JP4850464B2 - Contaminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foreign matter treatment device capable of enhancing the durability of a screen device, preventing any stay of foreign matters, and efficiently and reliably collecting foreign matters in a crushing machine. <P>SOLUTION: Arc-shaped screen members 45 are laminated on each other separately in the vertical direction, a rake shaft 47 having a plurality of rakes 46 moving between the screen members 45 is installed eccentrically from a center 45o of an outer circumferential edge of each screen member 45, a fore-end of each rake 46 is retractable from the outer circumferential edge of each screen member 45, and the collected foreign matters are scraped proximally by the rakes 46. Further, a rear side of each arc-shaped screen member 45 is opened, any stay of the foreign matters inside thereof is prevented, the water flow resistance is reduced, and the durability of a screen device 40 is enhanced. Further, an outer circumferential edge of a rotational track of cutter blades is brought close to the outer circumferential edge of each screen members 45, the fore-end of each rake 46 is retracted from the outer circumferential edge of each screen member 45 to reduce the amount of the foreign matters flowing out downstream between a crushing machine 30 and the screen device 40. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a contaminant treatment apparatus that collects and crushes contaminants in water to be treated such as sewage.

  If contaminants such as empty cans, plastic containers, wood chips, etc., flow into the sewage treatment facility together with the sewage (treated water), it may cause accidents such as clogging or damage in the piping of the sewage treatment facility or the pump. Therefore, devices described in Patent Document 1 and Patent Document 2 are known as devices for preventing such accidents. As shown in FIG. 7, the device described in Patent Document 1 is a combination of an endless loop-shaped open-type mesh screen 2 and a crusher 1 in a sewage channel. It is captured by the mold mesh screen 2, carried into the crusher 1, finely crushed by the crusher 1, and dispersed in sewage.

Further, as shown in FIG. 8, the apparatus described in Patent Document 2 has a fixed bar screen 3 installed obliquely in a water channel, and a crusher 4 is installed at the downstream end of the screen 3. The foreign substances flowing down toward the crusher 4 along the screen 3 are sent to the scraping crusher 4 by the scraper 5 installed at the end of the screen 3.
Japanese Patent Publication No. 7-85781 JP-A-8-226165

  However, the apparatus described in Patent Document 1 has the following problems. Since the screen portion of the mesh screen 2 that moves in the substantially elliptical circular orbit is made of a flexible material such as polyethylene / nylon, the screen portion cannot be strengthened. There was a problem that it was easily damaged and had poor durability. In addition, since the screen is an endless loop type, the screen is doubled, the water flow resistance is increased, and the passage of sewage is hindered. There was a problem that the operation stayed in the screen and operation became difficult. Further, since the screen is a belt surface knitted in a net shape, there is a problem that impurities are easily entangled due to the unevenness, and once the impurities are entangled, it is difficult to unwind.

  Moreover, in the apparatus described in Patent Document 2, as the water flow becomes faster, the component force in the flow direction of the water flow becomes larger than the component force that moves the contaminants along the bar screen. Has been pressed against the bar screen and cannot move along the bar screen and stays there.

  The present invention has been made to solve such problems, and while improving the durability of the screen device, reducing the water flow resistance and improving the passage of water, the screen device is also contaminated. An object of the present invention is to provide a contaminant processing apparatus that can efficiently and surely collect contaminants in a crusher without causing troubles in operation without stagnation.

  In the contaminant treatment apparatus according to the present invention, a screen device that collects contaminants in water to be treated and a crusher that crushes contaminants collected by the screen device are arranged side by side so as to cross the water channel. The screen processing device and the crusher are arranged close to each other. The screen device includes an arcuate screen member that is stacked in a plurality of vertical directions and a plurality of screen devices that are stacked in the vertical direction. The crusher is provided with a rake that is spaced from each other and moves between the stacked arc-shaped screen members, and a rake shaft that supports the rake and extends in the vertical direction. The cutter blade has a cutter blade that rotates as a core and can crush impurities. The outer peripheral edge of the orbit of the cutter blade is close to the outer peripheral edge of the arc-shaped screen member, and the rake axis is the outer peripheral edge of the arc-shaped screen member. By being installed eccentrically from the center, the tip of the rake will protrude from the outer periphery of the arcuate screen member at a position where the outer periphery of the arcuate screen member and the outer periphery of the circular orbit of the cutter blade are close to each other. It is characterized by being able to immerse the dust collected in the screen device and collect it in a crusher.

