust remover described in Patent Document 3, the dust remover main body is made detachable along a support member of a waterway, and the dust remover main body is lifted by a hanging tool and pulled out from the waterway. In the pump gate equipped with a dust remover disclosed in Patent Document 4, the dust remover is integrally attached to the door body of the pump gate, and there is no need for a special device to lift the dust remover, and the dust remover can be lifted out of the waterway by raising the door body. This is a dust remover that can be lifted up. The position conversion device for a dust remover disclosed in Patent Document 5 is a dust remover in which a dust remover body is built into a gate so as to be vertically movable, and the dust remover is vertically moved up and down by an elevating means. The pulling-up type dust remover of Patent Document 6 is a dust remover that has a frame equipped with a main screen and a sub-screen, and the dust on the bottom of the waterway is caught by a rake claw having a sharp point, and is then moved to a hoisting machine. This is a pull-up type dust remover that connects a rope and lifts the main screen above the water surface of the waterway.

Publication No. 4-28912 Special Publication No. 52-26055 Patent No. 3862368 Japanese Patent Application Publication No. 2002-275861 JP2003-206521A Utility Model Publication No. 60-11145

Pumping stations with natural drainage generally use pull-up dust removers. That is, when the pump was not operating, the entire dust remover had to be pulled up for the purpose of natural drainage (gravity flow). In addition, in the case of a dust remover equipped with a sub-screen, there is a buildup of dust in front of the sub-screen that cannot be removed by the dust remover, so it is necessary to periodically remove the dust out of the waterway or river by hand. It has become. However, in the dust removers described in Patent Documents 1 to 6, when natural drainage is required, the dust remover main body equipped with a main screen, or the dust remover main body equipped with a main screen and a sub screen, is connected to a waterway. Since the dust remover is lifted above the water surface, it is necessary to reinforce the dust remover body to prevent it from twisting. Additionally, it is necessary to reinforce the pedestal and rotation bearing that support the dust remover body. Moreover, the power of the hoist for raising the dust remover body above the water surface of the waterway increases. Furthermore, if the pump is operated with the dust remover lowered to the bottom of the waterway, dust will accumulate in front of the sub-screen, making it impossible to operate the pump at low water levels, and the accumulated water and dust will cause foul odors and deteriorate the aesthetics. It causes

The present invention achieves the following objects based on the above background.
An object of the present invention is to eliminate the need to raise the main body of the dust remover to the height of the upper surface of the waterway or river when natural drainage is required in a dust remover installed in a waterway or river, and to pull only the sub-screen. To provide a dust remover equipped with a pull-up type sub-screen, which can secure a space between the bottom of a waterway or a river and the lower part of a main screen by raising the screen to allow natural drainage.
Another object of the present invention is to provide a structure in which dust can be removed by the sub-screen, so that the dust in front of the sub-screen can be removed by pulling up the sub-screen, and the pulling-up method can prevent accumulated water or dust from accumulating. The purpose of the present invention is to provide a dust remover equipped with a sub-screen.

Still another object of the present invention is to provide a dust remover equipped with a pull-up sub-screen that enables pump operation at low water levels by removing dust in front of the sub-screen.
A further object of the present invention is that, compared to a method in which the dust remover body is pulled up, reinforcement of the dust remover body to prevent the dust remover body from twisting and reinforcement of the mount and rotation bearing that support the dust remover body are unnecessary. An object of the present invention is to provide a dust remover equipped with a pull-up sub-screen.
Still another object of the present invention is that, compared to a method of pulling up the dust remover body, there is no need for the hoist to have a strong structure necessary to pull up the dust remover body, and the power of the hoist is small. An object of the present invention is to provide a dust remover equipped with a pull-up sub-screen that can be used easily.

The present invention takes the following measures in order to solve the above problems.
That is, the dust remover equipped with a pull-up sub-screen according to the first aspect of the present invention is a dust remover having a frame equipped with a main screen for removing dust flowing into a waterway or river, the lower part of which is in contact with the bottom surface of the waterway or river, A sub-screen whose upper part extends to near the bottom of the main screen of the dust remover, and when natural drainage is required, the sub-screen is connected to the upper surface of the waterway or river so as to have openings for natural drainage. It is characterized by being equipped with a pull-up sub-screen that can be pulled up to a height of .

