JP2007130515A - Sieving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sieving device having an excellent process efficiency, which is surely prevented from being clogged with an object matter such as powder with a simple construction without producing any noise or the like. <P>SOLUTION: The device is provided with a pair of movable end plates 4 provided on the device body 1 rotatably about its axis, wherein a plurality of slot holes 8 positioning a longitudinal direction in a radial direction are radially formed on the outer periphery at even intervals in a circumferential direction, a plurality of sticks 5 passing through among the slotted holes 8 of the movable end plates 4 to bridge, a pair of fixed members 2 which are fixed on the device body 1 along an outer surface of the movable end plate 4, and in which an end of the stick 5 is inserted into the outer periphery of a counter surface of the movable end plate 4 in communication with the slot hole 8, and at the same time, an annular guide groove 9 wherein the radius of curvature to a rotation center increases in an upper portion as compared with a lower portion is formed, and a driving means 7 rotating the movable end plate 4 and the stick 5 in the axial line direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sieving device used for selectively separating fine particles having a predetermined particle size or less from an object to be processed such as powder and granules.

  As is well known, in various production and manufacturing processes that handle powders or granules as raw materials such as cement and minerals, raw materials such as chemicals and pharmaceuticals, or food ingredients such as cereals, In order to adjust the particle size (size) within a certain range or to remove foreign substances contained in the powder or the like, sieving apparatuses having various structures are used.

  As such a sieving device, in general, the object to be treated such as the above powder is supplied between a wire mesh having a predetermined mesh or a sieve rod disposed with a predetermined gap, thereby making the mesh of the wire mesh. There is known a method in which a powder or the like smaller than the gap between the sieving bars is separated by passing between the wire mesh and the sieving bars.

By the way, in the conventional sieving apparatus using the above-mentioned wire mesh and sieving bar, in the process of using, the result of gradually clogging powder etc. in the hole of the above-mentioned wire mesh and between the sieving bars There is a drawback in that the sieving performance of the powder or the like having a certain size or less is drastically lowered.
For this reason, in order to eliminate the clogging, after a sieving operation for a certain period of time has elapsed, the operation must be stopped once and the clogging must be eliminated by cleaning or the like. There was a problem.

Therefore, a rotary shifter device as shown in Patent Document 1 has been proposed as a type of sieving device that can solve such problems.
In this rotary shifter device, a shifter having a hollow cylindrical shape whose outer wall is formed of a metal mesh is rotatable and swingable by a drive mechanism, and at least one of the drive mechanism and the motor can be rotated by the motor. The drive shafts are arranged in parallel with each other at a distance slightly narrower than the diameter of the shifter, and the shifter is placed on these drive shafts and driven by the motor. While the shifter is rotated by the rotational movement of the shaft, the shifter is pushed upward and rocked at a constant cycle by a swing mechanism such as a cam that rotates by the rotational motion of the drive shaft in parallel with the rotation of the shifter. Is.

According to the rotary shifter device having the above configuration, the hollow cylindrical shifter whose peripheral wall is configured by a metal mesh is rotated by the swing mechanism in parallel with the rotation by the drive mechanism. For example, when sieving flakes obtained by pulverizing used agricultural film, fine foreign substances can be easily and reliably separated and removed from the flakes. Has been.
JP 2001-205196 A

  However, according to the conventional rotary shifter device, although the clogging mechanism can be expected to remove a constant clogging, the swinging mechanism pushes the shifter upward at a constant period to swing. For this reason, there is a drawback that it is difficult to remove even the powder that has been pressed into the wire net by its own weight when a large amount of the object to be treated such as powder is charged.

  In addition, when the shifter is swung up and swung at a constant period, a large noise is generated, and the shifter is damaged by the swinging, so that reinforcement or the like is necessary, and thus the entire apparatus becomes heavy. There was also a problem.

  The present invention has been made in view of the above circumstances, and is a sieve that is excellent in processing efficiency because it can reliably prevent clogging of an object to be processed such as powder without causing noise and the like and with a simple structure. It is an object to provide a dividing device.