  According to the contaminant processing apparatus configured as described above, the arc-shaped screen members are stacked in the vertical direction, and the rake shaft including a plurality of rakes moving between the arc-shaped screen members is the outer peripheral edge of the arc-shaped screen member. Therefore, the tip of the rake protrudes from the outer peripheral edge of the arc-shaped screen member, and the foreign matter collected by the arc-shaped screen member can be scraped by the rake. Accordingly, it is possible to prevent the foreign matter from staying or entangled in the arc-shaped screen member, to reduce the water flow resistance and improve the flow of the water to be treated, and to reliably collect the foreign matter in the crusher. . Moreover, since the rear side of the arcuate screen member is opened, the stay of impurities in the arcuate screen member is prevented. Further, since the water flow resistance is reduced, the stress relating to the screen device can be reduced, and the durability of the screen device can be improved. Further, since the outer peripheral edge of the circular orbit of the cutter blade is close to the outer peripheral edge of the arc-shaped screen member and the tip of the rake is immersed from the outer peripheral edge of the arc-shaped screen member, the crusher and the screen device Contaminants flowing out from the space to the downstream side are greatly reduced, and the contaminants can be efficiently and reliably collected in the crusher.

  Here, when the vertical interval between the arcuate screen members is t, the distance x between the outer peripheral edge of the circular orbit of the cutter blade and the outer peripheral edge of the arcuate screen member is 3 ≦ x ≦ t (unit: mm) ) Is a size that does not cause a problem even if it flows out downstream, passes between the screen device and the crusher, and a size that does not want to flow out downstream is Without being able to pass between the screen device and the crusher, it is transferred to the crusher and can be sorted according to the size of the contaminants, and the contaminants can be efficiently and reliably collected in the crusher. .

  Further, the screen device is configured to include a water flow guide portion that can form a flow of water to be treated toward the crusher from a position where the rake rotating and rotating with the rake shaft is directed to the crusher to a position directed to the crusher. If it exists, it will become easy to peel the collected foreign material from the outer periphery of an arc-shaped screen member, and it will become possible to collect a foreign material to a crusher more efficiently and reliably.

  Moreover, the rotational speed of the tip of the rake is preferably 70% or less of the rotational speed of the outer periphery of the cutter blade, and the foreign matter raked by the rake is easily drawn into the crusher, making it more efficient and reliable. Objects can be collected in a crusher.

  Further, if the rake is made of an elastic body, the rake is preferably elastically deformed when a foreign object such as hard timber is sandwiched between the rake and the crusher, so that the rake may be damaged. Be lost.

  According to the present invention, while improving the durability of the screen device, the water flow resistance is reduced to improve the passage of water, and the screen device is free from impurities and does not hinder the operation. It is possible to provide a foreign matter processing apparatus that can be collected in a crusher in a reliable and reliable manner.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a foreign matter processing apparatus of the invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted. 1 is a plan view showing a contaminant processing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing the arrangement of a wedge liner in FIG. 1, and FIG. 3 shows a screen apparatus in FIG. 4 is a plan view showing the rake in FIG. 3, FIG. 5 is a side view showing the rake and the water flow guide plate in FIG. 3, and FIG. 6 is a side view showing the fixing member in FIG. It is.

  As shown in FIG. 1, the contaminant treatment apparatus 100 is installed in a water channel 10 having a rectangular cross section formed by a bottom 10a and side walls 10b and 10c, and collects contaminants in treated water such as sewage flowing through the water channel 10. The screen device 40 that collects and crushes the contaminants when the water to be treated passes and transfers the collected contaminants, and the contaminants transferred from the screen device 40 and the objects to be passed therethrough. And a crusher 30 for crushing impurities in the treated water. In addition, slopes 10 d and 10 e that are directed inward (inward in the width direction) are formed on the side walls 10 b and 10 c of the water channel 10, and a flow of water to be treated toward the screen device 40 and the crusher 30 is formed. Thereby, it can prevent that a foreign material accumulates on the bottom 10a of the side wall side of the water channel 10. FIG.