The dust remover equipped with a pull-up sub-screen according to the second aspect of the present invention is the pull-up sub-screen according to the first aspect of the present invention, wherein the pull-up sub-screen removes dust near the bottom of the waterway or river, It is characterized in that it can be pulled up together with the garbage to the height of the upper surface of the waterway or river.

The dust remover equipped with a pull-up type sub-screen according to the third aspect of the present invention is the dust remover according to the present invention 1 or 2, wherein the pull-up type sub-screen is fixed to the side of the waterway or river, and the pull-up type sub-screen is fixed to the side of the waterway or river. Alternatively, the river is characterized by having guides for guiding both sides in the width direction of the river.
The dust remover equipped with a pull-up type sub-screen according to the fourth aspect of the present invention is that in the first or second aspect of the present invention, the pull-up type sub-screen has a bottom side substantially parallel to the bottom surface of the waterway or river, and a downstream end of the bottom side. It is characterized by having side edges extending upward in a substantially vertical direction from the top.

In the dust remover equipped with a pull-up type sub-screen according to the present invention 5, in the present invention 3, the guide guide moves from the bottom of the waterway or river to the waterway or river while maintaining the attitude of the pull-up type sub-screen. It is characterized in that it is guided to be pulled up to the height of the upper surface of.
The dust remover equipped with a pull-up sub-screen according to the sixth aspect of the present invention is characterized in that, in the third aspect of the present invention, the guide has two substantially arcuate shapes, upper and lower.
The dust remover equipped with a pull-up type sub-screen according to the seventh aspect of the present invention is the dust remover according to the present invention 1 or 2, wherein the pull-up type sub-screen protrudes upward at an upstream end of the bottom side of the pull-up type sub-screen. A feature is that a protrusion is formed.
The dust remover equipped with a pull-up sub-screen according to the present invention 8 is the dust remover according to the present invention 1 or 2, wherein the pull-up sub-screen is located at the bottom of the waterway or river. The present invention is characterized in that a locking member for locking the pull-up sub-screen to the frame of the dust remover is attached to the frame of the dust remover.

The dust remover equipped with a pull-up sub-screen according to the present invention 9 is the dust remover according to the present invention 1 or 2, wherein the pull-up sub-screen is located at the bottom of the waterway or river. A locking member for locking the pull-up sub-screen to the bottom surface of the waterway or river is attached to the bottom surface of the waterway or river.
A dust remover equipped with a pull-up type sub-screen according to the present invention 10 is the dust remover according to the present invention 1 or 2, wherein the pull-up type sub-screen is located at the bottom of the waterway or river. A locking member for locking the pull-up sub-screen to the upper surface of the waterway or river is attached to the upper surface of the waterway or river.
The dust remover equipped with a pull-up type sub-screen according to the present invention 11 is the dust remover according to the present invention 1 or 2, wherein the pull-up type sub-screen is a plurality of bar screens arranged at predetermined intervals in the width direction of the waterway or river. A bottom plate substantially parallel to the bottom surface of the waterway or river is fixed to the lower part of the bottom of the pull-up sub-screen.
The dust remover equipped with a pull-up type sub-screen according to the present invention 12 is the dust remover according to the present invention 1 or 2, wherein the pull-up type sub-screen is provided on a bottom plate of the pull-up type sub-screen and protrudes toward the bottom side of the waterway or river. It is characterized by having a plurality of sludge removal protrusions.

The dust remover equipped with a pull-up sub-screen of the present invention allows the space between the bottom of a waterway or river and the lower part of the main screen to be removed when natural drainage is required by pulling up only the sub-screen. Water and dust will not accumulate due to natural drainage from the natural drainage openings.
Furthermore, by making the sub-screen so constructed that dust can be removed, the dust above and in front of the sub-screen can be removed by pulling up the sub-screen.
Additionally, by removing dust in front of the sub-screen, pump operation at low water levels becomes possible.
Furthermore, compared to the method of lifting the dust remover body, there is no need to reinforce the dust remover body, the pedestal or rotation bearing that supports the dust remover body, and there is no need to make the hoist a strong structure. The machine requires less power.

