JP3200294U - Screen type classifier - Google Patents

Abstract

A dry tilt type screen classifier capable of maintaining high classification efficiency without causing breakage of the screen is provided. A screen classifier 1 is a dry classifier, and includes a casing 2, a cylindrical screen 3 formed of a synthetic fiber woven net, and a rotary blade 5 provided with blades 4. A raw material supply case 6 is attached to one end of the casing 2, and a sieve product case 7 is attached to the other end. A fine powder outlet chute 8 is provided at the lower part of the casing 2. The casing 2 and the cylindrical screen 3 are disposed in an inclined state of 3 to 10 ° with respect to the horizontal direction with the raw material supply side facing down. Compared with the case where the cylindrical screen 3 is arranged horizontally, the time during which the powdery raw material 31 stays in the cylindrical screen 3 becomes longer, the chance that the powdery raw material 31 is sieved by the cylindrical screen 3 is increased, and the sieving efficiency is increased. This improves the yield. [Selection] Figure 1

Description

  The present invention relates to a screen type classifier that sifts powdery raw materials, and more particularly, to a dry type screen classifier in which cylindrical screens are inclined.

  Conventionally, inorganic chemicals such as nickel powder, alumina nitride, and silica, organic compounds such as thermoplastic resins and thermosetting resins, cosmetics such as pharmaceuticals, foods, and foundations, toners for electrostatic image phenomena (polymerization method) Cylinders using synthetic fiber woven mesh as a device for sieving powdered raw materials such as powder coatings, etc., including toner prepared and pulverized, spray dried, agglomerated, dissolved and dispersed, etc. A screen classifier is used. In such a cylindrical screen classifier, the powdery raw material charged into the cylindrical screen is dispersed and swirled by the rotor blades (rotor blades), and the finer powder than the screen openings passes through the mesh and passes through the fine powder outlet. The coarse powder is discharged from the edge of the screen.

JP 2004-267909 A Japanese Patent No. 4909300

  However, in a device in which a cylindrical screen is horizontally arranged as in the classifier of Patent Document 1, the powdery raw material accelerated by the blade rotating at high speed may reach the end of the screen before classification. There was a problem that the product yield decreased. In this regard, in the apparatus of Patent Document 2, as the cylindrical screen is inclined, it takes time until the powdery raw material reaches the end of the screen, and the classification yield is improved. However, since the apparatus of Patent Document 2 is a wet apparatus for slurry raw materials, the inclination angle of the cylindrical screen is set large. For this reason, if the apparatus of patent document 2 is used for a dry classification process, a powdery raw material will not only stay down and classification will be performed, but the synthetic resin screen will be damaged by the retained raw material. There was a problem.

  An object of the present invention is to provide a dry inclined screen classifier capable of maintaining high classification efficiency without causing screen breakage.

  A screen type classifier of the present invention includes a cylindrical screen formed of a synthetic fiber woven net, a rotary blade that is disposed in the cylindrical screen, and disperses and swirls the powdery raw material supplied into the cylindrical screen; A dry screen type classifier that screens the powdery raw material finer than the opening of the cylindrical screen out of the cylindrical screen by rotating the rotary blade, Is arranged in an inclined state along the axial direction with the supply side of the powdery raw material facing down.

  In the screen classifier, the cylindrical screen may be disposed in a state inclined by 3 to 10 ° with respect to the horizontal direction, and preferably may be disposed in a state inclined by 5 ° with respect to the horizontal direction.

  In addition, the screen classifier is attached to the casing containing the cylindrical screen and the rotor blades, and is connected to the one end side of the casing, which is the supply side of the powdery raw material, in communication with the inside of the cylindrical screen. A raw material supply case to which a raw material is supplied, and a sieve attached to the other end of the casing so as to communicate with the inside of the cylindrical screen, and out of the powdery raw material, powder coarser than the opening of the cylindrical screen is discharged. An upper product case, a fine powder outlet chute that is attached to the side of the casing so as to face the cylindrical screen, and into which the powder that has passed through the cylindrical screen is introduced, is arranged coaxially with the rotary blade in the raw material supply case A screw that rotates together with the rotor blades and feeds the powdery raw material in the raw material supply case into the cylindrical screen; Attached to ring, the bearing case for rotatably supporting the rotary shaft of the rotary blades, mounted on the bearing casing, a motor for rotationally driving the rotary shaft may be provided.

