JP2009125733A - Sieve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sieve unit having no clearance between a sieve wire netting and a hook causing contamination with impurities in a hook of a sieve unit of a vibrating sieve apparatus to be used for a field of classifying or sieving powder. <P>SOLUTION: The hook 2 is formed by inserting the sieve wire netting 1 and an inner plate 7 thinner than an outer plate into the outer plate 6 bent in a J shape, fixing the inserted part by spot welding, and bending the outer plate, the sieve wire netting, and the inner plate united together in a V shape so that the inner plate comes inside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a sieving unit and a vibration sieving device used in various industrial fields for a powder classification process or a sorting process. In the description of the present invention, the “sieving unit” is a unit for exchanging a vibration sieving device, which is obtained by cutting a sieve wire mesh or the like into a predetermined shape, and covering the necessary part of its periphery with an engaging member and molding it. Thus, it is easy to attach to a predetermined vibration sieving device, and the replacement operation can be performed quickly.

The vibration sieving device is a device that causes a group of particles to flow by vibration on a sieving wire mesh with a predetermined opening, and matches each particle with the mesh of the sieving wire mesh and selects them according to the particle diameter. Sieve units attached to industrial vibration sieving devices are consumables, and various attachment methods have been proposed in the past to make them convenient for use and replacement. The hook and the attachment frame body of the vibration sieving device are provided with engaging members to be engaged with each other to facilitate the attachment, replacement, and tension adjustment of the sieving wire mesh. Since the hook transmits the vibration from the vibrator to the sieve wire mesh without being attenuated, it is necessary to apply a sufficient tension to the sieve wire mesh and fix it.

In order to understand the entire sieve wire mesh attaching means, FIG. 8 shows a plan view of the sieve unit, and FIG. 9 shows an A-A ′ cross section of the drawing. DESCRIPTION OF SYMBOLS 1 is a sieve wire mesh, 2 is a hook formed in the both sides of a sieve wire mesh, 4 is an attachment frame of a vibration sieving device, 3 is a tension fitting attached to the attachment frame to be engaged with the hook, and 16 is an attachment frame A sieve wire mesh tension adjusting mechanism (in this example, a tension bolt) attached to the body 4. In this attachment means, the hook 2 attached to the both side edges of the sieving wire mesh 1 and the tension fitting 3 are engaged with each other in a slightly smaller width than the attachment frame 4 in consideration of the tension allowance for applying tension. The tension bolt 16 passed between the tension fitting 3 and the attachment frame 4 is adjusted to adjust the tension of the sieve wire mesh 1.

Next, a general structure of a hook conventionally used is shown in FIG. The hook 22 shown in FIG. 10 is a hook plate 26 that covers the edge portion of the sieve mesh 1. One plate is bent in a U shape along the length direction, sandwiched by the sieve mesh 1, and further vibrated along the edge. It is bent into a “<” shape with an appropriate width to be engaged with the tension fitting of the sieving device (Patent Document 1). As a result, a large gap 9 is formed between the outer end portion 26-1 of the hook plate and the distal end portion of the inner portion 26-2 of the hook plate for the reasons described later. In the case of molding as shown in FIG. 10 using a single plate as in the prior art, it is impossible to avoid the formation of this gap.
: JP 2006-26564

As described above, in the prior art, the gap 9 is generated between the sieve wire mesh 1 and the hook 22. As a result, part of the treated powder may enter the gap and remain there during the sieving process. Thereafter, when the type of the processed powder is changed, the processed powder remaining in the gap is detached by vibration, which may adversely affect the quality and product loss.

The present invention develops a sieving unit that suppresses a gap between a sieving wire mesh and a hook (engagement member) and a vibration sieving device using the sieving unit in order to eliminate the gap that is a problem in these sieving steps. .

