JP6825070B1 - Cylindrical sieve classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical sieve classifying machine capable of effectively suppressing scattering of powder or granular material to be classified and easily switching cylindrical sieves. SOLUTION: A classification unit 1 having an introduction port 103 for introducing a powder or granular material to be treated and an outlet 102 for leading out the powder or granular material after classification, a powder or granular material supply unit for supplying the powder or granular material to be treated, and a classification. The classification unit 1 includes a drive unit 2 including a drive unit 23 having a drive shaft 21 for supplying rotational power to the unit 1, and the classification unit 1 includes a casing 10 having an introduction port 103 and an outlet 102 and a coarse particle collection unit 101. , The outer peripheral sieve 134, the cylindrical sieve 13 that communicates the inside with the introduction port 103 and divides the inside of the casing 10 into two on the introduction port side and the outlet side, the stirring blade 125, and the center line of the cylindrical sieve. The classification unit 1 is integrally detachable from the drive unit 2 and includes a stirring mechanism provided with a rotating shaft to which the stirring blade is fixed and the drive shaft is connected. [Selection diagram] Fig. 1

Description

The present invention relates to a cylindrical sieve classifier.

Conventionally, a classifier for classifying powders and granules using a cylindrical sieve whose outer circumference is formed of a sieve has been disclosed (Patent Documents 1, 2, etc.).

The cylindrical sieve classifier supplies the powder or granular material to the inside of the cylindrical screen, and collects the powder or granular material having a predetermined particle size or less that has passed through the cylindrical sieve from the outside of the cylindrical sieve to perform classification.

Japanese Unexamined Patent Publication No. 4-6970 Japanese Unexamined Patent Publication No. 10-286524

By the way, the classifier cleans the classifier when switching the powder or granular material when classifying a plurality of powder or granular material, when replacing the cylindrical sieve, or the like. When cleaning the cylinder, it is necessary to remove the cylindrical sieve from the classifier, which may cause problems such as powder particles adhering to the inside and outside of the cylindrical sieve leaking to the outside or being mixed into the powder particles after classification. There was a problem, and complicated operations were required to avoid it.

The present invention has been completed in view of the above circumstances, and it is an object to be solved to provide a cylindrical sieve classifying machine capable of easily switching cylindrical sieves.

As a result of diligent studies by the present inventor for the purpose of solving the above problems, the following inventions have been completed. That is, the cylindrical sieve classifier of the present invention has a classification unit having an introduction port for introducing the powder or granular material to be classified and an outlet for deriving the powder or granular material after classification after classification.
A drive unit including a powder or granular material supply unit for supplying the powder or granular material to be processed from a powder or granular material supply port fitted to the introduction port, and a drive source having a drive shaft for supplying rotational power to the classification unit. ,
Have,
The classification unit is
A casing in which the introduction port and the outlet are open and have a coarse grain collecting portion.
A cylindrical sieve having an outer peripheral sieve made of a sieve having a predetermined opening, the inside communicating with the introduction port, and the inside of the casing being divided into two on the introduction port, the coarse grain collecting portion side, and the outlet side. ,
A stirring mechanism having a stirring blade and a rotating shaft provided on the center line of the cylindrical sieve to which the stirring blade is fixed and the drive shaft is connected is provided.
The classification unit can be integrally detached from the drive unit.

The cylindrical sieve classifier of the present invention can be handled without exposing the cylindrical sieve by making the casing and the cylindrical sieve that divides the inside of the casing into two integrated and removable forms. As a result, it becomes possible to suppress the mixing of powders and granules before and after classification, and as a result, the switching operation of the cylindrical sieve can be easily performed.

It is the figure which separated the cylindrical sieve classifier of this embodiment into a classification unit 1 and a drive part 2. The drive unit 2 is a cross-sectional view. It is sectional drawing of the cylindrical sieve classifier of this embodiment. It is a perspective view of the classification unit 1 of the cylindrical sieve classification machine of this embodiment. It is a perspective view of the classification unit 1 of the cylindrical sieve classification machine of this embodiment. It is a front view of the cylindrical sieve classifier of this embodiment. FIG. 5 is a sectional view taken along line IV-IV of FIG. It is an exploded view of the classification unit 1 of the cylindrical sieve classifier of this embodiment.