FIG. 1 is an overall side view showing a dust remover equipped with a pull-up sub-screen according to Embodiment 1 of the present invention. FIG. 2 is a view taken along arrow P in FIG. FIG. 3 is an enlarged side view of the lower part of the dust remover equipped with the pull-up sub-screen according to Embodiment 1 of the present invention. FIG. 4 is a sectional view taken along line AA in FIG. FIG. 5 is an enlarged side view showing a locking member that locks the pull-up type sub-screen to the frame of the dust remover in a state where the pull-up type sub-screen of Embodiment 1 is located at the bottom of a waterway or river. . FIG. 6 shows a locking member on the upper surface of a waterway or river that locks the pull-up sub-screen of Embodiment 2, and FIG. 6(a) shows a pin that swingably supports the upper end of the pull-up beam. FIG. 6(b) is an enlarged side view showing the vicinity, showing a state where the pull-up sub-screen is located at the bottom of a waterway or river; FIG. 6(b) is a longitudinal cross-sectional view of FIG. 6(a). FIG. 7 shows a state in which the pull-up sub-screen is raised to the height of the upper surface of a waterway or river, and is a view corresponding to FIG. 6(a).

[Dust remover equipped with pull-up sub-screen of Embodiment 1]
FIG. 1 is an overall side view showing a dust remover equipped with a pull-up sub-screen according to Embodiment 1 of the present invention, FIG. 2 is a view taken along arrow P in FIG. 1, and FIG. An enlarged side view of the lower part of a dust remover equipped with an upper type sub-screen, FIG. 4 is a sectional view taken along line AA in FIG. FIG. 3 is an enlarged side view showing a locking member that locks the pull-up sub-screen to the frame of the dust remover in this state. As shown in FIG. 1, the dust remover 1 is installed so that the lower end of its frame 11 is in contact with the bottom surface 21 of a waterway or river, which is the bottom of the waterway or river. A plurality of plate-shaped main screens (bar screens) 12 for removing dust are attached to a frame 11 of the dust remover 1 and arranged at equal intervals in the width direction of a waterway or river.

The rake 13 shown in FIG. 2 descends on the downstream side of the main screen 12 (backward descent), turns over at the bottom of the frame 11, passes through the opening at the lower end of the main screen 12, and rises to the upper side of the main screen 12. , is configured to scrape up dust accumulated on the main screen 12. The details of the drive mechanism of the rake 13 and the like are not the gist of the present invention and are well-known techniques, so they will not be described in detail. The lower end of the main screen 12 is cut away to allow the rake 13 to pass through the lower end of the frame 11. Therefore, in order to prevent dust from flowing downstream from the opening between the bottom surface 21 of the waterway or river and the lower end of the main screen 12, the gap between the bottom surface 21 of the waterway or river and the vicinity of the lower part of the main screen 12 is A pull-up sub-screen 3 is disposed at.

As shown in FIG. 3, the pull-up sub-screen 3 is composed of a base 31 that is approximately parallel to the bottom 21 of the waterway or river, and a side 32 that extends upward in a substantially vertical direction from the downstream end of the base 31. It is an L-shaped, plate-shaped bar screen. The pull-up sub-screens 3 have the same size in the width direction of the waterway or river as the main screen 12, and are formed in plural at equal intervals (same spacing as the main screen 12) in the width direction of the waterway or river. The pull-up sub-screen 3 is integrally fixed at the downstream end of the bottom 31 with a cylindrical connecting pipe 33 that is substantially parallel to the bottom surface 21 of the waterway or river (FIG. 2). A protrusion 34 that protrudes upward is formed at the upstream end of the bottom side 31 . Further, as shown in FIG. 4, a bottom plate 35 that is substantially parallel to the bottom surface 21 of the waterway or river is fixed to the lower part of the bottom side 31. A plurality of sludge removal protrusions 36 protruding toward the bottom surface 21 of the waterway or river are formed on the bottom plate 35 (FIG. 5(a)).

