JP2005139631A - Rake circulating type dust collector with auxiliary screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively rake up garbage deposited on a waterway bottom surface on the auxiliary screen front side, by further enhancing raking-up treating capacity by a rake of the garbage flowed to an auxiliary screen front face. <P>SOLUTION: This rake circulating type dust collector 1 is provided with an auxiliary screen 4 on the outside of a lower reversing part 6 of the rake 5 and the downstream side of the lower end side 3a of a main screen 3. The front face 4a of the auxiliary screen 4 is substantially vertically faced to the lowest position vicinity of the lower reversing part 6 of the rake 5. The tip of the rake 5 is formed in a comb-teeth shape of an L shape in a side view. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rake circulation type dust remover that scrapes dust collected on the front surface of a main screen of a vertical grid installed in a water channel with a rake that circulates upward along the front surface of the main screen and discharges it to the upper side of the water channel. In particular, it further enhances the scraping capacity of the dust collected on the front of the auxiliary screen installed at the lower end of the rake circulation dust remover by rake and effectively scrapes the dust accumulated on the bottom of the water channel on the front of the auxiliary screen. The present invention relates to a rake circulation dust remover with an auxiliary screen that is raised.

Conventionally, as a device that removes dust that settles in water facilities such as drainage stations, the dust that flows down is deposited on the front of the main screen in the form of a vertical grid installed in the water facility of the waterway. There is known a rake circulation type dust remover that mechanically lifts up by a rake that circulates upward along the front surface of the main screen and discharges it to a predetermined position above a water channel.
In a rake circulation type dust remover, the circulating rake moves upward along the front of the main screen, reverses upward from the upper side of the main screen and moves downward on the rear side of the main screen, and moves to the lower end of the main screen. It is structured such that it is reversed from the downward side to the upward side and circulates upward again along the front surface of the main screen.
In the rake circulation type dust remover, the circulating rake is reversed on the lower end side of the main screen, so there is a gap where the rake can be reversed between the lower end of the main screen and the bottom of the water channel. There is a disadvantage that the dust settles through the water facility downstream of the main screen.
For this reason, in order to prevent this, an auxiliary screen in the form of a vertical grid is separately installed on the upstream side of the lower end side of the main screen. The dust collected on the front surface of the auxiliary screen installed close to the lower end side of the main screen is scraped up and discharged by a rake that moves up and reverses the lower end side of the main screen. Yes.
However, as shown in FIG. 5, the rake 102 that circulates up and down along the main screen 101 has a thickness of the auxiliary screen 103, so that the protruding length B ₂ from the front surface of the auxiliary screen 103 is, for example, that of the rake 102. When only about 1/4 of the total length in the protruding direction can be projected, and when the rake 102 scrapes up dust collected on the front surface of the auxiliary screen 103, it is about 4 minutes of the total length of the rake 102 in the protruding direction. However, there is a problem that processing ability is inferior.
Further, the movement trajectory A of the tip of the rake 102 passes through a slightly higher H ₂ height from the bottom of the water channel on the front side of the auxiliary screen 103 and does not pass near the bottom of the water channel. There was also a problem that it was not possible to effectively scrape the dust deposited on the surface.
Therefore, the patent applicant of the present application, as a solution to the above-mentioned problem, provided the lower end side of the main screen inside the lower inversion portion of the rake and formed an arc shape toward the downstream side, An auxiliary screen is provided outside the reversing portion and downstream of the lower end side of the main screen so that the front surface of the auxiliary screen vertically faces the lowest position of the lower reversing portion of the rake, The upper end extends to a high position inside the trajectory of the front comb teeth tip of the rake, and the protrusion length of the front comb teeth tip of the rake from the upper front end of the auxiliary screen when passing through the vertical front surface of the auxiliary screen A rake circulation dust remover with an auxiliary screen with a large screen was created. A patent application was filed in 1996 (Japanese Patent Laid-Open No. 9-268540), and a patent (Patent No. 3002) was issued in November 1999. Have acquired the No. 73).
JP-A-9-268540

However, in the above-mentioned patent (Japanese Patent No. 3002773), since the comb-shaped rake that scrapes up the dust is formed flat toward the tip, the dust stored in the front of the auxiliary screen is reversed. However, there is a problem that a part of the dust falls more easily than the rake in the process of pushing up and scraping.
In addition, there is a problem that the dust is likely to be in the form of a baby boom because it is scraped up while being pushed out.
Furthermore, PET bottles floating on the surface of the water may be difficult to scoop up due to fluctuations in the surface of the water caused by the movement of the rake.