  In order to solve the above-mentioned problem, the invention according to claim 1 is arranged on the apparatus main body with the opposing surfaces spaced apart from each other in the horizontal direction and rotated about an axis connecting the center portions of the opposing surfaces. A pair of movable end face plates that are freely provided and a plurality of long holes whose outer circumferential portions are positioned in the longitudinal direction in the radial direction of the rotating arc are radially formed at equal intervals in the circumferential direction of the rotating arc. And between the movable end face plates are inserted between the elongated holes of the movable end face plates, thereby forming a drum portion to which an object to be processed such as powder is supplied together with the movable end face plates. A plurality of rod-like members and an outer surface of the movable end face plate are fixed to the apparatus main body, and an end portion of the rod-like member communicates with the elongated hole on an outer peripheral portion of a surface facing the movable end face plate. And the radius of curvature relative to the center of rotation is A pair of fixing members guiding the annular groove is formed with its upper part is larger than part, the drum unit is characterized in that and a drive means for rotating around the axis.

  Here, the invention according to claim 2 is characterized in that the guide groove of the fixing member according to claim 1 is formed in a circular shape with its center positioned above the axis. On the other hand, the invention according to claim 3 is characterized in that the guide groove of the fixing member according to claim 1 is formed in a semicircular shape having a constant radius centered on the axis below the axis. The upper part is formed in a curved shape having a larger radius of curvature than the semicircular shape.

  According to the sieving device according to any one of claims 1 to 3, the bar-like member spanned between the movable end face plates constituting the drum portion is inserted into a long hole formed radially on the movable end face plate. Therefore, each rod-shaped member is provided so as to be movable in the radial direction of the rotating arc along the elongated hole. Further, each rod-like member is inserted into an annular guide groove of a fixed member whose end is disposed along the movable end face plate. And this cyclic | annular guide groove is formed so that the curvature radius with respect to the said rotation center may become larger than the lower part.

  For this reason, when the drum portion is rotationally driven by the driving means, the rod-shaped member is guided by the guide groove as it rotates from the lower part to the upper part, and gradually moves in the radially outward direction in the elongated hole of the movable end face plate. Move to. As a result, the interval between the rod-shaped members when reaching the upper portion is wider than the interval at the lower portion.

  Therefore, when the object to be processed such as powder or granular material is put into the drum part by the driving means and the drum part is rotated around its axis, the object to be processed is first formed at the bottom of the drum part. Of these, particles having a particle size (size) smaller than the interval between the rod-shaped members adjacent to each other in the circumferential direction pass between the rod-shaped members and are discharged to the outside from the drum portion, thereby performing desired sieving. it can.

  At this time, powder or the like that is slightly larger than the interval between the rod-like members may enter between the rod-like members at the bottom of the drum portion, resulting in clogging. Since the interval between the rod-like members is wider than the interval at the lower part, the clogging can be eliminated by the powder or the like causing the clogging naturally dropping downward.

  As a result, according to the sieving device of the present invention, it is possible to reliably prevent clogging of an object to be processed such as powder by a simple structure without causing noise or the like as in the conventional rotary shifter device described above. Therefore, high sieving efficiency can be maintained over a long period of time.

  In addition, as long as the said guide groove is formed so that the curvature radius with respect to the said rotation center may become larger than the lower part, various shapes can be employ | adopted, For example, Claim 2 If the guide groove is formed in a circular shape with the center positioned above the rotation center as in the invention, the curvature radius of the guide groove with respect to the rotation center is necessarily larger at the upper part than at the lower part. Therefore, the guide groove for the fixing member can be easily processed.

  On the other hand, as in the invention according to claim 3, the guide groove is formed in a semicircular shape with a constant radius centered on the axis below the axis, and above the axis is the above If it is formed in a curved shape having a radius of curvature larger than that of a semicircular shape, even when sieving is performed between rod-like members below the side portions by putting a large amount of powder and other objects to be processed into the drum portion. Since the interval between the rod-like members is equal below the axis, sieving with a uniform particle size can be performed.

