JP2003300018A - Sieve apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in sorting a material in which a foreign matter such as a wire is mixed by using a conventional vibration type screen, the foreign matter (wire) caught in the sieve bar of a screen member is not discharged by only the vibration of the screen member, and a mesh tends to clog. <P>SOLUTION: A rotating transfer body 2 having a plurality of blade plates 23 and a screen member 4 with a plurality of sieve bars 41 arranged at the undersurface side of the rotating transfer body 2 at predetermined small intervals parallel to the rotating direction of the rotating transfer body are provided in the housing 1. The upper surface of the screen member is shaped as concave arcuate surface having almost the same curvature as that of a moving locus surface at the tip part of the blade plate of the rotating transfer body 2, and the screen member 4 is disposed in a manner such that the concave arcuate surface of the upper surface of the screen member is close to the moving locus surface of the tip part of the blade plate of the rotating transfer body with a minute interval. Thus, the material to be sorted on the upper surface of the screen member is forcibly discharged by each blade plate tip part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sieving device for separating a substance to be separated into a fine substance and a coarse substance.

[0002]

2. Description of the Related Art In a refuse incineration facility, various kinds of waste such as general waste and industrial waste are incinerated in an incinerator to generate a large amount of incinerated ash. Then, this incinerated ash is melted in the next step. By the way, in the incineration ash discharged from the incinerator, small granular (or fine) fine particles and relatively large lump-shaped coarse particles are mixed. Done. Therefore, in order to melt-process the incineration ash (which is the object to be separated, which is the subject of the present application), it is first necessary to separate the incineration ash into a fine product and a coarse product.

Conventionally, in a refuse incineration facility, a sieving apparatus called a vibrating screen as shown in, for example, FIGS. 6 to 7 is generally used for separating incinerated ash. In the conventional sieving apparatus shown in FIGS. 6 to 7, the inside of the horizontally long box-shaped housing 101 is divided into two upper and lower chambers by a screen member 104, and the upper chamber 114 is used as a passage for the coarse material C.
The lower chamber 115 serves as a passage for the fine article B. The upper chamber 1
The upper opening of 14 is covered with cover plates 116, 116 ...

One end side of the housing 101 (left side in FIG. 6)
At the front end of the screen member 104, there is formed an object to be separated 111 into which the object to be separated A is introduced. On the other end side (right side in FIG. 6) of the housing 101, a fines discharge port 112 for discharging the fines B to the right end of the lower chamber 115 and a coarses for discharging the coarses C to the right end of the upper chamber 114. The discharge port 113 is formed respectively.

The housing 101 is supported by a stand via anti-vibration springs 102 and 102 in a state in which the housing 101 is slightly inclined downward from the insertion port 111 side toward the ejection ports 112 and 113 sides. Then, the housing 101 is vibrated by the vibration motor 103.

In this conventional example, the screen member 104 includes a plurality of sieve bars 141, 141, ... As shown in FIG.
Are arranged in parallel with a predetermined small interval (gap 142). The screen member 104 is not limited to one in which a plurality of sieve bars 141 are arranged in parallel, but a mesh member is also widely used.

This conventional sieving apparatus is installed in a refuse incinerator with the inlet 111 connected to the incineration ash discharge passage from the incinerator. Then, when the vibration motor 103 is driven, the incineration ash (material to be separated) A charged from the charging port 111 is vibrated on the screen member 104, and the coarse material C remains therein on the screen member 104. The fine product B falls into the lower chamber 115 through the gap 142 between the sieve bars 141 and 141, and is separated into the fine product B and the coarse product C. Then, the fine article B of the lower chamber 115 and the upper chamber 114
The coarse material C is moved to the descending slope side (right side in FIG. 6) by vibration, and is discharged from the fine material discharge port 112 and the coarse material discharge port 113 in a sorted state. The fine material B discharged from the fine material discharge port 112 is supplied to the melting furnace through the magnetic separator and melted therein, while the coarse material discharge port 1
The crude product C discharged from 13 is discarded as a foreign substance.

