JP2016159287A - Sieving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent passage of an impurity which is longer than setting.SOLUTION: A sieving device includes a sieve part 1 formed by having a prescribed sieve opening 1A, and a guide member 2 which has a bottom surface 2A arranged over the sieve part 1 and facing the sieve part 1 in the vertical direction, and in which a facing interval D between the bottom surface 2A and the sieve part 1 is set shorter than the length L of an impurity S2 which may be included in an object S to be sieved.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sieving device.

  Biomass is an organic resource derived from renewable organisms, excluding fossil resources, such as wood (thinned wood, waste wood, driftwood, etc.), grass, waste, sludge, or tire. Such biomass is finely pulverized, weighed, gasified in a gas furnace, and used as fuel. Since such biomass has various pulverized particle sizes and may be clogged in the piping during conveyance in the pulverized piping or the like, the particle size is large enough to be sieved and clogged in the piping. Need to be removed, especially those that are longer than the setting.

  Conventionally, for example, in Patent Document 1, as a vertical fall prevention sieving machine, in order to sort out impurities having a length longer than the mesh, a sieving part having a sieving plate and a sieving part are supported by being inclined. It is shown that it comprises a machine base and drive means for vibrating the sieve part, and the sieve part is configured to vibrate in a direction perpendicular to the tilt direction.

  Conventionally, for example, in Patent Document 2, as a screen plate and a material sieving device, a screen plate for sieving a substance to prevent clogging of a through-hole and perform sieving simply and efficiently is disclosed. A large number of grooves spaced from each other in a predetermined direction are arranged on the front surface, and a plurality of through holes penetrating from the front surface to the back surface are arranged so that at least a part of the through holes overlap the grooves, and the predetermined direction of the through holes It is shown that the opening edge on the front side is located in front of the groove edge on the front side in the predetermined direction of the groove where the through holes overlap.

JP 2003-334494 A JP 2002-348792 A

  In Patent Document 1, due to the left and right vibrations and the inclination of the sieve plate by the sieve part, the sieve object moves downward while moving in a horizontal and wavy shape, and the sieve object having a size less than the mesh of the sieve plate is It falls from the sieve mesh and is separated from the mesh with a size larger than the mesh. At this time, since the sieve vibrates horizontally, the material larger than the mesh does not become vertical. It prevents the vertical drop from the eyes. However, in Patent Document 1, when the object to be sieved stands on the edge of the sieve mesh, it may fall vertically from the sieve mesh, and it is difficult to reliably prevent the vertical fall. The structure of the driving means that vibrates in the direction perpendicular to the tilt direction is complicated, and is not suitable for sieving a large amount of biomass.

  In addition, although patent document 2 aims at not containing a fiber lump and a foreign material, it is aiming at prevention of clogging of a fiber lump and a foreign material by causing a peeling vortex in a through-hole by a groove, and a thing with a large particle size is used. It does not prevent passing through the through hole.

  This invention solves the subject mentioned above, and it aims at providing the sieving apparatus which can prevent the passage of a long thing longer than a setting.

  In order to achieve the above-mentioned object, a sieving device according to a first aspect of the present invention includes a sieving portion formed with a predetermined sieving mesh, and disposed above the sieving portion so that the sieving portion is vertically oriented. A guide member having an opposing bottom surface and having an opposing distance between the bottom surface and the sieve portion set to be equal to or less than a length of a foreign substance that can be included in the sieved object.

  Normally, impurities do not pass through the sieve of the sieve part, but may pass through the sieve of the sieve part when standing along the vertical direction. Therefore, according to the sieving device of the present invention, the vertical distance between the bottom surface of the guide member and the screen portion is set to be equal to or less than the length of the foreign material, so that the foreign material is vertically moved on the screen portion. Suppress standing along. As a result, it is possible to prevent the passage of impurities longer than the setting.

  In the sieving apparatus according to the first aspect of the present invention, the guide member is provided such that an interval between the bottom surface and the sieving portion can be adjusted.