The present invention was devised in order to further improve the above-mentioned patent (Japanese Patent No. 3002773). The object of the present invention is to improve the scraping capacity by the rake of dust deposited on the front of the auxiliary screen. It is another object of the present invention to provide a rake circulation type dust remover with an auxiliary screen which is further enhanced and can effectively scrape dust accumulated on the bottom of a water channel on the front side of the auxiliary screen.

  In order to achieve the above object, the present invention moves up the front of a vertical grid-shaped main screen installed in a water channel, moves down the back of the main screen, circulates up and down, and moves under the main screen. A rake circulation system that has a rake that reverses from bottom to top in the lower reversing part, and scrapes dust that has flowed up to the front of the main screen with a rake that moves up along the front of the main screen and then discharges it above the water channel In the dust remover, the lower end side of the main screen is provided inside the lower reversing portion of the rake and is formed in an arc shape toward the downstream side, and outside the lower reversing portion of the rake and downstream of the lower end side of the main screen An auxiliary screen is provided, the front surface of the auxiliary screen faces substantially vertically near the lowermost position of the lower inverting portion of the rake, and the upper end of the substantially vertical front surface of the auxiliary screen is the tip of the front comb teeth of the rake. Extending to a high position inside the movement trajectory, increasing the protrusion length of the front comb teeth tip from the front upper end of the auxiliary screen when passing through the substantially vertical front surface of the auxiliary screen, and the front of the rake The tip of the comb teeth is formed in an L-shaped comb shape when viewed from the side, and the rake flat portion that becomes the proximal end side of the front comb teeth at the lower inversion portion becomes the tip of the front comb teeth before it comes out on the front surface of the auxiliary screen. The rake tip L-shaped bent portion is composed of a means that comes out in a substantially horizontal direction.

  Here, as a preferred embodiment, the front surface of the auxiliary screen should be perpendicular to the lowest position of the lower inverting portion of the rake, and the upper side of the auxiliary screen is shaped to the shape of the rake movement locus at the lower inverting portion. It is good to form in a corresponding shape.

Further, the arc shape on the lower end side of the main screen may be formed of a lower half semicircular plate, and the plate piece obtained by bending the lower end side of the main screen downwardly into a convex shape It may be formed from the board piece which bent the lower end side of the main screen to the downward semicircular arc shape. It may be formed from the lower half side of the circular plate, or may be formed from a lower half semi-regular polygon plate piece.

As is clear from the above description, according to the rake circulation dust remover with an auxiliary screen according to the present invention, the tip of the rake is formed in an L-shaped comb tooth shape, and the rake flat portion is the front surface of the auxiliary screen at the lower inversion portion. By making the rake tip L-shaped bent part come out in a substantially horizontal direction before it comes out, the dust can be easily captured. Moreover, since the tip of the rake is L-shaped, it is possible to prevent the dust from falling from the rake even when the rake tip moves halfway at the bottom and moves upward. Furthermore, by making the L-shaped tip into a comb-like shape, it becomes easy to stab into nodular grass, fallen leaves, etc., and then it can be lifted after being stabbed into the stored dust. It prevents dust from falling from the vicinity, and even entangled dust can be easily scraped and removed. In this way, it is extremely new and useful, such as further improving the scraping processing capacity by rake of dust deposited on the front of the auxiliary screen and effectively scraping the dust accumulated on the bottom of the water channel on the front side of the auxiliary screen. The effect which becomes.

Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.
Here, FIG. 1A is a side view of the main part, FIG. 1B is a partial plan view of the rake, FIG. 1C is a side view of the rake, and FIGS. It is.

  In the figure, a rake circulation type dust remover 1 rakes up dust collected on the front surface of a main screen 3 installed in a water channel 2 with a rake 5 that circulates and moves upward along the front surface of the main screen 3. It is a device that discharges upward.

  The rake circulation dust remover 1 is composed of a pair of frames 1a on both left and right sides, and the left and right frames 1a are installed inside the left and right side walls of the water channel 2 with the upper side slightly inclined toward the downstream side. ing. The lower ends of the left and right frames 1a are fixed to the water channel bottom surface 2a, and the upper side (not shown) of the frame 1a protrudes above the water channel 2 and is curved downstream.