In the present invention, in order to eliminate the gap, which is a problem of the above-described prior art, an inner plate thinner than the outer plate and a screen metal mesh are inserted into the outer plate bent into a J-shape, and the inserted portion is spot-welded. The fixed outer plate, sieve wire mesh, and inner plate are folded into a "<" shape so that the inner plate is inside,

Insert a sieve wire mesh and rubber sheet and an inner plate thinner than the outer plate into the outer plate folded in J-shape, and fix the insertion part by spot welding, and the integrated outer plate, sieve wire mesh and inner plate Is folded in a “ku” shape so that the inner plate is on the inside,

Inserting an inner plate and a porous plate thinner than the outer plate into the outer plate bent into a J-shape, fixing the insertion portion by spot welding, and integrating the outer plate, the porous plate and the inner plate, Folded into a “K” shape so that the inner plate is on the inside,

Inserting a porous plate, rubber sheet, and inner plate thinner than the outer plate into the outer plate bent in a J-shape, and fixing the insertion portion by spot welding, and the integrated outer plate, porous plate, and inner plate By adopting such a method that the inner plate is bent in a “<” shape so that the inner plate is on the inside, the gap that was a problem of the prior art can be made almost zero.

In addition to spot welding, the present invention is similarly applied to a sieving unit in which a sieve wire mesh or a perforated plate and an outer plate and an inner plate are fixed by a physical fixing method such as riveting, argon welding, seam welding, and adhesive. It is obvious that it is possible.

As a result of various studies to eliminate the gap at the tip, the following has been found.
A) When a plate is bent with the same radius of curvature, the amount of springback varies between thick and thin plates, and the thinner the plate, the greater the amount of springback.
B) If the plate thickness and bending angle are the same, the larger the radius of curvature, the greater the amount of springback. Therefore, the hook (engagement member) used in the conventional sieve unit is divided into two members with different thicknesses. The following effects were obtained by placing an inner plate that is thinner than the outer plate on the inside of the hook, and fixing the portion where the sieve mesh and inner plate were inserted into the outer plate by spot welding or the like.
1) According to the present invention, the gap between the sieve wire mesh and the outer plate and the inner plate can be made extremely small. As a result, the amount of powder entering through the gap 9 formed between them can be reduced, and the possibility that the powder will be separated by vibration after switching the type of treated powder can be reduced. 2) Sieve wire mesh from hook 3) Uniform tension can be applied to the screen and the screen can be screened uniformly over the screen.

An example of the present invention is shown in FIG. Insert the sieve mesh 1 and the inner plate 7 thinner than the outer plate into the outer plate 6 bent into a J-shape, crush the inserted portion with a press as shown in FIG. As shown in FIG. 3, the integrated outer plate, sieve wire mesh, and inner plate are formed into a "<" shape so that the inner plate is on the inside using a press upper die 31 and a press lower die 32 as shown in FIG. A folded hook 2 is configured.

Another example of the present invention is shown in FIG. A sieve mesh 1, a rubber sheet 11, and an inner plate 7 thinner than the outer plate are inserted into the outer plate 6 bent into a J-shape, and the inserted portion is crushed with a press as shown in FIG. The integrated outer plate and sieve wire mesh, rubber sheet and inner plate are fixed to each other using a press upper die 31 and a lower press die 32 so that the inner plate is on the inside. The hook 2 is bent into two. At this time, it is necessary to cut out the rubber sheet of the portion to be spot welded before insertion.

Another example of the present invention is shown in FIG. A porous plate 12 and an inner plate 7 thinner than the outer plate are inserted into the outer plate 6 bent into a J-shape, and the inserted portion is crushed with a press and then fixed by spot welding 8 to form an integrated outer plate. The hook 2 is formed by bending the perforated plate and the inner plate into a “<” shape using the upper die 31 and the lower die 32 so that the inner plate is inside. The material of the perforated plate includes materials other than metal such as rubber.

Another example of the present invention is shown in FIG. The porous plate 12, the rubber sheet 11, and the inner plate 7 thinner than the outer plate are inserted into the outer plate 6 bent into a J-shape, and the inserted portion is crushed with a press and fixed by spot welding 8, The hook 2 is formed by bending the outer plate, the perforated plate, the rubber sheet, and the inner plate into a “<” shape using the upper die 31 and the lower die 32 so that the inner plate is inside. It is configured. At this time, it is necessary to cut out the rubber sheet of the portion to be spot welded before insertion. The material of the perforated plate includes materials other than metal such as rubber.