As shown in FIG. 2, on the side surfaces 22, 22 of the waterway or river that become the waterway wall or river wall, there are an upper guide guide 41 and a lower guide guide that guide both sides of the pull-up sub-screen 3 in the width direction of the waterway or river. 42 is fixed. The upper guide 41 and the lower guide 42 have a substantially arc-shaped side view and a U-shaped cross section. The upper guide 41 and the lower guide 42 are fixed to multiple locations on the side surfaces 22, 22 of the waterway or river via mounting flanges 43 with bolts 44, as shown in FIG. As shown in FIGS. 2 and 4, lower guide shafts 45, 45 are integrally formed at both ends of the connecting pipe 33 in the waterway or river width direction. Further, upper guide shafts 46, 46 are integrally formed on the side edges 32 of the pull-up type sub-screen 3 at both ends in the waterway or river width direction. Guide rollers 48, 48 are rotatably supported on the lower guide shafts 45, 45 and the upper guide shafts 46, 46 via bearing metals 47, 47.

The guide roller 48 on the side of the upper guide shaft 46 is slidably fitted into the upper guide 41, and the guide roller 48 on the side of the lower guide shaft 45 is slidably fitted on the lower guide 42. Pins 51, 51 are fixed to the upper part of the frame 11 of the dust remover 1 at both ends in the waterway or river width direction, and the upper ends of elongated rod-shaped lifting beams 52, 52 are swingably supported. The lower ends of the lifting beams 52, 52 are swingably supported by lower guide shafts 45, 45 via bearing metals 53, 53. An electric (or manual) hoist 24 is attached to the upper surface 23 of the waterway or river, which is the top of the waterway or river, and a wire rope (or chain) 25 is wound by the hoist 24. The lower ends are fixed near the lower ends of the lifting beams 52, 52. When the hoisting machine 24 is operated to wind up the wire rope (or chain) 25 and the pulling beams 52, 52 are swung clockwise around the pins 51, 51 by a swinging angle θ (FIG. 1), the pulling The upper type sub-screen 3 is guided by an upper guide 41 and a lower guide 42 and is lifted up to near the height of the upper surface 23 of the waterway or river.

As shown in FIG. 3, the vertical distance L1 between the center of the upper guide shaft 46 and the center of the lower guide shaft 45 is the distance between the center of the groove of the upper guide 41, which has a U-shaped cross section, and the center of the lower guide shaft 42. The cross section of the groove is formed to be the same as the distance L2 in the vertical direction from the center of the U-shape. Therefore, the pull-up sub-screen 3 is pulled up from the bottom surface 21 of the waterway or river to near the height of the upper surface 23 of the waterway or river, with the bottom side 31 maintained substantially parallel to the bottom surface 21 of the waterway or river. A bottom plate 35 is fixed to the bottom side 31 of the pull-up type sub-screen 3 (FIG. 4), and a protrusion 34 that projects upward is formed at the upstream end of the bottom side 31, so that the pull-up type sub-screen 3 The dust 6 accumulated in the waterway or river is reliably pulled up to the upper surface 23 of the waterway or river. A plurality of sludge removal protrusions 36 are formed on the bottom plate 35 of the pull-up sub-screen 3 so as to protrude toward the bottom surface 21 of the waterway or river (FIG. 5). Therefore, when pulling up and lowering the pulling-up type sub-screen 3, the sludge removal protrusions 36 cut and remove sludge from the bottom surface 21 of the waterway or river, so that the pulling-up and lowering operations of the pulling-up type sub-screen 3 are smoothly carried out. do.

As shown in FIG. 5, a pull-up sub-screen 3 is attached to the frame 11 of the dust remover 1, with the pull-up sub-screen 3 positioned on the bottom surface 21 of a waterway or river. A locking member 7 for locking is attached. The locking members 7 are installed at two locations on both sides of the waterway or river in the width direction. The locking member 7 includes a mounting flange 71 fixed to the frame 11 with bolts 711, 711, opening/closing claws 72, 72, compression springs 73, 73, and pins 74, 74. Two spherical locking protrusions 75 are fixed on both sides of the connecting pipe 33 of the pull-up type sub-screen 3 in the width direction of the waterway or river so as to correspond to the installation position of the locking member 7. Therefore, when the pull-up sub-screen 3 is pulled down to the bottom surface 21 of a waterway or river, the spherical locking projections 75 are pushed into the opening/closing claws 72, 72, and the compression springs 73 , 73 to open the opening/closing claws 72, 72, and the spherical locking protrusion 75 is held between the opening/closing claws 72, 72. As a result, when the pull-up sub-screen 3 is located on the bottom surface 21 of the waterway or river, the pull-up sub-screen 3 is locked to the lower end of the frame 11 of the dust remover 1 and held in place. Although not shown in the drawings, the locking member 7 may be fixed (installed) on the bottom surface 21 of a waterway or river. The locking between the locking member 7 and the spherical locking projection 75 is adjusted by threading the base of the spherical locking projection 75 and rotating the spherical locking projection 75.