The cylindrical sieve classifier of the present invention will be described in detail based on the embodiment with reference to the following drawings. The cylindrical sieve classifier of the present embodiment is an apparatus that continuously classifies the powder or granular material to be treated into the powder or granular material after classification. In particular, it can be suitably used for separating and removing coarse particles slightly contained in the powder or granular material to be treated.

(Constitution)
As shown in FIGS. 1 and 2, the cylindrical sieve classifier of the present embodiment has a classifying unit 1 and a driving unit 2. As shown in FIGS. 1 to 7, the classification unit 1 has a casing 10, a cylindrical sieve 13, and a stirring mechanism 12. The portion of the device in contact with the powder or granular material is made of resin. For example, in the cylindrical sieve classifier of the present embodiment, the drive shaft 21 covered with the shaft body 123, the drive means 23 not designed to be in contact with the powder or granular material, the rotary blade drive unit 24, the screws, and the like are basically excluded. It is composed of resin. The resin is not particularly limited, but general-purpose resins such as polyethylene, polypropylene, and polyethylene terephthalate resin can be used. Further, a reinforcing material such as carbon fiber or glass fiber can also be used.

When referring to the classification unit 1, unless otherwise specified, the "length" is the axial length of the cylinder, which is the form of a cylindrical sieve, and the "outer diameter" is the radial length of the cylinder. Is. Further, the F direction in FIG. 1 is the tip direction.

The casing 10 has a cylindrical casing main body 10a that opens at one end A, and a fitting lid 10b whose periphery is closely fitted to one end A of the casing main body 10a. The inside of the casing 10 is divided into two by a cylindrical sieve 13 described later, and by migrating from one of those compartments to the other, the powder or granular material to be treated is transferred to the outer peripheral sieve 134 (described only in FIG. 6; the other drawing). Then, the description is omitted) and the classification is completed.

In the casing main body 10a, the outlet 102 opens on the side surface of the cylinder. The outlet 102 is arranged so as to open downward during use, and is not located directly below the powder introduction port 103 described later. Since the powder or granular material to be treated containing coarse particles is supplied to the introduction port 103, if the powder or granular material to be treated is spilled from the introduction port 103 by an operation, the outlet 102 is not arranged so that the outlet 102 is not arranged. It is possible to prevent contamination of the powder or granular material to be treated with the powder or granular material after classification derived from. A substantially cylindrical coarse grain collecting portion 101 is provided at the other end of the casing main body 10a.

The coarse grain collecting unit 101 is a space for storing coarse grains classified by the outer peripheral sieve 134. The size of the coarse grain collecting portion 101 has an outer diameter smaller than the outer diameter of the casing main body 10a. The coarse grain recovery unit 101 is provided with a compressed air introduction port 101a and a coarse grain discharge port 101b that are closed by a closing member (not shown) at the time of classification, and compressed air is introduced from the compressed air introduction port 101a at the time of cleaning. At the same time, air is sucked from the coarse particle discharge port 101b to form an air flow inside, and the coarse particles stored inside are collected on the air flow.

The fitting lid 10b is a disk-shaped member having a diameter slightly larger than the outer shape of one end A of the casing main body 10a, and a circular introduction port 103 opens in the center. The fitting lid 10b has a fitting convex portion 10b1 which is a disk-shaped convex portion having a size of fitting to one end A of the casing main body 10a without a gap, and a disk shape having a diameter slightly smaller than the fitting convex portion 10b1. It has a cylindrical sieve holding portion 10b2 of.

The outer diameter of the cylindrical sieve holding portion 10b2 is the same as the outer diameter of the outer peripheral sieve 134. Roughly speaking, the shape of the fitting lid 10b on the side to be fitted to the casing body 10a has an outer shape in which three disc-shaped members having different diameters are concentrically integrated in the order of the diameter, and the casing body 10a has an outer shape. The shape on the side opposite to the fitting side is a member having a recess 104 into which the convex portion 222 of the drive portion, which will be described later, can be fitted without a gap, and a circular introduction port 103 is formed in the center.

The cylindrical sieve 13 has an outer peripheral sieve 134 (shown only in FIG. 6), a cylindrical sieve holding portion 10b2, and a spacer 132, and divides the inside of the casing 10 into two regions. The cylindrical sieve 13 is fixed to the fitting lid 10b. The cylindrical sieve 13 has an outer peripheral sieve 134 formed in a cylindrical shape, and one end of the outer peripheral sieve 134 is held by the cylindrical sieve holding portion 10b2 of the fitting lid 10b without a gap. The other end is held tightly by the cylindrical sieve holding ring 131 that is in close contact with the inner wall of the casing body 10a.