  According to this sieving device, versatility can be achieved by adjusting the distance between the bottom surface of the guide member and the sieving portion according to the length of various contaminants.

  In the sieving device according to the first aspect of the present invention, the guide member is provided with an opening for dropping the object to be sieved with respect to the sieving portion, and the sieving portion is directly below the opening. A closed portion that is closed without having the sieve mesh is provided at the position.

  If the object to be sieved that falls on the sieve part through the opening of the guide member contains impurities, there is a risk that the impurities will fall in the vertical direction. According to this sieving device, since the closing portion is provided at a position immediately below the opening of the sieving portion, even if a foreign substance stands and falls from the opening, it comes into contact with the closing portion. The passage of objects can be prevented.

  In order to achieve the above-mentioned object, the sieving device of the second invention has a sieving portion formed with a predetermined sieving mesh, and a slope in such a manner that the object to be sieved slides against the sieving portion. And a guide member.

  Normally, impurities do not pass through the sieve of the sieve part, but may pass through the sieve of the sieve part when standing along the vertical direction. Therefore, according to the sieving device of the present invention, when a long object is contained in the object to be sieved, the impurity sliding down the slope of the guide member is inclined to the sieve part while being inclined along the slope. It reaches. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  Moreover, the sieving apparatus of the present invention is characterized in that, in the second invention, the guide member is set so that an angle of the inclined surface is equal to or less than an angle of repose in an assumed contaminant that can be included in the sieved object. To do.

  According to this sieving device, the angle of the inclined surface of the guide member is set to be equal to or less than the angle of repose of the foreign material, so that the foreign material moves along the inclined surface in order to prevent the foreign material from rolling on the inclined surface. It slides down in an inclined state and reaches the sieve section. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  In the sieving apparatus according to the second aspect of the present invention, the guide member is characterized in that the angle of the inclined surface is set to 40 degrees or less with respect to the horizontal.

  According to this sieving device, since the angle of the slope of the guide member is set to 40 degrees or less with respect to the horizontal, in order to prevent foreign matter from rolling on the slope, the foreign matter is along the slope. It slides down in an inclined state and reaches the sieve section. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  Moreover, the sieving apparatus of the present invention is characterized in that, in the second invention, the guide member is subjected to a treatment for reducing frictional resistance on the surface of the inclined surface.

  According to this sieving device, the surface of the inclined surface of the guide member has been subjected to a process for reducing frictional resistance, so that the foreign material is prevented from rolling along the inclined surface. It slides down in an inclined state and reaches the sieve section. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  In the sieving device according to the second aspect of the present invention, in the second invention, the guide member has a vertical distance between the lower end of the inclined surface and the sieving portion that is less than or equal to the length of a contaminant that can be included in the sieving object. It is characterized by being set to.

  According to this sieving device, the vertical distance between the lower end of the slope and the screen portion of the guide member is set to be equal to or less than the length of the foreign matter, so that the foreign matter sliding down the slope falls from the lower end of the slope. When it does, it becomes easy to reach a sieve part with the state inclined along the slope. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  Further, the sieving apparatus of the present invention is the sieving device according to the second invention, further comprising a moving mechanism that moves the sieving portion in a horizontal direction in accordance with the inclination direction of the inclined surface of the guide member, and the angle of the inclined surface of the guide member The relationship between θ, the average speed Vb of the sieve object sliding down the slope of the guide member, and the moving speed Vr of the sieve portion by the moving mechanism is Vb · cos θ ≦ Vr. .

  According to this sieving device, since the moving speed of the sieving part is faster than the average speed of the object to be slid down the slope of the guide member, when the foreign matter sliding down the slope falls from the lower end of the slope, It becomes easy to reach a sieve part with the state inclined along. For this reason, it suppresses that a long contaminant stands along an up-down direction on a sieve part. As a result, it is possible to prevent the passage of impurities longer than the setting.

  According to the present invention, it is possible to prevent the passage of impurities longer than the setting.