[Dust remover equipped with a pull-up sub-screen according to Embodiment 2]
FIG. 6 shows a locking member 8 on the upper surface 23 of a waterway or river that locks the pull-up sub-screen 3 of the second embodiment, and FIG. 6(a) shows the upper end of the pull-up beam 52 pivotably supported 6(b) is an enlarged side view showing the vicinity of a pin 51, in which the pull-up sub-screen 3 is located on the bottom surface 21 of a waterway or river, and FIG. 6(b) is a longitudinal cross-sectional view of FIG. 6(a). . FIG. 7 shows a state in which the pull-up sub-screen 3 is raised to the height of the upper surface 23 of a waterway or river, and is a view corresponding to FIG. 6(a).

As shown in FIG. 6, the pull-up sub-screen 3 is placed on the top surface 23 of the waterway or river while the pull-up sub-screen 3 is positioned on the bottom surface 21 of the waterway or river. 1 to 5) is attached. The locking members 8 are installed at two locations on the upper surface 23 of the waterway or river on both sides in the width direction of the waterway or river. FIG. 6 shows only one locking member 8 on one side. The locking member 8 includes a locking frame 81 whose bottom plate is fixed to the upper surface 23 of the waterway or river with four anchor bolts 811, a fastening bolt 83, a double nut 831, and the like. A locking arm 52 having a U-shaped cross section is fixed near the upper end of the swinging lifting beam 52, and the locking arm 82 is attached to a pin that is the center of swing of the lifting beam 52. It is formed in an arc shape centered at 51. The locking arm 82 has a long arcuate groove 821 centered around the pin 51 . The arcuate long groove 821 is formed in the same angular range θ as the swing angle θ of the lifting beam 52 (FIG. 1). The fastening bolt 83 is screwed into the locking frame 81 and protrudes through the arcuate long groove 821, and is movable along the arcuate long groove 821 as the lifting beam 52 swings. By tightening the double nut 831, the locking arm 82 can be fixed to the locking frame 81.

Therefore, with the pull-up type sub-screen 3 shown in FIG. After being lowered to the bottom surface 21 of the river, the locking arm 82 can be fixed to the locking frame 81 by tightening the double nut 831. As a result, when the pull-up sub-screen 3 is located on the bottom surface 21 of the waterway or river, the pull-up sub-screen 3 is locked to the locking member 8 on the top surface 23 of the waterway or river, and is held in place. Ru. If the pull-up type sub-screen 3 is locked with the locking member 8 on the top surface 23 of the waterway or river, the pull-up type sub-screen 3 will be prevented from locking due to dust accumulated or flowing on the bottom surface 21 of the waterway or river. This is preferable because the inhibitory effect is not inhibited.

The dust remover equipped with a pull-up sub-screen of the present invention allows the space between the bottom of a waterway or river and the lower part of the main screen to be removed when natural drainage is required by pulling up only the sub-screen. Water and dust will not accumulate due to natural drainage from the natural drainage openings. Furthermore, by making the sub-screen so constructed that dust can be removed, the dust above and in front of the sub-screen can be removed by pulling up the sub-screen. Additionally, by removing dust in front of the sub-screen, pump operation at low water levels becomes possible. Furthermore, compared to the method of lifting the dust remover body, there is no need to reinforce the dust remover body, the pedestal or rotation bearing that supports the dust remover body, and there is no need to make the hoist a strong structure. The machine requires less power.