The cylindrical sieve holding ring 131 has an outer diameter substantially the same as the inner diameter of the annular flange portion 131a larger than the outer diameter of the outer peripheral sieve 134 and the other end of the outer peripheral sieve 134, and the inner circumference of the other end of the cylindrical sieve 13 is fitted without a gap. It has a fitting portion 131b having an outer peripheral surface that can be fitted.

The cylindrical sieve holding ring 131 is fixed to the fitting lid 10b via three rod-shaped spacers 132 fixed to the flange portion 131a. The arrangement of the spacer 132 is fixed to the flange 131a of the cylindrical sieve holding ring 131 at 120 ° intervals. The length of the spacer 132 is the same as the length of the cylindrical sieve 13.

The flange portion 131a of the cylindrical sieve holding ring 131 is in close contact with the inner wall of the casing main body 10a (around the periphery where the coarse grain collecting portion 101 is formed) without a gap. That is, the length of the casing main body 10a excluding the coarse grain collecting portion 101 is substantially the same as the length of the cylindrical sieve 13.

The stirring mechanism 12 is a member arranged inside the cylindrical sieve 13, is connected to the tip end portion of the drive shaft 21 included in the drive unit 2 described later, and rotates with the rotation of the drive shaft 21.

The stirring mechanism 12 is fixed in parallel to both ends of the shaft body 123 and the shaft body 123, and consists of six triangular combinations of truss-shaped hexagonal plates 121 and 122, and hexagonal plates 121 and 122, respectively. It has six substantially rectangular stirring blades 125 (shown only in FIG. 6) arranged to connect the corresponding vertices of the hexagon. These stirring blades 125 form a screw feeder by forming a twist that can urge the powder or granular material to be processed in the tip direction as the stirring mechanism 12 rotates. It is preferable that the urging speed of the powder or granular material to be treated in the tip direction is sufficiently slower than the stirring speed by the stirring mechanism 12 because the classification can proceed sufficiently.

The shaft body 123 has a hollow center, and the drive shaft 21 is inserted and fixed in the hollow. A partition plate 124 is fixed to the most advanced portion of the shaft body 123. The partition plate 124 is a disk-shaped member having an outer diameter slightly smaller than the inner diameter of the coarse grain collecting portion 101 in the casing main body 10a, and is sealed by forming a slight gap with the inner wall of the coarse grain collecting portion 101. It is a position that can be done. The partition plate 124 divides the inside of the casing 10 into a coarse grain collecting portion 101 and other parts.

A handling handle 14 provided for easy operation when the classification unit 1 is removed from the drive unit 2 is fixed to the casing 10. The handling handle 14 has an annular stay 141 having an inner diameter slightly larger than the outer diameter of the coarse grain collecting portion 101 and having substantially the same outer diameter as the cylindrical sieve holding ring 131, and two handles 142 fixed to the stay 141. , 143 and. The stay 141 is provided with mounting holes at 120 ° intervals (at the same position as the cylindrical sieve holding ring 131), and is fixed by fastening means (screws) for fixing the cylindrical sieve holding ring 131.

The drive unit 2 is a means for transmitting a driving force to the classification unit 1 and supplying the powder or granular material to be processed from the powder or granular material supply port 222a. The drive unit 2 includes a powder or granular material supply unit (drive unit housing 22) and a drive source (drive shaft 21 and drive means 23). The drive unit 2 can be arranged at an arbitrary height. Since the powder or granular material after classification derived from the classification unit 1 is discharged by gravity, it is preferable to arrange the powder or granular material below the classification unit 1 so as to have a sufficient margin. The drive shaft 21 has a tapered shape, and the tip portion has a detent (not shown) that engages with the shaft body 123 of the stirring mechanism 12. Although the shaft body 123 and the drive shaft 21 are engaged with each other so as not to rotate relative to each other, they can move freely in the axial direction (length direction).

The drive unit housing 22 partitions the powder or granular material flow path 22a to be processed, which communicates from the powder or granular material introduction port 221a opening at the upper part to the powder or granular material supply port 222a. Basically, the powder or granular material to be treated is supplied by naturally moving from the powder or granular material introduction port 221a to the powder or granular material supply port 222a by gravity.