FIG. 1 is a schematic configuration diagram of a gasification system to which a sieving apparatus according to an embodiment of the present invention is applied. FIG. 2 is a schematic perspective view of the sieving device according to Embodiment 1 of the present invention. FIG. 3 is a schematic sectional side view of the sieving device according to the first embodiment of the present invention. FIG. 4 is a schematic sectional side view of another example of the sieving device according to Embodiment 1 of the present invention. FIG. 5 is a schematic cross-sectional side view of a sieving apparatus according to Embodiment 2 of the present invention. FIG. 6 is a schematic plan view of a sieving device according to Embodiment 2 of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram of a gasification system to which a sieving device according to this embodiment is applied.

  The gasification system 50 produces | generates a fuel from biomass as shown in FIG. In this gasification system 50, the biomass is dried by a drying device 51 and stored in a hopper 52, the biomass is quantitatively supplied to the pulverizer 53 by the hopper 52, and the biomass pulverized by the pulverizer 53 is sieved by the sieving device 54. The selected biomass is weighed by the weighing device 55 and burned by the gas furnace 56 to be gasified as combustion gas. Thereafter, the combustion gas is used, for example, for producing methanol or for generating steam for driving a steam turbine for power generation.

  The sieving device 54 applied to such a gasification system 50 stabilizes the combustion in the gas furnace 56 by selecting and removing foreign substances from the sieved material as biomass pulverized by the pulverizing device 53. This is applied to stabilizing the supply to the gas furnace 56. Here, in this embodiment, the biomass to be applied in particular is wood (thinned wood, waste wood, driftwood, etc.) that can be in a long form even when pulverized by the pulverizer 53. Accordingly, in the present embodiment, the sieving device 54 is for selecting and removing the long contaminants when the contaminants longer than expected are mixed in the biomass to be sieved. is there.

[Embodiment 1]
FIG. 2 is a schematic perspective view of the sieving device according to the present embodiment. FIG. 3 is a schematic sectional side view of the sieving apparatus according to the present embodiment. FIG. 4 is a schematic sectional side view of another example of the sieving device according to the present embodiment.

  The sieving device 54 according to the present embodiment includes a sieving unit 1 and a guide member 2.

  The sieve portion 1 and the guide member 2 are provided in the casing 3. The casing 3 includes a cylindrical body portion 3A that is open at the top, and a bottom plate 3B that closes the bottom of the body portion 3A. In FIG. 1, the casing 3 is simplified by ignoring the thicknesses of the body 3A and the bottom plate 3B, and shown through the inside.

  The sieving part 1 is attached to the casing 3 in the middle of the body part 3A in the vertical direction. The sieve portion 1 is formed in a circular shape so as to divide the inner region of the body portion 3A into upper and lower regions 3α and 3β, and has a sieve mesh 1A. The sieve mesh 1A includes a large number of through holes, and is configured as, for example, a mesh. The sieve mesh 1A allows the essential material S1 having a predetermined particle size to pass through the lower region 3β of the trunk portion 3A out of the article S to be sieved introduced from the upper opening portion of the trunk portion 3A of the casing 3, while The foreign matter S2 that is longer or larger than the particle size of the material is left in the upper region 3α of the trunk portion 3A without passing therethrough. The casing 3 is formed with a foreign matter discharge hole 3 </ b> C that penetrates the trunk portion 3 </ b> A at the same height position as the upper surface of the sieve portion 1 (bottom position of the upper region 3α). The foreign matter S2 that does not pass through the sieve 1A of the sieve portion 1 and remains in the upper region 3α is discharged to the outside of the casing 3 through the foreign matter discharge hole 3C. In addition, the casing 3 is formed with a necessities discharge hole 3D that penetrates the trunk portion 3A at the same height position as the upper surface of the bottom plate 3B (the bottom position of the lower region 3β). The necessities S1 that pass through the mesh 1A of the sieving part 1 and reach the lower region 3β are discharged out of the casing 3 through the necessities discharge hole 3D. In the present embodiment, the sieve portion 1 is disposed horizontally with respect to the casing 3.