  Further, the screen classifier may be provided with an angle adjusting mechanism for arranging the cylindrical screen in an inclined state by making the casing inclined in the axial direction. In that case, the angle adjustment mechanism is provided to support the bearing case, a bracket plate attached to the bearing case, a top plate to which the bracket plate is rotatably attached, the bracket plate, A hinge for pivotally connecting the top plate, a pedestal to which the top plate is attached, and an elevating rod attached to the bracket plate via a spherical bearing, and moving the elevating rod in the axial direction Accordingly, the bracket plate may be rotated with respect to the top plate about the hinge to tilt the bearing case, and the casing may be tilted along the axial direction.

  According to the screen type classifier of the present invention, since the cylindrical screen is inclined upward along the axial direction with the raw material supply side down, the powdery raw material is compared with the case where the cylindrical screen is disposed horizontally. Can stay in the cylindrical screen. Thereby, it is possible to increase the chance that the powdery raw material is sieved by the cylindrical screen, improve the sieving efficiency, and increase the yield.

It is explanatory drawing which shows the whole structure of the inclination type screen classifier which is one embodiment of this invention, and has shown the state of no inclination (inclination angle 0 degree). It is explanatory drawing which shows the structure of the rotary blade used with the inclination type screen classifier of FIG. 1, (a) is an end view of a rotary blade, (b) has shown the twist of the blade, respectively. It is explanatory drawing which shows the structure of an angle adjustment mechanism, (a) is a right view, (b) is a front view of the state of inclination-angle 5 degrees.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is an explanatory diagram showing the overall configuration of an inclined screen classifier that is an embodiment of the present invention. As shown in FIG. 1, in a screen classifier 1 according to the present invention (hereinafter abbreviated as a classifier 1), a cylindrical screen 3 made of synthetic fiber woven mesh is accommodated in a cylindrical metal casing 2. ing. Inside the cylindrical screen 3, a rotary blade (rotor blade) 5 having a plurality of (here, three) blades 4 is disposed. A raw material supply case 6 is attached to one end side (raw material supply side) of the casing 2, and a sieve product case 7 is attached to the other end side (coarse powder discharge side).

  A fine powder outlet chute 8 is provided at the lower part of the casing 2 so as to face the cylindrical screen 3. The powdery raw material supplied from the raw material supply case 6 is dispersed and swirled by the rotating blades 5, and the finer powder than the opening of the cylindrical screen 3 is introduced into the fine powder outlet chute 8 through the mesh and discharged out of the apparatus. Is done. On the other hand, powder coarser than the opening of the cylindrical screen 3 is conveyed to the end of the casing 2 and discharged from the product case 7 on the sieve to the outside of the apparatus.

  The cylindrical screen 3 is formed of a synthetic fiber woven net, and as the net material, for example, nylon, polyester, polypropylene, fluororesin, or a material in which carbon fibers are woven into these is used. The cylindrical screen 3 has an axial length of about 125 to 400 mm and a diameter of about 100 to 500 mm. Moreover, although various things are used for the magnitude | size of a mesh depending on a to-be-processed object, it is about 10-3000 micrometers.

  At both ends of the cylindrical screen 3, annular metal mounting frames 11, 12 are attached. Cylindrical screen mounting portions 11a and 12a project in the axial direction on the mounting frames 11 and 12, and the cylindrical screen 3 is mounted on the screen mounting portions 11a and 12a with a metal fitting such as a band. The mounting frame 11 is mounted between the sieve product case 7 and the casing 2, and the mounting frame 12 is fitted to an annular portion 6 a provided in the raw material supply case 6. The cylindrical screen 3 is attached between the mounting frames 11 and 12 and is tensioned in the axial direction by the tension rod 13 so as not to contact the rotating blade 5 rotating inside. In addition, a blocking disc 14 is attached to the end of the cylindrical screen 3 on the coarse powder discharge side.