  An endless main chain 1b is attached to each of the left and right frames 1a so as to be freely circulated. The main chain 1b circulates and moves the rake 5, and the rake 5 is horizontally mounted between the left and right main chains 1b and both ends thereof are connected. The main chain 1b is constituted by a roller with a flange, for example.

  The main chain 1b circulates in the guide grooves 1c formed in the left and right frames 1a and the main chain lower portion 1d. The main chain 1b meshes with a drive sprocket (not shown) attached to the upper side of the frame 1a, and circulates and moves in the vertical direction by driving of the drive sprocket (not shown).

  On the lower end side of each of the left and right frames 1a, a semi-circular main chain lower reversing portion 1d for reversing the endless main chain 1b is provided. The main chain lower part inverting part 1 d is a part that becomes the lower inverting part 6 of the rake 5. The main chain 1b is reversed from a downward movement to an upward movement by the main chain lower portion 1d. The main chain lower part inverting portion 1d is formed in a downward semicircular shape slightly inclined.

  Between the pair of left and right frames 1a, 1a of the rake circulation type dust remover 1, a vertical grid-shaped main screen 3 is disposed to receive the dust that is deposited. The main screen 3 is installed in the water channel 2 in order to prevent dust from flowing in and damaging the drainage station and the like, and has a shape with a small loss head.

  The main screen 3 has a rear surface fixed and held by several screen receivers 1e horizontally installed between the upper and lower frames 1a and 1a on the left and right sides of the water channel 2. Moreover, the upper end of the main screen 3 (not shown) extends linearly to the upper part of the water channel 2 in a state of being slightly inclined toward the downstream side.

  The lower end side 3a of the main screen 3 is formed in a downward arc shape toward the downstream side, and its end is in an obliquely upward state. A downward arc shape toward the downstream side of the lower end side 3a of the main screen 3 is formed from the lower half semicircular plate 3b as shown in FIG. 1 (A). In addition to this, for example, as shown in FIG. May be formed from a plate piece that is bent in a downward convex shape on the lower end side 3a, for example, a plate piece 3c that is bent downward in a semicircular arc shape, or the lower half side of a circular plate 3d as shown in FIG. Or may be formed from a lower half semi-polygonal plate piece 3e as shown in FIG.

  The semicircular arc-like lower end side 3a of the main screen 3 is located above the main chain lower reversing part 1d which becomes the lower reversing part 6 of the rake 5, and is concentric with the semicircular main chain lower reversing part 1d. Yes. That is, the lower end side 3 a of the main screen 3 is provided inside the lower inversion portion 6 of the rake 5. The lower end side 3a of the semicircular arc shape of the main screen 3 has a predetermined distance from the water channel bottom surface 2a for passage of the rake 5 that scoops up the dust deposited on the main screen 3.

  The auxiliary screen 4 is installed close to the lower end side 3a of the main screen 3 and the main chain lower reversing part 1d which is the lower reversing part 6 of the rake 5 and on the downstream water channel bottom face 2a. Yes. That is, the auxiliary screen 4 is provided outside the lower inversion portion 6 of the rake 5. The auxiliary screen 4 is installed on the water channel bottom surface 2a in order to prevent the dust from flowing down from the gap between the lower end side 3a of the main screen 3 and the water channel bottom surface 2a, and has a small comb-shaped loss head. .

  The front surface 4a of the comb-shaped auxiliary screen 4 is formed substantially perpendicular to the water channel bottom surface 2a, including a case where the front surface 4a is perpendicular or nearly perpendicular. Further, the front surface of the vertical or substantially vertical auxiliary screen 4 is provided in the vicinity of the lowest position of the lower reversing portion 6 of the rake 5, that is, the position where the distance to the water channel bottom surface 2a is the smallest or slightly shifted. Yes. That is, the front surface 4a of the auxiliary screen 4 is the position of the lowermost end of the semicircular main chain lower reversing portion 1d where the main chain 1b that moves and reverses the rake 5 is inverted, or the vicinity thereof. At the position of the lowermost end of the semicircular arc-shaped lower end side 3a of the screen 3 or the vicinity thereof, that is, at the position where the distance between the semicircular main chain lower portion 1d and the lower end side 3a to the water channel bottom surface 2a is the smallest or its vicinity. Is provided. The front surface 4a of the auxiliary screen 4 is provided at a position slightly shifted from the lowest end position to the upstream side of the water channel 2 in the drawing.