1 to 4 show an embodiment of a sieving apparatus according to the present invention, and reference numeral 1 in the figure denotes an apparatus main body installed on a floor surface.
Supporting columns 1a and 1b are erected on both sides of the apparatus main body 1, and a pair of flat plate-shaped fixing plates (fixing members) 2 are integrally erected on the inner sides of the supporting columns 1a and 1b. ing. Here, the fixed plates 2 are arranged in the horizontal direction so that the opposing surfaces 2 a are parallel to each other, and the drum portion 3 is rotatably provided between the fixed plates 2.

The drum portion 3 includes a pair of disc-shaped movable end face plates 4 disposed along the opposing surface 2 a of the fixed plate 2, and a cylindrical bar-like sieving bar (bar-like shape) bridged between the movable end face plates 4. Member) 5 and is generally a bowl-shaped member.
Then, at the center of the outer surface of the movable end face plate 4, shaft portions 6a and 6b projecting in the horizontal direction and penetrating the fixed plate 2 are integrally provided, and one shaft portion 6a is rotatably supported by the support column 1b. Yes. The other shaft portion 6b is rotatably supported by the support column 1b, and is connected to a motor (driving means) 7 for rotationally driving the drum unit 3 installed on the support column 1b.

Thereby, the drum part 3 is provided between the support pillars 1a and 1b of the apparatus main body 1 so as to be rotatable around the axis of the shaft parts 6a and 6b by the motor 7.
Further, a plurality of long holes 8 whose longitudinal directions are positioned in the radial direction of the shaft portions 6 a and 6 b are radially arranged at equal intervals in the circumferential direction of the movable end plate 4 at the outer peripheral portion of the movable end plate 4. Is formed. The long hole 8 is formed so that its width in the short direction is slightly larger than its diameter so that the sieve bar 5 can be inserted. Each sieve bar 5 is provided so as to be movable in the longitudinal direction of the elongated hole 8 with both ends thereof being inserted into the elongated holes 8 of the opposed movable end face plate 4 and partially projecting at both ends. Yes.

On the other hand, a circular guide groove 9 is formed on the end surface of the fixed plate 2 facing the outer surface of the movable end surface plate 4. The guide groove 9 communicates with the long hole 8 formed in the movable end face plate 4 over the entire circumference, and the center C ₁ of the guide groove 9 is the center C ₂ of the shaft portions 6 a and 6 b that serve as the rotation center of the drum portion 3. It is formed in a circular shape that is positioned above.
Thereby, the guide groove 9 is arranged so as to communicate with the outer peripheral side of the long hole 8 in the upper part of the fixing plate 2 and to communicate with the inner peripheral side of the long hole 8 in the lower part of the fixing plate 2.

  A bearing 10 is mounted on the outer periphery of both ends of the sieving bar 5, and the bearing 10 is inserted into the guide groove 9. Thus, the sieve bar 5 is guided in the circumferential direction along the guide groove 9 when the movable end face plate 4 is rotated with respect to the fixed plate 2, and the inner peripheral side and the outer peripheral side in the long hole 8. It is arrange | positioned so that it can move between.

Here, the dimensions between the adjacent elongated holes 8, the outer diameter of the guide groove 9, the amount of eccentricity between the center C ₁ and the center of rotation C ₂ of the guide groove 9, and the like are as follows. Is set so that the gap between the adjacent sieving bars 5 becomes the particle size (size) of the object to be treated such as powder to be sieved.
Reference numerals 11 and 12 in the drawing are openings formed in the fixed plate 2 and the movable end face plate 4, respectively, for introducing an object to be processed such as powder into the drum portion 3.