[0008]

By the way, in the incineration ash incinerated in the refuse incineration facility, there is a case where slender foreign matter such as wire is mixed without being incinerated. Foreign matter (eg, wire) is input port 111
When the foreign matter (wire) is supplied to the screen member 104 from the screen member 104, the foreign substance (wire) is caught by the sieve bars 141 of the screen member 104 as shown by reference numeral C ′ in FIGS. The foreign matter C'may not move downstream.

Then, in this way, the screen member 104
When the foreign matter C ′ is caught on the top and becomes immobile, other foreign matter and coarse material C that follow are sequentially (gradually) blocked,
There is a problem that the gap 142 of the screen member 104 is clogged, normal separation work cannot be performed, and further separation becomes impossible. In that case, it is necessary to stop the operation, remove the cover plate 116 of the upper chamber 114, and manually clean the clogged portion of the screen member 104 by an operator.

When the sieving device is used by connecting it to the incineration ash discharge passage from the incinerator, when the sieving device is stopped to remove the clogging of the screen member 104 as described above, It is necessary to stop the supply of incineration ash from the upstream side, which will affect the operation of equipment other than this screening device.

In view of the problems of the above-described conventional sieving apparatus, the present invention eliminates the foreign matter that is easily caught on the screen member such as wire in the material to be separated (for example, incinerated ash). An object of the present invention is to provide a sieving device that can be automatically removed from the screen member.

[0012]

The present invention has the following constitution as means for solving the above problems. still,
The present invention is directed to a sieving device for separating an object to be separated such as incinerated ash generated in a refuse incineration facility into a fine material and a coarse material.

The invention according to claim 1 of the present invention is directed to a sieving apparatus according to the invention according to claim 1 of the present invention, wherein a housing capable of accommodating an object to be separated and a plurality of blades provided in the housing at a predetermined angular interval around a rotation axis. A rotary transfer body to which a plate is attached, a drive device for rotating the rotary transfer body, and a plurality of sieve bars on the lower surface side of the rotary transfer body in the housing are parallel to the rotation direction of the rotary transfer body at a predetermined small interval. And a screen member arranged in the.

The rotary transfer body is rotated at a low speed of, for example, about 2 to 3 revolutions per minute by a driving device (motor). The rotation speed (2 to 3 rotations per minute) of the rotary transfer body is not particularly limited and can be set appropriately.
Further, the rotation speed of the rotary transfer body can be made variable.

The vanes of the rotary transfer member are 4 to 4 at equal angular intervals.
It is preferable to use about 10 sheets, but if the number is 2 or more, an appropriate number can be used. Further, each vane plate has the same length from the center of rotation to the tip, and the movement locus surfaces of the vane plate tips are all at the same position. In addition, as a material of each vane plate, a metal plate (for example, a steel plate) having heat resistance and wear resistance is preferable.

Interval (gap) between each screen rail of the screen member
Can be appropriately set depending on the application, but when it is used for separating incinerated ash, for example, it is advisable to provide a gap of about 2 to 4 mm between the sieve bars. It should be noted that the gap between the screen bars is the mesh of the screen member, and this gap may be referred to as the mesh.

The upper surface of the screen member is a concave arc surface having substantially the same curvature as the movement locus surface of the tip of the blade of the rotary transfer member. The screen member is installed in such a manner that the concave arc surface on the upper surface thereof is in close proximity to the movement locus surface of the blade tip of the rotary transfer member with a minute interval (for example, an interval of about 1 mm). The screen member is installed in a predetermined angle range (for example, an angle range of about 110 ° to 130 °) on the lower surface side of the rotary transfer body.

In the housing, a separated material inlet for introducing the separated material on the starting end of the screen member, a fine material outlet under the screen member, and a coarse material outlet under the end portion of the screen member. And are provided respectively. When using this sieving device in a waste incineration facility, for example, connect the material to-be-separated object inlet to the incinerator ash discharge passage on the incinerator side, and the fine product outlet to the incinerator ash supply passage on the melting furnace side. And connect the coarse material discharge port to the foreign matter discharge passage.