The details of an example of the combination of the outer plate and the inner plate obtained in the present invention are as follows. The outer plate 6 is made of a strip stainless steel (SUS304) having a thickness of 1.5 mm and the inner plate 7 is made of 0.8 mm. By doing so, the gap 9 became almost zero. Since the amount of springback varies depending on the material of the outer plate and inner plate, the shape of the mold, and the bending conditions, it is desirable to find the optimum value for the combination of plate thickness by trial manufacture. Further, it is practically desirable to manufacture the plate thickness in the range of 1.0 to 3.0 mm for the outer plate and 0.3 to 1.0 mm for the inner plate.

In addition, as a technique for suppressing gaps and squeezing metal nets from the past, it has been used in the sieving unit to fix the hook plate 26 and the sieve metal net 1 by riveting or spot welding near the gap 9. There was a case where tension was concentrated on the fixed portion, and early breakage and uneven tension were problematic. However, in the present invention, the hook insertion portion is fixed by spot welding 8, so that the sieve wire mesh is prevented from coming out and the tension applied to the wire mesh is received by the portion folded in the shape of "<", so that the sieve wire mesh is uniform. Tension can be applied. In addition to the spot welding, the same effect can be expected by a physical fixing method such as riveting, argon welding, seam welding, or adhesive as well as spot welding.

FIG. 11 shows an example of a tensile test result of the sieve unit of the present invention, the conventional rivet fixed wire mesh unit, and the sieve wire mesh itself. The strength of the sieving unit of the present invention is closer to the strength of the sieving wire mesh itself, and a higher tension than that of the conventional sieving wire mesh can be applied. Therefore, the life of the sieving wire mesh can be expected to be extended. Furthermore, since uniform tension is applied to the sieving wire mesh, it is possible to prevent a reduction in screening efficiency due to non-uniform tension.

In recent various manufacturing processes, the ratio of high-mix, small-volume, and high-quality production has increased, and the substances to be screened have been frequently replaced, and it has become increasingly difficult to mix impurities. For this reason, gaps and dead spaces in the apparatus that cause impurities to be mixed must be minimized. Since the sieving unit of the present invention and the vibration sieving apparatus using the sieving unit have very small gaps and dead spaces, they are particularly suitable for manufacturing processes of fine chemical products.

Illustrative illustration of hooks of the present sieve unit Example of production of hook according to the present invention Example of production of hook according to the present invention Other embodiments of the present invention Example of production of hook according to the present invention Other embodiments of the present invention Other embodiments of the present invention Top view of sieve unit Sieve unit A-A cross section (attached state) Illustration of a conventional hook Tensile test results of the present sieve unit, conventional rivet fixed wire mesh unit, and sieve mesh itself

Explanation of symbols

1: Sieve wire mesh 2, 22: Hook 3: Tensile bracket 4: Mounting frame 5: Sieve unit 6: Outer plate 7: Inner plate 8: Spot welding 9: Gap 11: Rubber sheet 12: Perforated plate 16: Wire mesh tension adjustment Mechanism (tensile bolt)
26: Hook plate 31: Upper die 32: Lower die

Claims (6)

A sieving unit that is fixed to the mounting frame by engaging with the tension fitting of the vibration sieving device via the hook of the sieving wire mesh, and the inner plate and the sieving wire mesh that are thinner than the outer plate are folded into a J-shaped outer plate. And the insertion portion is fixed by spot welding, and the integrated outer plate, sieve wire mesh, and inner plate are folded into a "<" shape so that the inner plate is inside. Sieve unit with hook. 2. The sieving unit according to claim 1, wherein an inner plate, a sieving wire mesh, and a rubber sheet thinner than the outer plate are inserted into a J-shaped outer plate. Inserting an inner plate and a porous plate thinner than the outer plate into the outer plate bent into a J-shape, fixing the insertion portion by spot welding, and integrating the outer plate, the porous plate and the inner plate, A sieving unit having a hook, wherein the inner plate is bent in a “<” shape so that it is on the inside. The sieving unit according to claim 3, wherein an inner plate, a porous plate, and a rubber sheet thinner than the outer plate are inserted into the outer plate bent in a J-shape. The sieve metal mesh or the perforated plate and the outer plate and the inner plate are fixed by a physical fixing method instead of spot welding such as riveting, argon welding, seam welding, and adhesive. Sieve unit. 6. A vibration sieving apparatus equipped with a sieving unit corresponding to one or more of claims 1 to 5.

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