  The crusher 30 and the screen device 40 are arranged in an installation frame 90 installed so as to cross the water channel 10 and are arranged close to each other. The installation frame 90 is provided with positioning pins (not shown) for positioning the screen device 40 and wedge liners 91 to 93 for positioning the crusher 30. The positioning pins are erected at predetermined positions on the bottom of the installation frame 90, and the wedge liners 91 to 93 are installed on the inner wall surface 90a on the back side of the installation frame 90, as shown in FIG. 91a-93a. As shown in FIG.1 and FIG.2, the wedge liners 91 and 93 installed on both outer sides of the wedge liners 91 to 93 are arranged at the lower part of the installation frame 90, and the wedge liner 92 installed in the center is It is arranged on the upper part of the installation frame 90.

  As shown in FIG. 1, the crusher 30 is installed on the side wall 10 c side (the right side in the figure) of the installation frame 90, and as shown in FIGS. 1 and 2, the crusher 30 introduces the water to be treated into the front surface (the upper side in the figure). A port 30b is formed, and a discharge port 30c for discharging the water to be treated is formed on the rear surface. The discharge port 30c communicates with the downstream side through a discharge port 90b formed in the installation frame 90. The crusher 30 rotatably supports two rotary crushing blades (cutter blades) 32 and 32 around an axis extending in the vertical direction (perpendicular to the paper surface), and the blades 10 of the water channel 10 are engaged with each other. It is arranged side by side in the width direction. Further, the crusher 30 includes a vertical electric motor (not shown) that rotationally drives the rotary crushing blades 32 and 32 at the upper part thereof.

  The crusher 30 is driven by a vertical electric motor so that the rotary crushing blades 32 and 32 are rotated in a direction in which impurities are taken in. The water to be treated is introduced from the introduction port 30 b and passed through the crusher 30. While discharging from the discharge port 30c, the impurities in the water to be treated and the impurities transferred from the screen device 40 are crushed by being sandwiched between the rotary crushing blades 32, 32 and discharged downstream.

  The crusher 30 is provided with wedge liners 36 to 38 for positioning the crusher 30 with respect to the installation frame 90. As shown in FIG. 2, the wedge liners 36 to 38 are installed on the outer wall surface 30 a on the back side of the crusher 30, and are respectively arranged at positions facing the wedge liners 91 to 93 provided on the installation frame 90. Yes. The wedge liners 36 to 38 have slopes 36 a to 38 a facing obliquely downward, and the wedge liners 36 and 38 installed on both outer sides are arranged in the lower part of the crusher 30, and the wedge liner 37 installed in the center is It is arranged in the upper part of the crusher 30. Then, the slopes 36a to 38a of the wedge liners 36 to 38 installed in the crusher 30 come into surface contact with the slopes 91a to 93a of the wedge liners 91 to 93 installed in the installation frame 90, respectively. It is guided and positioned at a predetermined position of the installation frame 90.

  As shown in FIG. 1, the screen device 40 is installed adjacent to the left front of the crusher 30 within the installation frame 90. As shown in FIG. 3, the screen device 40 includes an arcuate screen member 45 in which a plurality of layers are stacked apart from each other in the vertical direction, and an arcuate screen in which a plurality of layers are disposed apart from each other in the vertical direction. A rake 46 that moves between the members 45, a rake shaft 47 that supports the rake 46 and extends in the vertical direction, and a vertical electric motor 48 that rotationally drives the rake shaft 47 are provided.

  The arcuate screen member 45 has a flat plate shape and has a substantially arcuate shape in plan view as shown in FIG. Specifically, a linear shape is formed along the side wall 10b side (the left side in the drawing) of the water channel 10 from the diagonally rear side of the axis 45o to the side of the axis 45o in the arc-shaped screen member 45, and the side wall 10b of the axis 45o. From the side of the side, it forms an arc shape from the front, the side of the side wall 10c side and the rear. Further, the arc-shaped screen member 45 is opened on the side wall 10b side at the rear thereof, and the water to be treated that has passed through the arc-shaped screen member 45 is discharged rearward.

  As shown in FIGS. 1 and 3, each arcuate screen member 45 is spaced apart in the vertical direction and fixed to a plurality of support columns 49 extending in the vertical direction by welding. Between the arc-shaped screen members 45 are eyes through which water to be treated is passed, and impurities larger than the eyes are blocked by the arc-shaped screen member 45. In the present embodiment, the vertical plate thickness of the arcuate screen member 45 is about 9 mm, and the vertical interval t between the arcuate screen members 45 is about 16 mm.