The sieving apparatus of the first aspect functions as follows. That is, when the rotary transfer body is rotated by the drive device, the positions of the tip ends of the blades of the rotary transfer body approaching the concave arc surface of the upper surface of the screen member are sequentially moved from the start end side to the end side of the screen member. Go. Then, the material to be separated from the object to be separated (for example, incinerated ash from the incinerator side)
Is charged, the object to be separated is moved from the screen member start end side to the screen member end part side through the bottom of the concave arc surface in a space between the two blade plates,
In the meantime, fine particles having a particle size smaller than the sieve mesh of the screen member among the objects to be separated fall through the sieve mesh of the screen member toward the fine material discharge port side, and a large-diameter or long coarse material is screened. It is swept out from the end of the member toward the coarse material discharge port, and the fine material and the coarse material are automatically separated.

By the way, when the object to be separated contains a long and slender foreign matter such as wire, the foreign matter (for example, wire) may be caught on the screen crosspiece of the screen member while being transported on the screen member. However, in the sieving apparatus according to the first aspect of the present invention, since the tip of each blade is moved to a position close to the concave arc surface on the upper surface of the screen member,
When the foreign matter caught on the screen crosspiece is exposed on the upper surface of the screen member, the foreign matter can be forced out by the tip of the blade toward the blade advancing side. At this time, since each sieve bar of the screen member and each sieve mesh therebetween are parallel to each other in the rotation direction of the rotary transfer body, the foreign matter can be smoothly swept out to the outside of the terminal end portion of the screen member.

Invention of Claim 2 of the Invention In the invention of Claim 2 of the present application, in the sieving apparatus of Claim 1, the blade-like concavo-convex portion is formed at the tip of each blade, and each blade is also formed. Is characterized by being formed of a thin plate metal material having a spring property.

According to the second aspect of the present invention, a blade plate (referred to as Inconel) having a thickness of about 0.2 to 0.5 mm can be used as the blade plate. Further, the blade plate can be elastically deformed (flexed) in the thickness direction at its tip end side.

In the sieving apparatus according to the present invention, since the blade plate tip portion is provided with saw-tooth-like irregularities, the portion close to the top surface of the screen member (the tip of each protrusion) is a point. Therefore, it becomes difficult for foreign matter to be caught between the upper surface of the screen member and the tip of the blade during operation. or,
Even if foreign matter is caught between the upper surface of the screen member and the tip of the blade, since the tip of the blade has a spring property, the portion of the blade where the foreign matter is caught bends to overcome the foreign matter. , The vane plate is not overloaded.

Invention of Claim 3 of the Invention In the invention of Claim 3 of the present invention, in the sieving apparatus of Claim 2, the concavo-convex portion at the tip of each vane plate has the convex portions at equal intervals in the axial direction of the rotating shaft. While forming, each blade is
It is characterized in that the respective convex portions are attached in such a manner that the respective convex portions are sequentially displaced slightly in the axial direction of the rotary shaft.

The intervals between the convex portions of the concave and convex portions at the tip of the blade plate can be formed at equal intervals of, for example, about 15 to 30 mm (not particularly limited). Further, although the intervals between the convex portions on each vane plate are all the same, the forming positions of the convex portions on each vane plate are formed so as to be slightly shifted in the axial direction of the rotating shaft. The deviation width of the convex portions on each vane plate is set to a value obtained by dividing the interval between the convex portions (for example, a specific interval in the range of 15 to 30 mm) by the number of vane plates used for the rotary transfer body. That is, for example, when the distance between the convex portions of the blade plate is 20 mm and the number of blade plates used for the rotary transfer body is eight, the convex portion of a predetermined blade plate and the convex portion of the next blade plate are convex. 2.5mm (20mm / 8) of the axial deviation from the part
As a rule, the concavo-convex portion on each vane plate has the same width (2.5 m
m) Form by shifting. With this configuration, when the rotary transfer body rotates, the convex portions of the blades move (rotate) at positions displaced by a predetermined width (2.5 mm) in the axial direction of the rotary shaft.