1...Dust remover 11...Frame 12...Main screen 13...Rake 21...Bottom surface of waterway or river 22...Side surface of waterway or river 23...Top surface of waterway or river 24...Hoisting machine 25...Wire rope (or chain)
3... Pull-up sub-screen 31... Bottom side 32... Side side 33... Connecting pipe 34... Protrusion 35... Bottom plate 36... Sludge removal protrusion 41... Upper guide guide 42... Lower guide guide 43... Mounting flange 44... Bolt 45... Lower Guide shaft 46...upper guide shaft 47...bearing metal 48...guide roller 51...pin 52...lifting beam 53...bearing metal 6...dust 7...locking member 71...mounting flange 711...bolt 72...opening/closing claw 73...compression spring 74 ... Pin 75 ... Locking projection 8 ... Locking member 81 ... Locking frame 811 ... Anchor bolt 82 ... Locking arm 821 ... Arc-shaped long groove 83 ... Fastening bolt 831 ... Double nut

Claims (12)

In a dust remover having a frame with a main screen for removing dust flowing into a waterway or river,
A sub-screen whose lower part is in contact with the bottom of the waterway or river and whose upper part extends near the lower part of the main screen of the dust remover, and has an opening for natural drainage when natural drainage is required. A dust remover equipped with a pulling-up type sub-screen, characterized in that the dust remover is equipped with a pulling-up type sub-screen that allows the sub-screen to be pulled up to the height of the upper surface of the waterway or river. A dust remover equipped with a pull-up sub-screen according to claim 1,
The pull-up type sub-screen is a pull-up type sub-screen that removes garbage near the bottom of the waterway or river, and is capable of being pulled up together with the garbage to the height of the upper surface of the waterway or river. A dust remover equipped with a pull-up sub-screen. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
The pull-up sub-screen is fixed to a side surface of the waterway or river, and includes guides that guide both sides of the pull-up sub-screen in the width direction of the waterway or river. Dust remover with. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
The pull-up type sub-screen is characterized in that the pull-up type sub-screen is composed of a bottom side that is substantially parallel to the bottom surface of the waterway or river, and side sides that extend upward in a substantially vertical direction from the downstream end of the bottom side. Dust remover with screen. In the dust remover equipped with a pull-up sub-screen according to claim 3,
The pulling-up method is characterized in that the guide guide guides the pulling-up type sub-screen to be lifted from the bottom of the waterway or river to the height of the upper surface of the waterway or river while maintaining its posture. Dust remover equipped with a sub-screen. In the dust remover equipped with a pull-up sub-screen according to claim 3,
A dust remover equipped with a pull-up sub-screen, wherein the guide has two substantially arc-shaped sections, upper and lower. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
A dust remover equipped with a pull-up type sub-screen, wherein the pull-up type sub-screen has a protrusion projecting upwardly formed at an upstream end of a bottom side of the pull-up type sub-screen. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
In the pull-up type sub-screen, a locking member that locks the pull-up type sub-screen to the frame of the dust remover is attached to the dust remover when the pull-up type sub-screen is located at the bottom of the waterway or river. A dust remover equipped with a pull-up sub-screen, which is attached to a frame. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
In the pull-up type sub-screen, the locking member for locking the pull-up type sub-screen to the bottom surface of the waterway or river is located at the bottom of the waterway or river with the pull-up type sub-screen located at the bottom of the waterway or river. Or a dust remover equipped with a pull-up sub-screen, which is characterized by being attached to the bottom of the river. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
In the pull-up type sub-screen, the locking member that locks the pull-up type sub-screen to the upper surface of the waterway or river is located at the bottom of the waterway or river. Or a dust remover equipped with a pull-up sub-screen, which is characterized by being attached to the top of the river. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
The pull-up sub-screen is a plurality of bar screens arranged at predetermined intervals in the width direction of the waterway or river,
A dust remover equipped with a pull-up type sub-screen, characterized in that a bottom plate substantially parallel to the bottom of the waterway or river is fixed to a lower part of the bottom of the pull-up type sub-screen. A dust remover equipped with a pull-up sub-screen according to claim 1 or 2,
The pull-up type sub-screen is characterized in that a plurality of sludge removal projections protruding toward the bottom side of the waterway or river are formed on the bottom plate of the pull-up type sub-screen. Dust remover.

Images