  The rake 46 has a flat plate shape and is made of an elastic body such as hard rubber. Note that the rake 46 may be formed of other elastic bodies such as rubber and leaf springs. As shown in FIG. 4, the tip of the rake 46 has an inclined surface 46a in which the radial length of the front end with respect to the rotation direction of the rake 46 is longer than the radial direction of the opposite back end. ing. The inclination angle θ of the inclined surface 46a is preferably 10 to 45 degrees. Contrary to this, in the case of an inclined surface in which the radial length of the back end with respect to the rotation direction of the rake 46 is longer than the radial direction of the front end on the opposite side, impurities are It will rotate at the tip of the moving rake, and it will not be possible to transfer the impurities well. As shown in FIGS. 3 to 5, the rake 46 is fixed to a rectangular water flow guide plate (water flow guide portion) 50 extending in the vertical direction.

  On one end surface of the water flow guide plate 50 extending in the vertical direction, the plurality of rakes 46 are juxtaposed in the vertical direction so as to extend in the horizontal direction. Further, the water flow guide plate 50 is provided with a plurality of bolting openings 50a and can be attached to and detached from the rake shaft 47 via a fixing member 51 fixed to the rake shaft 47 as shown in FIGS. It is fixed to. The water flow guide plate 50 is rotated together with the rake shaft 47 to change the flow direction of the water to be treated. From the position before the position where the rotating rake 46 is directed to the crusher 30 to the position where the direction is directed, The flow of the to-be-processed water which goes to the crusher 30 is formed, and the collected foreign substance is made easy to peel from the outer periphery of the arc-shaped screen member 45. FIG. The water flow guide plates 50 are arranged at equal intervals (90 degrees in the present embodiment) in the circumferential direction in plan view. For this reason, the resistance by the water to be treated can be dispersed and made uniform (details will be described later). As shown in FIG. 3, the uppermost water flow guide plate 50 includes nine skewers (books) of rakes 46, and the other water flow guide plate 50 includes eleven skewers (books) of rakes 46. By changing the number of skewers of the uppermost water flow guide plate 50, application to various water channels having different water channel heights is possible.

  As shown in FIG. 6, the fixing member 51 includes a pair of halved cylinders 52 and 53 that are divided in the axial direction. A plurality of fixed pieces 54 are formed in a protruding manner (note that only one of them is shown in FIG. 6). The fixed pieces 54 are arranged at an equal angle of 90 degrees in the circumferential direction. Further, the fixed piece 54 is formed with an opening 54a at a position corresponding to the opening 50a of the water flow guide plate 50, and a bolt 55 is inserted into these openings 50a and 54a as shown in FIG. Thus, the water flow guide plate 50 and the fixing member 51 are connected to each other.

  As shown in FIG. 3, the rake shaft 47 is supported at both ends by bearings 56, 57, the lower end side bearing 56 is connected to the lowermost arc-shaped screen member 45, and the upper end side bearing 57 is Connected to the uppermost arcuate screen member 45, the rake shaft 47 is arranged at a position eccentric to the center 45 o (see FIG. 1) of the outer peripheral edge of the arcuate screen member 45. That is, the rake shaft 47 is installed eccentrically with the center 45o of the outer peripheral edge of the arc-shaped screen member 45, so that the leading end of the rotating rake 46 protrudes from the outer peripheral edge of the arc-shaped screen member 45 and is arc-shaped. The outer peripheral edge of the screen member 45 and the outer peripheral edge of the circular orbit of the rotary crushing blade 32 are immersed near each other, and the foreign matter collected by the screen device 40 is scraped and collected into the crusher 30. Yes. Incidentally, in this embodiment, the distance x between the outer peripheral edge of the orbit of the rotary crushing blade 32 and the outer peripheral edge of the arcuate screen member 45 is about 7 mm. The screen device 40 having the arcuate screen member 45, the rake 46, the rake shaft 47, the water flow guide plate 50, and the like has a positioning hole (not shown) fitted in the positioning pin of the installation frame 90 at the lower part thereof. I have.