By the way, when the uneven portion is formed at the tip of the blade plate, the concave portion between the respective convex portions is a space portion.
When the fraction to be separated on the screen member has a diameter smaller than the space of the recess (larger than the sieve mesh), it is considered that the recess straddles the fraction to be separated having a small diameter and cannot be transferred by the blade plate. . However, in claim 3, since the convex portion forming position of each vane plate which is sequentially circulated is displaced in the axial direction of the rotating shaft, if the fraction to be separated on the screen member is a specific vane plate tip portion. Even if the concave portion may straddle, the object to be separated can be pressed and moved by the convex portion of one of the blade plates during one rotation of the rotary transfer body.

Invention of Claim 4 of the Invention The invention of claim 4 of the present application is the sieving apparatus according to any one of claims 1 to 3, wherein each screen rail of the screen member is a plate member having a predetermined small thickness. And use each of the sieve bars in a vertical position, and make each sieve bar a wedge-shaped cross-section so that the thickness of the lower surface side is thinner than the thickness of the upper surface side, and widen each gap between the respective screen rails in a downward expansion shape. It is characterized by being.

Although each screen rail of the screen member is not particularly limited, for example, the plate width is about 60 mm, the upper surface side thickness is about 4 mm, and the lower surface side thickness is about 1 mm. Uses a steel plate that has been made. Then, in the screen member in which each screen rail is installed with its plate width direction oriented vertically, the strength in the vertical direction becomes strong. In addition, when each gap (becomes the sieve mesh) between each sieve bar is expanded downwardly,
A fine object dropped from the upper surface side between the gaps (sieves) will not be blocked in the middle of the gaps.

[0029]

The sieving apparatus of the present invention has the following effects.

The sieving device of the present invention effects the claims 1 of the present invention of claim 1, as described above, the lower surface side of the rotary transfer member mounted a plurality of blades around the rotation axis, a plurality The screen member is formed by arranging two sieve bars at a predetermined small interval in parallel with the rotation direction of the rotary transfer member, and the upper surface of the screen member has substantially the same curvature as the movement trajectory surface of the tip of the blade plate of the rotary transfer member. The screen member has a concave arc surface, and the screen member is arranged such that the concave arc surface on the upper surface thereof is in close proximity to the movement locus surface of the tip of the blade of the rotary transfer member at a minute interval. Then, when the rotary transfer member is rotated, the position where the tip of each blade of the rotary transfer member approaches the concave arc surface of the screen member upper surface is sequentially moved from the start end side to the end end side of the screen member. Thus, it is possible to sequentially and compulsorily sweep out the fractionated substance (coarse substance) remaining on the screen member toward the terminal end side of the screen member.

Therefore, in the sieving apparatus according to the first aspect,
Even if a foreign matter (e.g., a long and slender foreign matter such as a wire) in the object to be separated is caught at the screen cross section of the screen member, the foreign matter can be forcibly transferred by each blade of the rotary transfer body, and the screen member This has the effect of automatically preventing the clogging of the. In addition, if the screen member can be automatically prevented from being clogged in this way, the work for removing the clogging unlike the conventional case becomes unnecessary (or the number of times can be reduced). The operating efficiency of the dividing device can be improved.

The effect of the invention of claim 2 of the present invention is that the invention of claim 2 of the present invention is such that, in the sieving apparatus of the above-mentioned claim 1, a saw-toothed concavo-convex portion is formed at the tip of each blade. The blades are made of a thin metal material having a spring property.

Therefore, in the sieving apparatus according to the second aspect,
In addition to the effect of claim 1, there is an effect that foreign matters are less likely to be caught between the upper surface of the screen member and the tip of the blade plate during operation by forming the blade plate tip portion with saw-toothed concavo-convex portions. . Further, since the blade plate has a spring property, even if a hard foreign matter is caught between the upper surface of the screen member and the tip of the blade plate, the blade plate can be bent and overcome the foreign matter. There is an effect that an excessive load (tension) is not applied between the plate and the screen member, and damage to the blade plate or the screen member can be prevented.

Effect of the Invention of Claim 3 The invention of Claim 3 of the present application is the sieving apparatus of Claim 2 in which the concavo-convex portion at the tip of each vane plate has each convex portion in the axial direction of the rotating shaft. Formed with a gap, each vane,
The respective convex portions are attached in such a manner that they are sequentially displaced by a little width in the axial direction of the rotary shaft.