  As shown in FIG. 2, the rotary blade 5 has a configuration in which a plurality of blades 4 are radially attached to a rotary shaft 15. The blade 4 is attached with a slight twist angle with respect to the center line O of the rotating shaft 15. Further, a screw 16 is attached to the rotary shaft 15 coaxially with the rotary blade 5. The screw 16 is disposed in the raw material supply case 6. The rotating shaft 15 is supported by a bearing case 17 having a speed reduction mechanism (not shown), and is rotated by a motor 18. The bearing case 17 is placed on a gantry 19 provided with an angle adjustment mechanism 21. In the classifier 1, the angle adjustment mechanism 21 can incline and arrange the casing 2 (and the cylindrical screen 3) at an arbitrary angle θ between 0 ° and 15 °.

  As shown in FIG. 3, in the angle adjustment mechanism 21, the inclination of the casing 2 can be adjusted by a handle 22, and a top plate 23 attached to the upper end of the gantry 19 and a hinge 24 with respect to the top plate 23. A bracket plate 25 that is rotatably attached as a center is provided. The bracket plate 25 is fixed to the lower surface of the bearing case 17, and one end side thereof is supported by the hinge 24. A lifting rod 27 is attached to the other end side of the bracket plate 25 via a spherical bearing 26. A male screw portion is provided at the lower end of the elevating rod 27, and the elevating rod 27 is connected to the coupling 29 in such a manner that the male screw portion is screwed into the hexagon nut 28. The coupling 29 is attached to a gear box 30 fixed to the gantry 19. The gear box 30 accommodates a gear (bevel gear) (not shown), and a handle 22 is attached to the gear box 30.

  In the angle adjusting mechanism 21, when the handle 22 is turned, a shaft (not shown) extending in the vertical direction in the gear box 30 is rotated by meshing of the gears in the gear box 30. This shaft is connected to the coupling 29 by a parallel key, and the coupling 29 rotates simultaneously with the operation of the handle 22. The coupling 29 is provided with a female screw portion into which the male screw portion of the elevating rod 27 is screwed. When the coupling 29 rotates, the elevating rod 27 screwed with the female screw portion rotates in the axial direction (up and down). Direction). When the elevating rod 27 extends upward, the bracket plate 25 rotates about the hinge 24 and the outer end side of the bearing case 17 is lifted. As a result, the bearing case 17 is tilted and the casing 2 is also tilted at the same time, and the cylindrical screen 3 is also tilted. FIG. 3B shows a state where the casing 2 and the cylindrical screen 3 are inclined by 5 °.

  In such a classifier 1, the classification process is performed in a state where the casing 2 (and the cylindrical screen 3) is inclined by the angle adjustment mechanism 21. As shown in FIG. 1, at this time, the classifier 1 is inclined such that the sieved product case 7 is above the raw material supply case 6. The powdery raw material (sieving raw material) 31 is introduced into the apparatus from the raw material supply case 6 and fed into the cylindrical screen 3 from the raw material supply case 6 by the screw 16. The powdery raw material 31 that has entered the cylindrical screen 3 is agitated by the rotary blade 5, and swirls along the inner surface of the cylindrical screen 3, so that the product case 7 (coarse powder discharge side) ). At this time, the powdery raw material 31 accelerated by the blade 4 rotating at high speed is pressed against the inner surface of the cylindrical screen 3, and very fine vibration is generated on the screen surface before and after the blade 4.

  This minute vibration is caused by the elasticity of the screen and the centrifugal force applied to the powdery raw material as the rotary blade 5 rotates, and has a high frequency and a large acceleration. In the classifier 1, the high frequency vibration prevents clogging of the cylindrical screen 3, and sifts the fine particles 31 a smaller than the opening of the screen and discharges them from the fine powder outlet chute 8 to the outside of the machine. On the other hand, the coarse particles 31b larger than the openings pass between the inner diameter of the mounting frame 11 and the outer diameter of the blocking disc 14, and are discharged out of the machine through the sieve product case 7.

  On the other hand, in the classifier 1, the cylindrical screen 3 is inclined upward along the raw material feeding direction (axial direction) with the raw material supply side down. For this reason, the time during which the powdery raw material 31 stays in the cylindrical screen 3 becomes longer than when the cylindrical screen 3 is horizontally arranged. Thereby, the chance that the powdery raw material 31 is sieved by the cylindrical screen 3 increases, the sieving efficiency is improved, and the yield is increased. According to the experiment of the inventor, when the inorganic powder was classified with a polyester screen having an opening of 45 μm, the yield ratio under the sieve was 74% without inclination, but improved to 79% when the inclination was 5 °. Further, when the electronic material was classified by a polyester screen having an opening of 59 μm, the yield ratio under the sieve was 87% without the inclination, but improved to 94% when the inclination was 5 °.