  According to the sieving apparatus having the above-described configuration, the processing object such as powder or granular material to be sieved is introduced into the drum portion 3 from the openings 11 and 12, and the shaft portions 6 a and 6 b are driven by the motor 7. Is rotated, thereby rotating the drum portion 3 around its axis. Then, in the bottom part of the drum part 3, the thing of a particle size (size) smaller than the space | interval of the sieve bar 5 adjacent to the circumferential direction among the said to-be-processed objects passes between these sieve bars 5, and a dotted-line arrow in a figure As shown by, the desired sieving can be performed by discharging downward from the drum portion 3.

At this time, as shown in FIG. 3, when the powder A or the like slightly larger than the interval δ of the sieving bars 5 enters between the sieving bars 5 and clogs at the bottom of the drum part 3, As the drum portion 3 rotates upward, the sieving bar 5 is guided along the guide groove 9 of the fixed plate 2 having the center C ₁ above the rotation center C ₂ , and gradually the outer peripheral side of the elongated hole 8. Move to.

  In the upper part, the interval Δ of the sieving bar 5 is larger than the interval δ in the lower part (Δ> δ). As a result, the powder A or the like that has clogged between the sieving bars 5 naturally falls downward, so that the clogging can be eliminated only by the rotation of the drum portion 3.

  Therefore, according to the sieving device, it is possible to reliably prevent clogging of the powder A and the like with a simple structure without causing noise or the like as in the conventional rotary shifter device, and thus over a long period of time. High sieving efficiency can be maintained.

In the above-described embodiment, the guide groove 9 is formed in a circular shape, and the center C ₁ thereof is positioned above the rotation center C ₂ of the drum portion 3, thereby reducing the curvature radius of the guide groove 9. However, the present invention is not limited to this. For example, the guide groove is a half of a constant radius with the center C ₂ below the rotation center C _2. and a circular, upward than the center of rotation C ₂ may also form a radius of curvature larger curved than the semi-circular.

By the way, if such a guide groove is formed, a large amount of powder or the like to be processed is put into the drum part 3 so that not only at the bottom part of the drum part 3 but also between the sieving bars 5 below the side parts. Even when sieving is performed, since the intervals of the sieving bars 5 are equal below the rotation center C _2, it is possible to perform sieving with a uniform particle size.

It is a longitudinal section showing one embodiment of a sieving device concerning the present invention. It is a side view which shows the positional relationship of the long hole of FIG. 1, and a guide groove. It is a side view which expands and shows only the upper and lower parts of FIG. It is an enlarged view which shows the edge part of the sieving stick | rod of FIG.

Explanation of symbols

1 Device body 2 Fixing plate (fixing member)
3 Drum part 4 Movable end face plate 5 Sieve bar (bar-shaped member)
7 Motor (drive means)
8 Long hole 9 Guide groove

Claims (3)

The device main body is disposed with its opposing surfaces spaced apart from each other in the horizontal direction, and is provided to be rotatable about an axis connecting the central portions of the opposing surfaces, and is extended in the radial direction of the rotating arc on the outer peripheral portion. A pair of movable end face plates in which a plurality of elongated holes whose directions are positioned are radially formed at equal intervals in the circumferential direction of the rotating arc;
A plurality of drums that are inserted between the elongated holes of the movable end face plates and are bridged between the movable end face plates to form a drum portion to which an object to be processed such as powder is supplied together with the movable end face plates. A rod-shaped member of
The end of the rod-shaped member is inserted into the outer peripheral portion of the surface facing the movable end plate along the outer surface of the movable end plate, and communicates with the elongated hole. A pair of fixing members formed with an annular guide groove having a radius of curvature with respect to the center that is larger at the top than at the bottom;
Driving means for rotating the drum portion around the axis;
A sieving device comprising:   The sieving device according to claim 1, wherein the guide groove of the fixing member is formed in a circular shape with its center positioned above the axis.   The guide groove of the fixing member is formed in a semicircular shape with a constant radius centered on the axis below the axis, and has a curved shape with a larger radius of curvature than the semicircle above the axis. The sieving device according to claim 1, wherein the sieving device is formed.

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