In the case where the blade plate tip portion is provided with a concave-convex portion, the concave portion between the convex portions becomes a space portion, but the convex portion positions of the respective blade plates are sequentially displaced by a slight width in the axial direction. Then, the convex portions of the other blades move in the portions corresponding to the concave portions (space portions).

Therefore, in the sieving apparatus according to the third aspect,
In addition to the effect of the above-mentioned claim 2, even if the convex portion of the blade plate tip is advanced over the entire width direction of the screen member and the concave and convex portion is formed on the blade plate tip portion, the object on the screen member is not covered. It has an effect that the separated matter does not remain unswept.

Effect of the Invention of Claim 4 The invention of Claim 4 of the present application is the sieving apparatus according to any one of Claims 1 to 3, wherein each screen rail of the screen member has a predetermined small thickness. The plate material is used in a vertical position, and each sieve bar has a wedge-shaped cross-section so that the thickness of the lower surface side is thinner than the thickness of the upper surface side, and the gap between the sieve bars is widened downward. .

Therefore, in the sieving apparatus according to the third aspect,
In addition to each of the effects of claims 1 to 3, the screen member has a high strength in the vertical direction, and fine objects that have fallen into the gaps (sieves) between the sieve bars do not become blocked in the middle of the gaps. There is an effect that the members are less likely to be clogged.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION A sieving apparatus according to an embodiment of the present application will be described with reference to FIGS. The sieving apparatus of this embodiment is used for separating the object A to be fractionated, in which the small-diameter fine material B and the large-diameter coarse material C are mixed, into the fine material B and the coarse material C. The sieving apparatus of this embodiment can be used to separate the incineration ash discharged from the incinerator into a fine product and a coarse product in the refuse incineration facility. There is a thing.

The sieving apparatus of this embodiment is shown in FIGS.
As shown in FIG. 1, a housing 1 capable of containing a material to be separated (incineration ash) A, a rotary transfer body 2 installed in the housing 1, a drive device 3 for rotating the rotary transfer body 2, and a housing 1 And a screen member 4 installed on the lower surface side of the rotary transfer body 2.

The housing 1 of this embodiment has a front-rear width (left and right width in FIGS. 1 and 2) of 90 to 100 cm, a left and right width (right and left width of FIG. 3) of 60 to 70 cm, and an overall height of 90 to 1 cm.
It is designed to have a size of about 00 cm. The design of the size of the housing 1 can be changed appropriately.

In the rotary transfer body 2, a total of eight vane plates 23, 23 ... Are attached around the rotary shaft 21 at equal angular intervals (45 ° intervals), and each vane plate 23, 23.
The side plates 22 and 22 made of circular plates are attached to the respective left and right ends of. The rotary transfer member 2 is designed such that the outer diameter of the side plate 22 is 40 to 50 cm and the distance between the outer surfaces of the side plates 22 and 22 is about 50 to 60 cm. still,
The design of the size of the rotary transfer body 2 is appropriately changed according to the volume inside the housing 1.

Each vane plate 23, 23 ... Has a thickness of 0.2.
A blade plate (referred to as Inconel) having a spring property of about 0.5 mm is used so that the blade plate tip side can be elastically deformed (flexed) in the thickness direction. The vane plate 23 has heat resistance and wear resistance. The vane plates 23, 23 ... Are fixed by bolting the base end side to mounting plates 27, 27.

Saw-toothed concavo-convex portions 24 are formed at the tip portions of the blade plates 23 ,. In the uneven portion 24, the convex portions 26 projecting in an acute angle shape (mountain shape having an angle of 60 °) are regularly connected at regular intervals, and the convex portions 26, 2 are formed.
A recess 25 is formed between each of the six. In this embodiment, the distance L (FIG. 4) between the protrusions 26, 26 is about 20 mm.
And the maximum depth of the recess 25 is about 14 mm.