  Next, a method for installing the foreign matter processing apparatus 100 will be described. First, the installation frame 90 is fixed at a predetermined position in the water channel 10. Next, the positioning pin of the installation frame 90 is fitted into the positioning hole provided in the screen device 40 to position the screen device 40. Further, the crusher 30 is positioned by hanging the wedge liners 36 to 38 of the crusher 30 from above so as to face the wedge liners 91 to 93 of the installation frame 90. In this way, the crusher 30 and the screen device 40 are arranged at predetermined positions of the installation frame 90, and the contaminant processing device 100 is installed in the water channel 10. In addition, after fixing the screen apparatus 40 and the crusher 30 to the installation frame 90, the installation frame 90 may be suspended and installed in the water channel 10.

  In the contaminant processing apparatus 100 configured in this manner, the rotary crushing blades 32 and 32 of the crusher 30 are driven by the vertical electric motor, and the rotary crushing blade 32 on the screen device 40 side (the left side in the drawing) is viewed in plan view. The rotating crushing blade 32 on the side wall 10c side (the right side in the drawing) rotates counterclockwise. Further, the rake shaft 47 of the screen device 40 is driven by the vertical motor 48, and the water flow guide plate 50 and the rake 46 rotate clockwise in plan view. The rotational speed of the tip of the rake 46 is 70% or less of the rotational speed of the outer periphery of the rotary crushing blades 32, 32. Further, since the crusher 30 and the screen device 40 are individually provided with the vertical electric motor, the biting and reversing operation at the time of overload can be individually performed by the crusher 30 and the screen device 40, respectively.

  Here, since the rake shaft 47 is installed eccentrically with the center 45o of the arcuate screen member 45, the tip of the rake 46 is outside the front left side of the outer periphery of the arcuate screen member 45 in plan view. The arcuate screen member 45 passes outside the arcuate screen member 45 on the front and right sides of the outer peripheral edge of the arcuate screen member 45, and enters the arcuate screen member 45 on the rear side of the right side of the outer peripheral edge of the arcuate screen member 45. Immerse yourself in. The contaminants in the water to be treated are collected by the arc-shaped screen member 45 of the screen device 40, and the contaminants collected by the arc-shaped screen member 45 protrude from the outer peripheral edge of the arc-shaped screen member 45. The tip of the rake 46 is scraped and transferred to the crusher 30. Further, since the water flow guide plate 50 rotates together with the rake shaft 47 and forms a flow of water to be treated toward the crusher 30 from a position before the position where the rake 46 is directed to the crusher 30 to a position where the rake 46 is directed. The contaminated foreign matter is easily peeled off from the outer peripheral edge of the arc-shaped screen member 45 and is easily transferred to the crusher 30.

  As described above, according to the contaminant processing apparatus 100, the contaminants are not retained or entangled in the arc-shaped screen member 45, and the water flow resistance is reduced to improve the flow of water to be treated and the contaminants. Can be reliably collected in the crusher 30. Further, since the rear side of the arc-shaped screen member 45 is opened, it is possible to prevent the foreign matter from staying in the arc-shaped screen member 45 and preventing the operation from being hindered. Further, since the water flow resistance is reduced, the stress relating to the screen device 40 can be reduced, and the durability of the screen device 40 can be improved. Further, since the outer peripheral edge of the circular orbit of the rotary crushing blade 32 is brought close to the outer peripheral edge of the arcuate screen member 45 and the tip of the rake 46 is immersed from the outer peripheral edge of the arcuate screen member 45 around this, the crusher The contaminants flowing out from between the screen 30 and the screen device 40 to the downstream side are greatly reduced, and the contaminants can be collected in the crusher 30 efficiently and reliably.

  Further, the distance in the vertical direction between the arcuate screen members 45 is t (t = 16), and the distance x (x = 7) between the outer peripheral edge of the circular orbit of the rotary crushing blade 32 and the outer peripheral edge of the arcuate screen member 45. Satisfies the relationship of 3 ≦ x ≦ t (unit: mm), and foreign matter of a size that does not cause a problem even if it flows out to the downstream side passes between the screen device 45 and the crusher 30, Contaminants of a size that you do not want to flow out cannot pass between the screen device 45 and the crusher 30, but are transferred to the crusher 30 and can be sorted according to the size of the contaminants. In addition, it is possible to collect impurities in the crusher 30. Note that the distance between the outer peripheral edge of the circular orbit of the rotary crushing blade 32 and the outer peripheral edge of the arcuate screen member 45 needs to be 3 mm or more in consideration of manufacturing errors and the like.