  The upper side 4b of the comb-shaped auxiliary screen 4 is formed in a concave arc from the upper end of the vertical or substantially vertical front surface 4a toward the downstream side and extends upward, and the upper end thereof is a semicircular shape of the main screen 3 The lower end side 3a is substantially the same height as the terminal end, extends slightly toward the downstream side at that height, and is formed on the rear surface 4c perpendicular to the water channel bottom surface 2a.

  The concave arc portion on the upper side 4b of the auxiliary screen 4 is concentric with the semicircular lower end side 3a of the main screen 3 and the semicircular main chain lower reversing portion 1d. The radius of the concave arc portion on the upper side 4b is lower than the chain lower reversing portion 1d and is larger than the radius of the semicircular lower end side 3a and the main chain lower reversing portion 1d.

  A concave arc portion on the upper side 4b of the auxiliary screen 4 is formed when the rake 5 reverses from the rear side of the main screen 3 to the front side of the main screen 3 along the semicircular main chain lower inversion portion 1d. The base of 5 is provided close to the movement locus of the base 5a of the rake 5 so that it can be reversed without contacting along the concave arc portion of the upper side 4b of the auxiliary screen 4.

  The rake 5 scoops up the dust deposited on the front surface of the main screen 3, the front surface 4a of the auxiliary screen 4, and the upper side 4b of the concave arc, and the dust accumulated on the water channel bottom surface 2a on the front surface 4a side of the auxiliary screen 4. In this way, it circulates upward along the front surface of the main screen 3 and discharges it above the water channel 2. The rake 5 has a mechanism in which both ends are connected to left and right main chains 1b that are provided so as to circulate freely on the left and right frames 1a, and circulates and moves integrally by the circular movement of the left and right main chains 1b. .

  The rake 5 includes a base portion 5a extending in the left-right lateral direction of the main screen 3, and front comb teeth 5b provided so as to project greatly forward from the front portion of the base portion 5a. The front ends of the front comb teeth 5b of the rake 5 are bent in an L shape in a side view. The front comb teeth 5b of the rake 5 having an L-shaped tip include a rake flat portion 5c that is a non-bent portion that is the base end side, and a rake tip L-shaped bent portion 5d that is a bent portion that is the tip.

  The bending direction of the tip of the front comb teeth 5 b is a direction that is upward when moving upward along the front surface of the main screen 3. The L-shaped bending angle is, for example, an obtuse angle close to a substantially right angle. The tip bent into an L shape is pointed toward the tip and is formed into a shape that is easy to stab a dust. For this reason, the rake tip L-shaped bent portion which becomes the tip of the front comb tooth 5b before the rake flat portion 5c which becomes the base end side of the front comb tooth 5b comes out to the vertical or substantially vertical front surface 4a of the auxiliary screen 4 5d comes out in a substantially horizontal direction with respect to the vertical or substantially vertical front surface 4a.

  The front comb teeth 5b of the rake 5 having an L-shaped tip are formed at intervals that can pass through the gaps between the teeth of the comb-shaped auxiliary screen 4. The rear portion of the base portion 5a of the rake 5 is formed in a comb-teeth shape with a space between the vertical screens of the main screen 3 having a vertical lattice shape.

The length of the rake flat portion 5c that largely protrudes in front of the front comb teeth 5b of the rake 5 is the front comb of the rake 5 at the main chain lower part inversion portion 1d that becomes the semicircular arc-like lower end side 3a of the main screen 3. The movement trajectory A of the tip of the rake flat portion 5c of the tooth 5b is formed to a length having a slight gap with the water channel bottom surface 2a, and dust accumulated on the water channel bottom surface 2a on the front surface 4a side of the auxiliary screen 4 It can be scraped up sufficiently.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
Most of the dust flowing down the water channel is deposited on the main screen 3 provided in front of the rake circulation dust remover 1. Further, the remaining dust flows below the lower end side 3 a of the main screen 3 and flows to the front surface 4 a of the auxiliary screen 4 installed below the lower end side 3 a of the main screen 3 or the front surface of the auxiliary screen 4. The dust deposits on the water channel bottom surface 2a in front of 4a, and part of the dust also adheres to the concave arc portion on the upper side 4b of the auxiliary screen 4.