Further, each blade 23, 23 ... (8 pieces in total)
As shown in FIG. 5, the uneven portions 24, 24, ...
The position 6 is slightly shifted in the axial direction of the rotary shaft 21 by the width M. That is, in this embodiment,
The distance L (about 20 mm) between the convex portions 26, 26 is the same in each of the blade plates 23, 23, ... However, the position of the convex portion 26 of the blade plate 23 that comes around in the next order is set to the leading side blade plate. 23
The protrusions 26 are formed in such a manner that they are sequentially displaced from the position of the convex portion 26 by a width M (M = 2.5 mm in this embodiment) in the rotation axis direction.

The tips of the vane plates 23, 23, ... Are projected to the same positions as the outer peripheral surfaces of the side plates 22, 22 at the left and right ends. That is, in this embodiment, the uneven portion 24 is formed at the tip of the blade plate, and each of the convex portions 26, 26, ... Becomes the tip of the blade plate. Therefore, the tip corners of each of the convex portions 26, 26 ... Then, as will be described later, when the rotary transfer body 2 is rotated about the rotary shaft 21, the tips of the vane plates 23, 23 ,. become. The movement locus surface of the tip of each blade is at the same position as the outer peripheral surface of the circular side plate 22 in FIG. 2 in a side view.

As shown in FIG. 3, the rotary transfer member 2 is mounted in a horizontal position by supporting the end portions of the rotary shaft 21 on the left and right side walls of the housing 1 by bearings 15 and 15, respectively. The rotary transfer body 2 is mounted near the center of the housing 1 as shown in FIG.

The drive device 3 for rotating the rotary transfer body 2 is
Motor 31, speed reducer 32, drive side sprocket 33
And a driven side sprocket 34 attached to the rotary shaft 21,
It is composed of a chain 35 wound around both sprockets 33, 34. Then, the drive device 3 includes a motor 31
Is operated, the rotary transfer body 2 can be rotated at a low speed of, for example, 2 to 3 revolutions per minute. The rotation speed of the rotary transfer body 2 can be made variable by using the motor 31 of a variable rotation speed type.

As shown in FIGS. 2 to 4, the screen member 4 has a plurality of sieve bars 41, 41, ... Arranged in parallel with the rotation direction of the rotary transfer body 2 with a predetermined small interval (gap 42). .. are connected by connecting plates 43, 43 (FIG. 2).

As shown in the enlarged view of FIG. 4, each of the sieve bars 41, 41 ... Is formed of a steel plate having a predetermined small thickness and has a wedge-shaped cross section. That is, in this embodiment, the blade plate 23 has a wedge-shaped cross-section with a plate width (vertical width in FIG. 4) of 50 to 60 mm, an upper surface side thickness of about 4 mm, and a lower surface side thickness of about 1 mm.
As shown in FIG. 5, the upper surface (reference numeral 4c) is designed to have a concave arc shape having substantially the same curvature as the movement locus surface of the tip of the blade plate 23. Further, as shown in FIG. 2, the sieve bar 41 has a length corresponding to a range of about 1/3 (angle of about 120 °) in the circumferential direction of the rotary transfer body 2.

As shown in FIGS. 3 and 4, the sieve bars 41, 41, ... Are arranged in parallel with a predetermined small interval (gap 42) serving as sieve meshes. Since it has a wedge shape, the gap 42 formed between the two sieve bars 41, 41 is narrow on the upper surface side (width D = about 3 mm),
The lower surface side is widened (width E = about 6 mm) and expanded downward. Further, as shown in FIG. 2, an upper surface 4c of the screen member 4 assembled with the sieve bars 41, 41, ... Is concave with a curvature substantially the same as the movement trajectory surface of the tip of the blade of the rotary transfer member 2. It has an arc surface.

In the screen member 4, as shown in FIG. 2, the screen member upper surface 4c on the lower surface side of the rotary transfer member 2 is in a minute interval (for example, about 1 mm) on the movement trajectory surface of the tip of the blade of the rotary transfer member 2. The connection plates 43, 43 at both ends are fixed by bolting them in a state of being close to each other with a space of.