The powder or granular material to be treated is introduced into the powder or granular material introduction port 221a by an appropriate method. In the present embodiment, the outlet (not shown) of the powder or granular material manufacturing process, which is the previous step, is connected to the powder or granular material introduction port connection portion 221. A rotary blade 241 driven by the rotary blade drive unit 24 is arranged in the middle of the powder or granular material flow path 22a to be processed. The rotation of the rotary blade 241 eliminates the clogging of the powder or granular material to be processed in the powder or granular material flow path 22a to be processed.

Since the powder or granular material supply port 222a opens in the lateral direction, the powder or granular material to be processed may not be sufficiently moved by gravity alone, so that the screw 21b is arranged coaxially with the drive shaft 21. The screw 21b is provided so as to urge the powder or granular material to be processed in the direction of leading out from the powder or granular material supply port 222a by the rotation of the drive shaft 21. The powder or granular material supply port 222a is provided on the convex portion 222 of the drive portion, and the outer shape of the convex portion 222 of the drive portion is cylindrical. A fixing means (not shown: swing clamp) for fixing the fitting lid 10b is provided around the convex portion 222 of the drive portion.

(Action effect)
-Example of assembly and explanation of classification operation The fitting lid 10b is fitted to the convex portion 222 of the driving portion of the driving portion 2. The fitting lid 10b is fixed to the drive unit 2 with a swing clamp. A cylindrical sieve 13 is fixed to the fitting lid 10b in advance. The drive shaft 21 protruding from the center of the powder supply port 222a is inserted into the casing main body 10a from the introduction port 103 of the fitting lid 10b. The stirring mechanism 12 is fixed to the drive shaft 21. Specifically, the drive shaft 21 is inserted and fixed in the shaft body 123.

Next, one end A of the casing body 10a is fitted with the fitting lid 10b. At that time, the tip of the screw for fixing the spacer 132 of the cylindrical sieve 13 protrudes from the casing main body 10a, and the handling handle 14 is fixed by using the protruding portion.

A device for supplying the powder or granular material to be processed is connected to the powder or granular material introduction port 221a of the drive unit 2, and a means (not shown) for storing the powder or granular material after classification is connected to the outlet 102 of the casing 10. Ru.

When the cylindrical sieve classifier of the present embodiment is operated in this state, the powder or granular material to be treated introduced from the powder or granular material introduction port 221a of the drive unit 2 passes through the inside of the drive unit housing 22 and the powder or granular material supply port. Derived from 222a. At this time, the rotor blades 241 are operated so as not to be clogged in the drive unit housing 22. Then, it is urged by the screw 21b so as to be reliably derived from the powder or granular material supply port 222a. The screw 21b is rotated as the drive shaft 21 rotates.

The powder or granular material to be treated introduced from the introduction port 103 of the classification unit 1 moves to the inside of the cylindrical sieve 13 in the internal space of the casing 10. Therefore, it is urged outward (in the direction of the sieve) by being stirred by the stirring mechanism 12. As a result, powder or granular material having a particle size smaller than the opening of the cylindrical sieve 13 passes through the cylindrical sieve 13. The powder or granular material (powder or granular material after classification) that has passed through the cylindrical sieve 13 moves to the outside of the cylindrical sieve 13 in the internal space of the casing 10 and is led out from the outlet 102.

The powder or granular material to be treated in the cylindrical sieve 13 is gradually moved toward the tip by the stirring mechanism 12. The powder or granular material that cannot pass through the cylindrical sieve 13 even if it moves to the partition plate 124 is collected as a powder or granular material (coarse grain) having a particle size larger than the opening from the gap between the partition plate 124 and the casing 10. Collected in part 101. The coarse particles collected by the coarse grain collecting unit 101 are prevented from flowing back due to the presence of the partition plate 124. Then, the stirring mechanism 12 is prevented from being detached from the drive shaft 21 by the reaction force in which the powder or granular material to be treated is urged toward the tip end.

The classification speed and the classification efficiency can be adjusted by adjusting the degree of urging in the tip direction by the stirring mechanism 12 and the stirring speed. The higher the stirring speed, the higher the classification speed. However, if the stirring speed is increased, it is expected that the energy and noise required for classification will be relatively large, and the wear of the classifying machine will be large. When the degree of urging in the tip direction becomes large, it will be collected as coarse grains in the coarse grain collecting unit 101 relatively early, and conversely, if the degree of urging is small, the coarse grains will be sufficiently classified and then coarse grains will be collected. Since it is collected by the collection unit 101, the classification efficiency is high, but the classification speed is low.