  Further, since the screen device 40 includes the water flow guide plate 50, the collected contaminants are easily peeled off from the outer peripheral edge of the arc-shaped screen member 45, and the contaminants are more efficiently and reliably broken. Can be collected.

  Further, since the rotation speed of the tip of the rake 46 is 70% or less of the rotation speed of the outer periphery of the rotary crushing blade 32, the foreign matter scraped by the rake 46 is easily drawn into the crusher 30 and is more efficient. In addition, impurities can be reliably collected in the crusher 30. Incidentally, this has been confirmed by the inventors' experiments.

  In addition, since the rake 46 is made of an elastic body, the rake 46 is preferably elastically deformed when a foreign object such as hard wood is sandwiched between the rake 46 and the crusher 30, so that the rake 46 is suitably deformed. There is no risk of damage.

  Further, since the water flow guide plates 50 are arranged at equal intervals in the circumferential direction, a resistance that opposes the water flow and prevents rotation is applied to one rake (rake group arranged in the vertical direction) 46 in the circumferential direction. However, a force to promote rotation by the water flow acts on the other rake 46 on the opposite side of the one rake 46, and the water flow resistance related to each rake 46 is preferably dispersed. This makes it possible to reduce the rotational power of the machine and save energy. Note that the rakes (the rake groups arranged in the vertical direction) 46 are not limited to four equals in the circumferential direction, and may be two equals, three equals, or five or more equals.

  In addition, by forming the arc-shaped screen member 45 from plastic, the weight can be reduced and the strain can be reduced.

It is a top view which shows the foreign material processing apparatus which concerns on embodiment of this invention. It is a schematic sectional drawing which shows arrangement | positioning of the wedge liner in FIG. It is a longitudinal cross-sectional view which shows the screen apparatus in FIG. It is a top view which shows the rake in FIG. FIG. 4 is a side view showing a rake and a water flow guide plate in FIG. 3. It is a side view which shows the fixing member in FIG. It is a perspective view which shows the conventional apparatus. It is a top view which shows another conventional apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Waterway, 30 ... Crushing machine, 32 ... Rotary crushing blade (cutter blade), 40 ... Screen apparatus, 45 ... Arc-shaped screen member, 45o ... Center of arc-shaped screen member, 46 ... Rake, 47 ... Rake axis, 50 ... water flow guide plate (water flow guide part), 100 ... impurities processing device.

Claims (3)

A screen processing device for collecting contaminants in the water to be treated and a crusher for crushing the contaminants collected by the screen device are arranged in parallel so as to cross the water channel. ,
The screen device and the crusher are arranged close to each other,
The screen device includes an arc-shaped screen member in which a plurality of layers are stacked apart from each other in the vertical direction;
A plurality of rakes arranged in the vertical direction apart from each other and moving between the laminated arcuate screen members;
A rake shaft that supports these rakes and extends in the vertical direction,
The crusher has a cutter blade that rotates about the vertical direction as an axis and can crush impurities.
The outer periphery of the orbit of the cutter blade is close to the outer periphery of the arcuate screen member,
The rake shaft is installed eccentrically with the center of the outer peripheral edge of the arc-shaped screen member, so that the leading end of the rake protrudes from the outer peripheral edge of the arc-shaped screen member to the outside of the arc-shaped screen member. The peripheral edge and the outer peripheral edge of the circular orbit of the cutter blade are immersed near each other, and the foreign matter collected by the screen device is scraped and collected into the crusher .
The screen device includes a water flow guide unit capable of forming a flow of water to be treated toward the crusher from a position before the position where the rake rotating and rotating with the rake shaft is directed to the crusher. Prepared,
When the interval in the vertical direction between the arc-shaped screen members is t,
The contaminant processing apparatus according to claim 1 , wherein a distance x between an outer peripheral edge of the circular orbit of the cutter blade and an outer peripheral edge of the arcuate screen member is 3 ≦ x ≦ t (unit: mm) . Rotational speed of the tip of the rake, contaminants processing apparatus according to claim 1, wherein 70% or less of the rotational speed of the outer periphery of the cutter blade. The rake contaminants processing apparatus according to claim 1 or 2, characterized by being composed of an elastic material.

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