The housing 1 is provided with an object-to-be-sorted object inlet 11 for introducing the object-to-be-sorted A onto the starting end portion 4a of the screen member 4.
A fine material discharge port 12 is provided below the screen member 4, and a coarse material discharge port 13 is provided outside the terminal end portion 4b of the screen member 4. An inspection port 16 closed by an upper lid 17 is formed on the upper surface of the housing 1, and an inspection port 18 closed by a side lid 19 is formed on the rear side surface of the housing 1.

The sieving apparatus of this embodiment functions as follows. When the sieving apparatus of this embodiment is used, for example, in a refuse incinerator, the fractionated material inlet 11 is connected to the incinerator ash discharge passage from the incinerator, and the fine material outlet 12 is connected to the melting furnace. It is connected to the incineration ash supply passage and the coarse material discharge port 13 is connected to the foreign matter discharge passage.

Then, when the rotary transfer body 2 is rotated by the drive device 3, as shown in FIG. 2, the tip ends of the vane plates 23, 23 ... Of the rotary transfer body 2 are recessed on the upper surface 4a of the screen member 4. The positions close to the arc surface are sequentially moved from the starting end 4a side of the screen member 4 to the ending end 4b side. Then, when the fractionated material (incineration ash) A is fed from the fractionated material feeding port 11, the fractionated material A has two blade plates 2
In the state of entering the space between 3 and 23, it is moved from the screen member starting end portion 4a side to the screen member end portion 4b side through the bottom of the concave arc surface, and in the meantime, the sieve of the screen member 4 among the fractions. The fine material B having a particle size smaller than the mesh (gap 42) passes through the sieve mesh (gap 42) of the screen member and falls toward the fine material discharge port 12 side. Then, the coarse material C remaining on the screen member 4 is sequentially swept out from the screen member terminal end portion 4b to the coarse material discharge port 13 side by each blade plate 23, and the fine material B and the coarse material C are automatically separated. To be done.

By the way, when the object A to be separated contains a long foreign substance such as a wire, the foreign substance (for example, a wire) may be caught on the sieve mesh 42 of the screen member 4 while being transferred on the screen member 4. There is. However, in the sieving apparatus of this embodiment, the tip of each vane plate (each convex portion 26) moves so as to move to a position close to the concave arc surface of the screen member upper surface 4c, so that foreign matter is absorbed by the screen member upper surface 4c. When it is exposed to the outside, each convex portion 2 at the tip of the blade plate
The foreign matter can be forcibly pushed out to the vane plate advancing side by 6. At this time, since each sieve bar 41 of the screen member 4 and each sieve mesh (gap 42) between them are parallel to each other in the rotation direction of the rotary transfer body 2, the foreign matter reaches the outside of the screen member end portion 4b. It can be swept out smoothly.

Further, since the saw-toothed concave-convex portion 24 is formed at the tip of the blade plate, the portion near the tip of the blade plate (each convex portion 26) to the upper surface 4c of the screen member becomes a dot-like shape. It is difficult for foreign matter to be caught between the upper surface 4c of the screen member and the tip of the blade plate (the convex portion 26) during operation.
Further, even if a foreign matter is caught between the screen member upper surface 4c and the convex portion 26 at the tip of the blade plate, the blade plate tip portion has a spring property, so that the foreign matter caught portion of the blade plate 23 is bent. As a result, the foreign matter is overcome and the blade plate 23 is not overloaded (the blade plate 23 is not damaged).

Further, in the case where the concave and convex portion 24 is formed at the tip of the blade plate, the concave portion 25 between the two convex portions 26, 26 is a large space portion (a regular triangular space having a width of 20 mm and a maximum depth of 14 mm). However, since the positions where the convex portions 26 of the respective vane plates 23, 23, ..., which sequentially go around are displaced in the axial direction of the rotary shaft 21, the objects to be separated on the screen member 4 are to be separated. Even if the concave portion 25 at the tip of a specific vane plate may straddle, the object to be sorted can be pressed and moved by the convex portion 26 of one of the vane plates while the rotary transfer body 2 makes one revolution. it can. Therefore, even if the concave-convex portion 24 is formed at the tip of the blade plate, there is no unswept residue on the screen member 4.