  On the other hand, the rake 5 that scoops up the dust deposited on the main screen 3 and the auxiliary screen 4 circulates and moves around the rake circulation dust remover 1 in the vertical direction. That is, the rake 5 having both ends connected to the pair of main chains 1b circulates and moves together with the main chain 1b by a pair of main chains 1b that circulates in the vertical direction when driven by a drive sprocket (not shown). To do.

  The rake 5 that circulates by the pair of main chains 1b that circulate moves downward behind the main screen 3 so that the lower inversion portion 6, that is, the end of the semicircular arc-like lower end side 3a of the main screen 3, and the lower part thereof The movement is reversed from the downward movement to the upward movement while passing through a gap with the concave arc portion on the upper side 4b of the auxiliary screen 4 installed in the upper side.

  While passing through the gap between the end of the semicircular arc-like lower end side 3 a of the main screen 3 and the concave arc portion of the upper side 4 b of the auxiliary screen 4, the front comb teeth 5 b of the rake 5 are comb-shaped auxiliary screens 4. The rake flat portion 5c on the base end side scrapes off the dust deposited on the concave arc portion on the upper side 4b of the auxiliary screen 4 while passing through the gap.

  When the front comb teeth 5b of the rake 5 that have passed through the gaps of the comb-shaped auxiliary screen 4 exit the front surface 4a of the auxiliary screen 4, the rake tip L-shaped bent portion 5d at the tip of the front comb teeth 5b is substantially horizontal. In the direction and comes out before the rake flat part 5c. A substantially horizontal orientation rake tip L-shaped bent portion 5d of the auxiliary screen 4 that is substantially perpendicular to the front surface 4a is scraped while the tip of the L-shaped bent portion 5d pierces dust collected on the front surface 4a of the auxiliary screen 4. take. The front comb teeth 5b of the rake 5 that have come out on the front surface 4a of the auxiliary screen 4 are scraped up and accumulated on the water channel bottom surface 2a immediately before the front surface 4a of the auxiliary screen 4 while reversing from the downward movement to the upward movement. Further, since the rake 5 has an L-shaped bent end, it is easy to catch dust, and when the rake 5 moves upward along the front surface of the main screen 3 of the rake 5, the bent end of the rake 5 is bent. Because the direction is upward, once captured dust is difficult to drop off.

  Since the front surface 4 a of the auxiliary screen 4 is located at or near the lowermost position of the lower reversing portion 6 of the rake 5, the front comb teeth 5 b of the rake 5 that is reversed by the lower reversing portion 6 are formed on the front surface 4 a of the auxiliary screen 4. When exiting, the tip of the front comb tooth 5b passes near the lowermost end of the front surface 4a of the auxiliary screen 4 and its protruding length increases, and scrapes the dust collected near the lowermost end of the front surface 4a of the auxiliary screen 4 Therefore, it is possible to further increase the scraping capacity of the dust rake 5 attached to the front surface 4 a of the auxiliary screen 4.

  Further, when the front comb teeth 5b of the rake 5 that is inverted by the lower reversing portion 6 comes out to the front surface 4a of the auxiliary screen 4, the front comb teeth 5b are closest to the water channel bottom surface 2a and the gap is minimum or minimum. Therefore, the dust accumulated on the water channel bottom surface 2a can be effectively scraped.

  Then, the rake 5 that scoops up the dust deposited on the front surface 4 a of the auxiliary screen 4 and the dust deposited on the water channel bottom surface 2 a immediately before the front surface 4 a of the auxiliary screen 4 is a lower reversing portion 6, that is, a semicircle of the main screen 3. The upper side of the arc-shaped lower end side 3a moves upward along the front surface of the main screen 3 slightly inclined to the downstream side.

  The rake 5 moves up along the front surface of the main screen 3 and also picks up dust collected on the front surface of the main screen 3. The rake 5 then picks up the dust in a dust conveyor (not shown) installed above the water channel 2. Drain the dust. The discharged rake 5 is reversed and moved downward at the upper part of the rake circulation dust remover 1, moved downwardly behind the main screen 3, and the same operation is repeated thereafter.

Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention. As described above, the downward arc shape toward the downstream side of the lower end side 3a of the main screen 3 is formed from the lower half semicircular plate 3b as shown in FIG. 1 (A). As shown in FIG. 2, the lower end 3a may be formed of a plate piece bent downward in a convex shape, for example, a plate piece 3c bent downward in a semicircular arc shape, or a circular plate as shown in FIG. It may be formed from the lower half side of 3d, or may be formed from a lower half semi-regular polygon plate piece 3e as shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS (A) is a principal part side view of the rake circulation type dust remover with an auxiliary screen which shows the best form for implementing this invention. (B) is a partial plan view of a rake showing the best mode for carrying out the present invention. (C) is a side view of a rake showing the best mode for carrying out the present invention. It is a principal part side view of the other rake circulation type dust remover with an auxiliary screen which shows the best form for implementing this invention. It is a principal part side view of the other rake circulation type dust remover with an auxiliary screen which shows the best form for implementing this invention. It is a principal part side view of the other rake circulation type dust remover with an auxiliary screen which shows the best form for implementing this invention. It is a principal part side view of the conventional rake circulation type dust remover with an auxiliary screen.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rake circulation type dust remover 1a Frame 1b Main chain 1c Guide groove 1d Main chain lower reversing part 1e Screen receiver 2 Water channel 2a Water channel bottom surface 3 Main screen 3a Lower end 3b Lower half semicircular plate 3c Plate piece 3d Circular plate 3e Lower half Semi-regular polygonal plate 4 Auxiliary screen 4a Front surface 4b Upper side 4c Rear surface 5 Rake 5a Base 5b Front comb teeth 5c Rake flat part 5d Rake tip L-shaped bent part 6 Lower reversing part A Trajectory of the rake tip

Claims (8)

A rake that moves up the front of the main screen in the form of a vertical grid installed in the waterway, moves down the back of the main screen, circulates in the vertical direction, and reverses from the downward movement to the upward movement at the lower reversing part below the main screen. The rake circulating dust remover is configured to scrape dust collected on the front of the main screen with a rake that moves upward along the front of the main screen and discharges it above the water channel. Provided on the inner side of the lower reversing part and formed in an arc shape toward the downstream side, an auxiliary screen is provided on the outer side of the lower reversing part of the rake and on the downstream side of the lower end side of the main screen, and the front surface of the auxiliary screen is Make the upper end of the front of the auxiliary screen approximately perpendicular to the lower position of the lower reversal part of the rake, and extend the upper end of the auxiliary screen to a high position inside the trajectory of the front comb teeth tip of the rake. The length of the front comb tooth tip of the rake when passing through a substantially vertical front surface of the screen is increased from the upper front end of the auxiliary screen, and the front comb tooth tip of the rake has an L-shaped comb shape when viewed from the side. The rake tip L-shaped bent portion which becomes the tip of the front comb teeth comes out in a substantially horizontal direction before the rake flat portion which forms the base end side of the front comb teeth at the lower reversing portion and comes out on the front surface of the auxiliary screen. A rake circulation dust remover with an auxiliary screen, characterized in that it comes. The rake circulation type dust remover with an auxiliary screen according to claim 1, wherein the front surface of the auxiliary screen is vertically opposed to the lowest position of the lower inverting portion of the rake. The rake circulation type dust remover with an auxiliary screen according to claim 1, wherein the upper side of the auxiliary screen is formed in a shape corresponding to the shape of the movement path of the rake in the lower reversing part. The rake circulation type dust remover with an auxiliary screen according to claim 1, wherein the arc shape on the lower end side of the main screen is formed from a lower half semicircular plate. The rake circulation type dust remover with an auxiliary screen according to claim 1, wherein the arc shape on the lower end side of the main screen is formed from a plate piece that is bent downwardly on the lower end side of the main screen. The rake circulation type dust remover with an auxiliary screen according to claim 5, wherein the arc shape on the lower end side of the main screen is formed from a plate piece bent in a semicircular arc shape with the lower end side of the main screen downward. The rake circulation dust remover with an auxiliary screen according to claim 1, wherein the arc shape on the lower end side of the main screen is formed from the lower half side of the circular plate. The rake circulation dust remover with an auxiliary screen according to claim 1, wherein the arc shape on the lower end side of the main screen is formed from a lower half semi-regular polygon plate.

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