  In addition, the classifier 1 has an inclination angle θ of about 5 °, and the powdery raw material 31 does not accumulate below the wet apparatus having a large inclination angle. For this reason, unlike the case where the wet apparatus is used for the dry process, the raw material does not fall into an unprocessable state and the screen is not damaged by the retained raw material.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
For example, the various numerical values such as dimensions and tension in the above-described embodiments are merely examples, and can be appropriately changed depending on the physique of the apparatus, the physical properties of the object to be processed, the specifications of the product, etc. There is no particular limitation.

DESCRIPTION OF SYMBOLS 1 Screen type classifier 2 Casing 3 Cylindrical screen 4 Blade 5 Rotary blade 6 Raw material supply case 6a Annular part 7 Sieve product case 8 Fine powder outlet chute 11 Mounting frame 11a Screen mounting part 12 Mounting frame 12a Screen mounting part 13 Tension rod 14 Shielding disc 15 Rotating shaft 16 Screw 17 Bearing case 18 Motor 19 Mounting base 21 Angle adjustment mechanism 22 Handle 23 Top plate 24 Hinge 25 Bracket plate 26 Spherical bearing 27 Lifting rod 28 Hex nut 29 Coupling 30 Gear box 31 Powdered raw material 31a Fine particles 31b Coarse grain O Center line θ Inclination angle

Claims (6)

A cylindrical screen formed of a synthetic fiber woven net;
A rotating blade that is disposed in the cylindrical screen and disperses and swirls the powdery raw material supplied in the cylindrical screen, and
By rotating the rotary blade, a dry-type screen classifier that sifts the powdery raw material finer than the opening of the cylindrical screen out of the cylindrical screen,
The dry screen type classifier characterized in that the cylindrical screen is arranged in an inclined state along the axial direction with the supply side of the powdery raw material facing down. In the screen classifier according to claim 1,
The dry type screen classifier, wherein the cylindrical screen is disposed in a state inclined by 3 to 10 ° with respect to a horizontal direction. In the screen classifier according to claim 1,
The dry type screen classifier, wherein the cylindrical screen is disposed at an angle of 5 ° with respect to a horizontal direction. In the screen type classifier according to any one of claims 1 to 3,
The screen classifier
A casing for housing the cylindrical screen and the rotor blades;
A raw material supply case that is attached in communication with the inside of the cylindrical screen to one end side that is the supply side of the powdery raw material of the casing, and that is supplied with the powdery raw material,
A product case on the sieve that is attached to the other end of the casing in communication with the inside of the cylindrical screen, and out of the powdery raw material, coarse powder is discharged from the openings of the cylindrical screen,
A fine powder outlet chute that is attached to the side of the casing facing the cylindrical screen and into which the powder that has passed through the cylindrical screen is introduced,
A screw arranged coaxially with the rotary blade in the raw material supply case, rotates together with the rotary blade, and feeds the powdery raw material in the raw material supply case into the cylindrical screen;
A bearing case attached to the casing and rotatably supporting a rotating shaft of the rotor blade;
A dry screen type classifier comprising: a motor attached to the bearing case and configured to rotate the rotary shaft. The screen type classifier according to claim 4,
The screen classifier further includes:
A dry screen classifier having an angle adjusting mechanism for arranging the cylindrical screen in an inclined state by making the casing inclined in the axial direction. The screen classifier according to claim 5,
The angle adjustment mechanism is provided to support the bearing case,
A bracket plate attached to the bearing case;
A top plate on which the bracket plate is rotatably mounted;
A hinge that rotatably connects the bracket plate and the top plate;
A mount to which the top plate is attached;
A lifting rod attached to the bracket plate via a spherical bearing,
By moving the lifting rod in the axial direction, the bracket plate is rotated about the hinge with respect to the top plate to tilt the bearing case, and the casing is tilted along the axial direction. Features a dry screen classifier.

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