Further, in this sieving apparatus, a plate member having a predetermined small thickness is used as each of the screen bars 41, 41, ... Of the screen member 4, and the screen bars 41 are installed in a vertical posture. The screen member 4 has high strength against the pressing force from above. In addition, the screen member 4 is used for each screen bar 4
Since each gap 42 (becomes a sieve mesh) between 1 and 41 is widened downwardly, the small object B (FIG. 4) dropped from the upper surface side between the gaps 42 is formed in the middle of the gap 42. It never gets stuck.

[Brief description of drawings]

FIG. 1 is a plan view of a sieving apparatus according to an embodiment of the present application.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of IV-IV in FIG.

FIG. 5 is an explanatory view of the shape of each blade of the rotary transfer body used in the sieving apparatus of the present embodiment.

FIG. 6 is a cross-sectional view of a conventional sieving device (vibrating screen).

FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

Reference numeral 1 is a housing, 2 is a rotary transfer member, 3 is a drive device, 4 is a screen member, 4a is a start end portion of the screen member, and 4b.
Is the terminal end of the screen member, 4c is the upper surface of the screen member, 11 is the inlet for the material to be separated, 12 is the outlet for the fine material, 13 is the outlet for the coarse material, 21 is the rotating shaft, 23 is the blade plate, and 24 is the uneven portion. , 25 is a concave portion, 26 is a convex portion, 31 is a motor, 41 is a sieve bar, and 42 is a gap (sieve mesh).

Continued front page    (72) Inventor Tanaka Spring             930 Nariai-cho, Takamatsu City, Kagawa Prefecture 10 Co., Ltd.             Inside T-net Japan (72) Inventor Hatsune Murakami             930 Nariai-cho, Takamatsu City, Kagawa Prefecture 10 Co., Ltd.             Inside T-net Japan F term (reference) 4D021 AA12 AB06 CA01 CB01 DA01                       DA13 EA10

Claims (4)

[Claims] 1. A sieving apparatus for separating a substance to be fractionated (A) into a fine substance (B) and a coarse substance (C), comprising a housing (1) capable of containing the substance to be fractionated (A). A rotary transfer body (2) in which a plurality of vane plates (23, 23, ...) Are mounted in the housing (1) around a rotary shaft (21) at a predetermined angular interval, and the rotary transfer body (2). ) Is rotated, and a plurality of sieve bars (41, 41 ...) Are provided on the lower surface side of the rotary transfer body (2) in the housing (1) at predetermined small intervals. A screen member (4) arranged in parallel with the rotation direction of (2), and the upper surface (4c) of the screen member (4) is located at the tip of the blade plate (23) of the rotary transfer body (2). On the one hand, the screen member (4) is formed on the upper surface ( The concave arc surface 4c) is installed in a state in which it is close to the movement locus surface of the tip of the blade plate (23) of the rotary transfer body (2) with a minute gap, and the housing (1) is provided with the screen member. (4)
The separated material input port (11) for inputting the separated material (A) onto the starting end portion (4a) of the same, the fine material discharge opening (12) below the screen member (4), and the screen member (4). ), And a coarse material discharge port (13) below the end portion (4b) of the above (3), respectively. 2. The blade plate (2) according to claim 1, wherein the blade plate (23, 23 ...) Is provided with a saw-toothed concavo-convex portion (24) at the tip thereof.
3, 23 ..) are formed of a thin metal material having a spring property. 3. The uneven portion (24) according to claim 2, wherein each vane plate (23, 23 ...) Has a tip end portion.
Form the convex portions (26, 26 ...) At equal intervals (L) in the axial direction of the rotary shaft (21), and each vane plate (23, 23. , 26 ...)
Are sequentially mounted in such a manner that they are slightly displaced from each other in the axial direction of the rotary shaft (21) by a width (M). 4. The sieve bars (41, 41 ...) Of the screen member (4) according to any one of claims 1 to 3,
A plate material having a predetermined small thickness is used in a vertical orientation, and each sieve bar (41, 41 ...) Has a wedge-shaped cross-section so that the thickness of the lower surface side is smaller than the thickness of the upper surface side. 41,
The sieving device characterized in that each of the gaps (42, 42, ...) Between 41) is expanded downwardly.