-When disassembly and cleaning progresses and the coarse grain collecting unit 101 becomes full, or when another class to be processed is classified, it is necessary to perform a switching operation of the classifying unit 1. As a method for dealing with the case where the inside of the coarse grain recovery unit 101 is full, coarse grains can be taken out from the coarse grain recovery unit 101. Coarse grains can be taken out by sucking air from the coarse grain discharge port 101b at the same speed while introducing compressed air from the compressed air introduction port 101a after removing the closing member.

The particle size of the classification unit 1 that can be classified can be changed by replacing the outer peripheral sieve 134 of the cylindrical sieve 13 of the classification unit 1, but the entire classification unit 1 is used to clean the part in contact with the powder or granular material such as the inside of the casing 10. Needs to be cleaned or replaced, for which the classification unit 1 needs to be disassembled.

By removing the classification unit 1 from the drive unit 2 prior to the disassembly of the classification unit 1, scattering of powder or granular material remaining in the classification unit 1 is suppressed. After removing the swing clamp that fixes the fitting lid 10b, the classification unit 1 can be integrally detached by grasping the handling handle 14 and pulling it toward the tip of the drive shaft 21. Leakage of powder or granular material after classification from the outlet 102 can be suppressed by closing the outlet 102 before the classification unit 1 is detached.

When the powder or granular material to be processed leaks from the introduction port 103, the stirring mechanism 12 in contact with the powder or granular material to be processed remains in the classification unit 1, and a force is applied to the classification unit 1 in the direction in which the drive shaft 21 is disengaged. In addition, since the opening direction of the introduction port 103 is the horizontal direction, there is a low possibility that the powder or granular material to be treated leaks to the outside as it moves.

By preparing another classification unit 1 in advance when disassembling / cleaning, the next classification operation can be performed without waiting for the disassembly / cleaning of the classification unit 1.

1 ... Classification unit 10 ... Casing 10a ... Casing body 10b ... Fitting lid 101 ... Coarse grain collection unit 102 ... Outlet port 103 ... Introduction port 12 ... Stirring mechanism 13 ... Cylindrical sieve 14 ... Handling handle 2 ... Drive unit 21 ... Drive shaft

Claims (6)

A classification unit having an introduction port for introducing the powder or granular material to be classified and an outlet for deriving the powder or granular material after classification after classification,
A drive unit including a powder or granular material supply unit for supplying the powder or granular material to be processed from a powder or granular material supply port fitted to the introduction port, and a drive source having a drive shaft for supplying rotational power to the classification unit. ,
Have,
The classification unit is
A casing in which the introduction port and the outlet are open and have a coarse grain collecting portion.
A cylindrical sieve having an outer peripheral sieve made of a sieve having a predetermined opening, the inside communicating with the introduction port, and the inside of the casing being divided into two on the introduction port, the coarse grain collecting portion side, and the outlet side. ,
A stirring mechanism having a stirring blade and a rotating shaft provided on the center line of the cylindrical sieve to which the stirring blade is fixed and the drive shaft is connected is provided.
The classification unit is a cylindrical sieve classifier that can be integrally detached from the drive unit. The cylindrical sieve has an outer diameter in which a slight gap is formed between the inner surface of the outer peripheral sieve, and has a partition plate that divides the internal space of the casing into a coarse grain collecting portion and other portions.
The stirring mechanism has a screw feeder that urges the powder or granular material to be processed in the cylindrical sieve toward the partition plate.
The cylindrical sieve classifying machine according to claim 1. The coarse grain recovery unit closes the compressed air introduction port for introducing compressed air, the coarse grain discharge port for discharging coarse particles in the coarse grain recovery unit, the compressed air introduction port, and the coarse grain discharge port, respectively. The cylindrical sieve classifier according to claim 1 or 2, which has a closing member. The cylindrical sieve classifying machine according to any one of claims 1 to 3, wherein the casing, the cylindrical sieve, the powder or granular material to be treated of the stirring blade, and the portion of the stirring blade that comes into contact with the powder or granular material after classification are made of resin. .. The cylindrical sieve classifier according to any one of claims 1 to 4, wherein the rotational power is supplied to the rotary shaft through the introduction port. The cylindrical sieve classifier according to any one of claims 1 to 5, wherein the position of the outlet is not directly below the introduction port of the casing.