  The guide member 2 is disposed above the sieve portion 1 in the upper region 3α of the casing 3A of the casing 3A. The guide member 2 has a bottom surface 2A that faces the sieve portion 1 in the up-down direction. In the guide member 2, the distance D between the bottom surface 2 </ b> A and the sieve portion 1 is set to be equal to or less than the length L of the contaminant S <b> 2 that can be included in the sieved object S. Here, the length L of the foreign matter S2 means a length that is not suitable for stable combustion in the subsequent gas furnace 56 or a length that may be clogged in a pipe that is transported to the subsequent gas furnace 56. In the present embodiment, the guide member 2 is formed in a plate shape and is disposed horizontally with respect to the casing 3 in the same manner as the sieve portion 1.

  Further, the guide member 2 is provided with an opening 2B. The opening 2 </ b> B is a part for dropping the object S to be sieved from the open part at the top of the trunk 3 </ b> A of the casing 3 onto the sieve 1. In the present embodiment, the opening 2B is provided so as to penetrate through the center of the guide member 2 arranged so as to divide the upper region 3α of the trunk 3A vertically. Although not shown in the drawing, the opening 2B may be formed as a gap between the guide members 2 divided into a plurality.

  Note that the sieving device 54 of the present embodiment includes a moving mechanism 4 that moves the sieving portion 1 and the guide member 2 eccentrically with respect to an axis extending in the vertical direction.

  For example, as shown in FIGS. 3 and 4, the moving mechanism 4 is provided with a pivot shaft 4A extending in the vertical direction on the bottom plate 3B of the casing 3, and the pivot shaft 4A extends in the vertical direction via the crank 4B. It is connected to the existing rotating shaft 4C. The rotation shaft 4C is provided so as to be rotatable about an axial center AC extending in the vertical direction, and is connected to a rotation drive source 4D such as a motor. The rotation drive source 4D is directly connected to the rotation shaft 4C in FIGS. 3 and 4, but may be connected to the rotation shaft 4C via a reduction gear (not shown). As the rotation shaft 4C is rotated by the rotation drive source 4D, the turning shaft 4A moves eccentrically with respect to the shaft center AC by the crank 4B, so that the casing 3 moves eccentrically together with the turning shaft 4A.

  Accordingly, in the sieving device 54, since the sieving part 1 and the guide member 2 are rotated in the horizontal direction by the moving mechanism 4, the necessities S1 in the sieving object S pass through the sieving 1A of the sieving part 1, while The foreign matter S2 in the sieve S is left on the sieve 1 and sorted.

  As described above, the sieving device 54 of the present embodiment includes the sieving portion 1 formed with the predetermined sieving mesh 1A, and the bottom surface disposed above the sieving portion 1 and facing the sieving portion 1 in the vertical direction. A guide member 2 having 2A and a distance D between the bottom surface 2A and the sieving portion 1 is set to be equal to or less than the length L of the foreign matter S2 that can be included in the sieving object S.

  Normally, the contaminant S2 does not pass through the sieve 1A of the sieve part 1, but may pass through the sieve 1A of the sieve part 1 when standing along the vertical direction. Therefore, according to the sieving device 54 of the present embodiment, the vertical distance D between the bottom surface 2A of the guide member 2 and the sieving portion 1 is set to be equal to or less than the length L of the foreign matter S2, so that the foreign matter S2 is restrained from standing along the vertical direction on the sieve portion 1. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  Moreover, in the sieving apparatus 54 of this embodiment, the guide member 2 is provided so that the space | interval D of the bottom face 2A and the sieve part 1 can be adjusted.

  For example, as shown in FIG. 3, the guide member 2 is supported by a support piece 2 </ b> C that protrudes to the inside of the trunk portion 3 </ b> A with respect to the trunk portion 3 </ b> A of the casing 3. As shown in FIG. 2, when the guide member 2 is formed in a disc shape along the inner surface of the trunk portion 3A, the support piece 2C is provided in a ring shape along the circumferential direction of the inner surface of the trunk portion 3A. Or provided at a plurality of locations along the circumferential direction of the inner surface of the body portion 3A. And since the vertical position which supports the guide member 2 changes by changing the position of the support piece 2C with respect to the trunk | drum 3A up and down, the guide member 2 is provided so that the space | interval D of the bottom face 2A and the sieve part 1 can be adjusted. It is done. In addition, although not explicitly shown in the drawing, a support portion for supporting the guide member 2 is provided so as to be movable by a vertically extending slit formed in the body portion 3A, and the support portion is provided at an arbitrary position of the slit. You may comprise so that the up-and-down position which supports the guide member 2 may be changed by fixing.

  According to the sieving device 54, the guide member 2 is provided so that the distance D between the bottom surface 2A and the sieve portion 1 can be adjusted, so that the guide member 2 can be adjusted according to the length L of various contaminants S2. It can have versatility by adjusting the distance D between the bottom surface 2A and the sieve portion 1.

  Moreover, in the sieving device 54 of the present embodiment, as shown in FIG. 4, the guide member 2 is provided with an opening 2 </ b> B for dropping the object to be sieved S with respect to the sieving part 1. A closed portion 1B which is closed without having the mesh 1A is provided at a position directly below the portion 2B.

  When the foreign matter S2 is contained in the to-be-sieved object S falling to the sieve part 1 through the opening part 2B of the guide member 2, there exists a possibility that the foreign substance S2 may fall in the up-down direction. According to the sieving device 54, since the closing portion 1B is provided at a position directly below the opening 2B of the sieving portion 1, even if the foreign matter S2 stands and falls from the opening 2B, the blocking portion 1B is hit. Since it contacts, long passage S2 can be prevented from passing.

[Embodiment 2]
FIG. 5 is a schematic sectional side view of the sieving apparatus according to the present embodiment. FIG. 6 is a schematic plan view of the sieving device according to the present embodiment.

  The sieving device 54 according to the present embodiment includes a sieving part 11 and a guide member 12.

  The sieve part 11 is provided in the casing 13. The casing 13 includes a cylindrical body portion 13A that opens upward and a bottom plate 13B that closes the bottom of the body portion 13A.

  The sieve portion 11 is attached to the casing 13 in the middle of the trunk portion 13A in the vertical direction. The sieve portion 11 is formed in a circular shape and is provided so as to divide the inner region of the body portion 13A into upper and lower regions 13α and 13β, and has a sieve mesh 11A. 11 A of sieve meshes consist of many through-holes, for example, are comprised as a mesh. The sieve mesh 11A allows the essential material S1 having a predetermined particle diameter to pass through the lower region 13β of the trunk portion 13A among the articles S to be sieved introduced from the open portion of the upper portion of the trunk portion 13A of the casing 13 while being predetermined. The foreign matter S2 that is longer or larger than the particle size of the material is left in the upper region 13α of the trunk portion 13A without passing therethrough. The casing 13 has a dust discharge hole 13 </ b> C penetrating through the body portion 13 </ b> A at the same height position as the upper surface of the sieve portion 11 (bottom position of the upper region 13α). The foreign matter S2 that does not pass through the sieve 11A of the sieve portion 11 and remains in the upper region 13α is discharged to the outside of the casing 13 through the foreign matter discharge hole 13C. Further, the casing 13 is formed with a necessity discharge hole 13D penetrating through the trunk portion 13A at the same height position as the upper surface of the bottom plate 13B (bottom position of the lower region 13β). The necessities S1 that pass through the sieve 11A of the sieving part 11 and reach the lower region 13β are discharged to the outside of the casing 13 through the necessities discharge hole 13D. In the present embodiment, the sieve part 11 is arranged horizontally with respect to the casing 13.

  The guide member 12 is disposed above the sieve portion 11 in the upper region 13α of the trunk portion 13A in the casing 13. The guide member 12 has a slope 12 </ b> A that slopes toward the sieve portion 11. In this embodiment, the guide member 12 is formed in a plate shape, and is supported by a portion (not shown) independently of the sieve portion 11 and the casing 13.

  Accordingly, in the sieving device 54, the material to be sieved S slides down the inclined surface 12A of the guide member 12 to the sieve part 11, and the necessities S1 passes through the sieve 11A of the sieve part 11, while the foreign matter S2 is sieved. It is left in the section 11 and sorted.

  Further, the sieving device 54 of the present embodiment includes a moving mechanism 14 that moves the sieving portion 11 in the horizontal direction in accordance with the inclination direction of the inclined surface 12A of the guide member 12.

  For example, as shown in FIG. 5, the moving mechanism 14 is provided with a rotating shaft 14 </ b> A that extends in the vertical direction at the center of the bottom plate 13 </ b> B of the casing 13. The rotary shaft 14A is provided so as to be rotatable about an axial center AC extending in the vertical direction, and is connected to a rotary drive source 14B such as a motor. The rotation drive source 14B is directly connected to the rotation shaft 14A in FIG. 5, but may be connected to the rotation shaft 14A via a reduction gear (not shown). The casing 13 rotates together with the sieve portion 11 around the axis AC as the rotating shaft 14A rotates by being connected to the rotation drive source 14B. In the guide member 12, the inclination direction of the inclined surface 12 </ b> A matches the rotation direction of the sieve portion 11. Accordingly, the sieve portion 11 moves in the horizontal direction in accordance with the inclination direction of the inclined surface 12A of the guide member 12.

  Therefore, in the sieving device 54, the essentials S <b> 1 passes through the mesh 11 </ b> A of the sieving part 11 even when the sieving part 11 moves in the horizontal direction according to the inclination direction of the inclined surface 12 </ b> A of the guide member 12 by the moving mechanism 14. On the other hand, the foreign matter S2 is left on the sieve portion 11 and sorted.

  As described above, the sieving device 54 of the present embodiment has the sieve portion 11 formed with the predetermined sieve mesh 11 </ b> A, and the inclined surface 12 </ b> A in such a manner that the object to be sieved S slides down with respect to the sieve portion 11. And a guide member 12.

  Normally, the contaminant S2 does not pass through the sieve 11A of the sieve part 11, but may pass through the sieve 11A of the sieve part 11 when standing along the vertical direction. Therefore, according to the sieving device 54 of the present embodiment, when the object to be sieved S includes the long foreign matter S2, the foreign matter S2 sliding down the slope 12A of the guide member 12 is along the slope 12A. And reaches the sieve section 11 in an inclined state. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  Further, in the sieving device 54 of the present embodiment, the guide member 12 is preferably set so that the angle θ of the inclined surface 12A is equal to or less than the repose angle of the foreign matter S2 that can be included in the sieved object S.

  According to the sieving device 54, since the angle θ of the inclined surface 12A of the guide member 12 is set to be equal to or less than the repose angle of the contaminant S2, it is possible to prevent the contaminant S2 from rolling on the inclined surface 12A. The object S2 slides down in the state inclined along the inclined surface 12A and reaches the sieve part 11. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  In the sieving device 54 of the present embodiment, the guide member 12 is preferably set so that the angle θ of the inclined surface 12A is 40 degrees or less with respect to the horizontal.

  According to the sieving device 54, since the angle θ of the inclined surface 12A of the guide member 12 is set to 40 degrees or less with respect to the horizontal, it is possible to prevent the foreign matter S2 from rolling on the inclined surface 12A. The object S2 slides down in the state inclined along the inclined surface 12A and reaches the sieve part 11. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  Moreover, in the sieving apparatus 54 of this embodiment, it is preferable that the guide member 12 is subjected to a process for reducing frictional resistance on the surface of the inclined surface 12A. Examples of the process for reducing the frictional resistance include fluorine coating and mirror surface treatment.

  According to the sieving device 54, the surface of the inclined surface 12A of the guide member 12 is subjected to the process of reducing the frictional resistance, thereby preventing the foreign matter S2 from rolling on the inclined surface 12A. Slid down in a state of being inclined along the inclined surface 12 </ b> A and reach the sieve portion 11. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  In the sieving device 54 of the present embodiment, the guide member 12 has a vertical distance D between the lower end 12B of the inclined surface 12A and the sieving portion 11 that is equal to or less than the length L of the foreign matter S2 that can be included in the sieving object S. It is preferable to set to.

  Here, the length L of the foreign matter S2 means a length that is not suitable for stable combustion in the subsequent gas furnace 56 or a length that may be clogged in a pipe that is transported to the subsequent gas furnace 56.

  According to the sieving device 54, the vertical distance D between the lower end 12B of the inclined surface 12A and the sieve portion 11 of the guide member 12 is set to be equal to or less than the length L of the contaminant S2, thereby sliding down the inclined surface 12A. When the foreign matter S2 falls from the lower end 12B of the slope 12A, it becomes easy to reach the sieve portion 11 while being inclined along the slope 12A. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

  Further, the sieving device 54 of the present embodiment includes a moving mechanism 14 that moves the sieving portion 11 in the horizontal direction in accordance with the inclination direction of the inclined surface 12A of the guide member 12, and the angle θ of the inclined surface 12A of the guide member 12; It is preferable that the relationship between the average speed Vb of the object to be sieved S sliding down the inclined surface 12A of the guide member 12 and the moving speed Vr of the sieve part 11 by the moving mechanism 14 is Vb · cos θ ≦ Vr.

  According to the sieving device 54, since the moving speed Vr of the sieving portion 11 is faster than the average speed Vb of the object S to be slid down the slope 12A of the guide member 12, the contaminant S2 that slid down the slope 12A is When falling from the lower end 12B of 12A, it becomes easy to reach the sieving portion 11 while being inclined along the inclined surface 12A. For this reason, it is suppressed that the long foreign substance S2 stands along the up-down direction on the sieve part 11. FIG. As a result, it is possible to prevent the passage of the foreign matter S2 longer than the setting.

DESCRIPTION OF SYMBOLS 1 Sieve part 1A Sieve 1B Closed part 2 Guide member 2A Bottom face 2B Opening part 11 Sieve part 11A Sieve 12 Guide member 12A Slope 12B Lower end 14 Moving mechanism D Interval S Sieve object S1 Necessary thing S2 Contaminant

Claims (9)

A sieve portion formed with a predetermined sieve mesh;
The bottom surface disposed above the sieving portion and facing the sieving portion in the up-down direction is set to be equal to or less than the length of the contaminants that can be included in the sieving object. A guide member,
A sieving apparatus comprising:   The sieving device according to claim 1, wherein the guide member is provided so that an interval between the bottom surface and the sieving portion can be adjusted. The guide member is provided with an opening for dropping the object to be sieved with respect to the sieve part,
The sieving device according to claim 1 or 2, wherein the sieving portion is provided with a closed portion that is closed without having the sieving mesh at a position directly below the opening. A sieve portion formed with a predetermined sieve mesh;
A guide member having a slope in a mode of sliding the object to be sieved against the sieve part,
A sieving apparatus comprising:   The sieving apparatus according to claim 4, wherein the guide member is set to have an angle of repose in an assumed contaminant that can be included in the sieved object.   The sieving apparatus according to claim 4, wherein the guide member has an angle of the slope set to 40 degrees or less with respect to the horizontal.   The sieving device according to any one of claims 4 to 6, wherein the guide member is subjected to a treatment for reducing frictional resistance on a surface of the slope. 8. The guide member according to claim 4, wherein an interval in a vertical direction between the lower end of the slope and the sieve portion is set to be equal to or less than a length of a foreign substance that can be included in the sieve object. The sieving apparatus according to claim 1. A moving mechanism for moving the sieve portion in a horizontal direction in accordance with the inclination direction of the inclined surface of the guide member;
The relationship between the angle θ of the inclined surface of the guide member, the average speed Vb of the sieve object sliding down the inclined surface of the guide member, and the moving speed Vr of the sieve portion by the moving mechanism is expressed as Vb · cos θ ≦ It is set as Vr, The sieving apparatus as described in any one of Claims 4-8 characterized by the above-mentioned.

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